Photocopying – Contact printing – Light boxes
Patent
1990-05-22
1991-01-01
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355 75, 355230, 355309, 358497, 358498, G03G 1528, G03G 2100
Patent
active
049822357
ABSTRACT:
The invention comprises an image scan apparatus wherein a simple document feed unit is provided for feeding a document to be scanned to a predetermined position on a glass platen. The document feed unit is mechanically coupled to an image sense unit which is reciprocally moved between a home position and a scan start position. The document feed unit includes a frictional roller which is in contact with the glass platen. A leading edge of the document is inserted by an operator at a home position between a frictional roller and the glass platen. The frictional roller is mounted on a shaft via a one-way clutch or one-way bearing. The one-way clutch inhibits the rotation of the frictional roller during its movement from the home position to a scan start position. The leading portion of the document is engaged by the frictional roller, and the document is fed to a predetermined position on the glass platen as the frictional roller and the image sense unit are moved to the scan start position. The one-way clutch allows the rotation of the frictional roller during a reverse movement from the scan start position back to the home position, while the document is being scanned. During this movement, the frictional roller freely rotates over the document without moving it.
REFERENCES:
patent: 3947111 (1976-03-01), Hoppner
patent: 4561771 (1985-12-01), Sugiura
patent: 4722518 (1988-02-01), Wantanabe
patent: 4865305 (1989-09-01), Momiyama et al.
patent: 4893196 (1990-01-01), Koshiyouji et al.
Grimley A. T.
International Business Machines Corp.
Stanzione Patrick
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