EP2655226B1 - Winder device for a reel of web material - Google Patents

Description

The present invention relates to a strip material reel dispenser for feeding, in particular a packaging unit, comprising a support structure and provided with means for receiving and maintaining in rotation at least one first reel in a first working position.

The present invention is in the field of web material reel devices.

The invention more particularly relates to a reel device of strip material.

It is known in the field of supplying strip material the use of a film reel machine for feeding a packaging machine, in particular a foodstuff machine, consisting of a reel of film which is rotated by traction to drive the film to the packaging machine.

In this type of machine the main problem lies in the replacement of the coil without interruption of production, which, on the one hand, seems very difficult to achieve with a simple machine or, on the other hand is possible through a complex and expensive machine found in the field of printing.

In addition, the use of such complex machines for the packaging of products would involve a significant cost because the packing plants include a large number of packaging lines and that, on the same packaging line, several types packing can be used.

In addition, the same product can be packaged in separate packages.

Indeed, the product in question is first conveyed to a first packaging station to be deposited in a tray resulting from a waffling operation of a first strip material of uniform appearance, not including specific marking. Then, the product in his tray is brought in front of a second packaging station at which the tray is closed by heat sealing with a second strip material, which, unlike the embossed material, carries a specific impression, such as a mark or a photo.

Depending on the destination of the product, for example depending on the distribution store, this second heat-sealed material is caused to change during production. This change is even more common in the field of food.

It's hard to imagine making complex reel machines. Similarly we can not imagine to stop production to change this film each time.

Finally, existing devices in the state of the art have a large footprint which is often problematic for the establishment of such devices along a packaging unit.

The closest state of the art is represented by the document DE 90 16 526 U1 .

It is within the framework of an inventive step that we thought to realize a simple, ergonomic and inexpensive machine allowing to carry out the operation of change of film without stopping the production. In addition, thanks to the device according to the invention, the abutment between two film reels is facilitated.

The object of the invention is to overcome the drawbacks of the state of the art by proposing a reeling device for reels of web material for feeding, in particular, a packaging unit located on the rear side with respect to said device. , the latter having a support structure, in the form of two consoles, and provided at least with means for receiving and maintaining in rotation at least a first coil in a first working position and means for receiving at least one second coil in a waiting position, said device further comprising abutting means constituted by a clamp comprising a first jaw and a second jaw, said jaws extending parallel to the unwinding axes of the coils and transversely to a band, the first jaw being located on the routing path of the belt towards a downstream machine and the second jaw being movable type and likely to occupy, by means of suitable drive means, a position applied to the first jaw and a waiting position in which the web of the second reel, located in the waiting position on the reel device, can be applied and maintained on this second jaw.

• au moins des moyens pour la réception et le maintien en rotation de la dite première bobine dans au moins une seconde position de travail ;
• des moyens pour translater ladite première bobine depuis ladite première position de travail dans ladite seconde position de travail ;
• des moyens d'évacuation de ladite première bobine depuis ladite seconde position de travail sur ladite structure support ;
• des moyens de transfert de la dite seconde bobine depuis ladite position d'attente dans ladite première position de travail,
• lesdits moyens de transfert consistent en des couloirs de guidage ménagés entre les consoles, chacun desdits couloirs de guidage étant prolongé par une portion horizontale, cette dernière permettant l'engagement d'un mandrin sur lequel est monté une bobine, ledit dispositif comportant encore des rampes de chargement articulées aptes à passer une position dépliée où lesdites rampes viennent s'effacer entre les consoles.

Said device also comprises:

• at least means for receiving and maintaining in rotation of said first coil in at least a second working position;
• means for translating said first coil from said first working position into said second working position;
• means for evacuating said first coil from said second working position on said support structure;
• transfer means of said second coil from said waiting position in said first working position,
• said transfer means consist of guide lanes formed between the brackets, each of said guide lanes being extended by a horizontal portion, the latter allowing the engagement of a mandrel on which is mounted a coil, said device further comprising ramps articulated loading adapted to pass an unfolded position where said ramps are erased between the consoles.

