Single tray and multi tray misfeed detector with voltage respons

Details Single tray and multi tray misfeed detector with voltage respons Single tray and multi tray misfeed detector with voltage respons

1997-01-13

1998-11-17

Skaggs, H. Grant

Sheet feeding or delivering

Feeding

Multiple supplies

271 901, 271263, 27126504, 27126502, B65H 344

Patent

active

058365800

ABSTRACT:
A single tray or multi tray sheet feed system is provided. A sensor is provided to sense the sheets leaving from the single tray or multi tray system. If the paper weight of sheets of paper on a tray fall within a first range of paper weight values, the sensor is designed to have a first given voltage response condition for sensing these sheets and if the paper weight of the sheets falls within a second range of paper weight values the sensor is designed to have a second given voltage response condition for sensing the latter sheets. 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. A voltage response value sensed by the sensor of the first sheet fed from a tray is stored in memory as the voltage response value for all sheets on that particular tray. The voltage response value sensed by the same sensor of subsequent sheets fed from that particular tray is compared with the voltage response value in memory to detect a multi sheet feed from the tray.

REFERENCES:
patent: 5105078 (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
patent: 5769407 (1998-06-01), Hansen

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