EP1136411B1 - Folding apparatus with combined cutting and clamping cylinder - Google Patents

Abstract

The appliance has cutter/clamp devices (101,102) to make first and second cuts for a continuous cut in a material length (1), forming a signature with smooth edges. A second of the cutter/clamp devices has a second cutter cylinder (10) with second cutter elements (19), acting with a second anvil cylinder (20). The cylinder has a peripheral coating of elastic material, which clamps and guides the material length in a gap between second anvil cylinder and second cutter cylinder, while second cuts are made.

Description

The present invention relates to a folder in a web-fed rotary offset printing press according to the preamble of claim 1.

Web-fed rotary printing machines print on a continuous web, e.g. made of paper. The continuous web is cut in a header of a folder to form signatures which are then folded or dispensed.

US 5,740,709 describes a double-cut folder. The cutting cylinders perform in the described folder during the cutting process by no clamping, resulting in the described device has the problem that it may cause relative movements in the signatures during the cutting process, which usually lead to stepped cutting edges.

In US 4,957,280 a folding apparatus is described in which a web is first partially cut by a first cutting drum and then passed between a folding drum and conveyor belts. The part of the web which has not been cut by the first cutting drum is then severed by saw-toothed cutting knives of a second cutting device which is arranged on the folding drum in such a way that a completely separated sheet is obtained. A front end of the web which is cut into sheets is for this purpose pressed and clamped in gaps between a plurality of clamping elements and clamping seats. In the device described slip can occur both in the web direction, as well as in the web transverse direction, since the clamping forces between the conveyor belts and the folding drum are often not sufficiently large. This results in the risk that a stepped cut edge on the signatures arises when they move during the cutting process. The cutting accuracy can be additionally affected due to the so-called radius effect when multi-layer paper webs and with different web thicknesses pass through the folder. In addition, the device described requires a rather complicated arrangement of clamping elements in order to to be able to control the location of the signatures. Furthermore, there is the problem that the surfaces of the grooves cooperating with the cutting blades are subject to high wear, since the blades come into contact with the grooved strips substantially always at the same location.

Applicant's non-prepublished European patent application EP 1097892 discloses a cutting device comprising a revolving conveyor belt with an integrated cutting blade, in which a first cut is made by a first cutting cylinder and subsequently a second cut by a second cutting cylinder having cutting wheels. The conveyor belts or belts have portions of different cross-sectional thickness and pass between the cutting discs correspondingly provided with corresponding recesses to grasp the cut signatures and divert the signatures into two streams. The straps grasp the leading edge of the signature after the second cut and thus do not help to maintain the position of the signature during the second cut in a controlled manner.

EP 0449006 discloses a folder according to the preamble of claim 1.

The invention is accordingly based on the object to provide a device for the controlled cutting of signatures, with which the accuracy with respect to the "cut-to-cut" measure and the "pressure-to-cut" -Maßes, that is the so-called Cut register, is improved.

This object is achieved by the features of claim 1.

According to the present invention, a folding apparatus has a first cutting and clamping device for partially cutting a printing material web, in particular a printed paper web, in which a first series of juxtaposed cuts is introduced into the web and at the same time the web is clamped by the clamping device becomes. The folder further comprises a second cutting and clamping device which clamps the web between the first cuts in the Cleaves and clamps at the same time that signatures are formed with smooth, non-stepped cutting edges.

By clamping the web between the first and second cutting devices, the cutting accuracy of both cut-to-cut and print-to-cut can be maintained with high reliability at all times.

The first cutting and clamping device according to the preferred embodiment of the invention comprises a first cutting cylinder having a clamping surface and at least one first segmented cutting element provided with axially spaced cutting surfaces or cutting surfaces. The clamping surface extends in the circumferential direction between the cutting surfaces. The first cutting and clamping device further comprises a first anvil cylinder, which performs a function of a grooved rail coating of elastic material, for. As rubber, which cooperates with the cutting surfaces and the clamping surfaces of the first cutting cylinder to form a first gap.

