EP2030934B1 - Device for driving one or more superimposed bands for rotary press and rotary press - Google Patents

Abstract

The device (18) has contra-rotating rollers (20A, 20B) for pinching print tapes and for scrolling the tapes by rotation of the rollers. The rollers respectively have two sets of cylindrical support faces (22A, 22B, 24A, 24B) that are spaced, where the sets of support faces define pinch zones (Z1, Z2) of the tapes with the support faces, respectively. The rollers are displaceable relative to each other along a direction of rotational axes (A1, A2), where the displacement of the rollers modifies a gap between the zones.

Description

The invention relates to a device for driving one or more printing belts for use in a rotary press, of the type comprising two counter-rotating rolls of substantially parallel axes of rotation, intended to clamp the strip or strips. ) between them and scroll the band (s) because of their rotation, each roller having two spaced cylindrical bearing surfaces each defining a nip area of the band (s) with a corresponding bearing surface from the other facing roller.

Drive devices of this type define two spaced nip zones. They are generally arranged downstream of printing units, so as to pinch unprinted marginal regions of the band (s), to avoid pinching the printed regions, which could spread ink still wet, see for example US 2004/0050895 .

It is advantageous that a rotary press can receive printing strips of different widths, and therefore to be able to change the spacing between the nip areas.

An object of the invention is to provide a drive device for one or more superimposed printing strips, intended to be used in a rotary press, and for easily modifying a spacing between the nip regions.

For this purpose, the subject of the invention is a device for driving one or more printing belts of the aforementioned type, characterized in that the rollers are movable relative to one another in the direction of the axes of the machine. rotation, and in that a displacement of one of the rollers relative to the other in the direction of the axes of rotation changes a gap between the nip regions.

• au moins un des rouleaux est monté coulissant suivant son axe de rotation,
• chaque rouleau est monté coulissant suivant son axe de rotation,
• chaque zone de pincement conserve la même largeur lors d'un déplacement axial relatif des rouleaux, sur au moins une plage de réglage,
• chaque rouleau possède une surface d'appui plus large que la surface d'appui correspondante de l'autre rouleau,
• chaque rouleau possède une surface d'appui plus large que l'autre,
• les surfaces d'appui de petite largeur des rouleaux possèdent la même largeur,
• les surfaces d'appui de grande largeur des rouleaux possèdent la même largeur,
• chaque rouleau possède un arbre et des bagues montées de façon amovible sur l'arbre à une position déterminée, chaque bague définissant une des surfaces d'appui du rouleau.

According to other embodiments, the driving device comprises one or more of the following characteristics, taken in isolation or in any technically possible combination:

• at least one of the rollers is slidably mounted along its axis of rotation,
• each roller is slidably mounted along its axis of rotation,
• each niping zone keeps the same width during a relative axial displacement of the rollers, over at least one adjustment range,
• each roll has a bearing surface wider than the corresponding bearing surface of the other roll,
• each roll has a greater support surface than the other,
• the narrow bearing surfaces of the rollers have the same width,
• the large bearing surfaces of the rollers have the same width,
• each roller has a shaft and rings removably mounted on the shaft at a determined position, each ring defining one of the bearing surfaces of the roller.

The invention also relates to a rotary press, characterized in that it comprises at least one folding cone and a drive device as defined above, arranged downstream of the folding cone to hold one or more superposed strips in tension on the folding cone.

• la figure 1 est une vue d'ensemble latérale schématique d'une presse rotative ;
• la figure 2 est une vue de face d'une unité de pliage longitudinal (ou plieuse longitudinale) de la presse de la figure 1 ;
• les figures 3 et 4 sont des vues de dessus d'un dispositif d'entraînement conforme à l'invention de l'unité de pliage de la figure 2 ; et
• la figure 5 est une vue de détail du dispositif d'entraînement des figures 3 et 4.

The invention and its advantages will be better understood on reading the description which follows, given solely by way of example, and with reference to the appended drawings, in which:

• the figure 1 is a schematic side view of a rotary press;
• the figure 2 is a front view of a longitudinal folding unit (or longitudinal folder) of the press of the figure 1 ;
• the Figures 3 and 4 are views from above of a drive device according to the invention of the folding unit of the figure 2 ; and
• the figure 5 is a detailed view of the training device of the Figures 3 and 4 .

The rotary press 2 shown on the figure 1 allows the printing of several strips 4 of material, for example strips of paper, and their meeting to form a product such as a newspaper.

