FR2679105A1 - Machine for wrapping round bales of fodder - Google Patents

Abstract

It includes a fixed chassis (2), a turntable (3) mounted on the fixed chassis, a fixed device (4) for paying out wrapping film, a film-clamp assembly (20) secured to the turntable (3), including a clamp (gripper) and a mechanism for controlling the clamp, a crook element (21) mounted so as to move vertically on a fixed element (80), a cutter (knife) carried by the film-clamp assembly, and a ramp (23) mounted on a fixed element.

Description

 The invention relates to a machine for wrapping round bales of fodder.

 We know that there are machines generally called "round balers", which pick up straw, hay and, more generally, all kinds of cut plants called here for convenience "fodder", and which condition this fodder in the form of cylinders generally called "round bales". To keep these round bales, different methods are used, including the sealed packaging of the bales with a plastic film.

 Already known, in particular by French patent 2,636,041 or by PCT patent 88/03896, a machine for making such packaging which comprises a fixed frame, a turntable mounted on the fixed frame, and a fixed reel of film of 'packaging. The machine is designed so that a ball to be packaged is arranged horizontally on the turntable, and so that it is packaged therein being progressively surrounded by the film, the turntable being for this purpose being driven in rotation around a vertical axis passing through the center of the ball, while at the same time slowly rotating the ball on itself around its axis of symmetry.

 The present invention aims to facilitate the start and end of packaging operations for a bale.

To this end, it offers a machine of the aforementioned type, where the turntable takes, outside of the packaging operations, a predetermined rest position with respect to the chassis, the packaging film being approximately flat and vertical in its portion located between the dispenser and the packing bale, the machine being characterized in that it further comprises
- a film clamp assembly, integral with the turntable, comprising a clamp and a clamp control mechanism adopting two stable configurations where the clamp is respectively open and closed, the clamp being located in the upper part of the assembly and positioned for that its inlet, when open, is located under the packaging film in its portion between the reel and a packaging bale, when the turntable is in the rest position after packaging of the bale, the control mechanism of the forceps comprising a vertically movable rod, the lowering of which causes the forceps to close, and a hook which hooks automatically at the end of a forceps closing operation to keep it closed, its detachment causing the opening of the clamp
- a stock mounted vertically movable on a fixed element, a fork and a shoe carried by the stock, and means for driving the stock to raise or lower it, the stock being arranged, when it is raised and the turntable is in the rest position after wrapping a bale, transversely above the packaging film in the portion of the latter located between the reel and the packaging bale, with the fork above the film and in look of said clamp, and the shoe opposite a tip located at the upper end of said rod, the stock being adapted, by lowering after wrapping a bale, so that the fork gathers the film in a bead that '' it brings between the jaws of the clamp while the shoe lowers the rod by cooperating with the tip of the latter so as to close the clamp on the film gathered in a cord
- A knife carried by the clamp-film assembly, and knife drive means, linked to the clamp, adapted so that the knife takes, when the clamp is open, an armed position where a spring which requests it is bandaged, that the knife keeps this position until the clamp is closed enough to hold the film, and that the knife is then released and launched by the spring on a predetermined path on the path of which it cuts the film between gripper and bale packaging;
- A ramp mounted on a fixed element, located on the path traveled by the hook of the clamp control mechanism when the turntable is set in motion, adapted to cooperate with said hook to unlock it after the turntable has turned a predetermined angle from the rest position.

 Thus, once the packaging of the bale is finished with the turntable in the rest position, the stock is lowered, and at the end of movement the film is clamped in the clamp and cut between the clamp and the ball. After raising the stock, the packaging ball is conventionally unloaded by tilting the turntable around a longitudinal lateral axis, then the plate is brought back to the horizontal and a new ball is deposited there. We then launch the turntable, and thanks to the clamp which has remained closed, the film is immediately driven and begins to surround the ball. When the plate has turned by the predetermined angle, the ramp cooperates with the hook to unlock it and the clamp opens, which releases the film, the predetermined angle being chosen large enough so that the film has already sufficiently surrounded the ball so that it remains there, the film then being pulled directly by the ball during packaging. At the same time as the clamp opened, the rod is raised and the knife is armed, so that one is ready to repeat the above operations from the moment the packaging of the bale is finished.

 We can see that the operator no longer has to intervene directly on the film at the start and at the end of the wrapping operations for a bale, he just needs, before ejecting the bale, whose packaging is finished, to act on the drive means of the stick in order to lower and raise it, which is particularly easy.

