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US 7,398,045 B2Granted
Fixing unit and image forming apparatus
AssigneeFuji Xerox Co., Ltd.
InventorsYasuhiro Uehara, Yasushi Kawahata, Daisuke Yoshino, Chikara Ando, Motofumi Baba, Yuka Nakayama, Toshiyuki Miyata
Life of this patent
Estimating the term…
Abstract
A fixing unit for fixing a toner image on a recording material includes: a rotatable fixing roll; a fixing belt stretched on the fixing roll; at least one tension roll stretching the fixing belt with the fixing roll; a pressurization member disposed to give a pressure to the fixing roll; and a stripping member disposed to press the outer surface of the fixing belt onto the pressurization member in a vicinity of a downstream side of a first contact portion between the fixing roll and the pressurization member.
Claims48
A fixing unit for fixing a toner image on a recording material, the fixing unit comprising:
- a rotatable fixing roll;
- a fixing belt stretched on the fixing roll;
- at least one tension roll for stretching the fixing belt together with the fixing roll;
- a pressurization member disposed to give a pressure to the fixing roll;
- and
- a stripping member disposed to press an outer surface of the fixing belt onto the pressurization member in a vicinity of a downstream side of a contact portion between the fixing roll and the pressurization member,
- wherein the pressurization member has a larger recess amount in the first contact portion than a recess amount of the fixing roll in the first contact portion.
4 more elements
A fixing unit comprising:
- a rotatable fixing roll;
- a belt member which is wound around the fixing roll and which rotates with the rotation of the fixing roll;
- a pressurization member disposed to give a pressure to the fixing roll through the belt member and to form a first nip portion;
- a pressing member disposed between the fixing roll and the belt member in a vicinity of a downstream side in a traveling direction of the belt member from the first nip portion to press the pressurization member through the belt member and to form a second nip portion,
- wherein the belt member and the pressurization member come in contact with each other at the first nip portion and the second nip portion, and
- wherein the pressurization member has a larger recess amount in the first contact portion than a recess amount of the fixing roll in the first contact portion.
3 more elements
An image forming apparatus comprising:
- a toner image forming unit forming a toner image;
- a transfer unit transferring the toner image formed by the toner image forming unit onto a recording material;
- and
- a fixing unit fixing the toner image transferred onto the recording material to the recording material, the fixing unit comprising:
- a fixing belt module comprising a rotatable fixing roll and a fixing belt stretched on the fixing roll and a tension roll;
- a pressurization member disposed to give a pressure to the fixing roll;
- and
- a stripping member disposed to press an outer surface of the fixing belt onto the pressurization member in a vicinity of a downstream side of a contact portion between the fixing roll and the pressurization member, and
- wherein the fixing belt module and the pressurization member come in contact with each other at a first nip portion and a second nip portion,
- wherein the first nip portion is formed by the fixing roll and the pressurization member with the fixing belt therebetween,
- wherein the second nip portion is formed by the pressurization member and the stripping member with the fixing belt therebetween, and
- wherein the pressurization member has a larger recess amount in the first contact portion than a recess amount of the fixing roll in the first contact portion.
9 more elements
A fixing unit for fixing a toner image supported on a recording material, comprising:
- a rotatable fixing roll;
- a belt member stretched on the fixing roll;
- a tension roll for stretching the belt member;
- a pressurization member disposed to give a pressure to the fixing roll;
- and
- a stripping member disposed to press an outer surface of the belt member onto the pressurization member in a vicinity of a downstream side of a contact portion between the fixing roll and the pressurization member,
- wherein a nip pressure Pn in an intermediate region between a first contact portion between the fixing roll and the pressurization member and a second contact portion between the pressurization member and the stripping member is set greater than or equal to a predetermined pressure value.
4 more elements
An image forming apparatus comprising:
- a toner image forming unit forming a toner image;
- a transfer unit transferring the toner image formed by the toner image forming unit onto a recording material;
- and
- a fixing unit fixing the toner image transferred onto the recording material to the recording material, the fixing unit comprising;
- a rotatable fixing roll;
- a belt member stretched on the fixing roll;
- a tension roll stretching the belt member;
- a pressurization member disposed to give a pressure to the fixing roll;
- a stripping member disposed to press an outer surface of the belt member onto the pressurization member in a vicinity of a downstream side from a contact portion between the fixing roll and the pressurization member;
- and
- a contact member disposed to bring an outer surface of the belt member into close contact with the pressurization member in an intermediate region between a first contact portion between the fixing roll and the pressurization member and a second contact portion between the pressurization member and the stripping member, and
- wherein a nip pressure Pn in the intermediate region is set greater than or equal to a predetermined pressure value.
9 more elements
Dependencies are inferred from the claim text.