Printing – Flexible-sheet-securing devices
Patent
1999-04-12
2000-08-15
Yan, Ren
Printing
Flexible-sheet-securing devices
101378, B41F 2712
Patent
active
061019429
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a device for releasing plates from a cylinder of a rotary printing press. Beveled or angled ends of the plates are placed in a narrow insertion slit. Plate end clamping elements have protrusions which act as plate end ejections.
DESCRIPTION OF THE PRIOR ART
A plate cylinder with a device for lifting a printing plate is known from DE 43 03 381 A1. For this purpose, the plate cylinder has bores underneath the printing plate. These bores can be charged with compressed air for lifting the printing plate.
This prior art printing cylinder has a limitation in that elaborate compressed air feed lines are necessary.
DE 44 15 622 describes a device for fastening a plate on a plate cylinder. Here, a shaft with centrifugal force elements is provided for clamping, and a push-out edge for releasing the plate.
DE 195 09 562 C1 shows a device for releasing plates from a cylinder of a rotary printing press by means of a leaf-shaped lifter.
SUMMARY OF THE INVENTION
The object of the present invention is based on providing a device for releasing printing plates with beveled ends from a cylinder of a rotary printing press. At least one beveled end of the plate can be released from the cylinder using the device of the present invention.
In accordance with the present invention, this object is attained by using a plate end holder having a plurality of resilient clamping elements which press against a plate end inserted into a cylinder insertion slit. At least some of the clamping elements have a protrusion on their plate end engaging faces. These protrusions can engage a plate edge to push the plate end out of the insertion slit.
The advantages which can be achieved by the present invention reside, in particular, in that the release of a beveled edge of the plate from the surface of the plate cylinder takes place with the use of a generally known clamping device. The clamping device consists of a pivotable spindle which has hooks or projections in accordance with the present invention, on its circumference, which are engageable with an edge of and act on the trailing end of the plate. The end of the plate, which has been released from the surface of the plate cylinder by the turning of the spindle which carries the projections, therefore can be removed without further aids from the axial slit in the cylinder, for example. Moreover, no elements are arranged outside of the cylinder, or project past the surface of the cylinder. The hooks or projections of the device in accordance with the present invention move inside the slit receiving the ends of the plate, or respectively in a groove of the spindle. Therefore no additional space is required for the device in accordance with the present invention in the area of the surface of the cylinder. A surface of the plate, which can be maximally printed, remains and is not reduced, as would be the situation if bores or movable strips, for example, are arranged in the surface.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment of the present invention is represented in the drawings and will be described in greater detail in what follows.
Shown are in:
FIG. 1, a schematic representation of a cross section through a device in accordance with the present, invention in a clamping position;
FIG. 2, a detail "Z" in FIG. 1, with an enlarged representation of a hook in the clamping position;
FIG. 3, a corresponding representation in accordance with FIG. 2 with a hook in the release position;
FIG. 4, a plan view A in accordance with FIG. 2 of a hook strip, but without showing the beveled legs of the plate; and in
FIG. 5, a plan view H in accordance with FIG. 2 of a further embodiment variation.
DESCRIPTION OF THE PREFERRED EMBODIMENT
For receiving flexible plates 2 with beveled ends 3, 4, a cylinder 1 of a rotary printing press is provided with at least one narrow plate end insertion slit 8 extending parallel in respect to an axis of rotation from a surface 6 of the cylinder 1 into its interior 7. This structure may be seen
REFERENCES:
patent: 3016010 (1962-01-01), Luehrs
patent: 5461981 (1995-10-01), Schneider
patent: 5483891 (1996-01-01), Reichel
patent: 5651315 (1997-07-01), Ruckmann et al.
patent: 5692443 (1997-12-01), Reutter
Grohusky Leslie J.
Koenig & Bauer Aktiengesellschaft
Yan Ren
LandOfFree
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