The second cutting and clamping device preferably comprises a second cutting cylinder with a clamping surface or clamping surface and at least one segmented second cutting element, which, seen in the axial direction, has cutting surfaces or cutting surfaces arranged at a distance from one another. The second cutting element extends in the circumferential direction between the clamping surfaces of the second cutting cylinder. A second anvil cylinder forms a second gap with the clamping surfaces or clamping surfaces of the second cutting cylinder and thus acts as an anvil or counter-cylinder for the second segmented cutting element of the second cutting cylinder.

The folder preferably comprises a plurality of first belts or conveyor belts and a plurality of second belts or conveyor belts, the web at the first interfaces, ie the first nip of the first and second belts Belt is held. The second grooved cylinder and the second cutting cylinder of the second cutting and clamping device are preferably provided with at least one axially spaced groove between the clamping surfaces of the second cutting and clamping device, the belts passing through the grooves.

The clamping surfaces - or generally the clamping elements - of the first and / or second cutting cylinder and the first and / or second anvil cylinder are preferably made of urethane or have a coating of urethane. As recognized by the applicant in connection with the invention, urethane is particularly advantageous as a groove or anvil surface of the anvil cylinder, which interacts directly with the cutting element of the associated cutting cylinder, and also has a very advantageous behavior as a clamping surface, which ensures a positionally accurate hold of the web / signatures during the cutting process. Nevertheless, other materials for coating the clamping surfaces, such as silicone or a similar rubbery material, can be used.

The first and / or second cutting cylinder according to the invention preferably has a hub made of metal, to which at least one segmented cutting element is preferably fastened by means of screws or bolts. The remainder of the cutting cylinder is formed by urethane or other similar material which is bonded to the hub, for example glued or vulcanized onto the hub.

The first and / or second anvil cylinders may equally comprise a metal body / hub having a urethane outer surface or other clamping material affixed, preferably glued or vulcanized, to the body.

The cutting cylinder preferably comprises two segmented cutting elements, which are arranged offset by 180 degrees to each other.

In the preferred embodiment of the invention, the first and / or the second anvil cylinder is indixierbar in the circumferential direction, d. H. rotatable relative to an associated angular position relative to the associated cutting cylinder to ensure that the associated segmented cutting blade after a certain number of cutting operations with a fresh new area of the urethane surface of the anvil cylinder cooperates, so that excessive wear in only a single point of the Anvil cylinder is avoided by successive further rotation of the same. For example, it is conceivable to continue turning the anvil cylinder by 2 or 3 degrees of angle after about 1000 cutting operations, with the remaining rotating components of the folder maintaining their original position. By the stepwise or stepwise process of the anvil cylinder after a certain number of cutting operations or print jobs this can - compared with a conventional anvil cylinder, which is also commonly referred to as grooved cylinder, and in which the grooved rails always remain in the same place - over a longer period of time remain without significant loss of cutting performance or transport behavior in use.

The distance from the center of the cutting cylinder to the center of the anvil cylinder of the cutting and clamping devices is preferably adjustable so that the clamping function can be adjusted, e.g. for processing different webs of different thickness. The adjustment is preferably applied with a force, e.g. by means of springs, so that the device automatically compensates for the removal of the centers of the cutting cylinder and the anvil cylinder when the jacket thickness changes.

The first and / or second cutting cylinder and the associated anvil cylinder are preferably cantilevered to allow easy replacement of the belts.

The present method provides a two- or double-cut arrangement which enables the web to be held during the first and second cutting operations in a clamped predetermined position, thereby increasing the tension and accurate alignment of the web Track, or the signatures can be met during the cutting process with very high accuracy.

The present device is particularly preferably suitable for use in conjunction with web-fed rotary printing presses operating at a high speed, e.g. Printing machines that operate at more than about 610 m per minute, since the web and the cut signatures are held and precisely guided even at high speeds due to the clamping operation on the first and second cutting and clamping device. The web and the knives work exactly together.

A preferred embodiment of the present invention will be described below with reference to the drawings.

