EP1038672B1 - Device for tensioning of printing plates in lock-up gaps having a reduced size - Google Patents

Abstract

Individually supported spring fittings (2) mounted on the clamping shaft engage with the rear edge (18) of the printing plate (16), whilst allowing play (T). The front edge (17) of the flexible printing plate hooks into clamping channel (19) extending in the cylinder cross-section. The rear edge of the plate is fixed in place using at least one resilient fastener secured to a clamping shaft, individual fasteners being placed side by side. Independent claims are also included for (a) printing cylinders with plates mounted on them using this device, and (b) rotary printing machines containing these cylinders.

Description

From EP 0 639 454 B1 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 formed against the direction of rotation hook. 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 regarding 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 to the 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force against the direction of rotation of the Exercise cylinder, the hook then into the interior of the slot is withdrawn with respect to the outer peripheral surface of the support cylinder.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 inserted into 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 sheet having a first one with respect to the Has axis of rotation of the support cylinder radially inner end portion, 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 brought up. 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 for the assembly of printing forms without tools.

EP 0 680 826 A2 relates to a device for fastening a flexible pressure plate. This includes an axial cylinder pit, the leading one edge Plate leg carries and in which a spindle rotatable about its axis is arranged is. There are either one or more of the width of the pressure plate on the spindle Leaf springs distributed over the width of the pressure plate and angled by approximately 90 ° in the manner of a hook arranged. These positively grasp the trailing plate leg. The Spindle has a driving edge with which it is formed on a particular V-shaped Notch of the leading plate leg attacking it tightens.

US 5,213,038 relates to a plate changing device for rotary printing presses. A tension shaft is received in a bore in the peripheral area of a plate cylinder and contains a receiving opening over almost its entire length. In the opening a number of leaf springs are included. Each leaf spring is U-shaped educated. One end is provided with a pressure area, which is the front edge the printing form presses against a wall of the clamping channel. The other end of the U-shaped Leaf spring includes a curved area with which a folded end of the Printing form is gripped and held on the peripheral surface of the plate cylinder.

By means of a prestressing element, the tensioning shaft is moved in its respective specific direction of rotation emotional. An actuator is coupled to one end of the tension shaft. A pressure roller extends in the axial direction of the plate cylinder in the area the peripheral surface of the plate cylinder and is by means of a drive on the front edge movable to or away from the printing form. With a control unit the movements of the tension shaft, the biasing element, the number of leaf springs, the Tension shaft actuation device and the pressure roller to match each other Coordinated times.

Based on the outlined prior art, the invention is based on the object the manual mounting of a finite printing plate onto a printing form cylinder or to facilitate or improve by means of automatic printing form feed devices.

According to the invention this object is achieved in that in a device for Holding a printing form on the periphery of a printing form cylinder, with a leading edge the printing form, a leading edge of a along the peripheral surface of the printing form cylinder extending clamping channel overlaps and the rear edge of the flexible printing form can be fixed by at least one spring element attached to a tension shaft, individual spring elements are arranged next to one another and the ones that are received on the tensioning shaft, individually mounted spring elements with the rear edge of the printing form Reach behind the game, the ends of the spring elements, the rear edge within the Tensioning channel, which of a channel side wall having a recess is limited and trapezoidal, starting from an inner surface of a cylinder bore extends in the direction of a pressure-free space in the radial direction, reach under and that the ends of the spring elements engaging under the printing form in the recess Immerse the channel side wall of the clamping channel in the printing form cylinder.

The advantages associated with this solution make it possible to print forms both manually as well as much easier to open using automatic printing form feeders, because the play between spring elements that reach under the printing form trailing edge, during the mounting process of the printing form relative movements of the printing form to the cylinder surface allows before the clamping device is actuated and the printing form clamped becomes. By means of the game provided, inaccuracies in the production of the printing form can be avoided 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 are by means of individual support pins, one of which is a spring element is assigned, supported in the channel of the tension shaft. This solution leaves the use from printing forms, the rear edge of which was not manufactured exactly, because the individual Spring elements are irregularities on the

Can adapt the printing form trailing edge more easily than, for example spring elements extending continuously over the entire width. By the The ends of the spring elements protrude above 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 region 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 form 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 ventilation is formed by means of 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 annularly extending 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 according to the invention can be particularly advantageously used in Use printing form cylinders of rotary printing machines, be they sheet or Fed rotary printing presses. The small, remaining non-printing The area around the tensioning channel saves 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 played.

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 according to FIG. 1 omitted.

