Fixing apparatus with pressure state detection and control

Details Fixing apparatus with pressure state detection and control Fixing apparatus with pressure state detection and control

2009-05-22

2011-10-18

Beatty, Robert (Department: 2852)

Electrophotography

Diagnostics

Fixing

Reexamination Certificate

active

08041237

ABSTRACT:
In one embodiment, a fixing apparatus is configured of a pressing portion for causing the pressure roller to enter a pressure applied state by applying bias, a switching portion for causing the pressing portion in the pressure applied state to enter a pressure released state by causing a cam to rotate forward, a pressure state detection portion for detecting the pressure released state, and a control portion for, when shifting from the pressure applied state to the pressure released state, turning forward the cam of the switching portion in the pressure applied state and stopping the cam after the pressure state detection portion detects the pressure released state. If the cam is turned forward with respect to the switching portion for a certain time period, but the pressure state detection portion does not detect the pressure released state, the control portion performs forward rotational direction retry control.

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