 It is also possible to provide a single control lever actuating an automation first controlling a lowering and raising of the stock, then the tilting and the flat return of the turntable.

The description of the invention will now be continued with the description of an exemplary embodiment, given below by way of illustration and without limitation, with reference to the appended drawings. On these
- Figure 1 is a perspective view showing a machine according to the invention with a bale being wrapped
- Figure 2 is a partial view showing the left part of Figure 1, enlarged and in elevation;
- Figure 3 shows similarly to Figure 2 the upper part of the film clamp assembly, seen from behind
- Figures 4 to 6 illustrate in a similar manner to Figures 1 to 3 the machine with the packing ball, the turntable in the rest position, and the stock lowered with the film clamped in the clamp and cut
- Figure 7 is a top view of a pallet fixed to the chassis of the machine opposite the reel
- Figure 8 is a corresponding elevational view, the ramp of the pallet being in the lowered position
- Figure 9 is a similar view, the ramp being in the raised position
- Figure 10 is a view similar to Figure 8 of a variant pallet; and
- Figure 17 is the section marked XX in Figure 9.

 The machine 1 illustrated in the drawings comprises a fixed frame 2, a turntable 3 mounted on the frame 2 and a fixed reel 4 of packaging film 5.

 The chassis comprises an outer frame 6 of generally rectangular shape and feet 7 resting on the ground. The turntable 3 is mounted on elements of the chassis 2 internal to the frame 6 (not visible in the drawings), it comprises two end crosspieces 8A and 8B between which are mounted rollers 9 adapted so that a ball 10 to pack is arranged horizontally as shown. The reel 4 is carried by an upright It disposed transversely at the end of a bar 12 secured to the outer frame 6, the bar 12 being in the extension of an end cross member of the frame 6, the reel 4 comprising a support with an axis vertical for a roll 13 of packaging film, and a film tensioning device 14, here with three rolls, the film 5 leaving the reel being oriented vertically.

 The ball 10 resting on the turntable 3 is packaged by being progressively surrounded by the film 5, the turntable being for this purpose driven in rotation about a vertical axis passing through the center of the ball 10 while it at the same time, thanks to the rollers 9, turn the ball on itself around its axis of symmetry. Here the turntable is driven around the vertical axis clockwise when viewed from above, and the ball is driven around its axis clockwise when it is viewed from the front of the machine, as in Figures 1 and 4.

 When the packaging of the bale is finished, the turntable 3 takes with respect to the chassis 2 the position illustrated in FIG. 4, called the rest position, or it is roughly superimposed on the outer frame 6, with the cross member end 8A on the front side of the machine, and cross member 8B on the rear side. In this position where the packaging is finished, the portion of the film 5 situated between the reel 4 and the wrapped bale 10 is configured in a similar manner to that illustrated in FIG. 1, that is to say it is roughly flat and vertical.

 The description, made in support of the drawings, which precedes targets well-known elements, in particular by the abovementioned patent publications, elements which therefore do not need to be described in more detail.

 According to 1 invention, the machine 1 comprises a film clamp assembly 20 secured to the turntable 3, a stock 21 mounted vertically movable on a support secured to the chassis 2, a knife 22 (not shown in Figures 1 and 4) carried by the film clamp assembly 20, and a ramp 23 mounted on the chassis 2.

 The film clamp assembly 20 comprises a horizontal bar 30 mounted on the end cross member 8A of the turntable, an upright 31 fixed transversely to the end of the bar 30 so as to be disposed vertically, a clamp 32 disposed at the top of the upright 31, and a clamp control mechanism adopting two stable configurations where the clamp is respectively open (Figures 1 to 3) and closed (Figures 4 to 6).

 The clamp 32 comprises a movable jaw constituted by a plate 33, and a fixed jaw, arranged in the extension of the upright 31, constituted by a support plate 34 integral with the upright 31, by a damping plate 35 and by springs 36 binder the plates 34 and 35. The inlet of the clamp 32, when open, is located under the packaging film, in its portion between the reel 4 and the wrapped bale 10, when the turntable 3 is in position rest after packing the bale (see Figures 1 and 2, where certainly the packaging operation is in progress, but where the plate 3 is positioned as in the rest position).

 To thus adjust the position of the clamp 32, the mounting means 37 of the bar 30 on the end cross member 8A, are provided to allow adjustment of the position of the bar along the cross member.