Fig. 1

eine Seitenansicht des Falzapparats einer erfindungsgemäßen Rollenrotations-Offsetdruckmaschine,

Fig. 2

eine detaillierte Ansicht einer Schneid- und Klemmvorrichtung des Falzapparats aus Fig. 1,

Fig. 3

eine Wiedergabe eines segmentierten Schneidelements an der ersten Schneidvorrichtung, das im Verhältnis zu einem Schneidelement der zweiten Schneidvorrichtung aus Fig. 1 in Axialrichtung versetzt angeordnet ist,

Fig. 4

eine Wiedergabe der Bahn und einer daraus geschnittenen Signatur, die von dem Falzapparat aus Fig. 1 hergestellt wurde,

Fig. 5

einen Klemm- und Schneidvorgang einer Schneid- und Klemmvorrichtung des Falzapparats aus Fig. 1,

Fig. 6

Riemen, die die in Axialrichtung beabstandeten Nuten in dem Schneidzylinder der zweiten Schneid- und Klemmvorrichtung durchlaufen, und

Fig. 7

Riemen, die die in Axialrichtung beabstandeten Nuten in dem Nutenzylinder der zweiten Schneid- und Klemmvorrichtung durchlaufen.

In the drawings show:

Fig. 1

a side view of the folding apparatus of a web-fed rotary offset printing machine according to the invention,

Fig. 2

a detailed view of a cutting and clamping device of the folding apparatus of Fig. 1,

Fig. 3

a representation of a segmented cutting element on the first cutting device, which is offset in relation to a cutting element of the second cutting device of Figure 1 in the axial direction,

Fig. 4

a reproduction of the web and a signature cut therefrom, which was produced by the folding apparatus of Fig. 1,

Fig. 5

a clamping and cutting operation of a cutting and clamping device of the folding apparatus of Fig. 1,

Fig. 6

Belts that pass through the axially spaced grooves in the cutting cylinder of the second cutting and clamping device, and

Fig. 7

Belts passing through the axially spaced grooves in the grooved cylinder of the second cutting and clamping device.

Fig. 1 shows a folder 100 having a first cutting and clamping device 101 for partially cutting a web 1 to make the first cuts 44 in the web 1, as shown in Fig. 4. The first cutting and clamping device 101 comprises a first cutting cylinder 3 having a first segmented cutting knife 4. The first segmented cutting knife 4 has spaced knife edges for generating spaced cuts in the web 1, but which do not sever the entire width of the web. The first segmented cutting blade 4 cooperates with a grooved or anvil cylinder 2 of the first cutting device 101. During the cutting operation, the cutting cylinder 1 and the anvil cylinder 2 clamp the web 1 due to the elastic properties of the elastic material layer 14, 24 applied to the peripheral surfaces of the cylinders 2 and 3 in the area of the segmented cutting blade 4, which will be discussed in further detail below.

Fig. 5 shows a combined clamping and cutting operation of the cutting cylinder 3 and the anvil cylinder 2. The clamping elements or clamping surfaces 214 of the anvil cylinder 2 extending in the circumferential direction around the anvil cylinder 2 around and can for example by a continuous material layer 24, in particular urethane or other rubbery material, be formed. The clamping elements or clamping surfaces 203 of the first cutting cylinder 3 also extend in the circumferential direction relative to the cutting blade 4, which has the axially spaced cutting surfaces 45, as shown in Fig. 3. The cutting blade 4 thus forms first partial cuts 44 in the web 1, and the web 1 remains clamped between the clamping surfaces 202, 203 when it passes the first cutting and clamping device 101.

The web 1, after having been partially cut by the first cutter 101, is passed between the first guide belts or belts 5 and the second guide belts or belts 6. Each of the belts 5 and 6 comprises a plurality of mutually parallel belts which are spaced apart in the axial direction of the cutting cylinder 3 (i.e., on the side in Fig. 1). The movement of the first belt 5 is determined by the guide rollers 8, 9, 33, 34, 35. At least one of the guide rollers may be driven by a motor to drive the belts 5, although the belts may alternatively be driven by the clamping action of the second cutter 102. The rolls 8 and 9 may be draw rolls which guide the belts 5, the web 1 and the belts 6 through a nip with the respective guide rollers as belt 6. The belts 6 may comprise a similar guide roller assembly.

