# US 5,708,951 A · Toner image fixing device

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- Number: US 5,708,951 A
- Document ID: US5708951A
- Status: Granted
- Kind: A
- Application number: 08/732,878
- Filed: 1996-10-16
- Granted: 1998-01-13
- Earliest claimed: 1995-10-18
- Assignees: Fuji Xerox Co., Ltd.
- Inventors: Hideo Saito; Kazumi Inaba; Hideaki Sekiguchi; Keitaro Sonoguchi
- Web page: https://patentgrep.com/patent/US5708951A

## 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: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

A toner image fixing device which has a satisfactory self-stripping ability to suppress the formation of creases of an envelope, and to prevent the abrasion of the elastic layers of a pair of toner image fixing rollers. In the fixing device, surface strain .di-elect cons.h in the circumferential direction of the first elastic layer of a first toner image fixing roller which comes in contact with a non-fixed toner image on a recording medium, and surface strain .di-elect cons.p in the circumferential direction of the second elastic layer of a second toner image fixing roller are defined by: .di-elect cons.h.gtoreq.0.0583 (.DELTA..di-elect cons.).sup.4 -0.6 (.DELTA..di-elect cons.).sup.3 +2.1917(.DELTA..di-elect cons.).sup.2 -3.65(.DELTA..di-elect cons.)+6 where .di-elect cons.h<6%, .DELTA..di-elect cons..ltoreq.3% and .DELTA..di-elect cons.=.di-elect cons.h-.di-elect cons.p.

## Claims

### Claim 1

A toner image fixing device comprising first and second toner image fixing rollers rotatable to each other in a state that said rollers are pressed each other; and a heating source contained in one of said fixing rollers; the surfaces of said first and second fixing rollers being covered with elastic layers, respectively, and a recording medium bearing a non-fixed toner image being passed through a nip between said first and second rollers to thereby fix the non-fixed toner image on said recording medium, wherein surface strain .di-elect cons.h in the circumferential direction of the elastic layer of said first roller which comes in contact with the non-fixed toner image on said recording medium, and surface strain .di-elect cons.p in the circumferential direction of the elastic layer of said second fixing roller are defined by:
.di-elect cons.h.gtoreq.0.0583 (.DELTA..di-elect cons.).sup.4 -0.6 (.DELTA..di-elect cons.).sup.3 +2.1917(.DELTA..di-elect cons.).sup.2 -3.65(.DELTA..di-elect cons.)+6
where .di-elect cons.h<6%, .DELTA..di-elect cons..ltoreq.3% and .DELTA..di-elect cons.=.di-elect cons.h-.di-elect cons.p.