DD286331A5 - ADJUSTMENT DEVICE FOR GRINDING ROLLERS - Google Patents

Abstract

The invention relates to an adjusting device for friction rollers in printing presses for adjusting Verreibhub and Verreibeinsatz during the cycle of the machine. The object of the invention is to provide a setting device for friction rollers, whereby an automatic adjustment of the Verreibhubes, and independently of the adjustment of the Verreibeinsatzes, for each distribution cylinder can be performed separately during machine operation. Erfindungsgemaesz the object is achieved by the fact that a movable in two directions servomotor via a spur gear and two freewheel coupled drive wheels each connected to downstream separate gear for Verreibhub- and employment adjustment of a friction roller. Fig. 1 {Printing Machine; Plate cylinder; friction roller; Transmission; Verreibhub; Phasing}

Description

For this 2 pages drawings

Field of application of the invention

The invention relates to an adjustment device for friction rollers in printing presses for adjusting Verreibhub and Verreibeinsatz during machine operation.

Characteristic of the known state of the art

For most inking units, the color is continuously or discontinuously relatively evenly from the ink fountain into the inking unit, i. H. on the ink rollers, promoted. The decrease in color through the paper is uneven, especially in bogon printing machines. The cause is the cylinder channels, in the area of which there is no ink acceptance, as well as a uniform distribution over the entire printing length. This difference between ink feed and color decrease causes color density fluctuations that adversely affect print quality. An essential means of eliminating these color density fluctuations is the lateral trituration of the Reiber, which perform an iridescent motion in addition to their rotational movement. According to recent findings, the size of the Farbverreibhubes of importance for the formation of pressure disturbances in the form of color stencils or ghost images. Due to the subject, it is advantageous to vary the size of the Farbverreibhubes to eliminate the stenciling. From DE-OS 2228939 a device for axial trituration has become known, in which by means of a transmission member, the phase position of the Verroibbewegung of two respective friction with respect to the rotational movement of the plate cylinder during machine operation is adjustable. The disadvantage of this device consists in the mutual influence of the Reiber, as always creates a constant stroke or phase offset by the connection of both reporters on roller lever.

Another device for axial trituration, in which each driver has its own drive for the axial Verreibbewegung and the trituration both in their stroke and independently in their phase position is adjustable, discloses the US-PS 3345941.

Apart from the fact that the benefits of this device only come into full effect when each rubbing roller is assigned only an applicator roll, bosteht the main disadvantage is that a lifting or Verreibeinsatzverstellung requires opening the side wall to adjust the eccentric manually parked machine to be able to, which is the negative impact of the increasing automation process on the Druckmas;

Object of the invention

The aim of the invention is to provide a setting device for friction rollers, which contributes to the improvement of the quality of coloring and increasing the print quality.

Explanation of the essence of the invention

The object of the invention is clor creation of a setting device for friction rollers, with an automatic adjustment de; Verreibhubes, and regardless of the adjustment dos Verreibeinsatzes, for each distribution cylinder can be performed separately at Masch'inenlajf.

According to the invention, the object is achieved in that a movable in two directions servomotor is connected via a spur gear and two freewheel coupled drive wheels each with downstream separate gear for Verreibhub- and pitch adjustment of a friction roller.

Dc3 gear for adjusting the Verreibhubes is designed as a coupling gear with Gesteilpunktverlagerung and the transmission for adjusting the Verreibeinsatzes as epicyclic gear, each gear are assigned self-locking worm gear. The rotor of the servomotor is connected via a coupling with a handwheel.

-2- 286 331 Ausfühningsbolsplel The invention will be explained below using an exemplary embodiment. In the accompanying drawing show

Fig. 1: schematic representation of the adjusting device 2: side view according to FIG. 1 Fig. 3: Walzenschcma an inking unit part The invention assumes that a plate cylinder 1 four inking rollers are assigned, with two each Ink application rollers with a rubbing roller 2 or 2 'cooperate. Hereinafter, only one system inking rollers Reibwaben2

described, since the adjustment of the second system inking roller friction rollers 2 'is analog.

