Printing – Print plate feeding or delivering
Patent
1994-05-12
1996-07-23
Funk, Stephen
Printing
Print plate feeding or delivering
1014151, 101485, B41F 2706
Patent
active
055379265
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a device, in the form of a magazine, for removing and/or supplying printing plates from or to a plate cylinder of a printing press, in particular for the automatic or semi-automatic changing of printing plates, with a plate-removing apparatus and a plate-supplying apparatus.
A device of the initially mentioned kind is known from European patent application 0 435 410. The purpose of said device is to automate the changing of printing plates.
The magazine holds old, used plates. For removal, the used printing plate is released from the plate cylinder at one end and is then--through appropriate rotation of the plate cylinder--partially inserted into the magazine. Subsequently, the other end of the printing plate is released by the tensioning device of the plate cylinder and the entire printing plate is introduced into the magazine with the plate-removing apparatus. Subsequently, a new printing plate to be used is taken from the magazine by means of the plate-supplying apparatus. First, one end of the printing plate is inserted into the corresponding clamping device of the plate cylinder, where it is clamped, and then--through rotation of the plate cylinder--the printing plate is removed completely from the magazine and is drawn around the outer cylindrical surface of the plate cylinder. Then, the other end of the printing plate is clamped and the plate is tensioned in the circumferential direction.
If the printing press comprises a plurality of printing units, a magazine is associated with each printing unit. For the removal and/or supply of printing plates, it is necessary for the magazine to be brought from a more or less vertical position into an obliquely inclined position in which the lower end of the magazine is opposite the outer cylindrical surface of the plate cylinder. Since the space between the individual printing units is tight on virtually all printing presses, only little space is available for the magazines. Consequently, the removal of old, used printing plates from-the magazine and/or the introduction of new, yet to be used printing plates into the magazine is associated with corresponding difficulties.
SUMMARY OF THE INVENTION
The object of the invention is to create a device of the initially mentioned kind, said device, while being of simple construction, reliable operation and small design, permitting the removal and/or supply of printing plates and also allowing printing plates to be introduced into and removed from the magazine in simple manner.
The object of the invention is achieved in that at least one cassette for the printing plates is removably associated with the magazine. This has the advantage that the new, yet to be used printing plates can be introduced into the cassette outside of the magazine, with the result that, in order to "load" the magazine, it is merely necessary to introduce the cassette into the magazine. In similar manner, the simple removal of old, used printing plates from the magazine is possible in that the used printing plates are introduced by means of the plate-removing apparatus into the cassette in the magazine, with the result that, for removal, it is merely necessary to remove the cassette, filled with used printing plates, from the magazine. The device according to the invention is suitable either for the removal of old, used printing plates or for the supply of new, yet to be used printing plates or, alternatively, also for the removal and supply of printing plates; that is, there is then a change of printing plates in which a used printing plate is accepted and a yet to be used printing plate is supplied from the magazine.
If the cassette both accepts used printing plates and also delivers yet to be used printing plates, it comprises a holding space for the used printing plates and a holding space for the yet to be used printing plates. To commence operation of the printing press, it is then merely necessary for this one cassette to be associated with the corresponding
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Japanese Patent Abstract No. 61-248834 (Shinichi), dated Nov. 6, 1986.
Beisel Hermann
Blaser Peter T.
Hauck Dieter
Hutzenlaub Rudolf
Jager Helmut
Funk Stephen
Greenberg Laurence A.
Heidelberger Druckmaschinen AG
Lerner Herbert L.
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