Fixing device and image forming apparatus

摘要

A fixing device capable of shifting to a sleep state includes a heat source; a rotatable fixing member that is partly heated by the heat source to heat an unfixed image carrying surface of a recording medium; a rotatable pressing member that is in pressure contact with the fixing member to form a nip portion between the pressing member and the fixing member; a rotation drive unit that directly or indirectly rotates the fixing member; a temperature detecting unit that detects a temperature of the fixing member; and a controller configured to prohibit the fixing device from shifting to the sleep state when the temperature of the fixing member in a region facing the heat source is equal to or more than a predetermined temperature T1 at a point when a predetermined time period t1 has elapsed from the stop of rotation drive of the rotation drive unit.

主权项

1. A fixing device capable of shifting to a sleep state, the fixing device comprising:
a heat source; a rotatable fixing member that is heated by the heat source to heat an unfixed image carrying surface of a recording medium; a rotatable pressing member that is in pressure contact with the fixing member to form a nip portion between the pressing member and the fixing member; a rotation drive unit that directly or indirectly rotates the fixing member or the pressing member; a temperature detecting unit that detects a temperature of the fixing member; and a controller configured to:
prohibit the fixing device from shifting to the sleep state when the temperature of the fixing member is equal to or more than a predetermined temperature T1 at a point after a stop of rotation drive of the rotation drive unit, andallow the fixing device to shift to the sleep state in a predetermined sheet feed condition that is employed before the stop of rotation drive of the rotation drive unit, without determining whether to prohibit the fixing device from shifting to the sleep state.