Canon Kabushiki Kaisha

Yoshikuni Tohyama

Koichi Miyamoto

Tadayuki Kitajima

Yoshio Ito

Hiroo Kobayashi

Masato Ishida

Yoshimasa Kimura

Katuhiko Yamada

Hiroshi Ogawa

Seiji Sagara

Hidetoshi Tanaka

Tadashi Suzuki

Toshio Honma

Shinji Kanemitsu

Hideki Adachi

Tomohiro Aoki

Masahiro Tomosada

Naoyuki Ohki

Toshirou Kasamura

Katsushi Furuichi

Kazuo Kawakubo

Tateki Nagaoka

Kiyokazu Namekata

Yasuhito Kan

Akihiko Katsura

An image forming apparatus including at least first and second developing devices for developing latent images formed on an image bearing member. The first and second developing devices contain developers of different colors, respectively. The second developing device contains a developer of a predetermined color and is fixedly mounted in the image forming apparatus. The first developing device contains a developer of a color other than the predetermined color and is detachably mountable in the image forming apparatus. Only the first developing device is exchangeable.

Image forming apparatus comprising a plurality of developing devices

A double-sided image forming apparatus having first and second input devices respectively for entering function data for desired image formation functions and for entering the number of copies to be formed. A memory is provided to store the function data, and a storage compartment is provided to store sheets during duplex copying. An image forming device is arranged to operate in two procedures: a first procedure in which image formation is effected on the sheet's first side in accordance with first function data, and a second procedure in which image formation is effected on the other side in accordance with a second, different, function data. A controller controls the image forming device so that entry of number data and function data is permitted before the first procedure begins, but so that entry of only function data and not number data is permitted after completion of the first procedure. A detecting device is provided to detect the presence of sheets in the storage compartment, and the controller operates until sheets are no longer detected.

Double-side image forming apparatus

An electrophotographic apparatus capable of synthesizing two images with a cleaner boundary. Two images are synthesized by forming two images in respectively designated areas, and cleaner boundary is obtained by erasing any image in the boundary zone of these two images.

Electrophotographic apparatus for making superposed images

A transfer type image formation apparatus is of such a type that a transfer material is placed in close contact with an image bearing member in an image transfer station, and then separated from the image bearing member by separating means after the image on the image bearing member has been transferred onto the transfer material by transferring means, wherein a rotary member is located upstream of the separating means in the direction of movement of the transfer material, the rotary member being adapted to make a rolling contact with the image bearing member such that the image can stably be transferred onto the transfer material.

Transfer station alignment device

A scanning type image formation apparatus capable of selectively changing image magnifications is provided with a mirror for scanning an original, movable support means for supporting the mirror, a moving member to which a drive force transmitting member is connected and which is caused to move along a predetermined path for scanning of the original by the drive force transmitted by the drive force transmitting member, connecting means for connecting to the moving member the movable support means supporting the mirror, and means for changing the connected position of the movable support means to the moving member to change the length of the light path correspondingly to a selected magnification.

Scanning type image formation apparatus

In a slit exposure scanning type copying machine or the like, a thin white member is fixedly disposed in the image forming main optical path from the vicinity of the end of an original stopping reference member or the vicinity of the end of an original carriage keep member, whereby the image forming main light beam from said vicinity of the end is not effectively transmitted to an image plane but instead, part of an illuminating light beam for illuminating an original from the opposite sides thereof is reflected by the white member, thereby forming predetermined blank spaces at the end portions of copy paper corresponding to the scanning starting end and the scanning terminating end. The white member is disposed at a predetermined angle with respect to the original by taking the scanning direction into account so that the shadow thereof imparted to the slit exposure area on the original surface does not greatly decrease the quantity of light of the illuminating light beam which contributes to image formation.

Slit exposure device with white reflecting member

A copy magnification modifying apparatus for changing the copy magnification by displacing optical members involved in the image formation to and maintaining the same at a position capable of forming an image of a selected magnification of an original onto a photosensitive member, including a rotary drive source, an optical member displacing mechanism for transmitting the drive force of the rotary drive source through one-directional rotary clutch and resilient member to said optical members thereby guiding the same along a determined path, an optical member stopper for stopping said optical members at a position corresponding to the selected image magnification, and a drive source control system adapted for continuing the function of the rotary drive source after the stopping of the optical members to cause a deformation in a resilient member thereby generating a resilient force biasing the one-directional rotary clutch in a direction opposite to the rotating direction thereof.

