Safety device for the control of web-fed rotary printing machines
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United States of America Patent
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Jun 18, 1991
Grant Date -
N/A
app pub date -
Oct 3, 1986
filing date -
Dec 13, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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