DD250504A1 - SWITCHING DEVICE FOR COLOR WOOD BLOCKS IN PRINTING MACHINES - Google Patents

Abstract

The invention relates to a switching device for inking rollers in printing machines for on and off selected inking rollers and the washing doctor blade. The aim of the invention is to provide a switching device for inking rollers in printing machines, which can be produced with low production costs and contributes to the increase in ease of use and operating safety. The object of the invention to provide a switching device for inking rollers in printing presses, which excludes mutual interference of different procedural necessary Stellvorgaenge is achieved in that the intermediate rolls with the strand divider, the washing trough with squeegee and the Auftragwalzenabstellkurve are assigned separate working cylinder. Fig. 2

Description

For this 2 pages drawings

Field of application of the invention

The invention relates to a switching device for inking rollers in printing presses for arrival and dismissal of selected inking rollers and the washing doctor blade.

Characteristic of the known technical solutions

By DD-PS 221 690 an on and off device for inking rollers in printing machines has become known in which by a meaningful ink roller combination an adaptation to different print jobs is possible and color variations on the print carrier at the beginning and after printing interruptions should be avoided or compensated as quickly as possible.

By a six-member planar coupling gear more ink roller combinations can be realized according to print job.

Starting from a doctor shaft, to which also the washing doctor blade is fastened, two intermediate rollers, a strand divider roller and all four application rollers can be moved or switched on and off by means of the six-member planar coupling mechanism.

In order to realize these procedurally necessary adjusting movements of the inking rollers, the doctor shaft is rotated in four positions, with only one operating state of the inking unit is realized per position, although the entire transmission is involved in the movement.

The wash blade carries out this circular motion, whereby a considerable space is required and complex safety precautions to prevent injury to the operating personnel are necessary.

The transmission is expensive to manufacture and prone to failure due to necessary manufacturing tolerances of the transmission elements.

Object of the invention

The object of the invention is to provide a switching device for inking rollers in printing machines, which can be produced with low production costs and contributes to increasing the ease of use and operating safety.

Object of the invention

The object of the invention is to provide a switching device for inking rollers in printing presses, which excludes mutual interference of the different procedural necessary adjusting operations.

Essence of the invention

According to the invention the object is achieved by the characterizing part of the I.Anspruches.

The separate drives for wash blade and Farbwalzentrennung a simple electrical control (L / O signals) is possible in a particularly advantageous manner, whereby a rapid response to the various procedural necessary situations is achieved.

embodiment

The invention will be explained in more detail with reference to an embodiment. In the accompanying drawings show:

Fig. 1: schematic representation of an inking unit

Fig. 2: schematic representation of the switching device according to the invention.

The inking unit according to FIG. 1 consists essentially of an ink fountain 1 with the printing ink contained therein, a ductor 2 between which and the following ink supply rollers 4 a color lifter 3 is arranged. The Farbzuführwalzen 4 is a dye or Strangteilerwalze.5 downstream, via a first distribution cylinder 6 and two applicator rollers 7; T is in contact with a plate cylinder 8. About intermediate rollers 9; 9 'is the first distribution cylinder 6 with a second and third distribution cylinder 10; 11 and the applicator rollers 7 ", T" connected to the plate cylinder 8.

2, an angle lever 12 is rotatably mounted on a continuous actuating shaft 13. In the immediate vicinity of the drive member of the angle lever 12 is a first and a second hydraulic working cylinder 14; 15 arranged. On the output lever of the angle lever 12, a coupling 16 is movably arranged, which is movably connected to a four-bar linkage 17. The four-bar linkage 17 has two shift levers 18, which are rotatably mounted in the machine frame and whose free ends to the stub axles of the intermediate rollers 9; 9 'are articulated.

A rigid washing trough 19 with squeegee 20 can be adjusted to the third distribution cylinder 11. The washing trough 19 is mounted in a pivotable parallel guide, wherein the washing trough 19 is provided with an adjusting screw 21. Via a lever 22, a third hydraulic working cylinder 23 is connected to the washing trough 19.

On the steering knuckle of the plate cylinder 8 a Auftragwalzenabstellkurve 24 is rotatably mounted. In a known manner, applicator roll-off levers with rollers are in communication with the applicator roll stop curve 24.

