Web wrap detection system for an offset web printing press

Details Web wrap detection system for an offset web printing press Web wrap detection system for an offset web printing press

1989-02-13

1990-10-30

Fisher, J. Reed

Printing

Multicolor

Rotary machines

101228, B41F 506, B41F 522

Patent

active

049660748

ABSTRACT:
A reliable, fast-acting, web wrap detection system is disclosed which is particularly useful inn an offset printing press for stopping operation thereof quickly enough to prevent the web from wrapping around a blanket cylinder. The preferred detection system includes optical sensors which sense blanket cylinder surface reflectance and which stop printing press operation upon an increase in reflectance, such being indicative that the higher reflectance printing web has begun to wrap the cylinder which occurs when the web breaks.

REFERENCES:
patent: 3096233 (1963-07-01), Rappaport
patent: 3928844 (1975-12-01), Meihofer
patent: 4078487 (1978-03-01), McComb

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