Document feeder which properly positions a document on the plate

Details Document feeder which properly positions a document on the plate Document feeder which properly positions a document on the plate

1990-07-06

1991-10-15

Olszewski, Robert P.

Sheet feeding or delivering

Feeding

With means to align sheet

271 3, 271265, B65H 714

Patent

active

050567756

ABSTRACT:
An automatic document feeder includes a document delivery belt for conveying a document, a pulse output switch for supplying pulses in synchronism with driving of the belt, and a counter for counting the number of the pulses supplied. The extent that the delivery belt is driven is roughly controlled on the basis of the number of pulses supplied from the pulse output switch. After a predetermined number of pulses have been provided, the driving of the delivery belt is controlled according to time. According to the time control, the delivery belt is driven for a constant time period. The number of the pulses supplied during this constant time period is counted. If the counted value is different from a predetermined reference value, the delivery belt is driven until the counted value reaches the reference value. The delivery belt is thus controlled to accurately set the document in a predetermined position.

REFERENCES:
patent: 4455018 (1984-06-01), Colglazier et al.
patent: 4621799 (1986-11-01), Bastow et al.
patent: 4713674 (1987-12-01), Giezeman et al.
patent: 4791451 (1988-12-01), Hirose et al.
patent: 4825248 (1989-04-01), Honjo et al.
patent: 4939676 (1990-07-01), Worsley et al.
patent: 4982228 (1991-01-01), Watanabe
Avritt, M. D., "Document Feeder with Center Referencing", IBM Technical Disclosure Bulletin, vol. 24, No. 9, pp. 4612 (2-1982).

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