The web 1 is then guided by the belts 5, 6 to the second cutting and clamping device 102, which comprises a second cutting cylinder 10 and a second grooved or anvil cylinder 20. The cutting cylinder 10 has a segmented cutting blade 19 which cuts the web 1 between the first cuts 44 to obtain a continuous cut, and thus a complete signature 50, as shown in FIG. The belts 5, 6 are passed between the cutting surfaces 32 of the second segmented knife 19 as the web 1 passes between the outer surfaces of the cutting cylinder 10 and the grooved cylinder 20 (Figure 3). As shown in Fig. 6, the straps 6 are thereby preferably passed through the axially spaced grooves 115 in the cutting cylinder 10, so that they are not clamped. As the web 1 passes through the second cutting and clamping device, the web 1 is clamped by the clamping elements or clamping surfaces 114 of the second cutting cylinder 10 and the clamping elements or clamping surfaces 214 of the second anvil cylinder 20 (Figure 7). As shown in FIG. 7, the belts 5 can be passed through the grooves 215 in the anvil cylinder 20. The clamping elements 114 extend in the circumferential direction relative to the cutting surfaces 32 of the second cutting blade 19 (FIG. 3). The Clamping elements 214 preferably extend continuously around the circumference of the second anvil cylinder 20.

The linear position of the web in web direction and web cross direction is controlled by the slip-free boundary condition between the nip and the web. The clamping action of the second cutting and clamping device 102 allows for strong retention of the web 1 while the segmented knife 18, 19 intersects the web 1 between the first cuts 44 (Figure 4). The clamping operation according to the invention improves the cut-to-cut accuracy and the print-to-cut accuracy in a double-cut folder. Problems with stepped cuts, which usually arise in other double-cut devices, can thereby be avoided or at least reduced.

After the second cut, the signature 50 (Figure 4) is fed by the belts 5, 6 to a subsequent section in the folder.

Fig. 2 shows the second cutting cylinder 10 and the second anvil cylinder 20 in more detail. The second cutting cylinder 10 includes an axle 16 which may be in driving connection with an unillustrated motor to drive the cylinder 10. In the preferred embodiment of the invention, the axle 16 has a two-piece hub 12, which is preferably made of metal, and which, as shown, is preferably held together by means of screws or bolts. The segmented cutting blades 18 and 19 are inserted between the two parts of the hub 12 accurately and are preferably also secured by means of screws and bolts to the hub 12. However, it is also another attachment of the cutting blade 18, 19 conceivable on the hub.

To create a clamping force on the web 1 during the cutting operation, an outer layer 14 of urethane or other rubber-elastic material is disposed around the circumference of the hub 12. The layer 14 may either be applied to the semi-cylindrical hub portions prior to assembly of the hub 12, or after screwing the hub as a whole axially mounted on the cylinder 10, 20, and optionally z. B. by means of adhesive. The elastomeric outer layer 14 provides a continuous smooth surface that extends along the circumference of the cutting cylinder 10 from the cutting surfaces 32. The recessed or recessed portions 36 (FIG. 3) of the segmented cutting knife 19, which may cooperate with the grooves or recesses 115 in the layer 14 as shown in FIG. 6, may themselves lie directly against the surface of the cylinder 10 or coated with urethane or other material to reduce the wear of the second guide belt 6. The layer 14 can already be connected to the corresponding parts of the hub prior to assembly, for example by gluing. If the recessed or recessed portions 36 are not coated, they are preferably dull and intermesh or correspond with the bottom surfaces of the grooves or recesses 115 (FIG. 6), second anvil cylinder 20 and / or cutting cylinder 10 around the second guide belts 6 circulate in the grooves 115, not excessively wear or even damage them. Furthermore, it can be provided that the belts 5, 6 rotate at a different speed than the cylinders.

