Ricoh Company, Ltd.

Ricoh Printing Systems, Ltd.

Hitachi Koki Co., Ltd.

Other

Hitachi, Ltd.

Akihiko Yamazaki

Isao Nakajima

Shuho Yokokawa

Akira Asaoka

Yukio Otome

Sho Sawahata

Souichi Nakazawa

Akitomo Kuwabara

Kunitomo Takahashi

Hidefumi Ohtsuka

Hiromitsu Fukuda

Hideharu Miki

Makoto Yagawara

Yoji Hirose

Hiroyuki Mabuchi

Masahiro Yagi

Chikara Hiraoka

Shinichi Akatsu

Kazutaka Sato

Tsukasa Onose

Kenji Asuwa

Youji Hirose

Hidenori Iwanaga

Youichi Takeuchi

Yukinori Sakuma

Takeshi Watanabe

Kazuhiro Shimojima

Tomomichi Kawashima

Shinya Yamazaki

An image forming apparatus has a photoconductive drum or belt supporting a toner image, a transfer member transferring the toner image onto a recording medium, a transportation device transporting the recording medium to between the photoconductor and the transfer member, a charger charging a surface of the transfer member to the anti-polarity of the electric charge of the toner image, a rotation drive unit rotating the transfer member to the same direction of the recording medium transportation, a contacting/removing unit that contacts the transfer member to the image supported member for printing and removes the transfer member from the image supported member when not printing, and a drive force transferring/blocking unit that transfers the drive force from the rotation drive unit to the transfer member before print starting-up and blocking the drive force during printing.

Image forming apparatus and tandem image forming apparatus

An image forming apparatus forms high precision full color image by correcting the adhesion quantity of an image visualizing agent and a position shift of a visible image while performing printing process. The image forming apparatus includes an intermediate transfer unit; plural photoconductors; plural charging units; plural exposure units; plural developing units; plural first transferring units; and plural second transferring units. The intermediate transfer unit has a correction pattern image formed in a region outside a predetermined maximum document region in a direction perpendicular to the moving direction. A detector in the intermediate transfer unit detects the correction pattern image. A correction controller performs correcting, based on detection results of the detector, setting values of one or more of the charging units, the exposure units, and the developing units when a region corresponding to an interval between the visible images passes a position beneath one of the units.

Image forming apparatus and image forming method

According to one embodiment, an image forming apparatus includes an image carrier, a image forming unit, a measurement unit and a controller. The image carrier includes a central region on which a target image as an object of an image forming is formed and a peripheral region placed outward of the central region. The image forming unit forms a reference image on the peripheral region and the central region, before the image forming is started. Also, the image forming unit forms the target image on the central region based on a preset condition and a third reference image on the peripheral region, during the image forming. The measurement unit measures a physical quantity for the reference images.

Image forming apparatus and toner adhesion amount correction method

A printing apparatus including a first component having a photosensitive member and a transcribing portion transcribing a toner image formed on the photosensitive member onto a web, and a second component having a web guide portion guiding the web transported to the transcribing portion and a fixing portion fixing the toner image transcribed onto the web, the first component and the second component being able to be connected/divided, the first component is provided with a transcribing portion base supporting the transcribing portion, the second component is provided with a web guide portion base arranged at a position opposed to the transcribing portion base supporting the web guide portion, and an adjusting member for restricting a position of the second component relative to the first component is provided between the transcribing portion base and the web guide portion base.

Printing apparatus

To provide a printer capable of minimizing the effect of a wrapping member, which is used for wrapping a recording form around a photoconductor, on image quality and realizing high image quality printing, a conveying roller, wrapping roller, and transfer unitsandare arranged so that a line La connecting a center Ca of a rollerand a transfer point Ta and a line Lb connecting a center Cb of a rollerand a transfer point Tb are inclined to a central line A-A and are almost symmetric to the central line A-A. When the wrapping width W of the form around belt photoconductorsandis specified to 5 mm&#x2266;W&#x2266;25 mm, even when a wrapping roller is not arranged between printing unitsand, a fixed wrapping width of the form S around the belt photoconductorsandis reserved.

