Tension control system for web in form printing press

Details Tension control system for web in form printing press Tension control system for web in form printing press

1997-12-30

1999-08-17

Bennett, Christopher A.

Printing

Rolling contact machines

Rotary

101181, B41F 506

Patent

active

059377569

ABSTRACT:
A tension control system for a web in a form printing press permits arbitrary setting of tensions of a web at respective zones between an impression cylinder and respective rollers. The system includes tension detectors located on the upstream side of an impression cylinder in the printing portion and upstream side of a tension roller in the processing portion, for detecting tension on the web, speed adjusting mechanisms provided at least in respective drive systems of the impression cylinder and the tension roller adjacent to respective tension detectors, for adjusting respective rotation speeds of the impression cylinder and the tension roller on the basis of output signals from controllers, to which detected signals of respective tension detectors are fed back and tension setting devices associated with respective controllers. The controllers compare the detected values from respective tension detectors with set values from the tension setting devices and output the output signals for controlling rotation speeds of the impression cylinder and the tension roller so that differences between the compared values are reduced to zero.

REFERENCES:
patent: 4391190 (1983-07-01), Metzler
patent: 4722275 (1988-02-01), Taguchi et al.
patent: 4785734 (1988-11-01), Kawana et al.
patent: 5117753 (1992-06-01), Mamberer
patent: 5377589 (1995-01-01), Kruger et al.

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