EP0788881B1 - Clamping and pulling device for sleeves for cylinders in printing machines - Google Patents

Description

The invention relates to a clamping and Pulling device for lifts of cylinders in Printing machines according to the preamble of claim 1.

In such a known clamping and pulling device for the angled rear edge of the pressure plate on one Plate cylinder of a sheet-fed rotary printing press DE 42 27 683 C2 are terminal strips in a frame arranged and by clamping forces with their cheek surfaces pressable against each other, the frame in the cylinder channel guided radially to the cylinder axis and by the Cheek surfaces of the clamping strips formed with the clamping slot its radially outer boundary at least up to Circumferential contour of the cylinder cross section to the outside and with the pinched fold of the rear edge of the pressure plate movable back within the contour of the plate cylinder is thereby a pulling action on the pressure plate exercise. Both terminal strips are based on the known one Arrangement against each other and against the frame and thus against the plate cylinder, one on one Terminal strip acting actuator the clamping forces on the Clamping jaws and two further actuators the clamping forces in Apply the circumferential direction of the plate cylinder to the frame. An additional pressure roller is also required to to bring the plate onto the cylinder without a hollow position. Thereby is the effort for such a tensioning and pulling device quite high.

Furthermore, EP 0 563 601 A1 describes a clamping and Clamping device for a printing plate is known, in which for detection an angled end portion of the pressure plate provided under Preloaded gripping elements in the firing position and one Adjustment unit for opening the gripping elements arranged in a frame are, which is inserted into a channel of a cylinder. The frame is with respect to the cylinder essentially radially inwards by means of springs biased and by means of further adjustment units against the effect of these Springs can be moved radially outwards into a position in which the Gripping elements in an open position of the same for receiving the stand angled end portion of the pressure plate. The jamming this end section is then carried out by actuating the Adjusting unit attacking gripping elements in the sense of closing the Gripping elements and tensioning of the pressure plate are then carried out an actuation of the further adjustment units in the sense of a radially inward directed displacement of the frame under the force of this Adjusting units counteracting springs.

The invention has for its object an inexpensive clamping and Puller design that is common to both cylinder lifts the front edge as well as the rear edge is suitable, and the one smooth application of the fold of the elevator to one if necessary channel edge having different radius enables.

The invention solves this problem with a clamping and pulling device the features according to claim 1.

The particular advantage of the device is that with the Clamp movement immediately a pulling movement in the tensioning direction of the elevator is exercised so that around the edge of the cylinder channel with one of the Edge radius deviating curvature against cylinder lift the cylinder edge is pulled. The features of the invention make this possible Dragging the elevator around the channel edge. This avoids that a circumferential bead forms at the edge of the elevator because no air between the edge radius of the cylinder channel and the

The radius of curvature of the fold of the elevator remains.

A clamping and pulling device with these features is suitable for Printing plates, blankets and other cylinder lifts, preferably in Sheet-fed rotary printing machines. The device can be used both for clamping the front edge of the elevator and the rear edge of the elevator and to simultaneous pulling of the ends of the elevator can be used. she is constructively in a confined space and has no susceptible to failure

Mechanism on.

Contain essential features for the design of the subject matter of the invention claims 3 to 11.

The drawing shows an embodiment of the invention.

Figur 1

einen Querschnitt durch ein Ausführungsbeispiel einer in einem Zylinderkanal angeordneten Klemmund Ziehvorrichtung,

