FR2601346A1 - AUTOMATIC MACHINE FOR PROCESSING A STRIP MATERIAL AND PARTICULARLY FOR CUTTING SUCH A MATERIAL - Google Patents

Abstract

THE INVENTION CONCERNS AN AUTOMATIC MACHINE FOR PROCESSING A STRIP M MATERIAL THAT CAN BE STORED IN THE FORM OF A ROLL. THE MACHINE INCLUDES AN INTERCHANGEABLE POWER SUPPLY MODULE 70 ON WHICH A ROLL OF MATERIAL M CAN BE PREPARED IN ADVANCE. For this purpose, the module 70 is equipped with a retractable rule 100 on which the end of the material is positioned, and a device 108, 110, 114 for keeping this end in place by pinching. THIS CONFIGURATION APPLIES IN PARTICULAR TO A FLUID JET CUTTING MACHINE ALSO INCLUDING A DEVICE FOR MARKING THE MATERIAL BEFORE ITS CUTTING.

Description

AUTOMATIC MACHINE FOR PROCESSING A STRIP MATERIAL

  AND PARTICULARLY FOR CUTTING SUCH A MATERIAL DESCRIPTION

  The invention relates to an automatic machine for processing a strip material such as a laminated material, a fabric or any other material which can be stored in the form

of a roll.

  The invention applies in particular to the case where the treatment carried out on such a machine consists in cutting the material along any line, for example by means of a fluid jet under high pressure. This application is not, however, limiting and the invention can also be used on any other machine such as a draping machine, an embroidery machine, etc. In the French patent n 83 16466 filed on October 17, 1983 by the Société Nationale Industrielle AEROSPATIALE, a machine for cutting strip material by high pressure fluid jet has been described and claimed. In this machine, the roll of material is placed on a receptacle linked to the frame of the machine and the cutting is carried out by means of the combined movements of the material and the cutting nozzle, the latter moving in a direction perpendicular to the direction of displacement

of the material.

  Such a fully automated machine generally operates satisfactorily as long as the roll of material is not exhausted. However, when you reach the end of the roll or when you want to change the nature of the material, there is a significant loss of time following the replacement of the roll of material. Given the very high rate of such a machine, this loss of time is not

obviously not satisfactory.

  An identical problem exists on machines performing treatments of another type on a strip material. The present invention specifically relates to an automatic machine for processing a strip material,

2 601346

  in which the loss of time following the replacement of the roll of material is reduced in considerable proportions, so that the rate of work is not too affected by these replacements. To this end and in accordance with the invention, an automatic machine is proposed for treating a strip material, this machine comprising a frame carrying at least one conveyor belt capable of moving the material in front of at least one station carrying out said treatment, between an inlet end and an outlet end of the frame, a receptacle being provided for receiving a roll of the material to be treated, near the inlet end, characterized in that the receptacle is mounted on a frame of an interchangeable power supply module, one face of this chassis being able to be connected to the input end of the frame by disconnectable connection and positioning means, the chassis of the power supply module also carrying a retractable strip of supporting the end of the material, said strip projecting onto said face of the chassis under the action of elastic means, when the connection and positioning means are disconnected ectés, as well as pinching means to maintain the material near the strip, means to control the release of these means

  pinch being mounted on the machine frame.

  According to a preferred embodiment of the invention, the connection and positioning means comprise magnetic suction cups mounted at the entry end of the frame, metal plates placed opposite these suction cups on said face of the chassis and an electric switch for controlling the suction cups mounted at the entry end of the frame and the closing of which is controlled by a contact between said face of the

chassis and switch.

  According to this same preferred embodiment, the connection and positioning means also comprise at least one conical end centering device mounted at the entry end of the frame and at least one vertical oblong groove

260 1346

  formed on said face of the chassis, facing the centralizer.

