the invention relates to a complex profile bar 1 consisting of a profile bar length 2 , preferentially in the form of a metal alloy , and in particular of aluminium alloy , coated with a metal foil 3 , in particular for the field of the finishings of the building . in an innovating way , the metal foil 3 has a surface hardness higher than that of the profile bar 2 it surrounds . this foil 3 , which includes two main faces corresponding to its greater side surfaces , is fixed to the profile bar 2 so as to adhere at any point of one of these two faces to this profile bar . the invention relates to a method for manufacturing such profile bars 1 coated with a metal foil . according to this method : pre - cut profile bar lengths 2 are conveyed successively and one after another under the action of conveying means , on these profile bar lengths 2 is successively applied , eventually after pre - forming 200 under the action of shaping means , a continuous strip 5 of coating material for gluing same onto each profile bar length 2 , in order to coat it on the face or faces of the profile bar 2 to be coated , at least on a portion of its periphery , under the action of application means . according to an essential feature of the invention , the conveying 400 of these profile bar lengths 2 one after another is carried out while generating 500 a distance between them . this distance is chosen sufficient to allow the implementation of means for cutting , in particular by milling . and this distance is adjusted , at the level of the conveying of the profile bars , in the preferred case of milling by slitting saws , to a value at least equal to the total of the thicknesses of the slitting saws used . preferably , the coating includes a shaping of the continuous strip 5 around the profile bar length 2 , and relates to the coating of several faces of the profile bar length 2 to be coated . the implementation of a metal foil is difficult , at the level of a coating cycle , in particular in the phase of adjustment . the usual methods for coating profile bars with plastic foils allow easy interventions during the adjustment or the production , when observing hazards such as defects on profile bars or the like : indeed , it is then always easy to cut the foil used for coating , for any intervention , or for a mere replacement of the reel . it is obvious that this is completely different in the case of a metal foil . it has thus been contemplated , within the framework of the invention , to intercalate on the supply circuit of the metal foil for coating the profile bar , movable means for cutting the foil 3 before its sizing , designed capable of carrying out a cut perpendicular to its direction of progress and synchronously with the latter a cutting device , in order to be able to cut the foil before the sizing operation . preferably , a movable carriage , for example on ball slides , permits to follow the direction of progress of the foil . on this movable carriage , an oblique slide , in particular perpendicular to this direction of progress , permits to cause a cutting organ to move towards the foil . preferably , this cutting organ can adopt the form of a blade , in particular with a triangular tip . a plate serving as a counter - blade can also be arranged in the extension of the cutting plane , on the other side of the foil . preferably , the movable carriage also includes a set of jaws permitting to seize the foil in order to ensure the synchronization of the cutting motion with the progress of the foil . the coating of a metal profile bar 2 with a continuous strip 5 consisting , according to the invention , of a metal foil 3 , in particular of a stainless - steel foil in the preferred application of the invention , raises new problems , compared to the coating of a profile bar with any foil whatsoever . the main problem is that of the separation of the coated profile bar lengths . indeed , the usual methods for separating profile bars coated with plastic foils or the like , as well as cutting on the fly or cutting with a blade and a counter - blade , are absolutely unusable . on the one hand , the thickness and the shear strength of the metal foil 3 require the implementation of particular cutting means pertaining to the machining of metals , especially in the preferred case of using a stainless - steel foil . on the other hand , the relative positioning , with respect to the continuous strip 5 , of the successive profile bar lengths 2 , after the adhesion , is irregular because of the possibility of a relative sliding between the profile bar lengths 2 and the continuous strip 5 before complete immobilization . two successive profile bar lengths 2 a , 2 b are usually separated by a variable distance which can be of a few millimetres or a few tens of millimetres . the development of the cutting operations thus requires the implementation of a particular method and particular means . it is thus necessary to proceed to a cut at the level of each end of each profile bar length 2 , the first downstream end 6 and the second upstream end 7 , in order to separate the coated length 1 from the continuous strip 5 . thus , the cutting of a profile bar should be carried out with an automated process while continuously moving in a production line 4 , without interrupting the progress of this line 4 , after completion of the coating and the application 600 of the continuous strip 5 on the profile bar lengths 2 , and complete adhesion . in order to solve this new problem , the invention implements 800 cutting means 10 , which are of the type double cutting means , designed to