| US 7,570,897 B2 | ||
| Duplex image forming apparatus and method with control for ejecting different size recording sheet | ||
| Hironobu Nihei, Numazu (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Mar. 22, 2006, as Appl. No. 11/385,649. | ||
| Claims priority of application No. 2005-112469 (JP), filed on Apr. 08, 2005. | ||
| Prior Publication US 2006/0228126 A1, Oct. 12, 2006 | ||
| Int. Cl. G03G 15/00 (2006.01) | ||
| U.S. Cl. 399—82 [399/389; 399/401] | 5 Claims |
| 1. An image forming apparatus comprising:
an image forming section for carrying out image formation on recording paper;
a duplex conveying section for refeeding to said image forming section the recording paper having its first side undergo the
image formation to perform image formation on a second side of the recording paper;
an ejecting section to which the recording paper after the image formation is ejected;
a detecting section for detecting the size of the recording paper; and
a control section for controlling image formation, when performing image formation on both sides of a plurality of recording
papers, so as to undergo the image formation on the first side of a second recording paper fed after a first recording paper
prior to the image formation on the second side of the first recording paper by the image forming section, wherein
the control section controls, when an error occurs indicating the length of the second recording paper is different from a
predetermined length, so as to reverse the second recording paper through the duplex conveying section irrespective of the
length of the second recording paper to perform image formation on the second side of the first recording paper by the image
forming section, and to eject the second recording paper from the ejecting section after the first recording paper without
performing the image formation.
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