DD208782A1 - SHEETFED ROTARY PRINTING PRESS - Google Patents

Abstract

The invention relates to a Bogenoffsetrotationsdruckmaschine consisting of a plate cylinder, blanket cylinder and impression cylinder. Starting from the task of avoiding during the printing process a lifting of the plate and blanket cylinder in the functional clearance, the resulting from the weight of the plate cylinder and the cos of Zylinderzustellwinkels and the weight of the blanket cylinder and the cos of the delivery angle perpendicular to the cylinder surface associated normal force is greater than that against the normal force directed contact force between the plate cylinder and blanket cylinder and blanket cylinder and impression cylinder, wherein the weight of the blanket cylinder is designed so that a contact force of at least 50 N / cm high 2 is achieved.

Description

TEB Kombinat Polygraph "Werner Lamberz" Leipzig

7030 Leipzig

Leipzig, May 14, 1982

Sheetfed offset rotary press

field of use

The invention relates to a Bogenoff setrotationsdruckinaschine consisting of a plate cylinder, blanket cylinder and impression cylinder.

Characteristic of the known technical solutions

Sheetfed and rubber cylinders with functional clearance are stored on Bogenoff rotary presses.

To set the printing press on different printing materials plate and blanket cylinder via eccentric bearings are adjustable (DE 1 046 069).

The cylinders only touch over the outer shells. To 'image transfer from the plate to the blanket cylinder and the blanket cylinder on the printing material, which is guided by the printing cylinder, a certain contact force is required. In channel passages, the required contact force by

U.

24 135 2 8

Bearing games are disturbed.

This has an effect in the print result as a single color difference, which can occur in impermissible size.

Cylinder bearings in which the contact force is achieved by a geometric tension on the known eccentric bearings, the direction of the bearing component is reversed at channel passage, and it comes to a lifting of the plate or blanket cylinder in the functional game.

Object of the invention

The aim of the invention is, with economic means ü'infärbstörungen on the printed matter. avoid.

Object of the invention

The invention has for its object to avoid in a sheetfed offset »rotary printing machine during the printing process, a lifting of the plate and GummizylInders.im functional game.

Essence of the invention

According to the invention, the object is achieved in that a resulting from the weight of the plate cylinder 3 and the cos of the Zylinderzustellwinkels and the weight of the rubber cylinder and the cos of the delivery angle perpendicular to the cylinder surface associated normal force greater than the geriohtete against the normal force contact force between the plate cylinder and rubber cylinder and rubber; Lzylinder and impression cylinder, wherein the weight of the blanket cylinder is designed so that a contact force of at least

2 50 N / cm is achieved.

k0M1932 * O4O744

241352 8

Ausführungsbeispie1

The invention will be explained in more detail with reference to an embodiment

 The accompanying drawings show in

1 shows a cylinder arrangement with different position of the cylinder channels with power plan;

Figure 2 shows a cylinder assembly with opposing cylinder channels in the plate and blanket cylinder with force plan;

Figure 3 shows a cylinder arrangement with opposing cylinder channels in the rubber and pressure cylinder with power plan.

Figure 1 shows an arrangement of a plate cylinder 1, a blanket cylinder 2 and a pressure cylinder 3 »The cylinders 1 to 3 are each provided with a cylinder channel ^L \ - , which are located in different positions. The force diagram associated with this cylinder division shows the perpendicularly acting force line of the weight Gp of the plate cylinder 1 and the force line of the normal force Npjn · acting on the normal force Np-rr, acting perpendicular to the cylinder surface 2.1 of the blanket cylinder 2 in the cylinder delivery angle des of the plate cylinder 1. The power line of the weight G ^ of the blanket cylinder 2 closes vertically. In the direction of the connecting line between the center M _{2 of} the blanket cylinder 2 and the center NU of the printing cylinder 3 effective in the delivery angle ^ ^ it blanket cylinder 2 to the impression cylinder 3, the normal force Ν ^ γ ^.

The normal force Νρ- ™ and Nqj-q are each greater than the required contact force Np between the cylinders 1, 2 and 2, 3 · In addition, an acting in the same direction as the contact force Np in the axial direction bearing force component remains N- ^ left. To complete the force plan, the tangential to the

241352 8

Touching surfaces of the cylinder 1, 2, 3 acting bearing force components IL drawn.

Figure 2 shows an arrangement of the cylinders 1, 2 and 3 "with the cylinder channels 4- face the plate cylinder 1 and the blanket cylinder 2.

The in this operating position; acting forces are shown in the corresponding force plan. The forces acting are the weight of the rubber cylinder G ^ and the cylinder in the cylinder y, the plate cylinder 1 to the blanket cylinder 2 arranged normal force N ^ - ^.

In this operating position, too, the required contact force Np is smaller than the normal force Nqj-q acting perpendicular to the cylinder surface 3.1 of the impression cylinder 3, that a bearing force component Nt provided with the same sign as the contact force Np acts.

In Figure 3 and in the associated power plan is a cylinder assembly with opposing cylinder channels 4 of Gummizy-. Linders 2 and 3 of the impression cylinder. The force diagram shows in this operating position, the force line of the perpendicular weight Gp of the plate cylinder 1 and the Zylinderzustellwinkel ^ of the plate cylinder 1 to the blanket cylinder 2 in the direction of the line connecting the centers IVL and M £ shown force line of perpendicular to the cylinder surface 2.1 of the blanket cylinder 2 normal force np j ^. The contact force Np directed against the normal force Νργ "is also smaller than the normal force in this operating position, so that a bearing force component Nj with the same sign as the contact force Np still becomes effective.

The inventive solution is achieved in all operating positions of the cylinder, that in the same direction as the required contact force Np acting bearing force component N ^ is present.

A change of direction of the bearing force component N ^ and a lifting of the plate cylinder or the blanket cylinder are thus excluded.

λ ι,

-5- 24 13

Plate cylinder and blanket cylinder are in each operating position almost at the lowest point of storage. By meeting the requirement that the normal force in each operating position of the cylinder is greater than the required contact force, which can be achieved by increasing the weight of the blanket cylinder, a stable stable cylinder position is achieved and thus Einprägbstörungen by lifting the cylinder to a few hundredths of a millimeter are avoided.

The increase in the weight of the rubber cylinder can be achieved economically by filling the hollow body of the rubber cylinder with a cheap filler material or by forming the rubber cylinder, except for the cylinder channel, as a solid cylinder

 The weight of the blanket cylinder is designed such that

the bearing force Np of greater than 50 N / cm is made possible without taking into account the bearing force component N-r.

UiMV .1

Claims (1)

- ⁶ "24 1352 8 He f indungs ans pr iic he Bogenoffsetrotationsdruokmaschine with plate cylinder, blanket cylinder and impression cylinder, characterized in that one of the weight (Gp) of the plate cylinder (1) and the cos of Zylinderzustellwinkels (^) and the weight (G ^) of the rubber cylinder (2) and the cos of the feed angle ( g) resulting perpendicular to the cylinder surface (2.1, 3.1) associated normal force (Νρ-τ-Λ, Ugjn) greater than the normal force (Νργη Νγ, -τ-τΟ directed contact force (Np, j 5 Np ^) between Plattenaylinder (1) and blanket cylinder (2) and blanket cylinder (2) and impression cylinder (3). Sheet-fed rotary printing machine according to item 1, characterized in that by the "weight (G _r ) of the blanket cylinder (2) a contact force (Np) of at least 50 N / cm is present. Dazu..2 pages drawings