now , embodiments of a plastic container of the first invention will be described in detail below with reference to the accompanying drawings . [ 0085 ] fig1 illustrates an embodiment of the first invention , in which its plastic container is used as a container for ground coffee beans or powdery coffee ( hereinafter referred to as the “ coffee - container ”). the coffee - container 10 is composed of a main body 11 that is formed of a plastic laminate film into a tubular shape , an upper - formed member 12 that is integrally formed with the outer surface of one end of the main body 11 and a lower - formed member 13 that is integrally formed with the inner surface of the other end of the main body 11 . the upper - formed member 12 is formed into a tubular shape , which is provided with an upper opening end having an inside diameter r 1 . the upper - formed member 12 is provided on the outer surface of its upper portion with a threaded portion 14 and on the outer surface of its lower portion with a grip portion 15 . the upper opening end of the upper - formed member 12 is sealed with a cover member . a cap ( not shown ) is screwed on the threaded portion 14 of the upper - formed member 12 . the lower - formed member 13 is formed into a tubular shape with a bottom having an outside diameter r 2 . the outside diameter r 2 of the lower - formed member 13 is designed to be smaller than the inside diameter ri of the upper - formed member 12 . more specifically , the upper - formed member 12 serves as the large - diameter - formed member and the lower - formed member 13 serves as the small - diameter - formed member . the main body 11 has the tubular shape with the opposite opening ends . it can be obtained by cutting a plastic laminate film into a rectangular shape to form a sheet material and then joining the outer surface of one side edge of the thus formed sheet material with the inner surface of the other side edge thereof . for the preparation of the main body 11 , there may be adopted a different process of joining the inner surface of the one side edge of the sheet material with the inner surface of the other side edge thereof ( hereinafter referred to as the “ first optional joining process ”). there may be adopted another different process of placing the outer surface of the one side edge of the sheet material with the inner surface of the other side edge thereof and joining them with the use of an adhesive tape applied from the inside of the main body ( hereinafter referred to as the “ second optional joining process ”). in view of an excellent moisture - proof property and an excellent gas isolating property , there may suitably be used as the above - mentioned plastic laminate film ( i ) a laminate of a polyethylene film having a thickness of 70 μm , a polyester film having a thickness of 12 μm , an aluminum foil having a thickness of 12 μm and a polyethylene film having a thickness of 70 μm , ( ii ) a laminate of a cast polypropylene having a thickness of 70 μm , a polyester film having a thickness of 12 μm , an aluminum foil having a thickness of 12 μm and a cast polypropylene having a thickness of 70 μm or ( iii ) a laminate of a cast polypropylene having a thickness of 70 μm , a polyester film having a thickness of 12 μm and a cast polypropylene having a thickness of 70 μm . when the aluminum film is substituted by a film of ethylene - vinylalcohol copolymer or a silica - deposited film , it is possible to make the main body transparent , while maintaining the excellent moisture - proof property and gas isolating property . the contents received in the container can visually be observed from the outside thereof . when the main body 11 for the coffee - container 10 is formed of the plastic laminate film including the aluminum foil , it is preferable to adopt the first or second optional joining process described above . when the contents to be received in the container is liquid such as fruit juice drink , which has a ph value of up to 4 , it is preferable to adopt the second optional joining process for the formation of the main body 11 in order to prevent the aluminum foil from being oxidized to cause elution of aluminum in the liquid . when the main body 11 for the coffee - container 10 is formed of the plastic laminate film including no aluminum foil , it is preferable to adopt the first or second optional joining process for the formation of the main body 11 in order to prevent the adhesive used in the lamination process from being eluted into the contents received in the container . now , description will be given below of the method for manufacturing the coffee - container 10 . the moisture of ground coffee beans or powdery coffee should be decreased as small as possible and the good aroma thereof should be maintained . accordingly , the coffee - container 10 is required to have the excellent moisture - proof property and the excellent gas isolating property . for these reasons , the plastic laminate film having these excellent properties is selected to be used for the formation of the main body 11 for the coffee - container 10 . a mold 20 for the formation of the coffee - container 10 has the first cavity 21 for forming the large - diameter - formed member and the second cavity 22 for forming the small - diameter - formed member as shown in fig2 . the first cavity 21 and the second cavity 22 are spaced from each other at a distance corresponding to the dimensions of the main body 11 . the first cavity 21 has an inside diameter , which is larger than the outside diameter of the second cavity 22 . the first cavity 21 of the mold has a shape corresponding to the upper - formed member 12 of the above - described coffee - container 10 . the second cavity 22 of the mold has a shape corresponding to the lower - formed member 13 thereof . the lower - formed member 13 , which is formed by the second cavity 22 , has a bottom that provides the excellent moisture - proof property and the excellent gas isolating property . the main body 11 is formed into a tubular shape of the plastic laminate film having the excellent moisture - proof property and the excellent gas isolating property . the thus formed main tubular body 11 is put on the outer surface of a mandrel 23 , which serves as a core for the mold . when the main tubular body 11 has a circular cross section , the mandrel 23 also has the corresponding circular cross section . when the main tubular body 11 has a rectangular cross section , the mandrel 23 also has , on the other hand , the corresponding rectangular cross section . then , the mandrel 23 on which the main tubular body 11 has been put , is placed in the mold 20 so that the end of the main tubular body 111 locates inside the first cavity 21 and the other end thereof locates outside the second cavity 22 . the mandrel 23 , on which the main tubular body 11 has been put , can smoothly be inserted into the mold 20 due to the fact that the inside diameter of the first cavity 21 of the mold 20 is larger than the outside diameter of the second cavity 22 thereof . after the completion of the placement of the mandrel 23 on which the main tubular body 11 is put , in the mold 20 , synthetic resin material such as polyethylene resin is injected in a molten state into the first cavity 21 and the second cavity 22 of the mold 20 from a gate 25 formed therein through a runner 24 by means of an insert - injection process . in this case , even when the lower end of the main tubular body 11 reaches the bottom of the second cavity 22 ad shown in fig3 an injection pressure of the molten synthetic resin material is applied in directions that are indicated by arrows in fig3 during the insert - injection process . consequently , wrinkles does not occur at the end of the main tubular body 11 or the end of the main tubular body 11 is not turned up , irrespective of the injection pressure of the molten synthetic resin material . after the completion of a cooling process which is applied to the molten synthetic resin material injected into the first cavity 21 and the second cavity 22 , the formation of the coffee - container 10 in which the upper - formed member 12 is integrally formed with the outer surface of the end of the main tubular body 11 and the lower - formed member 13 is integrally formed with the inner surface of the other end of the main tubular body 11 . the mandrel 23 placed in the mold 20 is pulled out after the formation of the coffee - container 10 . it is possible