Method for setting a sensor which detects the edge of a moving w

Details Method for setting a sensor which detects the edge of a moving w Method for setting a sensor which detects the edge of a moving w

1993-02-10

1994-04-05

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250557, G01N 2186

Patent

active

053007875

ABSTRACT:
In a web movement control device with a sensor which detects the edge of a moving web of material in a contact-free manner and can be adjusted by a sensor adjustment device, to compensate for a change of material to be controlled and/or a soiling of sensors, the sensor adjustment device is driven by an electronic signal processing device to adjust movement transversely with respect to the edge of the web. The signal processing device monitors the sensor signal changes which occur and derives a bright value or a dark value from the absence of a signal change during the movement adjustment stores the value. An intermediate value is calculated from the stored value as a control value for web movement control and stored. Under given operating conditions, this program cycle is repeated. Thereafter, the intermediate value determined in this process is compared with the originally detected value and, if a difference results, a correction factor is calculated by wherein the last intermediate value detected is corrected to match the originally detected control value.

REFERENCES:
patent: 3495089 (1970-02-01), Brown
patent: 3625048 (1971-12-01), Roitel
patent: 3655989 (1972-04-01), Robinson
patent: 3746451 (1973-07-01), Croissant et al.
patent: 4110627 (1978-08-01), Isherwood
patent: 4146797 (1979-03-01), Nakagawa
patent: 4991761 (1991-02-01), Gnuechtel et al.
patent: 5119981 (1992-06-01), Gnuechtel et al.

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