Patent ID: 11927900
Assignee: RICOH COMPANY, LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 2:
3. The fixing device according to claim 2,
wherein when the transmission transmits a displacement of the pressure plate pressing the pressure rotator with the maximum pressing force to the entrance guide and the exit guide, the transmission sets an entrance guide angle between a reference line connecting an entrance of the nip and an exit of the nip and a first straight line connecting a center of the nip and a tip of the entrance guide to be in a range from +15° to +25° and an exit guide angle between the reference line and a second straight line connecting the center of the nip and a tip of the exit guide to be in a range from +18° to +24°, and
wherein when the transmission transmits a displacement of the pressure plate pressing the pressure rotator with the pressing force to press the envelope to the entrance guide and the exit guide, the transmission sets the entrance guide angle between the reference line and the first straight line to be in a range from −20° to 0° and the exit guide angle between the reference line and the second straight line to be in a range from −10° to +5°,
where a positive angle of each of the entrance guide angle and the exit guide angle is formed by the reference line and one of the first straight line and the second straight line that are inclined toward one rotator of the fixing rotator and the pressure rotator, the one rotator having a convex shape in the nip, and a negative angle of each of the entrance guide angle and the exit guide angle is formed by the reference line and one of the first straight line and the second straight line that are inclined toward the other rotator of the fixing rotator and the pressure rotator, the other rotator having a concave shape in the nip.