| US 7,570,895 B2 | ||
| Image forming apparatus having heat-fixing unit | ||
| Atsutoshi Ando, Yokohama (Japan); Yuuichi Obara, Shizuoka-ken (Japan); and Hiroshi Sahara, Susono (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Feb. 21, 2007, as Appl. No. 11/677,287. | ||
| Claims priority of application No. 2006-048999 (JP), filed on Feb. 24, 2006. | ||
| Prior Publication US 2007/0201892 A1, Aug. 30, 2007 | ||
| Int. Cl. G03G 15/20 (2006.01) | ||
| U.S. Cl. 399—68 | 5 Claims |
| 1. An image forming apparatus for forming an image on a recording material, comprising:
an image forming portion for forming an unfixed image on the recording material;
a fixing portion having a fixing nip portion which heats and fixes the unfixed image onto the recording material,
wherein if the recording material is plain paper in which a size in a direction which perpendicularly crosses a conveying
direction is smaller than a predetermined size, the fixing portion conveys the plain paper at a speed lower than that in the
case where the recording material is plain paper in which a size in the direction which perpendicularly crosses the conveying
direction is equal to or larger than the predetermined size; and
a discharge roller which discharges the recording material that has passed through the fixing nip portion toward a tray and
which has a projection for kicking out the recording material in an area where the plain paper smaller than the predetermined
size does not pass,
wherein a length of conveying path between the fixing nip portion and the discharge roller is smaller than a length in the
conveying direction of the plain paper smaller than the predetermined size, and
wherein in the case where the recording material is the plain paper which is equal to or larger than the predetermined size,
the discharge roller conveys the plain paper in a range from a front edge to a rear edge in the conveying direction of one
sheet of the plain paper at a predetermined speed, in the case where the recording material is the plain paper smaller than
the predetermined size, the discharge roller conveys the plain paper at a first speed until the rear edge in the conveying
direction of the plain paper passes through the fixing nip portion, and the discharge roller conveys the plain paper at a
second speed higher than the first speed after the rear edge in the conveying direction of the plain paper passed through
the fixing nip portion.
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