DE102006019029B4 - Processing machine for sheet material - Google Patents

Abstract

Processing machine for sheet material, in particular a rotary printing machine or a varnishing machine designed as a sheet guiding cylinder pressure cylinders (1) and transfer cylinders (4), each pressure cylinder (1) on the periphery sheet holding means and each transfer cylinder (4) at least one coupled to a vacuum source suction bar (6) for fixing an arc edge, wherein each transfer cylinder (4) has a drivable shaft (5) and on the shaft (5) at least two substantially cylindrical discs (7) are arranged with circumferentially arranged means for supporting one side edge of the sheet material, characterized in that the means for restraining each of a side edge of the sheet material are arranged and circumferentially spaced at intervals, coupled to a vacuum source and can be acted upon with negative pressure openings (11) or circumferentially spaced at intervals, ge an annularly over an enveloping circle (18) of the discs (7) projecting into the sheet material penetrating support elements (17).

Description

The invention relates to a processing machine for sheet material, in particular a rotary printing press or a varnishing machine, according to the preamble of patent claim 1.

A processing machine of this kind is out EP 0 769 376 A1 as a sheet-fed printing press with printing cylinders with virtually closed surface, ie without cylinder channel known. The printing cylinder have circumferentially two arranged pressure segments for the sheet support and per pressure segment an axially parallel arranged, coupled to a vacuum source suction for the purpose of fixing the sheet leading edge. To realize the sheet transport act with the printing cylinders of the same size transfer cylinder for the purpose of sheet transfer or sheet transfer together. Each transfer cylinder has per print segment of the printing cylinder, a combination of coupled to a vacuum source, compliant suction pads and Tauchgreiferanordnungen. Since the respective adjacent pressure cylinder has no cylinder channel, the execution with ab- or emerging grippers to avoid collisions is necessary. Each submersible gripper arrangement is controlled via two cam gears each for opening and closing the gripper and for the removal or emergence of the gripper.

In one embodiment, two transfer cylinders cooperating with a printing cylinder can only be designed with two compliant, axially parallel suction strips (without mechanical grippers).

A disadvantage of these embodiments is that in the transfer cylinders with Saugleisten and dip grippers, the formation of the cam-controlled Tauchgreiferanordnungen is relatively expensive.

It is also disadvantageous that in the case of transfer cylinders with suction strips arranged exclusively thereon, no means for supporting the sheet guide or for taking into consideration the format width of the sheet material are disclosed.

Out DE 196 29 370 A1 is a rotary printing machine is known, in which a device for surface treatment is arranged downstream in the conveying direction of the sheet material after the last printing unit. This device comprises a combination of so-called rotary conveyors and transfer drums, which are arranged in the arched area of the delivery area. The rotary conveyors and transfer drums have per se known grippers for the purpose of detecting a sheet edge. Each rotary conveyor is assigned a sheet guiding device outside its enveloping circle. Within the rotary conveyor drying devices can be arranged. Outside the transfer drums these dryer devices and a powder device can be assigned.

The invention is based on the object to provide a processing machine of the type mentioned in the bowing cylinders of the sheet transport is improved taking into account the sheet guide and the format width.

The object is achieved by the training features of claim 1. Further developments emerge from the dependent claims.

A first advantage of the invention is that, in particular, the sheet guiding cylinders designed as transfer cylinders improve the bowing in the processing machine. For this purpose, outside the enveloping circle of the transfer cylinder, no sheet guiding devices-known per se in the case of sheet-fed rotary printing or sheet-fed rotary varnishing machines-are necessary. According to the invention, each sheet is at a sheet edge, for example, the sheet leading edge, by means of vacuum (suction) and in the circumferential direction at its two side edges (ie not printed with a / Lacksujet / painted edge zones of the sheet material) with means for each detection of a side edge of the sheet material forced out. Preferably, the positive guidance by means of negative pressure (suction air) takes place on the circumference of the respective transfer cylinder. Each sheet is thus at a sheet edge transversely (i.e., axially parallel to the axis of the sheet guiding cylinder) by means of vacuum (suction) and in the circumferential direction at both side edges during the rotation of the transfer cylinder partially or completely preferably by suction (vacuum) fixed. For the sheet guide, the transfer cylinders can preferably be functionally connected to printing cylinders, which have analogous to the transfer cylinders on the circumference transverse (in the axial direction) arranged suction or mechanical gripper systems as sheet holding means. Alternatively, each sheet at a sheet edge by means of vacuum (suction) and in the circumferential direction at its two side edges instead of suction with support elements, preferably needles, tips, puncturing, etc., fixed to the respective transfer cylinder and thus positively guided. The support elements are formed protruding slightly for the purpose of positive guidance over the enveloping circle.