A fixedly connected to the Auftragwalzenabstellkurve 24 actuator 26 is applied to a fourth working cylinder 25 at.

The operation of the device is the following:

By the rotational movement of the ductor 2 in the counterclockwise direction, a color profile of defined thickness is transferred to the surface thereof. This color profile is transmitted from the reciprocating color lifter 3 to the ink feed rollers 4, which moderate the ink comparison and rub into a thin ink film. Due to the arrangement of the following rollers, the application rollers 7 and 7 'more color supplied as the underlying plate in the plate cylinder direction of rotation.

Ink units of this type already have good quality features with respect to coloring in the longitudinal direction of the sheet.

By pressing the first working cylinder 14 in the position 1, the two intermediate rollers 9; 9'von the first distribution cylinder 6 and second distribution cylinder 10 lifted. The ink flow takes place only over the first two applicator rollers 7; T. The other two color strands have at "pressure on", ie all applicator rollers 7 to 7 '"employed on plate cylinder 8, the task of even further to equalize or compensate for the applied color.

This switching variant is preferably used in normal color consumption, since the so-called compensation groups get the color from the plate cylinder 8 and not from the roll association.

In the case of printing motifs with low ink consumption, on the other hand, the roller arrangement described at the outset may be advantageous since, when the rollers 9 and 9 'are arranged, the friction cylinders 6; 10 and 11 a connection of the rear roller groups with the fresh ink flow available and a so-called "dead running" of the color is excluded.

Both switching states of the inking unit are therefore meaningful variants according to the existing print motif.

When pressure is interrupted, the second working cylinder 15 is thrown into the position 2 and thus the strand divider roller 5 is lifted from the first distribution cylinder 6. In this case, the ink supply to the plate cylinder 8 is interrupted and the contact between the three color strands is always canceled. A layer thickness compensation is therefore possible only in the individual color strands and the known over-coloration after pressure interruptions only conditionally available.

Due to the different arrangement of the two working cylinder 14,15 from the pivot point of the control shaft 13 is a lifting of the intermediate rollers 9; 9 'without strand divider roller 5 and the other with strand divider roller 5 at constantly the same stroke of the working cylinder 14; 15 reached.

This measure contributes significantly to the simplification of the control for the individual switching operations.

In the pressure interruption state, the fourth working cylinder 25 is actuated at the same time, causing the applicator roller stop curve 24 to pivot and causing the applicator rollers 7 to T " to stop.

With pressure continuation of the second working cylinder 15 goes to the position 0, the first working cylinder 14 according to choice of the roller assembly in position 0 or 1 and the fourth working cylinder 25 in position "without pressure".

If now the inking unit to be cleaned, the third working cylinder 23 is actuated, whereby the washing trough 19 is set with doctor 20 to the third distribution cylinder 11. The adjusting screw 21 is used for precise adjustment of the washing trough 19th

At the same time, washing liquid is sprayed into the inking unit and the ink-detergent emulsion is doctored off from the distribution cylinder 11.

This process can be carried out with "rolling on" - with pressure plate clamped on plate cylinder 8 or with "rolling off" - without pressure plate washing.

By different control of the four working cylinder 14; 15; 23 and 25, the following combinations can be achieved in the simplest manner without complicated electrical controls.

working cylinder 14 15 23 25 Print interruption (stopper) To wash 0 , 0 L 0 or L Print interruption (stopper) enter 0 0 0 L automatic 0 0 0 l 0 0 0 l Automatic with compensation group L 0 0 l 0 0 0 l

0 corresponds to working cylinder without pressure and L working cylinder with pressure.

Claims (2)

claims: 1. Switching device for inking rollers in printing machines, wherein the application rollers, the intermediate rollers, a strand divider roller and a pivotable washing trough with doctor blade is provided with a roller adjusting device, characterized in that the intermediate rollers (9, 9 ') with the strand divider roller (5), the washing trough (19) are associated with doctor blade (20) and the applicator roll stop curve (24) separate working cylinder (14; 15; 23; 25). 2- switching device according to item 1, characterized in that the first and second working cylinder (14; 15) are arranged at different distances from the pivot point of the angle lever (12).