US 4,922,821 AGranted

Cleaning system of printing press

AssigneeDai Nippon Insatsu Kabushiki Kaisha

InventorsYoshiki Nozaka, Tetsuro Katsuta, Hiroshi Miyama

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Abstract

In a combination of a cleaning device of a cylinder of an offset sheet-fed press and a cylinder to be cleaned, the cleaning device is provided with a blade member as a cleaning cloth pressing member against the cylinder to be cleaned, the blade member having a relatively sharp edge pressing the cleaning cloth against the cylinder. The cylinder is an impression cylinder provided with sheet holding grippers projecting over the outer peripheral surface of the impression cylinder. The grippers are protected so as not to directly contact the cleaning cloth under the pressed condition by locating cam members to cover the grippers or by locating a cleaning device moving mechanism in a manner such that when the grippers approach the blade member during the rotation of the impression cylinder, the cleaning device is moved away therefrom.

Claims6

Dependent claims

A device for cleaning an impression cylinder of an offset, sheet-fed printing press, comprising:

a support frame;
a magazine roll around which a cleaning cloth is wound, said magazine roll having a rotation shaft supported by said support frame;
a take-up roll around which a used cleaning cloth is taken up, said take-up roll having a rotation shaft supported by said support frame;
pressing means comprising a blade member attached to said support frame at a portion between said magazine roll and said take-up roll and pressing said cleaning cloth against the impression cylinder to be cleaned, said blade member pressing said cleaning cloth against said cylinder in substantially a line contact along the length of said blade;
means attached to said support frame for supplying cleaning liquid to said cleaning cloth;
and
means for moving said support frame away from said impression cylinder, said means comprising sheet holding grippers provided on said impression cylinder and projecting over a peripheral surface of said impression cylinder, and means for detecting a predetermined angular position of said impression cylinder and moving said pressing means away from said impression cylinder, thereby preventing said grippers from directly contacting said cleaning cloth.

4 more elements

Dependencies are inferred from the claim text.