Canon Kabushiki Kaisha

Kazuyoshi Chiku

Yasushi Murayama

Takashi Uchida

Kunihiko Matsuzawa

Tomohiro Aoki

Yoshihiko Hirose

Kazunori Kanekura

Osamu Hoshino

Yukio Sato

Hiroyuki Miyake

Ken Miyagi

Yoichi Kubota

Hideaki Mitsutake

Shigeyoshi Onoda

Yasutsugu Saijo

Norio Hashimoto

A sheet conveyor apparatus is provided with a first rotator for supplying the feeding force to a sheet in contact with the sheet, a second rotator for supplying the feeding force to the sheet in contact with the sheet and from the opposite side of the sheet, a drive rotator rotatable by the drive force from a drive source, and a drive transmission for transmitting the drive force of the drive rotator to the second rotator so as to rotate the second rotator at a peripheral velocity higher than that of the first rotator. While the sheet is being conveyed, the drive transmission allows a slip as it transmits the drive force so that the second rotator can rotate at a peripheral velocity in conformance with that of the sheet.

Sheet conveyor apparatus with slip transmission

An image forming apparatus for forming superimposed images has a plurality of image holders each respectively for holding an image, a plurality of image forming stations for forming an image on the holders, and an adjusting device for adjusting positions of images formed on image holders except for that image station which is designated to be a standard station for adjusting or which is not used of image formation.

Superposed image forming apparatus with plural and adjustable image

A transmissive original projecting apparatus has an illuminator for illuminating a transmissive original, a projector for directing light transmitted through the transmissive original to the original supportion portion of an original reading apparatus, and a connecting device for connecting the illuminating illuminator and the projector together.

Transmissive original projecting apparatus

An image forming apparatus has a plurality of image forming stations capable of forming different images which are to be correctly registered and superimposed. Elimination of possible image misregistration in each image station is executed on the basis of the result of detection of register marks which are formed by each image forming station. The correction is executed at a timing which is independent from image forming sequences performed by each imgae forming station in accordance with image signals, e.g., during warming-up of the apparatus after the initial application of the power immediately after the input of image forming operation start instruction through a start key, or after completion of production of a predetermined number of copies counted from the last misregistration correcting operation.

Image forming apparatus

An image forming apparatus for forming superimposed images includes a plurality of image forming devices each for forming a different image and a registration mark, corresponding to the position of the associated image, on an image transferring medium. The registration mark is formed on a transparent part of the medium and is illuminated from below. A detector above the medium detects the position of the shadow of the registration mark for each image and the result of detection is used to adjust the position of at least one image forming device to produce proper registration between the images formed by the respective image forming devices.

Apparatus for forming superimposed images

There is provided a multiimage forming apparatus for forming image data onto photo sensitive drums by an electrophotographic system. This apparatus comprises: an image forming circuit to form different images onto the photo sensitive drums; a transfer device to transfer the images on the drums onto the same transfer paper; a conveying belt to convey the transfer paper; a control circuit to control the image forming circuit so as to form registration marks to match the positions of the images onto the drums; CCD detectors to detect the recording positions of the marks; and a correcting circuit to correct at least two of the positional direction in the conveying direction of the belt, the positional deviation in the direction perpendicular to the belt conveying direction, the magnification of the image, and the inclination of the image on the basis of the detection outputs of the detectors. With this apparatus, the positional deviations of the images which occur during the image formation can be accurately corrected, so that the images can be accurately formed on the transfer paper by reading and matching the position matching registration marks.

Multiimage forming apparatus

The invention relates to an image forming apparatus comprising a belt-shaped member for feeding a sheet, at least one image forming means arranged in confronting relation to the belt-shaped member, a separation means for carrying out the separation between the belt-shaped member and the image forming means by shifting at least one of the belt-shaped member and image forming means, a drive means for driving the belt-shaped member, a cleaning means for cleaning the belt-shaped member, a signal generating means for emitting a signal, and a control means for separating the belt-shaped member from the image forming means by controlling the separation means and for then rotating the belt-shaped member at a predetermined speed during the image formation by controlling the drive means.

An image forming apparatus such as a laser beam printer has a plurality of movable image carrying members such as photosensitive drums, an image forming member such as a laser beam scanner capable of forming on the image carrying members images of different colors correspoding to image information, and transfer devices for sequentially transferring the image carried by the image carrying members to an image receiving member such that the image of different colors are superposed. The image receiving member may be copy paper or an overhead projector sheet, and is fed by a feeding device in the form of an endless belt. A lifting device is provided to move the feeding device from an operative position to at least one retracted position in response to detection of jamming or when an image receiving member having a large heat capacity is used.

An electrographic apparatus includes a plurality of photosensitive members, a plurality of laser projecting devices for projecting deflecting laser beams for scanning the photosensitive members, the laser projecting devices being provided for the respective photosensitive members, mirrors for receiving the laser beams projected from the laser projecting devices and reflecting them in a substantially reverse direction to scan the photosensitive members with the reversed laser beams, the mirrors being provided for the respective laser projecting devices. The apparatus may further includes adjusting devices, provided for the respective mirrors, for adjusting relative positions between the photosensitive members and associated ones of the mirrors.

Electrophotographic apparatus

A superimposed image forming apparatus, includes a plurality of electrophotographic photosensitive drums, toner image forming devices, provided for the respective photosensitive drums, for forming toner images on the respective photosensitive drums, image transfer devices, provided for the respective photosensitive drums, for transferring the toner images formed on the photosensitive drums onto a transfer material at respective image transfer stations, conveying devices for conveying the transfer material sequentially through the respective image transfer stations, and adjusting mechanisms for adjusting inclinations of rotational axes of the photosensitive drums. Thus, image inclination of a resultant image can be corrected by adjusting the inclination of the axis of the drum by an amount which is a half of the image inclination.

Superimposed image forming apparatus

An image forming apparatus includes a movable image bearing member; a driver for driving the image bearing member; elements for forming a latent image on the image bearing member; a developing device for developing the latent image formed on the image bearing member by the latent image forming elements; and a transferring device for transferring a developed image developed by the developing device onto an image receptor. The time interval required for the image bearing member to move from a latent image forming position, where the latent image forming elements form the latent image on the image bearing member, to a transfer position, where the transferring device transfers the developed image onto the image receptor, is an integer multiple of a period of the drive non-uniformity inherent in the driver.

An image display apparatus includes a first image carrier along with an apparatus for inputting an image signal. An erasable image is formed on the first image carrier in accordance with the image signal input from the image signal input apparatus. A display area displays the image formed on the first image carrier. A second image carrier, which is associated with the first image carrier, contains a visible image which is photoelectrically read and converted to an image signal. The visible image carried on the second image carrier is automatically erased after the visible image is converted to an image signal.

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Tokyo, Japan

Kazuyoshi Chiku