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US 7,010,246 B2Granted
Image forming apparatus, drum unit, image forming module, and method of insertion and removal of a damper into and from an image carrier drum
AssigneeRicoh Company, Ltd.
InventorsTakatsugu Fujishiro, Takeo Suda, Hideki Zemba, Hisao Murayama
Life of this patent
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Abstract
An image forming apparatus includes a photoreceptor belt formed by either a belt or a thin-walled cylinder. A charging unit that sets bias characteristics of the photoreceptor belt has an arrangement to approach towards the photoreceptor belt. A damper is provided on a side of the photoreceptor belt opposite to the side facing the charging unit. The damper absorbs vibrations in the photoreceptor belt through a supporting plate.
Claims14
A drum unit, comprising:
- a cylinder;
- a shaft that extends inside and supports the cylinder;
- and
- a damper disposed inside the cylinder in pressed contact with an inner wall surface of the cylinder and fixed to the inner wall due to elasticity, wherein
- the cylinder, the shaft, and the damper are assembled such that when the shaft is pulled out from the cylinder, the damper moves in the axial direction of the cylinder together with the shaft.
2 more elements
A drum unit, comprising:
- a cylinder;
- a shaft that extends inside and supports the cylinder;
- and
- a damper disposed inside the cylinder, wherein
- the cylinder, the shaft, and the damper are assembled such that when the shaft is pulled out from the cylinder, the damper moves in the axial direction of the cylinder together with the shaft and is removed from the cylinder;
- wherein the shaft has a protrusion in radial direction and away from a center of the shaft, the damper has a contacting portion that comes in contact with the protrusion when the shaft is pulled out from the cylinder.
3 more elements
A drum unit, comprising:
- a cylinder;
- a shaft that extends inside and supports the cylinder;
- and
- a damper disposed inside the cylinder, wherein
- the cylinder, the shaft, and the damper are assembled such that when the shaft is pulled out from the cylinder, the damper moves in the axial direction of the cylinder together with the shaft and is removed from the cylinder;
- wherein the mechanism is such that each end in the axial direction of the cylinder has a pair of flanges fitted respectively, the cylinder is supported by the shaft through these flanges, the damper moves in the axial direction of the cylinder and comes in contact with one of the flanges, and the flange is separated apart from the cylinder by pushing.
3 more elements
An image forming module, comprising:
- an image carrier drum;
- a shaft that extends inside and supports the drum;
- a damper disposed inside the drum in pressed contact with an inner wall surface of the drum and fixed to the inner wall surface due to elasticity, wherein the drum, the shaft, and the damper are assembled such that when the shaft is pulled out from the drum, the damper moves in the axial direction of the drum together with the shaft;
- and
- an image forming element that forms an image on the drum, wherein
- the image carrier drum and the image forming element are assembled together as an integrated assembly.
3 more elements
An image forming apparatus comprising:
- an image carrier drum;
- a shaft that extends inside and supports the drum;
- and
- a damper disposed inside the drum in pressed contact with an inner wall surface of the drum and fixed to the inner wall surface due to elasticity, wherein the drum, the shaft, and the damper are assembled such that when the shaft is pulled out from the drum, the damper moves in the axial direction of the drum together with the shaft.
1 more element
An image carrier drum assembly, comprising:
- an image carrier drum;
- a shaft that extends inside and supports the image carrier drum;
- and
- a damper disposed inside the image carrier drum, wherein the damper is configured to have a tangent of loss tan δ of at least 0.5.
1 more element
Dependencies are inferred from the claim text.