EP1038672A2 - Device for tensioning of printing plates in lock-up gaps having a reduced size - Google Patents

Abstract

The invention relates to a device for holding a printing form (16) on the circumference of a printing form cylinder (20), the front edge (17) of the printing form (16) overlapping and extending over a clamping channel (19) extending along the circumferential surface of the cylinder (20) the rear edge (18) of the flexible printing form (16) can be fixed by at least one resilient holding element (2) attached to a tensioning shaft (1). The individual resilient holding elements (2) are arranged side by side. Individually mounted spring elements (2) are fastened to the tensioning shaft (1), which engage the rear edge (18) of a printing form (16) with play (T) when the tensioning shaft (1) is actuated by means of an adjusting unit (11).

Description

EP 0 639 454 B1 describes a device with a retractable hook for Holding a printing plate on a support cylinder in a rotary printing press and a rotary printing press with such a device is known become.

The device for holding a printing plate on a support cylinder on a Rotary printing machine is located on a support cylinder with an outer to the axis of rotation of the support cylinder cylindrical peripheral surface and at least an inner longitudinal bore which is in the outer peripheral surface by means of a Longitudinal slot opens. There are means of restraint in the longitudinal bore, in particular a rear end part of the pressure plate in the slot, which in rest with respect to the support cylinder with a front edge with respect to one given direction of rotation of the support cylinder about its axis of rotation, provided by the plate in the wound state on the outer Circumferential surface of the support cylinder is stretched. There are also hook-forming agents with at least one radially outer and to the axis of rotation of the support cylinder hooks pointing against the direction of rotation. Furthermore, means for Actuate the hook-forming means provided, which at least partially in the Bore of the support cylinder are arranged and are suitable for the hook in to move back and forth in a controlled manner. Between one in relation to the Direction of rotation of the support cylinder front end position to enable the Hooking or unhooking the rear end fold on the hook and one in with respect to the direction of rotation of the support cylinder rear end position in order to rear gusset hooked on the hook pulling force against the direction of rotation of the Exercise cylinder, the hook then into the interior of the slot is withdrawn with respect to the outer peripheral surface of the support cylinder. The hook-forming means are also embedded in the slot and the hook is standing in the front end position over the outer peripheral surface of the support cylinder about. The actuating means are suitable during the movement of the front end position to the rear end position the withdrawal of the hook in the slot and during the movement from the rear end position to the forward end position the protrusion of the hook with respect to the outer To cause peripheral surface of the support cylinder. The hook-forming means comprise at least one longitudinal blade having a first with respect to the Axis of rotation of the support cylinder has a radially inner end region, with a Tension rod is firmly connected inside the bore and a second longitudinal end portion, which is with respect to the axis of rotation of the support cylinder is located radially outside and which forms the hook, and the sheet between its first end region and its second end region elastically deformed.

EP 0 678 383 A1 discloses a device for changing printing forms Rotary printing machines known. Both ends of a printing form are in the channel of a printing form cylinder, the surface of the printing form is wound around the printing form cylinder. According to this solution, one is a printing form A currently located on the printing form cylinder Device provided which is located on the printing form cylinder Printing form A takes up after this from the clamping devices of the Printing form cylinder is released and a device for feeding a new printing form B, which a new printing form to be applied to the Printing form cylinder transported. The device disclosed here draws is characterized in that at a short distance from the lateral surface of the Printing form cylinder horizontally movable holding elements of a leading edge Fix the printing form to be fed until remotely adjustable swiveling Holding means the front edge of the printing form B to be fed to the outer surface of the printing form cylinder.

EP 0 734 859 A1 relates to a device for changing Printing forms. A swiveling printing form loading unit comprises both Printing form feeder as well as a printing form removal compartment. The Printing form loading unit is both in a working position on the channel one Printing form cylinder with clamping devices as well as in a loading position swiveling, in which the printing form loading unit from the working position withdrawn. The one that swivels into a vertical loading position Printing form loading unit can be pivoted onto a holding element, on which a Inlet area for a printing form and the printing form cylinder Conveyors for a to be applied to the printing form cylinder Printing form are provided.

