EP2964435A1

EP2964435A1 - Method for adjusting the radial gap between two tools, arrangement for transforming a support, cassette, unit and machine equipped with same

Info

Publication number: EP2964435A1
Application number: EP14708199.6A
Authority: EP
Inventors: Sylvain Bapst; Guillaume DÉNISSE
Original assignee: Bobst Mex SA
Current assignee: Bobst Mex SA
Priority date: 2013-03-07
Filing date: 2014-03-04
Publication date: 2016-01-13
Anticipated expiration: 2034-03-04
Also published as: TWI538794B; WO2014135266A1; EP2964435B1; JP6137651B2; CN105189060B; JP2016515051A; CN105189060A; TW201446447A; KR101809807B1; KR20150128847A; US20160016324A1

Abstract

In a method for adjusting a radial gap (20) between two tools (16, 17) for transforming a planar support (2), an arrangement (18) for transforming the support (2) comprises: - first and second rotating cylindrical transformation tools (16, 17), each provided with two tapered side bearing rings (21, 22, 23, 24), and arranged and cooperating together to transform the support (2), - first and second side bearings (26, 27), holding the first tool (16) for rotation (Rs), - third and fourth side bearings (29, 31), holding the second tool (17) for rotation (Ri), - clamping elements (34, 37) for clamping together the first and third bearings (26, 29), and the second and fourth bearings (27, 31). The method comprises the steps consisting of: - loosening the clamping elements (34, 37), - pushing (U) the first bearing (26) away from the third bearing (29), and the second bearing (27) away from the fourth bearing (31), according to a predetermined distance (e), - modifying (L) a lateral position of at least one of the rings (21, 22), - bringing (D) the first bearing (26) towards the third bearing (29), and the second bearing (27) towards the fourth bearing (31), and - retightening the clamping elements (34, 37).

Description

METHOD FOR ADJUSTING THE RADIAL INTERVAL BETWEEN TWO TOOLS. ARRANGEMENT FOR TRANSFORMING A SUPPORT. CASSETTE. UNIT. AND

MACHINE THUS EQUIPPED

The present invention relates to a method for adjusting the radial gap existing between two tools for transforming a plane support. The invention relates to a transformation arrangement for a flat support, provided with two cylindrical processing tools, in a packaging production machine. The invention also relates to a conversion cassette for a plane support, comprising a transformation arrangement for the plane support. The invention relates to a processing unit for a flat support, equipped with a conversion cassette for the plane support. The invention relates to a transformation unit for a plane support, comprising at least one transformation arrangement for the plane support. The invention also relates to a packaging production machine from a flat support, comprising at least one processing unit for the plane support.

A packaging production machine is intended for the manufacture of boxes, which form packaging, after folding and gluing. In this machine, an initial planar support, such as a continuous strip of cardboard, is unwound and is printed by a printing unit, consisting of printing units. The strip is then transferred to a processing unit to make plate elements, in this case boxes.

The processing unit comprises at least one transformation arrangement provided with two rotary cylindrical tools, positioned parallel to each other, so as to cooperate with each other. The band moves between the two tools, to be transformed. Both tools rotate in opposite directions. The first tool is rotatably mounted in a first and a second bearing. And the second tool is rotatably mounted in a third and a fourth bearing. Clamps are provided to hold firmly together and prestress the first with the third bearing, and the second with the fourth bearing. The transformation arrangement is most often provided to form a cassette. The cassette is slidably inserted into each of the side frames of the unit.

The cassette allows quick change of tools, depending on transformations of the support to be realized. The packaging manufacturer has at least two cassettes. A first cassette is in the machine being produced and is adapted according to the transformation work in progress. Meanwhile, a second cassette is being edited and adjusted to suit the next transformation job. When changing the job, the operator takes out the old cassette and inserts the new cassette, minimizing machine downtime.

By way of example, one of the arrangements or one of the cassettes is respectively a rotary cutting arrangement or a rotating cutting cassette. A first cylindrical cutting tool is provided with knives, and a second cylindrical tool is smooth, and is called anvil. A radial gap between the first cylindrical cutting tool and the second cylindrical tool must be very precisely adjusted.

