Canon Kabushiki Kaisha

Hiroshi Takazawa

Takashi Nakahara

Takashi Soya

Yuichi Seki

Hidenobu Suzuki

Atsushi Wada

Yasumasa Nashida

Koichi Otaka

Tomoko Nanbu

An image forming apparatus has an image forming unit and a film-heat-type fuser over which a sheet with an unfixed toner image passes and on which are positioned a first temperature-measuring device centered on the fuser so that a sheet always passes over that device and a second temperature measuring device disposed away from the center so that large sheets will pass over the second temperature measuring device and small sheets will not pass over the device when being conveyed correctly. The device also has a temperature control mechanism, a sheet size detector and throughput control, so that the throughput control changes throughput when the sheet size detector determines that a small sheet is being conveyed and the difference between the temperatures of the first and second temperature measuring devices is less than a predetermined value as the sheet passes over the fuser.

Imaging apparatus with image fixing throughput control based on sheet size and method of operation thereof

A heat fixing apparatus includes a heater; a temperature sensor for sensing a temperature of the heater; a bias wave number determining limit for determining the number of bias waves corresponding to a predetermined image fixing temperature in accordance with utility voltage source voltage; a bias wave number changing unit for changing a bias wave number in accordance with temperature changing rate of the heater; and a supply wave number control unit for controlling the number of waves supplied to the heater in accordance with an output of the temperature sensor and bias wave number. The unit includes a PID controller.

Heat fixing apparatus with temperature control based on AC power waves

Growing community of inventors

Chiba, Japan

Hiroshi Takazawa