Thermal fixing device with heat roller capable of heating a nip

Details Thermal fixing device with heat roller capable of heating a nip Thermal fixing device with heat roller capable of heating a nip

1994-10-28

1997-03-18

Brase, Sandra L.

Electrophotography

Image formation

Fixing

G03G 1520

Patent

active

056127740

ABSTRACT:
In a thermal fixing device, a heat roller includes: a cylindrical electrode layer having a plurality of electrode portions formed to and protruded from an outer peripheral surface thereof; a cylindrical resistor layer, with its inner peripheral surface being in confrontation with the outer peripheral surface of the electrode layer; and a cylindrical and resilient insulation layer provided interposed between the electrode layer and the resistor layer, the insulation layer having a plurality of through holes formed therethrough, each through hole being formed for receiving an electrode portion inserted therein. A power source supplies an electric power between the electrode layer and the resistor layer. The pressure roller is pressed toward the heat roller so as to form a nip portion between the pressure roller and the heat roller where the pressure roller abuts the heat roller. The insulation layer of the heat roller is resiliently compressed at the nip portion so that the electrode portions at the nip portion are brought into electrical connection with the resistor layer, to thereby cause electric current to flow in the resistor layer at the nip portion and generate heat therein for thermally fixing operation.

REFERENCES:
patent: 4471210 (1984-09-01), van den Eijnden
patent: 5138379 (1992-08-01), Kanazashi
patent: 5283621 (1994-02-01), Hashizume
patent: 5402211 (1995-03-01), Yoshikawa
patent: 5402220 (1995-03-01), Tanaka et al.
patent: 5506667 (1996-04-01), Kinoshita

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