Fusing device having a pressure member, pushing member fusing belt and roller
View Patent ↗To prevent a defective fusing from occurring, a fusing member has a roller; a fusing belt heated and rendered to drive along a circumference of the roller; a pressure member disposed outside the fusing belt and rendered in pressurized contact with the roller through the fusing belt; and a pushing member disposed inside the fusing belt, as arranged together with and at an upstream side from the roller in a driving direction of the fusing belt, and rendered in pressurized contact with the pressure member through the fusing belt. The fusing belt and the pressure member compose a contact area for allowing a recording medium to pass through. The pushing member is disposed inside the fusing belt as arranged together with and on an upstream side with respect to the roller in a driving direction of the fusing belt, so that the contact becomes wider.
1. A fusing device, comprising:
a roller;
a fusing belt that is heated and driven along a circumference of said roller;
a pressure member disposed outside said fusing belt and arranged in pressurized contact with said roller through said fusing belt; and
a pushing member disposed inside said fusing belt and arranged on an upstream side of said roller relative to a driving direction of said fusing belt, and being in pressurized contact with said pressure member via said fusing belt;
wherein said fusing belt and said pressure member form a contact area through which a recording medium passes;
wherein a pushing force for causing said pushing member to be in pressurized contact with said pressure member is set less than a pushing force for causing said pressure member to be in pressurized contact with said roller; and
wherein said pushing member has a pressurized contact portion disposed in front of an area at which said pressure member is in pressurized contact with said roller.
2. The fusing device according to claim 1 , wherein said pushing member has a sliding surface in contact with said roller.
3. The fusing device according to claim 2 , wherein said sliding surface includes a fluoric resin.
4. The fusing device according to claim 1 , wherein said pushing member is composed of a plate shaped member having an elasticity.
5. The fusing device according to claim 1 , wherein said pushing member has a projecting portion that projects toward said pressure member.
6. The fusing device according to claim 1 , wherein said pushing member includes a resin member in contact with said fusing belt.
7. The fusing device according to claim 6 , wherein said resin member has an elasticity.
8. The fusing device according to claim 7 , wherein said resin member is composed of a material made of a silicone resin.
9. The fusing device according to claim 6 , wherein a surface of said resin member is provided with a fluoric resin.
10. The fusing device according to claim 1 , wherein a contact area between said roller and said pressure member is greater than a contact area between said pressure member and said pushing member.
11. A fusing device, comprising:
a roller
a fusing belt that is heated and driven along a circumference of said roller;
a pressure member disposed outside said fusing belt and arranged in pressurized contact with said roller through said fusing belt; and
a pushing member disposed inside said fusing belt and arranged on an upstream side of said roller relative to a driving direction of said fusing belt, and being in pressurized contact with said pressure member via said fusing belt;
wherein said fusing belt and said pressure member form a contact area through which a recording medium passes;
wherein a pushing force for causing said pushing member to be in pressurized contact with said pressure member is set less than a pushing force for causing said pressure member to be in pressurized contact with said roller; and
wherein said pushing member is composed of a plate shaped member having an elasticity.
12. The fusing device according to claim 11 , wherein said pushing member has a pressurized contact portion disposed in front of an area at which said pressure member is in pressurized contact with said roller.
13. The fusing device according to claim 11 , wherein a contact area between said roller and said pressure member is greater than a contact area between said pressure member and said pushing member.