DE1985004U - PUNCHING DEVICE FOR PLATES MADE OF ZINC PLATE OR PLASTIC-COATED SHEET, WHICH ARE USED AS PRINTING FORMS. - Google Patents

Description

24- »November 1% 7 F / Ga.

Bruno Unser, 5407 Boppard / Ehein, Mühltal

Punching device for plates made of zinc sheet or plastic-coated sheet, which are used as printing forms to serve

The! Price increase concerns a device for punching as Printing forms to be used plates made of zinc sheet or plastic-coated sheet metal or similar plates, which are used as printing forms, e.g. for the high offset printing process »

Such plates to be clamped onto a plate cylinder have tongues on opposite edges which each a mounting hole included »The tongues on one edge of one panel are against the tongues of the opposite Edge offset in such a way that at the joint of two panels the. Tongues of a plate in the gap between the tongues of the abutting plate fit »Both plates can be adjusted using the tongues containing the fastening holes slip over a row of pens arranged in the plate cylinder.

One has the edges of the plates with the tongues previously made by cutting by hand with tin snips »This" process is time-consuming and does not lead always to completely flawless work results »

Attempts have therefore already been made to produce the edges of the plates with tongues in a punching device » Since the material of the plates, zinc sheet, can easily be plastically deformed and tends to form burrs, is one safe holding down of the sheets when opening the punching device required, for which purpose a rubber plate inserted into the device was used »With this rubber plate however, satisfactory results could not be achieved. Ss deformations occurred when opening the "device of the plates on ... 'which impaired or made impossible their use for printing.' this known punching device has the Eachteil that it can only be used in conjunction with a punching machine. The top of the punching device is in one vertically movable part of the punching machine, which carries out the opening and closing movements »

A punching device is to be created by the increase in price with the without a special punching machine and without the Risk of deformation of the zinc sheets or the like Printing forms are to be used, are punched can"

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The new punching device for plates made of zinc sheet or plastic-coated sheet metal or similar plates, which serve as printing forms, and those from the upper part and The lower part is, according to the hiring, characterized in that the upper part and the lower part of the punching device attacking leathers are provided in or on the device, which after discontinuation of the on the punching device acting closing force strive to lift the upper part against the lower part of the door direction =.

For example, compression springs can be arranged in the punching device lying «When the upper part is placed on the lower part, the upper part is supported on the compression springs, the length of which is dimensioned so that a gap still remains »The punching device can now under one of the in the manufacturing plant from the usual presses for printing forms »by going down the upper punch of such a Press, the punching device is closed against the force of the compression springs, with the punching cut being carried out will. As soon as the upper punch of the press is moved upwards and releases the upper part of the punching device, if this is lifted upwards under the force of the compression springs »The compression springs are mostly made of metal Formed helical wedge springs. However, other compression spring elements, e.g. «B» from (Jummi, can be used »

This new punching device can also be used in conjunction with a rubber insert; however it is because of To the unfavorable experiences with such insoles, it is preferable to use a spring-mounted hold-down device in the upper part to provide, the limits of which are in immediate laughability - the S tanz cuts run, these of the S without idl contour Adapted hold-down devices prevent deformation of the sheets to be punched and the sheets from getting stuck when opening the punching device »

In the drawing, from the further details of the furnace emerge is a detailed example of the furnace, shown <. It shows:

Fig. 1 is a plan view of auj? the bottom of the top and

]? ig, 2 a top view a ^^ f the top (inside) facing surface of the lower part of the punching device;

. ! ig »3 (this and the following figures in a larger Scale as Fig «1 and 2) a plan view ■ - excerpts - on the lower part of the punching device and

Fig. M- to 6 each a section - in part -

through the upper part and the lower part of the

Punching device for illustration of details »

The sheet metal to be punched, the pressure plate 1, is placed on the lower part 3 of the punching device (see S ^{1 Ig. 2). In the upper part 2 (see FIG} Die cut the serrations and holes on the hand of the pressure plate 1 or «punch»

In I? Igo 3 - on a larger scale than I ¹ Xg-. 1 and 2, a horizontal section through the toothed punch 10 and the sound punch 5 is illustrated «

The hold-down device 7 (see Fig. 1, 3? 4 and 5) is used in Opening of the punching device, that is, when the upper part 2 is lifted off, by the compression spring 8 (see FIG. 4) on the Pressure plate 1 held until the upper part 1 and with it the punching tools 4, 5 are at least so far raised that the punching tools cut the edges of the plate 1 do not touch any more «. The movement of the hold-down 7 is in relation to the upper part 2 by the retaining bolt 9, its S stick through a hole of the appropriate diameter is guided in the hold-down device and the head of which is a stop for the hold-down device at its ¥ eg downwards, poses, limited.

To open the mold, compression springs 10 (cf. Fig. 6) are provided, one end of which is against the upper surface of the lower part 3 and the other end against which is firmly connected to the upper part 2. Guide bush ΛΛ touch «,

- 6

Me guideline 11 liat on the one facing the pen 10 Side a Bingnut corresponding to the I? Edera "bmesstingen» The im. The bolt 12 attached to the lower part J ″ lies in the compression spring 10 and protrudes into the bore of the guide bush 11 »

Claims (2)

RA.67.3 003 * 2 /. ti. Protection claims ο Punching device for plates made of zinc sheet or plastic-coated Sheet metal or similar plates, which are used as printing forms, and which consist of the upper part and the lower part consists, characterized in that on the upper part (2) and on the lower part (3) of the punching device engaging leathers (10) are provided in or on the device, which after the discontinuation of the acting on the punching device Closing force strive to lift the upper part (2) against the lower part (3) of the device. 2. punching device "according to claim 1, characterized in that in the upper part (2) supported against springs (8) Restrainers (7) are attached, their limits run in the immediate vicinity of the die cuts « 3 »punching device according to claim 2, characterized by Stops (9) for the downward movement of the hold-down devices (7) «