The grooved cylinder 20 includes an axle 26 that may be coupled to the drive motor via a transmission to drive the anvil cylinder 20 preferably at the same speed as the cutting cylinder 10. However, an independent drive motor is also possible.

A hub 22, which is preferably made of metal, may be rotatably connected to the axis 26, for example by bolts or screws. A layer of material 24 of urethane or other elastomeric material providing the desired clamping forces is preferably disposed on either side of the hub 22 and may be applied to, for example, adhesively bonded to the hub prior to assembly of the hub 22 or after assembly Hub 22 and the axis 26 by axially sliding an endless urethane sleeve with the hub 22nd get connected. It is also conceivable that the hub 22 is made of one piece.

The second grooved cylinder 20 and / or the second cutting cylinder 10 are preferably circumferentially indexable, such that new surface portions of urethane cooperating with the cutting blade 4, 19 are provided as soon as a portion of the surface or clamping surface 214 by the action the cutting blade 18, 19 is worn. In order to enable a stepwise movement of the cylinder, this can be rotated for example via a so-called harmonic drive (harmonic drive), which can also be done during operation of the folder.

The distance from the center of the cutting cylinder 10 to the center of the grooved cylinder 20 is preferably adjustable to adjust the clamping function, e.g. to process webs of different thicknesses. A simple mechanical, pneumatic or hydraulic device may be provided to make this adjustment, preferably with a force applied automatic adjustment.

The cutting cylinder 10 and the grooved cylinder 20 are preferably cantilevered, allowing easy replacement of the belts on the non-cantilevered side. A releasable bearing may be provided to support the second end.

The first cutting cylinder 3 and the first anvil cylinder 2 may be similar in construction to the second cutting cylinder 10 and the second anvil cylinder 20, with the difference that the clamping surfaces of the cutting cylinder 3 and the anvil cylinder 2 preferably do not carry belts and therefore have a continuous axial direction, have non-stepped surface.

As shown in Fig. 3, the axial positions of the cutting surfaces of the cutting blades 4 and 19 of the first and second cutting cylinders 3 and 10 are different. The blades 4 of the first cutting cylinder 3 have cutting edges 45 which engage the first cuts 44 in Figs bring in the material web 1 and thus partially cut it (FIG. 4). The segmented cutting blades 18 and 19 of the second cutting cylinder 10 have the cutting surfaces 32, which preferably overlap axially by a distance d with the cutting surfaces 45 of the first cutting cylinder 3, as indicated in Fig. 3.

The second guide belt 6 moves within the recessed or recessed area 36 between the cutting surfaces 32 of the segmented cutting blades 18, 19 of the second cutting cylinder 10.

By providing the cutting and clamping surfaces on the same cutting cylinder, a more accurate cut can be made possible. The web can be held at any time, so that a more accurate signature and editing can be ensured. The urethane coating is particularly preferred to enable the clamping function of the present device.

Each of the first cuts has a certain length determined by the width of the cutting surfaces 45 (Figure 3).

The first and / or the second cutting cylinder 3, 10 may have a multiplicity of segmented cutting blades 18, 19, for example 2, 3 or 4 cutting blades, which are each arranged offset by 180, 120 or 90 degrees.

By the term "clamping elements" or clamping surfaces are meant the portions of the first and second cutting cylinders 3, 10, respectively, which extend around the circumference of the cylinder from cutting blade to cutting blade. The clamping elements 114, 203 form with the associated clamping elements or clamping surfaces 202 of the first anvil cylinder 2, and the clamping surfaces or clamping elements 214 of the second anvil cylinder 20 a nip in which the material web 1, or the signature for positionally precise, register-oriented guidance is clamped during the respective cutting process.

Finally, the attachment of the elastic rubber-like clamping elements 114, 214, 203, 202 on the first and second cutting cylinders, and the first and second anvil cylinders can also be effected by adhesive tape, preferably double-sided adhesive tape.