to pull out easily the mandrel 23 from the mold without being hindered by the upper - formed member 13 due to the fact that the inside diameter of the first cavity 21 of the mold 20 is larger than the outside diameter of the second cavity 22 thereof . in the above - described coffee - container 10 , the lower - formed member ( i . e ., the smaller - diameter - formed member ) 13 , which is joined to the lower end of the main tubular body 11 , locates on the inner surface of the main tubular body 11 . as a result , it is possible to increase the effective area , on which the printing is to be applied , by an area occupied by the smaller - diameter - formed member 13 . in the coffee - container 10 of the above - mentioned embodiment , the upper - formed member 12 is integrally formed with the outer surface of the end of the main body 11 , which is formed into the tubular shape of the plastic laminate film , and the lower - formed member 13 is integrally formed with the inner surface of the other end of the main body 11 . it is possible to form the coffee - container 10 in which the upper - formed member 12 is integrally formed with the inner surface of the end of the main body 11 , by changing the positional relationship between the mold 20 and the mandrel 23 on the outer surface of which the main body 11 is put . according to such a coffee - container 10 , it is possible to increase the effective area , on which the printing is to be applied , by the total area occupied by the smaller - diameter - formed member 13 and the larger - diameter - formed member 12 . [ 0103 ] fig4 and 5 show the other embodiment of the first invention . in the embodiment as shown in fig4 a suction line 31 is formed in the mandrel 30 on the outer surface of which the main tubular body 11 is put . a laminate film 32 can be placed on the lower surface of the mandrel 30 by a suction effect . it is therefore possible to join the laminate film 32 integrally with the smaller - diameter - formed member 13 by injecting the synthetic resin material such as polyethylene resin in a molten state into the smaller - diameter - formed member 13 by means of the insert - injection process . there may suitably be used as the above - mentioned plastic laminate film 32 ( i ) a laminate of a polyethylene film having a thickness of 70 μm , a polyester film having a thickness of 12 μm , an aluminum foil having a thickness of 12 μm and a polyethylene film having a thickness of 70 μm , ( ii ) a laminate of a polyethylene film having a thickness of 70 μm , a polyester film having a thickness of 12 μm , a film of ethylene vinyl alcohol ( evoh ) copolymer resins ( i . e ., “ eval ” ( trademark )) having a thickness of 15 μm and a polyethylene film having a thickness of 70 μm or ( iii ) a laminate of a polyethylene film having a thickness of 70 μm , a polyester film having a thickness of 12 μm , an aluminum foil having a thickness of 40 μm and a polyethylene film having a thickness of 70 μm . in the embodiment as shown in fig5 a suction line 41 is formed in the mandrel 40 on the outer surface of which the main tubular body 11 is put . a synthetic resin - formed body 42 , which has previously been formed , can be placed on the lower surface of the mandrel 40 by a suction effect . it is therefore possible to join the synthetic resin - formed body 42 integrally with the smaller - diameter - formed member 13 by injecting the synthetic resin material such as polyethylene resin in a molten state into the smaller - diameter - formed member 13 by means of the insert - injection process . the synthetic resin - formed body 42 can be obtained by subjecting a polyethylene film having a thickness of 70 μm , a polyester film having a thickness of 12 μm , an aluminum foil having a thickness of 40 μm and a polyethylene film having a thickness of 7 μm to a press forming process . when the plastic container is used as a container in which invasion of oxygen should be avoided , it is preferable to form the synthetic resin - formed body 42 integrally with the small - diameter - formed member 13 of the plastic container in this manner . now , embodiments of a container for fluid of the second invention will be described in detail below with reference to fig7 to 15 . description will be given below of one of the embodiments of the container for fluid of the second invention with reference to fig7 to 12 . the container 51 for fluid of this embodiment is composed of a main body 60 having opposite opening ends , i . e ., front and rear opening ends , and of a pair of closing devices , i . e ., a front - bottom member 70 for closing the front opening end of the main body 60 and a rear bottom member 80 for closing the rear opening end of the main body 60 , as shown in fig8 and 9 . the main body 60 is formed of a laminate 61 into a tubular shape . the laminate 61 comprises a plurality of flexible films ( in general , at least three flexible films ). the main body 60 tapers off from one end ( i . e ., the left - hand end in fig8 ( hereinafter referred to as the “ front end ”) to the other end ( i . e ., the right - hand end in fig8 ( hereinafter referred to as the “ rear end ”). the main body 60 may have a cylindrical shape having a constant diameter over its longitudinal entirety . the main body 60 can receive in its inside various fluid such as adhesive , sealant , jam or the like . the width of the laminate 61 becomes gradually smaller from the front end to the rear end as shown in fig1 in correspondence to the tapered main body 60 . the main body 60 can be formed by joining one longitudinal edge of the laminate 61 with the other longitudinal edge thereof as described later . the laminate 61 is composed of four films , i . e ., the first to fourth films 62 to 65 as shown in fig7 which locate from the outer peripheral side of the main body 60 toward the inner peripheral side thereof in this order . when the container 51 is inserted into a cylinder c ( see fig1 ) of a fluid discharging gun or the other fluid discharging apparatus , the first film 62 comes into contact with the inner surface of the cylinder c . it is therefore preferable to use a film having an excellent scratching resistance and a small coefficient of friction , as the first film 62 . the resin film is generally used as the first film 62 . in this case , it is preferable to use a transparent polyethylene film having a thickness of from 30 μm to 60 μm . a cast polypropylene ( cpp ) film may be used . the second film 63 is a resin film . characters , devices , symbols and the like can easily be printed on the surface ( appearing on the outer peripheral side of the main body 60 ) of the above - mentioned resin film . in this embodiment , a polyester film having a thickness of from 12 μm to 16 μm is used . a film of nylon or oriented polypropylene ( opp ) may be used alternatively . the transparent first film 62 permits the characters or the like printed on the surface of the second film 63 to be observed visually from the outside of the main body 60 . the third film 64 has a function of imparting non - permeability to the laminate 61 . a metallic foil is usually used as the third film 64 . with respect to the metallic film , it is preferable to use an aluminum foil having a lightweight . the aluminum foil preferably has a thickness of from 9 μm to 12 μm . the fourth film 65 has a function of protecting the third film 64 , which is formed of the aluminum foil to prevent it from breaking during the manufacturing process of the container 51 . a resin film is usually used as the fourth film 65 . there is no specific limitation of material for forming the fourth film 65 . however , the same polyethylene film as the first film 62 is used in this embodiment in view of the fact that the main body 60 is formed of the laminate 61 . these aspects will be described later . the second film 63 and the third film 64 are joined with each other over their entire opposing surfaces by adhesive 90 . the third film 64 and the fourth film 65 are joined with each other in the same manner . the respective opposing portions of the first film 62 and the second film 63 are merely joined with each other by adhesive 90 ( the portions of the first and second films 62 , 63 , which are joined with each other by the adhesive , are hereinafter referred to as the “ joined portions ” 91 ). the remaining portions of the first and second films 62 , 63 other than the joined portions 91 are not joined with each other . as a result , the remaining portions of the first and second films 62 , 63 other than the joined portions 91 can independently behave as the flexible film . gaps having a height corresponding to the thickness of the adhesive 90 are formed between the above - mentioned remaining portions of the first and second films 62 , 63 . the supply of air into these gaps forms air layers 66 between the first and second films 62 , 63 . these air layers 66 have the advantage of improving an impact resistance of the main body 60 . the above - mentioned adhesion process for joining the first and second films 62 and 63 with each other may be substituted by a fusion bonding process . the first to fourth films 62 to 65 are subjected to a lamination process to form the laminate 61 . in this case , application of adhesive onto at least one of the opposing surfaces of each set of the second and third films 63 , 64 and the third and fourth films 64 , 65 over its entirety may suffice prior to the lamination process . application of adhesive onto a portion of at least one of the opposing surfaces of the first and second films 62 and 63 , in which portion the joined portion 91 is to be formed , may suffice on the other hand . the laminate 61 having the above - mentioned structure is wound up into a roll as shown in fig1 and one edge 61 a of the laminate 61 is placed on the other edge 61 b thereof . the inner surface of the one edge 61 a of the laminate ( i . e ., the inner surface of the first film 62 ) and the outer surface of the other edge 61 b thereof ( i . e ., the outer surface of the fourth film 65 ) are jointed with each other by means of adhesive . the formation of the main body 60 is completed in this manner . the same kind of material is used for forming the first and fourth films 62 and 65 in order to improve the adhesive strength of the opposite edge portions 61 a , 61 b . the main body 60 may be formed by bending the opposite edge portions 61 a , 61 b of the laminate 61 so as to cause them to project outward in the diametrical direction of the main body 60 and joining the opposite edge portions 61 a , 61 b ( on the inner surface of the fourth film 65 ) with each other by means of adhesive . in such a case , the joined portions 61 a , 61 b , which project outward , are pushed down in any one of directions , which are indicated by arrows in fig1 , and joined onto the outer surface of the main body 60 by means of adhesive . as a result , the joined portions of the main body 60 have a larger thickness than the remaining portion . in view of this fact , it is preferable to form the main body 60 in the manner as shown in fig1 . in the main body 60 as shown in fig1 the opposite edge portions of the same film , i . e ., the fourth film 65 are joined with each other . consequently , the formation of the first film 62 of the different material from that of the fourth film 65 will cause no problem . the other joining process may be adopted to form the main body 60 of the laminate 61 . provided that a sufficient adhesive strength can be ensured , the opposite edges of the laminate 61 may be butted together and joined with each other by mean of adhesive . in any one of the above - described joining processes , the adhesive joining may be substituted by a fusion bonding joining . the front - bottom member 70 is formed of resin having a relatively high hardness . the front - bottom member 70 has a disc - shaped portion 71 . the disc - shaped portion 71 is provided on its outer periphery with a tubular portion 72 having a dual - tubular structure . the inside diameter of the outer tube of the tubular portion 72 is substantially identical to the outside diameter of the front - end portion of the main body 60 . the front - end portion of the main body 60 is fitted into the inner surface of the outer tube of the tubular portion 72 so as to be joined thereto by means of adhesive . the front opening end of the main body 60 is closed in this manner . there may be adopted a structure in which the front end portion of the main body 60 is fitted into the outer surface of the tubular portion 72 so as to be joined thereto by means of adhesive . the disc - shaped portion 71 has on its central portion a projection 73 , which projects outward in the opposite direction to the main body 60 . the projection 73 has a hole 74 , which passes through the central portion of the projection 73 . a sealing film 75 is provided on the surface of the disc - shaped portion 71 , which faces the main body 60 , so as to close the hole 74 . the sealing film 75 has a function of preventing fluid received in the main body 60 from leaking out . the rear - bottom member 80 has a disc - shaped portion 81 . the disc - shaped portion 81 is provided on its outer periphery with a tubular portion 82 , which projects toward the main body 60 . the inside diameter of the tubular portion 82 is substantially identical to the outside diameter of the rear end portion of the main body 60 . the rear end portion of the main body 60 is fitted into the inner surface of the tubular portion 82 so as to be joined thereto by means of adhesive . there may be adopted a structure in which the rear end portion of the main body 60 is fitted into the outer surface of the tubular portion 82 so as to be joined thereto by means of adhesive . [ 0124 ] fig1 shows the laminate 61 in an expanded state . portions where the joined portions 91 are formed are shown by cross - hatching in fig1 . as is clear from the figure , the joined portions 91 is composed of ( i ) portions that are formed so as to extend on the entire periphery of the front and rear ends of the main body 60 , which is formed of the laminate 61 , ( ii ) a portion that is formed so as to extend from the front end of the laminate 61 to the rear end thereof along the horizontal line , which passes through the center of the laminate 61 , and ( iii ) portions ( in this embodiment , three portions ) that are formed so as to extend from the longitudinal upper edge of the laminate 61 to the longitudinal lower edge thereof at regular intervals . when the main body 60 is formed by winding up the laminate 61 into a roll so as to place its longitudinal edge ( i . e ., the one edge 61 a as shown in fig1 ) on the other longitudinal edge ( i . e ., the other edge 61 b as shown in fig1 ), there are formed the joined portions 91 , that have circular - shaped glued ( joined ) portions 92 circumferentially extending on the main body 60 and longitudinal glued ( joined ) portions 93 extending from the front end of the main body 60 to the rear end thereof in its longitudinal direction . the circular - shaped glued portions 92 are formed on the front and rear ends of the main body and the middle portion thereof so as to provide the total number of five . the longitudinal edge of the laminate 61 is glued onto the other longitudinal edge thereof , with the result that the two longitudinal glued portions 93 are formed on the periphery of the main body 60 so as to separate from each other by the central angle of 180 degrees of the main body 60 . portions of the laminate 61 other than the circular - shaped glued portions 92 and the longitudinal glued portions 93 ( i . e ., the portions surrounded by the circular - shaped glued portions 92 and the longitudinal glued portions 93 are remained as non - glued portions ( i . e ., non - joined portions ) 94 in which the first film 62 and the second film 63 are not glued to each other . in these non - glued portions 94 , the first and second films 62 and 63 can independently behave as the flexible film . now , description will be given below with reference to fig1 of how to use the container 51 for fluid having the above - described structure . first , the sealing film 75 is broken and the nozzle n is fitted into the outer periphery of the projection 73 of the disc - shaped portion 71 . it is easy to break the sealing film 75 with the use of the tip end of the nozzle n . then , the container 51 is inserted into the cylinder c of a fluid discharging gun or the other fluid discharging apparatus . when a rod r pushes a pressing plate ( i . e ., a pressing body ) b through the piston p , the main body 60 of the container 51 is squeezed so that its rear portion deforms into a bellows - shape . consequently , the fluid received in the container 51 is discharged from the front opening end of the nozzle n . the major portions of the first and second films 62 and 63 are not glued to each other so that these