Roller device, fixing device, and image forming apparatus
AssigneeSharp Kabushiki Kaisha
InventorsKousuke Namisaki, Kan Mukai
Life of this patent
Estimating the term…
Abstract
The cleaning member is disposed to be opposite to the first roller with the second roller being provided therebetween. Compared to a case when the second roller is placed at a first position on a side of the first roller, if the second roller is placed at a second position on a side of the cleaning roller, a pressure between the second roller and the first roller becomes smaller, and a pressure between the second roller and the cleaning member becomes larger.
Claims11
A fixing device comprising:
- a first roller;
- a second roller that is provided in contact with the first roller;
- a cleaning member that is provided in contact with the second roller to clean the second roller;
- a driver that drives the second roller swingingly relative to the first roller;
- and
- a controller that controls the driver, wherein
- the controller controls the driver to drive swingingly the second roller relative to the first roller so as to change a pressure between the second roller and the first roller and a pressure between the second roller and the cleaning member to a predetermined relationship in accordance with a position to which the second roller is driven swingingly, wherein
- the predetermined relationship according to the position to which the second roller is driven swingingly in such that
- when the second roller is driven swingingly to a first position on a side of the first roller, the pressure between the second roller and the first roller is a first roller pressure and the pressure between the second roller and the cleaning member is a first cleaning pressure, and
- when the second roller is driven swingingly to a second position on a side of the cleaning member, the pressure between the second roller and the first roller is a second roller pressure less than the first roller pressure, and the pressure between the second roller and the cleaning member is a second cleaning pressure larger than the first cleaning pressure.
A control method of a fixing device that includes a first roller, a second roller that is provided in contact with the first roller, and a cleaning member that is provided in contact with the second roller to clean the second roller, the member comprising:
- driving the first roller to rotate and driving the second roller swingingly relative to the first roller by a driver;
- and
- controlling the driver to drive swingingly the second roller relative to the first roller so as to change a pressure between the second roller and the first roller and a pressure between the second roller and the cleaning member to a predetermined relationship in accordance with a position to which the second roller is driven swingingly, wherein
- the predetermined relationship according to the position to which the second roller is driven swingingly in such that
- when the second roller is driven swingingly to a first position on a side of the first roller, the pressure between the second roller and the first roller is a first roller pressure and the pressure between the second roller and the cleaning member is a first cleaning pressure, and
- when the second roller is driven swingingly to a second position on a side of the cleaning member, the pressure between the second roller and the first roller is a second roller pressure less than the first roller pressure, and the pressure between the second roller and the cleaning member is a second cleaning pressure larger than the first cleaning pressure.
Dependencies are inferred from the claim text.