Electrophotography – Image formation – Fixing
Patent
1997-11-12
1999-04-20
Smith, Matthew S.
Electrophotography
Image formation
Fixing
399329, 219216, G03G 1520
Patent
active
058951520
ABSTRACT:
Since the paper entry guide is disposed below and in close proximity to a fixing belt, the leading edge of recording paper can become wavy or curled when operated in a high temperature, high humidity environment or when printing on the reverse side of the paper in double-sided print mode, and this has lead to the problem that the leading edge of the recording paper after transfer is not properly inserted in the narrow spacing between the paper entry guide and the fixing belt, resulting in a recording paper jam. A fixing device comprises a fixing belt stretched around a heating roller with a heat source contained therein and a fixing roller, a pressing roller for pressing the fixing roller from below via the fixing belt, and a paper entry guide disposed below and in close proximity to the fixing belt and upstream of a nipping portion composed of the fixing belt and the pressing roller. The paper entry guide is pivotably supported on a fulcrum. A solenoid is provided at the upstream side of the paper entry guide, and a return spring is disposed above the paper entry guide. The solenoid, when in the ON state, pulls a plunger to its lowermost position against the spring force of the return spring, and thereby rotates the paper entry guide in the clockwise direction about the fulcrum to maintain spacing with respect to the fixing belt.
REFERENCES:
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patent: 5666623 (1997-09-01), Yamada et al.
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patent: 5771434 (1998-06-01), Hokari
Ide Atsushi
Irie Kazumi
Matsuda Hideo
Tsubaki Yoritaka
Yamamoto Masao
Conlin David G.
Sharp Kabushiki Kaisha
Smith Matthew S.
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