films can independently behave as the flexible film . as a result , the first film 62 serves as the separate tubular body , which is disclosed in japanese patent provisional publication no . s56 - 51 , 265 , i . e ., as the tubular body into which the container is to be inserted . it is therefore possible to prevent the laminate 61 forming the main body 60 from being caught between the inner surface of the cylinder and the outer peripheral surface of the pressing plate b . it is unnecessary to use , unlike the prior art disclosed in japanese patent provisional publication no . s56 - 51 , 265 , the separate tubular body into which the container 51 is to be inserted , thus saving the labor accordingly and leading to a decreased amount of wastes due to no use of the separate tubular body . the circular shaped glued ( joined ) portion 92 formed at the rear end of the main body 60 makes it possible to prevent more surely the occurrence of the above - mentioned catching problem of the laminate 61 . more specifically , the portions of the laminate 61 , which correspond to the circular shaped glued portions 92 have a larger strength ( i . e ., a more excellent tenacious property ) than that of the non - glued portions 94 in which the first and second films 62 and 63 are not glued to each other . accordingly , when the pressing plate b presses the rear bottom member 80 of the container 51 , the laminate 61 can deform inward at the boundary between the circular shaped glued portion 92 , which is formed at the rearmost side of the main body 60 , and the non - glued portion 94 , which is in the vicinity of the above - mentioned circular shaped glued portion 92 . as a result , the main body 60 can surely be squeezed to deform into the bellows - shape along with the advance of the pressing plate b . it is therefore possible to prevent more surely the occurrence of the catching problem of the laminate 61 . an experiment was made to recognize the effect of preventing the occurrence of the catching problem of the laminate 61 . containers 51 of the present invention having the above - described structure . the comparative container had the same structure as that of the container 51 of the present invention except that the opposing surfaces of the first and second films 62 and 63 are glued to each other over its entirety . a discharging test of fluid was carried out for each of ten containers of the present invention and each of ten comparative containers with the use of the same fluid discharging apparatus . in any one of the containers of the present invention , there was observed no occurrence of the catching problem of the laminate 61 . on the contrary , in all of the ten comparative containers , the catching problem of the laminate occurred . in one of the comparative containers , it became impossible to move the pressing plate b during the discharging operation so that the discharging operation could not be completed . description will be given below of the other embodiments of the container of the second invention as shown in fig1 and 15 . only constructional components of the other embodiments of the second invention , which are different from those of the first embodiment of the second invention , will be described . the same reference numerals as those of the first embodiment of the second invention are given to the same constructional components and description of them is omitted . the container 2 for fluid of the embodiment of the second invention as shown in fig1 comprises a straight portion 60 a and a tapered portion 60 b . the straight portion 60 a locates on the front side of the main body 60 and has a constant outside diameter and a length corresponding to the distance from two third to three fourth of the total length of the main body 60 . the tapered portion 60 b tapers off to its rear shape described above , the catching problem of the laminate may easily occur at the boundary between the straight portion 60 a and the tapered portion 60 b . in view of this fact , the circular - shaped glued joined ) portion 92 is formed at the above - mentioned boundary . in this embodiment , the circular - shaped glued portion 92 is formed at the rear end of the straight portion 60 a . the circular - shaped glued portion 92 may be formed at the front end of the tapered portion 60 b . the circular - shaped glued portion 92 may extend from the rear end of the straight portion 60 a to the front end of the tapered portion 60 b . in addition to the above - mentioned circular - shaped glued portion 92 , or in replacement thereof , the same circular - shaped glued portions 92 and the longitudinal glued portions 93 of the first embodiment of the second invention may be formed . in the container 53 of the embodiment of the second invention as shown in fig1 , the opposite opening ends of the main body 60 are narrowed and closed by thick wires 100 , 100 serving as the closing device , respectively . a circular - shaped glued joined ) portion is formed on each of the opposite ends and the center of a cylindrical portion of the main body 60 , which has a constant diameter , except for the opposite narrowed portions . in this embodiment , longitudinal glued ( joined ) portions may be formed so as to extend horizontally between the adjacent circular - shaped glued portions 92 , 92 . the second invention is not limited only to the above - described embodiments and includes further modified embodiments . the containers of the above - described embodiments have at least one circular - shaped glued portions 92 . the containers may have no circular - shaped glued portion and have at least one longitudinal glued portion . it is however preferable to form on the entire periphery of the laminate 61 a glued ( joined ) portion 91 by which the circular - shaped glued portions provided on the opposite ends of the main body 60 and the at least one longitudinal glued portion are formed . when the glued portion 91 is formed on the entire periphery of the laminate 61 so as to have a rectangular closed configuration in this manner , it is possible to prevent the edge portions of the first and second films 62 and 63 from peeling off during the step of winding up the laminate 61 into a roll to form the main body 60 . as a result , these films 62 and 63 can be handled as a single united member , thus leading to an easy manufacture of the main body 60 . a glued ( joined ) portion may be formed in a spiral shape in replacement of the circular - shaped glued portions 92 and the longitudinal glued portion 93 . in addition to such a spiral - shaped glued portion , the circular - shaped glued portions may be formed on the opposite ends of the main body . in the above - described embodiments of the second invention , the non - glued portions are formed between the second film 63 and the first film 62 locating in the outermost position of the main body . the non - glued portions 94 may be formed between the other adjacent two films . there may be adopted a structure in which an additional film formed of the same material as that of the first film is provided between the first film 62 and the second film 63 , the additional film is glued on the entire surface of the second film 63 and the glued portions 91 and the non - glued portions 94 are formed between the additional film and the first film 62 . such a structure makes it possible to improve the strength of the main body 60 . now , embodiments of a fluid discharging apparatus of the third invention will be described in detail below with reference to fig1 to 23 . [ 0140 ] fig1 illustrates a fluid - discharging gun 111 as an embodiment of the fluid discharging apparatus of the third invention . the fluid discharging gun 111 has a main body 121 . the main body 121 has a lever 122 , which is provided thereon so as to be swingable . the swing motion of the lever 122 in the direction of an arrow a as shown in fig1 advances a rod 123 and a piston 124 provided at the end of the rod 123 ( i . e ., moves them in the left - hand direction in fig1 ). it is possible to cause the rod 123 and the piston 124 , which have been in an advanced state , to retreat by swinging a holding lever 125 in the direction - of an arrow b as shown in fig1 . the main body 121 is provided on its front edge with a supporting member 126 , which is in parallel with the rod 123 . the supporting member 126 is formed into a semi - circular tube having an upper opening , which extends in the longitudinal direction . the