JPS6333458B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for deflecting an impression cylinder arranged parallel to the cylinder of a rotary printing press. In printing presses, especially intaglio printing presses, two cylinders are pressed against each other during the printing process. When the cylinder, which is supported at the shaft end in a bearing, is pressed against a second cylinder arranged parallel to this cylinder, said cylinder will sag. This deflection is greater in the center than at the ends. As a result, the crimp force between both shells is weaker in the center than at the ends. In order to obtain good printing results, it is desirable that the pressure force be uniform throughout the contact line.

In an impression cylinder for an intaglio printing press, which is already known from Swiss Patent No. 456 649, the impression cylinder consists of two parts: a jacket wall and a core. In order to avoid the above-mentioned problem of sagging, in the case of the impression cylinder known from this Swiss patent, the peripheral wall and the core are in contact with each other only over a certain length in the center of the cylinder. Furthermore, in the case of this known cylinder, the edges of the peripheral wall have a different shape than the central part. A cylinder made in this way is clearly expensive and, moreover, despite the construction of the cylinder as described above, the risk of sagging cannot be completely avoided.

Another device similar to the type mentioned at the outset is known from German Patent Application No. 2033515. In this device, a countermoment is applied to the intaglio plate cylinder of the printing press, which deflects the plate cylinder. In this case, the state of the deflection, ie the length and magnitude of the deflection, is adapted to the requirements of the respective printing format. In this device, bending moments are created by the action of forces directed at the two journals projecting beyond the bearing. To generate this force, a piston, which is placed above the journal and which is loaded with the flowing medium, acts in each case. During the printing process, the deflection of the cylinder must continue to be maintained, so that the fluid medium continuously
It is necessary to act on both pistons above the journal. Devices of the above type for creating bending moments are expensive and naturally require high operating costs. Furthermore, the bearing of the torso is
The above imposes an additional burden.

It is already known from DE 24 22 696 A1 to generate the bending moments necessary for deflecting the shell by means of mechanical tensioning devices, for example turnbuckles.
This known tensioning device, however, can only be used in a four-barrel device. This is because the four tensioning mechanisms used in this known device are supported on the four axes of the barrel.

The object of the invention is to provide a device for deflecting an impression cylinder or cylinder, which allows an adjustable, sustained and uniform tensioning to produce the desired bending moment by means of a simple tensioning device. It is to be.
In this device, additional loads on the impression cylinder bearings are avoided.

In order to solve this problem, in the configuration of the present invention,
In a device of the type mentioned at the outset, a tensioning device is provided which is arranged parallel to the impression cylinder, and which tensioning device is arranged at the end of the fixed shaft of the impression cylinder. A bending moment is applied to the shaft via the shaped member, and the bending moment is transmitted to the peripheral wall by a bearing arranged inside the impression cylinder between the shaft of the impression cylinder and the peripheral wall. did.
Further advantageous embodiments of the invention are evident from Section 2 et seq.

In an intaglio printing press, an impression cylinder cooperating with the plate cylinder exerts continuous pressure on the plate cylinder, so that uniform printing is produced over the entire print width without the need for a steel presser to support the impression cylinder. It is an advantage of the present invention that it can be attached. Depending on the deflection line of the plate cylinder used immediately in the printing press,
It is a further advantage of the invention that the impression cylinder deflection can be adjusted simply and precisely.

Next, the configuration of the present invention will be specifically explained with reference to the illustrated embodiment.

FIG. 1 shows a forme cylinder 10 of an intaglio printing press, which is rotatably mounted on both sides in each case on a wall of the printing press (not shown). Parallel to this forme cylinder 10 and at a small distance from it, an impression cylinder 16 is shown. Impression cylinder 1
6 is often called a presser and consists of a fixed shaft 2 and a rotatable peripheral wall 1. The peripheral wall 1 is supported on a fixed shaft 2 by means of several bearings 6, preferably rolling bearings.

The journal of shaft 2 has bearings 5 on the left and right, respectively.
It is preferably mounted on a spherical bearing. Bearing 5
is located in a partially illustrated frame 9. The frame 9 is slidable relative to the plate cylinder 10 in the direction of the arrow 15 via a known and commonly used sliding or pivoting device. As a result, the pressure between impression cylinder 16 and plate cylinder 10 required for each printing material can be adjusted.