Die Klemm- und Ziehvorrichtung nach der Erfindung ist in dem am Umfang offenen und sich in axialer Richtung erstreckenden Kanal 1 eines Zylinders 2 einer Druckmaschine, vorzugsweise einer Bogenrotationsdruckmaschine, angeordnet. Der auf dem Zylinderumfang angeordnete Aufzug 3 weist an seiner Vorderkante eine Abkantung 4 auf, die in einen Klemmschlitz 5 in an sich bekannter Weise eingreift. In einer Ausnehmung 6 des Zylinderkanals 1 sind zwei Klemmleisten 7.1 und 7.2 angeordnet, von denen eine Klemmleiste 7.1 einen hakenförmigen Querschnitt aufweist und mit ihrem Steg auf einer Feder 8 ruht. Die andere Klemmleiste 7.2 stützt sich gegen ein durch die Ausnehmung 6 gebildetes Widerlager 9 ab. Die Klemmleisten 7.1 und 7.2 liegen mit ihren Klemmbacken 10.1 und 10.2 auf einander gegenüberliegenden Seiten an dem inneren Ende der Abkantung 4 des Aufzuges 3 an. Die eine Klemmleiste 7.1 stützt sich mit dem der Klemmbacke 10.1 gegenüberliegenden Ende gegen ein in dem Zylinder 2 beweglich angeordnetes Widerlager 9.1 ab. Durch die Widerlager der Klemmleisten 7.1 und 7.2 am Zylinder 2 und durch die Anlage der Klemmbacken 10.1 und 10.2 am inneren Ende der Abkantung 4 wird eine Winkellage der Klemmleisten 7.1 und 7.2 zueinander definiert, bei der der Winkelscheitel der Spannrichtung entgegengerichtet ist. Eine der beiden Klemmleisten 7 ist im Querschnitt hakenförmig ausgebildet, so daß sie die innere Kante der Abkantung 4 umgreift und die Klemmleiste 7.2 zur Abstützung untergreift. Gegen die Außenseite einer der beiden Klemmleisten 7.1 ist eine Spannschraube 15 in dem Muttergewinde einer Leiste 11 verschraubbar, so daß durch diese Spannschraube 15 die beiden Klemmleisten 7.1 und 7.2 in Richtung ihrer gegenseitigen Strecklage belastet werden können. Dadurch werden Klemmkräfte auf das innere Ende der Abkantung 4 und gleichzeitig Ziehkräfte in Spannrichtung des Aufzuges 3 wirksam, so daß der Aufzug stramm um die Kanalkante 1a herumgezogen und eventuelle Luft unter dem mit einer vom Kanalkantenradius abweichenden Krümmung vorhandene Luft herausgedrückt wird. Damit es sicher zur Haftreibung zwischen der Backenfläche 10.2 der Klemmleiste 7.2 und der Abkantung 4 kommt, ist die Klemmleiste 7.2 in Spannrichtung durch eine gegenüber der Feder 8 wesentlich schwächere Feder 13 belastet. Beim Lösen der Spannschraube 15 drückt die Feder 8 die Klemmleiste 7.1 und somit auch die Klemmleiste 7.2 gegen die schwächere Feder 13 nach oben, so daß die Backenflächen 10.1 und 10.2 das innere Ende der Abkantung 4 freigeben. Falls es dabei zu einer sich nicht selbsttätig lösenden Verspannung gekommen sein sollte, kann das bewegliche Widerlager 9.1 durch beliebige Stellglieder 16 zur Vergrößerung der Winkellage zwischen den beiden Klemmleisten 7.1 und 7.2 bewegt werden. Alternativ ist dies auch durch einen Exzenter 20 zu erreichen. It shows:

Figure 1

3 shows a cross section through an exemplary embodiment of a clamping and pulling device arranged in a cylinder channel,

