Printing – Print plate feeding or delivering
Patent
1995-03-16
1996-09-17
Yan, Ren
Printing
Print plate feeding or delivering
1014151, B41F 2706
Patent
active
055558100
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a device for supplying printing plates to, and removing them from a plate cylinder of a rotary printing press.
DESCRIPTION OF THE PRIOR ART
A device for applying a plate to and removing it from a plate cylinder of an offset printing press is known from JP 61-248834 (A), wherein the plate is supplied to the plate cylinder from a compartment and is subsequently clamped to the exterior circumference of the plate cylinder and pressed against it by means of a roller while the plate cylinder turns and is subsequently fastened. The removal of the plate from the plate cylinder of a print unit takes place by means of a clamp which is connected with a drawing device fastened on another print unit.
It is disadvantageous in this device that the removal of the plate from the printing cylinder takes up very much space and time, because the plate must be pulled diagonally across the free cross section of the operating platform of the printing unit by means of the drawing device.
A method and a device for the automatic changing of a printing plate is described in EP-A-432660. A pressure roller which can be brought into two positions is disposed in this device. In a first position, the removal position, the pressure roller is pivoted away from the plate cylinder, while in the second position, the application position, the pressure roller presses the printing plate on the cylinder.
For mounting the printing plate, its printing plate front edge is guided between the front wall of the storage compartment and an additional guide plate. During dismounting of the printing plate its printing plate end springs against the guide plate and is subsequently guided by the guide plate between two driving rollers.
SUMMARY OF THE INVENTION
It is the object of the invention to reduce, in a device for supplying printing plates to and removing them from a plate cylinder, the number of rollers or aids for supplying, removing and applying the printing plate.
Printing plates being supplied to and removed from a plate cylinder are stored in separate compartments of a storage container. One compartment is the supply compartment and the other is the removal compartment. An undivided guide compartment leading to the plate cylinder is located adjoining the supply and removal compartments. A roller, which can be brought into several positions in relation to the jacket of the plate cylinder, is placed at the lower end of the guide compartment.
The following advantages in particular are realized by means of the invention. The cylinder device embodied as a pressure roller performs altogether three functions, namely first, in addition to pressing the plate on the plate cylinder during plate changes, secondly, during removal and thirdly during supplying a printing plate, the cylinder device in conjuction with the rounded guide elements disposed in the vicinity of the front ends inside the compartment acts as a guide element for the printing plates with a definable gap between the rubber roller and the plate cylinder. Furthermore, only two positions of the plate cylinder are needed for a plate change.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in detail below by means of several exemplary embodiments. In the associated drawings are shown in:
FIG. 1, a schematic side view of the device of the invention with a printing plate in the removal position;
FIG. 2, a view taken in the direction indicated by arrow A in accordance with FIG. 1;
FIG. 3, an enlarged representation of a detail taken at X in accordance with FIG. 1;
FIG. 4, an enlarged representation of the guide compartment as well as the cylinder device in accordance with FIG. 1, but with a printing plate in the supply position;
FIG. 5, an enlarged representation of the guide compartment with the cylinder device in the applied position;
FIG. 6, a second embodiment of the present invention in a schematic side view; and
FIG. 7, a view taken in the direction indicated by arrow P in accordance with FIG. 6.
DESCRIPTION OF THE PR
REFERENCES:
patent: 5111744 (1992-05-01), Wieland
patent: 5127328 (1992-07-01), Wieland
Koenig & Bauer Aktiengesellschaft
Yan Ren
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