FR3091862A1 - Device for supporting rolls of printable material with support elements adjustable in translation - Google Patents

Abstract

Device for supporting rolls of printable material with support elements adjustable in translation The invention relates to a device (1) for supporting rolls (2) of printable material carried by first and second support elements (4, 5; 10, 10a, 5) spaced apart and each associated with a longitudinal end of the roller by carrying a cylindrical sleeve (5) penetrating into the longitudinal end, the first support elements (4, 5) being in the form of a single disc (4 ) carrying the cylindrical sleeves (5) and driven in rotation. The second support elements (10, 10a, 5) are independent and are each in the form of an arm (10, 10a) comprising, at a free end, the associated cylindrical sleeve (5), each arm (10, 10a ) being sliding along a beam (8) parallel to the rollers (2) and comprising a removable locking means (6) in position of the arm (10, 10a) relative to the beam (8) driven in rotation by the manual means (7) or by motor means. Figure to be published with abstract: Fig.1]

Description

Device for supporting rolls of printable material with support elements adjustable in translation

Technical field of the invention

The present invention relates to a device for supporting several rolls of printable material with support elements adjustable in translation. Each roller is carried by first and second support elements of the device spaced apart from each other and each associated with a respective longitudinal end of the roller.

Each support element carries a cylindrical sleeve penetrating the respective longitudinal end of the roller for its maintenance between the first and second support elements.

The first support elements at the longitudinal ends on the same side of the rollers are in the form of a single disc carrying the cylindrical sleeves and driven in rotation by manual means or by motor means.

Prior art

According to the state of the art, there is known a device for supporting several rolls of printable material comprising first and second vertical support elements spaced from each other.

One of the support elements is the motor element of the first and second support elements by being driven directly in rotation by motor means. The other support element is the element driven in rotation by the motor support element via a mechanism.

Each support element comprises a plurality of discs, each disc, arranged on a support element, being opposite a respective disc of the discs arranged on the other support element. Each disc is mounted free in rotation on its support element, the first and second support elements being carried by a support frame resting on the ground.

The longitudinal ends of the rollers are respectively connected to a disc. It follows that it is impossible with such a device of the state of the art to have several rollers of different length carried simultaneously by the device.

Moreover and above all, the device of the state of the art is unable to be adapted to the support of different rolls of printable material by first carrying a set of rollers of the same length and then carrying a set rolls of another length.

However, it is important for such a support device to be able to accommodate rolls of printable material of different dimensions, in particular in length, in order to be adapted to the supply of different printing machines.

Indeed, the supply of a printing machine can be done just as well from behind the machine as from the front and in particular at different height levels.

EP-A-0509960 describes a storage device which comprises at least one storage device with a gripper and several roll cores and is used for the storage of material in the form of rolls, in particular for the storage of printed products in rolls. The gripper has a central element which is fixed to a transport device and which supports a gripping star.

The clamping arrangements for the clamping rolls at their periphery and the core support devices for gripping the individual roll cores or those which have been placed on top of each other, are arranged on the gripper.

Roll support devices supporting the clamped roll cores may be arranged on the central member. The mandrel support devices are movable or pivotable so that they can be moved away from the rolls to allow manipulation of each of the rolls.

The movements of the gripper parts are initiated by linear drives and monitored by sensors, so the gripper can operate fully automatically. Roll cores are essentially hollow cylinders, containing holding means therein, by which they are gripped by the core support devices and the roll support devices.

If this document shows rollers extending around a device, the assembly does not form a mobile carriage and cannot be transported, for example, from a reloading station to a supply station of a printing machine. .

Document WO-A-2010/137527 shows a printing machine with a newspaper offset web press comprising a sheet feeder, a printing machine, a guide device, a turn bar device and a bending machine. This document also shows a supply of a printing machine by three rolls of paper supported by a support with three arms.

The rollers can rotate relative to the center of the support. There is no indication that the support is movable, since the support device is ancillary to the printing machine claimed in this document and is not specifically the subject of this document.

The closest state of the art is represented by document FR-A-3 060 548 which describes a device with means for adjusting the length of the support of each roller by means of a sliding ring which can be locked in position, the rollers resting on tubes. The adjustment of the sliding ring and the presence of tubes has the disadvantage of increasing the total price of the device.

The problem underlying the present invention is to design a support device for printable rolls which can simultaneously carry several rolls while being mobile and adaptable to different printing machines, this device also having to be easily adaptable to different types of length of rolls of printable material.

