DE609099C - Fixing and clamping device for flexible printing plates on the forme cylinder of rotogravure printing machines - Google Patents

Description

GERMAN EMPIRE

ISSUE ALB
FEBRUARY 7, 1935

REICH PATENT OFFICE

PATENT LETTERING

M 609099 CLASS 15 d GROUP 33

Angelo Dagnino in Milan, Italy

of rotogravure printing machines

Patented in the German Empire on March 8, 1931

The invention relates to a fastening and. Clamping device for flexible printing plates on the forme cylinder of rotogravure printing presses, in which the in a longitudinal groove of the forme cylinder pushed in, bent printing plate ends by a movable bar arranged on the circumference of the cylinder be pressed close together.

In the known devices of this type is called. movable bar uses a wedge, by moving the printing plate in the longitudinal direction of the forme cylinder tensions and presses both printing plate ends tightly together. But here is the There is a risk that one end of the printing plate will be displaced in the longitudinal direction of the forme cylinder or is warped.

To avoid this and the clamping movement of the bar only in the circumferential direction To bring the cylinder into effect, the bar around the forme cylinder axis pivotally arranged. The printing plates are not on the part that covers the longitudinal groove of the forme cylinder etched. To now in the forme cylinder an interruption of the support for the printing plate To avoid this, the bar is provided with protrusions or teeth that are in appropriate Engage recesses in the forme cylinder or a bar attached to it in a comb-like manner.

An embodiment of the invention is illustrated in the drawings; put it dar:

Fig. Ι a longitudinal section through the forme cylinder,

Fig. 2 is a plan view,

Fig. 3 · a cross-section along the line III-III of Fig. 2 with unstressed pressure plate,

Fig. 4 shows a cross section along the line IV-IV of Fig. 2,

Fig. S a cross-section of the forme cylinder with a tensioned printing plate,

Fig. 6 is a side view of the device for pivoting the clamping bar,

Fig. 7 is a diagram of the pressure plate.

On each front wall 2. of the hollow forme cylinder body 1 is arranged a hub 3 in which the pivot 4 of the cylinder are stored. The forme cylinder has two elongated recesses 5, one of which to accommodate the bars 6 and 6 'attached to the cylinder and the movable bar 7, while the other means a curved rail 8 is completed.

In the bar 6 attached to the cylinder or in the cylinder wall itself and in the movable bar 7 projections or teeth 9 are arranged, the corresponding in! Recesses of the two strips in a comb-like manner. intervene and guide the moving Bar 7 and serve as a base for the flexible pressure plate. The bar 7 is attached to arms 10, which on the through the trunnions 4 protruding shaft 11 are attached.

At one outer end of the cylinder, the hub 3 or the pin 4 carries a bearing 12 attached to it for two screw spindles 13 running in opposite directions, by means of which the double link 14 attached to the shaft 11 can be adjusted in one direction or the other.
When the nuts sitting on the screw spindles 13 are turned in one direction or the other, the shaft 11 is rotated and the movable bar 7 is pivoted.

When the movable bar 7 is in the position shown in Fig. 3, the bent ends A, B of the printing forme 16 placed around the forme cylinder are inserted into the opening 15 between the bar 6 '

^x and 7 plugged in. By turning the shaft 11 by means of the nuts sitting on the screw spindles, the bar 7 is moved into the position shown in Fig. 5. Since the flanging of the printing plate 16 is dimensioned so that the inside of the curved plate corresponds exactly to the cylinder circumference and should adapt to it completely in the tensioned state (Fig. 5), the printing forme is clamped on the cylinder by the bar 7 which can pivot about the forme cylinder axis . The lead screw device can be provided by any equivalent device, e.g. B. a worm wheel with worm and handwheel can be replaced.

Claims (2)

Patent claims: 1. Fastening and clamping device for flexible printing plates on the. Forme cylinder of rotogravure printing machines, in which the bent printing plate ends pushed into a longitudinal groove of the cylinder are pressed tightly against one another by a movable bar arranged on the cylinder circumference and the part of the printing forme covering the longitudinal groove of the forme cylinder is not etched, characterized in that the movable bar (7) is pivotable about the forme cylinder axis by a rotatable, axially mounted shaft (11) which is pivotable by an adjusting device arranged outside the forme cylinder ¹ » 2. Fastening and clamping device according to claim 1, characterized in that that the movable bar (7) with projections (9) in corresponding recesses of the forme cylinder or a bar (6) attached to it engages in a comb-like manner. For this purpose ι sheet of drawings