  Preferably, the clamping means for their part comprise a transverse arm articulated by its ends on the chassis of the power supply module and pads mounted on the transverse arm by means of swiveling connections, so as to come to be applied by gravity on the material when Les

  connection and positioning means are disconnected.

  The means for controlling The release of the clamping means can then comprise at least one pusher capable of lifting the transverse arm when the connection means

  and positioning devices are connected.

  According to another aspect of the invention, the roll of material is mounted on a mandrel having a tubular end, the machine further comprising an auxiliary frame linked to the frame and disposed on the side of the supply module when the

  connection and positioning means are connected, this auxiliary chassis carrying an engine assembly including a pneumatic clutch able to be introduced into the tubular end of the mandrel under the action of translation means by which this engine assembly is mounted on the chassis Annex.

  The chassis of the supply module preferably carries a transverse roller for tensioning the material, capable of being received in a loop of the material formed between the roll of material received on the receptacle and the clamping means, this roller moving by gravity. in the vertical guides formed in the chassis of the power supply module, limit switches

  high and low being mounted on the auxiliary chassis.

  According to another aspect of the invention, the machine frame carries, near its entry end, at least one pressure roller with an axis slightly inclined with respect to a direction transverse to the direction of movement of the belt. , so as to apply a force to the material

  transverse directed towards a lateral guide carried by the frame.

  In a particular application of such a machine for cutting a strip material, this machine comprises a cutting tool carried by a mobile carriage in a direction transverse to the direction of movement of the belt; material marking means can also

  be supported by the mobile cart.

  Preferably, these marking means comprise a gripping clamp mounted on the mobile carriage by means of means for moving the clamp between a high position and a low position, a marker, and a cap carried by the frame and in which can an active end 10 of the marker, which moreover comprises a zone of

  grip capable of being fitted into said clamp.

  The cap can in particular be mounted in the frame by means of means for moving this cap between a low retracted position and a high position in which the gripping zone is at the level of the clamp, when this

last one is in the down position.

  Finally, the clamp may include two articulated jaws, normally maintained in the closed position by elastic means. A preferred embodiment of the invention will now be described, by way of nonlimiting example, with reference to the appended drawings in which: - Figure 1 is a perspective view schematically showing an automatic machine for cutting a material 25 in a strip, produced in accordance with the invention, - Figure 2 is a top view of the machine shown in Figure 1, - Figure 3 is a side view and in partial section showing on a larger scale the means of marking of the material equipping the machine of FIGS. I and 2, FIG. 4 is a front view showing in particular the support of the clamp ensuring the gripping of the marker, FIG. 5 is a top view of the part of the 35 machine shown in FIG. 4, FIG. 6 is a side view showing in a fragmentary manner, on a larger scale and in partial section, a pressure roller applying the material to be cut on the conveyor belts of the machine, - Figure 7 is a perspective view showing on a larger scale the interchangeable power module fitted to the machine of Figures - 1 and 2, according to the invention, - Figure 8 is a perspective view showing the module d power supply disconnected from the machine frame and showing more precisely the means of connection and positioning of the power module on the frame, - Figure 9 is a side view schematically representing the power module before docking on the frame of the machine, and FIG. 10 is a side view comparable to FIG. 9 showing the module after it has docked on the frame

of the machine.

  FIGS. 1 and 2 show a machine for cutting by high pressure fluid jet produced in accordance with the invention. This machine comprises a frame 10 representing in top view an elongated rectangular shape, the short sides of which respectively form an inlet end 10a and a

  outlet end 10b of the material M to be cut.

  The frame 10 rests on the ground and is divided lengthwise into two approximately equal parts, each supporting a series of notched and juxtaposed conveyor belts 12 and 14. The belts 12 are stretched longitudinally between two transverse rollers 16, the a 30 is placed at the inlet end of the frame 10 and the belts 14 are stretched longitudinally between two transverse rollers 17 one of which is placed at the outlet end 10b of the frame, the other two rollers 16 and 17 being arranged side by side at

center of the machine.