 The control mechanism of the clamp 32, and more precisely of the movable jaw 33, comprises a sector 37 which carries the jaw 33 along one end and which is articulated around an axis 38, an arm 39 articulated at a end on sector 37 and at the other end on a lever 40 which is articulated at the other end on a rod 41 mounted to slide vertically in guides 42 and 43 secured respectively to the upright 31 and the bar 30, l articulation of the rod 41 on the lever 40 being made here by a double angle fitting 44 of which one end is welded on the rod 41, the lever 40 being articulated between its two articulations with the arm 30 and the rod 41, on a horizontal tab 45 integral with the upright 31. A tension spring 46 is provided between the bar 30 and the sector 37, so that the spring 46 tends to open the clamp 32. A hook 47 articulated at its top on a lug 48 integral with the bar 30, has a ramp 49 and a notch 50 adapted to cooperate with a pin 51 secured to the lever 40, a spring 52 disposed between the upright 31 and the hook 47 urging the latter toward the upright 31. A curved extension of the lever 40, beyond its articulation with the arm 39 , carries a roller 53, while a tee 54 is welded by its foot to the end of the connector 44.

 In the open position of the clamp (Figures 1 to 3), held by the spring 46, the plate 55 which borders the second end of the sector 37, is in abutment against the upright 31, the lever 40 is inclined with the roller 53 in lowest position, the ramp 49 of the hook 47 is supported on the pin 51 under the effect of the spring 52, and the rod 41 is in the raised position.

 If, from this position, the rod 41 is lowered by overcoming the resistance due to the spring 46, then the lever 40 will pivot around its articulation with the tab 45, until it becomes more or less horizontal, the arm 39 will mount and rotate the sector 37 so that the plate 33 is brought against the plate 35, and the pin 51 will progress along the ramp 49 until it engages in the notch 50 where it remains held in place by the spring 52 which requests the hook 47 in the desired manner (see in particular Figure 5).

 Thus, the hook 47 is automatically hooked at the end of a clamp closing operation and blocks the mechanism in its position where the clamp is closed.

 It will be noted that if the hook 47 is removed from the pin 50 at this time, then the clamp will automatically move to the open position under the effect of the spring 46, the entire control mechanism then taking the corresponding position.

 It will also be observed that in the closed position of the clamp, the tee 54 is lower than the lower end of the hook 47.

 In addition, in order to allow adjustments, an arm 39 with adjustable length was used.

 The knife 22 is articulated around the same axis (geometrical) 38 as the sector 37, but can rotate around this axis independently of the sector. A spiral spring (not visible in the figures) is arranged coaxially so as to be bandaged in the position it takes when the clamp is open (see Figures 2 and 3), that is to say that the knife is armed in this position. An angle iron 60 with round section is integral with the knife, with its straight portion parallel to sector 37 and the end of its curved portion engaged in a lumen 61 of sector 37, lumen which describes a portion of a circle centered on the axis 38. A hook 62 is articulated by its base on a horizontal tab 63 integral with the upright 31, and a spring 64 disposed between the hook 63 and the upright 31 urges the hook towards the angle iron 60. When the clamp is open (see FIG. 3), the angle 60 is in abutment on the upper end of the lumen 61 while it is engaged in the notch 65 of the hook 62. When the sector 37 rotates to close the clamp 32, the knife 22 remains locked in the armed position, the hook 62 remaining in place, while the lumen 61 moves relative to the end of the angle iron 60 which is engaged therein. At a predetermined time (see below), the finger 66 fixed in the slot 61 releases the angle 62 from the hook 62, and therefore the knife, which is then launched by the spiral spring on a path ending in the position illustrated in Figures 5 and 6, where the end of the angle 60 engaged in the slot 61, is again in abutment at the upper end of the slot. Thus, when the sector 37 will rotate when the clamp 32 opens, the knife 22 will be driven to the armed position shown in FIGS. 2 and 3. Here, the finger 66 is fixed in the lumen with hexagonal nuts, so that you can adjust your positioning precisely.

 The ramp 23 is part of a pallet 70 mounted on the frame 6 of the chassis 2 approximately in the angle transversely opposite to the reel 4, so as to be located on the path traveled by the hook 47 when the plate 3 rotates around of the vertical axis passing approximately through the middle of the ball 10.

