US Patent No. 9,244,397

IMAGE HEATING APPARATUS HAVING FIXING MEMBER AND SUPPLYING COOLING AIR TO A NON-SHEET-PASSING AREA FOR COOLING THE FIXING MEMBER


Patent No. 9,244,397
Issue Date January 26, 2016 
Title Image Heating Apparatus Having Fixing Member And Supplying Cooling Air To A Non-sheet-passing Area For Cooling The Fixing Member
Inventorship Hiroshi Takami, Yokohama (JP)
Assignee Canon Kabushiki Kaisha, Tokyo (JP)

Claim of US Patent No. 9,244,397

1. An image heating apparatus for heating a toner image borne on a recording material while conveying the recording material
at a nip portion, the image heating apparatus comprising:
a heater;
a fixing member heated by the heater;
a pressure member configured to form the nip portion with the fixing member;
a first temperature detecting member configured to detect a sheet-passing area temperature of the fixing member or the heater;
a second temperature detecting member configured to detect a non-sheet-passing area temperature of the fixing member or the
heater;

a control device configured to control the heater power supplied to the heater for maintaining the temperature detected by
the first temperature detecting member at a target temperature; and

an air supplying member supplying cooling air to the non-sheet-passing area for cooling the fixing member, the air supplying
member being started to be driven when the temperature detected by the second temperature detecting member reaches a predetermined
temperature,

wherein while the recording material is being conveyed at the nip portion, the control device controls the cooling air quantity
of the air supplying member in response to an electric current flowing in the heater for adjusting the cooling level of the
air supplying member, a rate at which the temperature of the non-sheet-passing area detected by the second temperature detecting
member increases reflecting the electric current flowing in the heater.