Canon Kabushiki Kaisha

Yuya Kojima

Hiroyuki Munetsugu

Tsuguhiro Yoshida

Akihiko Uchiyama

Toshihiko Takayama

Takaaki Akamatsu

Hiroki Hashii

An image forming apparatus includes a main body of an apparatus, a door, an image forming unit, a sensor that outputs a predetermined signal when the door is opened, and a control unit that determines that the door is open if the predetermined signal is output from the sensor for a threshold time. When the door is opened, the image forming unit changes to a state where image formation is not executable. The control unit sets a first time as the threshold time, in a period in which the image forming unit contributes to image formation on a recording material. The control unit sets a second time longer than the first time as the threshold time, in a period in which the image forming unit does not contribute to image formation on a recording material or a period in which no image is formed on a recording material.

Image forming apparatus that determines opening of door

The apparatus includes a CPU which executes, based on a detection result of a BD sensor, start-up control for controlling driving of a scanner motor, so that a rotation number of the scanner motor reaches a predetermined rotation number, and executes determination control for determining a voltage to be applied to a primary transfer unit based on a detection result of a transfer current detection circuit by a transfer voltage output circuit upon execution of image formation, and when an image forming station K which executes image formation is different from an image forming station Y including the BD sensor, the CPU parallelly executes the start-up control and determination control.

Multi-station image forming apparatus with start-up control

An image forming apparatus has an intermediate transfer member onto which an image is transferred, a transfer part transferring the image formed on the intermediate transfer member onto a transfer, a detection part detecting a transfer which is conveyed, a both-surface conveying part reversing the transfer with an image being formed on a first surface, and conveying the transfer to the transfer part again, and a control wherein a timing when forming an image on a second surface of the transfer by the image forming part is set based on a time necessary to reverse the transfer material and a size in a conveying direction of a transfer material.

Image forming apparatus and double-sided image forming apparatus

An image forming apparatus, which is configured to form an image on a sheet, includes an image forming unit configured to form an unfixed toner image on the sheet, and a fixing unit configured to fix the unfixed toner image to the sheet by heating the sheet bearing the unfixed toner image while conveying the sheet by a fixing nip portion. The image forming apparatus can perform a cleaning mode for cleaning the fixing unit by conveying a sheet with an unfixed toner image for cleaning formed thereon by the fixing nip portion. At a time of the cleaning mode, the image forming unit forms the unfixed toner image for cleaning on a sheet surface opposite from a sheet surface where the unfixed toner image is formed at a time of image formation.

Growing community of inventors

Kamakura, Japan

Yuya Kojima