Printing – Flexible-sheet-securing devices
Patent
1996-07-17
1998-01-20
Eickholt, Eugene H.
Printing
Flexible-sheet-securing devices
101477, B41F 128
Patent
active
057091501
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a device for mounting, removing and transporting of easily bendable curved objects with suspension edges, preferably printing plates, on and from a cylinder of a rotary printing press.
DESCRIPTION OF THE PRIOR ART
DE 28 04 970 A1 describes a device for mounting and removing printing plates in a rotary printing press.
In this case a suction element performs a linear movement between a delivery roller and a plate cylinder and in this way transports the printing plate.
This suction element is fastened by means of cylinders on a carriage driven by a chain. By means of this cylinder, the suction element can perform a tilting movement at right angles in respect to the carriage movement for lifting and lowering the printing plate. For assembly, the suction element fixes a beveled front edge of the printing plate in place by switching on the suction effect. The suction element together with the plate is lifted by means of the cylinder and moved in the direction toward the plate cylinder by the carriage with the chain drive. A positioning table is located between the delivery roller and the plate cylinder, on which the printing plate is placed and positioned. Thereafter, the suction element again picks up the printing plate and transports it to a groove of the plate cylinder. The beveled edge of the printing plate is inserted into this groove of the plate cylinder by lowering the suction element.
After the suction effect has been turned off, the plate cylinder turns together with the printing plate which is simultaneously wound off the delivery roller. Once the printing plate is almost completely wound off the delivery roller, the suction element grips a rear of the printing plate and guides it into a further groove of the plate cylinder.
It is disadvantageous in connection with this, device that it is necessary to deposit and position the printing plate on a positioning table which is located between the delivery cylinder and the plate cylinder. It is possible for tolerances, for example because of play in the carriage guidance, to occur during the transport of the printing plate from the positioning table to the cylinder and during the suspension process of the printing plate in the cylinder, which cause an erroneous axial position of the printing plate on the cylinder.
U.S. Pat. No. 4,727,807 A describes a device for mounting and removing printing plates in a rotary printing press. In this case, a manipulation device which picks up the printing plates is moved by a robot between a preparation device and a plate cylinder. Four suction grippers, by means of which the printing plate is held, are rigidly disposed on the manipulation device.
For assembly, the printing plate is moved from the preparation device to the plate cylinder by multi-axial movements of the robot and is suspended with a beveled edge in a clamping channel of the cylinder.
The axial positioning of the printing plate takes place via a drive which is regulated by means of force sensors. Subsequently, four pressure rollers are applied by pivoting the manipulation device. The printing plate is placed on the plate cylinder by rotating the plate cylinder and a further end is inserted into the channel.
It is disadvantageous with this device that the manipulation unit must be movable and pivotable in several directions in the radial plane of the plate cylinder and that complicated drives and controls are required for this. It is furthermore not possible to transport and mount or remove several printing plates per cylinder simultaneously.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide a device for mounting, removing and transporting easily bendable, curved objects with suspension edges, preferably printing plates, whose respective legs form an angle of less than 90.degree. and which have no recesses for register pins, without a device for pre-positioning, for example a positioning table, and without a robot, and which allows operation and maintenance without hind
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patent: 4191105 (1980-03-01), Ohlsson
patent: 4727807 (1988-03-01), Suzuki et al.
patent: 5259314 (1993-11-01), Sugiyama
patent: 5331892 (1994-07-01), Sieb et al.
patent: 5443006 (1995-08-01), Beisel et al.
patent: 5495805 (1996-03-01), Beisel et al.
patent: 5537926 (1996-07-01), Beisel et al.
Durr Reinhold Rudolf
Muth Bernhard Walter Wolfgang
Eickholt Eugene H.
Koenig & Bauer--Albert Aktiengesellschaft
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