EP 0 741 021 A1 discloses a device for connecting holding elements with a traverse of a printing form cylinder. The device allows that Fixing a flexible printing form on the circumference of the printing form cylinder a rotary printing press, the leading edge of the flexible printing form engages over a front edge of a channel of the printing form cylinder and the Trailing edge of the flexible printing form by at least one on the crossbar Actuatable, resilient holding element can be fixed, which on the the periphery facing end has and is a hook-shaped projection characterized in that several holding elements can be arranged side by side can be positively locked to the crossbar with locking devices. The Holding elements can be inserted vertically in guides on the crossbar.

The device can be used in the assembly of printing forms without Tool.

Based on the outlined prior art, the object of the invention based on the mounting of a finite pressure plate on one Printing form cylinder by hand or by means of automatic To facilitate or improve printing form feed devices.

According to the invention this object is achieved in that in one device for holding a printing form resiliently on the circumference of a printing form cylinder Mounted holding elements are provided, which are individually on a tension shaft are stored, the rear edge of a printing form when the tensioning shaft is actuated reach behind with play.

The advantages associated with this solution allow both printing forms manually as well as by means of automatic printing form feed devices essential easier to wind up because of the play between spring elements that the Reach in under the printing form trailing edge during the mounting process of the printing form Relative movements of the printing form to the surface of the cylinder allows before the Clamping device is actuated and the printing form is clamped. By means of the provided game can inaccuracies in the printing form simply compensate without having to produce a new printing form, for example should be, the edges should not be angled exactly.

In a further embodiment of the idea on which the invention is based, the spring elements by means of individual support pins, one of each one Spring element is assigned, supported in the channel of the tension shaft. This solution allows the use of printing forms, the rear edge of which is not manufactured exactly was because the individual spring elements are irregularities on the Can adapt the printing form trailing edge more easily than, for example spring elements extending across the entire width. By the The ends of the spring elements protrude beyond the surface of the tension shaft can be given a high elasticity to the spring elements; this will still supported by the fact that the spring elements in an in the axial direction Printing cylinder extending recess in the area of the clamping channel immerse and thus the rear edge of the printing form to be drawn over a reach under the larger area from the bottom, so that this on the The circumference of the printing form cylinder remains relatively movable without the clamping area to leave the spring element.

When actuating an actuating unit that rotates the tensioning shaft and that on the Front of the cylinder can be provided, the rear edge of the Printing form in the direction of a nose on the front edge of the clamping channel of the Printing forme cylinder moves. This reduces the pressure-free space considerably, the plate is optimal on the surface of the printing form cylinder Fixed position.

The actuating movement of the actuating unit, for example as a pneumatic one Rapid cylinder with quick exhaust is formed using an adjusting lever transferred to the expansion shaft approach. The tension lever is from a bracket enclosed; the bracket can also serve to adjust the movement of the Limit the tension lever.

The tension shaft on which the individual spring elements are mounted is in three Storage points, designed as annular surfaces, in Printing form cylinder mounted, on both faces of the cylinder and in the center, see above that smooth operation of the tension shaft is guaranteed. Via side Openings, on the cylinder, the tension shaft can be completely removed from the Printing form cylinders are pulled out to the side.

The device of the invention can be particularly advantageous in Use printing form cylinders of rotary printing machines, be it sheet or Web-fed rotary printing machines. The low remaining non-printing The area around the tensioning channel saves the printers considerable paper costs.

The invention is explained in more detail below with reference to a drawing:

Fig. 1

die Längserstreckung einer in perspektivischer Darstellung gezeigten Spannwelle mit drei Lagerungsstegen,

Fig. 2

eine Explosionszeichnung der Spannwelle in perspektivischer Darstellung,

Fig. 3

ein Querschnitt durch die Spannwelle,

Fig. 4

die perspektivische Seitenansicht einer Zylinderstirnfläche,

Fig. 5

die Draufsicht auf eine Zylinderstirnfläche mit drei Querschnittsdarstellungen längs der Spannwelle,

Fig. 6

ein Detail der den Spannkanal begrenzenden Flächen, und

Fig. 7

die in den Spannkanal eingehängten Vorder- und Hinterkante einer Druckform.

