US 5,436,431 AGranted

Toner image fixing device having improved lamp heater

AssigneeSharp Kabushiki Kaisha

InventorsMasaru Tsuji, Hiroshige Araki, Hideki Gotoh, Yoshikazu Kondoh, Atsuyuki Kato, Yoshinobu Tateishi, Yuhi Akagawa, Mitsuyoshi Terada, Takashi Sugito, Toshihide Ohgoshi, Naoyuki Yamane

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Abstract

A toner image fixing device comprises a heat roller and a lamp heater. The lamp heater is formed from a nicrome wire stretched between clamp terminals, a silica tube and ceramic holders closely fitted to respective ends of the silica tube and which have an external diameter which is substantially the same as the diameter of the heating roller. The lamp heater is secured by a lamp holder and frame to the shaft of the heat roller. The heat roller is rotatably supported by a bearing and is driven by a driving gear.

Claims4

Dependent claims

A toner image fixing device, comprising

a cylindrical heating roller having an opening at both ends and being rotatably supported,
a lamp portion for heating the heating roller and a lamp holder for supporting the lamp inside the heating roller,
said lamp portion including a cylindrical silica tube with an opening at both ends,
a nichrome wire stretched inside the silica tube,
clamp terminals holding the respective ends of the nichrome wire, and
respective holders, each having a peripheral flange with an external diameter which is substantially the same as the diameter of the heating roller, and each fitted onto a respective end opening of the silica tube, to hold the respective clamp terminals of the nichrome wire.

3 more elements

Dependencies are inferred from the claim text.