fig1 illustrates a perspective view of the sheet material dispensing apparatus 10 . the preferred embodiment of the sheet material dispensing apparatus includes a lower rectangular box portion 15 . the lower rectangular box portion 15 has a top surface 20 , a front surface 22 , a back surface 25 , a bottom 30 , and two opposing side walls 35 and 40 . opposing side walls 35 and 40 are parallel . formed integrally with top surface 20 are two upstanding semi - cylindrical walls 45 and 50 . upstanding semi - cylindrical walls 45 and 50 are rigid and parallel . formed integrally on the outside perimeter of upstanding semi - cylindrical wall 45 is an inward facing , generally u - shaped slot 55 . similarly , an inwardly facing , generally u - shaped slot 60 is integrally formed in the outside perimeter of semi - cylindrical wall 50 . generally u - shaped slots 55 and 60 directly face one another and are parallel and co - axial . opposing side wall 35 of lower rectangular box portion 15 also includes an inward facing , generally u - shaped slot 65 . u - shaped slot 65 extends downwardly along the back of opposing side wall 35 and gently curves forward to become parallel with the lower edge of opposing side wall 35 until it reaches the front surface 22 of lower rectangular box portion 15 . similarly , an inwardly facing , generally u - shaped slot 70 is integrally formed into opposing side wall 40 . slot 70 extends along the back edge of side wall 40 and gently curves to become parallel with the bottom edge of side wall 40 and extends to the front surface 22 of lower rectangular portion 15 . throughout their length , slots 65 and 70 are parallel . generally u - shaped slot 55 has the same dimensions as generally u - shaped slot 70 . in the preferred embodiment , u - shaped slot 55 at the bottom of upstanding , semi - cylindrical wall 45 is placed directly over u - shaped slot 70 , thereby forming a continuous slot around the perimeter of upstanding , semi - cylindrical wall 45 , downward along the back edge of side wall 40 and forward along the bottom edge of side wall 40 terminating at front surface 22 of lower rectangular box portion 15 . similarly , generally u - shaped slot 60 has the same dimensions as generally u - shaped slot 65 . in the preferred embodiment , u - shaped slot 60 , at the perimeter of semi - cylindrical wall 50 , is placed directly above slot 65 , thereby forming a continuous track around the perimeter of semi - cylindrical wall 50 and downward along the back edge of opposing side wall 35 and forward along the bottom edge of side wall 35 terminating at the front surface 22 of lower rectangular box portion 15 . u - shaped slots 55 , 70 , 60 , and 65 together form a parallel trackway 80 . in the preferred embodiment , flexible &# 34 ; roll top &# 34 ; door 85 is slidably placed within parallel trackway 80 . referring to fig2 flexible &# 34 ; roll top &# 34 ; door 85 includes numerous semi - rigid ribs 90 connected alternately between sections of flexible webbing 95 . the connected pattern of semi - rigid ribs 90 and flexible webbing 95 creates a flexible door which is greatly flexible along an axis perpendicular to the axis of each semi - rigid rib 90 , yet less flexible along an axis parallel to each semi - rigid rib 90 . each semi - rigid rib 90 has a cross - sectional diameter which is generally rectangular ; however , the generally rectangular cross - section of each semi - rigid rib 90 is dimensioned to fit within parallel trackway 80 . in the preferred embodiment , the flexible &# 34 ; roll top &# 34 ; door 85 is made of a pliable plastic , such as teflon ; however , other materials with similar properties are contemplated within the scope of the specification . referring to fig3 at the leading edge of flexible &# 34 ; roll top &# 34 ; door 85 , a rigid roller guard 100 is flexibly attached to the first section of flexible webbing 95 of flexible door 85 . roller guard 100 includes a semi - cylindrical shield 105 and two flat end portions 110 and 115 ( as can be seen in fig1 ). rigid extension 120 extends outwardly from flat end portion 110 . the width of rigid extension 120 is dimensioned to fit within u - shaped slots 55 and 70 . rigid extension 125 extends outwardly from flat end portion 115 . the width of rigid extension 125 is dimensioned so that it fits within u - shaped slots 55 and 70 . extending outwardly from rigid extension 120 is lock latch 130 . similarly , extending outwardly from rigid extension 125 is lock latch 135 ( as can be seen in fig1 ). roughly in the center of flat end portion 110 is a hole 140 . similarly , a hole 145 is included roughly in the center of flat end portion 115 . holes 140 and 145 are co - axial . pivotally disposed between holes 140 and 145 is a flexible , cylindrical roller 155 . in the preferred embodiment , flexible roller 155 is made of a pliable rubber ; however , other substances having similar properties are contemplated in the scope of the specification . the axis of cylindrical roller 155 is held co - axial with holes 140 and 145 by pivot pin 160 which extends from hole 140 along the entire axis of cylindrical roller 155 , and extending through hole 145 . semi - cylindrical shield 105 has a front edge 165 . in the preferred embodiment , front edge 165 is smooth , so that it will not tear thin plastic films or other flat products which are to be dispensed by the invention . in an alternate embodiment , front edge 165 is serrated ( shown in phantom in fig3 ). in the alternate embodiment , the serrated front edge is used to encourage linear tearing of sheet material such as paper towels or other paper products . various other methods of cutting or encouraging linear tearing are contemplated within