Anti-wrap device for a web press

Details Anti-wrap device for a web press Anti-wrap device for a web press

1995-05-04

1997-10-21

Bennett, Christopher A.

Printing

Rolling contact machines

Rotary

101228, 101219, 101484, 226 11, B41F 1302

Patent

active

056784848

ABSTRACT:
A system and method for preventing a broken printing web from wrapping about or otherwise fouling the blanket cylinders of printing press units. The system and method includes a web tensioning device located downstream of the printing press units for maintaining tension upon a broken web and pulling the web from the printing press units. The device includes a plurality of web disturbance detectors for detecting a wave, ripple or other disturbance indicative of a web break. A pair of anti-wrap rollers located above and below the web are engaged upon detection of a web break to engage the web between them to exert tension onto the web and pull it from the printing units. The anti-wrap rollers are rotated at a surface speed nominally greater than the surface speed of the printing rolls. The anti-wrap rollers include a plurality of opposed peak and valley portions which enable them to interlock and grip the web along a line of contact. The system and method also includes a flow bar system to reduce false detections of a web break. A blow-down bar is also used to force air, or some other fluid, downward on a broken web so as to harmlessly force the broken web to the ground as it exits the web tensioning device. A series of sensors which project two beams in the form of a crossing pattern are utilized to more rapidly and accurately detect a web break.

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Web Catcher Manual, Rev A, Item #A71669, Watch Tower Bible and Tract Society of Pennsylvania, Nov. 11, 1992.

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