Canon Kabushiki Kaisha

Akira Hamano

Koichi Taniguchi

Rin Ishikawa

Tadashi Iwakawa

Daisuke Aruga

Yuichiro Imai

Saimon Gokyu

Takashi Tsujimura

An image forming apparatus includes an image forming portion, a rotatable endless belt, a plurality of stretching rollers including an inner roller and an upstream roller; an outer member, a pressing member, a moving mechanism; and a control portion. The moving mechanism is capable of changing a pressing amount of the pressing member to the belt or a contacting and separating state of the pressing member to the belt by changing a position of the pressing member. The control portion controls magnification of a toner image, to be formed on the belt by the image forming portion, with respect to a conveyance direction of the belt based on a position of the pressing member by the moving mechanism while the toner image is transferred to the recording material from the belt.

Image forming apparatus having controller to control movement of pressing member for pressing the inner surface of transfer belt

An image forming apparatus forms a plurality of images of different colors on an intermediate transfer belt by a plurality of image forming portions. The image forming apparatus detects a color misregistration amount of the image formed on the intermediate transfer belt and performs image formation using a correction value based on the color misregistration amount. If an elapsed time from previous image formation is less than a predetermined time, the image forming apparatus predicts the correction value using the previous correction value and the temperature at that time and performs color misregistration correction. If the elapsed time from the previous image formation is a predetermined time or longer, the image forming apparatus predicts the correction value using the correction value and the temperature at the time when the elapsed time becomes a predetermined time or longer and performs the color misregistration correction.

Image forming apparatus

When a mechanism enters a first state, an intermediate transfer member separates from a second photosensitive member. When the mechanism enters a second state, the intermediate transfer member contacts the second photosensitive member. When a first monochrome image is formed on a sheet of a first type by using toner of a first color, the mechanism enters the first state. When a second monochrome image is formed on a sheet of a second type by using toner of the first color, the mechanism enters the second state. A rotation speed of the second photosensitive member for forming the second monochrome image on the sheet of the second type is controlled to a predetermined rotation speed. The predetermined rotation speed is slower than a rotation speed of the second photosensitive member for forming the second image.

Method of controlling target speed of rotating member used in image forming apparatus

Prediction accuracy of a color misregistration amount in an image formation executed in an image forming apparatus is improved. The image forming apparatus comprises an optical box storing an optical system for irradiating a laser beam from a laser source to a photosensitive drum, a scanner temperature sensor provided near the optical box, and an environmental temperature sensor for detecting a surrounding temperature of the image forming apparatus, and a control section. When image formation is executed, the control section obtains a temperature Tscn detected by the scanner temperature sensor and a temperature Tenv detected by the environmental temperature sensor and calculates a prediction value of a position misregistration amount to the photoreceptor of the laser beam using the difference between Tscn and Tenv.

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Kashiwa, Japan

Akira Hamano