A second advantage results from the fact that the transfer cylinder by means preferably slidable in Zylinderachsrichtung, substantially cylindrical discs, in particular with a vacuum source coupled suction discs (with suction openings) or discs with circumferentially arranged, already mentioned above support elements, such as needles, tips, puncturing, etc., can be adapted to the respective format width of the sheet material. If necessary, for example, in rum format widths of sheet material, several of these discs can be arranged on the cylinder axis. In addition to the two disks on the side edges of the sheet material, at least one additional such disk, for example in the middle format range, support the sheet material. Alternatively, these discs are adjustable to pressure-free zones of the sheet material.

A third advantage is due to the fact that the respective sheet material does not have to be transported symmetrically through the processing machine in the conveying direction by the discs which can be adjusted in the axial direction (with suction openings arranged at the circumference or with supporting elements). Rather, depending on the previous orientation of the sheet material in the contact area in the conveying direction (after the A- or B-side frame side of the machine) - printed or painted offset to the center.

The fourth advantage is that this training of transfer cylinders for the sheet transport of one or both sides printed / lacquered sheet (beautiful and perfecting) can be used. Between the printing cylinders of the printing / coating units as well as in the boom such transfer cylinders can be arranged one behind the other or several times in the conveying direction of the sheet material. The pressure cylinders are formed with at least one suction, in double-sized cylinders with two diametrically offset by 180 ° suction, for the purpose of fixing the sheet material to the sheet edge. The training is not limited to single or double-sized transfer cylinder. Alternatively, triple or quadruple-size transfer cylinders with circumferentially offset by 120 ° or 90 ° multiple arranged Saugleisten be realized. Alternatively, the printing cylinders (single or multiple size) may be formed with mechanical grippers and the suction bars on the transfer cylinder are recessed in accordance with the gripper pitch.

A fifth advantage results from the fact that the boom area is formed by a plurality of bow guide cylinders, in particular transfer cylinders. At least one transfer cylinder may be associated with at least one dryer device of any type, including a combined type, for example UV dryers, IR dryers, hot air dryers, etc. Furthermore, at least one transfer cylinder can be assigned a powder device. Advantageously, the printing / Lacksujet of the sheet material or the sheet material itself dried or cured on one or both sides. When arranging at least one powder device within the transfer cylinder with discs or at a defined distance outside the transfer cylinder no disturbing gripper system on the transfer cylinder is present, so that the sheet over the entire surface (one or both sides) can be powdered. The condition caused by conventional gripper bridges, with "shadow" of the gripper bridge afflicted powdering of the sheet material is thus obsolete.

A further advantage is to be stated that the sheet material is no longer exposed to the physical and fluidic resistances due to the circumferential positive guidance on the panes, at least in the side edge region of the sheet material. The previous "fluttering" of the bow in the trailing edge area is thus obsolete.

Another advantage to be mentioned is that lubrication which is necessary with conventional sheet-holding means, in particular gripper systems, or chains, chain guides, curves, rolls, etc., is no longer necessary on the suction strips or disks. Thus, a possible lubricant contact with the substrate can be avoided, which otherwise leads to contamination of the then diminished in value or worthless sheet material. Special advantages brings this way of sheet guiding in packaging printing, for example, for food, luxury foods, medicines, etc., or in very high quality print products, such as security and securities printing.

It is improved with the execution of the invention, the sterile processing of the sheet material in operations that handle, for example, foods, luxury foods or medicines. If necessary, the powdering device can be dispensed with in the processing machine so that the printing process can be realized dust-free. The invention also represents a contribution to the "clean" printing house.

In order to record the printing / coating quality, an inspection device, in particular a camera for quality detection, can be assigned without contact to the sheet guided forcibly on a transfer cylinder with disks. Such a camera can be arranged within the enveloping circle and / or outside of the enveloping circle of a transfer cylinder at a defined distance.