1, a gear 3 is fixed on the leg of the plate cylinder 1, which with a double-sized crank wheel 4th

engaged. The crank wheel 4 corresponds to a fostsetzbaren planetary gear 13, consisting ius sun gear 5,

Umlaufräder β, 8 and a web, which is designed as a worm wheel 7. The worm wheel 7 operates with the worm 10

together. The planetary gear 8 is in meshing engagement with a second crank wheel 9, which with a coupling 14 and a

Swingarm 16 forms a four-bar linkage. At this four-bar linkage, a two-bladed, consisting of a fork lever 15 and an angle lever 23, respectively. The six-link coupling gear 17 for transmitting the Verreibhubbewegung from the second crank 9 to the rubbing roller 2 is

designed so that the frame point of the first four-bar linkage 9,14,16 is displaced.

This is done by another four-bar linkage consisting ius the segment 18, the coupling 19 and a second Worm wheel 20 designed crank wheel. The second worm wheel 20 is fixed by the second worm 21. The Screws 10 and 21 carry on their axis drive wheels 27,28 which are connected to couplings, which in this Embodiment designed as freewheels 11,22. The drive wheels 27,28 are coupled via a spur gear 12 with a movable in two directions of rotation servomotor 24. The freewheels 11,22 are connected so that the connection to the worm 10,21 alternately in left or right of the Actuator 24 is made. The function of the color trimming and adjustment of the stroke and the phase position is as follows. The axial Verraibung is initiated by the half-turn crank movement of the second crank 9. This movement will

transmitted via the six-membered linkage 9,14,18,15,19,23 on the friction roller 2. The change of the Verreibhubes takes place via the frame point displacement of the four-bar mechanism 9,14,16,13,19 by means of the screw 21st

The change in the Verreibeinsatzes done by land circulation of the epicyclic gear 13 by turning the Worm wheel 7 and the worm 10. The possible over the two screws 10,21 possible self-locking adjustment of Verreibhub · and use starting from Spur gear 12 via the drive wheels 27,28 with the freewheels 11,22 is purely manual and motor possible. For this purpose, the movable in two directions servomotor 24 is either directly or via a gear stage with the spur gear 12th

connected. The control of the servomotor 24 is carried out by the central control panel. About a clutch 25, the rotor of the

Actuator 24 with a handwheel 26 connectable. Now, if the servo motor 24 is operated in the clockwise direction, there is a decoupling of the second freewheel 22 and a blocking of Freewheel 11, whereby the Schnacke 10 is rotated and pulls a Verreibeinsatzvorstellung the friction roller 2 by itself. Accordingly, in the creep of the servo motor 24, the decoupling of the freewheel 11 and consequently the blocking of the

second freewheel 22, which has a Verreibhubverstellung the distributor rollers 2 result. Through this exploitation of the two

Direction of rotation of a servomotor 24 in conjunction with the freewheels 11,22 is the adjustment of the Verreibhubs and the Verreibeinsatzes a rubbing roller 2 automatically or manually achieved easily with an actuating means. Was a certain setpoint for lifting or use run over, the servomotor 22 must be a further scarce 360 degrees in the

the same direction of rotation to realize the desired value. This fact arises once from the self-locking worm gears 7,10 and 20,21, but have the great advantage that a certain attitude not with screws o. Ä. Must be fixed and on the other hand, the function-related freewheels 11,22.

Claims (3)

1. adjusting device for friction rollers in printing presses for adjusting Verreibhi b and Verreibeinsatz during the machine run, wherein each rubbing roller two inking rollers are assigned, characterized in that a movable in two directions servomotor (24) via a spur gear (12) and two with freewheels ( 11) and (22) coupled drive wheels (27.28) are each connected to downstream separate gears for Verreibhub- and employment adjustment of a friction roller (2). 2. Adjusting device according to claim!, Characterized in that the transmission for adjusting the Verreibhubes as coupling gear (17) with frame point shift and the transmission for adjusting the Verreibeinsatzes as epicyclic gear (13) is formed, each gear (17,13) self-locking worm gear ( 7,10) and (20,21) are assigned. 3. Adjusting device according to claim 1, characterized in that the rotor of the servomotor (24) via a coupling (25) with a handwheel (26) is connected.