US 9,811,038 B2
Image heating apparatus having a discriminating portion for discriminating whether an endless belt is broken
Tomoaki Tanto, Toride (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Dec. 7, 2015, as Appl. No. 14/960,682.
Claims priority of application No. 2014-248814 (JP), filed on Dec. 9, 2014; and application No. 2015-220240 (JP), filed on Nov. 10, 2015.
Prior Publication US 2016/0161891 A1, Jun. 9, 2016
Int. Cl. G03G 15/00 (2006.01); G03G 15/20 (2006.01)
CPC G03G 15/55 (2013.01) [G03G 15/2039 (2013.01); G03G 15/2053 (2013.01); G03G 15/2017 (2013.01); G03G 2215/0132 (2013.01); G03G 2215/2035 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An image heating apparatus comprising:
an endless belt configured to heat a toner image on a sheet;
a temperature raising portion configured to raise a temperature of said endless belt;
a first detector configured to detect the temperature of said endless belt at a widthwise central portion of said endless belt;
a controller configured to control energization to said temperature raising portion depending on an output of said first detector;
a second detector configured to detect the temperature of said endless belt at one widthwise end portion of said endless belt;
an air blower configured to blow air depending on an output of said second detector to cool the one widthwise end portion of said endless belt; and
a discriminating portion configured to discriminate whether or not said endless belt is broken on the basis of the output of said second detector when said air blower is operated while effecting the energization to said temperature raising portion,
wherein said discriminating portion determines that said endless belt is broken when a detected temperature of said second detector is less than a predetermined temperature.