Fixing unit

Patent metadata

Field	Value
Publication number	US-11714368-B2
Application number	US-202217706448-A
Country	US
Kind code	B2
Filing date	Mar 28, 2022
Priority date	Mar 29, 2021
Publication date	Aug 1, 2023
Grant date	Aug 1, 2023

Abstract

An image forming apparatus includes a heating rotary member, a pressure rotary member, a nip portion formed by the rotary members, a temperature adjustment control section controlling a temperature of the heating rotary member to a target temperature, a cleaning web removing toner adhering to the heating rotary member, and a controller selectively executing one of a cleaning mode and a non-cleaning mode. A first basis weight and a second basis weight greater than the first predetermined basis weight are set, in a job that mixedly uses recording media with the first and second basis weights. When the controller executes the non-cleaning mode, the temperature adjustment control section sets a target temperature of a recording medium with a basis weight less than or equal to the first basis weight to a temperature lower than a target temperature of the recording medium in the cleaning mode.

First claim

What is claimed is:

1. An image forming apparatus comprising:
a heating rotary member arranged to heat an unfixed toner image born on a recording medium;
a pressure rotary member arranged to pressurize the heating rotary member;
a nip portion formed by the pressure rotary member and the heating rotary member and arranged to, when a recording medium bearing a toner image is conveyed to the nip portion, fix the toner image on the recording medium;
a temperature adjustment control section configured to control a temperature of the heating rotary member such that the temperature of the heating rotary member becomes a target temperature;
a cleaning web arranged to remove toner adhering to the heating rotary member; and
a controller configured to execute one mode from among a plurality of modes including a cleaning mode in which the cleaning web cleans toner during image formation and a non-cleaning mode in which the cleaning web does not clean toner during image formation,
wherein a first predetermined basis weight and a second predetermined basis weight greater than the first predetermined basis weight are set, and
wherein a target temperature of a recording medium with the first predetermined basis weight in a case where the non-cleaning mode is executed is lower than a target temperature of the recording medium with the first predetermined basis weight in a case where the cleaning mode is executed.

2. The image forming apparatus according to claim 1 , wherein
a target temperature of a recording medium with the second predetermined basis weight in a case where the non-cleaning mode is executed is higher than a target temperature of the recording medium with the second predetermined basis weight in a case where the cleaning mode is executed.

3. The image forming apparatus according to claim 1 , further comprising:
a collector roller arranged to be brought into contact with the heating rotary member and collect toner adhering to the heating rotary member; and
a contact and separation unit arranged to bring the cleaning web into contact with and separate from the collector roller, wherein
when the controller executes the non-cleaning mode, the contact and separation unit is arranged to separate the cleaning web from the collector roller.

4. The image forming apparatus according to claim 1 , further comprising
a control section configured to, when image formation is not able to be performed due to the cleaning mode, display a prompt to replace the cleaning web.

Assignees

• Canon Kk

Inventors

• Hasegawa Mitsuru
• Kawai Hiroki
• Ogata Ayano
• Toratani Yasuharu
• Takeuchi Suguru
• Chikugo Youichi
• Tatezawa Hidekazu
• Tsuno Yutaro
• Tanaka Kenichi
• Takemasa Rikiya

Classifications

• G03G15/2025 Primary

  with special means for lubricating and/or cleaning the fixing unit, e.g. applying offset preventing fluid · CPC title

• G03G15/2046

  specially for the influence of heat loss, e.g. due to the contact with the copy material or other roller · CPC title

• G03G15/5029

  by measuring the copy material characteristics, e.g. weight, thickness · CPC title

• G03G2215/00742

  of sheet weight · CPC title

• G03G2215/2038

  the belt further entrained around one or more rotating belt support members · CPC title