Misfeed detector with voltage response adjustment

Details Misfeed detector with voltage response adjustment Misfeed detector with voltage response adjustment

1997-01-13

1998-06-23

Skaggs, H. Grant

Sheet feeding or delivering

Delivering to stack and feeding therefrom

Intermediate tray

271 313, 271 901, 271 913, 271263, 27126504, B65H 522

Patent

active

057694079

ABSTRACT:
A sheet feed sensor is designed to have a first given voltage response condition for sensing sheets within a first range of paper weight values and a second given voltage response condition for sensing sheets within a second range of paper weight values. A current value supplied to the emitter of the sensor can be controlled to provide the desired voltage response or a resistance in a phototransistor collector circuit can be varied to provide the desired voltage response condition. If the first range of paper weight values is lighter than the second range of paper weight values, the sensor, when in the first given voltage response condition, will have a voltage response, when sensing a sheet of a given paper weight, which is higher than the voltage response when the same sensor senses a sheet of the same paper weight, when the sensor is in the second given voltage response condition. This way the difference between a voltage response at the phototransistor for a single sheet and a voltage response for two sheets, each of the same paper weight as the single sheet, fed through the sensor is large enough throughout all paper weight ranges to obviate the possibility of voltage response overlap.

REFERENCES:
patent: 5105073 (1992-04-01), Nochise et al.
patent: 5503382 (1996-04-01), Hansen et al.
patent: 5584472 (1996-12-01), Hidding et al.
patent: 5586755 (1996-12-01), Hansen et al.

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