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US 9,436,149 B2Granted
Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorKoichi Tanaka
Life of this patent
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Abstract
An image forming apparatus includes a speed reduction device including a first gear and a second gear meshing each other. A ratio between teeth of the first gear and teeth of the second gear is an integer. One of the first gear and the second gear has a large diameter, and the other has a small diameter. The entire gear or the teeth of the gear having the large diameter is formed of a material having a higher modulus of longitudinal elasticity than a modulus of longitudinal elasticity of the gear having the small diameter.
Claims2
An image forming apparatus comprising:
- a plurality of first image bearing members;
- a second bearing member, onto which an image formed on each of the first bearing members is transferred;
- a driving roller configured to rotate the second bearing member;
- a drive source;
- a first gear which includes teeth which are configured of a resin material to transmit a driving force from the drive source;
- a second gear which includes teeth which are configured of a metallic material to transmit the driving force from the first gear to the driving roller by meshing with the first gear,
- wherein the second gear is established so that a number of the teeth of the second gear is larger than a number of the teeth of the first gear, and is equal to the integral multiple of a number of the teeth of the first gear,
- wherein the first gear and the second gear transmit the power to the driving roller for driving the second bearing member, and
- wherein the first image bearing members are disposed at equal intervals L, and the interval L is an integer multiple of a peripheral length of the driving roller.
6 more elements
Dependencies are inferred from the claim text.