Copy magnification modifying apparatus

Apparatus for printing reproduction copies of an original image or recording such original image on an image recording member, is provided with a device for determining whether the image to be recorded conforms in size to the image recording member. The apparatus provides an indication to the operator of the apparatus when non-conformance is detected.

Printing apparatus

A scanning apparatus includes a scanner, a driver for reciprocating the scanner, and a control mechanism which controls the drive force of said driver so as to drive the scanner with a low acceleration at the initial stage of drive of the scanner.

Image forming apparatus

A cleaning device for removing developer remaining on the surface of an image-bearing member comprises wiper means having a resilient blade member adapted to bear against the surface of the image-bearing member, guide means having a guide member defining, with the resilient blade member, a slit-like opening through which the removed substance from the image-bearing surface is introduced, conveyor means for conveying the collected substance along a conveyance path substantially parallel to the slit-like opening and axially of the image-bearing member, and seal means for sealing the space between the slit-like opening and the conveyance path.

Cleaning device

This specification discloses a developer treating device for preventing scattering or similar phenomenon of developer in an electrophotographic copying machine. The device is applicable to a developing device, a cleaning device or the like disposed in opposed relationship with the surface of a photosensitive medium to be developed or to be cleaned. In order that the flow of developer may be positively utilized to prevent the same from flowing out of the developing device or the cleaning device, the device has a developer scatter preventing member such as stay or the like which forms a multistage slit between itself and the surface of the photosensitive medium.

Developer housing sealing device for electrophotography

This specification discloses improvements in a separating belt disposed between an image-bearing member such as a photosensitive medium or the like and a transfer medium to which the image on the image-bearing member is to be transferred. In the device of the prior art, the separating belt has been fatigued by being subjected to localized friction with respect to the image-bearing member and/or a rotating member for effecting the separation. In the present invention, the separating belt is gradually moved in accordance with the operation of the device incorporating the separating belt therein, whereby the separating belt may be prevented from localized friction and need not be replaced by another belt for a long time.

Separator device for transfer medium

A variable magnification copying apparatus includes optical scanning means for scanning an image original at a variable velocity in accordance with a copying magnification desired, a photosensitive drum movable at a predetermined velocity from an exposure station to an image transfer station, conveyor means for conveying copy medium to the image transfer station, detector means for generating a signal when the scanning means has scanned an edge of the image original or a portion thereof near the edge, and control means coupled to the detector means for controlling the conveyor means by the signal so as to ensure the image of the original to be copied with the leading edge thereof registered to the leading edge of the copy medium with respect to the direction of conveyance, irrespective of changes in magnification.

Variable magnification copying apparatus

A driving device for a moving body comprises a drive shaft normally rotated in one direction by a drive source, a follower shaft in engagement with the drive shaft to transmit the drive to the moving body, one-way connecting means loosely mounted on the drive shaft to connect and disconnect the drive of the drive shaft to the follower shaft, and accumulator means for accumulating the returning force of the moving body by utilizing the movement of the moving body resulting from the normal rotation of the follower shaft. The follower shaft may be reversed in rotation by the accumulator means upon disconnection of the one-way connecting means and the speed of the reverse rotation of the follower shaft is controlled by operation of the one-way connecting means so as not to exceed the driving speed of the drive shaft.

Driving device for a moving body

In an electrophotographic copying apparatus of the type in which a toner image is transferred from the surface of a photosensitive medium to a transfer medium, a transfer medium separating device comprises a rotatable separating roller disposed downstream of an image transfer station where a toner image is transferred from the surface of the photosensitive medium to the transfer medium, a transfer medium end guide belt disposed in contact with the peripheral surface of the rotatable separating roller for separating one end of the transfer medium from the surface of the photosensitive medium at the image transfer station and for guiding the transfer medium away from the photosensitive medium after the image transfer, and a rotatable pressure roller disposed in pressure contact with the rotatable separating roller for transporting the transfer medium while urging the same against the rotatable separating roller and for separating the transfer medium from the surface of the photosensitive medium.

Growing community of inventors

Yokohama, Japan

Yoshikuni Tohyama