Automatic document feeding apparatus

Details Automatic document feeding apparatus Automatic document feeding apparatus

1993-11-24

1995-01-24

Braun, Fred L.

Photocopying

Contact printing

Light boxes

271110, 271121, 271262, 355311, G03G 2100, B65H 708, B65H 714

Patent

active

053846311

ABSTRACT:
An automatic document feeding apparatus including pickup rollers for picking up documents, a document feed limiting device for limiting the number of documents to one when two or more documents are picked up by the pickup rollers, and a document thickness detecting sensor for detecting the number of documents passing through the document feed limiting device as a thickness of the documents. When the sensor detects that two or more documents has been fed, the document feed limiting device is rotated reversely to return the documents upstream in the document feeding direction. The returned documents are supplied again to the document feed limiting device by the pickup rollers. The document limiting device repeats its own operation until the number of documents is limited to one. If the sensor detects that the number of documents is one, the document is supplied through the document feed limiting device.

REFERENCES:
patent: 4954848 (1990-09-01), Arima
patent: 5011127 (1991-04-01), Hamilton et al.
patent: 5029837 (1991-07-01), Uchiyama
patent: 5039080 (1991-08-01), Kato et al.
patent: 5050854 (1991-09-01), Tajima
patent: 5076563 (1991-12-01), Namba et al.
patent: 5172899 (1992-12-01), Tajima

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