According to another characteristic of the invention, the reel device comprises guiding means for conveying the strip material towards the machine of use, characterized in that it comprises on the scrolling path the band for connecting the end of the strip from the first reel in said second working position at the beginning of the web of the second reel in said standby position or in said working position a connection table.

• la figure 1 est une représentation schématisée et en perspective du dispositif dévidoir selon l'invention ;
• la figure 2 est une représentation schématisée et en élévation du dispositif dévidoir tel que représenté dans la figure 1 dans le cadre d'une application à une machine d'emballage ;
• les figures 3 à 10 représentent, de manière schématisée, les étapes de changement d'une bobine de matériau en bande pour l'alimentation d'une machine d'emballage telle que représentée à titre d'exemple dans la figure 2.

Other characteristics and advantages of the invention will emerge from the following detailed description of non-limiting embodiments of the invention, with reference to the appended figures in which:

• the figure 1 is a schematic representation and in perspective of the reel device according to the invention;
• the figure 2 is a schematic and elevational representation of the reel device as shown in FIG. figure 1 as part of an application to a packaging machine;
• the Figures 3 to 10 schematically represent the steps of changing a reel of web material for feeding a packaging machine as shown by way of example in FIG. figure 2 .

As shown in the figures 1 and 2 The present invention relates to a reel device 1 of reels 2, 3 of web materials, of synthetic, cellulose or other type, capable of intervening in the feed of any processing unit, for example a packing unit. By way of example in the context of such an application, this strip material can be defined capable of undergoing an embossing operation for the definition of a container just as it can be in the form of a film, transparent or no, possibly carrying various impressions and may, for example, be applied by heat sealing on such containers formed by embossing a strip of suitable synthetic material.

In any event, the reel device 1 according to the invention comprises a support structure 4 provided with means 5A for receiving and maintaining in rotation at least one first reel 2 in a first working position 6A.

Substantially, this support structure 4 can be in the form of two consoles 7, 8 capable of keeping in rotation a mandrel 9 on which such a coil 2, 3 is mounted.

Such a support structure 4 may further integrate various return rollers 10, 11 to convey a strip of material 12 towards the unit at which it will be transformed. Such a unit may especially consist of a thermoformer.

In particular, this support structure 4 can still receive means for energizing the band, or even a system 13 to rocker or diabolo to constitute a buffer stock and ensure the absorption of variations in running speed of the band 12, 13 particularly useful system when the strip 12 is made to progress discontinuously.

So, for example with reference to the figure 2 , the system 13, here rocking, comprises at least one return roller 131, 132, 133, around or of which is wound partially the material strip 12, this or these return rollers 131, 132 133 being mounted at their ends in rotation, on two support arms 134. These support arms 134 are themselves pivotally mounted at one end 135 about an axis of rotation 136 transverse to said band 12.

In addition, this strip 12, while partially wrapping around the return roller or rollers 131, 132, 133, still partially and alternately wraps around other return rollers 137 and 138 mounted on the support structure 4. forming a plurality of band strands 12 constituting a buffer stock for compensating for variations in the running speed of the material web 12.

On the figure 2 , the axis of rotation 136 is mounted on the support structure 4 on the side of the packaging unit, the support arms 134 therefore being pivoted on the front part of the reel device 1. However, advantageously, it can be intended to reverse this tilting positioning of the system 13, in other words the axis of rotation 136 can be located on the front part of the reel device 1. Such an implantation avoids, during oscillations of the support arms 134, to strike an intervening operator in front of said reel device 1.

In a particularly advantageous manner, the system 13 with rocker or diabolo allows a management of the tape stock length and makes it possible to detect, by specific technical means, the exceeding of a limit stock which may result from an excess of time during sealing two strips of material. Thus, the processing unit of said band of material 12, located downstream of said system 13, can stop to allow the operator to finish the seal. This sealing step will be described below.

