# US 2017/0255145 A1 · Fixing device and image forming apparatus

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2017/0255145 A1
- Document ID: US20170255145A1
- Status: Published application
- Kind: A1
- Application number: 15/244,079
- Filed: 2016-08-23
- Published: 2017-09-07
- Earliest claimed: 2016-03-04
- Assignees: Fuji Xerox Co., Ltd.
- Applicants: Fuji Xerox Co., Ltd.
- Inventors: Kyogo SOSHI; Kiyoshi IWAI; Yasutaka GOTOH; Sou MORIZAKI; Jouta KOBAYASHI; Hiroko FURUKATA
- Web page: https://patentgrep.com/patent/US20170255145A1

## CPC

- G03G 15/2053: {Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating}
- G03G 15/206: {Structural details or chemical composition of the pressure elements and layers thereof}
- G03G 2215/2025: the fixing nip having a rotating belt support member opposing a pressure member
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

A fixing device includes a first belt that heats a developer image on a recording medium; a support member that is arranged inside the first belt and supports the first belt; a second belt that sandwiches the recording medium with the first belt; a pressing roller that is provided with the second belt having an inner peripheral surface wound thereon, is provided rotatably in a direction orthogonal to a recording-medium transport direction as an axial direction, presses the second and first belts toward the support member, and forms a first press region; and a forming member that is provided inside the second belt, at an upstream side in the transport direction with respect to the pressing roller, presses the second and first belts toward the support member, and forms a second press region having a larger width than that of the first press region in the transport direction.

## Claims

### Claim 1

A fixing device comprising:
a first belt that heats a developer image on a recording medium;
a support member that is arranged inside the first belt and supports the first belt;
a second belt that sandwiches the recording medium with the first belt;
a pressing roller that is provided with the second belt having an inner peripheral surface wound around the pressing roller, is provided rotatably in a direction orthogonal to a transport direction of the recording medium as an axial direction, presses the second belt and the first belt toward the support member, and hence forms a first press region; and
a forming member that is provided inside the second belt, at an upstream side in the transport direction with respect to the pressing roller, presses the second belt and the first belt toward the support member, and hence forms a second press region having a larger width than a width of the first press region in the transport direction.

### Claim 2 (depends on 1)

The fixing device according to claim 1, further comprising:
a driving source that rotates the pressing roller,
wherein a length by which the second belt is wound around the pressing roller in a circumferential direction of the pressing roller is at least about ½ of a peripheral length of the pressing roller.

### Claim 3 (depends on 1)

The fixing device according to claim 1, wherein the pressing roller includes a hollow shaft portion.

### Claim 4 (depends on 2)

The fixing device according to claim 2, wherein the pressing roller includes a hollow shaft portion.

### Claim 5 (depends on 1)

An image forming apparatus comprising:
a developer image forming unit that forms a developer image on a recording medium; and
the fixing device according to claim 1 that fixes the developer image formed on the recording medium by the developer image forming unit, to the recording medium.