Sindoricoh Co., Ltd.

Young J Kwon

Seung M Chang

Jae H Chung

Young S Park

Dong S Joo

An automatic document feeder installed on a copying machine. This document feeder is constructed such that one reversible motor provides the drive power for all of drive parts of the document feeder, that is, a document feeding part, a document conveying part and a document recovering part, thus substantially reducing the manufacturing cost of the feeder. The document conveyor belt, on which a document to be copied is closely laid, moves in the forward and reversed direction, thereby causing the document to be exactly set on a reference copying position of a contact glass of the copying machine and, in this respect, improving the operational efficiency of the automatic document feeder. The present invention also provides a control circuit for automatically controlling such an automatic document feeder. The circuit comprises a microprocessor useful for efficiently controlling the operations of the document feeder even in the case of feeding of documents having different sizes and in the case of addition of other operational functions to the document feeder. Furthermore, this document feeder is provided with a document separating belt, which selectively moves and closely contacts with a document separating roller, thus improving the document separating efficiency and lengthening the using life of the document feeding part.

Automatic document feeders for copying machines and method for

An automatic document feeder (ADF) with a solid bracket suitable for use with an office machine to separate a plurality of documents one by one, and to feed the separated document to the office machine. The solid bracket comprises a pair of side plates, a stationary belt supporter and a shaftless roller supporter extending between the side plates, and a pair of spring supporters connected to the side plates through individual bent connections. The ADF further includes a rotatable shaft supporting the belt and controlling the tensile force of the belt, and a document separating roller coming into close contact with the belt at a position opposed to a shaftless roller. The tension coil springs are connected between the rotatable shaft and the spring supporters to bias the rotatable shaft and to control the tensile force of the belt. The endless document separating belt is rotatably supported by both the stationary belt supporter and the rotatable shaft. The shaftless roller is supported by the shaftless roller supporter such that it comes into contact with inner surface of the belt while freely shifting upwards and downwards.

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Sungbuk, South Korea

Young J Kwon