• au moins des moyens 5B pour la réception et le maintien en rotation de ladite première bobine 2 dans au moins une seconde position de travail 6B ;
• des moyens 5C pour la réception et le maintien d'au moins une seconde bobine 3 dans une position d'attente 6C ;
• des moyens 14 pour translater ladite première bobine 2 depuis ladite première position de travail 6A dans ladite seconde position de travail 6B ;
• des moyens d'évacuation 15 de ladite première bobine 2 depuis ladite seconde position de travail 6B sur ladite structure support 4 ;
• des moyens de transfert 16 de ladite seconde bobine 3 depuis ladite position d'attente 6C dans ladite première position 6A de travail.

As already indicated above, the reel device 1 according to the invention comprises, at its support structure 4, means 5A for receiving and maintaining in rotation at least a first reel 2 in a first working position 6A, knowing that to ensure a certain continuity of the supply of the machine downstream of strip materials, either at the end of unwinding of a coil 2, 3 for the replacement of another, or in case of replacement at the level of said belt material type machine ensuring its feeding, it is provided, according to the invention:

• at least means 5B for receiving and maintaining in rotation said first coil 2 in at least a second working position 6B;
• means 5C for receiving and maintaining at least one second coil 3 in a waiting position 6C;
• means 14 for translating said first coil 2 from said first working position 6A into said second working position 6B;
• means 15 for evacuating said first coil 2 from said second working position 6B on said support structure 4;
• transfer means 16 of said second coil 3 from said waiting position 6C in said first working position 6A.

Substantially, the means 5A, 5B, 5C for receiving and keeping in rotation a spool 2, 3, whether in the first working position 6A, the second working position 6B or in the waiting position 6C are constituted by support bearings at the brackets 7, 8, of the support structure 4. It will be described further in what consist, substantially, these bearings.

Advantageously, said first working position 6A, a coil 2, 3 on the support structure 4 is located at a level higher than the second working position 6B on the latter. In addition and advantageously, the waiting position 6C is located substantially at the same level as the first working position 6A but in a vertical plane offset from the side opposite to the strip material processing machine from said coils, so as to facilitate the transfer of the reel 2, 3 from the waiting position 6C to the first working position 6A.

Of course, this waiting position 6C could also be arranged above or in the same axis as the working position 6A

As for the means 14 for translating the first coil 2 from the first working position 6A into the said second working position 6B and at least the transfer means 16 of the second coil 3 from the waiting position 6C in the first position 6A, they consist, substantially, of guide passages 17, 18 formed at the brackets 7, 8 between said working positions 6A, 6B and the waiting position 6C, guideways 17, 18 in which the ends of the mandrels 9 on which the first coil 2 and the second coil 3 are mounted can be held.

Note that such guideways 17, 18 may be defined by adapted slides or even cutouts in the brackets 7, 8.

In addition, since the second working position 6B is at a lower level than the first working position 6A, the translation means 14 are further supplemented by means for retaining and driving the ends of the mandrel 19. 9 along the guide passages 17, 18 between this first working position 6A and the second working position 6B.

As illustrated in the figures 1 and 2 these are located in the same vertical plane, one above the other. The retaining and driving means 19 are then constituted, advantageously, in elevator devices for retaining and guiding the ends of the mandrel 9 from said first working position 6A, in said second working position 6B.

In contrast, since the waiting position 6C is substantially at the same level as the first working position 6A, the transfer means 16 may be present along the guide passages 17, 18 in a single stop. adapted to transiently retain a second coil 3 in said standby position 6C before allowing it, by erasure, to gain said first working position 6A.

As for the evacuation means 15, they consist essentially of guide passages 17, 18 opening on one side 21 or the other 22 of the brackets 7, 8 of the support structure 4.