  The horizontal axes of the rollers 16 and 17 are all parallel to each other and arranged at the same level on the frame 10, so that the upper faces of the belts form a horizontal table -mobile capable of receiving the material M to be cut. One of the rollers 16 and 17 over which each of the series of belts 12 and 14 passes is connected to a drive motor (not shown) capable of moving these belts in either direction in a longitudinal direction, as indicated by arrow F in FIG. 2. The control of the advance of the two sets of toothed belts 12 and 14 is

performed synchronously.

  The belts 12 and 14 thus make it possible to move the

  strip material M in front of a cutting station 18 located in the central part of the machine, between the two sets of belts 15 12 and 14.

  This cutting station 18 firstly comprises a fixed horizontal table 20, of small width, ensuring the support of the material to be cut between the adjacent ends of series of

toothed belts 12 and 14.

  The cutting station 18 further comprises a movable carriage 22 able to move on horizontal columns such as 24 arranged transversely, under the action of control means. These control means comprise for example a chain or a toothed belt 26 the ends of which are fixed on the carriage 22. This belt 26 is stretched transversely between two toothed wheels 28 mounted on the frame 10 and one of which is connected to a motor (not shown) ensuring its drive. Thanks to this arrangement, the carriage 30 22 can be moved in either direction in a transverse direction,

  as shown by arrow F in Figure 2.

  In known manner, the carriage 22 supports a nozzle

  cutout 30 located vertically above the fixed table 20.

  This nozzle 30 is connected to an installation for supplying fluid under high pressure, in a manner known per se and

not shown in the figure.

  To allow recovery of the fluid jet emitted by the nozzle 30, the fixed table 20 is pierced over the entire width of the material M with a transverse slot 20a under which is disposed a jet recovery device of any known type. This device can in particular be that described in French patent application No. 83 16466 in the name of the Company

  National Industrial AEROSPATIALE.

  Preferably, the carriage 22 also supports a gripper 32 capable of grasping a marker to perform a preliminary marking on the material to be cut. This clamp 32 is mounted on the carriage 22 of the side opposite the nozzle of

cutout 30.

  As illustrated more precisely in FIGS. 3 to 5, the clamp 32 comprises a support 34, one end of which is articulated on the carriage 22 by an axis 36 oriented parallel to the direction of longitudinal movement F of the machine. At its opposite end, the support 34 carries two jaws 38 articulated on the support by two axes 40 oriented in a direction 20 orthogonal to the axis 36, and approximately vertical. A spring 42, placed between the jaws 38, maintains the latter in a clamping or gripping position. In this position, as illustrated in particular in FIG. 5, the gripping surfaces 38a facing the jaws 38 remain separated from one another. At their ends, these surfaces 38a end in a chamfer allowing the automatic interlocking of the marker, as will be seen later, the gripping surfaces extending behind these chamfers by concave parts having a view from above of the shape of arcs

of circle.

  Referring to Figure 4, we see that in its median zone between its hinge axis 36 and the axes 40 carrying the jaws 38, the support 34 is interposed between a lower stop 35 44 integral with the carriage 22 and the rod vertical 46a of an electromagnet 46 also carried by the carriage. A leaf spring 48 fixed on the lower stop 44 holds the support 34

  permanently in abutment against the rod 46a of the electromagnet.

  Thanks to this configuration, the clamp 32 can occupy two positions depending on whether the electromagnet 46 is energized or not. As shown in solid lines in FIG. 4, when the electromagnet 46 is energized, the rod 46a applies the support 34 of the clamp against the lower stop 44. The clamp 32 then occupies a low position of substantially horizontal grip, in which the axes of the parts in an arc

  gripping surfaces 38a are vertical.

  On the contrary, when the excitation of the electromagnet 46 is interrupted, the spring 48 makes the support 34 of the clamp pivot upwards around its axis 36 (arrow F). The clamp 32 then occupies an inclined high position shown in broken lines in FIG. 4, a position allowing the transport of the

  marker as we will see later.