The lower ends of each of the U-shaped members 3 are firmly arranged on opposite ends of the shaft 2 inside the frame 9.
The characteristic of the U-shaped member 3 is such that the force generated in the horizontal direction at the upper end of the U-shaped member 3 is completely transmitted to the shaft 2.
The shaped member 3 is provided. The upper end of the U-shaped element 3 is connected to a tensioning device 4 which extends parallel to the impression cylinder 16. In the embodiment shown here, the tensioning device 4 consists of a rod-shaped element, which has threads 7 and 8 at each of its ends. The leads of threads 7 and 8 run in opposite directions, ie one thread is left-handed and the other thread is right-handed. Both ends of the tensioning device 4 are each connected to a U-shaped member 3
It is connected with a corresponding internal thread provided at the upper end of the holder. As a result, by rotating the tensioning device 4 in a predetermined direction, the upper end of the U-shaped member 3 is tensioned. The moment caused by this is
It is transmitted to the shaft 2 via the U-shaped member 3. Impression cylinder 1
The circumferential wall 1 of 6 is connected to the shaft 2 via a bearing 6 arranged along the shaft 2, so that the bending moment caused by the tensioning device 4 is transferred to the U-shaped member 3. and shaft 2 and bearing 6
and to the peripheral wall 1 of the impression cylinder 16. As a result, the fixed shaft 2 and the peripheral wall 1 arranged on this shaft 2 are deflected.

The deflection line for the impression cylinder 16 or for the peripheral wall 1 of this impression cylinder 16 is designated by the reference numeral 11. tension device 4
The deflection scale can be adjusted by rotating by a predetermined scale using, for example, a commonly used spanner. The changes in the length and horizontal position of the shaft 2 caused by the deflection of the shaft 2 require the use of special bearings. It is therefore advantageous if a spherical bearing is used in the position of the bearing 5.

Impression cylinder 16 necessary to obtain uniform printing effect
The deflection (illustrated by the deflection line 11) of the plate cylinder 1 is adjustable by means of the tensioning device 4 of the invention.
Zero deflection (illustrated by deflection line 12) can be compensated for. By this, plate cylinder 1
0 and the impression cylinder 16, the printing material passes between the plate cylinder 10 and the impression cylinder 16 at each point.
6 also receives uniform pressure. The important requirements regarding the pressure line of the substrate between the impression cylinder 16 and the form cylinder 10, which are necessary to produce uniform printing, are thus fulfilled.

FIG. 2 shows a further advantageous embodiment of the U-shaped element 3 used in FIG. The U-shaped elements 3 may each have one hole, for example at the lower end, into which the shaft 2 is inserted.

Instead of using the U-shaped element 3 shown in FIG. 1, the lower end of the U-shaped element 3 can also be constituted by a hook 14 (see FIG. 2). The desired moment is applied via the U-shaped member 13 to the shaft 2
so that it is transmitted to axis 2 in order to deflect
Said hook 14 surrounds the shaft 2. By means of the hook 14, it is simply possible to remove the deflecting device from the printing press by removing the U-shaped member 13 arranged on the shaft 2. The hook 14 can, for example, be forged or welded together at the lower end of the U-shaped member 13.

Instead of using mechanical tensioning devices, it is also possible within the scope of the invention to use hydraulically or pneumatically driven devices.

[Brief explanation of the drawing]

The drawings schematically illustrate embodiments of the invention,
FIG. 1 is a partially cutaway front view of the plate cylinder, tensioning device, and impression cylinder, and FIG. 2 is a view showing a second embodiment of the holding portion of the tensioning device. 1... Peripheral wall, 2... Shaft, 3... U-shaped member, 4
...Tension device, 5 and 6...Bearing, 7 and 8...
...Screw thread, 9...Frame, 10...Plate cylinder, 11
and 12... deflection line, 13... U-shaped member, 1
4...Hook, 15...Arrow, 16...Impression cylinder.

Claims (1)

[Scope of Claims] 1. A device for bending an impression cylinder, which is arranged parallel to the cylinder of a rotary printing press and is composed of a shaft and a peripheral wall surrounding the shaft, in which the impression cylinder is A tensioning device 4 is provided which is arranged parallel to the impression cylinder 16 and which, via a parallel U-shaped member 3 which is arranged at the end of the fixed shaft 2 of the impression cylinder 16, Apply a bending moment to shaft 2,
The bending moment is caused by the bending moment inside the impression cylinder 16.
A bearing 6 disposed between the shaft 2 and the peripheral wall 1 of
A device for deflecting an impression cylinder of a rotary printing press, characterized in that the information is transmitted to the peripheral wall 1 by the following. 2. A U-shaped member 3 is arranged in each case on the shaft 2 between a bearing 5 of the shaft 2, which is arranged in a frame 9 movable towards the cylinder, and an end of the peripheral wall 1. The device according to scope 1. 3. Device according to claim 1, in which each U-shaped member 13 is arranged at the end of the shaft 2 via a hook 14. 4. The device according to claim 1, wherein the bearing 5 is a spherical bearing. 5. The device according to claim 1, wherein the bearing 6 is a rolling bearing. 6. The tensioning device 4 consists of a tensioning rod, which tensioning rod has threads 7, with opposite lead directions;
2. The device according to claim 1, wherein the device is connected to the U-shaped member 3 via 8. 7. The device according to claim 1, wherein the tensioning device 4 is a pneumatic or hydraulic device. 8. The apparatus according to claim 1, wherein the cylinder is a plate cylinder 10 of a rotary intaglio printing press.