DE419150C - Method and device for attaching the rubber blanket to the transfer cylinder of rubber printing machines - Google Patents

Description

GERMAN EMPIRE

ISSUED ON SEPTEMBER 28, 1925

REICH PATENT OFFICE

PATENT LETTERING

CLASS 15 d GROUP (G 62400 'XUjisd)

Emil Gerasch G. m. B. H. in Leipzig.

Method and device for fastening the rubber blanket on the transfer cylinder of rubber printing machines.

Patented in the German Empire on October 11, 1924.

In the method of producing rubber prints using a rubber printing machine is one or both of the cylinders, between which the sheet passes for the purpose of printing, with a rubber blanket strung. The tensioning of the rubber blanket takes place in such a way that in the direction the circumference of the transfer cylinder, the cloth is pulled taut. By mooring the edge or the inner edges of the rubber

tuch.es the same is secured in this tension position on the circumference of the cylinder. Even if only one cylinder with

* The rubber blanket is covered, but even more so when both cylinders are covered with a rubber blanket, there is a tendency for wrinkles to form in the sheet to be printed.

Tests have shown that the cause is the lateral movement of the rubber blanket

ίο as a result of the pressure between the cylinders lies; namely, the cloth moves laterally inwards. The moving printing paper is brought into a superimposed position, and thus distorted the formation of wrinkles.

This problem known in the art of rubber printing, which is probably due to high tension of the rubber blanket, but especially when there are two cylinders covered with rubber press against each other, cannot be eliminated, has led to the present invention out, shown in one embodiment in Figs. 1 and 2 of the drawing is.

The invention consists in the fact that the blanket not only, as previously usual, in the Direction of the circumference of the transition cylinder, but is stretched taut on all sides. This tight tension on all sides is achieved by the lateral edges of the rubber blanket attached to suitable guide pieces prior to tensioning in the direction of the circumference of the cylinder so that the fastening means are movable in this tensioning direction. As a result of this yielding in the direction of the circumference of the cylinder Clamping the side edges of the blanket can prevent this from expanding of the blanket when tensioning in

Fig.i.

follow the direction of the circumference, but the flexibility in the transverse directions is excluded. The consequence of this is that a taut tension on all sides of the rubber blanket is automatically achieved when the same is pulled taut in the direction of the circumference. The Fühlungsstücke that räsung by precipitation and knockout, the edges of the cylinder can be made, or of the annular side parts, so far recessed that the cylinders of the cooperating with this cylinder, etc. not damaged by the securing means of the blanket to the transfer 5a will.

Claims (2)

Patent Claims: 1. Procedure for attaching the blanket to the transfer cylinder of Rubber printing machines, characterized in that the rubber blanket not only at the ends, but also at both Pages is stretched taut on the transfer cylinder. 2. Device 'for performing the method according to claim 1, characterized in that that on both sides of the surface of the transfer cylinder to be covered by the blanket, guide pieces are arranged are on which are used to hold the side edges of the blanket, in movable brackets are fixed in the direction of the circumference of the cylinder, so 70 that when tensioning the rubber blanket in the circumferential direction of the cylinder, the lateral The edges of the blanket are held in place by the clamps, which means that the blanket is taut on all sides will. Fig. 2.