  To complete the clamp 32, the marking means further comprises a marker 50 whose lower active end 20a 50a carrying the tip 50b is received in a cap 52,

  vertical axis, when not in use.

  This cap 52 is mounted in the frame 10 of the machine, in a cylindrical recess with a vertical axis 54 opening onto the side of the series of belts 12 towards which the clamp 25 is turned, the axis of this recess 54 being located in the vertical plane

median of the clamp 32.

  Inside the frame 10, means are provided for moving the cap 52 between a low position in which the marker 50 is retracted and a high position allowing the gripper to be gripped by the clamp 32 (arrow F). In the embodiment shown in Figure 3, the movement of

  translation F is obtained by pneumatic cylinder.

  Above its end 50a, 4th marker 50 has Above its end 50a, the marker 50 has a gripping area 50c which is at the jaws 38 of the clamp 32 when the latter is in the low position and when the

cap 5Z is in the high position.

  Under these conditions, a transverse movement of the carriage 22 and, consequently, of the clamp 32 towards the marker 50 makes it possible to ensure the automatic gripping of the latter. In fact, when the bevelled ends of the gripping surfaces 38a come into contact with the gripping zone 50c of the marker, the jaws 38 are automatically spread apart against the action of the spring 42. The continuation of the movement of the carriage 22 bearing The clamp then has the effect of trapping the area 50c of the marker between the parts in an arc of a circle.

gripping surfaces 38a.

  The cap 52 is then retracted downwards under the action of the jack, to release the lower end 50a from the

  marker pen. Under these conditions, the tip 50b of the marker is located at the upper face of the material to be cut.

  To allow the marker 50 to be brought to the marking area, the excitation of the electromagnet 46 is therefore interrupted 20 in order to bring the tip 50b of the marker to a level located

  substantially above the upper face of the material.

  The marking is then carried out after excitation of the electromagnet 46, by combining the transverse displacements of the carriage 22 according to arrow F and the longitudinal displacements of the material according to arrow F. At the end of each trace,

  the excitation of the electromagnet 46 is interrupted.

  When the plots are finished, the operations which have just been described are carried out in reverse order

  to bring the marker back into its cap.

  In order to improve the contact between the material M to be cut and the belts 12 and 14, pressure rollers 60 are used located above the belts and only one of which is shown to simplify in FIG. 1. These pressure rollers, arranged transversely and whose axes 35 are horizontal, make it possible to eliminate relative sliding

  between the material and the belts.

  The rollers 60 are preferably retractable as illustrated in particular in FIG. 6. For this purpose, the rollers 60 are fixed at their ends on the ends of two levers 5 62 articulated around a horizontal axis 64 and whose

  opposite ends are connected to a jack 66. The shaft 64 and the body of the jack 66 are fixed to the frame 10 of the machine.

  The cylinder 64 allows both to apply the roller 60

  corresponding with some force on the material, and 10 to retract this roller when necessary.

  When the material to be cut has a notched edge, the machine is generally equipped over its entire length with a guide strip 68 (Figure 2) adjacent to one of the belts

side 12 and 14.

  In order to apply the edge of the material to be cut against this strip, the pressure roller 60 located near the inlet end 10b of the machine frame has its horizontal axis slightly inclined with respect to the transverse direction corresponding to the arrow F. More precisely, the end of this roller 60 adjacent to the strip 68 is closer to the inlet end 10b of the frame than the opposite end of this roller 60. When the material advances on the toothed belts 12 (arrow F '), this particular arrangement of the roller 60 located at the entrance to the machine has the effect of applying a transverse force on the material _ directed towards the guide strip 68. The contact of the emarged edge of

  material with this strip is thus ensured.

  In accordance with an essential characteristic of the invention, the machine comprises interchangeable supply modules 30-70 on which the rolls of material M to be cut can be prepared in advance. An interchangeable module 70 will now be described in detail, in particular with reference to

in Figures 7 to 10.

