Fixing device, image forming apparatus, and inspection method

Patent metadata

Field	Value
Publication number	US-12449758-B2
Application number	US-202418603262-A
Country	US
Kind code	B2
Filing date	Mar 13, 2024
Priority date	Mar 17, 2023
Publication date	Oct 21, 2025
Grant date	Oct 21, 2025

Abstract

A fixing device includes a fixing rotator to fix an unfixed image on a recording medium, a pressure member disposed opposite the fixing rotator to press an outer circumferential surface of the fixing rotator; a heating source disposed inside an inner circumferential surface of the fixing rotator to heat the fixing rotator, and a composite member disposed inside the inner circumferential surface. The composite member includes a first member, a second member attached to the first member, and an inspection region for measurement of glossiness. The first member and the second member have a difference in glossiness. The inspection region allows identification of which one of the first member and the second member is present on a surface of the inspection region based on the glossiness of the inspection region, and determination of that the fixing device has a desired fixing configuration based on a result of the identification.

First claim

The invention claimed is:

1. A fixing device comprising:
a fixing rotator to fix an unfixed image on a recording medium;
a pressure member disposed opposite the fixing rotator to press an outer circumferential surface of the fixing rotator;
a heating source disposed inside an inner circumferential surface of the fixing rotator to heat the fixing rotator; and
a composite member disposed inside the inner circumferential surface of the fixing rotator, the composite member including:
a first member;
a second member attached to the first member, the first member and the second member having a difference in glossiness;
circuitry configured to measure glossiness; and
an inspection region at which the glossiness is measured by the circuitry configured to measure glossiness, the inspection region allowing identification of which one of the first member and the second member is present on a surface of the inspection region based on the glossiness of the inspection region, and determination that the fixing device has a predetermined fixing configuration based on a result of the identification,
wherein:
the fixing device is for use in an image forming apparatus whose candidates include a first image forming apparatus and a second image forming apparatus,
the second image forming apparatus has a higher printing speed than the first image forming apparatus,
a difference in maximum printing speed between the first image forming apparatus and the second image forming apparatus is five sheets per minute or more, and
the inspection region allows identification of which one of the first member and the second member is present on the surface of the inspection region based on the glossiness of the inspection region, and determination of whether the fixing device is included in a desired image forming apparatus based on a result of the identification,
the second member has a first surface irradiated with radiant heat from the heating source and a second surface used for securing the second member to the first member,
the second surface has a securing member hole used for attaching the second member to the first member,
the inspection region is disposed on the second surface,
when the fixing device is included in the first image forming apparatus, the inspection region is not located in an opening coupled to the securing member hole in the second member, and
when the fixing device is included in the second image forming apparatus, the inspection region is located in the opening coupled to the securing member hole in the second member.

2. The fixing device according to claim 1 , further comprising a nip former that abuts on the pressure member via the fixing rotator to form a nip portion,
wherein the first member is a support supporting the nip former, and
the second member is a reflector disposed inside the inner circumferential surface of the fixing rotator to reflect radiant heat radiated from the heating source.

3. An image forming apparatus comprising the fixing device according to claim 1 .

4. A fixing device comprising:
a fixing rotator to fix an unfixed image on a recording medium;
a pressure member disposed opposite the fixing rotator to press an outer circumferential surface of the fixing rotator;
a heating source disposed inside an inner circumferential surface of the fixing rotator to heat the fixing rotator; and
a composite member disposed inside the inner circumferential surface of the fixing rotator, the composite member including:
a first member;
a second member attached to the first member, the first member and the second member having a difference in glossiness;
circuitry configured to measure glossiness; and
an inspection region at which the glossiness is measured by the circuitry configured to measure glossiness, the inspection region allowing identification of which one of the first member and the second member is present on a surface of the inspection region based on the glossiness of the inspection region, and determination that the fixing device has a predetermined fixing configuration based on a result of the identification,
wherein:
the fixing device is for use in an image forming apparatus whose candidates include a first image forming apparatus and a second image forming apparatus,
the second image forming apparatus has a higher printing speed than the first image forming apparatus,
a difference in maximum printing speed between the first image forming apparatus and the second image forming apparatus is five sheets per minute or more, and
the inspection region allows identification of which one of the first member and the second member is present on the surface of the inspection region based on the glossiness of the inspection region, and determination of whether the fixing device is included in a desired image forming apparatus based on a result of the identification,
the second member has a first surface irradiated with radiant heat from the heating source and a second surface used for securing the second member to the first member,
the second surface has a positioning hole used for attaching the second member to the first member,
the inspection region is disposed on the second surface,
when the fixing device is included in the first image forming apparatus, the inspection region is not located in an opening coupled to the positioning hole in the second member, and
when the fixing device is included in the second image forming apparatus, the inspection region is located in the opening coupled to the positioning hole in the second member.

5. The fixing device according to claim 4 , further comprising a nip former that abuts on the pressure member via the fixing rotator to form a nip portion,
wherein the first member is a support supporting the nip former, and
the second member is a reflector disposed inside the inner circumferential surface of the fixing rotator to reflect radiant heat radiated from the heating source.

6. An image forming apparatus comprising the fixing device according to claim 4 .

7. An inspection method for a fixing device including a fixing rotator to fix an unfixed image on a recording medium; and a composite member disposed inside an inner circumferential surface of the fixing rotator, the composite member including a first member and a second member attached to the first member, the first member and the second member having a difference in glossiness, the inspection method comprising:
identifying which one of the first member and the second member is present on a surface of an inspection region that is a region for measurement of glossiness in the composite member, based on the glossiness of the inspection region; determining that the fixing device has a desired fixing configuration based on an identification result;
measuring the glossiness of the inspection region with an inspection jig; and
determining the glossiness with the inspection jig based on a difference in intensity between light incident on the inspection region and reflected light from the inspection region.

Assignees

• Iwama Mototaka
• Yoshiura Arinobu
• Nakamoto Shogo
• Hase Takamasa
• Yamashita Kentaro
• Inoue Daisuke
• Ricoh Co Ltd

Inventors

• Iwama Mototaka
• Yoshiura Arinobu
• Nakamoto Shogo
• Hase Takamasa
• Yamashita Kentaro
• Inoue Daisuke

Classifications

• G03G15/55

  Self-diagnostics; Malfunction or lifetime display · CPC title

• G03G2215/2035

  the fixing nip having a stationary belt support member opposing a pressure member · CPC title

• G03G2221/1639

  for the fixing unit · CPC title

• G03G15/2053

  Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating · CPC title

• G03G15/2064

  combined with pressure · CPC title