supporting member 126 has a stopper plate 127 having a horseshoe shape , which is fixed to the front edge of the supporting member 126 . [ 0141 ] fig1 is a view illustrating a state in which an installation apparatus for a fluid dispensing cartridge ( hereinafter referred to as the “ cartridge installation apparatus ”) is fitted to the fluid discharging gun 111 described above . the cartridge installation apparatus 112 is composed of a receiving tube 131 having a tubular shape with opposite opening ends and of a pressing body 132 , which is provided in the inside of the receiving tube 131 so as to be slidable . when the cartridge installation apparatus 112 is fitted to the fluid discharging gun 111 , the pressing body 132 is located at the one end side of the receiving tube 131 and the receiving tube 131 is placed on the supporting member 126 so that the one end of the receiving tube 131 faces the piston 124 . [ 0142 ] fig1 is a view illustrating the fluid - dispensing cartridge ( hereinafter simply referred to as the “ cartridge ”) 113 that is to be fitted to the fluid discharging gun 111 through the above - mentioned cartridge installation apparatus . the cartridge 113 is obtained by forming a reinforcement tube 142 on the outer periphery of the opening end of a tube 141 formed of a single thin film or a plurality of thin films and forming a bottom 143 at the other opening end of the tube 141 to obtain a cartridge body , filling the cartridge body with fluid such as adhesive or the like and closing the opening end of the tube 141 with a plug member 144 . the plug member 144 has a discharge port 144 a , which is closed by a sealing sheet 145 . in the cartridge 113 of this embodiment , the tube 141 tapers off from the plug member 144 to the bottom 143 . the tube 141 may have a constant outside diameter over its longitudinal entirety . when fluid is discharged from the cartridge 113 with the use of the fluid discharging gun 111 , a nozzle 114 is fitted to the plug member 144 as shown in fig1 . the nozzle 114 has a sharp point 114 a , which can break the sealing sheet 145 so as to permit the fluid received in the cartridge 113 to flow from the discharge port 144 a into the nozzle 114 . then , the cartridge 113 is inserted from its bottom 143 side into the receiving tube 131 of the cartridge installation apparatus 112 as shown in fig1 . then , the nozzle 114 passes through the stopper plate 127 , thus completing the fitting step of the cartridge installation apparatus 112 to the fluid - discharging gun 111 . after the completion of the fitting step mentioned above , the piston 124 advanced pushes the cartridge 113 through the pressing body 132 . consequently , the tube 141 is gradually squeezed from the bottom 141 side . the fluid received in the cartridge 113 is discharged from the nozzle 114 in this manner . the cartridge 113 as shown in fig1 may be substituted by the other cartridge 113 ′ or 113 ″ as shown in fig1 or 20 . the cartridge 113 ′ as shown in fig1 has a structure in which a nozzle 114 ′ having a closed tip end is screwed onto the discharge port 144 a of the plug member 144 and the other opening end is narrowed and closed by a fastener 146 in replacement of the bottom 143 . when the cartridge 113 ′ is used , a cutter cuts off the tip end of the nozzle 114 ′. the cartridge 113 ″ as shown in fig2 has a structure in which the opposite opening ends of the tube 141 are narrowed and closed by fasteners 146 , 146 , respectively . when the cartridge 113 ″ is used , the one end of the tube 141 is cut to be opened and then the tube 141 is inserted into the receiving tube 131 of the cartridge installation apparatus 112 . the nozzle is fitted into the opening end of the receiving tube 131 , which locates in the one end of the tube 141 , which has been cut off . then , the cartridge installation apparatus 112 is fitted to the fluid discharging gun 111 . the fluid discharging gun 111 and the cartridge installation apparatus 112 has features described below that can prevent the thin film , of which the cartridge 113 ( 113 ′, 113 ′) is formed , from being caught between the inner peripheral surface of the receiving tube 131 and the outer peripheral surface of the pressing body 132 . first , description of the fluid discharging gun 111 will be given below . the above - mentioned piston 124 is composed of a disc - shaped member 128 and a pair of nuts 129 a , 129 b . the disc - shaped member 128 has a base plate 128 a having a circular disc - shape , a tapered portion 128 b extending forward from the periphery of the base plate 128 a so that the outside diameter of the tapered portion 128 b becomes gradually larger , and a ring - shaped portion 128 c , which is integrally formed with the periphery of the tapered portion 128 b so as to be in parallel with the base plate 128 a . the rod 123 passes through the central portion of the base plate 128 a . the nuts 129 a , 129 b locate on the opposite sides of the disc shaped member 128 , respectively , and engage with the front - end portion of the rod 123 . the disc - shaped member 128 is fixed to the rod 123 by fastening the nuts 129 a , 129 b so as to held the disc - shaped member 128 between them . the depth of the disc - shaped member 128 , i . e ., the distance “ l ” from the front surface of the ring - shaped portion 128 c to the front surface of the base plate 128 a is previously determined to be larger than the thickness of the nut 129 a locating in the front side of the disc - shaped member 128 , i . e ., the distance “ t ” between the opposite surfaces of the nut 129 a in its longitudinal direction . accordingly , the front surface of the ring - shaped portion 128 c of the disc - shaped member 128 locates in a position where is apart in the forward direction from the front surface of the nut 129 a by the distance ( l − t ). the distance ( l − t ) can be changed by substituting the nut 129 a with the other nut having the different thickness . in the cartridge installation apparatus 112 , the pressing body 132 has a feature by which the catching problem of the film can be solved . more specifically , the pressing body 132 is formed of resin . the pressing body 132 is composed of a tubular member 132 a formed into a short tube and of a plate member 132 b , which is integrally formed with the inner surface of the tubular member 132 a and has a circular shape , as shown in fig2 and 22 . the tubular member 132 a is composed of an intermediate portion and a pair of ring - shaped projection portions 132 c formed at the opposite edges of the intermediate portion . the intermediate portion has an outside diameter , which is smaller than the inside diameter of the receiving tube 131 . each of the projection portions 132 c has an outside diameter , which is slightly larger than the inside diameter of the receiving tube 131 . the projection portions 132 c come into contact with the inner surface of the receiving tube 131 under a prescribed pressure . on the contrary , the intermediate portion of the tubular member 132 a does not come into contact with the receiving tube 131 . such a structure makes it possible to increase the contact pressure of the projection portions 132 c with the receiving tube 131 . the tubular member 132 a has an inside diameter , which is larger than the outside diameter of the disc - shaped member 128 of the piston 124 . accordingly , the piston 124 can move forward to locate in the tubular member 132 a so as to come into contact with the plate member 132 b without coming into contact with the tubular member 132 a . the plate member 132 b has a projection 132 d formed on the central portion of the plate member 132 b . the projecting length “ h ” of the projection 132 d is previously determined so as to satisfy the following formula : accordingly , when the piston moves forward , the nut 129 a of the piston 124 first comes into contact with the projection 132 d of the plate member 132 b . in this state , the ring - shaped portion 128 c of the disc - shaped member 128 locates in a position where is apart in the rearward direction from the back surface of the plate member 132 b by the distance “ d = h −( l − t ). the plate member 132 b has a thickness , which is smaller than the length of the tubular member 132 a in its longitudinal direction . the plate member 132 b is designed so that , when the nut 129 a presses forward the central portion of the plate member 132 b , the pressed surface of the plate member 132 b becomes