Web monitoring and control apparatus for web handling machinery

Details Web monitoring and control apparatus for web handling machinery Web monitoring and control apparatus for web handling machinery

1977-10-13

1980-01-29

Dahl, Lawrence J.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

28187, 57 81, 242 57, 250572, G01N 2130

Patent

active

041863097

ABSTRACT:
An improved web monitoring and control apparatus is disclosed for use with web handling machinery, such as printing presses and the like which are of the type that have a generally continuous web of material being printed or otherwise processed. The apparatus directs modulated infrared energy onto the web and detects the reflection of the energy from the web. The apparatus detects the occurrence of a web break and shuts down the machinery. The apparatus includes an automatic arming control which activates the apparatus when the machinery moves the web at some preselected percentage of its total speed and also includes apparatus for detecting when the detector lens has become soiled and provides a warning to the operators that conditions are approaching which may result in a false web break detection which would shut down the machinery.

REFERENCES:
patent: 2451816 (1948-10-01), Dunn
patent: 3906232 (1965-09-01), Meihofer

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