JPS647584B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylinder of a printing unit of a rotary printing press, in which cylinder pillows are arranged in contact with both cylinder end faces, and the cylinder pillows are formed by a conical concentric annular surface. It relates to a type in which the cylinder is attached to the cylinder in a centered manner with respect to the axis of rotation of the cylinder.

A known torso of this type (German Patent Application No. 28 47 880) has a conical seating surface on the axle neck and a conical seating surface adapted to the seating surface in order to support trunk pillows on both sides of the torso. A corresponding seating surface of conical shape is provided on the trunk pillow. The degree of conicity of these cones is determined by the self-binding action that occurs after the trunk pillow is crimped.
It has been chosen so that no further fixation is required.

This known arrangement requires an expensive hydraulic device to separate the torso pillow from its seating surface in order to replace the torso pillow. Another significant drawback of this known arrangement is that
The conical seating surfaces of the neck and trunk pillows must be manufactured with high precision, which has a detrimental effect on the price of the trunk pillow.

The object of the invention is to ensure a precise centering of the cylinder pillow on the cylinder of the printing unit, and also to ensure that the cylinder pillow can be easily installed or removed and that it is not influenced by elastic deformations of its surroundings. To provide support and fixation of a trunk pillow to a trunk in such a way that the pillow is supported on the trunk and also prevents rust on the fitting surface.

This object is achieved by a cylinder having the characteristics of claim 1 of the invention. Such simple and precise centering of the body pillow ensures rapid replacement and accurate centering of worn body pillows. Moreover, even if elastic deflection of the journal occurs, the trunk pillow does not change its position relative to the trunk, since it is directly fixed to the end surface of the trunk. Furthermore, the risk of destruction of the copper pillow due to rust on the seating surface is eliminated. The conical concentric annular surface can be provided either in the trunk pillow or in the journal, but if it is provided in the journal, a cylindrical step must be formed in the hole in the trunk pillow; Since the edge of the stepped portion lies within the hole, it is difficult to process it with high precision. On the other hand, it is relatively easy to provide the trunk pillow with a conical annular surface as a conical hole. In that case, a centering ring will be provided on the journal, but the centering ring in that case faces the outside and can be easily machined with high precision. According to the invention, therefore, a centering ring is provided on the journal and a centering annular surface is provided on the trunk pillow. Further, according to the present invention, installation is extremely simple compared to the case where a separate positioning tool is provided, as disclosed in, for example, Japanese Utility Model Publication No. 54-41888.

Next, embodiments of the present invention will be described with reference to the drawings.

The illustrated cylinder 1 can be, for example, a plate cylinder, a blanket cylinder, an impression cylinder or the like used in a printing unit of a rotary printing press. A cylinder 1 of this kind is subjected to a mutual pressing force which causes an elastic deflection of the journal 2. In order to accurately fix the distance between the individual cylinders and the magnitude of the pressing force thereof, cylinder pillows 3 that roll against each other are provided on both cylinder end faces, respectively. In other words, the pressure force between the cylinders must be such that the cylinder pillows do not separate from each other even during operation of the printing press.

The key for the torso pillow 3 is that it is precisely centered with respect to the axis of rotation of the torso. For this purpose, according to the invention, a centering element is provided immediately next to the cylinder end face 4, which in the embodiment according to FIG. It is formed as. This centering ring 5 has a centering edge 6 which is such that after the centering and fixing process the centering edge 6 is deformed both elastically and plastically. It cooperates with a conical concentric annular surface 7.

A large number of elongated extension bolts 8 are provided in the region of the journal 2 as tightening means for tightly connecting the trunk pillow 3 and the trunk end surface 4. The centering edge 6 serves only for the correct centering of the torso pillow 3, and the extension bolt 8 holds the torso pillow with such a high crimping force that the crimping force acting in the radial direction of the torso cannot cause any change in the position of the torso pillow. 3 onto the body end surface 4. When the torso is removed, for example to replace the torso pillow, the torso pillow can be pulled out from the centering edge without any problems and the new torso pillow 3 can be pulled out as accurately as the previously used torso pillow. The torso pillow can then be screwed to the torso to form a unit therewith.

FIG. 2 shows the extension bolt 8 and the trunk pillow 3 in the area of the journal 2 from the end side. The two holes 14 are provided in a well-known, not shown, shell 1.
Provided for the tightening spindle within.

FIG. 3 shows an enlarged view of the centering element shown in FIG. 1, in which the elastic and plastic deformations of the centering edge 6 are greatly exaggerated. In practice, the cooperation between the conical centering annular surface 7 and the centering edge is designed such that the centering edge 6 remains deformed only to such an extent that it maintains precise centering.
The centering edge 6 may be configured with an acute angle. However, in practice, the centering edge is provided with a slight rounding or a very narrow chamfer. The width of this rounded or chamfered portion is several tenths of a millimeter.

This new type of support and fastening of the cylinder head 3 on the cylinder of the printing unit not only guarantees the exact centering of the cylinder head 3 and hence its perfect circular rotation accuracy, but also makes it easier for the cylinder head to be mounted or mounted. It becomes removable, and elastic deformation around the trunk pillow is not induced by the tightening connection of the trunk pillow to the trunk end surface 4.
Rust on the mating surfaces is also satisfactorily prevented.

[Brief explanation of drawings]

The drawings show an embodiment of the trunk according to the present invention, in which FIG. 1 is a partial longitudinal sectional view of the trunk with a trunk pillow, FIG. 2 is an end view of the trunk pillow, and FIG. is a partially enlarged view of the centering member of the trunk pillow. 1... Torso, 2... Journal, 3... Torso pillow, 4
...Body end face, 5... Centering ring, 6... Centering edge,
7... Centered annular surface, 8... Extension bolt, 9... Centered annular surface, 11... Hole, 14... Hole.

Claims (1)

[Scope of Claims] 1. A cylinder of a printing unit of a rotary printing press, in which a cylinder pillow 3 is arranged in contact with both cylinder end faces 4, and this cylinder pillow is arranged by a conical concentric annular surface 7. In the type in which the trunk pillow 3 is attached to the trunk 1 centered with respect to the axis of rotation of the trunk, the trunk pillow 3 has a conical center on the side facing the trunk 1 starting from the cylindrical hole 11 of the trunk pillow 3. The conical concentric annular surface 7 is connected to a cylindrical centering ring 5 provided coaxially with the cylinder 1 in the journal 2 of the cylinder 1 in the vicinity of the cylinder end face 4. A cylinder of a printing unit of a rotary printing press, characterized in that it is axially pressed and held, thereby centering the cylinder pillow 3 with respect to the cylinder 1. 2. A large number of elongated extension bolts 8 are provided around the journal 2 of the trunk 1 as tightening members for axially tightening the connection between the trunk pillow 3 and the trunk end surface 4. The cylinder of the printing unit of the rotary printing press described.