IMAGE FORMING APPARATUS

• US 20190079436A1
• Filed: 09/07/2018
• Published: 03/14/2019
• Est. Priority Date: 09/08/2017
• Status: Active Grant

• Current Assignee: Canon Finetech Nisca Incorporated (Canon Inc.)
• Original Assignee: Canon Finetech Nisca Incorporated (Canon Inc.)
• Inventors: Ohnishi, Takahiro
• Granted Patent: US 10,642,201 B2
• Time in Patent Office: Days
• CPC Class Codes: G03G 15/2017 Structural details of the fixing unit in general, e.g. cooling means, heat shielding means G03G15/2053 takes precedence
• CPC Class Codes: G03G 15/2021 Plurality of separate fixing and/or cooling areas or units, two step fixing
• CPC Class Codes: G03G 15/2028 with means for handling the copy material in the fixing nip, e.g. introduction guides, stripping means
• CPC Class Codes: G03G 15/2046 specially for the influence of heat loss, e.g. due to the contact with the copy material or other roller
• CPC Class Codes: G03G 15/2064 combined with pressure
• CPC Class Codes: G03G 15/50 Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control sequencing control G03G21/14
• CPC Class Codes: G03G 2221/1657 transmitting mechanical drive power

Abstract

An image forming apparatus includes: a fixing portion which heats and fixes an unfixed image borne by a recording medium while nipping and conveying the recording medium by a rotation of a rotating member; and a controller which, in a following order, performs a non-heating rotation of rotating the rotating member without heating the rotating member at the fixing portion after the fixing, performs a heating rotation of heating the rotating member while rotating the rotating member, and performs a stop state heating of heating the rotating member in a stop state.

Claims

1. An image forming apparatus comprising:

a fixing portion which heats and fixes an unfixed image borne by a recording medium while nipping and conveying the recording medium by a rotation of a rotating member; and

a controller which, in a following order, performs a non-heating rotation of rotating the rotating member without heating the rotating member at the fixing portion after the fixing, performs a heating rotation of heating the rotating member while rotating the rotating member, and performs a stop state heating of heating the rotating member in a stop state.

2. The image forming apparatus according to claim 1,

wherein the controller is configured to select a first mode in which the non-heating rotation is performed after the fixing and then the stop state heating is performed after the heating rotation, and

a second mode in which the non-heating rotation is performed after the fixing and then the stop state heating is performed without performing the heating rotation.

3. The image forming apparatus according to claim 1,

wherein the controller performs control such that the rotation of the rotating member starts ahead of the heating of the rotating member at a time of performing the heating rotation.

4. The image forming apparatus according to claim 1, further comprising:

a detection portion which detects a temperature of the rotating member,

wherein the controller performs the stop state heating after performing the heating rotation when the temperature of the rotating member is lower than a predetermined temperature.

5. The image forming apparatus according to claim 1, further comprising:

an end portion temperature detection portion which detects a temperature of an end portion of the rotating member in a rotation axis direction,

wherein the controller continues the non-heating rotation until the end portion temperature detection portion detects a predetermined temperature or lower.

6. The image forming apparatus according to claim 1, further comprising:

a detection portion which detects a temperature of the rotating member,

wherein the controller changes a rotation time and a heating temperature of the rotating member in response to a temperature of the rotating member at a time when the heating rotation starts.

7. The image forming apparatus according to claim 6,

wherein the controller extends a time in which the rotating member is heated in a rotation sate as the temperature of the rotating member decreases at a time when the heating rotation starts.

8. The image forming apparatus according to claim 6,

wherein the controller increases a rotating member heating temperature as the temperature of the rotating member decreases at a time when the heating rotation starts.

9. The image forming apparatus according to claim 1,

wherein a rotation time of the rotating member during the heating rotation is a time in which the rotating member rotates once or more.

10. The image forming apparatus according to claim 1, further comprising:

a storage portion which stores history information of an image forming operation,

wherein the controller changes a rotation time and a heating temperature of the rotating member during the heating rotation based on the history information.

11. The image forming apparatus according to claim 1, further comprising:

an environment detection portion which detects a temperature in a periphery of the apparatus,

wherein the controller changes a rotation time and a heating temperature of the rotating member during the heating rotation based on a detection result of the environment detection portion during the heating rotation.

12. The image forming apparatus according to claim 1,

wherein the rotating member has a film-shaped structure and a base film thickness of the film-shaped structure is 100 μ

m or less.

13. The image forming apparatus according to claim 12,

wherein a base material of the film-shaped structure is metal.

14. An image forming apparatus comprising:

a fixing portion which heats and fixes an unfixed image borne by a recording medium while nipping and conveying the recording medium by a rotation of a rotating member; and

a controller configured to set a first mode in which a rotation heating of heating the rotating member in a rotation state is performed after the fixing and then a stop state heating of heating the rotating member in a stop state is performed and a second mode in which the stop state heating is performed without performing the heating rotation after a non-heating rotation of rotating the rotating member without heating the rotating member.