It shows:

Fig. 1

the longitudinal extension of a tension shaft shown in perspective with three bearing webs,

Fig. 2

an exploded view of the tension shaft in perspective,

Fig. 3

a cross section through the tension shaft,

Fig. 4

the perspective side view of a cylinder face,

Fig. 5

the top view of a cylindrical end face with three cross-sectional views along the tension shaft,

Fig. 6

a detail of the surfaces delimiting the tension channel, and

Fig. 7

the leading and trailing edge of a printing form suspended in the clamping channel.

1, the longitudinal extent is in perspective View reproduced tension shaft with three bearing webs A, B, C reproduced.

On the tension shaft 1, two outer bearing webs A, B are provided and one middle bearing web C. The middle bearing web C divides the tension shaft 1 into two sections, the two sections being of equal length. The tension shaft 1 is traversed along the axial extent by a recess in which individual spring elements 2 mounted next to one another on the tensioning shaft 1 are provided. These spring elements 2 are in the for clarity perspective view of FIG. 1 omitted.

Fig. 2 shows an exploded view of the tension shaft in perspective Presentation.

The tension shaft 1 comprises a recess extending in the axial direction, not shown here, in which individual spring elements 2 are embedded. The Spring elements 2 comprise both longitudinal slots D and themselves extending slots with which the spring elements 2 by means of stiff, in the Recess attached support pins 3 in the recess of the Printing form cylinder can be locked. For this purpose, the spring elements 2 are on the support pins 3 fastened with screws 5, which with a collar 6th are provided. In the illustrated embodiment of the tension shaft 1 there are eight Spring elements 2 arranged side by side in the channel 19 of the Printing form cylinder 20 let in, which support the spring elements 2 Support pins 3 are received by the axially extending recess.

The tensioning shaft 1 is provided on its end faces A, B with tensioning lugs 8, also referred to as torsion bars, provided in the illustrated Embodiment are designed as a clamping lug with a square profile. Triangular profiles or multi-wedge profiles that form a positive connection with an attachable clamping tool or a pneumatic or hydraulic one enable actuatable clamping tool are also conceivable. The one in Fig. 2 Positioning bar A is shown with an opening provided Bearing shield 7 enclosed, which on a recess of the end face of the Printing form cylinder 1 can be attached.

The protruding from the bearing web A of the tension shaft 1 is 8 enclosed by an opening in the control lever 10. To limit movement of the control lever 10 and for feedback of the voltage position of the Tension shaft 1, the actuating lever 10 is surrounded by a bracket 14 which is on the side of the Front side of the printing form cylinder can be screwed. During the Steep lever 10 at its lower end with an actuating cylinder 11 over two Screws 13 is connected, is an adjusting element 15 at its upper end provided which is provided with a spring 24, so that on the Top of the manual control element 15 provided a manual approach Adjustment of the control lever 10 and thus the tension shaft 1 remains possible. The Approach for the tool on the upper part of the hand control element 15 can For example, be designed as a socket wrench attachment - be it as a square, Hexagonal or multi-wedge profile.

The one provided at the lower end, via a yoke with the lower part of the Actuating lever 10 on the cylinder end side of the actuating cylinder 11 is provided with a Provide quick exhaust 12 so that its operation is very quick can. The actuation time for the movement of the tension shaft 1 can thus be set to Minimum be reduced.

Fig. 3 shows a cross section through the tension shaft 1 in a bit enlarged scale.

The tension shaft 1 is in its axial extent with a recess provided, in which the support pins 3 are embedded, on which the Spring elements 2 are added. The individual support pins 3 are 3 penetrated by screws 5 with a collar element 6 are provided. The screws 5 extend into a thread that inside the tension shaft 1 is formed. By means of the screw 5 and the collar 6 are the spring elements 2 are connected to the support pin 3. With the axis of the Aligning the tensioning shaft 1, a tensioning lug 8 is formed in the center thereof, in the 3 as a square.

Fig. 4 shows a perspective top view of a cylinder face of the Printing form cylinder.

According to the plan view, there is a cylinder journal 22 on the end face 21 surrounding recess created by means of individual removable Covers can be protected against contamination. In the cylinder 20, the circumferential surface of which is partially cut away are the spring elements 2 let in with which the rear edge 18 of the printing form 16 is held. For Representation of the components arranged under the removable segments the covers of the tensioning device are removed. The covers can be attached to the pin protruding pin.