  The supply module 70 comprises a rigid frame 72 72 resting on the ground for example by rollers 74 allowing its movement. This chassis 72 has a front face 72a intended to be placed opposite the inlet end 10a

of the machine frame.

  To allow the interchangeability of the module 70, it is connected to the frame 10 of the machine by disconnectable connection means also ensuring positioning

  side of the module with respect to the frame.

  In the embodiment shown in FIG. 8, these connection and positioning means comprise two magnetic suction cups 76 mounted on the front end 10a of the frame of the machine, opposite two metal plates 78 located on the front face 72a of the chassis of the power supply module 70. An electrical switch 80 also placed on the front end of the frame of the machine automatically controls the excitation 15 of the magnetic suction cups 76 when the front face of the chassis of the power supply module is brought into contact from the end

of the machine frame.

  As illustrated more precisely in FIG. 8, these disconnectable connection and positioning means 20 further comprise a centralizer 82 with a c8nic end, projecting from the inlet end 10a of the frame of the machine. When the module 70 is connected to the frame 10, this centralizer 82 penetrates into an oblong groove 84, oriented vertically, formed in the plate 78 placed opposite the centralizer 82. It should be noted that the lateral positioning thus got is

  sufficient to ensure satisfactory positioning of the feed cassette relative to the machine frame. In fact, the positioning in height is achieved by construction.

  On its upper face, the frame 72 of the supply cassette 70 forms a receptacle for the roll of material M to be cut. More precisely, the roll of material M is mounted on a mandrel of revolution 88, the ends of which rest on notches 86 in the form of a V constituting the receptacle. These notches are formed on side plates 90 projecting vertically upwards on the sides of the chassis 72, near the ends of the most

distant from the front face 72a.

  When the mandrel 88 is received in its receptacle, the end of the material M is arranged as illustrated.

  in particular Figures 7 and 9, so as to form a loop.

  Thus, the material M passes first over an idler roller 92, then under a movable tension roller 94, and finally over a second idler roller 96. The axes of the rollers 92, 94 and 96 10 are arranged transversely, parallel to the axis of the mandrel 88 when the latter is received on its receptacle. The axes of the rollers 92 and 96 are then located approximately at the same level as the axis of the mandrel 88, while the axis of the roller 94 is

  permanently located on a lower level.

  The ends of the tension roller 94 are housed in vertical grooves 98 (FIG. 8) formed on the lateral faces of the frame 72, so that it rests by gravity

  on material M to keep it permanently under tension.

  Beyond the roller 96, the end of the strip of material M is placed on the flat and horizontal upper face of a retractable support strip 100. The level of this upper face coincides with the level of the movable table formed

by belts 12 and 14.

  The slider 100 is supported by the frame 72 of the module 70 so as to be able to move horizontally in approach and away from the front face 72a on columns 102. As illustrated in particular in FIG. 9, when the module 70 is separated of the frame of the machine, springs 104 placed on the columns 102 hold the strip 100 apart 30 from the front face 72a of the chassis. Under these conditions, the front edge of the strip of material M is aligned with the front edge of

the strip 100.

  As can be seen in FIG. 10, the docking of the supply module 70 on the frame of the machine has the effect of pushing the strip 100 towards the front face 72a, against the springs 104. The end of The strip of material M is thus progressively engaged on the end of the series of

belts 12.

  When the operator sets up the strip of material M 5 in the manner which has just been described, it aligns the emarged edge

  of material on Side guides 106 (Figure 7). To ensure the maintenance of the material in this position until the machine is started, after the supply module has approached, the latter is also equipped with means for pinching the material.

  In the embodiment shown in FIGS. 7, 9 and 10, these pinching means comprise a horizontal transverse arm 108 whose ends are fixed on levers 110 articulated at 112 on parts of the vertical plates 90 15 projecting upwards between the rollers 92 and 96. On its underside, the transverse arm 108 carries pads 114,

  by means of swiveling connections.

