Device and method for driving a printing machine with multiple uncoupled motors
AssigneeHeidelberger Druckmaschinen AG
InventorsKlaus Hartmann, Bernhard Wagensommer, Michael Krueger
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Abstract
A device and method for synchronizing at least two printing-unit groups (2, 3) which represent a sheet-fed printing machine (1). Between the two printing-unit groups (2, 3) there is provided a transfer unit (10) being operable by means of a separately controllable drive (12). The present invention is used in sheet-fed printing machines assembled in serial arrangement.
Claims2
A method for synchronous transfer of printed sheets through a transfer unit arranged between a front printing-unit group in front of the transfer unit having an impression cylinder forming a printing nip and a rear printing-unit group behind the transfer unit having an impression cylinder forming a printing nip, the front and rear printing-unit groups being driven by at least one separate drive and the transfer unit being located outside the printing nips, the method comprising:
- first establishing a first phase synchronism through the transfer unit with respect to the front printing-unit group;
- and
- then establishing a second phase synchronism with respect to the rear printing-unit group.
A method for synchronous transfer of printed sheets through a transfer unit arranged between a front printing-unit group in front of the transfer unit and a rear printing-unit group behind the transfer unit, the front and rear printing-unit groups being driven by at least one separate drive, the method comprising:
- first establishing a first phase synchronism through the transfer unit with respect to the front printing-unit group;
- and
- then establishing a second phase synchronism with respect to the rear printing-unit group,
- wherein the first and second phase synchronisms are established by a defined engagement between flanks of teeth of gear wheels of the front printing-unit group and the transfer unit and between flanks of teeth of gear wheels of the rear printing-unit group and the transfer unit.
Dependencies are inferred from the claim text.