Method and apparatus for controlling a washing operation in a pr

Details Method and apparatus for controlling a washing operation in a pr Method and apparatus for controlling a washing operation in a pr

1995-11-29

1998-03-17

Burr, Edgar S.

Printing

Cleaning attachments

101423, B41F 3500

Patent

active

057274703

ABSTRACT:
Printing press cylinders are washed with a washcloth which is selectively wound forward and backward between a rotatable supply drum and a rotatable takeup drum. The washcloth is thereby cyclically pressed against a surface of a respective cylinder of the printing press in the washing operation and it is transported onward onto the takeup drum. The washing operation is controlled by detecting, with a sensor system, a transport distance of the washcloth and furnishing, with the sensor, a transport distance signal. The system is initialized by checking whether or not the insert is present and/or whether or not the insert carries enough fresh washcloth. This is done by winding the washcloth forward and back by a given distance. During the ongoing washing operation the transport speed of the washcloth is continously determined from the transport distance signal and comparing with a predetermined lower value and a predetermined upper value. When these thresholds are met or exceeded, the washing operation is terminated or the printing press is stopped.

REFERENCES:
patent: 4986182 (1991-01-01), Sawaguchi et al.
patent: 5105740 (1992-04-01), Loos et al.
patent: 5150653 (1992-09-01), Hara
patent: 5178070 (1993-01-01), Zorn et al.
patent: 5209587 (1993-05-01), Herbert et al.
patent: 5275104 (1994-01-01), Corrado et al.
patent: 5479857 (1996-01-01), Braun

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