Preferably, between the second working position 6B and the open end 23 of these guide passages 17, 18, they are substantially horizontal, or even have a slight downward slope facilitating, precisely, the extraction of the coil. It should be noted that these evacuation means 15 can be further completed, again, by a stop 24 along the guide passages 17, 18 able to maintain, before evacuation, by acting on the ends of the mandrel 9, a spool 2, 3 in its second working position 6B.

In the same way, upstream of the waiting position 6C, the guide passages 17, 18 may be extended by a horizontal portion 25 opening on one of the sides 21, 22 of the brackets 7, 8 of the support structure 4 allowing the engagement of a mandrel 9 on which is mounted a new coil to be brought into said standby position 6C mounted on the reel device 1 by engagement in these ends opening guideways 17, 18.

According to a preferred embodiment the horizontal portion 25 of each of the guide passages 17, 18, allowing the engagement of a mandrel 9 on which is mounted a coil 2 or 3 is extended by an articulated loading ramp 39, this ramp of loading 39 is able to pass of an unfolded position, in which it extends said horizontal portion 25 being projecting in the front part of the reel device 1, in a folded position where this ramp 39 is faded between the two consoles 7,8, as visible on the figure 2 .

Thus, the operator unfolds said ramps 39 when the mandrel 9 comprising the coil 2, 3 must be engaged in the horizontal portion 25. On the contrary after loading, the operator folds these ramps 39 to allow a minimum space around said device 1 .

Such a configuration advantageously allows, in the case where the operator has set up a coil by mistake on the loading ramps 39, and before sealing the coil to that which is being unwound, an easy withdrawal of said coil.

Preferably, the horizontal portions 25 of the guide passages 17, 18 and, incidentally, their extension, the articulated loading ramps 39 comprise, on at least a part of their length, racks intended to cooperate with toothed wheels located at the ends of the mandrel. 9. This cooperation between racks and toothed wheels makes it possible to ensure the perpendicularity of the axis of said mandrel 9, on which the coil 2 or 3 is mounted, with respect to the guide passages 17, 18.

In addition, the cooperation between the racks and the gear wheels allows a reduction of movement which prevents the coil 2, 3 is pushed back at high speed in the reel device 1. Indeed, a film-loaded reel can weigh up to at a hundred kilograms and engaged at high speed without being braked, it would be likely to cause a degradation of the entire device 1. It is therefore advantageously avoided that the coils 2, 3 do not engage across at the level of loading ramps 39.

However, to allow free rotation of the coil 2 or 3 and its mandrel 9, first in its position waiting 6C and then in its working position 6A, it is essential that in these different positions, the rack-toothed-gear cooperation is interrupted. Also, according to the invention, at least immediately preceding this waiting position 6C, the racks are interrupted along the horizontal portion 25 of the guide passages 17, 18, allowing precisely this free rotation of the ends of the mandrel in said corridors 17 , 18.

According to a preferred embodiment, said ends of the mandrel 9 are provided with rolling means, preferably in the form of rollers, on the one hand allowing the mandrel 9 and thus on the spool to reach said waiting position 6C and other by, the rotation of the mandrel 9 about its axis.

According to yet another feature of the present invention, at least one of the guide passages 17, 18 is provided, substantially upstream of said standby position 6C, with a retractable abutment adapted to retain the corresponding end of the mandrel 9 of the coil in this waiting position 6C. Advantageously, this stop is designed capable of being retracted, preferably against the action of elastic return means under the impulse of the end of the mandrel 9 in the direction of movement of the latter, in order to load the coil . On the contrary, this stop opposes a reverse displacement of unloading.

However, to enable unloading, for example in the event of a loaded coil error, said stop is made integral with auxiliary retraction means, preferably in the form of a lever, pivotally mounted on the support structure 4, and which, by manual or motorized bearing, makes it possible to render inactive said stop allowing precisely the withdrawal of the coil.

