US 5,309,836 AGranted

Cleaning device for offset printing machine

AssigneeComtec Co., Ltd.

InventorHideo Takeuchi

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Abstract

A cleaning device is disclosed for an offset printing machine for quickly removing stains on a printed matter. A number of scrapers (7) are arranged in an axial direction of the surface of a printing drum (1) of the offset printing machine. The scrapers (7) are held by rods of air cylinders (8) which cause the scrapers to contact or be separated away from the surface of the drum (1). Solenoid valves are arranged corresponding to respective cylinders. The solenoid valves are controlled by a control unit (16). The position of hickey on the surface of the drum is designated from an information of a hickey position on the printed matter generated corresponding to the stain on the surface of the drum. When the associated solenoid valves are actuated, then the scrapers are brought into contact with the hickey position on the drum surface to scrape the hickey.

Claims12

Dependent claims

A cleaning device for an offset printing machine, comprising:

a plurality of scrapers arranged along a surface of a printing drum of the printing machine for scraping hickeys on the surface of the printing drum;
a plurality of associated air cylinders for bringing the respective scrapers into contact with and away from the surface of the printing drum;
a plurality of solenoid valves disposed for the associated air cylinders;
and
a control unit having an operation board and a control board, said control board receiving signals generated by the operational board, the control board including a solenoid valve drive circuit, a memory circuit, and a timer circuit, said solenoid drive circuit turning on and off the valves, said memory circuit storing received signals indicating the positions of hickeys on the printing drum, said timer circuit setting a period of time for opening the valves to cause said scrapers to remove said hickeys.

2 more elements

Dependencies are inferred from the claim text.