The invention will be explained in more detail using an exemplary embodiment. Here are shown schematically:

1 a sheet-fed rotary printing machine with printing / coating unit and sheet guiding cylinders,

2 a sheet guiding cylinder in the form of a transfer cylinder with disks,

3 a disc with circumferentially arranged suction openings (side view),

4 a disc with circumferentially arranged support elements (side view),

A sheet-fed rotary printing press has at least one printing unit 1 and in the conveying direction 16 arranged downstream of the sheet material at least one coating unit II ( 1 ). The printing works 1 For example, are offset printing and have a single-sized plate cylinder 3 and a single-sized blanket cylinder 2 on, which with a pressure cylinder 1 trained sheet guiding cylinder in functional connection can be brought on. The plate cylinder 3 is an inking unit (not shown) and associated with a dampening system as needed. The printing cylinder 1 is - based on a single-sized plate / blanket cylinder 3 . 2 - Double-sized and thus has two circumferentially offset by 180 °, diametrically opposed suction bars 6 as a sheet holding means for fixing the sheet material to a sheet edge by means of negative pressure. The suction bars 6 are axially parallel to the impression cylinder 1 arranged and are for example by means of a pressure cylinder 1 provided rotary feedthrough coupled to a suction air source.

The printing unit I follows in the conveying direction 16 as a sheet guiding cylinder a transfer cylinder 4 , which is also double-sized and analogous to the impression cylinder 1 two circumferentially offset by 180 °, arranged diametrically opposite suction strips 6 for fixing the sheet material to a sheet edge by means of negative pressure. The suction bars 6 are axially parallel to the transfer cylinder 4 arranged and are for example by means of a transfer cylinder 1 provided rotary feedthrough with a suction air source (vacuum source) coupled. If necessary, a common suction air vacuum source for the pressure and transfer cylinder 1 . 4 be provided.

The transfer cylinder 4 is in the conveying direction 16 downstream of the coating unit II. The coating unit II has a form cylinder 3 on which a metering system, for example, a chambered doctor blade with rastered applicator roll or a two- or three-roll mill, upstream. The form cylinder 3 is with one as a printing cylinder 1 trained sheet guiding cylinder in functional connection can be brought. The printing cylinder 1 is - based on a simple-sized form cylinder 3 - Double-sized and thus has two circumferentially offset by 180 °, diametrically opposed suction bars 6 for fixing the sheet material to a sheet edge. The suction bars 6 are axially parallel to the impression cylinder 1 arranged and are for example by means of a pressure cylinder 1 provided rotary feedthrough coupled to a Saugluft- / vacuum source. The coating unit II may alternatively be designed as a flexographic printing unit.

The coating unit II follows in the conveying direction 16 a boom III, which may be formed in many ways. In the present example, the impression cylinder 1 of the coating unit II a plurality of transfer cylinders 4 in the conveying direction 16 downstream. In this case, at least one transfer cylinder 4 within and / or outside its envelope 18 at least one dryer device 12 be assigned. If necessary, at least one powdering device 13 within and / or outside the outer circle 18 at a defined distance to the transfer cylinder 4 be arranged. The powdering devices are preferred 13 above a transfer cylinder 4 arranged like this in 1 is shown.

In the conveying direction 16 last transfer cylinder 4 follows a conveyor 15 , For example, such a conveyor 15 a belt conveyor, the sheet material on a postponed delivery pile 14 stores. Alternatively, the sheet material by means of conveyor 15 directly to a subsequent further processing station, such as a punching machine, are supplied.

Each of the transfer cylinders 4 has a drivable, arranged in bearings in each side frame shaft 5 on ( 2 ). On the wave 5 are preferably two supports 9 arranged at a distance to each other, which at the free ends depending one with the suction air source (vacuum source) coupled suction strip 6 wear. Alternatively, the suction bars 6 otherwise on the circumference, for example, the following discs 7 to be fixed. Each squeegee coupled to a vacuum source 6 has openings for sucking and fixing the sheet material to a sheet edge, preferably for detecting the sheet leading edge on. In 2 the arrows show the suction direction 10 at the top of the squeegee 6 , which is shown in the intake function. In contrast, the bottom suction is 6 inactive.

Continue to wear the shaft 5 gem. 2 at least two substantially cylindrical discs 7 with circumferentially arranged means 11 . 17 for the purpose of detecting one side edge of the sheet material.

