DD147079A1 - FORM ROTARY PRINTING PRESS - Google Patents

Abstract

Based on the object to provide a sheet-fed rotary printing machine whose cylinders are designed so that a stoszartige excitation of the cylinder and thereby the generation of vibrations are prevented, the inclination angle of the start-up area at the start of printing is greater than the second inclination angle of the discharge area at the end of printing in the start-up area and in the outlet region opposite standing arranged Mantelflaechen the touching cylinder.

Description

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VEB Combined Polygraph

"Werner Lamberz" Leipzig

705 Leipzig Leipzig, 25.10.1979

Sheet-

field of use

The invention relates to a sheet-fed rotary printing machine,

Characteristic of the known technical solutions

It is known a sheet-fed rotary printing machine, which consists of printing cylinder, Guramizylinder and plate cylinder, are housed in the channel pits clamping elements for mounting the elevators and printing plates. In the start-up and in the outlet area of the channel pits a flat flattening of the cylinder circumference is provided (DE-OS 2 613 688 / B 41F 7/22). The disadvantage here is that no dynamic smoothness can be secured for the cylinder group with the aforementioned design arrival and departure areas, which inevitably leads to Einfärbstörungen in the form of channel edge strip.

The sole elimination of the rubber bead by a corresponding flattening of the cylinder circumference does not prevent the occurrence of vibrations and pressure disturbances, which arise due to the pressure curve at the channel edge.

Object of the invention

The aim of the invention is to provide a sheet-fed rotary printing machine, which avoids a deterioration of the printed products by channel edge strips.

Object of the invention

The invention is based on the Aiafgabe to create a sheet-fed rotary «printing press, the cylinders are designed so that a jerky excitation of the cylinder and thereby the generation of vibrations are prevented.

Essence of the invention

The object of the invention is achieved in that the angle of inclination of the starting area at the beginning of pressure is greater than the second angle of inclination of the outlet area at the end of pressure in the start «and in the outlet region oppositely disposed lateral surfaces of the contacting cylinder, wherein the start-up and the outlet area ein.es Cylinder is formed from one continuous kink-free area and the starting point of Ausiaufbereiches is still within the maximum print size.

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embodiment

The invention will be explained in more detail below using an exemplary embodiment.

The accompanying drawings show in

Figure 1: a cylinder arrangement

Figure 2: an inventively designed start-up of the

Channel pits Figure 3: an inventively designed outlet region of the channel pits

FIG. 1 shows an arrangement of a plate cylinder 1 with a first channel pit 2, 1, a blanket cylinder 3 with a second channel pit 2, 2 and a printing cylinder 4 with a third channel pit 2. 3. As is known, the channel elements 2 contain the clamping elements, not shown, for attachment "of elevators, printing plates and substrates.

The jacket surfaces 5 marked in FIGS. 2 and 3 each have a start-up region 6 and a discharge region 7 at the transitions to the channel pits 2, in which the lateral surfaces 5 of the contacting cylinders, plate cylinders 1 and the blanket cylinders 3 or blanket cylinders 3 and impression cylinders 4 face.

FIG. 2 shows an enlarged section of a cylinder 1,. 3 _f 4 of the start-up area 6 in its inventive design with the pressure insert line 8 and the inclination angle 9 includes.

FIG. 3 shows an enlarged section of a cylinder 1, 3, 4 with the outlet region 7 according to the invention, the starting point 10 of the outlet region 7 already lying in the pressure direction before the end of the maximum printing format 11. DeT inclination angle 9 of the start-up area 6 at the beginning of printing. greater than the second Neifimgswinkel 12 of the outlet region. 7

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At the end of printing, this results in a smaller effective length of the starting area 6 than the outlet area 7. The starting area β and the outlet area 7 are each formed as a continuous kink-free surface. The inventive design of the start-up and outlet areas of the channel pits ensures that all dynamically acting factors are taken into account in the overall system of the cylinder group. This results in the contact zones plate cylinder / blanket cylinder and blanket cylinder / impression cylinder a dynamically balanced rolling process, which is characterized by a beginning of zero steady increase in pressure at the beginning of printing and a steady reduction in pressure at the end of printing to zero. Constant increase and decrease of pressure will cause jerky excitation of the cylinders, and thus the generation of vibrations, which will cause band edges on the printed product. «

Claims (3)

Claim for invention ._ <y_ ^ 1 ύ 1, sheet-fed rotary printing press consisting of printing cylinder, blanket cylinder and plate cylinder, in the channel pits clamping elements for mounting the elevators, printing plates and substrates are housed, wherein the lateral surfaces of the cylinder at the channel edges have a flattened arrival and departure area, characterized in that the inclination angle (9 ) of the starting area (6) at the start of printing is greater than the second angle of inclination (12) of the outlet area (7) at the end of printing in the starting area (6) and in the outlet area (7) arranged opposite lateral surfaces (5) of the contacting cylinder (1.3 ; 3,4). 2, sheet-fed rotary printing machine according to item 1, characterized in that the start-up (6) and the outlet region (7) of a cylinder (1, 3, 4) are each formed from a continuous kink-free surface, 3 "Bogenrotationsdruclaaas chine according to item 1 and 2, characterized 'characterized in that the starting point (10) of the outlet region (7) is still within the maximum printing format (1.1). For this.....! Pages drawings