Roller and fixing apparatus
AssigneeCanon Kabushiki Kaisha
InventorsNaoto Tsuchihashi, Toshiaki Miyashiro, Eiji Uekawa
Life of this patent
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Abstract
A roller used for a fixing apparatus has: a core; a first elastic layer that is formed outside the core and includes a first tapered portion on an edge of the roller in an axis direction; and a second elastic layer that is formed outside the first elastic layer and includes a second tapered portion on the edge in the axis direction on the same side as the first elastic layer, the second elastic layer having hardness that is higher than hardness of the first elastic layer. A second start point, which is a start point of the second tapered portion, is set in a position closer to the center of the roller in the axis direction than a first start point, which is a start point of the first tapered portion.
Claims14
A roller used for a fixing apparatus, comprising:
- a core;
- a first elastic layer that is formed outside the core and includes a first tapered port ion on an edge of the roller in an axis direction;
- and
- a second elastic layer that is formed outside the first elastic layer and includes a second tapered portion on the edge in the axis direction on the same side as the first elastic layer, the second elastic layer having hardness that is higher than hardness of the first elastic layer, wherein
- a second start point, which is a start point of the second tapered portion, is set in a position closer to the center of the roller in the axis direction than a first start point which is a start point of the first tapered portion.
A roller used for a fixing apparatus, comprising:
- a core;
- and
- an elastic layer that is formed outside the core, the elastic layer including a first elastic layer and a second elastic layer formed outside the first elastic layer and having hardness that is higher than hardness of the first elastic layer, wherein
- a tapered portion is formed on an edge of the elastic layer in an axis direction, and wherein
- the tapered portion has a region where a ratio of the thickness of the second elastic layer to the thickness of the first elastic layer decreases gradually as a posit ion approaches an edge of the roller in the axis direction on the side where the tapered portion is formed.
A roller used for a fixing apparatus, comprising:
- a core;
- a first elastic layer that is formed outside the core and includes a first tapered port ion on an edge of the roller in an axis direction;
- and
- a second elastic layer that is formed outside the first elastic layer and includes a second tapered portion on the edge in the axis direction on the same side as the first elastic layer, the second elastic layer having hardness that is higher than hardness of the first elastic layer, wherein
- a first start point, which is a start point of the first tapered portion, is set in a position closer to the center of the roller in the axis direction than a second start point, which is a start point of the second tapered portion.
A roller used for a fixing apparatus, comprising:
- a core;
- and
- an elastic layer that is formed outside the core, the elastic layer including a first elastic layer and a second elastic layer formed outside the first elastic layer and having hardness that is higher than hardness of the first elastic layer, wherein
- a tapered portion is formed on an edge of the elastic layer in the axis direction, and wherein
- the tapered portion has a region where a ratio of the thickness of the second elastic layer to the thickness of the first elastic layer increases gradually as a posit ion approaches the edge of the roller in the axis direction on the side where the tapered portion is formed.
A fixing apparatus that conveys and heats a recording material bearing a toner image at a nip portion, comprising:
- a heating rotating member;
- and
- a roller that contacts the heating rotating member and forms the nip portion, the roller including a core, a first elastic layer that is formed outside the core, and a second elastic layer formed outside the first elastic layer and having hardness that is higher than hardness of the first elastic layer, wherein
- a first tapered portion is formed on an edge of the first elastic layer in an axis direction of the roller, and a second tapered portion is formed on an edge of the second elastic layer in the axis direction, and wherein
- a second start point, which is a start point of the second tapered portion, is set in a position closer to the center of the roller in the axis than a first start point which is a start point of the first tapered portion.
A fixing apparatus that conveys and heats a recording material bearing a toner image at a nip portion, comprising:
- a heating rotating member;
- and
- a roller that contacts the heating rotating member and forms the nip portion, the roller including a core, a first elastic layer formed outside the care bar, and a second elastic layer formed outside the first elastic layer and having hardness that is higher than hardness of the first elastic layer, wherein
- a first tapered portion is formed on an edge of the first elastic layer in the axis direction of the roller, and a second tapered portion is formed on an edge of the second elastic layer in the axis direction, and wherein
- a first start point, which is a start point of the first tapered portion, is set in a position closer to the center of the roller than a second start point, which is a start point of the second tapered portion.
Dependencies are inferred from the claim text.