The press 2 comprises, for each band 4, a reeling unit 6 for unwinding the band 4 from a supply reel, and at least one unit 8 only to print the web 4. Only the unwinding unit 6 and a printing unit 8 on both sides of a strip 4 have been represented on the web. figure 1 for the sake of clarity.

The press 2 has a longitudinal folding unit 10 receiving several bands 4 after their printing.

The folding unit 10 has, from upstream to downstream, a collection device 12 for collecting a plurality of strips 4 and joining them together into a set 14 formed by the superimposed strips, a longitudinal folding cone 16 to form a fold longitudinally in the assembly 14, a pair of guide roller 17, and a driving device 18 for driving the assembly 14 and keeping it in tension between the collecting device 12 and the driving device 18.

The collection device 12 has in known manner a collection roll 13A and upper collection rollers 13B defining between them a single passage for the strips 4 coming from different directions, so as to form the assembly 14.

The collecting roller 13A extends transversely to the strips 4, has a cylindrical surface extending over the entire width of the strips. It is generally motorized to drive bands 4.

The rollers 13B are provided for pressing the assembly 14 against the collecting roller 13A. The rollers 13B are spaced to press unprinted areas of the strips 4 of the assembly 14. In known manner, the rollers 13B are carried by arms, themselves carried by a common shaft.

As shown on the figure 2 , the folding cone 16 is formed in a known manner by a substantially triangular plate having a transverse rear edge and two lateral edges forming a front tip directed downstream, around which two folds of the assembly 14 are deflected, so that the front tip forms a longitudinal fold between the two folds.

The pickup roller 13A is disposed along the trailing edge of the folding cone 16. The pickup roller 13A is generally referred to as a "roller top of the form" or "RTF" for short.

The folding cone 16 has in known manner pressurized air injection nozzles to form a film of air between it and the assembly 14, to limit friction.

The guide rollers 17 are arranged on either side of the assembly 14 folded substantially at the height of the tip of the cone 16. The guide rollers 17 are arranged substantially transversely to the running direction of the assembly 14 folded into downstream of the cone 16. They are mounted free in rotation.

Each guide roller 17 guides one of the folds of the assembly 14 to ensure proper winding of this fold around the corresponding lateral edge of the cone 16. The guide rollers 17 do not pinch the assembly 14 between them.

The driving device 18 comprises a first roller 20A and a second counter-rotating roller 20B respectively with parallel axes of rotation A1 and A2, designed to pinch the assembly 14 folded and run between them because of their rotation.

Such rollers 20A and 20B, located downstream of the guide rollers 17 for driving, and maintaining in tension the band or the plurality of bands passing over the folding cone, are generally called "rollers of call ".

As shown on the Figures 3 and 4 , the rollers 20A, 20B define between them two nipping zones Z1, Z2 spaced in the direction of the axes A1, A2 of the rollers 20A, 20B.

The nip zones Z1, Z2 spaced allow to pinch the assembly 14 in unprinted marginal regions, to limit the risk of burr formation by spreading ink still wet deposited on the strips 4.

In known manner, the rollers 20A and 20B are rotated in opposite directions by one or more motors.

The first roller 20A has a bearing surface 22A of small width, and a bearing surface 24A of large width, spaced along the axis A1. The bearing surfaces 22A and 24A are cylindrical with axis A1 and have the same diameter.

The second roller 20B has a bearing surface 22B of small width, and a bearing surface 24B of large width, spaced along the axis A2. The bearing surfaces 22B and 24B are cylindrical with an axis A2 and have the same diameter.

By "width" of a bearing surface is meant the dimension of this bearing surface in the direction of the axes of rotation of the rollers 20A and 20B.

The bearing surfaces 22A, 22B of small width of the rollers 20A, 20B have the same width I and the bearing surfaces 24A, 24B of large width of the rollers 20A, 20B have the same width L.

The rollers 20A, 20B are arranged head to tail, so that the bearing surface 22A of small width of the roll 20A and the bearing surface 24B of large width of the roll 20B are arranged opposite and define the clamping zone Z1 and the wide bearing surface 24A of the roll 20A and the narrow bearing surface 22B of the roll 20B are disposed facing each other and define the nip zone Z2.

The width of the nip zones Z1, Z2 is equal to the width I of the bearing surfaces 22A, 22B of small width.

The spacing E between the nip zones Z1, Z2 is equal to the distance in the direction of the axes A1 and A2 between the bearing surfaces 22A, 22B of small width of the rollers 20A, 20B.

