Printing unit of a web-fed rotary press
A printing unit of a web-fed rotary press, with several printing couples, wherein each printing couple has a form cylinder, a transfer cylinder, an inking couple and preferably a dampening unit. At least one printing couple of the printing unit is positioned on each side of the printing unit, wherein on both sides of the printing unit, the inking couple and possibly the dampening unit of the printing couple or of each printing couple arranged on the respective side of the printing unit form an inking module. Each inking module of the printing unit can be moved relative to the other assemblies of the printing unit by an air cushion conveyance device.
1 . A printing unit printing unit of a web-fed rotary press, the printing unit comprising at least one pair of printing couples, each said printing couple comprising:
a form cylinder;
a transfer cylinder;
an inking couple which can be positioned next to said transfer cylinder, said inking couple forming part of an inking module; and
an air cushion conveyance device which supports the inking module on a cushion of air and conveys the inking module relative to the transfer cylinder.
2 . The printing unit of claim 1 further comprising a mounting level for each pair of inking modules, each said air cushion conveyance device forming an air cushion between said mounting level and a respective said inking module.
3 . The printing unit of claim a wherein each said air cushion conveyance device is fixed to a respective said inking module.
4 . The printing unit of claim 3 wherein each said air cushion conveyance device comprises at least two air cushion modules which can be individually regulated to produce unequal air pressures for supporting unequal loads.
5 . The printing unit of claim 1 wherein at least one said air cushion conveyance device is a flexible air cushion device that can be moved under a respective said inking module to provide a cushion of air for supporting the inking module.
6 . The printing unit of claim 5 wherein the flexible air cushion conveyance device is an air cushion transfer carriage.
7 . The printing unit of claim 6 further comprising an air cushion track having flexible travel paths which are followed by the flexible air cushion device to an impression throw-on position, an impression throw-off position, a set-up position, a maintenance position, and a service position.
8 . The printing unit of claim 1 wherein each said inking module further comprises a dampening unit which can be positioned next to a respective said transfer cylinder.
9 . The printing unit of claim 1 wherein each said inking module comprises two of said inking units.