EP0303208A2 - Device for closing the gap between the ends of an intaglio plate attached to a form cylinder - Google Patents

Abstract

Device for closing the gap between the ends of an intaglio printing plate (3) mounted on a forme cylinder (1), with a plate (6) covering the gap (5) and devices for filling the gap cavity with plastic and hardenable material, consisting of two shaped pieces ( 7) - which are inserted onto the shaft ends of the forme cylinder -, and a profile (8) firmly connected to the shaped pieces, into which two movable pressure bars (9) are incorporated, with several pressure screws distributed over the length of the pressure bars ( 10) are arranged.

Description

The invention relates to a device for closing the gap between the ends of a gravure plate clamped on a forme cylinder, with a plate covering the gap and devices for filling the gap cavity with plastic and hardenable material, consisting of two shaped pieces - which are inserted onto the shaft ends of the forme cylinder -, A profile firmly connected to the fittings, in which two movable pressure strips are incorporated.

It is known to clamp gravure printing plates, consisting of a dimensionally stable and flexible support and a cover layer applied thereon, onto a forme cylinder of a sheet-fed or rotary printing machine. For this purpose, the forme cylinder is provided with a groove running parallel or also obliquely to the forme cylinder axis, into which the intaglio printing plate is hung and held at an acute angle with bent ends. The resulting gap between the two ends of the rotogravure plate is closed with a plastic compound. For this purpose, a flowable and curable mass is filled into the gap after it has been covered beforehand by a flat piece, for example a plate covering the gap, by means of a pressure piece (see DE-A 3 08 807).

In the further development of the above devices, the pressure piece was replaced by two bending rulers, the same having to be designed to be extremely rigid in order to prevent the bending strips from being partially lifted when the plastic compound was injected. This has the consequence that plastic mass is pressed out from under the plate (see DE-A 34 01 501).

All of the above devices have the disadvantage that they are very heavy and also difficult to handle. Furthermore, the conversion to different cylinder diameters is not flexible enough with these devices. Ultimately, even with the above-mentioned bending rulers, it was not possible to prevent them from deflecting when the plastic compound was injected.

It was therefore the task of developing a device for closing the gap between the ends of a gravure plate clamped on a forme cylinder, which has a significantly lower weight, so that the same ge in smaller printing units by one person can be handled. Furthermore, it should be possible to close the gap on the forme cylinder transport carriage or in the printing press itself, and to prevent deflection of the bending rulers.

This object is achieved in that a plurality of pressure screws distributed over the length of the pressure bars are arranged above the pressure bars.

For a better understanding of the invention, an embodiment is described below with reference to the drawing:

• Figur 1 den Formzylinder mit aufgespannter Tiefdruckplatte und der erfindungsgemäßen Vorrichtung zum Verschließen des Spaltes im Querschnitt,
• Figur 2 den Formzylinder wie Figur 1, jedoch im Längsschnitt.

Show it

• FIG. 1 the cross-section of the forme cylinder with a rotogravure plate and the device according to the invention for closing the gap,
• Figure 2 shows the forme cylinder as Figure 1, but in longitudinal section.

As can be seen in FIGS. 1 and 2, the forme cylinder 1 of a sheet-fed or rotary rotogravure printing machine is provided with a groove 2 which runs along the forme cylinder axis and widens from the cylinder surface to the cylinder center, into which the intaglio printing plate 3 with the two is clamped folded ends 4 is hooked at an acute angle. To close the gap 5 between the two ends, a plate 6 is placed over the two end sections of the intaglio printing plate, which is elastically bendable or shaped according to the contour of the cylinder surface. The device according to the invention is used to press the plate, the construction of which is described below.

Between the two shaped pieces 7, which are inserted into the shaft ends of the forme cylinder, there is a profile 8 firmly connected to the shaped piece, into which movably arranged pressure strips 9 are incorporated, which are adjustable in the direction of the forme cylinder. In addition, in these profiles - aligned with the pressure bars - several pressure screws 10 are incorporated, by means of which the pressure bars can be pressed against the plate over their entire length with high force, so that contact between the plate and gravure plate is provided on both sides of the gap over the entire length of the cylinder consists. This ensures that when the plastic mass is injected it cannot flow out between missing contact points between the plate and the gravure plate.

Claims (1)

Device for closing the gap between the ends of an intaglio printing plate (3) mounted on a forme cylinder (1), with a plate (6) covering the gap (5) and devices for filling the gap cavity with plastic and hardenable material, consisting of two shaped pieces ( 7) - which are inserted on the shaft ends of the forme cylinder -, a profile (8) which is firmly connected to the shaped pieces and into which two movable pressure bars (9) are incorporated, characterized in that several are distributed over the length of the pressure bars over the pressure bars Pressure screws (10) are arranged.

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