At the time of cutting, the edges of the cutting tool's knives must pass as close as possible to the anvil roll, in order to make a clean cut. The edges of these knives should not, however, touch the anvil cylinder, because they would be irretrievably destroyed during rotation. The material constituting the support, i.e. the fibers in the case of the carton, must not appear at the cut. It is also not desirable to have dust from the cutting of the material constituting the support. The advantage of adjusting the radial gap is also to compensate for the progressive wear of the cutting tool blades. Therefore, the optimal radial gap between the two rotating cylindrical tools is set in the micron. State of the art

EP-0764'505 discloses a cutting station, each end of the two rotary cylindrical tools comprises a conical side crown. The two crowns of the first tool roll respectively on the two crowns, associated and diametrically opposed, of the second tool. Each of the rings has a frustoconical shape, with an inclined surface coming into contact with the inclined surface of the crown which is directly associated with it. The position of the crowns of the first tool can be modified laterally. The lateral displacement of a crown relative to its associated crown causes a variation of the total thickness of these two crowns against each other. This has the effect of varying the difference between the first and the second tool, the radial gap is thus obtained accurately. To do this, the operator first loosens the clamping elements of the bearings. Then it moves the assembly formed by the first bearing, the second bearing and the first tool, so as to separate it from the assembly formed respectively by the third bearing, the fourth bearing and the second tool. This movement is ensured by means of pivoting adjustment wedges mounted on micrometric screws.

However, this solution is long. Each of the holds must be turned manually and sequentially, which takes time. Another disadvantage is that it is difficult to move the first and second bearings simultaneously and at the same distance. It often happens that the lifting of the first landing is done at an angle to the second landing.

Presentation of the invention

A main object of the present invention is to implement a setting method for an arrangement for transforming a planar support. A second objective is to provide a method for facilitating an adjustment of the radial gap between two transformation tools for a plane support. A third objective is to develop a transformation arrangement for a planar support, intended for a processing unit in a packaging production machine. A fourth objective is to provide a rotating tool transformation arrangement to achieve a simplified adjustment and to reduce the adjustment time of the radial gap between the two tools. A fifth objective is to solve the technical problems mentioned for the arrangements of the state of the art. A sixth objective is to provide a cassette comprising a transformation arrangement for the processing unit. Another objective is to succeed in inserting a processing unit in a packaging production machine.

A method is used to adjust an existing radial gap between two planar media transformers in a transformation arrangement for the planar support. The transformation arrangement for the planar support comprises a first rotary cylindrical tool for transformation and a second rotary cylindrical tool for transformation. The first rotary cylindrical tool for transformation and the second rotary cylindrical tool for conversion are each equipped with two conical side bearing rings. The first rotary cylindrical tool of transformation and the second rotary cylindrical tool of transformation are arranged between them and cooperate with each other to transform the support. The transformation layout for the plane support comprises a first lateral bearing and a second lateral bearing. The first and second lateral bearings maintain the first rotating cylindrical tool for rotation. The transformation arrangement for the planar support comprises a third lateral bearing and a fourth lateral bearing. The third lateral bearing and the fourth lateral bearing maintain the second rotating cylindrical tool for rotation. The transformation arrangement for the plane support comprises clamping elements of the first lateral bearing with the third lateral bearing, and clamping elements of the second lateral bearing with the fourth lateral bearing.

In accordance with one aspect of the present invention, the method comprises the steps of:

- to loosen the clamping elements of the first lateral bearing with the third lateral bearing,

- to loosen the clamping elements of the second lateral bearing with the fourth lateral bearing,

- pushing the first lateral bearing of the third lateral bearing, according to a predetermined distance, and relying on this same third lateral bearing,

- to push the second lateral bearing of the fourth lateral bearing, according to a predetermined distance, and relying on this same fourth lateral bearing,

modifying a lateral position of at least one of the conical lateral rolling crowns on at least one of the rotary cylindrical transformation tools,

- to bring the first lateral bearing of the third lateral bearing,

- to bring the second lateral bearing of the fourth lateral bearing,

- to tighten the clamping elements of the first lateral bearing with the third lateral bearing, and

- to tighten the clamping elements of the second lateral bearing with the fourth lateral bearing. In other words, a step is implemented to push on the first bearing, to separate it from the third bearing, and to push on the second bearing, to separate it from the fourth bearing. The steps of repelling and bringing the corresponding bearings are simultaneously and in one go. With such steps of repoussage in one and the same phase, the adjustment proves simpler, which thus makes it possible to avoid the errors of the operator. The setting time is reduced accordingly. The flat support is defined, by way of non-exhaustive example, as being made of a continuous web material, such as paper, flat cardboard, corrugated cardboard, laminated corrugated cardboard, flexible plastic, for example polyethylene ( PE), polyethylene terephthalate (PET), bioriented polypropylene (BOPP), or other materials.

