US 11,947,290 B2
Image forming apparatus that forms images on a recording material
Atsushi Nakamoto, Tokyo (JP); and Kazuhiro Doda, Kanagawa (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Aug. 5, 2022, as Appl. No. 17/882,455.
Claims priority of application No. 2021-139656 (JP), filed on Aug. 30, 2021.
Prior Publication US 2023/0064449 A1, Mar. 2, 2023
Int. Cl. G03G 15/20 (2006.01)
CPC G03G 15/2039 (2013.01) 13 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
an image forming unit configured to carry out an image formation on a recording material;
a first rotatable member;
a second rotatable member contacting an outer peripheral surface of the first rotatable member and configured to form a nip portion between itself and the first rotatable member;
a heater disposed in an inside space of the second rotatable member;
a first temperature detecting unit provided on the heater at a central position with respect to a longitudinal direction of the heater;
a second temperature detecting unit provided at a position closer to an end side of the heater than the first temperature detecting unit with respect to the longitudinal direction of the heater; and
a control unit configured to control a feeding interval in which a trailing edge of a preceding recording material passes through the nip portion until a leading edge of a subsequent recording material reaches the nip portion,
wherein the control unit controls the feeding interval to be a first interval so that a number of printable sheets per unit time becomes a first number in a case in which a feeding speed of a preceding recording material and a subsequent recording material is a first feeding speed and a temperature detected by the second temperature detecting unit is a first temperature,
wherein the control unit controls the feeding interval to be a second interval shorter than the first interval so that the number of printable sheets per unit time becomes a second number smaller than the first number in a case in which the feeding speed of a preceding recording material and a subsequent recording material is a second feeding speed lower than the first feeding speed and the temperature detected by the second temperature detecting unit is the first temperature, and
wherein the control unit controls the feeding interval to be a third interval longer than the first interval in a case in which the temperature detected by the second temperature detecting unit is equal to or higher a predetermined temperature higher than the first temperature.