carry out the cuts on the fly . these cutting means 10 include detecting means , consisting of downstream 8 and upstream 9 detecting means , which are capable of detecting the downstream 6 or / and upstream 7 end of each profile bar length 2 . in the preferred application , as can be seen in fig2 , the downstream 8 and upstream 9 detecting means detect the downstream 6 a and upstream 7 b ends , respectively , of two successive lengths 2 a , 2 b . these detecting means 8 , 9 will permit to proceed , at these two ends , to two different cutting operations , taking into consideration the distance between said profile bare lengths 2 a and 2 b . the downstream 8 and upstream 9 detecting means transmit , in real time , the position of the ends 6 a and 7 b to the control and management means 15 . the latter control the movements of at least two cutting tools , downstream 11 and upstream 12 , which are movable in the longitudinal direction d of progress of the profile bar lengths 2 , and with respect to each other , in order to synchronize each of them with the profile bar length involved 2 a , 2 b , at each cutting operation . in a preferred application , the detecting means 8 , 9 consist of photocells or the like , and the control and management means 15 of a programmable automaton , or the like . the downstream 11 and upstream 12 cutting tools can be designed movable in at least one cutting direction c , preferably orthogonal to that of displacement of the profile bar , or also include cutting organs having this mobility . in short , the control and management means 15 are designed so as to control the displacements of the various tools 11 , 12 and movable cutting organs in the various directions d , c . they manage the longitudinal distance of the movable cutting tools 11 , 12 according to the actual distance between the successive profile bar lengths 2 a , 2 b determined by the detecting means 8 , 9 . preferably , but non - restrictively , these cutting means are grouped on one single cutting device . this cutting device is then designed movable , under the action of motorization means 18 controlled by the control and management means 15 , parallel to the longitudinal direction d , and preferably consists of a carriage 16 co - operating with means for guiding 17 in this direction . it is thus made capable of following each profile bar in its progress towards the exit of the production line , as well as returning upstream to follow the next profile bar . in a preferred embodiment , as can be seen in fig2 , each movable cutting tool 11 , 12 includes means for driving , such as an electric motor or the like , a cutting organ 20 , such as a slitting saw . the control and management means 15 position a downstream cutting tool 11 so that its cutting organ 20 coincides with the downstream end 6 a of a first profile bar 2 a so as to permit the milling of the continuous strip 5 of metal foil 3 at the location of this end 6 a . downstream clamping means 13 , integral in longitudinal translation with said movable cutting tool 11 , are then actuated in order to maintain this profile bar length 2 a during the cutting operation . preferably simultaneously , the control and management means 15 longitudinally position an upstream movable cutting tool 12 so that its cutting organ 20 coincides with the upstream end 7 b of the profile bar length 2 b adjacent in upstream direction to the first profile bar length 2 a that is most downstream . similarly , upstream clamping means 14 , integral in longitudinal translation with the upstream movable cutting tool 12 , are actuated in order to maintain the profile bar length 2 b during the cutting operation . upon completion of the two cuts , the downstream clamping means 13 release the most downstream profile bar length 2 a , so as to permit its conveying to an exit station , namely a checking and packing station , the latter operations being preferably carried out continuously . upon complete release of the downstream 13 and upstream 14 clamping means , the control and management means 15 impart to the downstream 11 and upstream 12 movable cutting tools , or to the carriage 16 that carries them , an order to move in translation in the opposite direction with respect to that of the profile bar , so as to bring the cutting means 10 back into a more upstream position , and to make them capable of performing a new cutting operation . it is obvious that it is possible to individualize the movements of each downstream 11 or upstream 12 movable cutting tool in the cutting direction c and in the longitudinal direction d . in order to simplify the control and maintenance , the movements are advantageously coupled to each other , when this is possible . in the embodiment as visible in fig2 , the movements of the two downstream 11 or upstream 12 movable cutting tools in the cutting direction c are combined , which permits to reduce the number of components . for a clean production line , each movable cutting 11 , 12 , is advantageously surrounded by a casing 19 designed capable of being connected to means for sucking up vapour , dust and chips , even foil scraps , resulting from the cutting operations . it is obvious that in the particular embodiment in which two movable cutting tools 11 , 12 are installed on the same carriage 16 , the latter advantageously includes such a single casing 19 , which it is integral with . this arrangement permits to preserve a compact and rather short production line 4 , because it allows , during the progress of a profile bar length 2 the first downstream end 6 of which has been cut , a fast return into their