Canon Kabushiki Kaisha

Yasuharu Hirado

Yusaku Iwasawa

Tomoaki Nakai

Taisuke Minagawa

Bunro Noguchi

Ken Yokoyama

Masaki Shimomura

Yoshiteru Kaida

An apparatus calculates a difference between a first vector extracted by a first unit and a second vector extracted by a second unit with a smaller amount of calculation than the first unit, generates a changed difference by changing a value of an element in the difference, and updates a parameter of the second unit based on the changed difference. An amount of change from a value of an element of the difference corresponding to a first element exceeding a threshold value in the first vector to a value of an element of the changed difference corresponding to the first element is larger than an amount of change from a value of an element of the difference corresponding to a second element not exceeding the threshold value in the first vector to a value of an element of the changed difference corresponding to the second element.

Information processing apparatus, information processing method, and non-transitory computer-readable storage medium

A controller controls a secondary transfer power source such that a current having a first value flows in a secondary transfer portion in a case where a transfer material with an image formed on a first surface thereof has been conveyed for less than a predetermined amount of time in a second conveyance path. Moreover, the controller controls the secondary transfer power source such that a current having a second value larger in absolute value than the first value flows in the secondary transfer portion in a case where the transfer material with an image formed on the first surface thereof is conveyed to the secondary transfer portion after waiting for the predetermined amount of time or more in the second conveyance path.

Image forming apparatus

The image forming apparatus includes a control unit that executes a supply operation to supply a toner charged with a regular charge polarity, to at least one abutting portion of a plurality of abutting portions, at the time of image non-formation, the plurality of abutting portions being formed by a plurality of cleaning members and a plurality of image bearing members, the control unit determining an image bearing member to which the most amount of the toner charged with the regular charge polarity is supplied, based on image formation information, the image formation information being information about an image formation executed before the supply operation is executed.

An image-forming apparatus includes a charging unit that charges toner with polarity opposite to a normal charging polarity of the toner and a control unit that performs collection operation for the toner charged with the opposite polarity by the charging unit. The control unit causes a first power supply to apply a first voltage having the opposite polarity to a first transfer member while first and second image bearing members are in contact with an intermediate transfer member. The control unit causes the first power supply to apply a second voltage having the opposite polarity and higher in absolute value than the first voltage to the first transfer member while the first image bearing member is in contact with the intermediate transfer member and the second image bearing member is separated from the intermediate transfer member.

Image-forming apparatus

The image forming apparatus includes a control unit configured to selectively execute an operation for applying a voltage with a polarity opposite to an original charging polarity of a toner to a first charging member and a second charging member and an operation for applying a voltage with the polarity opposite to the original charging polarity of the toner to one of the first charging member and the second charging member and a voltage with the same polarity as the original charging polarity of the toner to another of the first charging member and the second charging member as a cleaning operation for charging a secondary transfer residual toner to the polarity opposite to the original charging polarity of the toner by using the first charging member and the second charging member to transfer the secondary transfer residual toner onto an image bearing member.

Image forming apparatus with selective control of charges applied to residual toner

The fixing apparatus includes a first rotary member that comes into contact with the unfixed toner image, a second rotary member that is heated by the first rotary member and forms the nip portion together with the first rotary member, and an air supply unit that supplies air to the second rotary member. The fixing apparatus is configured to execute a first mode of warming the first rotary member and the second rotary member as a warm-up while rotating the first rotary member and the second rotary member before the fixing process and supplying air with the air supply unit in the fixing process, and a second mode of performing the warm-up for a longer period than in the first mode and supplying air with the air supply unit in the fixing process.

Fixing apparatus

An image forming apparatus includes an image forming station for forming an unfixed image on a recording material; a fixing portion for heating and fixing an unfixed image formed on the recording material, the fixing portion including a fixing rotatable member, and a pressing roller cooperative with the fixing rotatable member to form a nip for nipping and feeding the recording material; an ambient condition sensor for detecting an ambient temperature and an ambient humidity; and a controller for controlling the fixing portion; wherein the controller sets such a warming-up time for warming up the fixing portion that a temperature of the pressing roller at the time when the recording material enters the nip is a temperature calculated on the basis of the ambient temperature and the ambient humidity.

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Mishima, Japan

Yasuharu Hirado