The following description relates to the method of setting up and replacing a coil on the reel device 1 according to the invention.

So, referring to the figure 3 , it is illustrated the placing a first spool 2 on this reel device 1. More particularly, the ends of the mandrel 9 on which is mounted a first spool 2 are engaged, through the portions 25 in the guide passages 17, 18 to bringing said coil 2 into its first working position 6A. Very exactly in this first working position 6A, these ends of the mandrel 9 rest on the retaining and driving means 19 that each guide channel 17, 18 comprises.

As illustrated in figure 4 , the strip material of this coil 2 is then fed through the device to feed the machine downstream.

When this coil 2 reaches the end of unwinding, more exactly when its section 26 reaches a threshold diameter identified by means of detection 27 adapted, mechanical, optical or other type, the translation means 14, in this case the means retaining and driving 19 lower said coil 2 in its second working position 6B. This consists in moving said holding and driving means 19 along the guide passages 17, 18 driving the ends of the mandrel 9 on which said spool 2 is mounted. In this second working position 6B, the abutment 24 completing the means receiving and holding 5B maintain the ends of the mandrel 9 in this second working position 6B and prevent the mandrel 9 from reaching the open ends 23 of the guide passages 17, 18. As it is visible on the figure 5 during this descent of the reel 2 from the first working position 6A, in the second working position 6B, the web 12 continues its course by feeding the machine downstream.

At the same time, the receiving and holding means 5C constituted substantially by the abutments 20 in the guide passages 17, 18 are made active so as to retain a second reel 3 in a waiting position 6C.

This second reel 3 placed by engagement of the end of the mandrel 9 on which it is mounted in the horizontal portions 25 guide passages 17, 18, end otherwise provided in cooperation with the stops 20, the first coil 2 continues to unwind until the end of the band. The Figures 7, 8 and 9 illustrate the abutting of the end of the web 28 of the first reel 2 with the beginning of the web 29 of the second reel 3 by means of abutment 30 which will be described in more detail in the description below.

As illustrated by figure 10 once this abutment has been performed, the second reel begins to unwind while the evacuation of the first reel passes through the ends 23 of the guide lanes 17, 18, after erasing the stop 24 of the receiving means and maintaining 5B. Evidently, this first reel evacuated, the retaining and driving means 19 in the guide lanes 17, 18 are raised so as to receive the ends of the mandrel 9 of the second spool 3 and maintain it in the first position 6A working after erasing the stops 20 corresponding to the receiving means and 5C holding.

It should be observed that rather than waiting for the total unwinding of a first spool 2 mounted on the reel device 1, the strip of this first spool 2 can be cut allowing the evacuation of said spool and its replacement by a new spool. therefore, a new band which may be of a different material or appearance than the first band corresponding to the previous coil.

To return to the abutment means 30, these are substantially constituted by a clamp 31 comprising a first jaw 32 and a second jaw 33.

Advantageously, these jaws 32, 33 extending parallel to the unwinding axes of the coils 2, 3 and therefore transversely to a strip 12, are at a vacuum which makes it possible to maintain a strip by suction.

Preferably, the first jaw 32 is located on the routing path of the strip 12 towards the downstream machine while the second jaw 33 is mobile type and likely to occupy, by means of 34, a position applied to the first jaw 32 and a standby position 35 in which the strip 12A of the second coil 3 located in the standby position 6C on the reel device 1, can be brought into position. applies on this second jaw 33 to be held and sucked by the latter and finally be folded applies to the first jaw 32 above which passes the band 12 of the first coil 2.

Preferably, the reeling device 1 according to the invention is equipped with a safety device intended to prevent the mobility of the jaw 33, for example when the packaging unit, such as the thermoforming machine, is in operation. Such a safety device may in particular consist of a stop holding the jaw 33 when the thermoformer operates, said stop being retractable to allow its removal when the operator wishes to apply said jaw 33 to the first jaw 32.