To this end, the present invention relates to a device for supporting several rolls of printable material, each roll being carried by first and second support elements of the device spaced apart from each other and each associated with a respective longitudinal end of the roll. , each support element carrying a cylindrical sleeve penetrating into the respective longitudinal end of the roller for its maintenance between the first and second support element, the first support elements at the longitudinal ends on the same side of the rollers being in the form of a single disc bearing the cylindrical sleeves and driven in rotation by manual means or by motor means, characterized in that the second support elements are independent of each other and are each in the form of an arm comprising, at a free end, the associated cylindrical sleeve, each arm sliding along a beam extending parallel to ux rollers and comprising a removable means for locking the arm in position relative to the beam, the beam being driven in rotation by manual means or by motor means.

The technical effect is to make the printable material roll support device compatible with all printing machines. Printing machines may differ by their printable material supply inlet(s) most frequently arranged at the rear of the machine but also at the front of the machine, this being possible at heights different. Moreover, the rolls of printable material can be of different lengths.

According to the present invention, the support device can accommodate rolls of different lengths. This has been made possible by the use of second support elements respectively specific to a longitudinal end of a roll which are easily translatable to be adapted to the length of the associated roll and then locked in position.

Thus, instead of having a roller support device specifically dedicated to a printing machine, the support device according to the present invention can be adapted to all printing machines by simple adjustment of a second support means compared to a roll of printable material.

Another advantage of the present invention is that the support device can carry rolls of printable material of different lengths, the adaptation in length for a roll of printable material being done individually for each roll.

Advantageously, the device comprises first and second vertical frames spaced apart from each other and delimiting the device in length, the first frame carrying the disc of the first support elements, the beam being fixed at a respective longitudinal end to each of the first and second frame, being mounted free in rotation on a pivot relative to the second frame.

The motor means may be in the form of an electric motor driving a chain wound around a pinion of the disc from the first support elements and from the longitudinal end of the beam towards the first frame.

The beam connecting the two frames performs two different functions. First, this beam is used to adjust the second support elements taken individually. Secondly, this beam stiffens the device while allowing the driving of the second support elements.

The first and second frames can be carried by height-adjustable feet, being for example telescopic, the height adjustment being made by inserting one part into the other, a blocking means blocking the two parts one compared to the other.

This embodiment is very advantageous for making the support device compatible with different printing machines having their feed inlet at different levels of height. There is then the possibility of placing a first of the rolls as close as possible to this feed inlet, one end of the strip of the roll being unwound to be introduced into the feed inlet.

Advantageously, the beam is provided with longitudinal facets, each facet being associated with a respective second support element of a roller.

Advantageously, each arm is in the form of a bracket with a first branch of the bracket carrying the cylindrical sleeve at one free end and connected to a second branch of the bracket in the form of a base, a major part of which is supported at least partially against a facet of the beam, the first branch extending in a plane perpendicular to the base and transversely to the base.

Advantageously, each facet of the beam is hollowed out with at least one longitudinal groove, each base being crossed by at least one locking wheel, one head of which protrudes from the base opposite the beam and a free end penetrates into said au least one groove, the knob constituting the removable means for blocking the arm relative to the beam via its base.

Advantageously, each facet of the beam comprises an auxiliary guide groove parallel to said at least one groove and receiving two base centering studs.

Advantageously, each base is triangular in shape with an apex pointing towards the associated first support element.

Advantageously, the first frame, on a face external to the device, carries a crank as well as an indexer blocking the rotation of the disc or carries the drive means, a gear being inserted between, on the one hand, the drive means or the crank and , on the other hand, the disk and the beam being carried by one face of the first frame inside the device.

Advantageously, the first and second frames are mounted on rollers on their face facing the ground.

The support device is thus mobile and can be transported from a printing machine to a storage station for rolls of printable material for reloading.

As this support device is compatible with several types of printing machine, the support device can also be used successively to feed different printing machines, if necessary with different roll lengths.

Indeed, rollers of different lengths can be present on the same support device due to the individual adjustment of the adaptation of the support device for each roller, this adjustment being made by at least a second support element locked in friction on the beam once the setting has been adjusted.

The present invention relates to an assembly of a printing machine and a device for supplying support for several rolls of printable material at the input of the printing machine, characterized in that the device is as described above.