In a first training are the means 11 mutually spaced openings 11 , The openings 11 in the slices 7 are with a suction air source (vacuum source) of the transfer cylinder 4 coupled. On the circumference carries each disc 7 a plurality of these spaced apart openings 11 to the respective side edge of the sheet material by means of suction (negative pressure) in addition to the squeegee 6 , which detects the sheet edge to fix. Thus, each sheet is at a sheet edge by means of a squeegee 6 and at least partially or completely fixed at least at the two side edges by means of negative pressure (depending on the position in the conveying direction 16 ).

The disks 7 are preferred in the axial direction of the shaft 5 , especially in the direction of displacement 8th , adjustable to the format width of the sheet material. The adjustment can be done by motor or manually. The disks are preferred for this purpose 7 at the circumference recesses 19 for receiving the suction bars 6 on.

The supply of the suction bars is preferred 6 and / or the discs 7 realized with suction (negative pressure) by means of a valve control. Preferably, the valve control is circuit-coupled with a machine control.

The drive of the transfer cylinder 4 can by means of the main drive and a closed gear train or self-powered by means of one at the shaft 5 arranged single drive done.

The effect is as follows: A bow is in the conveying direction 16 a printing unit I, especially its impression cylinder 1 , fed. The bow is at the sheet leading edge by means of a squeegee 6 alternatively by means of grippers, fixed by the pressure zone formed by the blanket cylinder 2 and the impression cylinder 1 led and to the orderly transfer cylinder 4 to hand over. In the transfer area, the transfer cylinder takes over 4 the bow by means of a valve control activated squeegee 6 , For printing cylinders 1 with grippers is every squeegee 6 of the transfer cylinder 4 executed according to the gripping pitch with recesses. Next to the squeegee 6 be the slices 7 In the circumferential direction with suction (negative pressure) applied, so that the arc on both side edges circumferentially on the discs 7 rests and fixed by suction (negative pressure) is guided. Here are the squeegee 6 and / or the discs 7 preferably angular correlated with suction acted upon. In 3 is this situation (without a bow) on a transfer cylinder 4 shown. In the example in 3 shown transfer cylinder 4 is always just a squeegee 6 , here's the bottom squeegee 6 and the following in the direction of rotation (arrow) openings 11 the discs 7 activated with negative pressure.

At the next handover, the bow is followed by a squeegee 6 , alternatively of grippers, of the printing cylinder 1 taken over by the coating unit II, by the form cylinder 3 and impression cylinder 1 led paint gap formed and then to another transfer cylinder 4 , especially its activated squeegee 6 to hand over. After the transfer, the bow lays on the suction air (suction direction 10 ) acted openings 11 the discs 7 on and is fixed to the next, identical transfer cylinder 4 to hand over. This transfer cylinder 4 is at a defined distance outside the enveloping circle a dryer device 12 assigned for drying or curing of the printing ink or the paint. At the following identical transfer cylinder 4 is in addition to the wave 5 (lying inside) at least one, preferably two drying devices 12 between the two suction bars 6 arranged. At the following transfer cylinder 4 is a combination of internal drying equipment 12 and externally arranged drying devices 12 shown. Following this is in the conveying direction 16 at least one powder device 13 at a defined distance to the transfer cylinder 4 arranged. If necessary, at least one powdering device 13 on the wave 5 , ie lying inside, be arranged.

If necessary, at least one additional disc 7 with support elements 17 between the two discs 7 for detecting the respective side edge of the sheet material on the shaft 5 be arranged. Preferably, the at least one disc 7 paraxial in the direction of displacement 8th adjustable by motor or manually.

In a second embodiment, each transfer cylinder 4 the same, already described basic construction. Only the discs 7 indicate the circumference - instead of the openings 11 for Saugluftbetrieb - spaced apart support elements 17 on. The support elements 17 are preferably needles, tips, spikes, puncture, etc. and are on the discs 7 circumferentially at intervals to each other fixed or with respect to the shaft 5 arranged movable in the radial direction. The support elements 17 are slightly above the outer circle 18 of the transfer cylinder 4 out. In 4 For reasons of clarity, they are only a suction bar activated with negative pressure 6 , here the lower, activated squeegee 6 , as well as in the direction of rotation (arrow) subsequent support elements 17 on the circumference of the discs 7 shown.