Advantageously, these abutment means 30 may also be associated with cutting means 36 of the strip or strips 12, 12A. Such cutting means 36 may be associated with the fixed jaw 32 of the clamp 31 as with each of the jaws 32, 33.

Advantageously, again, at this or these jaws 32, 33, the clamp 31 corresponding to the abutment means 30, are associated heating means for an abutment by heat sealing strips 12, 12A of synthetic material.

One can still imagine rather than a heat seal a tape bonding solution. In this case, the abutment means 30 may be equipped with such bonding means.

According to yet another particularity of the present invention, the reel device 1 comprises braking means 37A, 37B, 37C associated at least with the first working position 6A, and with the second working position 6B on the support structure 4, even preferably also at the standby position 6C.

Such braking means 37A, 37B, 37C are designed capable to cooperate with complementary braking means 38 that comprises the mandrel 9 on which is mounted a coil 2, 3. Thus, through such braking means 37A, 37B, 37C, one is able to control the progress of a coil 2, 3, whatever the position occupied by such a coil on the reel device 1.

According to an advantageous embodiment, the braking means 37A, in the first working position 6A and the braking means 37B in the second working position 6B are the same and embarked on the retaining and driving means 19 corresponding to the translation means 14. In sum, only the braking means 37C in the waiting position are distinct from those acting on a coil when it is in its working position 6A and 6B.

A coil can be loaded only when the braking means 37A, 37B, 37C are open to avoid to avoid hitting said braking means.

Thus, the present device may for example comprise coil load detecting means, in particular being able to be associated with the loading ramp 39, thus detecting when said ramp 39 is in an unfolded position.

These detection means can also be associated with the retractable stop, the control retraction of the stop by the mandrel 9 generating the opening of the brake with a suitable sensor.

The advantages that flow from the present invention are that, on the one hand, the coils can be brought and removed from the reel device 1 from the same side 21 of the consoles 7, 8 to assume that on this side 21 open the corridors of guidance 17, 18 whether to access the standby position 6C or to ensure the evacuation starting from the second working position 6B.

The transfer of a reel from its first working position 6A into its second working position 6B can be ensured in an automated manner through a detection of the section of the coil by means 27 adapted. Moreover, such a transfer can be signaled by means of visual and / or sound signaling means adequate so that the operator is quick to mount on the reel device 1 a second reel and bring it into the position of waiting 6C.

Similarly, visual and / or audible signaling means may be provided to signal to an operator the end of unwinding of a strip from a reel in its second working position 6B to ensure the abutment of a new strip starting from a new coil.

As is apparent from the foregoing description, the reel device discloses that making it very easy to replace a strip or change a reel, remains a very simple design and, therefore, a reduced cost . In addition, said device is particularly ergonomic and can, therefore, be easily arranged without requiring too much space.

The present invention therefore makes it possible to respond effectively to the problem posed.

Claims (12)

1. Dispenser device (1) for coils (2, 3) of sheet material namely for supplying a packaging unit located on the rear side with respect to said device (1), the latter including a supporting structure (4) in the form of two brackets (7, 8) and provided with at least means (5A) for receiving and maintaining in rotation at least a first coil (2) in a first working position (6A) and means (5C) for receiving at least a second coil in a standby position (6C), said device (1) also including butt-jointing means (30) formed of a clamp (31) comprising a first jaw (32) and a second jaw (33), said jaws (32, 33) extending parallel to the coil unwinding axes (2, 3) and transversely to a sheet (12) of the first coil (2), the first jaw (32) being located on the sheet-conveying path (12) towards a machine located downstream and the second jaw (33) being movable and capable of occupying, thanks to adapted driving means (34), a position applied against the first jaw (32) and a standby position (35), in which the sheet (12A) of the second coil (3) located in the standby position (6C) on the dispenser device (1) can be brought against and maintained on the second jaw (33),
   wherein said dispenser device also includes:

