DE2602592A1 - ARRANGEMENT FOR CLAMPING A PRE-ASSEMBLED PRINTING PLATE ON A PRINTING MACHINE - Google Patents

Description

Pstentonvvjslt

DlpMng. K. WaSther

U 04 4Ä £ «

W / Vh-3139 1/22/76

Giuliano Cigna, manufacturer, Via Adamello 40,

Turin / Italy

Arrangement for tensioning a preassembled printing plate on a printing machine

The invention relates to an arrangement for tensioning a preassembled printing plate fixed with one edge along a surface line of the printing cylinder of a printing machine on this fixed preassembled printing plate by means of a rubber band and aims to keep the preassembled printing plates under a suitable tension during printing. _;

Pre-assembled pressure plates are made of plastic *

panels of fabric to which rubber types are attached. These wise along one edge of a profile for hooking onto the printing cylinder of the printing machine, while the parallel edge of the,

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Printing plate by adhesive tapes or in high-speed printing machine by j tensioned rubber bands at the platen ^anlie-: is kept quietly.

The rubber bands used hitherto for this purpose v / iron at one end one for fastening in a corresponding one Slot of the pressure roller serving hook and at the other end a flexible tab, which is in a next to the The hole provided with an eyelet is placed on the edge of the preassembled pressure plate and then bent around the rubber band to be firmly connected to the pressure plate. The flap must be bent sharply to avoid protrusions that could damage the print to avoid. The flap is therefore usually compressed so that it breaks and after just a few uses must be thrown away. This represents a considerable effort. Further disadvantages of this known arrangement are the relatively long time for attaching the elastic bands and compressing the flaps and the possibility of that during the printing work loosens the rubber band or breaks its flap, causing rejects or other damage.

The invention is based on the object of designing an arrangement of the type mentioned at the outset so that the Fastening and tensioning the pressure plates in a particularly j

easily and quickly executable operation can be done that ι

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the secure hold of the pressure plate during printing is guaranteed and that there is little wear and tear and thus long-term and economical operation can be achieved.

This object is achieved according to the invention in that at one end of the rubber band a hook for insertion is provided in a slot of the printing roller of the printing machine and at the opposite end a plate with an elongated hole is arranged with an extension, and that the pressure plate is in the vicinity of the edge parallel to the defined edge Fastening parts for the immediate detachable connection with the elongated hole each have a rubber band.

In a preferred embodiment it is provided that the fastening parts on the pressure plate are eyelets provided with a circumferential groove. Here it is advantageous if the diameter of the widening of the elongated hole is larger than the outer diameter of the ÖUee and that the smallest width of the elongated hole is smaller than the outer diameter of the eyelet, but larger than the inner diameter of the circumferential groove.

The eyelet expediently consists of a first part with a head and one that is contained at the free end of a recess Shank and a second annular part containing the circumferential groove j, the second part being attached to the shaft of the j first part can be pushed on with the interposition of the pressure plate

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and both parts compressed together with clamping of the pressure plate are. Finally, it is advantageous if the hook and the plate containing the elongated hole are vulcanized of the rubber band embedded in this v / earth and contain holes in which the material of the rubber band acts as a latch entry.

An exemplary embodiment of the invention is shown in the drawing. Show in the drawing

Fig. 1 is a front view of a preassembled pressure plate with an arrangement for tensioning is provided according to the invention, Fig. 2 is a side view of Fig. 1, Fig. 3 is a partial side view of essential parts of the printing plate on an enlarged scale, FIG. 4 is a schematic side view of a printing roller a printing machine and a preassembled printing plate immediately before they are attached to the printing roller, Fig. 5 is a front view of a circumferential groove

provided eyelet,

6 and 7 are cross-sections through an eyelet formed from two parts according to FIG. 5 before they are combined; gung,;

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Fig. O is a front view of a rubber band according to the invention on an enlarged scale and

FIG. 9 is a side view of FIG. 8.

A printing plate 1 made of a flexible plastic, e.g. a plastopole, has rubber types 2 in itself equipped in a known way. The printing plate 1 is provided in the usual way on one edge with a profile 3, which the Attachment to a printing roller 5 of a printing machine is used. For this purpose, a fastening member 4 is provided along the surface line of the pressure roller, which can be designed in various ways. The pressure roller 5 also has inclined slots 6 in a manner known per se, which for receiving hooks of a Clamping device are determined.

