| US 7,580,646 B2 | ||
| Image forming apparatus and control method therefor | ||
| Eiichi Motoyama, Shinjuku-ku (Japan); Yoshihito Osari, Chuo-ku (Japan); Kuniyasu Kimura, Toride (Japan); Hiroaki Tomiyasu, Toride (Japan); Takahiko Yamaoka, Kashiwa (Japan); and Yuichi Yamamoto, Abiko (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, (Japan) | ||
| Filed on Apr. 18, 2008, as Appl. No. 12/105,935. | ||
| Application 12/105935 is a continuation of application No. 11/442945, filed on May 30, 2006, granted, now 7,379,678. | ||
| Claims priority of application No. 2005-159859 (JP), filed on May 31, 2005. | ||
| Prior Publication US 2008/0205913 A1, Aug. 28, 2008 | ||
| Int. Cl. G03G 21/00 (2006.01); G03G 15/00 (2006.01); B65H 29/00 (2006.01); B41J 29/38 (2006.01) | ||
| U.S. Cl. 399—16 [399/361; 399/401; 270/278; 270/291; 270/186] | 10 Claims |
| 1. An image forming apparatus comprising:
a sheet feeding device that feeds a transfer material;
a receiving device that receives image data;
an image forming device that forms an image on a first side and a second side of the fed transfer material based on the image
data received by said receiving device;
an inversion device that feeds the transfer material having the image formed on the first side thereof until the transfer
material is partly exposed to outside of the image forming apparatus and then feeds the transfer material to a refeeding path
in the image forming apparatus for image formation on the second side of the transfer material;
a pullout detecting device that detects whether or not the transfer material is pulled out before the feeding of the transfer
material by said inversion device is completed, and detects a degree of pulling out of the transfer material; and
a warning device that warns of the pulling out of the transfer material when the pulling out of the transfer material is detected
by said pullout detecting device,
wherein said warning device changes type of the warning according to the detected degree.
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