A transformation arrangement for a planar support comprises a first rotary cylindrical tool for transformation and a second rotary cylindrical tool for transformation. The first rotary cylindrical tool of transformation and the second rotary cylindrical tool of transformation are arranged between them and cooperate with each other to ensure a transformation of the plane support. The transformation arrangement for the plane support comprises a first lateral bearing and a second lateral bearing. The first and second lateral bearings maintain the first rotating cylindrical tool for rotation. The transformation arrangement for the planar support comprises a third lateral bearing and a fourth lateral bearing. The third lateral bearing and the fourth lateral bearing maintain the second rotating cylindrical tool for rotation.

In another aspect of the invention, the transformation arrangement for the plane support is characterized in that it comprises translation means for spacing a predetermined distance, and reciprocally to bring the first lateral bearing of the third lateral bearing closer together. , and the second lateral bearing of the fourth lateral bearing, in two positions, a first close position, in which the two rotary rotary machining tools cooperate with each other, and a second spaced apart position, in which the two rotary cylindrical transformation tools are suitable to be modified, so as to adjust a radial gap between the first rotary cylindrical tool of transformation and the second rotary cylindrical tool of transformation.

In other words, the translation means are of the on-off type. An operator moves the translation means from the off position to the on position, and vice versa from the on position to the off position. With the translation means in the on position, the first bearing and the third lateral bearing are respectively spaced apart from the second bearing and the fourth lateral bearing. The two tools are separated from each other, which allows the operator to intervene to easily modify the tools and adjust them accordingly. When the translation means are in the off position, the tools are found again in working condition. In another aspect of the invention, a conversion cassette for a planar support is characterized in that it comprises a processing arrangement for the plane support having one or more of the technical features described below and claimed. With the conversion cassette, access, assembly and disassembly of the tools are facilitated for the operator ensuring the adjustments and the maintenance of the unit and the machine.

According to another aspect of the invention, a processing unit for a flat support is characterized in that it is equipped with at least one transformation cassette for the plane support, this cassette being provided with a transformation arrangement for the support. plan, having one or more of the technical characteristics described below and claimed.

According to another aspect of the invention, a processing unit for a planar support is characterized in that it comprises at least one processing arrangement for the planar support, having one or more of the technical features described below and claimed.

According to yet another aspect of the invention, a packaging production machine from a flat support is characterized in that it comprises at least one processing unit for the flat support, having one or more of the technical characteristics. described below and claimed.

Brief description of the drawings

The invention will be better understood and its various advantages and different characteristics will become more apparent in the following description, of the nonlimiting exemplary embodiment, with reference to the appended diagrammatic drawings, in which:

FIG. 1 represents a synoptic side view of a transformation unit;

FIG. 2 represents an isometric view of a cassette equipped with a transformation arrangement according to the invention;

- Figure 3 shows a partial longitudinal sectional view of two front bearings of the cassette of Figure 2;

- Figures 4 and 5 show an enlarged longitudinal sectional view of the translation means respectively with a first close position and a second spaced apart position;

- Figure 6 shows a partial isometric view of the actuating means for the translation means. Detailed description of preferred embodiments

A packaging production machine (not shown) processes a material or planar support, which in this case is a continuous web support, for example a flat board web. As illustrated in FIG. 1, the machine comprises a processing unit for a support 1 for transforming the strip 2. The direction of advance or scrolling (arrow F in FIG. 1) of the strip 2 and the following transformed strip the longitudinal direction indicates the upstream direction and the downstream direction in the unit 1. The front and rear positions are defined relative to the transverse direction, as respectively being the driver or operator side and the opposite driver or operator side.

The machine may have a tape drive, units such as printer units, print quality and printing control means, web guiding, and the like, which are positioned upstream of the printer. unit 1.