concave and the opposite surface thereof becomes convex , with the result that the plate member 132 b elastically deforms into a curved shape over its entirety . the plate member 132 b locates in the central portion of the tubular member 132 a in its longitudinal direction . when the plate member 132 b elastically deforms into the curved shape , the tubular member 132 a also elastically deforms so that the outside diameter of the projection portion 132 c locating in the front side in the longitudinal direction of the tubular member 132 a ( hereinafter referred to as the “ front - side projection portion 132 c ”) increases and the outside diameter of the projection portion 132 c locating in the rear side in the longitudinal direction thereof decreases . the expansion of the front - side projection portion 132 c is however limited by the receiving tube 131 . neither expansion nor contraction of the projection portions 132 c does not actually occur and alternatively the contact pressure of the front - side projection portion 132 c with the receiving tube 131 increases in accordance with a rate of increase in outside diameter of the front - side projection portion 132 c . the elastic deformation of the plate member 132 b into the curved shape causes the projection 132 d to be displaced forward relative to the periphery of the plate member 132 b . as a result , the ring - shaped portion 128 c of the disc - shaped member 128 comes close to the peripheral portion of the plate member 132 b . when the displacement δ satisfies the following formula : the ring - shaped portion 128 c of the disc - shaped member 128 comes into contact with the peripheral portion of the plate member 132 b . after the ring - shaped portion 128 c comes into contact with the peripheral portion of the plate member 132 b , almost no further deformation of the plate member 132 b occurs , even when the pressing force of the piston 124 against the plate member 132 b is further increased . as a result , it is possible to prevent the contact pressure of the front - side projection portion 132 c with the receiving tube 131 from increasing further , so as to be maintained in the prescribed range . in this embodiment of the third invention , the nut 129 a serves as a central pressing portion and the disc - shaped member 128 serves as a peripheral pressing portion . the inside diameter of the tubular member 132 a is slightly larger than the outside diameter of the bottom 143 of the cartridge 113 . when the pressing body 132 presses the bottom 143 of the cartridge 113 , the bottom 143 comes into the tubular member 132 a so that the projection 132 d can press the central portion of the bottom 143 . there may be adopted a structure in which the end surface of the tubular member 132 a presses the bottom 143 of the cartridge 113 . in the fluid discharging apparatus 111 of this embodiment , the nut 129 a presses the projection 132 d formed on the central portion of the plate member 132 b of the pressing body 132 to deform elastically the plate member 132 b . consequently , it is possible to bring the projection portion 132 c , which locates in the front side in the moving direction of the piston 124 ( i . e ., the front - side projection portion 132 c ), into contact with the inner surface of the receiving tube 131 under the high pressure . it is therefore possible to prevent the film , of which the tube 141 of the cartridge 113 is formed , from being caught between the front - side projection portion 132 c and the receiving tube 131 . the elastic deformation of the plate member 132 b and the tubular member 132 a increases the pressure by which the projection portion 132 c is pressed against the receiving tube 131 . even when a slight wear of the projection portion 132 c occurs , there is almost no decrease in contact pressure of the projection portion 132 c with the receiving tube 131 . when a severe wear of the projection portion 132 c occurs , increase in the elastic deformation limit of the plate member 132 b makes it possible to maintain the high contact pressure of the projection portion 132 c with the receiving tube 131 . as a result , the high contact pressure of the projection portion 132 c with the receiving tube 131 can be maintained for a long time of period . it is therefore possible to prevent the catching problem of the film from occurring for a long period of time . the contact pressure of the front - side projection portion 132 c with the receiving tube 131 can be determined in correspondence to the elastic deformation of the plate member 132 b . the elastic deformation of the plate member 132 b can be determined by the deviation “ d ”, i . e ., the distance between the front surface of the nut 129 a , which is to come into contact with the projection 132 d of the pressing body 132 , and the front surface of the ring - shaped portion 128 c of the disc - shaped member 128 , which is to come into contact with the plate member 132 b of the pressing body 132 . it is therefore possible to adjust the contact pressure of the front - side projection portion 132 c with the receiving tube 131 by changing the thickness of the nut 129 a . in view of this fact , the use of the nut 129 a having a large thickness suffices when a small wear of the front - side projection portion 132 c is observed . the nut 129 a is changed to the other nut having a larger thickness in accordance with an amount of wear of the front - side projection portion 132 c . such a system makes it possible to maintain the almost constant high contact pressure of the projection portion 132 c with the receiving tube 131 for a long period of time . in the cartridge installation apparatus 112 of the third invention , the projection 132 d is formed on each of the opposite surfaces of the plate member 132 b . after the pressing body 132 moves in the left - hand direction in fig1 until the fluid received in the cartridge 113 ( 113 ′, 113 ″) is used up , the cartridge 113 is removed from the left - hand opening of the receiving tube 131 . then , a new cartridge is inserted into the receiving tube 131 from its right - hand opening . the receiving tube 131 with the new cartridge is turned over and put into the fluid - discharging gun 111 . in this case , the piston 124 presses the projection 132 d , which locates in the rear side in fig1 and 21 , and the projection portion 132 c locating in the rear side in fig1 and 21 is located in the front side in the moving direction of the piston 124 so as to come into contact with the inner surface of the receiving tube 131 under high pressure . the service life of the pressing body 132 can be increased twice . the third invention is not limited only to the above - described embodiments and includes further modified embodiments . in the above - described embodiments of the third invention , the piston 124 is composed of the disc - shaped member 128 and the pair of nuts 129 a , 129 b . the disc - shaped member 128 may be used as the piston and the rod 123 may be formed integrally with the disc - shaped member 238 or fixed thereto . there may be adopted a structure in which the rod 123 is provided with a flange in replacement of the nut 129 b , the nut 129 a is formed integrally with the disc - shaped member 128 and the above - mentioned rod 123 is screwed into the nut 129 a to bring the disc - shaped member 128 into contact with the flange . in the above - described embodiments , the nut 129 a can come into contact with the projection 132 d of the pressing body 132 . when the tip end of the rod 123 projects from the nut 129 a , the projected tip end of the rod 123 may come into contact with the above - mentioned projection 132 d . in this case , the tip end of the rod 123 serves as the central pressing portion of the piston 124 . now , embodiments of a fluid discharging apparatus of the fourth invention will be described in detail below with reference to fig2 to 33 . in the embodiment , the fourth invention is applied to a fluid discharging gun ( a fluid discharging apparatus ) 151 as shown in fig2 to 29 . a fluid dispensing cartridge ( hereinafter simply referred to as the “ cartridge ”) 250 as shown in fig3 is used for the fluid discharging gun 151 . the fourth invention may be applied to the other kind of fluid discharging apparatus than the fluid discharging gun 151 . the other kind of cartridge than the cartridge 250 , for example a cartridge 350 as shown in fig3 may be used . first , the cartridge 250 will be