Back to results
US 8,078,090 B2Granted
Transfer device and image forming apparatus including the same
AssigneeSeiko Epson Corporation
InventorTomoyuki Shiiya
Life of this patent
Estimating the term…
Abstract
A transfer device includes: a first transfer belt; a first and second roller on which the first transfer belt is wound; a second transfer belt which makes contact with the first transfer belt; a third roller on which the second transfer belt is wound, and which makes contact with the first roller via the first transfer belt and the second transfer belt; a fourth roller on which the second transfer belt is wound, and which makes contact with the second roller via the first transfer belt and the second transfer belt; a first drive force transmission mechanism which transmits a drive force to the first roller; and a second drive force transmission mechanism which transmits a drive force to the third roller.
Claims13
A transfer device comprising:
- a first transfer belt onto which is transferred an image;
- a first roller and a second roller on which the first transfer belt is wound;
- a second transfer belt that makes contact with the first transfer belt;
- a third roller on which the second transfer belt is wound, and that makes contact with the first roller via the first transfer belt and the second transfer belt;
- a fourth roller on which the second transfer belt is wound, and that makes contact with the second roller via the first transfer belt and the second transfer belt;
- a first drive force transmission mechanism that transmits a drive force to the first roller;
- a second drive force transmission mechanism that transmits a drive force to the third roller;
- and
- a drive force controller that controls the second drive force transmission mechanism in such a way that a relationship between a belt movement speed V2 of the second transfer belt and a belt movement speed V1 of the first transfer belt is V2/V1=a (where a is a constant of 1 or less).
6 more elements
A transfer device comprising:
- a first transfer belt onto which is transferred an image;
- a first roller and a second roller on which the first transfer belt is wound;
- a second transfer belt that makes contact with the first transfer belt;
- a third roller on which the second transfer belt is wound, and that makes contact with the first roller via the first transfer belt and the second transfer belt;
- a fourth roller on which the second transfer belt is wound, and that makes contact with the second roller via the first transfer belt and the second transfer belt;
- a first drive force transmission mechanism that transmits a drive force to the first roller;
- a second drive force transmission mechanism that transmits a drive force to the third roller;
- and
- a variable contact pressure mechanism that makes variable a contact pressure of the third roller against the first roller via the first transfer belt and the second transfer belt, or a contact pressure of the fourth roller against the second roller via the first transfer belt and the second transfer belt;
- and
- a contact pressure controller that controls the variable contact pressure mechanism.
8 more elements
A transfer device comprising:
- a first transfer belt onto which is transferred an image;
- a first roller and a second roller on which the first transfer belt is wound;
- a second transfer belt that makes contact with the first transfer belt;
- a third roller on which the second transfer belt is wound, and that makes contact with the first roller via the first transfer belt and the second transfer belt;
- a fourth roller on which the second transfer belt is wound, and that makes contact with the second roller via the first transfer belt and the second transfer belt;
- a first drive force transmission mechanism that transmits a drive force to the first roller;
- and
- a second drive force transmission mechanism that transmits a drive force to the third roller,
- wherein the second drive force transmission mechanism has a one-way clutch.
6 more elements
A transfer device comprising:
- a first transfer belt onto which is transferred an image;
- a first roller and a second roller on which the first transfer belt is wound;
- a second transfer belt that makes contact with the first transfer belt;
- a third roller on which the second transfer belt is wound, and that makes contact with the first roller via the first transfer belt and the second transfer belt;
- a fourth roller on which the second transfer belt is wound, and that makes contact with the second roller via the first transfer belt and the second transfer belt;
- a first drive force transmission mechanism that transmits a drive force to the first roller;
- a second drive force transmission mechanism that transmits a drive force to the third roller;
- and
- a bias application unit that applies a transfer bias to the third roller, whereby the first roller is grounded.
6 more elements
An image forming apparatus comprising:
- an image carrier on which a latent image is formed;
- a developing unit that develops the latent image with a liquid developer;
- a first transfer belt to which an image developed by the developing unit is transferred;
- a first roller and a second roller on which the first transfer belt is wound;
- a second transfer belt that makes contact with the first transfer belt;
- a third roller on which the second transfer belt is wound, and that makes contact with the first roller via the first transfer belt and the second transfer belt;
- a fourth roller on which the second transfer belt is wound, and that makes contact with the second roller via the first transfer belt and the second transfer belt;
- a first drive force transmission mechanism that transmits a drive force to the first roller;
- a second drive force transmission mechanism that transmits a drive force to the third roller;
- and
- a drive force controller that controls the second drive force transmission mechanism in such a way that a relationship between a belt movement speed V2 of the second transfer belt and a belt movement speed V1 of the first transfer belt is V2/V1=a (where a is a constant of 1 or less).
8 more elements
An image forming apparatus comprising:
- an image carrier on which a latent image is formed;
- a developing unit that develops the latent image with a liquid developer;
- a first transfer belt to which an image developed by the developing unit is transferred;
- a first roller and a second roller on which the first transfer belt is wound;
- a second transfer belt that makes contact with the first transfer belt;
- a third roller on which the second transfer belt is wound, and that makes contact with the first roller via the first transfer belt and the second transfer belt;
- a fourth roller on which the second transfer belt is wound, and that makes contact with the second roller via the first transfer belt and the second transfer belt;
- a first drive force transmission mechanism that transmits a drive force to the first roller;
- a second drive force transmission mechanism that transmits a drive force to the third roller;
- a variable contact pressure mechanism that makes variable a contact pressure of the third roller against the first roller via the first transfer belt and the second transfer belt, or a contact pressure of the fourth roller against the second roller via the first transfer belt and the second transfer belt;
- and
- a contact pressure controller that controls the variable contact pressure mechanism.
9 more elements
Dependencies are inferred from the claim text.