Advantageously, a lower end of each longitudinal face of the device carries a fixing lug inserting into a member of the printing machine for securing the device to the printing machine.

Advantageously, the fixing lug slides on a slide provided with two grooves, two sliding means carried by the fixing lug penetrating into a respective groove with locking in position of the sliding means by tightening.

The invention also relates to a method for feeding a printing machine by such a support device for rolls of printable material or for such an assembly, which method comprises the following steps:

- loading of the device by successive insertion of rollers carried by respective first and second support elements by adjusting each second support element to a length of the associated roller,

- blocking in the longitudinal position of each roller after displacement and blocking of its second associated support element,

- bringing the device in front of a supply inlet of the printing machine,

-rotation of the first support elements and of the beam so that a first roller carried by the device is arranged opposite the feed inlet of the printing machine and introduction by unwinding of an end of printable material from the first roll in the printing machine,

- when the printable material is consumed on the first roller, rotation of the first support elements and of the beam so that a second roller carried by the device is placed opposite the feed inlet of the printing machine and introduction of one end of printable material from the second roll into the printing machine,

- repeating the previous step for all the successive rolls carried by the device until the printable material carried by a last roll present on the device has run out,

- when the printable material of all the rolls is exhausted, movement of the device away from the printing machine for its reloading of rolls of printable material.

It is also possible to modify the succession of the steps, the loading of the device after adjustment of each second support element to a length of the associated roller and locking of the second associated support element can also be done after the device has been brought in front of an entrance. feeding the printing machine.

Thus, the same support device can carry several rolls of printable material and there is no longer any need for the operator to go and find replacement rolls. Time and cost savings are thus obtained.

After the device has been brought in front of a feed inlet of the printing machine, the support elements can be raised so that the end of the first roller is positioned opposite the printing machine feed input.

This makes it possible to work with the same support device for different printing machines, the height adjustment being easily operable.

Brief description of figures

Other characteristics, objects and advantages of the present invention will appear on reading the detailed description which follows and with regard to the appended drawings given by way of non-limiting examples and in which:

[Fig. 1] - Figure 1 is a schematic representation of a perspective view of an embodiment of a support device according to the present invention,

[Fig. 2] - Figure 2 is a schematic representation of a perspective view of an embodiment of a second support element of a roller forming part of a support device according to the present invention, the second element of support being enlarged compared to the second support elements shown in Figure 1.

It should be borne in mind that the figures are given by way of examples and do not limit the invention. They constitute schematic representations of principle intended to facilitate understanding of the invention and are not necessarily at the scale of practical applications. In particular, the dimensions of the various elements shown are not representative of reality.

Detailed description of the invention

Referring to all the figures and in particular to Figure 1, the present invention relates to a device 1 for supporting several rolls 2 of printable material.

This printable material can be paper, fabric or any substrate. In Figure 1, two rolls 2 of printable material are shown but the support device 1 can of course contain several rolls 2 simultaneously, for example three or four rolls or more.

In this device 1, each roller 2 is carried by first and second support elements 4, 5; 10, 10a, 5 of device 1 spaced apart and each associated with a respective longitudinal end of the roller.

Each support element 4, 5; 10, 10a, 5 carries a cylindrical sleeve 5 penetrating the respective longitudinal end of the roller 2 for its maintenance between the first and second support elements 4, 5; 10, 10a, 5. The cylindrical sleeve 5 may also have a collar abutting against a longitudinal end of a roller 2.

First support elements 4, 5 at the longitudinal ends of the same side of the rollers 2 are in the form of a single disc 4 carrying the cylindrical sleeves 5. This disc 4 is driven in rotation by manual means 7 or by medium motors.

In Figure 1, there is shown a crank 7 for manual drive of the disc 4, motor means not being illustrated but which may however be present in association with or replacing the crank 7.

The second support elements 10, 10a, 5 are independent of each other and are each in the form of an arm 10, 10a comprising, at one free end, the associated cylindrical sleeve 5. An arm 10, 10a is shown separately from the device in Figure 2.

Each arm 10, 10a is slidable along a beam 8 extending parallel to the rollers 2 for adjustment of the spacing between a first support element 4, 5 and a second support element 10, 10a, 5 corresponding exactly to the length of the roll.

Once the position of each second support element 10, 10a, 5 has been adjusted taking into account the length of the associated roller 2, the arm 10, 10a comprises a removable means 6 for locking the position of the arm 10, 10a in relation to the beam 8.