 The pallet 70 comprises: a support plate 71 having approximately the same length as the ramp 23, but a little more parge (see FIG. 7); a fastener 72 secured to the plate 71 and bolted to the chassis 6; a joint 73 between the plate 71 and the ramp 23, located at the foot of the ramp; a spring 74 disposed between the plate 71 and the ramp 23, tending to cause the ramp to rise relative to the plate 71; a hook 75 with a generally vertical orientation, articulated at its lower part so as to be movable parallel to the ramp, on the side of the plate 71 which is not covered by the ramp 23; a rod 76 welded horizontally and transversely under the ramp with one end which protrudes from the ramp to come opposite the hook 75, and a spring 77 between the hook 75 and the plate 71, urging the hook towards the rod 76, a notch 78 (see FIG. 9) adapted to cooperate with the rod 76 being provided on the hook 75 so that the ramp is kept in the lowered position (FIG. 8), position in which the upper end of the hook 75 protrudes above the ramp 23.

 We see that if we push the top of the hook 75 to the left (looking at the pallet as in Figure 8), then the rod 76 is released and the ramp goes to the raised position shown in Figure 9, under l 'Effect of the spring 74, and if we then lower the ramp to engage the rod 76 in the notch 78, then the ramp will remain in the lowered position (Figure 8).

 The lower part of the clamp-film assembly 20 is adapted to cooperate with the pallet 70 in the following manner, when the clamp is closed (see in particular FIG. 5): after approximately three quarters of a turn of the plate 3 from the rest position, this lower part passes over the pallet 70 whose ramp is in the lowered position. The roller 53, the ramp 49 of the hook 47 and the tee 54 pass over the ramp 23 without meeting it, but the tee 54 meets the end of the hook 75, so that the rod 76 is released, and the pallet passes in the raised ramp position shown in FIG. 9. On the next turn of the turntable, the ramp 49 of the hook 47 meets the ramp 23 of the pallet, the clamp control mechanism 32 is unlocked, and the assembly 20 switches to the position illustrated in Figure 2, where the roller 53 becomes the lowest part. In the next turn, the roller 53 will lower the ramp 23 which will then remain locked in the lowered position thanks to the hook 75.

 Thus, the ramp 23 automatically unlocks the hook 47 when the plate 3 has rotated three quarters of a turn from the rest position.

 In the variant 70 'of the pallet, illustrated in FIGS. 10 and 11, the plate 71 is replaced by a plate 71' similar to the plate 71, but connected by springs 79 to an additional plate 71 "to which is fixed the 'fastener 72. With the springs 79, the tolerance for height adjustment of the pallet 70 is increased, and above all one compensates for the variations in height of the assembly 20, due to the more or less accentuated buckling of the plate 3 depending on the how the ball was positioned there 10.

 The stick 21 is mounted vertically movable on a fixed base 80 secured to the upright 11, by means of a hydraulic cylinder 81 oriented vertically, mounted by its foot on the base 80 while at the end of its rod 82 is mounted the stick 21, which carries a fork 83 and a shoe 84.

 When the butt 21 is raised, that is to say that the rod 82 is out, and that the turntable 3 is at rest after wrapping a bale, the butt 21 is arranged transversely above the film 5 in its portion between the reel 4 and the wrapped bale 10, with the fork 83 above the film 5 and opposite the clamp 32, the shoe 84 being opposite a nozzle 85 located at the upper end of the rod 41.

 When the fork 21 is lowered from this position, by bringing in the rod 82 of the jack 81, the fork 83 gathers the film 5 into a cord which it brings between the jaws of the clamp 32 while the shoe 84 lowers the rod 41 cooperating with the end piece 85 thereof so as to close the clamp 32 on the film gathered in a cord, and when the clamp is closed enough to hold the film, the knife 22 is released thanks to the pin 66 correctly positioned, and it is launched by the spiral spring, its path being provided so that along the way it cuts film, gathered in a cord, between the clamp 32 and the ball 10. We are then in the position illustrated in the figures 4 to 6.

Then, the rod 82 is taken out of the jack 81, the assembly 20 remains in the position illustrated in FIGS. 4 to 6, the plate 3 is tilted around a longitudinal lateral axis located approximately below the roller 9 which can be seen on the right in FIGS. 1 and 4, and when the bale has been ejected from the machine, the tray 3 is brought back to its horizontal position, a new bale 10 to be packed is placed on the tray, and the turntable
Thanks to the clamp 32 which has remained closed, the film 5 is immediately driven and begins to surround the new ball 10. When the plate has rotated by a quarter turn, the ramp 23 cooperates with the hook 47 to unlock it and the clamp 32 opens, which releases the film from the clamp, the film then being pulled directly by the bale during packaging. At the same time as the clamp 32 opened, the rod 41 is raised and the knife 22 is reset, and as in the following turn the pallet 23 is returned to the lowered position by the roller 53, we are directly ready to renew the above operations when the packaging of the bale has been completed.

