DE4142754C2 - Device for adjusting the printing pressure of cylinders in printing machines - Google Patents

Description

The invention relates to a device for adjusting the pressure pressure of cylinders in Printing machines, according to the preamble of claim 1.

Devices for adjusting the printing pressure of cylinders in printing presses are known.

Such a device is shown in DD-PS 86 631. This device is so ge designed that a rubber cylinder and a plate cylinder for adjustment to each other and a common adjustment in relation to a pressure cylinder, in eccentric bushes device and the eccentric bushes are connected by gears. In the gears are for relative movement of the plate cylinder to the rubber cylinder, one adjusting means and one for relative movement of the blanket cylinder, together with the plate cylinder, to the printing cylinder One or more actuators are arranged for each machine side wall. Both Eccentric bushes have the same eccentricity, and the gears are made of one each two links and a coupling existing parallel rocker formed, the coupling the parallel swing arm each from an adjusting means for the movement between plate and Rubber cylinders and one guide part each.

To limit the swivel path and to set the pressure between Pressure cylinders, rubber cylinders and plate cylinders are in the area of the handlebars and the feet adjustable stops attached.

A disadvantage of this device is that the uniform joint delivery of the The pressure and rubber cylinder only work when the bearer ring contact runs if the same paper thickness is processed. When processing a different paper thickness, the Printing pressure can be readjusted.

This is done in such a way that the respective stops are adjusted, which means a considerable amount of setup time.

Another disadvantage is that the gear connection according to DD-PS 86 631 is too has an additional degree of freedom, which is compensated for by a second drive. This means an additional manufacturing effort that is unnecessary and only leads to inaccuracies during the in and out movement.  

From DE 24 49 923 A1 it is known to provide a gear for the on / off movement of Zy alleviate with an elastic element, while it from EP 0 193 012 B1 is known, the synchronous setting of several mutually associated cylinders using make elastic elements.

The invention has for its object a device for adjusting the printing press to create cylinders in printing presses that work with both as well as without a bearer ring contact a common, synchronous setting of several cylinders which enables each other in one setting process.

The object is achieved by a device having the features of claim 1.

The advantage of the device according to the invention is that it is possible with Ver working a different paper thickness the pressure between the printing and rubber cylinder which can be readjusted without the pressure between the rubber and plate cylinders to change. Furthermore, it is advantageous that the arrangement of an elastic element elements in front of the regulating gear for setting the pressure between rubber and Plate cylinder compensates for the expansion of various components caused by heat can be.

The arrangement of an elastic element in front of the regulator to adjust the Printing pressure between the rubber and impression cylinder has the advantage that with it possible overloads (e.g. double sheet) can be compensated NEN.

The invention will be explained in more detail below using an exemplary embodiment the.

Show in the accompanying drawings

Fig. 1: Printing unit of a printing machine,

Fig. 2: Cylinder arrangement with gear diagram schematically

Fig. 3: the storage of the blanket cylinder.

Fig. 1 shows a schematic representation of a printing unit 1 of a printing press with a printing, rubber and plate cylinder 2 ; 3 ; 4 and a first and a second transfer drum 5 ; 6 . The sheets 9 are guided in the usual way to the printing unit 1 and are transferred there from the transfer drum 5 to the printing cylinder 2 . During the passage between the impression cylinder 2 and the blanket cylinder 3 , the sheets 9 are printed. Since it is important for the quality of the resulting print image that between the printing cylinder 2 and the blanket cylinder 3 a pressure press solution corresponding to the paper thickness is set.

In FIG. 2, the inventive arrangement of the transmission links is shown for printing and regulation circuit, whereby the tracking of the plate cylinder 4 by means before each of the worm gears 7, 10; 8 , 11 arranged elastic elements 44 , 45 is realized. One recognizes two the setting of the pressure between the rubber and pressure cylinder 3 , 2 and between the rubber and plate cylinder 3 , 4 serving gear 45 , 11 , 8 , 36 , 22 , 52 , 16 and. 44, 10, 7, 36, 13, 18 which are of the same design and are described below by the drive beginning. One can see two shafts 23 arranged parallel to one another and mounted in the frame (not shown), which can be rotated by means of a handwheel 19 , 20 arranged on the shaft 23 .

A compression spring 44 , 45 and a cylindrical screw 10 , 11 located behind each are arranged on the shaft 23 within the frame (not shown). The compression springs 44 , 45 are designed such that they generate restoring forces in the order of magnitude of the pressure forces occurring in the pressure zone.

The arrangement is such that the cylindrical screws 10 , 11 are constantly under a pretension generated by the compression springs 44 , 45 . Above or below the cylinder worm 10 , 11 , a worm wheel 7 , 8 is arranged, which worm with the cylinder worm 10 , 11 is in contact. A two-articulated drive member 36 is rotatably arranged centrally on the worm wheels 7 , 8 .

A coupling element 13 or a coupling element 22 is arranged at the respective second articulation point of the drive element 36 . The gear 44 , 10 , 7 , 36 , 13 , 18 for Druckpressungsregulie tion between rubber and plate cylinders 3 , 4 associated coupling member 13 is further connected directly to an angled output member 18 .

The coupling 22 assigned to the transmission 45 , 11 , 8 , 36 , 22 , 52 , 16 for regulating the pressure between the pressure and rubber cylinders 2 , 3 is connected to a rocker 52 at the articulation point 26 . At the other pivot point of the rocker 52 , an angled output member 16 is directed to. A pressure control gear 21 is also articulated in the articulation point 26 .