The processing unit 1 is an embossing, pressing and cutting unit. The band 2 arrives in the unit 1 by its transverse side upstream, with a constant speed. An introductory group comprising drive rollers and return rollers for the web 2 is provided at the input of the unit 1. The unit 1 transforms the web 2, successively by embossing it, pushing it back, and cutting it out.

The unit 1 delivers poses or transformed boxes 3, being therefore in cardboard embossed, repressed, and cut. The boxes 3 leave the unit 1 by its transverse side downstream, with the same constant speed. The boxes 3 made in the unit 1 are then separated laterally and longitudinally from one another in a separation station and then received in a receiving station (not shown).

The unit 1 firstly comprises a first embossing arrangement 4, arranged upstream, ie at the input of this unit 1. The embossing arrangement 4 is equipped with an upper rotary embossing tool 6, positioned parallel to a lower rotary embossing tool 7. In the exemplary embodiment, an embossing cassette 8 comprises the embossing arrangement 4.

The unit 1 comprises a second arrangement providing the upsetting 9, arranged downstream of the embossing arrangement 4. The upsetting arrangement 9 is equipped with a top rotary tool 11, positioned parallel to a lower rotary tool of In the exemplary embodiment, an upsetting cassette 13 comprises the upset arrangement 9.

The unit 1 comprises a third arrangement providing the cutout 14, arranged downstream of the upsetting arrangement 9, ie at the output of this unit 1. The cutting arrangement 14 is equipped with a first upper rotary cutting tool 16, positioned parallel to a second lower rotary cutting tool 17. the exemplary embodiment, a cutting cassette 18 comprises the cutting arrangement 14.

The arrangements 4, 9 and 14, and thus the cassettes 8, 13 and 18, are placed one after the other so that each carries out its respective transformation by embossing, extruding, and cutting the strip 2. A tool d waste ejection in the form of a cylinder provided with ejection needles may also be provided in place of the lower rotary tool cutting tool 17. Other combinations are possible, such as an upper cylinder forming both a cutting tool and a creasing tool.

The axis of rotation of each of the embossing tools 6 and 7, upset 1 and 12, and cutting 16 and 17 is oriented transversely to the running direction F of the strip 2. The direction of rotation (Rs arrow in 2), the upper embossing tools 6, the upsetting tool 11 and the cutting tool 16 are inverted with respect to the direction of rotation (arrow Ri in FIG. 2) of the lower embossing tools 7, the upsetting tool 12, and the cutting tool 17.

The embossing cassettes 8, upsetting 13 and cutting 18 are adapted to be introduced into a frame 19 of the unit 1, to be fixed to the frame 19, put into production, then conversely, able to be separated from the 19, and to be extracted from the frame 9. The unit 1 thus comprises three transverse housings provided in the frame 19 for each of the three cassettes 8, 13 and 18. The cassettes 8, 13 and 18 are introduced vertically, by the high relative to the frame 19 in the transverse housing. Conversely, the cassettes 8, 13 and 18 can be extracted vertically relative to the frame 19, out of their respective transverse housing.

The cutting arrangement 14, and thereby the cutting cassette 18, comprises (see FIG. 2) the first rotary cylindrical upper tool 16, which is provided with cutting threads (not shown) machined or reported on its circumference as a function of the configuration of the boxes to be made. The second cylindrical lower rotary tool or anvil 17 has a smooth circumference. The band 2 passes through the radial gap 20 between the upper tool 16 and the anvil 17. The upper tool 16 is arranged to cooperate with the anvil 17 to transform, i.e. to cut the band 2.

The upper tool 16 is provided at its front end with a first upper crown before the bearing 21. The upper tool 16 is provided at its rear end with a second upper rear running ring 22. The anvil 17 is provided with at its front end of a third lower crown before rolling 23. The anvil 17 is provided at its rear end with a fourth lower rear rolling crown 24.

All the rings 21, 22, 23 and 24 have a frustoconical shape. The upper crowns 21 and 22 thus have an inner curved surface pressed against the curved surface of the upper tool 16. The lower rings 23 and 24 have an inner curved surface pressed against the curved surface of the anvil 17. The upper crowns 21 and 22 of the upper tool 16 come into contact, bear against, and roll on the opposite lower rolling rings 23 and 24 of the anvil 17. As a result, the upper front ring 21 has an outer conical surface in abutment against an outer conical surface of the lower front crown 23. And the upper rear crown 22 has an outer conical surface abutting against an outer tapered surface of the rear lower crown 24.

