DD223117A1 - SWITCHING DEVICE FOR A COMBINED HUMIDITY AND PAINTING WORK - Google Patents

Abstract

The invention relates to a switching device for a combined dampening and coating in sheetfed offset printing presses. The task of creating a switching device for a combined wet and varnishing, which maintains both the wet operation, the favorable effect on the printing process pre-moistening the dampening roller, as well as in Lackierbetrieb prevents sticking of the varnish applicator roller is achieved, that below a double lever of the Switching device is a changeover switch for wet and Lackierbetrieb arranged in the form of an adjustable eccentric.

Description

YEB Combine Polygraph

"Werner Lamber" Leipzig.

7050 Leipzig Leipzig, 27.03.1984

, title

Switching device for a combined dampening and coating unit

field of use

The invention relates to a switching device for a combined wet and varnish in sheet-fed offset printing presses.

Characteristic of the known technical solutions

In recent years, the technical question of high-grade printed products has been getting bigger, d. H. The printing industry was faced with the task of providing the printed products with a glossy, abrasion-resistant coating. For reasons of effectiveness, it is proposed for this reason, in DE-PS 2020854, to use the dampening unit of the last printing unit as a coating unit. As a result, the printed sheet can be printed with paint and painted in a print run. ..

ο _Λ , η

Since painting is not necessary for every print job, there is a requirement that dampening units of the last printing works should be used either as a varnishing unit or as a dampening unit. Corresponding to the respective operating state, different switching variants, the application roller, must be realized especially in the event of pressure stoppages (eg stop stoppers). In damp as in Lackie'rbetrieb a Walzentrennung between the applicator roll and the plate cylinder is made to once to suppress the dampening solution or paint supply and prevent the other roll flattening by the pressure. Clay of the last appearance "would be affected in particular the application roller, since it is covered with an elastic material ·." -. , For these reasons, in wet operation at pressure interruption, the roller separation is such that the applicator roller is separated from the plate cylinder as well as from the transfer roller. ''. ''. /, '' -

When printing continuation Auftragwalzenansteliung carried out according to DE-AS 1611263 such that the applicator roll first with the transfer roller to achieve the for the printing process, favorable ^: pre-moistening the applicator roll and is then brought into contact with the plate cylinder. This Zustel-be-, movement via a complicated gear with high manual effort in the adjustment of the applicator roll relative to the transfer roller 'and the plate cylinder. , For the paint shop, this switching option is the, applicator roll bei.Druckunterbrechung unfavorable because a -Verkleben the paint application roller with the distribution roller arranged on it would occur through the Eestlackschicht. .

For this reason, in the.M.Ä.I. Holand Nachrichten 44 proposed at a coating plant, off the applicator roll during print interruptions only / from the plate cylinder. The body contact applicator roller transfer roller is maintained, with the transfer roller driven by the platen roller and thus also the applicator roller at auxiliary speed. becomes. , Sin Drying of the residual coating layer is thus avoided because a roller connection to the paint reservoir upright

will hold. By means of which this switching possibility is to be realized is described in the prospectus of dar M.A.N. EoIand not shown.

Object of the invention

i ......

The aim of the invention is to provide a switching device for a combined dampening and coating, wherein the conversion of moisture · on painting done with the necessary switching capabilities of the applicator roll with simple means · _ '· _'

Object of the invention. , ·

The object of the invention is to provide a switching device for a combined moisturizing and coating unit which, in damp operation, which maintains the pre-moistening of the dampening form roller, which has a favorable effect on the printing process, also prevents the varnish application roller from sticking together in the varnishing operation.

Embodiment.

The invention will be explained in more detail with reference to an embodiment. ,

'*

The accompanying drawing shows the basic structure of the switching device. .. ·

According to the known dampening structures a fountain roller 1 is arranged so that its surface with the liquid contained in the fountain solution 2 in body contact

stands .- 'almost vertically above the fountain roller 1, a transfer roller 3, the surface is chrome-plated arranged. As Yerbindungswalze between the transfer roller 3 and ^a: plate cylinder 4 is an elastically coated application roller 5 serves ·

The further description is limited to a roll end 6, since the execution of the other roll end is the same in every way. ..... '. At the end of the whale ^{1, a} swiveling lever 7 is rotatable: fixed, which is connected by means of a compression spring 8 and a rod 9 to a double lever 10 mounted on the stub shaft of the transfer roller 3. The swiveling lever 7 is also in FIG Attachment point 11 movably arranged on the coupling lever 10 · Also on the pivot lever, 7 ist.ein transmission element 12, which with a working cylinder 13 »as a two-position cylinder; is formed, fastened ». In the double lever 10 is a first adjusting screw 14 and a second Sins te lischraube: '15 screwed. Both screws are provided with scaling (not shown). The first adjusting screw 14 is supported against the frame and the second lins partial screw 15 against the pivot lever 7 from. Below the free end of the double lever 10, an eccentric 16 is rotatably mounted in the machine frame. Via an output element 17 and a coupling rod 18 is, t -der. Eccentric 16 with a hydraulic cylinder .19 »which is mounted in the machine frame connected. The hydraulic cylinder is in the two. Positions I and II movable.

above the applicator roller 5 is an inking roller 21, which can be brought via a switchable intermediate roller 22 with the applicator roller 5 in connection.