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 include 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 The bearing web A shown is provided with an opening 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 tensioning 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 Tensioning shaft 1, the actuating lever 10 is surrounded by a bracket 14 which is on the side of the Front of the printing form cylinder can be screwed. During the Control lever 10 at its lower end with an actuating cylinder 11 over two Connected screws, 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 as a socket wrench - 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 equipped 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 on 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 Plate 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. to Representation of the components arranged under the removable segments the covers of the tensioning device are removed. The covers can to 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 clutch 9 is the tool attachment for a manual 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 range is limited. The top view of the End face 21 of the printing form cylinder 20, the clutch 23 is mounted, which 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 adjusting 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. 5 is the setting lever 10 removed, whereby the bearing plate 7 is visible. In this is a bearing A Tensioning shaft 1 is added and can be connected with a 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 can the tension shaft 1 laterally from the bore in Printing unit cylinder 20 can be removed without first being disassembled would. 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 sufficient play T im remains during the mounting process of the printing form 16 Channel 19 to a 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.

LIST OF REFERENCE NUMBERS

A

bearing web

B

bearing web

C

medium storage

D

longitudinal opening

e

spring-loading of

F

surface

G

pressure-free space

H

plane surface

I

plane surface

J

plane surface

K

cylindrical surface

R

radius

T

game

L

seizure area

1

clamping shaft

2

spring element

3

support pin

4

connecting element

5

screw

6

collar

7

end shield

8th

Clamping shaft extension

9

clutch

10

lever

11

actuating cylinder

12

Quick exhaust

13

recess

14

hanger

15

unlocking

16

printing form

17

leading edge

18

trailing edge

19

channel

19.1

left channel side wall

19.2

Channel sidewall

20

cylinder

21

Face, laterally

22

spigot

23

clutch

24

feather

25

Outer surface / tensioning shaft

26

Interior surface / printing form cylinder bore

Claims (12)

1. Device for holding a printing form (16) on the circumference of a printing form cylinder (20), wherein a leading edge (17) of the printing form (16) extends over the leading edge of a tensioning gap (19) extending along the circumferential surface of the printing form cylinder (20) and the trailing edge (18) of the flexible printing form (16) is fixable by at least one spring element (2) fastened to a tensioning shaft (1), wherein individual spring elements (2) are arranged adjacent to each other and the spring elements (2) that are received on the tensioning shaft (1) and supported individually (2) extend behind the trailing edge (18) of the printing form (16) with play (T), characterized in that the ends of the spring elements (2) extend underneath the trailing edge (18) within the tensioning gap (19), which is limited by a gap side wall (19.2) having a recess (F, J) and extends in a trapezoidal shape from an interior surface (26) of a cylinder bore in the direction of a non-printing area (G) in the radial direction, and that the ends of the spring elements (2) extending under the trailing edge (18) of the printing form (16) enter into the recess (F, J) of the gap side wall (19.2) of the tensioning gap (19) in the printing form cylinder (20).
2. Device for holding a printing form according to claim 1,
   characterized in that the spring elements (2) are supported in the gap of the tensioning shaft (1) by individual support pins (3).
3. Device for holding a printing form according to claim 1,
   characterized in that the spring elements (2) protrude beyond the circumferential surface (25) of the tensioning shaft (1) with a major section of their length.
4. Device for holding a printing form according to claim 1,
   characterized in that the end of the spring element (2) extending under the trailing edge (18) of the printing form (16) tensions the trailing edge (18) in the direction of a radius (R) of the left-hand gap side wall (19.1).
5. Device for holding a printing form according to claim 1,
   characterized in that the tensioning shaft (1 ) is actuated via a tensioning shaft attachment (8) by means of an actuating unit supported on the end face (21) of the printing form cylinder.
6. Device for holding a printing form according to claim 1,
   characterized in that the movement of an actuating lever (10) is limitable by means of a bracket (14, 15).
7. Device for holding a printing form according to claim 6,
   characterized in that an actuating unit (11) for actuating the tensioning shaft (1) is supported on the end face (21) of the printing form cylinder (20).
8. Device for holding a printing form according to claim 1,
   characterized in that the tensioning shaft (1) is received in a bore of the printing form cylinder (20) via three bearing webs (A, B, C).
9. Device for holding a printing form according to claim 1,
   characterized in that the tensioning shaft (1) is completely removable from the printing form cylinder (20) after a demounting of one of several bearing plates (7, 23).
10. Printing form cylinder with a device for holding a printing form according to one or
    more of the preceding claims 1 to 9.
11. Printing unit of a rotary printing press with a device for holding a printing form on the circumference of a printing form cylinder according to one or more of claims 1 to 9.
12. Printing unit of a rotary printing press with a printing form cylinder having a device for holding a printing form on the circumference of the printing form cylinder according to one or more of claims 1 to 9.

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