upstream position of the cutting means 10 for the double cutting of its upstream end 7 as well as of the downstream end of the profile bar length that follows . it has in addition the advantage of permitting the mixing on the same production line of profile bar lengths 2 having different lengths . it can of course also be contemplated , without departing from the spirit of this invention , to use such a device to control the movable cutting tools for simultaneously cutting the downstream end and the upstream end of one and the same profile bar length . in this case , upon adhesion of the strip 5 to the profile bar length 2 , the downstream 6 a and upstream 7 a ends of one and the same profile bar length 2 a are detected , then two different cutting operations are proceeded to at these two downstream 6 a and upstream 7 a ends , taking into consideration the distance between same and the position of the profile bar length 2 a . finally , after cutting 900 is carried out , on the one hand , downstream , the evacuation 920 of each finished and cut complex profile bar length 1 and , on the other hand , the evacuation 910 of the continuous strip scraps 5 and the waste resulting from the cutting operations . the evacuation of the finished profile bar lengths 1 can occur in several ways , in the direction d as visible in fig2 , or transversely , or otherwise . it should be noted that the cutting means 10 are multi - task means , which permits their easy conversion for another use , such as continuous cutting , for example of product resulting from drawing , by implementing only one of the movable cutting tools 11 , 12 . the cutting means 10 according to the invention are preferably designed removable , and then include means for detecting and fixing with respect to a machine reference , so as to permit to make the line available for coating profile bars for other applications , as well as the transfer of these cutting means 10 to other coating lines , depending on the productions to be made . in addition to this main problem of cutting at the ends of the profile bar lengths , there are other problems specific to the implementation of a metal foil 3 as a continuous coating strip 5 . according to a particular feature of the invention , the stainless - steel foil is subjected , before its use in the production line , to a treatment for reducing the residual stresses of the stainless steel . the surface preparation of the supports for their adhesion is particularly important . a mechanical or / and chemical preparation treatment 100 is generally necessary to achieve the desired quality of the coated profile bar . a mechanical preparation treatment can be carried out in particular by continuous abrasion or / and brushing of the foil or / and the profile bar on at least one of its faces . a chemical preparation treatment can consist in particular of a treatment for opening the surface pores of the material . particular problems are inherent to the profile bars to be coated and to the way they are obtained , in particular by drawing . one should mention in particular the presence of graphite in the pores of the aluminium profile bars , which constitutes a considerable hindrance during gluing when an adequate preparation for eliminating the graphite has not been carried out before this operation . it can also include a heat treatment for evaporating the solvents after application of a primer , should such be the case . as can be seen in the logical diagram of fig1 , these preparation treatments 100 can occur at different stages of the process , depending on their nature . for the pre - forming 200 of the continuous strip 5 , the means for shaping the continuous strip around the profile bar , as well as the means for applying the coated continuous strip 5 on the profile bar length 2 , traditionally consist of sequences of cylinders , rollers , flat bars and various pre - formers . because of the high strength of the material to be shaped , it can be necessary to choose a particular dimensioning , or also to use pressure means such as jacks or also springy restoring means , such as springs . it is generally difficult to proceed to sizing the profile bar , because of its shape , it is therefore preferable to proceed sizing the continuous strip . for sizing 300 and gluing the continuous strip to the profile bar , glue application means are preferably used . the latter consist in particular of rollers or tubes with lips , or flow - controlled guns . application means 600 maintain the continuous strip 5 and the profile bar 2 integral with each other during their adhesion to each other . parallel to or downstream of the latter are added , in a preferred embodiment , finishing or / and drying means 700 , which can namely include calibration or supporting rods , adhesion - accelerating means , namely heating or / and cooling elements , means for depositing a protection film , labelling means , or the like . according to a particular feature of the invention , the foil used has a thickness ranging from 50 to 200 microns , these values included . preferably , but non - restrictively , the material of the profile bar lengths is chosen among an aluminium or / and copper or / and zinc alloy . the method as described here is particularly satisfactory for the coating of non - metal profile bars . in a particular application , the operation has been applied to a profile bar made of plastic , preferably pvc , for its coating with a foil of aluminium alloy having a thickness ranging from 50 to 300 microns , preferably from 80 to 200 microns , and namely with a value of 150 microns .