Safety device for the control of web-fed rotary printing machine

Details Safety device for the control of web-fed rotary printing machine Safety device for the control of web-fed rotary printing machine

1986-10-03

1991-06-18

Eickholt, Eugene H.

Printing

Rolling contact machines

Rotary

101219, 101228, 250548, 226 45, B41F 500

Patent

active

050241567

ABSTRACT:
A safety device for control of a roller rotary printing machine includes a plurality of sensors positioned either before or behind a web advancing device for recognizing tears or other damages in a region of the edges of the advancing web, an evaluation device having an input connected to the sensors and an output at which an impulse-like control signal is issued, and a switching device connected to the output of the evaluation device and arranged in a path of the web of the printing machine. The switching device is adapted for an abrupt lowering of a web tension upon receiving the signal from the evaluation device.

REFERENCES:
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patent: 2840372 (1958-06-01), Alhand
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patent: 3905533 (1975-09-01), Corse
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patent: 4078487 (1978-03-01), McComb
patent: 4350275 (1982-09-01), Kunn
patent: 4411393 (1983-10-01), Jodrey et al.
patent: 4549485 (1985-10-01), Nawrath
patent: 4722275 (1988-02-01), Taguchi et al.
patent: 4728800 (1988-03-01), Surka
"Management of Dynamic Tension in a Moving Foil Web" IBM Tech. Discl. Bulletin, vol. 15, No. 2, 7/72, p. 513.
"Document Sensor" IBM Tech. Discl. Bulletin, vol. 9, No. 7, 12/66, p. 844.

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