# US 5,708,947 A · Toner image fixing device

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

- Number: US 5,708,947 A
- Document ID: US5708947A
- Status: Granted
- Kind: A
- Application number: 08/781,179
- Filed: 1996-12-20
- Granted: 1998-01-13
- Earliest claimed: 1995-12-26
- Assignees: Sharp Kabushiki Kaisha
- Inventors: Toshiaki Kagawa; Toshihiro Tamura; Shogo Yokota
- Web page: https://patentgrep.com/patent/US5708947A

## CPC

- G03G 15/206: {Structural details or chemical composition of the pressure elements and layers thereof}
- G03G 15/2028: {with means for handling the copy material in the fixing nip, e.g. introduction guides, stripping means}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

A toner image fixing device has a heat-resistant sheet that possesses excellent durability, fixing ability, transporting ability and working reliability. In a toner image fixing device that has a fixing roller, a pressure member disposed as pressed against the fixing roller, and a heat-resistant sheet secured between the fixing roller and the pressure member and fixes a toner image on a recording medium by heat while the latter passing through nip portion formed between the fixing roller and the heat-resistant sheet. The heat-resistant sheet is a sheet made of synthetic resin PTFE containing polyimide.

## Claims

### Claim 1

A toner image fixing device for fixing by heat a toner image formed on a recording medium, which is provided with a fixing roller, a pressure member disposed as pressed against the fixing roller, and a heat-resistant sheet secured between the fixing roller and the pressure member for guiding the recording medium carrying an unfixed toner image thereon and which is wherein the heat-resistant sheet is made of synthetic resin which base is PTFE (Polytetrafluoroethylene) containing polyimide.

### Claim 2 (depends on 1)

A toner image fixing device as defined in claim 1, wherein a polyimide content of the heat-resistant sheet is in a range of 3 to 7 percent.

### Claim 3 (depends on 2)

A toner image fixing device as defined in claim 2, wherein the heat-resistant sheet has a thickness of 200 to 400 microns.