 To limit the damage which could occur if the tilting plate is tilted in order to eject the ball without having raised the stick 21, that is to say directly from the position shown in FIG. 5 , a safety mounting has been provided at the base of the stock 21, comprising a yoke 90 with respect to which the rest of the stock is articulated around the axis 91, a safety pin 92 being provided for blocking the stock: in case we turn the turntable, it is only the pin that will break, and the stick will rotate around the axis 91.

 It will be noted that in order to pack the first bale, the film can be collected yourself into a cord which is engaged in the open clamp, and then the latter is closed by lowering the butt 21.

 Finally, it should be noted that many variants are possible.

 For example, the pallet 70 described can be replaced by any pallet where a ramp admits a lowered position in which the hook 47 does not meet it, and a raised position where it is adapted to unlock the hook, the pallet and the lower part of the film clamp assembly 20 being adapted so that, if the clamp control mechanism 32 is in the configuration where the clamp is closed, and the pallet in the configuration where the ramp is lowered, the latter will pass to the raised position after a passage of the film clamp assembly above the ramp, so that on the second passage the hook will be unlocked; while the lower part of the film clamp assembly 20 and the pallet would also be adapted so that, if the clamp control mechanism is in the configuration where the clamp is open and the pallet with the ramp raised, then the ramp will be brought to the lowered position when the film clamp assembly passes over the pallet.

 The pallet 70 is positioned so that the clamp opens after three quarters of a turn of the turntable, but by positioning the pallet differently, this predetermined angle could be varied between one turn and two turns.

 One can also replace the sector 37 by a support having the same function but a different shape, and replace the springs 46 and 52 by spiral springs.

 More generally, the invention is not limited to the exemplary embodiment described and shown in the drawings, but on the contrary encompasses all the variants that a person skilled in the art can determine.

Claims (10)

