EP3181312B1 - Adjustable arrangement for transforming a planar support, cassette, unit and machine provided with same - Google Patents

Description

The present invention relates to an adjustable 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 an adjustable transformation arrangement for the plane support. The invention relates to a processing unit for a plane support, which is equipped with a conversion cassette for the plane support. The invention relates to a processing unit for a plane support, comprising at least one adjustable transformation arrangement for the plane support. The invention also relates to a packaging production machine from a plane support, comprising a 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 firmly hold the first and third bearings, as well as the second and fourth bearings. 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 a quick change of the tools, depending on the transformations of the support to be made. 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 assembled and adjusted to be adapted function of the next transformation job. When changing the job, the operator takes out the old cassette and inserts the new cassette, minimizing machine downtime.

As a first example, one of the arrangements or one of the cassettes is respectively a rotary cutting arrangement or a rotary cutting cassette. A first cylindrical cutting tool is provided with knives, and a second cylindrical tool is smooth, and is called anvil. 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, however, must not 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.

Therefore, the optimal radial gap between the two rotating cylindrical tools is set in the micron. For this interval to be obtained accurately, each end of the two rotary cylindrical tools comprises a rolling crown. The rolling ring of one of the tools rolls on the rolling ring of the other tools (see document EP-0'764'505 ).

As a second example, one of the arrangements or one of the cassettes is respectively a rotary upset arrangement or a rotary upset cassette. A first cylindrical upset tool is provided with a male upset shape or die, and a second cylindrical tool is provided with a complementary female upset shape or die. The crushing must be clean, without breaking the edges or bottom of the upsetting. In this case, the optimum radial gap between the two rotating cylindrical tools is set in the hundredth.

State of the art

To obtain a first adjustment of the radial gap, the first and second bearings are respectively pressurized with jacks against the third and fourth bearings, in order to apply the desired cutting pressure while obtaining the radial gap. between the two tools.

The documents FR-2,452,372 , considered the closest state of the art, and EP-1'531'975 disclose an arrangement in which the interval between the four bearings is adjusted with two inclined-face wedges or spacers sliding between them.

However, such an arrangement does not give the possibility of adjusting the levels between the first and third bearings and between the second and fourth bearings.

Presentation of the invention

It is a principal object of the present invention, as defined in claim 1, to develop a processing arrangement for a planar support for a processing unit in a packaging production machine. A second objective is to achieve a rotary tooling transformation arrangement to obtain a simpler, more sensitive and therefore extremely accurate adjustment of the interval between the two tools. A third objective is to provide an arrangement for improving the reproducibility of the settings between the rotary tools. A fourth objective is to solve the technical problems mentioned for the arrangements of the state of the art. A fifth objective is to simplify and facilitate any change of tools in an arrangement, while simplifying and optimizing subsequent adjustments. 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 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. The transformation arrangement for the plane support comprises adjustment means in the form of spacers with inclined face and sliding between them. The spacers are used to adjust the gap between the first bearing and the third bearing. The spacers are used to adjust the gap between the second bearing and the fourth bearing. The spacers make it possible to adjust a radial gap between the first rotary cylindrical tool of transformation and the second rotary cylindrical tool of transformation.

According to one aspect of the present invention, the transformation arrangement for the planar support is characterized in that the adjustment means comprise two spacers which are interposed between the first and second lateral bearings, and two spacers which are interposed between the second lateral bearing and the fourth lateral bearing.

In other words, with two adjustable spacers for two bearings, the adjustment accuracy is much higher. The adjustment makes it possible to balance and adjust the level of each of the two bearings on one side and the other of the arrangement. Such settings allow to maintain an optimal transformation of the plane support throughout the production. Four adjustment possibilities are possible with four spacers. This multiplication of settings also simplifies the manufacture of bearings.

According to the present invention, the transformation arrangement for the plane support is characterized in that the spacer is moved by a differential screw having a first external thread, cooperating with a first internal thread of a part integral with the first one. lateral bearings, and a second external thread, different from the first external thread and cooperating with a second internal thread of the spacer.