  As illustrated in particular in FIG. 9, the pads 114 normally rest by gravity on the material M, so that the latter is pinched between the pads 114 and a horizontal bearing face of the frame 72 immediately adjacent to the front face

72a of the latter.

  As can be seen in FIG. 10, when the supply module 70 is docked on the machine frame, the pads 114 are moved away from the strip material M under the action of a jack 116 mounted in the frame 10 of the machine. More specifically, the jack 116 is equipped with a push rod 116a projecting vertically upwards so as to raise one of the levers 110 When the jack is actuated. The end of the material M is then released and this material can be brought

  to the cutting station 18 by the conveyor belts 12.

  Simultaneously, the advancement of the strip material M is ensured by an engine assembly 118 (FIGS. 2 and 7) mounted on an auxiliary frame 120 rigidly connected to the frame 10 of the machine. 35 This additional chassis 120 is disposed on the side of the power supply module 70 When the latter is connected to the frame, so that the output shaft of the motor assembly 118 is then aligned with the axis of the mandrel 88 bearing The roll of strip material M. The motor assembly 118 comprises a motor-122 controlling the rotation of a pneumatic clutch 124 capable of being housed in a tubular end 88a formed for this purpose in the mandrel 88. The assembly motor 118 is supported by the auxiliary chassis 120 so as to be able to move transversely between a rear position shown in FIGS. 2 and 3, allowing the module 70 to be put in and out, and a position before drive, wherein the pneumatic clutch 124 is housed in the tubular end 88a of the mandrel. The movement of the motor assembly 118 is controlled by any suitable means shown diagrammatically at 126 on the

figure 7.

  In an automated control, the translation of the engine assembly 118 allowing the clutch 124 to be brought into the tubular end 88a, as well as the inflation of this clutch, takes place automatically after docking of the cassette

on the machine frame.

  In the same spirit, the different organs constituting

  the machine which has just been described can also be automated in order to allow particularly rapid and efficient operation.

  Preferably, the roller 94 ensuring the tension of the material M on the supply cassette can also be used to control the length of the unrolled strip and, consequently, the actuation of the motor 122. For this purpose, the end of the roller 30 94 adjacent to the auxiliary chassis 120 can come into contact with a low contact 128 requiring the engine to stop 122 or with a high contact 130 whose engagement, on the contrary, requires the implementation of the motor 122. These two contacts allow

  complete the automation of the machine.

  Of course, the movement of the supply cassette 70 between the station in which an operator ensures the placement of the material M in the manner described above with reference to FIGS. 3 and 5 and the docking of the cassette on the machine. can be done automatically. For example, the cassette may take the form of a wire-guided cart or

  use any other similar robotic moving technique.

  It is clear that the use of feed cassettes 70 in accordance with the invention makes it easier to change the material when the roll is finished. Indeed, the preparation of a cassette can be done in complete peace without penalizing the performance of the machine. On the contrary, this yield is significantly increased,

  as well as operating costs.

  Of course, the feed cassette 70 could be used in any other automatic machine ensuring the treatment and / or control of a roll material of any kind.

Claims (12)