In the exemplary embodiment, the two upper rings 21 and 22 of the upper tool 16 are laterally displaceable (arrow L in FIG. 2). When the operator laterally moves L a ring 21 and 22 relative to its opposite ring 23 and 24, for example a few tenth of a millimeter, their respective conical surface does not position at the same place. The cumulative total thickness of the front ring 21 of the upper tool 16 and the front ring 23 of the anvil 17, or the rear ring 22 of the upper tool 16 and the rear ring 24 of the anvil 17, against each other, varies. This results in a variation of the difference, i.e., in the radial gap 20 between the upper tool 16 and the anvil 17.

The cutting arrangement 14, and thereby the cutting cassette 18, comprises a first upper front bearing 26 and a second upper rear bearing 27, which hold for rotation the first tool, ie the upper tool 16 by its axis of rotation. 28. The cutting arrangement 14, and thereby the cutting cassette 18, comprises a lower third lower bearing 29 and a lower lower fourth bearing 31, which keep the second tool, ie the anvil 17, rotated by its axis of rotation 32. The base of the two lower bearings 29 and 31 rests on the frame 19 when the cutting cassette 18 is inserted in the unit 1.

The cutting arrangement 14, and thus the cutting cassette 18, comprises drive means, in the form of a gear (not visible in the Figures), for driving in rotation the two tools 16 and 17. When the cassette 18 is inserted into the frame 19, the pinion engages with the teeth of a conjugated pinion of a rotating electric motor. The first upper front bearing 26 of the upper tool 16 is attached to the lower third lower bearing 29 of the anvil 17, and the second upper rear bearing 27 of the upper tool 16 is attached to the lower fourth lower bearing 31 of the anvil 17, so as to constitute the cutting cassette 18. To hold the cassette 18 in one piece, clamping elements, in the form of four tie rods, upstream front and downstream before 33, and rear upstream and downstream rear 36, traverse vertically the upper front bearing 26 and the upper rear bearing 27, on either side of the axis of rotation 28 of the upper tool 16. The lower end of each of the four tie rods, front 33 and rear 36, is threaded and is screwed into a thread respectively of the lower front bearing 29 and the lower rear bearing 31. Four nuts, front upstream and downstream front 34, and rear upstream and downstream rear 37, are respectively screwed on the extr The nuts 34 and 37 block the tie rods 33 and 36 by pressing on an upper face respectively of the upper front bearing 26 and the upper rear bearing 27 and allow the bearings to be preloaded two by two. .

The cutting cassette 8, as well as the embossing cassette 8 and upset 13, comprise two gripping tabs 38 each provided at the upper face of the upper front bearing 26 and the upper rear bearing 27. The two tabs 38 are intended to cooperate with lifting means for vertically lifting and transporting the cassette 18, 8 and 13 outside the frame 19.

In order to be able to adjust the radial gap 20 between the upper tool 16 and the anvil 17, one or more often the two upper crowns 21 and 22 must be moved. To do this, the upper tool 16 is spaced vertically from the anvil 17, and the rings 21, 22, 23 and 24 are thus released from any bearing stress.

According to the invention, the cutting arrangement 14, and thus the cutting cassette 18, comprises first translation means 39 to move vertically (Arrow U in FIGS. 3 and 4), and vice versa to move vertically (arrow D). 3 and 5), the first bearing 26 of the third bearing 29. The cutting arrangement 14, and thus the cutting cassette 18, comprises second translation means for spreading vertically, and reciprocally to bring the second vertical vertically bearing 27 of the fourth bearing 31. The first and second translation means 39 move the first bearing 26 and the second bearing 27 respectively by a predetermined distance.

The translation means 39 have two positions (Figures 4 and 5). As a result, the first and second bearings 26 and 27 have the same two positions. And as a result, the upper tool 16 and the anvil 17 have the same two positions. In a first close position, the two tools 16 and 17 are arranged with each other with an optimal radial gap 20, and cooperate with each other to perform the cutting function. In a second position apart, the two tools 16 and 17 are found with a space between them and are adapted to be modified by displacement of their respective crowns 21 and 22.