The bearing plate 7, of which the Bearing web A of the tension shaft 1 is enclosed. Between end shield 7 and the top 9 of the upper lever arm of the actuating lever 10 is shown, which - here covered by the attachment 9 - encloses the tension shaft extension 8. The clutch 23 is shown in front of it. The control lever 10 extends along the end face 21 of the printing form cylinder 20, the actuating lever 10 actuating actuator 11 is flanged in the lower region of the end face 21. The actuating unit 11, which is designed, for example, as a pneumatic actuating cylinder can be provided with a quick exhaust 12, so that the operating times drastically shorten.

On the coupling 9, the tool attachment 19 is for a manual one Actuator provided, see also Fig. 5. By means of a Tool can be a bolt provided below the starting point 15 twist, which is biased by a spring 24 with which the Tension shaft approach and the lever 10 is actuated.

Fig. 5 shows the side view of the printing form cylinder end face 21 and in Detail three cross sections through the tension shaft bearing.

The actuating lever 10 is connected at its lower end to the actuating unit 11 and includes with its upper end - as already explained above - the Tension shaft extension 8 of the tension shaft 1. The adjusting lever 10 is of a bracket 14 enclosed, with which the travel is limited. The top view of the End face 21 of the printing form cylinder 20 of the coupling 23 is mounted, which is located on a shoulder above the pin 22 of the printing form cylinder 20. In 5 in front of the coupling 23, the attachment is 9 shown, which partially hides the clutch 23.

The detail according to FIG. 5 at the top left shows the view of the control lever 10 Removed clutch 23 above the cylinder pin 22. The adjusting lever 10 encloses the tension shaft extension 8 and includes one below the Unlocking element 15 lying spring 24 which the unlocking element 15th encloses. By turning the unlocking element 15 can Pressure drop in the pneumatic actuator 11, which is quite a Commercially available pneumatic cylinder can be an actuation of the tension shaft 1 be guaranteed. In the adjacent detail in FIG. 5, the actuating lever 10 removed, whereby the bearing plate 7 is visible. In this is a bearing web A Tension shaft 1 is added and can be used with a lubricating nipple Grease filling or the like can be provided to make it easy to move guarantee. After dismantling the end shield 7 from the Cylinder face 21, the tension shaft 1 laterally from the bore in Printing unit cylinder 20 can be removed without first being disassembled ought to. On the tension shaft 1, the spring elements 2, the support pins 3rd and the screw connections 5 remain.

In the representations according to FIGS. 6 and 7, the geometry of the Span channels shown in more detail.

6 shows the channel 19 in the printing form cylinder 20 on an enlarged scale. The Channel 19 is from a left channel side wall 19.1 and one opposite channel side wall 19.2 limited, in which a Recess F is embedded. The one between the opposite Edges of the channel side walls 19.1, 19.2 of the channel 19 result in pressure-free Room G is a few millimeters. From the inner surface 26 of the cylinder bore The tensioning channel 19 extends outward in a trapezoidal shape.

As shown in Fig. 7, the upper part of the spring element 2 in the Immerse recess F and reach under the rear area of one Printing form 16 within an area L, as indicated in FIG. 7. Thereby remains enough play T im during the mounting process of the printing form 16 Channel 19 to ensure correct insertion of the printing form trailing edge 18 in the Ensure channel 19. Even if the angled area of the Printing form trailing edge 18 too short or irregular or sloping is formed, the individually attached to the tension shaft 1 Spring elements to reliably grasp 2 individual areas of the rear edge and after actuation of the actuating unit 11 also to tension. At the Clamping process takes place a movement of the printing form trailing edge 18 on the Printing form front edge 17, which over the radius R of the channel side wall 19.1 of the channel 19 is mounted. If we twist the tension shaft 1, they adapt individually mounted spring elements 2 each the contour of Printing form trailing edge 18 and tension it. By dipping the top Sections of the spring elements 2 in the recess F, J can play T between the area delimiting the recess F, J and the Printing form trailing edge 18, which also the correct attachment guaranteed less precisely manufactured printing forms 16 in the channel 19.

Reference list

A

Footbridge

B

Footbridge

C.

medium storage

D

Longitudinal opening

E

Spring adjustment

F

surface

G

pressure-free space

H

Flat area

I.

