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US 12,656,715 B2Granted
Fixing device
AssigneeToshiba Tec Kabushiki Kaisha
InventorKousei Miyashita
Life of this patent
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Abstract
According to one embodiment, a fixing device capable of extending a lifespan of a component is provided. A fixing device of an embodiment includes a cylindrical body, a pressure roller, an adjustment mechanism, and a control section. The pressure roller can come into contact with the cylindrical body to form a nip. The adjustment mechanism can adjust a pressing force of the pressure roller against the cylindrical body. The control section controls the adjustment mechanism so that a first pressing force is realized as the pressing force when the pressure roller rotates at a first speed. The control section controls the adjustment mechanism so that a second pressing force smaller than the first pressing force is realized as the pressing force when the pressure roller rotates at a second speed greater than the first speed.
Claims17
A fixing device, comprising:
- a cylindrical body;
- a pressure roller configured to contact the cylindrical body to form a nip;
- an adjustment mechanism configured to adjust a pressing force of the pressure roller against the cylindrical body;
- and
- a control section for controlling the adjustment mechanism so that a first pressing force is realized as the pressing force when the pressure roller rotates at a first speed, and a second pressing force smaller than the first pressing force is realized as the pressing force when the pressure roller rotates at a second speed greater than the first speed, wherein
- a drive component is provided on a first side of the pressure roller in an axial direction to rotate the pressure roller,
- when a side opposite to the first side in the axial direction is defined as a second side in the axial direction,
- the adjustment mechanism includes a first adjustment mechanism that adjusts the pressing force on the first side in the axial direction of the pressure roller, and a second adjustment mechanism that adjusts the pressing force on the second side in the axial direction of the pressure roller,
- the first adjustment mechanism realizes the second pressing force on the first side in the axial direction of the pressure roller when the pressure roller rotates at the second speed, and
- the second adjustment mechanism realizes a fourth pressing force greater than the second pressing force on the second side in the axial direction of the pressure roller when the pressure roller rotates at the second speed.
7 more elements
An image forming apparatus, comprising:
- a scanner section;
- a sheet supply section;
- a conveying section;
- a reversing component;
- a control panel;
- and
- an image forming section comprising:
- a fixing device, comprising:
- a cylindrical body;
- a pressure roller configured to contact the cylindrical body to form a nip;
- an adjustment mechanism configured to adjust a pressing force of the pressure roller against the cylindrical body;
- and
- a control section for controlling the adjustment mechanism so that a first pressing force is realized as the pressing force when the pressure roller rotates at a first speed, and a second pressing force smaller than the first pressing force is realized as the pressing force when the pressure roller rotates at a second speed greater than the first speed, wherein
- a drive component is provided on a first side of the pressure roller in an axial direction to rotate the pressure roller,
- when a side opposite to the first side in the axial direction is defined as a second side in the axial direction,
- the adjustment mechanism includes a first adjustment mechanism that adjusts the pressing force on the first side in the axial direction of the pressure roller, and a second adjustment mechanism that adjusts the pressing force on the second side in the axial direction of the pressure roller,
- the first adjustment mechanism realizes the second pressing force on the first side in the axial direction of the pressure roller when the pressure roller rotates at the second speed, and
- the second adjustment mechanism realizes a fourth pressing force greater than the second pressing force on the second side in the axial direction of the pressure roller when the pressure roller rotates at the second speed.
15 more elements
A method for operating a fixing device, comprising:
- contacting a cylindrical body with a pressure roller to form a nip;
- adjusting a pressing force of the pressure roller against the cylindrical body;
- and
- controlling the adjusting so that a first pressing force is realized as the pressing force when the pressure roller rotates at a first speed, and a second pressing force smaller than the first pressing force is realized as the pressing force when the pressure roller rotates at a second speed greater than the first speed, wherein
- a drive component is provided on a first side of the pressure roller in an axial direction to rotate the pressure roller,
- when a side opposite to the first side in the axial direction is defined as a second side in the axial direction,
- adjusting comprises a first adjusting that adjusts the pressing force on the first side in the axial direction of the pressure roller, and a second adjusting that adjusts the pressing force on the second side in the axial direction of the pressure roller,
- the first adjusting realizes the second pressing force on the first side in the axial direction of the pressure roller when the pressure roller rotates at the second speed, and
- the second adjusting realizes a fourth pressing force greater than the second pressing force on the second side in the axial direction of the pressure roller when the pressure roller rotates at the second speed.
6 more elements
Dependencies are inferred from the claim text.