described below for convenience . the cartridge 250 is composed of a main body 260 , a reinforcement tube 270 and a bottom 280 . the main body 260 is formed of a single thin film or a plurality of thin films into a tubular shape . the reinforcement tube 270 is provided on the outer periphery of the front opening end of the main body 260 . the bottom 280 closes the rear - opening end of the main body 260 . the main body 260 tapers off from its front end to its rear end . the main body 260 may have a constant outside diameter over its longitudinal entirety . the reinforcement tube 270 has in its central portion a discharge port 271 . the inside diameter of the discharge port 271 becomes gradually smaller from the front end of the discharge port 271 to the rear end thereof . the rear - opening end of the discharge port 271 is closed by means of a sealing member 272 , which is formed of a thin film . the sealing member 272 may be broken by mean of a tubular insertion member 213 of a nozzle 156 , which is to be fitted into the discharge port 271 , described later . as a result , fluid such as adhesive or the like received in the cartridge 250 can be discharged outside from the discharge port 271 through the nozzle 156 . then , description will be given below of the fluid - discharging gun 151 for discharging the fluid from the above - mentioned cartridge 250 . the fluid discharging gun 151 has a main body 152 as shown in fig2 to 27 . the main body 152 is provided with a grip portion 171 and an operation lever 172 . a swing motion of the operation lever 172 in the direction of an arrow a as shown in fig2 causes a rod 173 to move forward in accordance with the swing motion , with the result that a piston 173 provided at the tip end of the rod 173 also moves forward . when the grip of the operation lever 172 is released , the operation lever 172 is returned to the original position by means of a spring 174 . the repetition of the gripping operation of the operation lever 172 and the release thereof causes the rod 173 and the piston 153 to move forward . it is possible to cause the rod 173 and the piston 153 , which have been in an advanced state , to retreat by swinging a holding lever 175 in the direction of an arrow b as shown in fig1 against an expansive force given by a spring 176 . the fluid - discharging gun 152 of the fourth invention has the same fundamental structural components as those of the conventional fluid - discharging gun . the detailed description thereof is therefore omitted . the main body 152 is provided with a supporting plate 177 having a circular shape . the above - mentioned rod 173 passes through the central portion of the supporting plate 177 . the supporting plate 177 is rotatable around its central axis relative to the main body 152 . the frictional resistance between the supporting plate 177 and the main body 152 prevents the supporting plate 177 from rotating freely . the supporting plate 177 can be held in a predetermined rotational position . a pair of supporting arms 154 , 154 are fixed at their root ends to the outer periphery of the supporting plate 177 so as to be spaced apart from each other by a rotational angle of 180 degrees . the distance between the rod 173 and each of the supporting arms 154 , 154 is kept constant . each of the supporting arms 154 , 154 extends in the longitudinal direction of the rod 173 ( i . e ., the moving direction of the piston 153 ). a nozzle - supporting member 155 ( i . e ., a nozzle - supporting device ) is provided at the front ends of the supporting arms 154 , 154 . the nozzle supporting member 155 is composed of an end - plate portion 201 having a circular shape and of a supporting tubular portion 202 , which is formed into a semi - circular tube on the rear surface of the end - plate portion 201 , as shown in fig3 . the supporting tubular portion 202 is provided on the opposite sides of its outer surface with pivot axis portions 203 , 203 each having a square cross - section ( note : the only one pivot axis portion 203 being shown in fig3 ). the pivot axis portions 203 , 203 are inserted into elongated holes 191 , 191 ( note : the only one elongated hole 191 is shown in fig3 ), which are formed at the front ends of the supporting arms 154 , 154 , respectively . each of the elongated holes 191 , 191 extends in the longitudinal direction of the supporting arms 154 , 154 . the front end of each of the elongated holes 191 , 191 has the same width as that of each of the pivot axis portions 203 , 203 . the rear end of each of the elongated holes 191 , 191 is formed into a circular shape having a diameter , which is substantially identical to the length of the diagonal line of the pivot axis portion 203 . as a result , the pivot axis portion 203 is movable in the elongated hole 191 in its longitudinal direction and becomes non - rotatable relative to the supporting arm 154 when being located in the front end of the elongated hole 191 , and becomes , on the other hand , rotatable thereto when being located in the rear circular end of the elongated hole 191 . when the nozzle supporting member 155 moves forward within a prescribed range , which is determined by the length of the elongated hole 191 , it becomes non rotatable relative to the supporting arms 154 , 154 . when the nozzle - supporting member 155 moves rearward , it becomes , on the contrary , rotatable relative to the supporting arms 154 , 154 . a nozzle 156 is detachably mounted on the nozzle - supporting member 155 . the nozzle 156 is composed of ( i ) a nozzle portion 211 tapering off to its tip end , ( ii ) a flange portion 212 , which is formed into a circular shape on the rear end of the nozzle portion 211 and ( iii ) a tubular insertion portion 213 , which is formed on the rear end surface of the flange portion 212 . the nozzle portion 211 , the flange portion 212 and the tubular insertion portion 213 are coaxial to each other . the nozzle portion 211 and the tubular insertion portion 213 communicate with each other . the end - plate portion 201 of the nozzle supporting member 155 has an insertion groove 204 , which opens in the perpendicular direction to the straight line connecting the pair of supporting arms 154 , 154 with each other . the supporting tubular portion 202 is provided on its inner peripheral surface with a projection 205 having an arcuate shape . the space defined by the arcuate projection 205 opens in the same direction as the opening direction of the insertion groove 204 . the root end of the nozzle portion 211 can be inserted into the insertion groove 204 from the opening end thereof . the flange portion 212 can be inserted into a space between the end - plate portion 201 and the projection 205 . the nozzle 156 can detachably be mounted on the nozzle - supporting member 155 in this manner . when the fluid discharging gun 151 is used exclusively for the cartridge 250 , the nozzle 156 may be fixed to or formed integrally with the nozzle - supporting member 155 . the outside diameter of the tubular insertion portion 213 of the nozzle 156 is slightly smaller than the inside diameter of the front end of the discharge port 271 of the cartridge 250 , but is substantially identical to or slightly larger than the inside diameter of the rear end of the discharge port 271 thereof . as a result , the tubular insertion portion 213 can be fitted into the rear end of the discharge port 271 of the cartridge 250 in a pressing - in manner . there occurs no leakage of fluid received in the cartridge 250 between the inner peripheral surface of the discharge port 271 and the outer peripheral surface of the tubular insertion portion 213 . the fitting of the tubular insertion portion 213 into the discharge port 271 of the cartridge 250 causes the nozzle 156 and the cartridge 250 to be connected with each other under a prescribed frictional resistance . the tubular insertion portion 213 has the rear end with an obliquely cut end . the dimensions of the tubular insertion portion 213 are previously determined so that , when the tubular insertion portion 213 is inserted into the discharge port 271 until the flange portion 212 comes into contact with the reinforcement tube 270 , a portion on the obliquely cut end , which is the furthest point from the flange portion 212 , projects in the main body 260 of the cartridge 250 through the rear opening end of the discharge port 271 and the other portion on the obliquely cut end , which is the nearest point from the