DE102007002785B4 - Rotationally symmetrical body with a clamping device for fastening plate-shaped objects - Google Patents

Abstract

Rotationally symmetrical body on its outer periphery, in at least one recess a clamping device consisting of a fixed upper terminal block and a movable lower terminal strip, which is displaceable in a clamping and in a change position, is arranged for fixing plate-shaped objects, characterized in that the gap height between lower (5) and upper clamping strip (4) can be preselected via adjustably designed spring elements (9) corresponding to the thickness of the plate-shaped object (11), these spring elements (9) at the lower end of a lower arm (8) and an upper arm (9) formed rigid hinge (7) are arranged.

Description

The invention relates to a rotationally symmetrical body, on the outer circumference in at least one recess, a clamping or clamping device is arranged for securing plate-shaped objects.

Clamping or clamping devices for fastening plate-shaped objects, such as clamping or clamping devices for securing printing plates on a plate cylinder of a printing press are known in very large variety, wherein the pressure plate can be clamped with a defined holding force, but the Forces are comparatively low and for various plate thicknesses and plate materials (metallic or non-metallic plates) not universally applicable with a consistently high clamping force.

The DE 42 15 612 C1 relates to a clamping device for printing plates, in which a printing cylinder is provided with a terminal block and a clamping bar for receiving the printing plate. Of significant disadvantage in this solution is that this clamping device can only be used for printing plates in a very narrow tolerance range.

From the DE 26 26 503 A1 a device for fixing flexible printing plates on the forme cylinder of printing machines is known in which axially parallel arranged in the form of cylinder channel clamping elements consisting of an approximately perpendicular to the cylinder axis or clamping surface positively guided terminal strip which presses the pressure plate each against a clamping rail, which for clamping the pressure plate moves approximately in the circumferential direction of the cylinder.

So is out of the DE 10 2004 052 826 A1 is a device for fixing printing plates on a plate cylinder of a printing press with a fixed upper terminal block and an engageable in a clamping and a change position lower terminal block is known in which an actuator is designed as a positive toggle mechanism, which consists of at least one radial displacement enabling sliding mounted upper support roller and a control roller with the upper support roller optionally in a dead center, in which the mutually parallel axes of rotation intersects a radially extending straight line and in a dead center, in which the axis of rotation of the actuating roller is positioned spaced from the straight line, can be moved exists ,

A disadvantage of the disclosed herein technical solution is the fact that the structural design of the toggle mechanism consists of three individual, not interconnected round pieces, so that the proposed knee lever is not durchschaltbar. It is also disadvantageous that only a small gap thickness can be realized for receiving the pressure plate to be clamped and only relatively small holding forces can be transmitted or applied.

With the DE 195 11 956 A1 discloses a disc clamping device for mounting printing plates on the plate cylinder in printing presses, comprising a fixed upper clamping strip and a displaceable lower clamping strip, which is also brought into a clamping and a change position, in which the lower clamping strip formed as a bending-stressed elastic component is, whereby a maximum force for clamping the pressure plate, without any deformation of the pressure plate, is applied.

The disadvantage here, however, that the upper end of the leaf spring package is pressed directly against the underside of the pressure plate to be clamped and thereby more or less severely cuts into it, so that with this device very thin-walled printing plates not at all with the required force can be clamped, because under certain circumstances, the clamping area can be separated. A further disadvantage is that the leaf spring package over time shows fatigue, whereby the holding force can not be applied to the required extent.

The DE 295 06 864 U1 is a clamping device for securing printing plates on the plate cylinder of printing presses, consisting of a cylinder fixed lower terminal strip and a Kniehebelmechanismen be brought into a Plattenklemm- or plate change position upper terminal block again, the toggle mechanisms by means of a pressure medium expandable second tube in a dead center or Overtorage and can be brought by an expandable first tube from the dead position or Übertotlage and at least one of the coupling of the toggle mechanisms is elastic.

The disadvantage here is that caused by the structural design, when clamping the pressure plate displacements can not be excluded, so that the cost of preparing the actual printing process is relatively high. Again, to be reckoned with fatigue of the spring package. Furthermore, in this embodiment no greater variability in terms of the material or the material thickness of the printing plates to be used is possible.

The invention is therefore the object of a rotationally symmetrical body, on the outer circumference in at least one depression a clamping device for fixing plate-shaped objects is arranged to improve to the effect that can be clamped by means of the clamping or clamping device a variety of plate materials and plate thickness ahne bearing correction with a maximum force without deformation ,

According to the invention, this object is achieved by mutatis mutandis, that the clamping or clamping device consisting of a fixed upper terminal block and a movable lower terminal block, which is displaceable in a clamping and in a change position, the lower terminal block at its inner to the rotationally symmetrical Body-facing side is provided a bearing in which the outwardly directed end of the upper arm of a rigid element (joint) is slidably received.

A significant advantage of this solution according to the invention is to be mentioned that must be applied by the use of a rigid element (joint) for relatively low switching forces but high clamping forces can be realized.

Another advantage of the invention is the possible becoming variation of the applied clamping forces on the resilient mounting at the end of the rigid element (joint).

Another advantage is that due to the very high realizable clamping forces in connection with the massive lower terminal strip, a universal use for both metallic (eg aluminum) and non-metallic plates (eg polyester) with different Plate thickness is enabled.

