Printing – Printing members – Rolling contact
Patent
1998-05-22
1999-08-10
Burr, Edgar
Printing
Printing members
Rolling contact
428909, 1014151, B41F 2712
Patent
active
059341947
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a rubber blanket for a printing press The rubber blanket is a multi-layer blanket which is connected on its inner surface with a dimensionally stable support plate. At least one end of the support plate projects past an open end face of the multi-layer rubber blanket.
DESCRIPTION OF THE PRIOR ART
From DE 43 20 464 A1 it is known to insert beveled leading and trailing edges of a rubber blanket placed on a support plate together into a slit located on the surface of a cylinder. In this case, a space, which narrows in the direction of the slit, results between the bending lines. In order to prevent oscillations, this space is filled in a form-fitting manner.
A rubber blanket unit, consisting of a rubber blanket and a support plate, is described in U.S. Pat. No. 2,525,003. The rubber blanket unit is provided with two beveled edges, on each of which a beveled leg of the support plate is arranged to project past the ends of the rubber blanket. The rubber blanket on the support plate ends in the area of a bevel, which delimits the legs. These beveled legs are inserted into a narrow slit of approximately 6.5 mm width. A wedge is arranged between opposite lateral surfaces of the two legs. One leg is pressed against a lateral surface of the slit by this wedge. The rubber blanket unit is frictionally held in the slit in this way by means of a holding device embodied as a wedge.
In connection with this prior art rubber blanket unit it is disadvantageous that in the course of cleaning the rubber blanket cylinder, for example by means of a rotating brush, washing liquid enters between the two ends of the rubber blanket of the rubber blanket unit. Together with the rotation of the brush, a premature separation of at least one end of the rubber blanket is caused.
DE 29507523 U1 shows a rubber blanket unit consisting of a support plate and a multi-layer rubber blanket.
SUMMARY OF THE INVENTION
It is the object of the present invention to create a multi-layer rubber blanket with a dimensionally stable support plate.
This object is attained in accordance with the present invention by providing a rubber blanket unit for a rubber blanket cylinder of a printing press. The rubber blanket is a multi-layer that is secured to a dimensionally stable support plate. At least one end of the support plate projects past an open end face of the multi-layer rubber blanket.
The advantages to be obtained by means of the present invention consist, in particular, in that no separation from the rubber blanket support, or respectively the further rubber blanket layers, at the leading end of the rubber blanket occurs, even in the course of intensive mechanical and chemical cleaning. For the purpose of retaining the rubber blanket on the rubber blanket cylinder, it is only necessary to put the ends of the support into a slit. Because of this, the space without print becomes very small.
It furthermore is advantageous that a bristle roller cannot extend under the cover layer of the rubber blanket. In addition, no dampening or washing liquid can enter from the front face of the rubber blanket.
BRIEF DESCRIPTION OF THE DRAWINGS
The device in accordance with the present invention is represented in the drawings and will be described in more detail in what follows.
Shown are in:
FIG. 1, a schematic representation of a cross section of a rubber blanket in accordance with the invention on a rubber blanket support, whose one beveled edge is lifted out of a slit of the rubber blanket support; and
FIG. 2, a section through an enlarged schematic representation of both ends of the rubber blanket in accordance with the present invention applied to the rubber blanket support in a second embodiment.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
For receiving rubber blanket units 31 with beveled leading and trailing ends 3, 4, a rubber blanket cylinder 1 of a rotary printing press is provided with at least one narrow slit 7, which extends parallel to the axis of rotation of cylinder 1 and extends from
REFERENCES:
patent: 2525003 (1950-10-01), Smith
patent: 4643093 (1987-02-01), Goar et al.
patent: 5103729 (1992-04-01), Philpot
patent: 5188031 (1993-02-01), Depa et al.
patent: 5357863 (1994-10-01), McLean et al.
patent: 5669306 (1997-09-01), Puschnerat
patent: 5687648 (1997-11-01), Puschnerat
patent: 5749298 (1998-05-01), Castelli et al.
Puschnerat Helmut
Ruckmann Wolfgang Gunter
Burr Edgar
Grohusky Leslie
Koenig & Bauer--Albert Aktiengesellschaft
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