The translation means 39 are advantageously arranged between the first lateral bearing 26 and the third lateral bearing 29, so as to raise the first lateral bearing 26. The translation means 39 are advantageously arranged between the second lateral bearing 27 and the fourth lateral bearing. 31, so as to lift the second lateral bearing 27.

To do this, the translation means 39 are preferentially in the form of a first device before 41, to spread by lifting, and reciprocally to bring down by lowering the first bearing 26 relative to the third bearing 27. The translation means 39 are preferentially in the form of a second rear device, to spread by lifting, and reciprocally to bring closer by lowering, the second bearing 27 relative to the fourth bearing 31.

Favorably, the device 41 comprises a cylindrical rod 42, vertical, substantially parallel to the front tie rods 33, and centered with respect to the axis of rotation 28 of the upper tool 16 and with respect to the axis of rotation 32 of the anvil 17. The rod 42 is slidable in a vertical rectilinear motion U and D, between the close position and the spaced apart position, and reciprocally between the spaced position and the close position. The rod 42 performs a maximum stroke (e in Figure 4) sliding U. The rod 42 thus reaches a high point, which corresponds to the desired and necessary gap between the upper tool 16 and the anvil 17, in order to achieve moving the two upper crowns 21 and 22.

An end or an upper face 43 of the rod 42 generally comes to bear against a lower face 44 of the first bearing 26. A first blind vertical cylindrical housing 46 is formed in a lower part of the first bearing 26, and opens at the of the lower face 44 of this first bearing 26. The lower part of the rod 42 with the upper end 43 thus fits in the first housing 46.

The device 41 preferably comprises an eccentric 48, positioned at the level of the third bearing 29. To obtain the sliding U and D, an end or a lower face 47 of the rod 42 can bear on the eccentric 48. A second housing cylindrical 49 is formed in an upper portion of the third bearing 29 and opens out at the upper face 51 of this third bearing 29. The lower part of the rod 42 with the lower end 47 is inserted into the second housing 49. The eccentric 48 is inserted at the bottom of the second housing 49.

The rod 42 is able to be actuated manually, by rotation of the eccentric 48. The eccentric 48 is rotatable (arrows Tu and Td in Figures 4 and 5) perpendicular to the rod 42 and the third bearing 29, ie in this case horizontally. The device 41 comprises means for manually actuating the rod 42. These means comprise a substantially horizontal axis extending the eccentric 48 and a rotary actuating button 52 provided with a finger 53, exiting at the outer face 54 of the third bearing 29, and fixed to the axis of the eccentric 48. The rear device comprises the same component parts.

According to the invention, a method of adjusting a radial gap 20 existing between two transformation tools, the upper tool 16 and the anvil 17, in the processing arrangement, ie cutting 14 for the band 2, comprises several successive steps.

In a first step, the operator releases the prestressing by loosening the clamping elements, ie in this case the nuts 34 and 37. The operator actuates the actuating buttons 52 by turning them Pu, a half turn into clockwise, and eccentric 48 turns Tu correspondingly (see Figures 4 and 6). This causes the rod 42 to slide upwards, and the first bearing 26 is directly pushed back by the predetermined distance, i.e. the distance e. In this second step, the first bearing 26 is pushed U of the third bearing 29 and the second bearing 27 is pushed back from the fourth bearing 31 by a predetermined distance e. This step of pushing the first bearing 26 of the third bearing 29, and the second bearing 27 of the fourth bearing 31, is implemented with two positions, a close position in which the two tools 16 and 17 cooperate with each other for the function of transformation, and a spaced apart position, in which the lateral position of the crown (s) 21 and 22 is modifiable.

This displacement U of the first bearing 26 thus creates the gap e between the upper tool 16 and the anvil 17, to allow adjustment of the radial gap 20 by subsequent displacement of one or more rings 21 and 22. In a third step, the operator modifies a lateral position of one or both rings 21 and 22.

The operator actuates the actuating knob 52 by turning it Pd by half a turn counterclockwise (see FIGS. 5 and 6), and the eccentric 48 turns Td correspondingly. This causes a sliding D of the rod 42 downwards, and a rapprochement of the first bearing 26. In a fourth step, the first bearing 26 is brought closer to the third bearing 29, and the second bearing 27 is close to the fourth bearing 31. This displacement U of the first bearing 26 and brings the upper tool 16 of the anvil 17, to help find the cutting function with the optimum radial gap 20.