 1. Machine for packing round bales of fodder (10), comprising a fixed frame (2), a turntable (3) mounted on the fixed frame, and a fixed reel (4) of packaging film (5); adapted so that a ball to be packaged (10) is arranged horizontally on the turntable (3), and so that it is packed therein being progressively surrounded by the film (5), the turntable being for this purpose driven in rotation about a vertical axis passing through the center of the ball, while at the same time slowly rotating the ball on itself around its axis of symmetry, the turntable taking outside the operations of packaging a predetermined rest position relative to the frame, the packaging film being approximately flat and vertical in its portion located between the reel (4) and the wrapped bale (10); machine characterized in that it further comprises  - a film clamp assembly (20), integral with the turntable (3), comprising a clamp (32) and a clamp control mechanism adopting two stable configurations where the clamp is respectively open and closed, the clamp being located in upper part of the assembly and positioned so that its inlet, when open, is located under the packaging film (5) in its portion between the reel and a wrapped bale, when the turntable is in the rest position after wrapping the bale, the gripper control mechanism comprising a rod (41) movable vertically, the lowering of which causes the gripper (32) to close, and a hook (47) which hooks automatically at the end an operation to close the clamp to keep it closed, its detachment causing the opening of the clamp  - a stock (21) mounted vertically movable on a fixed element (80), a fork (83) and a shoe (84) carried by the stock, and means (81) for driving the stock to raise it or the '' lower, the stick being arranged, when it is raised and the turntable is in the rest position after wrapping a bale, transversely above the wrapping film in the portion thereof located between the reel and the wrapped bale, with the fork (83) above the film (5) and facing said clamp (32), and the shoe facing an end piece (85) located at the upper end of said rod (41), the stock (21) being adapted, by lowering after wrapping a bale, so that the fork (83) gathers the film (5) in a cord which it brings between the jaws of the clamp (32 ) while the shoe (84) lowers the rod (41) by cooperating with the end piece thereof so as to close the clamp on the film gathered in a bead  - A knife (22) carried by the clamp-film assembly (20), and knife drive means, linked to the clamp, adapted so that the knife takes, when the clamp is open, an armed position where a spring who requests it is bandaged, the knife keeps this position until the clamp is closed enough to hold the film, and that the knife is then released and launched by the spring on a predetermined path on the course from which he cuts the film between the gripper and the wrapped bale  - A ramp (23) mounted on a fixed element (6), located on the path traveled by the hook (47) of the clamp control mechanism when the turntable is set in motion, adapted to cooperate with said hook for the unlock after the table has rotated by a predetermined angle from the rest position.  2. Machine according to claim 1, characterized in that the film clamp assembly (20) comprises a horizontal bar (30) mounted on an end crosspiece (8A) of the turntable (3), an upright (31) fixed transversely to the end of said bar (30) so as to be arranged vertically, the clamp (32) being disposed at the top of the upright (31).  3. Machine according to claim 2, characterized in that the clamp (32) comprises a movable jaw constituted by a plate (33), and a fixed jaw arranged in the extension of the upright (31), constituted by a support plate (34 ) integral with the upright (31), by a damping plate (35) and by springs (36) connecting the support plate (34) and the damping plate (35).  4. Machine according to any one of claims 1 to 3, characterized in that the clamp control mechanism (32) comprises an articulated support (37) of a jaw (33) of the clamp, an arm (39 ) articulated at one end on the support (37) and at the other end on a lever (40) which is articulated at the other end on said rod (41) which is mounted to slide vertically, the lever (40) being pivotally mounted between its two articulations respectively with the arm (30) and the rod (41), a spring (46) being provided for urging the clamp in the opening direction, said hook (47) being urged by a spring ( 52) and comprising a ramp (49) and a notch (50) adapted to cooperate with a pin (51) integral with the lever (40) so that, during an operation of closing the clamp (32), the pin (51 ) slides on the ramp (49) until it engages in the notch (50) where it remains blocked.  5. Machine according to any one of claims 1 to 4, characterized in that the knife (22) is articulated, a spiral resort being arranged coaxially so as to be bandaged in the position that the knife takes when the clamp (32) is open, an angle iron (60) being integral with the knife (22) with a straight portion parallel to a support (37) of a jaw (33) of the forceps which is articulated coaxially but independently of the knife, and a curved portion of which the tip forms a finger engaged in a slot (61) of said support (37), this slot describing a portion of a circle centered on the axis of articulation (38) of the knife and the support, a hook (62) being articulated by its base and biased by a spring (64) towards the angle iron (60), so that when the clamp (32) is open, the angle iron (60) is in abutment on the upper end of the light (61) while '' it is engaged in a notch (65) of the hook (62), only when the support (37) turns to close the clamp (32), the knife (22) remains locked in the armed position, the hook (62) remaining in place, while the light (61) moves relative to the end of the angle iron which there is engaged, and that at a predetermined moment a finger (66) releases from the hook (62) the angle iron (60) and therefore the knife, which is then launched by the spiral spring on a path ending in a position where the end of the angle iron (60) engaged in the lumen (61) is again in abutment at the upper end of the lumen.  6. Machine according to any one of claims 1 to 5, characterized in that said predetermined angle at the end of which the ramp (23) unlocks the hook (47) is greater than one turn and less than two turns, the ramp being part a pallet (70) where it accepts a lowered position in which said hook (47) does not meet it, and a raised position where it is adapted to unlock the hook, the pallet and the lower part of the clamp assembly film (20), lower part which is part of the clamp control mechanism, being adapted so that, if the mechanism is in the configuration where the clamp is closed and the pallet in the configuration where the ramp is lowered, this it will move to the raised position after one pass of the film clamp assembly above it, so that on the second pass, the hook will be unlocked.  7. Machine according to claim 6, characterized in that the lower part of the film clamp assembly (20) and the pallet (70) are further adapted so that, if the mechanism is in the configuration where the clamp is open and the pallet with the ramp (23) raised, then the ramp will be brought to the lowered position when the film clamp assembly passes over the pallet.  8. Machine according to any one of claims 6 or 7, characterized in that said predetermined angle is one quarter turn, the pallet being arranged three quarters of a turn from the rest position.  9. Machine according to any one of claims 1 to 8, characterized in that the stick (21) is mounted vertically movable on a fixed base (80) integral with an upright (11) on which is fixed the reel (4 ), a vertically oriented hydraulic cylinder (81) is mounted by its foot on the base (80) while at the end of its rod (82) is mounted the stock (21).  10. Machine according to any one of claims 1 to 9, characterized in that the stock comprises a safety assembly, comprising a yoke (90) relative to which the rest of the stock is articulated, and a locking pin ( 92), the safety mounting being adapted so that in the event that the turntable is tilted around a longitudinal lateral axis without having raised the stick, it is only the pin that breaks, the stick turning around the axis (91) of the yoke.