Device for checking conditions of a strip of wrapping material t

Details Device for checking conditions of a strip of wrapping material t Device for checking conditions of a strip of wrapping material t

1988-12-07

1990-05-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250561, G01J 132, G01N 2186

Patent

active

049220900

ABSTRACT:
The device for checking the feed conditions of a strip of wrapping material comprises a photodiode and a phototransistor arranged on opposite sides of the strip. A circuit block including a negative feedback is connected between the phototransistor and the photodiode to cause the phototransistor to work in a linear manner. The circuit block comprises an amplifier for amplifying the output signal of phototransistor to feed a check signal to the photodiode and to obtain from said photodiode a signal indicating anomaly conditions in the feed of the strip.

REFERENCES:
patent: 3812372 (1974-05-01), Wirtz et al.
patent: 3931513 (1976-01-01), Germain
patent: 4488808 (1984-12-01), Kato
patent: 4721850 (1988-01-01), Sakai et al.
patent: 4724481 (1988-02-01), Nishioka
patent: 4743749 (1988-05-01), Grundy
patent: 4752897 (1988-06-01), Zoeller et al.

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