The angled output members 16 , 18 are fixedly connected to the eccentric bushes 48 arranged in the side wall (not shown), the exact arrangement of which can be seen in FIG. 3.

The eccentric bushes 48 are mounted without play in the side wall by means of a three-point bearing and each receive the rubber or plate cylinder journal 49 , 24 via a bearing 51 .

The three-point bearing is designed such that three eccentric bolts 47 , each mounted in a counter-pressure roller 46 and in a roller bearing 50 and guided in the side wall, support the eccentric bushings 48 .

The running play necessary for the function is generated by adaptive grinding of the inner ring of the rolling bearing 50 .

The operation of the device according to the invention is as follows:
At "Druckab" is the rubber cylinder 3 in the ge in Fig. 2 with dashed lines drawn position. The pressure is switched off, ie cylinders 2 , 3 , 4 have no contact. When printing begins again, the pressure is initially set with the aid of the pressure setting gear 21 . For this purpose, the coupling 22 and the rocker 52 are brought into the extended position and the angled output member 16 brings the rubber cylinder 3 into contact with the pressure cylinder 2 and the plate cylinder 4 .

If pressure regulation between the plate and blanket cylinders 4 , 3 is required, the gear 44 , 10 , 7 , 36 , 13 , 18 used for this purpose is actuated. The shaft 23 and thus the worm 10 is rotated via the handwheel 19 arranged outside the frame. This causes a rotation of the worm wheel 7 and, via the drive member 36 connected to the worm wheel 7 , a displacement of the coupling member 13 , which leads to a pivoting movement of the drive member 18 connected to the coupling member 13 . This means that the eccentric bush 48 is rotated and the plate cylinder journal 24 is brought into a different position with the plate cylinder 4 . The pressure between the rubber and plate cylinders 3 , 4 is increased.

If, however, due to the use of paper of a different grammage, the axle spacing of the blanket cylinder 3 for the impression cylinder 2 has to be changed, the gear 45 , 11 , 8 , 36 , 22 arranged on the blanket cylinder 3 is actuated. At the same time, however, the set pressure between the rubber and plate cylinders 3 , 4 must not be changed during this process.

For this purpose, the handwheel 20 arranged outside the frame is actuated, where the worm wheel 8 , which engages with the cylindrical worm 11 and the worm gear 11 with the cylinder 11 , is moved by the shaft 23 . Thereby, the worm wheel 8 disposed on the drive member 36 is pivoted and via the coupling 22 and the rocker 52, which connects the drive member 36 with the angled output link 16, then a pivoting of the angled output member sixteenth This means that the eccentric bushing 48 supporting the rubber cylinder pin 49 is rotated and thus the rubber cylinder 3 assumes a different position with respect to the pressure cylinder 2 . Due to the running in the bearer ring contact between the rubber and plate cylinders 3 , 4 , it is possible that the plate cylinder 4 is tracked by means of the pressure spring 44 arranged in front of the cylindrical screw 10 while maintaining the set pressure.

This is done in the manner that the worm wheel 7 Dersch corner by means of the stationary and with the worm wheel 7 in engagement constantly standing by the compression spring 44 under bias Zylin is pressed in a counterclockwise direction acting 10th The coupling of the drive member 36 , coupling member 13 , and angled output member 18 ensures that the plate cylinder 4 , since it runs in contact with the rubber cylinder 3 , is constantly pressed against the latter. This tracking is made possible because due to the existing toothed connection between the cylindrical worm 10 and worm wheel 7, a change in the position of the worm wheel 7 via gear members 36 , 13 , 18 articulated plate cylinder 4 is possible without the handwheel 19 being moved.

REFERENCE NUMBERS

1

printing unit

2

pressure cylinder

3

rubber cylinder

4

plate cylinder

5

Transfer drum

6

Transfer drum

7

worm

8th

worm

9

arc

10

cylindrical worm

11

cylindrical worm

13

coupling member

16

angled output link

18

angled output link

19

handwheel

20

handwheel

21

Pressure adjustment gears

22

paddock

23

while

24

Plate cylinder journal

26

fulcrum

36

drive member

44

elastic element

45

elastic element

46

Counter-pressure roller

47

eccentric

48

eccentric

49

Rubber cylinder journal

50

roller bearing

51

camp

52

wing

Claims (3)

1. Device for adjusting the pressure pressure of cylinders in printing presses, whereby for adjusting the pressure pressure from rubber to pressure cylinder and rubber to plate cylinder, each separately operable, from a worm drive representing the drive, a drive member arranged on this, a head attached to it pelglied and an arranged on the coupling member, the respective output cylinder to be adjusted angled output member are arranged, as characterized in that each before the adjustment of the play in a three-point position free play cylinders ( 3 ; 4 ) effecting each other regulating gears ( 44 , 10 , 7 , 36 , 13 , 18 ; 45 , 11 , 8 , 36 , 22 , 52 , 16 ) on whose worm drives ( 10 , 7 ; 11 , 8 ) are arranged ineffective elastic elements ( 44 ; 45 ), the restoring forces in Generate order of magnitude of the pressure forces in the pressure zone. 2. Device according to claim 1, characterized in that the three-point bearing is designed so that three the rubber u. Plate cylinder journals ( 49 ; 24 ) bearing eccentric bolts ( 47 ) are each mounted in a counter-pressure roller ( 46 ) and a roller bearing ( 50 ) provided with matching play with a running clearance. 3. Device according to claim 1, characterized in that the elastic element ( 44 ; 45 ) is designed as a compression spring.