Flat area

J

Flat area

K

cylindrical surface

R

radius

T

game

L

Gripping area

1

Tension shaft

2nd

Spring element

3rd

Support pin

4th

Fastener

5

screw

6

collar

7

End shield

8th

Tension shaft

9

clutch

10th

Control lever

11

Actuating cylinder

12th

Quick exhaust

13

Recess

14

hanger

15

Unlocking element

16

Printing form

17th

Leading edge

18th

Trailing edge

19th

channel

19.1

Canal side wall

19.2

Canal side wall

20th

cylinder

21

Face, laterally

22

Cones

23

clutch

24th

feather

25th

Outer surface / tension shaft

26

Inner surface / printing form cylinder bore

Claims (13)

Device for holding a printing form on the circumference of a Printing form cylinder, the front edge of the printing form a Leading edge of one extending along the peripheral surface of the cylinder extends over the tensioning channel and the trailing edge of the flexible Printing form by at least one attached to a tension shaft resilient holding element is fixable, with individual resilient Holding elements are arranged side by side, characterized in that that individually mounted spring elements (2) on the tensioning shaft (1) are attached, the rear edge (18) when the tensioning shaft (1) is actuated reach behind a printing form (16) with play (T). Device for holding a printing form according to claim 1, characterized in that the spring elements (2) by means of individual Support pins (3) are supported in the channel of the tensioning shaft (1). Device for holding a printing form according to claim 1, characterized in that the spring elements (2) with a essential portion of its length over the peripheral surface (25) of the Protruding the tension shaft (1). Device for holding a printing form according to claim 1, characterized in that the one rear edge (18) of the Printing form (16) under the end of the spring element (2) in one Recess (F, J) in a channel side wall (19.2) of the channel (19) in Printing form cylinder (20) immersed. Device for holding a printing form according to claim 1, characterized in that the rear edge (18) of the printing form (16) engaging end of the spring element (2) the rear edge (18) in Direction of the radius (R) of the channel side wall (19.1) spans. Device for holding a printing form according to claim 1, characterized in that the tension shaft (1) via a Tension shaft extension (8) by means of a on the end face (21) of the printing form cylinder (20) stored actuator is actuated. Device for holding a printing form according to claim 1, characterized in that the movement by means of a bracket (14, 15) of the control lever (10) can be limited. Device for holding a printing form according to claim 7, characterized in that on the end face (21) of the Printing forme cylinder (20) an actuator (11) is mounted, with which the Tension shaft (1) can be actuated. Device for holding a printing form according to claim 1, characterized in that the tension shaft (1) with three bearing webs (A, B, C) is received in a bore of the printing form cylinder (20). Device for holding a printing form according to claim 1, characterized in that the tension shaft (1) after dismantling a of end shields (7, 23) completely from the printing form cylinder (20) is removable. Printing form cylinder with a device for holding a printing form, wherein the leading edge of the printing form has a leading edge along it extends over the circumferential surface of the cylinder extending channel and the trailing edge of the flexible printing form by at least one a tensioning shaft attached, resilient holding element can be fixed, wherein individual resilient holding elements are arranged side by side, characterized in that individually mounted on the tension shaft (1) Spring elements (2) can be fastened which, when the tensioning shaft (1) is actuated reach behind the rear edge (18) of a printing form (16) with play (T). Printing unit of a rotary printing press with a device for Holding a printing form on the circumference of a printing form cylinder, the The leading edge of the printing form has a leading edge along the Extending circumferential surface of the cylinder extending clamping element and the trailing edge of the flexible printing form by at least one a tensioning shaft attached, resilient holding element can be fixed, wherein individual resilient holding elements are arranged side by side, characterized in that individually mounted on the tension shaft (1) Spring elements (2) can be fastened which, when the tensioning shaft (1) is actuated reach behind the rear edge (18) of a printing form (16) with play (T). Printing unit of a rotary printing press with a printing form cylinder, a device for holding a printing form on the circumference of a Includes printing form cylinder, the front edge of the printing form Leading edge of one extending along the peripheral surface of the cylinder extending clamping element overlaps and the rear edge of the flexible printing form by at least one on a tension shaft attached, resilient holding element is fixable, with individual resilient Holding elements are arranged side by side, characterized in that that individually mounted spring elements (2) on the tensioning shaft (1) can be fastened when the tensioning shaft (1) is actuated Reach behind edge (18) of a printing form (16) with play (T).

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