# US 2020/0393784 A1 · Fixing device

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- Number: US 2020/0393784 A1
- Document ID: US20200393784A1
- Status: Published application
- Kind: A1
- Application number: 17/006,204
- Filed: 2020-08-28
- Published: 2020-12-17
- Earliest claimed: 2018-03-09
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: Takuma Tadomi
- Web page: https://patentgrep.com/patent/US20200393784A1

## CPC

- G03G 15/2025: {with special means for lubricating and/or cleaning the fixing unit, e.g. applying offset preventing fluid}
- G03G 15/2053: {Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating}
- G03G 15/20: for fixing, e.g. by using heat
- G03G 15/2064: {combined with pressure}
- G03G 2215/2032: the belt further entrained around additional rotating belt support members
- G03G 2215/2035: the fixing nip having a stationary belt support member opposing a pressure member
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

A fixing device includes an endless belt; a driving rotatable member cooperative with said endless belt to form a nip for fixing a toner image on a recording material and for driving said endless belt; an urging member provided inside said endless belt to urge said endless belt toward said driving rotatable member; and a rubbing rotatable member for rubbing an outer surface of said endless belt.

## Claims

### Claim 1

A fixing device comprising:
an endless belt;
a driving rotatable member cooperative with said endless belt to form a nip for fixing a toner image on a recording material and configured to drive said endless belt;
an urging member provided inside said endless belt and configured to urge said endless belt toward said driving rotatable member; and
a rubbing rotatable member configured to rub an outer surface of said endless belt.

### Claim 2 (depends on 1)

A device according to claim 1, further comprising a back-up member configured to back said rubbing rotatable member up by way of said endless belt when a rubbing treatment by said rubbing rotatable member is carried out.

### Claim 3 (depends on 2)

A device according to claim 2, further comprising a moving mechanism configured to move said rubbing rotatable member between a first position in which said rubbing rotatable member contacts said endless belt and a second position in which said rubbing rotatable member is separated from said endless belt, wherein when said the rubbing rotatable member is in the second position, said back-up member does not contact an inner surface of said endless belt.

### Claim 4 (depends on 3)

A device according to claim 3, wherein when said rubbing member is in the second position, said back-up member is separated from the inner surface of said endless belt by not less than 0.5 mm.

### Claim 5 (depends on 2)

A device according to claim 2, wherein in a longitudinal direction of said fixing device, a length of said rubbing rotatable member is not more than a length of an area in which said back-up member contacts said endless belt.

### Claim 6 (depends on 1)

A device according to claim 1, wherein a surface of said rubbing rotatable member is provided with #1000-#4000 grain.

### Claim 7 (depends on 1)

A device according to claim 1, wherein said rubbing rotatable member has a surface roughness Ra of not less than 2.0 μm and not more than 4.0 μm.