The clamping and pulling device according to the invention is arranged in the circumferentially open and axially extending channel 1 of a cylinder 2 of a printing press, preferably a sheet-fed rotary printing press. The elevator 3 arranged on the circumference of the cylinder has on its front edge a bevel 4 which engages in a clamping slot 5 in a manner known per se. In a recess 6 of the cylinder channel 1, two clamping strips 7.1 and 7.2 are arranged, of which a clamping strip 7.1 has a hook-shaped cross section and rests with its web on a spring 8. The other terminal block 7.2 is supported against an abutment 9 formed by the recess 6. The clamping strips 7.1 and 7.2 rest with their clamping jaws 10.1 and 10.2 on opposite sides on the inner end of the fold 4 of the elevator 3. The one clamping strip 7.1 is supported with the end opposite the clamping jaw 10.1 against an abutment 9.1 movably arranged in the cylinder 2. Through the abutment of the clamping strips 7.1 and 7.2 on the cylinder 2 and by the contact of the clamping jaws 10.1 and 10.2 at the inner end of the bend 4, an angular position of the clamping strips 7.1 and 7.2 relative to one another is defined, in which the angular apex is opposite to the clamping direction. One of the two terminal strips 7 is hook-shaped in cross section, so that it engages around the inner edge of the bevel 4 and engages under the terminal strip 7.2 for support. A clamping screw 15 can be screwed into the nut thread of a strip 11 against the outside of one of the two clamping strips 7.1, so that the two clamping strips 7.1 and 7.2 can be loaded in the direction of their mutual extended position by this clamping screw 15. As a result, clamping forces on the inner end of the bend 4 and at the same time pulling forces in the tensioning direction of the elevator 3 are effective, so that the elevator is pulled tightly around the channel edge 1a and any air is pressed out under the air with a curvature deviating from the channel edge radius. So that there is static friction between the jaw surface 10.2 of the clamping strip 7.2 and the bevel 4, the clamping strip 7.2 is loaded in the tensioning direction by a spring 13 which is considerably weaker than the spring 8. When loosening the clamping screw 15, the spring 8 presses the terminal block 7.1 and thus also the terminal block 7.2 upwards against the weaker spring 13, so that the jaw surfaces 10.1 and 10.2 release the inner end of the fold 4. If there should not have been a self-releasing tension, the movable abutment 9.1 can be moved by any actuators 16 to increase the angular position between the two terminal strips 7.1 and 7.2. Alternatively, this can also be achieved by an eccentric 20.

REFERENCE SIGN LIST

1

channel

1a

Channel edge

2nd

cylinder

3rd

Elevator

4th

Folding

5

Clamping slot

6

Recess

7

Terminal strip (7.1 + 7.2)

8th

feather

9

Abutment (9.1)

10th

Cheek surfaces (10.1 + 10.2)

11

strip

13

feather

15

Tension screw

16

Actuators

20th

eccentric

Claims (9)

1. Device for fastening a bent-off end portion (4) of a packing (3) disposed on a circumferential surface of a printing unit cylinder (2), with an axial gap (1) formed in the circumferential surface, the axial gap (1) having a gap edge (1a) around which the bent-off end portion (4) of the packing (3) is passed, with gripper elements (7.1, 7.2) by means of which the bent-off end portion (4) is engageable, and with a gripper element clamping device (15), which, upon actuation in a first mode, causes the bent-off end portion (4) to be clamped by the gripper elements (7.1, 7.2) and, upon actuation in a second mode, causes the clamping action to be released,
   characterized in
   that, when the gripper element clamping device (15) is actuated in the first mode, the gripper elements (7.1, 7.2) execute a movement directed into the cylinder gap.
2. Device according to Claim 1,
   characterized in
   that the gripper elements are formed by two clamping bars (7.1, 7.2) having jaw surfaces (10.1, 10.2) and forming clamping jaws, and that the gripper elements are supported on abutments (9.1, 9) of the cylinder (2).
3. Device according to Claim 2,
   characterized in
   that, with respect to a normal to the bent-off end portion (4), the clamping bars (7.1, 7.2) assume an angular position in which a respective one of the clamping bars (7.1, 7.2) is inclined towards the end of the bent-off end portion.
4. Device according to claim 3,
   characterized in
   that, upon actuation in the first mode, the gripper element clamping device (15) loads the clamping bars (7.1, 7.2) in the direction of their extended position.
5. Device according to claim 4,
   characterized in
   that one of the clamping bars (7.1) engages the other one of the clamping bars (7.2) from behind and is supported on a spring (8) acting against the effective direction of the gripper element clamping device (15).
6. Device according to claim 5,
   characterized in
   that the one clamping bar (7.1) has a hook-shaped cross section and that a tip of the hook supports the other clamping bar (7.2) at the end thereof facing away from the abutment (9) and embraces the edge of the rim of the end portion (4) of the packing (3), the end portion being disposed between the clamping jaws (10.1, 10.2).
7. Device according to claim 6,
   characterized in
   that the other clamping bar (7.2) supported on the tip of the hook of the other
   clamping bar (7.1) is loaded against the tip of the hook by means of an additional spring (13) which is much weaker than the spring (8).
8. Device according to one of claims 2 to 7,
   characterized in
   that at least one of the two abutments (9.1) is adjustable with respect to the respective other abutment (9).
9. Device according to one of claims 1 to 8,
   characterized in
   that the gripper element clamping device (15) consists of a tightening screw.

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