The support elements 17 are for example two adjacent transfer cylinders 4 of the same design fixedly arranged and have staggered distances, the pitch of the respective adjacent transfer cylinder 4 consider. In one with at least one impression cylinder 1 cooperating transfer cylinder 4 are the ones on the circumference of the discs 7 arranged support elements 17 , For example by means of spring force, radially movable. Upon contact with the pressure cylinder jacket surface, in particular in the transfer area, the support elements dip 17 in the disk 7 one and after passing through the contact zone, the support elements are moved by spring force to the original position and there, for example by means of a stop, positioned. Analogous to the discs 7 with openings 11 for Saugluftbetrieb serve the support elements 17 the fixation of the two side edge regions of the sheet material.

The disks 7 with support elements 17 are also in the direction of displacement 8th adjustable. Furthermore, at least one additional disc 7 with support elements 17 between the discs 7 with support elements 17 for the margin area on the shaft 5 in the direction of displacement 8th be movably arranged. The support elements 17 can penetrate positively into the sheet material. The use of slices 7 with support elements 17 is preferred for thick or relatively rigid substrates useful. The arrangements of drying equipment 12 and / or powdering facilities 13 are analogous to the first training already described feasible.

LIST OF REFERENCE NUMBERS

1

pressure cylinder

2

Blanket cylinder

3

Plate / form cylinder

4

transfer cylinder

5

Shaft (transfer cylinder)

6

squeegee

7

disc

8th

displacement direction

9

support

10

suction

11

openings

12

drying device

13

powdering device

14

delivery pile

15

Conveyor

16

Conveying direction (of the sheet material)

17

support element

18

enveloping circle

19

recess

I

printing unit

II

coating unit

III

boom

Claims (10)

Processing machine for sheet material, in particular a rotary printing press or a varnishing machine designed as a sheet guiding cylinder pressure cylinders ( 1 ) and transfer cylinders ( 4 ), each pressure cylinder ( 1 ) perimeter sheet holding means and each transfer cylinder ( 4 ) at least one suction bar coupled to a vacuum source ( 6 ) for fixing a sheet edge, each transfer cylinder ( 4 ) a drivable shaft ( 5 ) and on the shaft ( 5 ) at least two substantially cylindrical discs ( 7 ) are arranged with circumferentially arranged means for supporting each of a side edge of the sheet material, characterized in that the means for restraining each of a side edge of the sheet material are arranged and mutually circumferentially spaced at intervals, coupled to a vacuum source and acted upon with negative pressure openings ( 11 ) or are arranged at intervals in the circumferential direction, slightly beyond an enveloping circle ( 18 ) of the discs ( 7 ) protruding into the sheet material penetrating support elements ( 17 ) are. Processing machine according to claim 1, characterized in that the discs ( 7 ) on the shaft ( 5 ) parallel to the axis in displacement device ( 8th ) are adjustable. Processing machine according to claim 1, characterized in that the discs ( 7 ) at least one recess ( 19 ) for receiving at least one squeegee ( 6 ) having. Processing machine according to claim 1, characterized in that on the shaft ( 5 ) at least one circumferentially arranged suction strip ( 6 ) is fixed for the purpose of detecting the sheet edge. Processing machine according to claim 1 and 4, characterized in that the at least one suction strip ( 6 ) by means of supports ( 9 ) on the shaft ( 5 ) is fixed. Processing machine according to claim 1, characterized in that on the shaft ( 5 ) at least one drying device ( 12 ) within the envelope circle ( 18 ) of the transfer cylinder ( 4 ) is arranged. Processing machine according to claim 1, characterized in that the transfer cylinder ( 4 ) outside the outer circle ( 18 ) at a defined distance a drying device ( 12 ) is assigned adjacent. Processing machine according to claim 1, characterized in that the transfer cylinder ( 4 ) outside the outer circle ( 18 ) at a defined distance a powder device ( 13 ) is assigned adjacent. Processing machine according to claim 1, characterized in that between the two discs ( 7 ) on the shaft ( 3 ) at least one further disc ( 7 ) is arranged. Processing machine according to claim 1 and 9, characterized in that the at least a disk ( 7 ) on the shaft ( 3 ) parallel to the axis in the direction of displacement ( 8th ) is adjustable.

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