The rollers 20A, 20B are movable relative to each other in the direction of the axes A1 and A2, as illustrated by the double arrow F on the Figures 3 and 4 .

The displacement of one of the rollers 20A, 20B as a whole relative to the other causes a joint displacement of the bearing surfaces of this roll relative to the bearing surfaces of the other roll. Such a displacement modifies the distance E between the gripping zones Z1 and Z2.

The rollers 20A, 20B are movable between a first position of maximum spacing E ( figure 3 ) and a second position of spacing E minimum ( figure 4 ).

In the first position ( figure 3 ), the bearing surface 22A, 22B of small width of each roller 20A, 20B is located facing the axial end segment of the respectively large bearing surface 24B, 24A of the other roller 20B respectively, 20A, opposite to the bearing surface 22B, 22A respectively small width of the other roller 20B, 20A respectively.

In the second position ( figure 4 ), the bearing surface 22A, 22B of small width of each roll 20A, 20B is located opposite the end segment axial of the bearing surface respectively 24B, 24A of large width of the other roller respectively 20B, 20A, adjacent to the bearing surface 22B, 22A respectively small width of the other roller 20B, 20A respectively.

In the first position ( figure 3 ), the bearing surfaces 24A, 24B are close together but do not overlap to avoid pinching the assembly 14 between the bearing surfaces 24A, 24B.

The rollers 20A, 20B can be immobilized in position relative to each other in the direction of their axes A1 and A2, to maintain the spacing E chosen.

The variable spacing E between the gripping zones Z1 and Z2 allows the driving of the strips of different widths. The adjustment of the spacing E is done easily, simply by moving one of the rollers 20A, 20B with respect to the other.

In addition, because of the provision of bearing surfaces 22A, 22B, and 24A, 24B of different widths I and L, respectively, and their distribution in opposition (roll 20A and 20B arranged head to tail), the adjustment of the The gap E does not change the width of the nip zones Z1, Z2, at least over a range of adjustment of the gap E equal to the difference between the large width L and the small width I.

It is therefore possible to reliably drive the band or strips moving between the rollers 20A, 20B, without overflowing on the printed areas of the band (s). The width of the nip zones Z1 and Z2 is preferably between 10 and 20 mm.

The gap E is adjusted if necessary during a change of belt (s) for bands of different width, for the printing of different products. Spacing is also possibly changed during printing if a gap setting is detected.

As shown on the Figures 3 and 4 , the rollers 20A has a rotary shaft 26A of axis A1, a ring 28A of small width defining the bearing surface 22A of small width, and a ring 30A of large width defining the bearing surface 24A of large width. The rings 28A and 30A are removably mounted on the shaft 26A, each at a determined location along the shaft 26A.

Similarly, the roller 20B has a rotary shaft 26B of axis A1, a small-width detachable ring 28B defining the bearing surface 22B of small width, and a large-width removable ring 30B defining the bearing surface 24B wide

This allows the replacement of the rings 28A, 30A, 28B and 30B after a determined wear without replacing the rollers 20A, 20B as a whole.

The bearing surfaces 22A, 22B, 24A and 24B are advantageously provided on tungsten coatings, a very wear-resistant but expensive material. Nevertheless, the arrangement of the opposing large width and small width bearing surfaces allows easy adjustment of the gap E with rings of limited length, which limits the amount of coating required.

To allow the displacement and the adjustment in relative position of the rollers 20A, 20B, as represented on the Figures 3 and 4 , the first roller 20A is slidably mounted along its axis A1, and the second roller 20B is fixed in translation along its axis A2.

As shown on the figure 5 illustrating one of the axial ends of the shaft 26A of the roller 20A, said end of the shaft 26A is rotatably mounted on a frame 32 of the device 18 via a bearing bearing 34 of axis A1 allowing displacement relative axial between the shaft 26A and the frame 32.

For this purpose, the rolling bearing 34 comprises an outer ring 36 fixed on the frame 32, an inner ring 38 fixed to the shaft 26A and rolling elements 40 disposed between the outer ring 36 and the inner ring 38.

The rolling elements 40 are locked axially with respect to the outer ring 36. The inner ring 38 has a rolling track for the rolling elements 40 axially longer than the rolling elements 40.

The lubrication present in the rolling bearing 34 allows the inner ring 38 to slide along the axis A1 with respect to the outer ring 38, as illustrated by the double arrow F.

The other end of the shaft 26A is rotatably mounted on the frame 32 by means of a second rolling bearing of the type of the rolling bearing 34.