This beam 8 is driven in rotation by the manual means 7 or by the motor means, this advantageously by the manual means of rotation or the motor means of rotation of the disc 4 grouping together the first elements.

Each cylindrical sleeve 5 penetrates into a longitudinal end of the associated roller 2, presenting an outer diameter slightly smaller than the inner diameter of the roller.

Referring mainly to Figure 1, the device 1 may comprise first and second vertical frames 11, 13 spaced from each other and delimiting the device 1 in length.

The frames 11, 13 can be connected at their lower portion by two crosspieces 17 on each side of the device 1, to stiffen the device 1.

The first frame 11 can carry the disk 4 of the first support elements 4, 5. The beam 8 can be fixed at a respective longitudinal end to each of the first and second frames 11, 13, being mounted freely in rotation on a pivot by relative to the second frame 13, so that the beam 8 can be driven in rotation by the motor means or the manual means 7 for rotation, advantageously in association with the common disc 4 or all the first support elements 4, 5.

The beam 8 can be provided with longitudinal facets 9, each facet 9 being associated with a second support element 10, 10a, 5 respectively of a roller 2 and therefore with a specific roller 2. There are therefore at least as many facets 9 on beam 8 as rollers 2 but there may be more facets 9 on beam 8 of device 1 than rollers 2 then present.

Referring to figures 1 and 2, figure 2 showing an arm 10, 10a enlarged compared to the arms 10, 10a shown in the device 1 of figure 1, each arm 10, 10a can be in the form of a bracket. A first leg 10a of the bracket can carry the cylindrical sleeve 5 at one free end and be connected to a second leg 10 of the bracket.

This second branch 10 can be in the form of a relatively flat base 10, a major part of which bears at least partially against a facet 9 of the beam 8.

The first branch 10a can extend in a plane perpendicular to the base 10, this in a direction transverse to the base 10.

Referring again to Figures 1 and 2 taken in combination, for adjusting the position of a second support element 10, 10a, 5 so that this position corresponds to the length of the roller 2 that this second element supports, each facet 9 of beam 8 can be hollowed out with at least one longitudinal groove.

Each base 10 can be traversed by at least one blocking knob 6 of which a head, advantageously circular, protrudes from the base 10 opposite the beam 8 and a free end enters said at least one groove.

It is this wheel 6 which constitutes the removable locking means 6 of the arm 10, 10a with respect to the beam 8 via its base 10. A screwing of the wheel 6 pushes the free end into the said at least one groove and makes it come into abutment with the bottom of the groove.

In addition, each facet 9 of the beam 8 may include an auxiliary guide groove parallel to said at least one groove and receiving two centering studs 12 of the base 10, the studs being visible in Figure 2.

This allows the base 10 not to move unexpectedly by rotation around the knob 6, which could have happened even with the knob 6 tightened without the centering studs 12 of the base 10. The centering studs can also be tightened to reinforce blocking the base 10.

As best seen in Figure 2, each plinth 10 may be planar and triangular in shape with an apex pointing towards the associated first support member 4, 5. The axis of the cylindrical sleeve 5 can extend parallel to the plane of the base 10, the cylindrical sleeve 5 and the base 10 pointing in the same direction.

Referring more particularly to Figure 1, the first frame 11, on an exterior face to the device 1, carries a crank 7 as well as an indexer 3 blocking the rotation of the disc 4.

The crank 7 can drive a gear inserted between, on the one hand, the motor means or the crank 7 and, on the other hand, the disk 4 and the beam 8. This gear can be carried by a face of the first frame 11 inside to device 1.

The motor means, not shown in the figures, may be in the form of an electric motor driving a chain wound around a pinion of the disc of the first support elements as a gear. A reducer can also be provided.

In the case of the presence of motor means replacing or in combination with the crank 7, the motor means can be controlled by an operator by his action on a pedal.

This allows the operator to leave both hands free, for example when inserting one end of a roll 2 of printable material into a feed inlet of the printing machine.

Having a crank 7 in combination with motor means can be very useful in the event of breakdown or maintenance of the motor, the support device 1 not being out of service in such conditions.

The first and second frames 11, 13 can be mounted on rolling rollers 16 on their face facing the ground. The denomination roller 16 designates a wheel resting on the ground and its retaining cage.

