公开(公告)号：JPH0316366A

公开(公告)日：1991-01-24

申请号：JP12894089

申请日：1989-05-24

Applicant: IBM JAPAN

Inventor： FUJINO TAKANE

IPC: G03B27/52 ,  G03B27/62 ,  G03G15/04 ,  H04N1/00 ,  H04N1/10 ,  H04N1/107 ,  H04N1/193

Abstract: PURPOSE:To simplify the constitution by inhibiting the drive of a friction roller while the friction roller is moved from a home position to a scanning start position with a unidirectional clutch and allowing the drive of the friction roller while in the movement reaching the home position. CONSTITUTION:While a friction roller 9 is moved from the home position to the scanning start position, a unidirectional clutch 10 inhibits the drive of the friction roller 9. Thus, the tip of a document is engaged with the friction roller 9 not driven, and the document is moved as both an image sensor unit 2 and a document feed unit 3 are moved toward the scanning start position. When both the image sensor unit 2 and the document feed unit 3 are stopped at the scanning start position, the document is placed at a scheduled position of a glass platen 4. While the friction roller 9 is moved from the home position to the scanning start position, the unidirectional clutch 10 allows the rotation of the friction roller 9, the friction roller 9 is driven freely on the document without moving the document and the document stayed at the scheduled position is scanned by the image sensor unit 2. Thus, the constitution is simplified.