Canon Kabushiki Kaisha

Kenji Takeda

Yusaku Takada

Akio Ohno

Kenji Yoshinaga

Kiyoharu Tanaka

Shinichi Oguri

Masahiro Goto

Kimio Nakahata

Kazuo Isaka

Tsuyoshi Watanabe

Norio Matsui

Takahiro Inoue

Fumitaka Kan

Masaaki Sakurai

Takao Aoki

Naruto Sugimoto

The present invention relates to an image forming apparatus which forms the multiple image by transferring the color toner images onto the transfer material sequentially. In such apparatus the drive source is provided for each image bearing member to rotate it. The ultrasonic motor is suitably used as the drive source and is attached to the rotary shaft thereof to detect rotating condition of the motor.

Image forming apparatus comprising ultrasonic motors

An image forming apparatus has an image bearing member, a first developing device containing a first color toner, a second developing device containing second color toner, wherein the first and second developing device are selectively switched, a transfer material carrying member capable of carrying a plurality of transfer materials each capable of receiving first and second color toner images and provided therebetween a first interval and a second interval which is larger than the first interval, such a region of the image bearing member as is passed through the developing position upon switching operation between the first developing device and the second developing device when the plurality of the transfer materials are carried on the transfer material carrying member, meets such a region of the transfer material carrying member as has the second interval, at the transfer position.

Imaging forming apparatus having transfer material carrying member for

A two-side image forming method apparatus and related method, the method including steps of: forming a multi-color image on one side of a recording material; heating the recording material, bearing the multi-color image on a side thereof, with a first amount of heat; forming a multi-color image on the other side of the recording material heated with the first amount of heat; and heating said recording material, bearing the multi-color images on both sides thereof with a second amount of heat larger than the first amount of heat.

Full-color image forming apparatus with two side capability and two-side

A transfer device for transferring a toner image onto a transfer material includes transfer material supporting device having a sheet-like material for supporting the transfer material and a supporting member for supporting the sheet-like material for movement along an endless path, gripper, mounted in an opening in the supporting member for releasably gripping an end of the transfer material, a sheet member mounted on the gripper to cover at least a portion of the gripper. A transfer device for transferring a toner image onto a transfer material includes a transfer drum including a transfer material supporting drum including a cut-away portion and a longitudinal strip, the cut-away portion being covered with a sheet-like member for supporting the transfer material, and wherein an end portion of the sheet-like material is bent toward inside of the transfer material supporting drum, and further including a releasable gripper disposed in the supporting drum for releasably gripping an end of the transfer material; and a cleaner contactable to the transfer drum to clean the same.

Anti-fouling device for sheet gripper

A copying machine, or a similar image recording apparatus, does not terminate the image forming process, even when an abnormality in sheet transportation is detected, until the process is completed, and a sheet bearing the image prepared in this image forming process is transported after jammed sheets are removed, so that unnecessary waste of imaging sheets can be avoided.

Transport control device for an image recording apparatus

A color image forming apparatus including an image bearing member movable along an endless path, on which color toner images are formed, a transfer material supporting member movable along an endless path for supporting a transfer material and conveying it to an image transfer position where the color toner images are superimposed and transferred sequentially to the transfer material. Also provided are a first driving motor for driving the image bearing member, and a second driving motor, separately provided from the first motor, for driving the transfer material supporting member. In addition, the apparatus includes a detector for detecting the speed of the surface of the transfer material, a discriminator for determining whether the speed variations detected by the detector are within a tolerable range, and a control, responsive to the discriminator, for stopping the operation of a subsequent image transfer step when the detected speed variation is beyond the tolerable range, and for repeating latent image forming, developing, and transfer steps.

Color image forming apparatus comprising separate motors for driving the

A plurality of developing devices or units are supported on a supporting member or turret which is rotatable to revolve the developing devices to move a desired developing device to a developing station where the developing operation is effected with the desired one of the developing devices. The developing devices are each provided with detecting elements for detecting the remaining amount of the developer or the concentration of the developer. The detecting elements are located at such a position that during the rotation of the supporting member the developer particles move with the rotation of the supporting member so that the detecting element is constantly cleaned by the moving developer.

Developing apparatus

A color image forming apparatus wherein a plurality of developing devices or units are supported on a supporting member or turret which is rotatable to revolve the developing devices to move a desired one of the developing devices to a developing station where the developing operation is effected with the desired one of the developing devices so that a color image is formed. The presence, absence or the amount of the developer within the developing devices are detected. When the detection indicates that the toner is to be supplied into a developing device, the developing device is moved to a predetermined developer supplying position, and then is stopped so that the developing device is supplied with the developer at the developer supplying position.

Color image forming apparatus

The present invention provides an apparatus wherein image fixing means is controlled for different fixing conditions under which a toner image is fixed on a recording material to adapt it to a synthetic resin sheet as the recording material or to a color image to be fixed, including at least one of fixing temperature, fixing speed and actuation of cleaning means. The present invention is particularly effective in use for a recording system in which the fixing temperature and speed are decreased and the cleaning means is actuated when a color image is to be formed on a transparent or resin sheet. The present invention is most useful for a color image recording system.

Recording apparatus

An electrophotographic method and apparatus is disclosed which is able to faithfully reproduce the half-tone portion of an original image on a photosensitive medium having an electroconductive layer, a photoconductive layer and an insulating surface layer. The present invention is directed particularly to improvements in the secondary charging step in the above method. According to the invention, the process of secondary charge includes the steps of subjecting the photosensitive medium to the action of corona discharge having the component of opposite polarity to that of the primary charge with simultaneous light image exposure, exposing the photosensitive medium surface to a light image while reducing or stopping the action of corona discharge and exposing the photosensitive medium surface to a light image while controlling the amount of corona discharge.

Electrophotographic method and apparatus for providing accurate

A development apparatus has a developer supporting member having a magnet therein and a thickness controlling member for the developer, the developer being a magnetic one-component developer which is applied to the surface of the developer supporting member by means of the thickness controlling member, the applied surface of the developer supporting member being brought into a position opposed to a latent-image carrying member to develop the latent image thereon, the surface of the developer supporting member being roughened by sand blast treatment with irregularly shaped and/or sized particles.

Growing community of inventors

Yokohama, Japan

Kenji Takeda