flange portion 212 , remains in the discharge port 271 . as a result , when the tubular insertion portion 213 is inserted into the discharge port 271 of the cartridge 250 , the sealing member 272 is broken by means of the tubular insertion portion 213 so as not to form any cut piece of the sealing member 272 , which is separated from the remaining portion thereof . if the sealing member 272 is broken by means the tubular insertion portion 213 to form a circular cut piece of the sealing member 272 , which is separated from the remaining portion thereof , the cut piece may enter the nozzle 156 to cause the clogging thereof . in the fourth invention , the scaling member 272 can be broken by cutting it partially along a non - closed cutting line . a cylinder 157 is disposed between the pair of supporting arms 154 , 154 in their middle portions in the longitudinal direction . the cylinder 157 is formed into a tubular shape having a constant diameter over its entire length . the inside diameter of the cylinder 157 is substantially identical with the outside diameter of the front end of the main body 260 , i . e ., the maximum outside diameter of the main body 260 . consequently , the main body 260 of the cartridge 250 can be inserted into the cylinder 157 from its rear end until the reinforcement tube 270 comes into contact with the end of the cylinder 157 . the cylinder 157 is supported on the pair of supporting arms 154 , 154 so as to be movable in the longitudinal direction thereof and swingable . as shown in fig2 to 29 , and 31 , a pair of reinforcement members 221 , 221 each having a relatively large thickness are provided on the outer peripheral surface of the cylinder 157 so as to be spaced apart from each other by the central angle of 180 degrees . a pair of screw members 222 , 222 are screwed to the central portions of the reinforcement members 221 , 221 , respectively . the central axes of the screw members 222 , 222 , which are identical to each other , are also identical to the diametrical line of the cylinder 157 . the screw member 222 is screwed to the reinforcement members 221 so that the head portion of the screw member 222 is apart from the reinforcement member 221 by the same distance as the thickness of the supporting arm 154 . each of the supporting arms 154 , 154 has a support hole 192 , which is formed in the central portion of the supporting arm 154 so as to extend in the longitudinal direction thereof . shank portions 222 b of the screw members 222 are inserted into the respective support holes 192 so as to be slidable and rotatable . the cylinder 157 is supported at its central portion on the pair of supporting arms 154 , 154 around the axis ( i . e ., the screw members 222 ), which is perpendicular to the pair of supporting arms 154 , 154 . as shown in fig2 to 27 , a pressing body 158 is provided in the inside of the cylinder 157 so as to be slidable therein . the pressing body 158 presses the rear end of the cartridge 250 , which is inserted into the cylinder 157 , to squeeze the main body 260 . the pressing body 158 is pushed to move forward by the piston 153 . the pressing body 158 moves to the end of the cylinder 157 when fluid received in the cartridge 250 is used up . in this state , when a new cartridge 250 is inserted into the cylinder 157 from the other end , the bottom 280 of the cartridge 250 comes into contact with the pressing body 158 or a small gap is formed between the bottom 280 of the cartridge 250 and the pressing body 158 . such an insertion operation of the new cartridge 250 can be applied to either a case where the pressing body 158 is moved to the one end of the cylinder 157 or a case where the pressing body 158 is moved to the other end of the cylinder 157 . accordingly , in order to insert the new cartridge 250 into the cylinder 157 after the pressing body 158 is moved to any one of the opposite ends to use up fluid received in the old cartridge , a simple insertion operation of the new cartridge 250 into the cylinder 157 from the other end will suffice and there needs no returning operation of the pressing body 158 . when fluid received in the cartridge 250 with the use of the fluid discharging gun 151 having the above - described structure , the nozzle 156 is previously attached to the nozzle supporting member 155 and the pressing body 158 is previously shifted to the one end of the cylinder 157 . then , the cylinder 157 is moved rearward so that the screw members 222 , 222 come into contact with the rear edges of the support holes 192 , 192 , respectively , and the cylinder 157 is swung so as to be perpendicular to the supporting arms 154 , 154 , as shown in fig2 and 26 . any one of the above - mentioned sliding and swinging operations may be carried out prior to the other of them . when the new cartridge 250 is exchanged for the used cartridge 250 , the cylinder 157 is however first slid rearward , and then swung , as described later . with respect to the swing operation of the cylinder 157 , it is preferable to hold the supporting arms 154 , 154 horizontally and the cylinder 157 is swung so that the one end of the cylinder 157 , in which the pressing body 158 is fitted , locates in the lower side and the other opening end of the cylinder 157 locates in the upper side . then , the cartridge 250 is inserted into the cylinder 157 from its other opening end . such an insertion operation is carried out so that the rear end of the cartridge 250 comes into contact with the pressing body 158 in the cylinder 157 . after the insertion operation of the cartridge 250 is completed so that the reinforcement tube 270 comes into contact with the opposite end of the cylinder 157 , the cylinder 157 is swung so as to be in parallel with the supporting arms 154 , thus causing the reinforcement tube 270 to face the nozzle supporting member 155 . then , the cylinder 157 is slid forward . the sliding operation of the cylinder 157 may be carried out by holding directly it with a hand and moving it or causing the piston 153 to press forward the pressing body 158 . the cylinder 157 is moved forward until the reinforcement tube 270 comes into contact with the projection 205 of the nozzle - supporting member 155 . as a result , the tubular insertion portion 213 of the nozzle 156 is fitted into the discharge port 271 of the cartridge 250 to break the sealing member 272 . this makes it possible to cause the fluid received in the cartridge 250 to flow into the nozzle 156 . then , the piston 153 moves forward as shown in fig2 to press the bottom 280 of the cartridge 250 through the pressing body 158 to move the bottom 280 forward . consequently , the cartridge 250 is squeezed from its rear end into a bellows - shape , with the result that the fluid received in the cartridge 250 is discharged from the nozzle 156 . after the entire main body 260 of the cartridge 250 is squeezed to use up the fluid in the cartridge 250 , the piston 153 moves rearward as shown in fig2 so as to be pulled out from the cylinder 157 . then , the cylinder 157 moves rearward . in this state , the tubular insertion portion 213 of the nozzle 156 is fitted into the discharge port 271 of the squeezed cartridge 250 in the pressing - in manner . the cartridge 250 , which is connected to the nozzle supporting member 155 through the nozzle 156 , is pulled forward from the cylinder 157 along with the rearward movement of the cylinder 157 . then , the nozzle - supporting member 155 moves rearward and swings by an angle of about 90 degrees as shown in fig2 so that the used cartridge 250 locates below the nozzle - supporting member 155 . in this state , the cylinder 157 may be located in parallel with the supporting arms 154 , 154 . it is however preferable to swing the cylinder 157 so as to locate vertically its longitudinal axis , thus preventing the cylinder 157 from being a hindrance to the removal of the cartridge 250 . then , the cartridge 250 is pulled out from the nozzle 156 , while holding the portions of the outer peripheral surface of the reinforcement tube 270 of the cartridge 250 with two fingers , which portions are exposed from an open space of the supporting tubular portion 202 and a cut - out 202 a formed on the periphery thereof . in this state , the entire used cartridge 250 locates below the supporting arms 154 , 154 so that they do not hinder the hold of the reinforcement tube 270 and the removal of the cartridge 250 from the nozzle 156 . it is therefore possible to remove