In a fifth and final step, the operator puts back a prestressing by tightening the clamping elements, i.e. the nuts 34 and 37.

The present invention is not limited to the embodiments described and illustrated. Many modifications can be made, without departing from the scope defined by the scope of the set of claims.

Claims

A method of adjusting a radial gap (20) existing between two transformation tools (16, 17) of a planar support (2), in a transformation arrangement (18) for the support (2), comprising:

a first and a second rotating rotary cylindrical tool (16, 17), each equipped with two conical lateral bearing rings (21, 22, 23, 24), and arranged and cooperating with one another to transform the support (2),

a first and a second lateral bearing (26, 27), maintaining the first tool (16) for rotation (Rs),

a third and a fourth lateral bearing (29, 31), maintaining the second tool (17) for rotation (Ri),

- clamping elements (34, 37) of the first with the third bearing (26, 29), and the second with the fourth bearing (27, 31),

comprising the steps of:

- loosen the clamping elements (34, 37),

- pushing (U) the first bearing (26) of the third bearing (29), and the second bearing (27) of the fourth bearing (31) by a predetermined distance (e),

modifying (L) a lateral position of at least one of the rings (21, 22),

bringing (D) the first bearing (26) of the third bearing (29) and the second bearing (27) of the fourth bearing (31), and

- tighten the clamping elements (34, 37).

Method according to claim 1, characterized in that the step of pushing (U) the first bearing (26) of the third bearing (29), and the second bearing (27) of the fourth bearing (31) is implemented with two positions, a close position in which the two tools (16, 17) cooperate with each other, and a position apart, in which the lateral position of the crown (s) (21, 22, 23, 24) is modifiable (L).

Transformation arrangement for a plane support (2), comprising:

a first and a second rotary cylindrical transformation tool (16, 17), the two tools (16, 17) being arranged and cooperating with one another to transform the support (2), a first and a second lateral bearing (26, 27), maintaining the first tool (16) for rotation (Rs),

a third and a fourth lateral bearing (29, 31), maintaining the second tool (17) for rotation (Ri), and

characterized in that it comprises translation means (39) for spacing (U) by a predetermined distance (e), and reciprocally to bring (D), the first bearing (26) of the third bearing (29), and the second bearing (27) of the fourth bearing (31), in two positions, a close position, in which the two tools (16, 17) cooperate with each other, and a separated position, in which the two tools (16, 17) are adapted to be modified, so as to adjust a radial gap (20) between the two tools (16, 17).

Arrangement according to claim 3, characterized in that the first tool (16) is equipped with two conical side bearing crowns (21, 22) with changeable lateral position (L).

Arrangement according to Claim 3 or 4, characterized in that the translation means (39) are arranged between the first and third bearings (26, 29) and between the second and fourth bearings (27, 31).

Arrangement according to any one of claims 3 to 5, characterized in that the translation means (39) comprise two devices (41) for spacing (U), and reciprocally to bring (D) respectively the first bearing (26) the third bearing (29), and the second bearing (27) of the fourth bearing (31).

7. Arrangement according to claim 6, characterized in that the device (41) comprises a sliding rod (42) with rectilinear movement between the close position and the remote position.

8. An arrangement according to claim 7, characterized in that an upper end (43) of the rod (42) abuts against a lower face (44) of the first and second bearings (26, 27) respectively. 9. Arrangement according to claim 7 or 8, characterized in that the device (41) comprises an eccentric (38), and in that a lower end (47) of the rod (42) bears on the eccentric (38).

10. Arrangement according to any one of claims 7 to 9, characterized in that the device (41) comprises means (52, 53) for manually actuating the rod (42).

11. Arrangement according to any one of claims 3 to 10, characterized in that the first and the second tool is a cutting tool (16, 27), and / or a waste ejection tool.

12. Transformation cassette for a flat support (2), characterized in that it comprises a transformation arrangement (4, 9, 14) according to any one of claims 3 to 11. 13. Transformation unit for a flat support (2), characterized in that it is equipped with a conversion cassette (8, 13, 18) according to claim 12.

Transformation unit for a plane support (2), characterized in that it comprises at least one transformation arrangement (4, 9, 14) according to any one of claims 3 to 11.

15. Packaging production machine from a flat support (2), characterized in that it comprises a processing unit (1), according to claim 13 or 14. ·