the specification . referring again to fig1 the leading edge of generally u - shaped slot 55 on upstanding semi - cylindrical wall 45 includes a radial lock slot 165 . similarly , the leading edge of u - shaped slot 60 on semi - cylindrical wall 50 includes a radial lock slot 170 . radial lock slot 165 is parallel to radial lock slot 170 . still referring to fig1 the top surface 20 of lower rectangular box portion 15 includes a recessed slot 177 directly adjacent the leading edge of semi - cylindrical walls 45 and 50 . recessed slot 177 can also be seen in fig2 . at each opposing end of recessed slot 177 is an opposing face 178 and 179 . roughly in the center of opposing face 178 is a support hole 175 . roughly in the center of face 179 is a support hole 180 . support holes 175 and 180 are coaxial . cylindrical roller 185 is placed between opposing face 178 and 179 coaxial with holes 175 and 180 . cylindrical roller 185 is pivotally held between opposing face 178 and 179 by pivot pin 190 which extends through hole 175 , throughout the length of cylindrical roller 185 and through hole 180 . in the preferred embodiment , cylindrical roller 185 is made of pliable rubber ; however , other substances having similar properties are contemplated in the scope of the specification . in the preferred embodiment , when the flexible &# 34 ; roll top &# 34 ; door 85 is brought to its closed position , thereby encircling the outer perimeter of both semi - cylindrical wall 45 and semi - cylindrical wall 50 with the exterior of flexible &# 34 ; roll top &# 34 ; door 85 and bringing cylindrical roller 55 is into linear contact with cylindrical roller 185 . a pressure fit is created between cylindrical roller 155 and cylindrical roller 185 by the locking action of lock latch 135 expandably slipping into radial lock slot 165 and radial lock slot 170 respectively . in operation , the flexible &# 34 ; roll top &# 34 ; door 85 of the preferred embodiment is found in its closed position , and the apparatus is assumed to have no sheet material within . the outer edge of roller guard 100 is grasped by the user and lifted upward . the lifting action dislodges lock latch 130 and lock latch 135 from radial lock slot 165 and 170 , respectively . the upward motion further disengages cylindrical roller 185 from cylindrical roller 155 . as flexible &# 34 ; roll top &# 34 ; door 85 is pushed further upward and backward by the user , it slidably moves within parallel trackway 80 extending downward along the back edges of opposing side walls 35 and 40 and forward along the lower edges of side walls 35 and 40 . in its open position , flexible &# 34 ; roll top &# 34 ; door 85 allows an open space 195 between upstanding semi - cylindrical walls 45 and 50 . referring to fig2 sheet material to be dispensed 200 can be easily placed in open space 195 by the user . the front edge of sheet material 200 is then easily played out by the user over cylindrical roller 185 . roller guard 100 is then grasped by the user and pulled forward and downward thereby sliding flexible &# 34 ; roll top &# 34 ; door 85 forward within parallel trackway 80 . when in its fully closed position , lock latch 130 and 135 are again brought to rest within radial lock slots 165 and 170 , thereby pressing cylindrical roller 155 into contact with the upper surface of the sheet of the material to be dispensed 200 . in the preferred embodiment , the sheet material to be dispensed is plastic trash bags . plastic trash bags are often sold in a roll with perforations between each bag . as sheet material 200 is dispensed , the user grasps the first sheet and pulls forwardly . cylindrical rollers 155 and 185 each being in pressed contact with sheet material 200 , rotate oppositely thereby guiding and allowing further sheet material 200 to be dispensed . in the preferred embodiment , as the successive line of perforation in the material to be dispensed reaches and passes the linear intersection between cylindrical rollers 155 and 185 , the user may easily separate successive bags due to the resistance created between cylindrical roller 155 and 185 , and the resulting tension on sheet material 200 . in the preferred embodiment , the sheet material to be dispensed 200 is in rolled form . however , other packaging of sheet material may be alternately used for the roll material disclosed . in many instances , especially in the case of plastic trash bags , successively connected bags are sold folded in boxes . it can be seen that a package of folded bags could be easily placed within open space 195 and thereby dispensed by the invention . in the preferred embodiment , an additional feature is added which adds to the utility of the apparatus as a whole . while not necessary to the functioning of the device , it is helpful to its overall utility . referring to fig2 it can be seen that opposing side wall 40 includes an inwardly facing drawer slot 205 , extending from front surface 22 toward the back surface 25 of lower rectangular box portion 15 . a similar inwardly facing drawer slot 210 is formed on the interior of side wall 40 of lower rectangular box portion 15 ( as can be seen in fig1 ). drawer slots 205 and 210 are parallel and coplanar . referring to fig1 a drawer 215 can be seen to have outwardly facing slide supports 220 and 225 on opposite sides . slide supports 220 and 225 are dimensioned to fit within drawer slot 210 and 205 respectively , and allow drawer 215 to be slid inwardly toward back surface 25 of rectangular box portion 15 . drawer 215 is provided in the preferred embodiment for storage of &# 34 ; twist ties &# 34 ; or other loose items used by manufacturers of plastic bags or other sheet material to be dispensed from the invention .