In other words, with such a spacer screw, the adjustment can be made much more accurately, depending on the size characteristics of the selected threads. Such a setting makes it possible to obtain and maintain a high quality transformation of the planar support throughout the production.

A fine adjustment makes it possible to progressively compensate for the wear of one or more rotary cylindrical tools of transformation that occur as and when they are used. The service life of the tool or tools is increased. An optimized setting also allows for simpler bearings to manufacture, requiring less machining precision. Fine and precise adjustment reduces the adjustment time of the radial gap between the two tools.

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.

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

• la Figure 1 représente une vue latérale synoptique d'une unité de transformation;
• la Figure 2 représente une vue isométrique d'une cassette munie d'un agencement de transformation selon l'invention;
• la Figure 3 représente une vue latérale partielle de la cassette de la Figure 2;
• la Figure 4 représente une vue isométrique partielle des moyens d'ajustement; et
• les Figures 5 et 6 représentent une vue en coupe longitudinale partielle des moyens d'ajustement respectivement avec un premier et un deuxième écart.

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:

• the Figure 1 represents a synoptic side view of a transformation unit;
• the Figure 2 represents an isometric view of a cassette provided with a transformation arrangement according to the invention;
• the Figure 3 represents a partial side view of the cassette of the Figure 2 ;
• the Figure 4 represents a partial isometric view of the adjustment means; and
• the Figures 5 and 6 represent a partial longitudinal sectional view of the adjustment means respectively with a first and a second gap.

Detailed description of preferred embodiments

A packaging production machine (not shown) processes a material or a flat support, which is in this case a continuous web support, for example flat cardboard. As illustrated by Figure 1 , the machine comprises a processing unit of a support 1 to transform the strip 2. The direction of advance or scroll (arrow F in Figure 1 ) of the strip 2 and the strip transformed in the longitudinal direction indicates the upstream direction and the downstream direction in the unit 1. The front and rear positions are defined with respect to the transverse direction, 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 with a constant speed by its transverse side upstream. 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.

The unit 1 delivers poses or transformed boxes 3, being therefore in cardboard embossed, repressed and cut. The boxes 3 leave the unit 1 with the same constant speed by its transverse side downstream. 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 upset cassette 13 comprises the upset arrangement 9.

The unit 1 comprises a third arrangement providing the cutout 14, disposed downstream of the upset arrangement 9, ie at the output of this unit 1. The cutting arrangement 14 is equipped with a upper rotary cutting tool 16, positioned parallel to a lower rotary cutting tool 17. In 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, upsetting 11 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 Figure 2 ) upper embossing tools 6, upsetting 11, and cutting 16 is reversed relative to the direction of rotation (arrow Ri in Figure 2 ) lower embossing tools 7, upsetting 12, and cutting 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 19. 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 thus the cutting cassette 18, comprises (see Figure 2 ) the cylindrical upper rotary tool 16 provided with cutting threads (not shown) machined or reported on its circumference according to the configuration of boxes to achieve. The cylindrical lower rotary tool or anvil 17 has a smooth circumference. The band 2 scrolls F in 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, ie cut the band 2.

The upper tool 16 is provided at each of its ends with a rolling ring 21, respectively 22. The anvil 17 is provided at each of its ends with a rolling ring 23, respectively 24. The rolling crowns 21 and 22 of the upper tool 16 come into contact, bear on, and roll on the opposite bearing rings 23 and 24 of 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 now 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 fourth lower rear bearing 31 for rotation the second tool, ie the anvil 17 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 thereby the cutting cassette 18, comprises driving means for rotating the two tools 16 and 17. These means are formed with a first upper gear 33 for the upper tool 16 This first gear 33 meshes with a second lower gear 34 for the anvil 17 fixed at the rear on its axis of rotation 32. When the cassette 18 is inserted into the frame 19, the teeth of the first pinion 33 come into mesh with the teeth of a conjugated pinion of an electric motor for rotating drive.