The effect is the following: '...' ..

First, the operation of the switching device for the

described wet process. _v .

, For this reason, the hydraulic cylinder 19 is moved into the position _: I, as a result of which the eccentric 16 moves into the continuous position via the coupling rod 18 and the output element 17

becomes. '

By the rotational movement of the dampening agent tank 2 a _r diving fountain roller 1, which is carried by a not shown adjustable electric motor, the dampening fluid is /, the transfer roller 3 and the applicator roll 3 transferred onto the clamped on the plate cylinder 4 printing plate. In order to avoid that at longer pressure interruption over the intermediate roller 22 switched to inking Verreibwalze dampening agent enters the inking unit and between applicator roller 5 and transfer roller 3, a deformation of the roller surface, the applicator roller 5 must be turned off the plate cylinder 4- and the transfer roller 3 · For this purpose, the piston of the working cylinder 13 is by means of compressed air. moves the position b, whereby the dampening roller 3 is pivoted on the transfer roller 3 . In this case, the pivot lever 7 and the double lever 10 is moved together about the pivot point of the transfer roller 3 to the frame-fixed eccentric 16, which is in the solid position. As a result, the dampening roller 3 is lifted off the transfer roller 3 . Der.Doppelhebel 10 remains in its already occupied position, adjacent to the eccentric 16. Only the pivot lever 7 is rotated in the attachment point 11, wherein the path difference is absorbed by the spring suppression of the spring 8. When starting the machine takes place: the movement of the application roller 5 in reverse order.

Before pivoting the working cylinder 13 from b to a of the working cylinder 19 is pivoted from I to II. As a result, the eccentric 16 is brought into the dotted position and the application roller 3 3 & the transfer roller 3 is pivoted. As a result, a pre-moistening of the applicator roll 5 is possible as required. After a selectable time of a timer not described in detail between working cylinder 13 and 19, the working cylinder 13 is brought from a to b. The pre-moistened application roller 3 receives body contact with the plate cylinder 4.

By means of the first adjusting screw 14, the pressure of the application roller '5 relative to the plate cylinder 4 and by means of the second adjusting screw 15, the pressure against the transfer roller 3 can be set exactly reproducible. If now the dampening unit is to be used as one of the last printing units as a varnishing unit, the parquetting rollers are first of all parked in a known manner. The hydraulic cylinder 19 is moved to the position II by means of the eccentric 16 the dashed lines Now, the normal Laekierbetrieb can be recorded · If it comes to a normal machine stop, for example by a stopper, so as in / J wet operation of the working cylinder 13 is moved from position a to b * Double lever 10 and pivot lever 7 swing together the center of the transfer drum 3 · this lifts the applicator roller 5 -from plate cylinder 4 and remains in contact with the ¹ transfer roller 3 · the fountain roller 1 is made to an auxiliary speed (here not more closely described) accommodated and remains' ^ m contact with the Thus, the transfer roller 3 · remain over the duration of ¹ Masc'hinen - 'haltes fountain roller 1, transfer drum 3 and the application roller 5 in Kör.perkonta. kt. Sin drying of the paint layer is thus excluded »·. '

_; In a longer machine stop, the. Working cylinder 19 brought into the position I and thus the eccentric 16 pivoted against the lever 10, which ein.Abheben in above, described ._ Way of the application roller 5 on the Übergtragungswalze 3 be 'acts. 'As a result, a flattening of the applicator roll 3 is avoided. · · ...... "."

For the sake of brevity, it should be mentioned that the application roller 5 is not brought out of engagement with the Plattenzylinderantriebsrad in the off state, so that the applicator roll 5 according to the DB-OS 2822350 * ni "k must be equipped of a freewheel to the peripheral speed of To be able to accept the dipping roller 1.

Claims (2)

ErfindungsanspruGh 1. switching device for © in combined dampening and coating, which consists of a fountain roller, a transfer roller and an elastically coated applicator roll, characterized by the fact that below a double lever (10) of the switching device (20) a switch for wet "and Painting operation in the form of an adjustable · eccentric (16) is arranged. 2 * switching device according to item 1, characterized in that the switching device (20) consists of a pivot lever (7) and the double lever (10), which are braced frictionally with each other, wherein the pivot point of the double lever. (10) coaxial with the axis of rotation of the transfer roller (3) and the pivot point of the pivot lever (7) in the double lever (10) is arranged. For this 1 page drawings