| US 7,594,645 B2 | ||
| Sheet processing device and image formation apparatus | ||
| Toshimasa Suzuki, Kashiwa (Japan); Yusuke Obuchi, Abiko (Japan); Daisaku Kamiya, Abiko (Japan); Hitoshi Fujimoto, Abiko (Japan); Kiyoshi Watanabe, Kashiwa (Japan); Tomokazu Nakamura, Matsudo (Japan); Kenichi Hayashi, Abiko (Japan); Hideki Kushida, Moriya (Japan); and Atsuteru Oikawa, Kashiwa (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Feb. 24, 2005, as Appl. No. 11/66,131. | ||
| Claims priority of application No. 2004-055559 (JP), filed on Feb. 27, 2004. | ||
| Prior Publication US 2005/0189688 A1, Sep. 01, 2005 | ||
| Int. Cl. B65H 37/04 (2006.01) | ||
| U.S. Cl. 270—37 [270/32; 270/58.07; 270/58.09] | 16 Claims |
| 11. An image formation apparatus, comprising:
an image forming unit configured to form an image on a sheet;
a sheet processing device operable to process a sheet bundle having a folded back portion; and
a control unit controlling the sheet processing device,
the sheet processing device including:
a pair of conveying rollers, having a periphery with a notch formed by first and second flat faces that intersect one another,
configured to convey the sheet bundle; and
a pressing unit configured to press the folded back portion of the sheet bundle gripped by the pair of conveying rollers,
wherein the control unit controls a rotation of the pair of conveying rollers to stop conveying the sheet bundle when the
folded back portion protrudes from the pair of conveying rollers by a predetermined amount, and controls the rotation of the
pair of conveying rollers such that when the folded back portion is protruding from the pair of conveying rollers by the predetermined
amount, the first flat face is positioned facing the pressing unit and the second flat face is positioned to grip the sheet
bundle, and
wherein the pressing unit presses the folded back portion protruding from the pair of conveying rollers while the pair of
conveying rollers is stopped and is gripping the sheet bundle.
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