Fixing device
AssigneeBrother Kogyo Kabushiki Kaisha
InventorsTakehiro Masuda, Yoshiya Tomatsu
Life of this patent
Estimating the term…
Abstract
A thermistor is disposed confronting a surface of a heat roller on a downstream side in a rotational direction of a heat roller from a contact position between the heat roller and a pressure roller. Side guide members are provided on both sides of the thermistor and spaced away from the thermistor in the axial direction of the heat roller, and a regulating guide member is disposed connecting the side guide members on the downstream side in the rotational direction of the heat roller. In addition, a separation plate for separating a sheet of paper is provided at a predetermined space from the surface of the heat roller between the contact position and the thermistor in the rotational direction.
Claims35
A fixing device for fixing a developer image onto a fixing medium, the device comprising:
- a heating member extending in its axial direction and having a heating surface, the heating surface having a temperature;
- a pressure member in pressure contact with the heating member;
- a temperature detecting portion disposed confronting the heating surface for detecting the temperature of the heating surface;
- and
- at least one guide member disposed adjacent to the heating surface with a predetermined space therebetween and spaced away from the temperature detecting portion in the axial direction, thereby guiding, along the heating surface, the fixing medium that has not been separated from the heating surface and has been conveyed into the vicinity of the temperature detecting portion, wherein:
- the heating member and the pressure member confront each other at a nip portion;
- the fixing medium enters the nip portion at a first position and comes out of the nip portion at a second position;
- and
- the temperature detecting portion is located closer to the second position than to the first position.
A fixing device for fixing a developer image onto a fixing medium, the device comprising:
- a heating member extending in its axial direction and having a heating surface, the heating surface having a temperature;
- a pressure member in pressure contact with the heating member at a contact position;
- a temperature detecting portion disposed confronting the heating surface for detecting the temperature of the heating surface;
- a support member rotatably supporting the heating member;
- and
- a separating member disposed downstream from the contact position in the rotating direction of the heating member and upstream from the temperature detecting portion, the separating member including:
- a separating portion confronting the heating surface for separating the fixing medium from the heating surface after the developer image has been fixed onto the fixing medium;
- and
- a positioning portion directly contacting with the support member, thereby maintaining a distance between the separating portion and the heating surface at a predetermined separation distance L.
A fixing device for fixing a developer image onto a fixing medium, the device comprising:
- a heating member extending in its axial direction and having a heating surface, the heating surface having a temperature;
- a pressure member in pressure contact with the heating member;
- a temperature detecting portion disposed confronting the heating surface for detecting the temperature of the heating surface;
- a cover member covering the heating member;
- and
- at least one guide member disposed at the cover member and adjacent to the heating surface with a predetermined space therebetween, thereby guiding, along the heating surface, the fixing medium that has not been separated from the heating surface and has been conveyed into the vicinity of the temperature detecting portion, wherein:
- the heating member and the pressure member confront each other at a nip portion;
- the fixing medium enters the nip portion at a first position and comes out of the nip portion at a second position;
- and
- the at least one guide member is located closer to the second position than to the first position.
An image forming device comprising:
- an image bearing member bearing a developer image formed by developing an electrostatic latent image;
- a transfer unit transferring the developer image borne on the image bearing member to a fixing medium;
- and
- a fixing device including:
- a heating member extending in its axial direction and having a heating surface, the heating surface having a temperature;
- a pressure member in pressure contact with the heating member;
- a temperature detecting portion disposed confronting the heating surface for detecting the temperature of the heating surface;
- and
- at least one guide member disposed adjacent to the heating surface with a predetermined space therebetween and spaced away from the temperature detecting portion in the axial direction, thereby guiding, along the heating surface, the fixing medium that has not been separated from the heating surface and has been conveyed into the vicinity of the temperature detecting portion, wherein:
- the heating member and the pressure member confront each other at a nip portion;
- the fixing medium enters the nip portion at a first position and comes out of the nip portion at a second position;
- and
- the temperature detecting portion is located closer to the second position than to the first position.
Dependencies are inferred from the claim text.