List of reference numbers

1

train

2

grooved cylinder

3

cutting cylinder

4

segmented cutting blade

5

first guide belt

6

second guide belt

8th

guide roller

9

guide roller

10

second cutting cylinder

12

two-piece hub

14

elastic outer layer

16

axis

18

knife

19

knife

20

second grooved cylinder

22

hub

24

layer

26

axis

32

cutting surface

33

guide roller

34

guide roller

35

guide roller

36

recessed or recessed areas

44

first cuts

45

cutting surfaces

49

whole cut

50

signature

100

folding

101

first cutting and clamping device

102

second cutting u. clamping device

114

Clamping elements or clamping surfaces of the second cutting cylinder

115

groove

202

Clamping surfaces of the first cutting cylinder

203

Clamping surfaces of the first anvil cylinder

214

Clamping elements or clamping surfaces of the second anvil cylinder

215

groove

Claims (14)

1. Folding device in a web-fed printing press, with a first cutting and clamping device (101) for the introduction of first cuts (44) in a moving material web (1), and with a second cutting and clamping device (102) for the introduction of further cuts in the material web (1) completing the first cuts (44) to form a continuous cut (49) in such a manner that a signature (50) with smooth cut edges is produced,
   characterised in that
   the second cutting and clamping device (102) comprises a second cutting cylinder (10) with second cutting elements (18, 19), which cooperates with an anvil cylinder (20), which is provided with a covering (14) made of resilient material extending around the circumference of the cylinder, which clamps and guides the material web (1) in a gap formed between the second anvil cylinder (20) and the second cutting cylinder (10) during the introduction of the second cuts.
2. Device according to claim 1,
   characterised in that,
   the second cutting element (18, 19) is designed as a segmented cutting blade with cutting faces (32) spaced at a distance in the axial direction with cut-out regions (36) arranged between them.
3. Device according to claim 2,
   characterised in that
   guide belts (6) for transporting the signatures (50) are arranged in the cut-out regions (36) of the segmented cutting blade (18, 19).
4. Device according to claim 3,
   characterised in that
   grooves (215) are formed in the circumferential surface (24) of the second anvil cylinder (20) assigned to the second cutting cylinder (10), through which grooves further guide belts (5) cooperating with the guide belts (6) are arranged for the guidance of the signatures (50) after the material web (1) has been completely cut through.
5. Device according to any one of the preceding claims,
   characterised in that
   the covering made of resilient material (14) of the second cutting cylinder (10) is made of or contains urethane.
6. Device according to any one of the preceding claims,
   characterised in that
   the second cutting cylinder (10) comprises a two-part hub (22), to which the covering (14) of resilient material is attached.
7. Device according to claim 6,
   characterised in that
   the resilient covering (14) is glued to the outer surface of the hub (22).
8. Device according to any one of the preceding claims,
   characterised in that
   the covering (14) of resilient material projects beyond the cutting element (18, 19) in the radial direction.
9. Device according to any one of the preceding claims,
   characterised in that
   the second anvil cylinder (20) is also provided with a covering (214) of resilient material, especially urethane.
10. Device according to any one of the preceding claims,
    characterised in that
    the second anvil cylinder (20) provides a two-part hub, to which the resilient covering (214) is attached.
11. Device according to any one of the preceding claims,
    characterised in that
    the first cutting element (4) of the first cutting and clamping device (101) is also formed by a segmented cutting blade with cutting faces (45) arranged at a distance from one another, wherein the first and the second segmented cutting blades (4, 19) are arranged with an axial offset relative to one another in such a manner that the first cuts (44) and second cuts (49) cuts are introduced into.the material web (1) with an overlap (d).
12. Device according to any one of the preceding claims,
    characterised in that
    the second cutting cylinder (10) can be indexed with reference to the second anvil cylinder (20).
13. Device according to any one of the preceding claims,
    characterised in that
    the second cutting cylinder (10) bears at least two cutting elements (18, 19).
14. Device according to any one of claims 2 to 13,
    characterised in that
    the covering (14) of resilient material extends through the cut-out regions (36).

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