There may be two rolling rollers 16 for the first 11 or the second frame 13. Usually, each rolling roller 16 can be carried in a cage that can also rotate in order to give more freedom of movement to one wheel of each pebble.

For adaptation to different printing machines having a printable material supply inlet at different levels, the height of the device 1 can be adjustable, advantageously by integrated telescopic means, for example between each first and second frame 11, 13 and a roller 16 rolling.

The telescopic means can be in two parts with one part penetrating into the other part. The height adjustment can therefore be made by inserting one part into the other part. A blocking means can block the two parts relative to each other, this means being able to be for example a pin or a key passing through the two parts transversely.

The present invention relates to an assembly of a printing machine and a device 1 for supplying support for several rolls 2 of printable material at the input of the printing machine as described above.

As visible in Figure 1, a lower end of each longitudinal face of the device 1 carries a fixing lug 14 inserted into a member of the printing machine for securing the device 1 to the printing machine.

The fixing lug 14, for example having a fork-shaped free end for inserting an element of the printing machine between two branches of the fork, can be slid on a slide 15 provided with two grooves.

In this case, two sliding means, for example two studs, carried by the fixing lug 14 can penetrate into a respective groove. These studs can have a head and can be tightened to obtain a blocking in position of the sliding means, once an adequate position of the fixing lug 14 has been obtained.

The invention also relates to a method of feeding a printing machine by such a device 1 for supporting rollers 2 of printable material or for such an assembly, which method comprises the following steps.

The first step is a loading of the device 1 by successive insertion of rollers 2 carried by first and second support elements 4, 5; 10, 10a, 5 respectively by adjusting each second support element 10, 10a, 5 to a length of the associated roller 2.

The second step is a locking in the longitudinal position of each roller 2 after displacement and locking of its associated second support element 10, 10a, 5.

The third step is a supply of the device 1 in front of a supply input of the printing machine.

The fourth step is a rotation of the first support elements 4, 5 and of the beam 8 so that a first roller 2 carried by the device 1 is arranged opposite the feed inlet of the printing machine.

This fourth step also includes an introduction by unwinding of an end of printable material from the first roll 2 into the printing machine.

When the printable material is consumed on the first roller, a fifth step provides for a rotation of the first support elements 4, 5 and of the beam 8 so that a second roller 2, carried by the device 1, is placed opposite the feed inlet of the printing machine and an introduction of one end of printable material from the second roller 2 into the printing machine.

Then, a sixth step concerns a repetition of the previous step for all the successive rollers 2 carried by the device 1 until the printable material carried by a last roller 2 present on the device 1 has run out.

When the printable material of all the rolls 2 is exhausted, the seventh step moves the device 1 away from the printing machine to reload it with rolls 2 of printable material.

The invention is in no way limited to the embodiments described and illustrated which have been given by way of examples only.

Claims (13)

