Canon Kabushiki Kaisha

Takayuki Inoue

Noriaki Matsui

Kiyoharu Kakomura

Naoka Omura

Yuya Ohta

Junichiro Nakabayashi

Nozomi Kumakura

Takuya Hayakawa

Kunio Takane

An image forming apparatus is capable of easily performing jam processing. When an occurrence of a jam of a sheet which is conveyed on a conveying path is detected, the image forming apparatus displays a jam processing display screen which guides processing in accordance with a position where the jam has occurred. After the processing in accordance with the jam processing display screen is performed, if a state of the jam remains unchanged, the image forming apparatus performs forced feeding, which forcibly conveys the sheet to a predetermined position. The image forming apparatus displays the jam processing display screen urging to perform processing in accordance with the position of the sheet after the sheet is forcibly conveyed.

Image forming apparatus, jam processing method

An image forming apparatus () is capable of continuing, when detecting running out of sheet in a cassette () during image formation, the image formation by performing switching to another cassette (). When it is determined that sheets are run out based on a signal supplied from a sheet sensor () of a cassette being used after exposure is started based on image data of a certain page, cleaning is performed on a secondary transfer roller () and exposure is started based on the image data of a target page before the cleaning is terminated.

Image forming apparatuses employing an electrophotographic method

A controller of an image forming apparatus calculates a density difference between a measurement result of a toner image having the highest density formed on a photosensitive drum, which is obtained by an image density sensor, and the highest density of a density target. When the density difference falls within a predetermined range, the controller generates a tone correction table based on a density value of a first toner image formed with a plurality of densities including the highest density, and sets, based on the density difference, an exposure amount of laser light to be applied to the photosensitive drum by an exposure device. When the density difference falls out of the predetermined range, the controller generates the tone correction table based on a density value of a second toner image having a larger number of tone levels than that of the first toner image.

Image forming apparatus

An image forming apparatus includes a first image forming unit configured to form a first image in a chromatic color, a second image forming unit configured to form a second image in black, an intermediate transfer member, a sensor, a first adjustment unit configured to adjust the image forming position for the black based on an adjustment value, a second adjustment unit configured to adjust image forming position based on an adjustment condition, and a generation unit configured to generate the adjustment condition. The generation unit generates a first adjustment condition based on a user instruction relating to a first test image having chromatic color on a sheet input from the input unit. The generation unit generates a second adjustment condition based on the reading result of the second test image having black on a sheet from a reading device.

Growing community of inventors

Matsudo, Japan

Takayuki Inoue