   - at least means (5B) for receiving and maintaining in rotation said first coil (2) in at least a second working position (6B);

   - means (14) for translating said first coil (2) from said first working position (6A) into said second working position (6B);

   - means for evacuating (15) said first coil (2) from said second working position (6B) onto said supporting structure (4);

   - means for transferring (16) said second coil (3) from said standby position (6C) into said first working position (6A), said transfer means (16) being formed of guiding lanes (17, 18) provided for between the brackets (7, 8), each one of said guiding lanes (17, 18) being extended by a horizontal portion (25), the latter permitting the insertion of a mandrel (9) on which a coil (2, 3) is mounted, said device (1) also including articulated loading ramps (39) capable of passing from an unfolded position, in which it extends the horizontal portions (25), to a folded position, in which said ramps (39) withdraw between the brackets (7, 8).
2. Dispenser device (1) according to claim 1, wherein at least part of the horizontal portions (25) of the guiding lanes (17, 18) and at least part of the loading ramps (39) extending said horizontal portions (25) are provided with toothed racks aimed at cooperating with toothed wheels located at each of the two ends of the mandrel (9), this cooperation ensuring the perpendicularity of the axis of the mandrel (9) with respect to the guiding lanes (17, 18).
3. Dispenser device (1) according to any one of claims 1 or 2, wherein the movable jaw (33) is provided with a stop retaining said movable jaw (33) when the packaging unit is operating.
4. Dispenser device (1) according to one of claims 1 to 3, including guiding means for conveying the sheet material towards the machine being used, wherein it includes, on the sheet-conveying path a jointing table for jointing the end of the sheet (28) coming from the first coil (2) in said second working position (6B) to the sheet start (29) of the second coil (3) in said standby position (5C) or in said working position (6A).
5. Dispenser device (1) according to one of claims 1 to 4, wherein said first working position (6A) of a coil (2, 3) on the supporting structure (4) is located at a higher level than the second working position (6B) on the latter.
6. Dispenser device (1) according to any one of claims 1 to 4, wherein said standby position (6C) is located substantially at the same level as the first working position (6A), but in a vertical plane offset to the side opposite the machine for processing the sheet material coming from said coils, so as to facilitate the transfer of the coil (2, 3) from the standby position (6C) into the first working position (6A).
7. Dispenser device (1) according to any one of claims 1 to 6, wherein it includes retaining and driving means (19) formed as elevator devices permitting to retain and guide the ends of the mandrel (9) from said first working position (6A) into said second working position (6B).
8. Dispenser device (1) according to any one of claims 1 to 7, wherein said jaws (32, 33) are recessed in order to permit to ensure the holding of a sheet (12) by suction.
9. Dispenser device (1) according to any one of claims 1 to 8, wherein it includes braking means (37A 37B and 37C) associated with at least the first working position (6A) and with the second working position (6B) on the supporting structure (4), even preferably also with the standby position (6C).
10. Dispenser device (1) according to any one of claims 1 to 9, wherein it includes a tilting system (13) forming a buffer stock for the sheet material (12), said system (13) including at least one deflection roller (131, 132, 133) around which said sheet (12) winds up, said rollers (131, 132, 133) being mounted at their ends in rotation on two supporting arms (134), said arms (134) being pivotally mounted at one end (135) about an axis of rotation (136) transverse to said sheet (12), said system (13) also including at least one deflection roller (137, 138) mounted on the supporting structure (4).
11. Dispenser device (1) according to claim 10, wherein the axis of rotation (136) of the tilting system (13) is mounted on the front portion of the dispenser device (1), opposite the rear side at the level of which is located the packaging unit.
12. Dispenser device (1) according to claim 10, wherein the tilting system (13) is associated with means for detecting a limit stock of the sheet material (12) permitting to stop of the packaging unit in case of detecting that a limit stock is exceeded.

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