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 maintain the cassette 18 in one piece, elements, in the form of four tie rods 36, upstream forward, downstream front, rear upstream, and rear downstream, cross vertically respectively 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 front and rear tie rods 36 is threaded and is screwed in a thread respectively of the lower front bearing 29 and the lower rear bearing 31. Four nuts 37, upstream front, downstream front, rear upstream, and rear downstream, are respectively screwed on the upper end The nuts 37 block the tie rods 36 by pressing on an upper face respectively of the upper front bearing 26 and the upper rear bearing 27 and allow to preload them.

The cutting cassette 18, as well as the embossing cassette 8 and upset 13, comprise two gripping tabs 41 each provided at the upper face of the upper front bearing 26 and the upper rear bearing 27. The two tabs 41 are intended to cooperate with lifting means for lifting and transporting the cassette 8, 13 and 18.

In order to ensure satisfactory operation of the cutting cassette 18 or the rotary cutting arrangement 14, a careful adjustment of the distance between the upper tool 16 and the anvil 17 is required. , adjustment means 42 are interposed between the first upper front bearing 26 and the third lower front bearing 29, and between the second upper rear bearing 27 and the lower lower rear bearing 31.

The adjustment means 42 comprise spacers, in this case similar to wedges, which are slidably movable. According to the invention, four spacers 43, 44, 46 and 47 are provided. A front upstream spacer 43, a downstream front spacer 44, a rear upstream spacer 46 (visible by transparency in Figure 2 ) and a rear downstream spacer 47 allow four different settings, front and rear, upstream and downstream.

By moving the spacers 43, 44, 46 and 47, a gap e (see Figure 4 ) varies, upstream and downstream, between the first bearing 26 and the third front bearing 29 and between the second bearing 27 and the fourth rear bearing 31. The gap e is obtained due to an upper inclined face 48 of the 43. The horizontality adjustments in the longitudinal direction and in the transverse direction are possible with the four spacers 43, 44, 46 and 47.

As shown in the Figures 3 and 4 , the spacer 43 is in the form of a metal shim with two branches 49 and 51, leaving a space to pass the corresponding tie rod 36. The two branches 49 and 51 of the spacer 43 are pressed against the face upper portion of the lower front bearing 29. The two branches 49 and 51 have the upper inclined face 48.

An intermediate piece 52, also with two branches 53 and 54, is favorably secured to the lower face of the first upper bearing 26 or the second upper bearing 27. The two branches 53 and 54 of the intermediate part 52 comprise an opposite lower inclined face 56 corresponding to the upper inclined face 48 of the spacer 43.

Sliding (Arrow S in Figures 5 and 6 ) of the spacer 43 between the third lower bearing 29 or the fourth lower bearing 31 and the intermediate part 52 makes it possible to adjust the distance e, the upper inclined face 48 being pressed against the opposite lower inclined face 56 with different possible positions (see Figures 5 and 6 ).

The action to adjust the gap e is defined as the action to fill the gap e between the bearings 26, 27, 29 and 31, in the case of the cutting tools 16 and 17, the adjustment of the gap 20 being obtained by the rolling crowns 21, 22, 23 and 24. The action to adjust the gap e is defined as the action to adjust the gap e of the precise interval 20 in the case of the tools. embossing 6 and 7 and upsetting 11 and 12.

In the Figure 5 the spacer 43 is at the bottom relative to the spacer part 52, and therefore the gap e1 is the smallest. In the Figure 6 , the spacer 43 is advanced relative to the spacer part 52, and therefore the difference e2 is greater, greater than the smallest gap e1.