The drive device 18 comprises a device 41 for adjusting the axial position of the roller 20A. The axial position adjusting device 41 comprises a screw-nut system 42 of axis A1 and an axial thrust bearing 44 disposed between the screw-nut system 46 and the roller 20A

The screw-nut system 42 has a screw 46 disposed along the axis A1, and a nut 48 engaged on the screw 46. The screw 46 is locked in rotation about the axis A1 relative to the frame 32, and movable in translation along the axis A1 relative to the frame 32. The nut 48 is stationary in translation along the axis A relative to the frame 32, and rotatable about the axis A1 relative to the frame 32.

The rotation of the nut 48 around the axis A1 makes it possible to adjust the position of the screw 46 and therefore of the shaft 26A with respect to the frame 32 along the axis A1. The adjustment of the axial position of the shaft 26A is continuous. The choice of an irreversible screw-nut system 42 keeps the shaft 26A immobile in translation along the axis A1 when the nut 48 does not rotate.

The rotation of the nut 48 is controlled manually, for example by means of a control wheel coupled to the nut by gears, or with the aid of an actuator, for example an electric motor coupled to the 'nut by gears, as shown schematically on the figure 5 .

In a variant, each roller 20A, 20B is axially displaceable and adjustable in position along its axis of rotation.

The adjustment of the distance E by relative axial displacement of the rollers 20A and 20B as a whole allows an easy adjustment of the gap E, without intervention requiring disassembly of the device 18, and possibly without stopping the press 2.

The drive device 18 has been described disposed downstream of a folding cone receiving several bands joined together. Of course, it is possible to arrange the drive device downstream of a folding cone receiving a single band, and downstream of a folding cone receiving one or more partial bands (s) superimposed formed from one or more superimposed strips cut in the longitudinal direction to form a plurality of partial strips or several partial sets of superimposed strips, directed to different folding cones.

Moreover, only the functional units of the press 2 necessary for understanding the invention have been represented. The press 2 optionally includes, in known manner, other functional units, such as drying the strips after printing, cooling units of the strips after drying, or longitudinal cutting units, generally located upstream of the longitudinal folding cone, or transverse folding or stapling units, generally located downstream of the cone of longitudinal folding.

Claims (10)

1. Device for driving one or more printing webs (4) which is to be used in a rotary press (2), of the type comprising two counter-rotating rollers (20A, 20B) which have substantially parallel axes of rotation (A1, A2) and which are provided to grip the web(s)(4) between them and to cause the web(s) (4) to move along as a result of their rotation, each roller (20A, 20B) having two spaced cylindrical support surfaces (22A, 24A; 22B, 24B), each defining a zone (Z1, Z2) for gripping the web(s) with a corresponding, opposing, support surface of the other roller,
   characterized in that the rollers (20A, 20B) are displaceable relative to each other in the direction of the axes of rotation (A1, A2), and in that a displacement of one of the rollers (20A, 20B) relative to the other in the direction of the axes of rotation modifies a distance (E) between the gripping zones (Z1, Z2).
2. Drive device according to claim 1, characterized in that at least one of the rollers (20A) is mounted to slide along its axis of rotation (A1).
3. Drive device according to claim 1 or 2, characterized in that each roller (20A, 20B) is mounted to slide along its axis of rotation (A1, A2).
4. Drive device according to any one of the preceding claims, characterized in that each gripping zone (Z1, Z2) preserves the same width during a relative axial displacement of the rollers (20A, 20B), over at least one range of adjustment.
5. Drive device according to any one of the preceding claims, characterized in that each roller (20A, 20B) has a support surface (24A, 24B) wider than the corresponding support surface (22B, 22A) of the other roller.
6. Drive device according to any one of the preceding claims, characterized in that each roller (20A, 20B) has one support surface (24A, 24B) wider than the other (22A, 22B).
7. Drive device according to claim 6, characterized in that the small-width support surfaces (22A, 22B) of the rollers (20A, 20B) have the same width (l).
8. Drive device according to claim 6 or 7, characterized in that the large-width support surfaces (24A, 24B) of the rollers (20A, 20B) have the same width (L).
9. Device according to any one of the preceding claims, characterized in that each roller has a shaft and rings mounted removably on the shaft at a predetermined position, each ring defining one of the support surfaces of the roller.
10. Rotary press, characterized in that it comprises at least one folding former (16) and a drive device (18) according to any one of the preceding claims, located downstream of the folding former (16) in order to keep a web or several superposed webs under tension on the folding former (16).

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