Device for controlling the lateral position of a web in a web pr

Details Device for controlling the lateral position of a web in a web pr Device for controlling the lateral position of a web in a web pr

1982-09-30

1985-07-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250557, G01H 2186

Patent

active

045270694

ABSTRACT:
Device for controlling with adjusting members and a measuring device the lateral position of a web in a web printing machine, the controlling device, for effecting centralized control, having respective optical scanning systems for detecting edges of the web on both sides thereof and the respective positions of the edges and, upon lateral shifting of the web, activating the adjusting members for correcting the position of the web in accordance with a nominal value, including a respective bandpass filter connected to each of the optical scanning systems, and means for detecting a long-term change in the control signal by the bandpass filter of one of the optical scanning systems, the one optical scanning system being in position yet being idle with respect to controlling the lateral position of the web, the other optical scanning system being active with respect to scanning the respective web edge for controlling the lateral position of the web, the detection of the long-term change in the control signal by the bandpass filter of the one optical scanning system being an indication of fouling of the optical scanning systems, whereby compensation for the fouling may be effected.

REFERENCES:
patent: 2623262 (1952-12-01), Berry
patent: 3604940 (1971-09-01), Matthews
patent: 3746451 (1973-07-01), Croissant et al.
patent: 4184080 (1980-01-01), Massey

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