| US 7,469,123 B2 | ||
| Image forming apparatus | ||
| Toru Tanjo, Nagano (Japan) | ||
| Assigned to Seiko Epson Corporation, Tokyo (Japan) | ||
| Filed on Sep. 28, 2005, as Appl. No. 11/239,670. | ||
| Claims priority of application No. P2004-283949 (JP), filed on Sep. 29, 2004. | ||
| Prior Publication US 2006/0067761 A1, Mar. 30, 2006 | ||
| Int. Cl. G03G 15/00 (2006.01) | ||
| U.S. Cl. 399—396 [399/388; 399/401] | 2 Claims |
| 1. An image forming apparatus, comprising:
an intermediate transfer member;
an image forming portion adapted to form a monochrome image on the intermediate transfer member by rotating the intermediate
transfer member at one time, and to superpose a plurality of monochrome images on the intermediate transfer member by rotating
the intermediate transfer member at plural times to form a multi-color image on the intermediate transfer member;
a transfer portion adapted to transfer the image formed on the intermediate transfer member to a sheet delivered with a first
speed;
a fixing portion adapted to fix the transferred image onto the sheet; and
a switchback portion adapted to switch back the sheet that has passed through the fixing portion so as to return the sheet
to the transfer portion through a return path with a second speed, for forming the image on a second face of the sheet, after
the image has been fixed on a first face of the sheet, wherein:
the second speed is equal to or lower than the first speed when the image formed in the image forming portion to be transferred
on the second face of the sheet is a multi-color image; and
the second speed is greater than the first speed when the image formed in the image forming portion to be transferred on the
second face of the sheet is a monochrome image.
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