When using plate-shaped objects ( 11 ) made of relatively soft material, the plate-shaped object ( 11 ) facing surfaces of the lower ( 5 ) and upper terminal block ( 4 ) be provided with a corrugation.

Show it

1 a clamping device in changing position,

2 : the clamping or clamping device in clamping position with clamped plate.

The 1 shows in a sectional side view of a clamping or tensioning device in the change position.

The change position is by appropriate switching of the adjusting elements, here for example by means provided (pneumatic or hydraulic pressure medium expandable pressure hoses 12 respectively. 13 reached, in which the pressure hose 13 is pressurized and so the rigid element (joint) 7 deflects to the right, causing the lower terminal block 5 acting force is withdrawn. At the same time the pressure hose 12 relieved.

In the rotationally symmetrical body 1 Here, for example, a plate cylinder of a printing press, is in a designated recess, the cylinder channel 2 , the clamping or clamping device 3 arranged.

The upper terminal block 4 the clamping or clamping device 3 is fixed and formed with the plate cylinder 1 firmly connected. The upper terminal block 4 has a clamping surface 4.1 , on, against which the aufzuspannende pressure plate with the lower terminal block 5 is fixed or clamped.

In the lower terminal strip 5 is at her to the inside of the plate cylinder 1 pointing site a depository 5.1 , provided, this bearing point 5.1 , in its cross section as a triangle in the lower terminal block 5 is incorporated. In this depository 5.1 , is the outward end of the upper arm 6 a rigid element 7 slidably received.

The terminal strips extend 4 and 5 over the entire width of the plate cylinder 1 , It is also conceivable that the terminal strips 4 respectively. 5 are designed only in the width of the pressure plate to be fixed.

The rigid element (joint) 7 is formed from the movably connected upper arm 6 and lower arm 8th , over the length of the clamping or clamping device 3 are at the same possible intervals several such rigid elements (joint) 7 arranged distributed. The upper arm 6 is about the depository 5.1 , in the lower terminal strip 5 added. The lower arm 8th becomes through the arranged storage place 4.2 , on the upper terminal strip 4 supported.

The bearings 4.2 , are also spaced apart and at least at one end of the joints 7 with an adjustable spring element 9 stored. The gap height and the applied force can by means of a biasing device 10 be set.

The 2 shows in a sectional side view of the clamping or clamping device 3 in the clamping position.

The clamping position is achieved by the pressure hose 12 pressurized and the pressure hose 13 is relieved and so the rigid element (joint) 7 is printed to the left, causing the lower terminal block 5 the force is applied. This will now be in the previous distance between the clamping surface 4.1 , and the upper surface of the lower terminal block 5 introduced pressure plate 11 fixed and securely clamped.

Through the use of an adjustable spring element 9 in conjunction with a pretensioner 10 it is possible aufzuspannen plate-shaped objects securely on rotationally symmetrical bodies, with plate thicknesses of, for example 0.1 to 1 mm can be clamped with a single clamping device.

LIST OF REFERENCE NUMBERS

1

plate cylinder

2

cylinder gap

3

Clamping or clamping device

4

upper terminal block

4.1.

clamping surface

4.2.

depository

5

lower terminal block

5.1.

depository

6

upper arm

7

rigid element (joint)

8th

lower arm

9

spring element

10

biasing means

11

Pressure plate / plate-shaped object

12

pressure hose

13

pressure hose

Claims (6)

Rotationally symmetrical body on its outer periphery, in at least one recess a clamping device consisting of a fixed upper terminal block and a movable lower terminal strip, which is displaceable in a clamping and in a change position, is arranged for fixing plate-shaped objects, characterized that the gap height between lower ( 5 ) and upper terminal block ( 4 ) via adjustable spring elements ( 9 ) according to the thickness of the plate-shaped article ( 11 ) is preset, these spring elements ( 9 ) at the lower end of the lower arm ( 8th ) and an upper arm ( 9 ) formed rigid joint ( 7 ) are arranged. Rotationally symmetrical body with a clamping device according to claim 1, characterized in that the spring element ( 9 ) with a biasing device ( 10 ) is combined. A rotationally symmetrical body with a tensioning device according to claims 1 and 2, characterized in that the lower arm ( 8th ) of the rigid joint ( 7 ) by a plurality of spaced apart bearings ( 4.2 ) at the interior of the rotationally symmetrical body ( 1 ) facing part of the upper terminal block ( 4 ), wherein the downward-pointing end of the lower arm ( 8th ) with the spring element ( 9 ) is stored. Rotationally symmetrical body with a tensioning device according to claims 1 to 3, characterized in that the bearing point ( 5.1 .) In its cross section at least partially as a triangle in the lower terminal block ( 5 ) is incorporated. Rotationally symmetrical body with a tensioning device according to claims 1 and 2, characterized in that over the length of the lower clamping strip ( 5 ) distributes several rigid joints ( 7 ) are arranged. Rotationally symmetrical body with a tensioning device according to claims 1 to 5, characterized in that when using plate-shaped objects ( 11 ) of relatively soft material which the plate-shaped object ( 11 ) facing surfaces of the lower ( 5 ) and upper terminal block ( 4 ) are provided with a corrugation.

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