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US 6,603,942 B2Granted
Image forming apparatus having belt-shaped carrier
AssigneesHitachi, Ltd., Hitachi Koki Co., Ltd.
InventorsKenji Asuwa, Kazutaka Sato, Masahiro Yagi, Isao Nakajima, Yukio Otome, Akihiko Yamazaki
Life of this patent
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Abstract
An image forming apparatus has an endless belt which serves as an image carrier is characterized by reduced image misregistration and reduced machining cost. When the endless belt feed path is divided into a path from a drive roller to a tension roller, and a path from the tension roller to the drive roller, the eccentricity of an idle roller located on the path on the side including a latent image forming point is set to a value smaller than that of an idle roller located on the path not including the image forming point.
Claims7
An image forming apparatus, comprising:
- a belt-shaped carrier supported for movement on a drive roller, multiple idler rollers and a tension roller;
- a latent image forming apparatus mounted on said belt shaped carrier;
- a developing apparatus for applying toner on a latent image formed by said latent image forming apparatus on said belt-shaped carrier;
- and
- a transfer apparatus for transferring the toner image formed by said developing apparatus;
- wherein, when a path leading from said drive roller to said tension roller in a forward direction of movement of said belt-shaped carrier is defined as a drive roller downstream path, and a path leading from said tension roller to said drive roller is defined as a drive roller upstream path, the amount of eccentricity of any idle roller located on said drive roller downstream path is made smaller than that of the idle roller located on said drive roller upstream path, and
- wherein said latent image forming apparatus is arranged on said drive roller downstream path.
4 more elements
An image forming apparatus, comprising:
- a belt-shaped carrier supported for movement on a drive roller, multiple idler rollers and a tension roller
- a latent image forming apparatus mounted on said belt shaped carrier;
- a developing apparatus for applying toner on a latent image formed by said latent image forming apparatus on said belt-shaped carrier;
- and
- a transfer apparatus for transferring the toner image formed by said developing apparatus;
- wherein, when a path leading from said drive roller to said tension roller in a forward direction of movement of said belt-shaped carrier is defined as a drive roller downstream path, and a path leading from said tension roller to said drive roller is defined as a drive roller upstream path, the amount of eccentricity of any idle roller located on said drive roller upstream path is made smaller than that of any idle roller located on said drive roller downstream path, and
- wherein said latent image forming apparatus is arranged on said drive roller upstream path.
4 more elements
An image forming apparatus comprising:
- a belt-shaped intermediate transfer member supported for movement on a drive roller, multiple idler rollers and a tension roller;
- multiple monochromatic image forming means mounted on said belt-shaped intermediate transfer member,
- a first transfer apparatus for transferring, to said belt-shaped intermediate transfer member, a plurality of monochromatic toner images formed by said monochromatic image forming means;
- and
- a second transfer apparatus for transferring, to a recording medium, a color image obtained by overlaying said plurality of monochromatic toner images;
- wherein, when a path leading from said drive roller to said tension roller in the forward direction of movement of said belt-shaped carrier is defined as a drive roller downstream path, and a path leading from said tension roller to said drive roller is defined as a drive roller upstream path, the amount of eccentricity of any idle roller located on said drive roller downstream path is made smaller than that of any idle roller located on said drive roller upstream path, and
- wherein said latent image transfer point is arranged on said drive roller downstream path.
4 more elements
An image forming apparatus comprising:
- a belt-shaped intermediate transfer member supported for movement on a drive roller, multiple idler rollers and a tension roller;
- multiple monochromatic image forming means mounted on said belt-shaped intermediate transfer member;
- a first transfer apparatus for transferring, to said belt-shaped intermediate transfer member, a plurality of monochromatic toner images formed by said monochromatic image forming means;
- and
- a second transfer apparatus for transferring, to a recording medium, a color image obtained by overlaying said plurality of monochromatic toner images;
- wherein, when a path leading from said drive roller to said tension roller in the forward direction of movement of said belt-shaped carrier is defined as a drive roller downstream path, and a path leading from said tension roller to said drive roller is defined as a drive roller upstream path, the amount of eccentricity of any idle roller located on said drive roller upstream path is made smaller than that of any idle roller located on said drive roller downstream path, and
- wherein said latent image transfer point is arranged on said drive roller upstream path.
4 more elements
Dependencies are inferred from the claim text.