Device (1) for supporting several rolls (2) of printable material, each roll (2) being carried by first and second support elements (4, 5; 10, 10a, 5) of the device (1) spaced apart each other and each associated with a respective longitudinal end of the roller, each support element (4, 5; 10, 10a, 5) carrying a cylindrical sleeve (5) penetrating into the respective longitudinal end of the roller (2) for its retention between the first and second support elements (4, 5; 10, 10a, 5), the second support elements (10, 10a, 5) being independent of each other and each being in the form of a arm (10, 10a) comprising, at one free end, the associated cylindrical sleeve (5), each arm (10, 10a) being sliding along a beam (8) extending parallel to the rollers (2) and comprising a locking means (6) in position of the arm (10, 10a) relative to the beam (8), the beam (8) being driven in rotation by motor means, because characterized in that the first support elements (4, 5) are placed at the longitudinal ends on the same side of the rollers (2) and are in the form of a single disc (4) carrying the cylindrical sleeves (5) and driven in rotation by manual means (7) alternately motor means, the locking means (6) being removable. Device (1) according to the preceding claim, which comprises first and second vertical frames (11, 13) spaced apart from each other and delimiting the device (1) in length, the first frame (11) carrying the disk ( 4) first support elements (4, 5), the beam (8) being fixed at a respective longitudinal end to each of the first and second frames (11, 13), being mounted free in rotation on a pivot relative to the second frame (13). Device (1) according to the preceding claim, in which the beam (8) is provided with longitudinal facets (9), each facet (9) being associated with a respective second support element (10, 10a, 5) of a roller (2). Device (1) according to the preceding claim, in which each arm (10, 10a) is in the form of a bracket with a first leg (10a) of the bracket carrying the cylindrical sleeve (5) at one free end and connected to a second arm (10) of the bracket in the form of a base (10), a major part of which bears at least partially against a facet (9) of the beam (8), the first arm (10a) extending in a plane perpendicular to the plinth (10) and transversely to the plinth (10). Device (1) according to the preceding claim, in which each facet (9) of the beam (8) is hollowed out with at least one longitudinal groove, each base (10) being traversed by at least one locking wheel (6) whose a head protrudes from the base (10) opposite the beam (8) and a free end penetrates into said at least one groove, the wheel (6) constituting the removable means for locking the arm (10, 10a) by relative to the beam (8) via its base (10). Device (1) according to the preceding claim, in which each facet (9) of the beam (8) comprises an auxiliary guide groove parallel to the said at least one groove and receiving two centering studs (12) of the base (10). Device (1) according to any one of Claims 4 to 6, in which each plinth (10) is triangular in shape with an apex pointing towards the associated first support element (4, 5). Device (1) according to any one of Claims 2 to 7, in which the first frame (11), on a face external to the device (1), carries a crank (7) as well as an indexer (3) blocking the rotation of the disc (4) or carries the motor means, a gear being inserted between, on the one hand, the motor means or the crank (7) and, on the other hand, the disc (4) and the beam (8) being carried by a face of the first frame (11) inside the device (1). Device (1) according to any one of Claims 2 to 8, in which the first and second frames (11, 13) are mounted on rollers (16) on their side facing the ground. Assembly of a printing machine and of a device (1) for supplying the support of several rolls (2) of printable material at the input of the printing machine, characterized in that the device (1) conforms to any of the preceding claims. Assembly according to the preceding claim, in which a lower end of each longitudinal face of the device (1) carries a fixing lug (14) which is inserted into a member of the printing machine for securing the device (1) to the printing machine. Assembly according to the preceding claim, in which the fixing lug (14) slides on a slide (15) provided with two grooves, two sliding means carried by the fixing lug (14) penetrating into a respective groove with locking in position sliding means by clamping. Method of feeding a printing machine by a device (1) for supporting rolls (2) of printable material according to any one of Claims 1 to 9 or for an assembly according to any one of Claims 10 to 12, which method comprises the following steps:

• loading of the device (1) by successive insertion of rollers (2) carried by respective first and second support elements (4, 5; 10, 10a, 5) by adjustment of each second support element (10, 10a, 5) to a length of the associated roller (2),
• blocking in the longitudinal position of each roller (2) after displacement and blocking of its associated second support element (10, 10a, 5),
• bringing the device (1) in front of a supply inlet of the printing machine,
• rotation of the first support elements (4, 5) and of the beam (8) so that a first roller (2) carried by the device (1) is arranged opposite the feed inlet of the machine printing and introduction by unwinding of an end of printable material from the first roll (2) into the printing machine,
• when the printable material is consumed on the first roller, rotation of the first support elements (4, 5) and of the beam (8) so that a second roller (2) carried by the device (1) is arranged opposite the feed inlet of the printing machine and introduction of one end of printable material from the second roller (2) into the printing machine,
• repeating the previous step for all the successive rollers (2) carried by the device (1) until the printable material carried by a last roller (2) present on the device (1) has run out,
• when the printable material of all the rolls (2) is exhausted, moving the device (1) away from the printing machine for its reloading of rolls (2) of printable material.

ABRIDGED DESCRIPTION
Support device for rolls of printable material with support elements adjustable in translation
The invention relates to a device (1) for supporting rolls (2) of printable material carried by first and second support elements (4, 5; 10, 10a, 5) spaced apart and each associated with a longitudinal end of the roll in carrying a cylindrical sleeve (5) penetrating the longitudinal end, the first support elements (4, 5) being in the form of a single disc (4) carrying the cylindrical sleeves (5) and driven in rotation. The second support elements (10, 10a, 5) are independent and are each in the form of an arm (10, 10a) comprising, at a free end, the associated cylindrical sleeve (5), each arm (10, 10a ) being sliding along a beam (8) parallel to the rollers (2) and comprising a removable locking means (6) in position of the arm (10, 10a) relative to the beam (8) driven in rotation by the manual means (7) or by motor means.
Figure 1
[Fig. 1]

[Fig. 2]