The pressure plate 1 is prepared by placing near its edge parallel to the edge supporting the profile 3 a plurality of eyelets 7 is attached corresponding to the number of tensioning straps to be provided. Each of these eyelets 7 consists of a first, with a head 8 and a recess 10 (Fig. 7) provided at its free end shaft 9 and from a second part 11, which has a circumferential groove 12. To attach of the eyelets is the printing plate 1 by means of a punch of an eyelet machine punched in the hole of the shaft 9 of the first part

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an eyelet (Fig. 7) is inserted and then placed on the shaft 9, the second part of the eyelet 11 and the shaft 9 in the area the recess 10 compressed by means of the eyelet machine, so that v / earth the two parts of the eyelet 7 firmly connected to one another and clamp the pressure plate 1 between them, as shown in FIG Fig. 3 is shown.

The elastic part of the tensioning device comprises an elastic rubber band 13 of suitable length. In general Sets of different lengths are provided so that the appropriate length can be selected in each case. On the one At the end of the rubber band 13 a hook 14 is arranged, which is inserted into one of the inclined slots 6 of the printing roller 5 of the printing machine intervenes. At the opposite end of the rubber band 13, a flat or slightly curved plate 15 is attached, which a Contains elongated hole 16 which has an enlargement 17 in the direction of the inner end of the plate 15. The diameter of this Enlargement 17 is larger than the diameter of the part 11 ^ the eyelet 7 provided with the circumferential groove 12, while the smallest Width of the elongated hole 16 is greater than the inner diameter of the circumferential groove 12, but smaller than the outer diameter of the Eyelet 7. As a result of this arrangement, the rubber band 13 can be attached directly to an eyelet 7, as shown in FIG is, and remains firmly and securely connected to the eyelet.

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After hooking the preassembled pressure plate 1 along its Profile 3 on the printing roller of the printing machine, the rubber bands 13 connected to it are made in a manner known per se.

ii tensioned and hooked by means of the hooks 14 to slots / the pressure roller. During this process, there is no deformation of the metal parts of the clamping devices, which are therefore not spoiled and can be used again as desired.

It is clear that by an equally quick and easy process, the rubber bands 13 at the end of the printing work can be removed from the preassembled printing unit.

The hook 14 and the if ^ ltte 15 containing the elongated hole 16 can be attached to the rubber band 13 on any suitable Way to be attached. However, it is particularly advantageous to have the hook 14 and the plate 15 with some locking to provide lightening holes 18 and then during the vulcanization of the rubber band 13 in this with these parts to embed.

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Claims (1)

-8 claims 1.) Arrangement for tensioning one with an edge along a manfelline of the printing roller of a printing machine this fixed pre-assembled pressure plate by means of a Rubber band, characterized in that at one end of the rubber band (3,3) a hook (l4) is provided for insertion into a slot (6) of the printing roller (5) of the printing machine and at the opposite end a plate (15) with an elongated hole (16) with an extension (17) is arranged, and that the pressure plate (1) is in the vicinity the edge parallel to the fixed edge fastening parts (7) for the immediate detachable connection with the elongated hole each having a rubber band. 2. Arrangement according to claim 1, characterized in that the fastening parts (7) on the pressure plate (1) are provided with a circumferential groove (12) eyelets. 3ο arrangement according to claim 1 and 2, characterized characterized in that the diameter of the enlargement (17) of the elongated hole (16) is larger than the outer diameter of the eyelet (7) and that the smallest width (16) of the elongated hole is smaller than the outer diameter of the eyelet, but larger than the inner diameter the circumferential groove (12). -9- 609837/0648 4. Arrangement according to claim 1 to 3, characterized in that the eyelet (7) consists of a first part with a head (8) and a shaft (9) contained at the free end of a recess (10) and a second annular which Circumferential groove (12) containing part (11), and the second Part can be pushed onto the shaft of the first part with the interposition of the pressure plate (l) and both parts are clamped the pressure plate are compressed. 5. Arrangement according to claim 1 to 4, characterized characterized in that the hook (14) and the plate (15) containing the elongated hole (16) during vulcanization of the rubber band (13) are embedded in this and contain holes (18) into which the material of the rubber band enters as a latch. 609837/0648