Printer capable of reserving sheet wrapping width

A film loading method of an image forming apparatus, includes: loading an endless film which was stored in a container box, using at least two support members, to a film frame of the image forming apparatus, wherein the film is supported by the support members in a different form with respect to a condition of the film when loaded and fitted to the film frame. The support members are initially stored in the container box and serve as a packaging member for use in transporting and storing the film. The support members are attached to respective portions of the film frame and guide the film to be loaded and fitted onto the film frame. The film frame includes holding rollers, and the support members are attached to the respective portions of the film frame, coaxially with the holding rollers.

Film loader for an image forming apparatus

The invention provides a film driving apparatus in which no adverse effect is caused by a change in the circumferential length of a film even if there arises the change in circumferential length of the film due to environmental fluctuation. In the film driving apparatus, an endless filmsupported by a driving roller, a film support rollerand a skew correction rolleris rotated in a predetermined direction by the rotation of a driving roller. The skew correction rollerhas a structure in which one end thereof is movable with the other end as a fulcrum. The movement trajectory of the movable end portion of the skew correction rolleris an elliptic trajectory not causing any change in the circumferential length of the film

Film driving apparatus and image forming apparatus using the same

A film loader for the image forming apparatus has a film formed endlessly and a film frame for holding the film, wherein a guide member for attaching or detaching the film with respect to the film loading portion of the film frame is formed by a packaging member for use in transporting and storing the film.

A belt unit of an electrophotographic printing apparatus, includes: two rollers for supporting a belt so as to be substantially in parallel with each other; two frames for supporting the rollers and attached to opposite ends of one of the rollers respectively so as to be perpendicular to the rollers; two support members attached to opposite ends of the other roller so as to be perpendicular to the rollers; two elastic members interposed between the two support members and the two frames respectively; and a belt mounting guide provided between the two frames. The belt mounting guide includes a rotating shaft disposed in parallel with the rollers, and an edge portion inclined relative to an axial direction of the rotating shaft.

Belt unit of electrophotographic printing apparatus

An image forming apparatus has an endless belt which serves as an image carrier is characterized by reduced image misregistration and reduced machining cost. When the endless belt feed path is divided into a path from a drive roller to a tension roller, and a path from the tension roller to the drive roller, the eccentricity of an idle roller located on the path on the side including a latent image forming point is set to a value smaller than that of an idle roller located on the path not including the image forming point.

Image forming apparatus having belt-shaped carrier

A heating belt is laid along a conveying path for a recording medium moved after development, a halogen lamp is incorporated in a belt drive roller for driving the heating belt so as to heat the heating belt by heat generated by the halogen lamp, and accordingly, the heating belt whose temperature is controlled at a predetermined temperature heats the recording sheet. With this arrangement, the conveying speed of the recording sheet and the moving speed of the heating belt are set to be equal to each other. Alternatively, the heating belt may itself generate heat.

Recording apparatus with conveyed recording sheet heated by movable

A toner image heating device for heating a recording material holding a toner image includes: a first heating roller having a plurality of heaters which are different in heat generating region from one another; and a second heating roller having a plurality of heaters which are different in heat generating region from one another. A heat generating region dividing position between said heaters adjacent to each other in said second heating roller is shifted from a heat generating region dividing position between said heaters adjacent to each other in said first heating roller.

Toner image heating device

An electrophotographic apparatus is provided in which toner stick hardly occurs by improving the cooling effect on the strip of paper sheets after they are heat-fixed. This electrophotographic apparatus includes a fixing unit for heating toner transferred on a continuous strip of paper sheets and fixing the toner, and a folding unit for supplying a folding force to the continuous strip of paper sheets. A conveyer unit is arranged in the back stage of the electrophotographic apparatus for transferring the continuous strip of paper sheets, received from folding unit, in the horizontal direction.

Electrophotographic apparatus for a continuous strip of paper sheets

An electrophotographic apparatus for transferring a toner image formed on a photosensitive drum onto a sheet of paper and melt-fixing the toner image on the sheet of paper, having a paper detector at a predetermined position in a transporting path of the sheet of paper, the paper detector being composed of a light projector, a reflecting member for reflecting a primary light beam emitted from the light projector and a light receiver for sensing a secondary light beam reflected by the reflecting member, to prevent erroneous detections the light receiver is placed at a position relatively displaced with respect to a position where the light projector is located so that the primary light beam and the secondary light beam have tilting components to both a plane parallel to a transporting plane of the sheet of paper and a plane vertical to the transporting plane.

Growing community of inventors

Ibaraki, Japan

Akihiko Yamazaki