According to the invention, the spacer 43 is slidably displaced by a screw 57. The screw 57 is advantageously a differential screw which has a first external thread 58 cooperating with a first internal thread 59 of a portion 61 secured to the bearing. The screw 57 mechanically connects the sliding spacer 43 to the stationary portion 61. The screw 57 has a second external thread 62 cooperating with a second internal thread 63 formed in the moving spacer 43. The two threads 58 and 62, and their corresponding threads 59 and 63, allow a fine adjustment of the gap e, in depending on the pitch difference chosen. The step difference corresponds to the desired sensitivity for the setting. The screw 57 has a different diameter at the two threads 58 and 62. The second thread 62 has a larger diameter than the first thread 58. When the screw 57 is turned (Arrow T in Figure 4 ) and progress in one direction, the spacer 43 progresses S in the same direction.

The spacers 43, 44, 46 and 47, and the spacer part 52 have an elongated shape. The inclined face 48 of all the spacers 43, 44, 46 and 47, and consequently the inclined face 56 of the intermediate part 52, is preferably oriented in the longitudinal direction. In other words, the long length of the spacers 43, 44, 46 and 47 and the intermediate part 52 is parallel to the longitudinal direction. The access to the screws 57 is done upstream and downstream of the arrangement 14 and / or the cassette 18, which is more ergonomic for the operator.

The cutting arrangement 14 furthermore advantageously comprises a planar wedge with a predefined thickness 64, interposed between the first upper bearing 26 or the second upper bearing 27 and the intermediate piece 52 with an inclined face 56. The plane shim 64 makes it possible to adapt when using cylinders 16 and 17 of different diameters.

With a more ergonomic processing unit 1, the risk of error is greatly reduced, which consequently leads to a reduction in non-compliant or non-optimal boxes.

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 (11)

1. Converting arrangement for a flat substrate (2), comprising:

   - first and second cylindrical rotary converting tool (16, 17), configured and able to cooperate to convert the substrate (2),

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

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

   - adjustment means (42) in the form of spacers (43, 44, 46, 47) with inclined face (48) and slidable (S) to adjust the respective gap (e, e1, e2) between the first and third bearing (26, 29) and between the second and fourth bearing (27, 31), so as to adjust a radial gap (20) between the two tools (16, 17),

   characterised in that the spacer (43) is displaced (S) by differential screw (57) having a first thread (58) cooperating with a threading (59) of a portion (61) solid with one of the bearings (29), and a second thread (62), different from the first thread (58) and cooperating with a threading (63) of the spacer (43).
2. Arrangement according to claim 1, characterised in that the adjustment means (42) comprise two spacers (43, 44) inserted between the first and third bearing (26, 29), and two spacers (46, 47) inserted between the second and fourth bearing (27, 31).
3. Arrangement according to any one of the previous claims, characterised in that the threads (58, 62) of the screw (57) have different pitches.
4. Arrangement according to any one of the previous claims, characterised in that the inclined face (48) of the spacer (43) is oriented in the longitudinal direction.
5. Arrangement according to any one of the previous claims, characterised in that the spacer (43, 44, 46, 47) slides (S) respectively between the third or fourth bearing (29, 31) and a part (52) with inclined face (56) solid with the first or second bearing (26, 27).
6. Arrangement according to claim 5, characterised in that it also comprises a flat shim with predefined thickness (64) inserted between the first or second bearing (26, 27) and the part (52) with inclined face (56).
7. Arrangement according to any one of the previous claims, characterised in that the first and second tool is a cutting tool (16, 17), and/or an embossing tool (6, 7), and/or a creasing tool (11, 12), and/or a waste ejection tool.
8. Converting cassette for a flat substrate (2), characterised in that it comprises a converting arrangement (4, 9, 14), according to any one of the previous claims.
9. Converting unit for a flat substrate (2), characterised in that it is equipped with at least one converting cassette (8, 13, 18), according to claim 8.
10. Converting unit for a flat substrate (2), characterised in that it comprises at least one converting arrangement (4, 9, 14), according to any one of claims 1 to 7.
11. Machine for producing packaging from a flat substrate (2), characterised in that it comprises a converting unit (1), according to claim 9 or 10.

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