  1. Automatic machine for processing a strip material (M), this machine comprising a frame (10) carrying at least one conveyor belt (12, 14) capable of moving the material in front at least. a station (18) carrying out said treatment, between an inlet end (10a) and an outlet end (10b) of the frame, a receptacle (86) being provided for receiving a roll of the material to be treated, close to the inlet end, characterized in that the receptacle (86) 10 is mounted on a chassis (72) of an interchangeable power supply module (70), one face (72a) of this chassis being able to be connected to the end input (10a) of the frame by disconnectable connection and positioning means (76 to 84), the chassis (72) of the supply module also carrying a retractable strip (100) for supporting the end of the material (M), said strip projecting from said face (72a) of the chassis under the action of elastic means (104), when the connection and positioning means are disconnected, as well as pinching means (108 to 114) for 20 keep the material close to the strip (100), means (116) for controlling the release of e these means of   pinch being mounted on the frame (10) of the machine.   2. Machine according to claim 1, characterized in that the connection and positioning means comprise 'magnetic suction cups (76) mounted at the inlet end (10a) of the frame, metal plates (78) placed in vis-à-vis these suction cups on said face (72a) of the chassis and an electric switch (80) for controlling the suction cups (76) mounted at the inlet end (10a) of the frame and the closing of which is controlled by a contact between said face (72a) of the chassis and the switch (80).   3. Machine according to any one of claims 1   and 2, characterized in that the connection and positioning means comprise at least one end centering device (82) 2 601346   c8nique mounted at the inlet end (10a) of the frame and at least one vertical oblong groove (84) formed on said face (72a)   of the chassis, facing the centralizer (82).   4. Machine according to any one of claims 2 5 and 3, characterized in that the clamping means comprise a   transverse arm (108) articulated by its ends on the chassis (72) of the power supply module, and pads (114) mounted on the transverse arm by means of swivel connections, so as to be applied by gravity to the material (M) when the connection and positioning means (76 to 84) are disconnected. 5. Machine according to claim 4, characterized in that the means for controlling the release of the clamping means (108 to 114) comprise at least one pusher (116a) capable of lifting the transverse arm (108) when the means of   connection and positioning (76 to 84) are connected.   6. Machine according to any one of claims 1   to 5, characterized in that the roll of material (M) is mounted on a mandrel (88) having a tubular end (88a), the machine further comprising an auxiliary frame (120) connected to the frame (10) and arranged on the side of the power supply module (70) when the connection and positioning means (76 to 84) are connected, this auxiliary chassis carrying a motor assembly (118) including a pneumatic clutch (124) capable of being introduced into the tubular end (88a) of the mandrel under the action of translation means (126) by which this motor assembly   (118) is mounted on the auxiliary chassis (120).   7. Machine according to claim 6, characterized in that the frame (72) of the supply module (70) carries a transverse roller (94) for tensioning the material (M), capable of being received in a loop of the material formed between the roll of material received on the receptacle (86) and the clamping means (108 to 114), this roll moving by gravity in vertical guides (98) formed in the chassis (72) of the supply module , high and low limit switches 2b0 1 3 4 6 18 2601346   (130, 128) being mounted on the auxiliary chassis (120).   8. Machine according to any one of the claims   , characterized in that the b ti (10) of the machine carries, near its inlet end (10a), at least one pressure roller (60) with an axis slightly inclined with respect to a direction (F2 ) transverse to the direction of movement (F1) of the belt (12, 14), so as to apply to the material (M) a transverse force (t) directed towards a lateral guide (68) carried by the frame (10).   9. Machine according to any one of the claims   above, for cutting said material, this machine comprising a cutting tool (30) carried by a carriage (22) movable in a direction (F) transverse to the direction of movement (F) of the belt (12, 14 ), Characterized in that it further comprises means (32, 50) for marking the material (M) also carried by the carriage mobile (22).   10. Machine according to claim 9, characterized in that the marking means comprise a gripper 20 (32) mounted on the mobile carriage (22) by means (44 to 48) for moving the gripper between a high position and low position, a marker (50), and a cap (52) carried by the frame (10) and into which can be fitted an active end (50a) of the marker, the latter further comprising an area grip (50c) able to be fitted into said pliers (32).   11. Machine according to claim 10, characterized in that the cap (52) is mounted in the frame (10) by means (56, 58) for moving this cap 30 between a low retracted position and a high position in which the gripping area (50c) is at the level of the clamp   (32), when the latter is in the low position.   12. Machine according to any one of claims 10 and 11, characterized in that the clamp (32) comprises two articulated jaws (38), normally maintained in the closed position by elastic means (42).