Printing – Print plate feeding or delivering
Patent
1994-05-12
1995-08-22
Eickholt, Eugene H.
Printing
Print plate feeding or delivering
1014151, B41F 128
Patent
active
054430062
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device, in the form of a magazine, for removing printing plates from a plate cylinder of a printing press, in particular for the automatic or semi-automatic changing of printing plates, with a plate-removing apparatus, said apparatus comprising activatable (first) holding means for the respective printing plate.
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. The plate-removing apparatus of the known device comprises suction pads which are adapted to be moved by means of a piston/cylinder unit. Since the cylinder of the piston/cylinder unit is of a length identical to that of the piston rod and its longitudinal extent adjoins the motion path of the piston, this necessitates a correspondingly long design of the magazine.
The object of the invention is to create a device of the initially mentioned kind, said device permitting the removal of printing plates while being of simple construction, reliable operation and small design.
The object of the invention is achieved in that the (first) holding means are disposed on a first carriage, said carriage being adapted to be moved along a first guide more or less over the whole length of the device, inside the magazine. The fact that the first carriage is adapted to be moved more or less over the whole length of the device inside the magazine means that old, used printing plates can be introduced completely into the cassette of the magazine in one operation. This would not be possible by means of a conventional piston/cylinder unit, because the latter itself is of a certain length and said length is not available for the displacement travel.
The first holding means are preferably in the form of activatable first suction elements.
It is particularly advantageous if the first carriage is adapted to be moved by means of a driving apparatus, said driving apparatus comprising a magnetic coupling. The magnetic coupling represents not a rigid, but a flexible coupling and, moreover, it is possible therewith to move the first carriage over the whole length of the device.
In particular, it is provided that the driving apparatus comprises a non-ferromagnetic tube, said tube extending along the motion path of the first carriage and being longitudinally displaceably surrounded by a ferromagnetic component attached to the carriage, particularly a steel ring, with a magnetic piston, longitudinally movable by a pressure medium, being disposed in the tube, said piston forming the magnetic coupling together with the ferromagnetic component. If, therefore, the magnetic piston is displaced in desired manner in the tube through the pressure medium, the ferromagnetic component and-thus the first carriage are moved along their guide. The guide consists preferably of two spaced-apart guide parts, particularly guide rods. Said guide parts extend preferably parallel to one another. The two guides are disposed in the side regions of the magazine. The driving apparatus is situated preferably bet
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patent: 5224423 (1993-07-01), Borel
Beisel Hermann
Blaser Peter T.
Hauck Dieter
Hutzenlaub Rudolf
Jager Helmut
Eickholt Eugene H.
Greenberg Laurence A.
Heidelberger Druckmaschinen AG
Lerner Herbert L.
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