Ricoh Company, Ltd.

Other

Kiyoshi Ohshima

Takashi Fujita

Hisashi Kikuchi

Hideki Kosugi

Toshihiko Baba

Atsushi Nakafuji

Shigeo Kurotaka

Jun Yura

Hirokazu Ikenoue

Kenichi Shimizu

Kazuaki Iizuka

Shigeru Suzuki

Yoshiyumi Tamiya

Tadahiro Suzuki

Katsuhiro Echigo

Seiichi Miyakawa

Echigo Katsuhiro

Minoru Suzuki

Yasushi Nakazato

Tadashi Shinohara

Manabu Mochizuki

Katsuo Sakai

Masao Hosaka

Takahiko Tokumasu

Yoichi Kubota

Takeshi Saito

Osamu Endo

Mitsugu Sugiyama

Harumitsu Mashiko

Kazuyuki Kato

Shin-ichi Kamiyama

Per Klockar

Kiyotaka Ota

Yoshiumi Tamiya

Eisyu Ohdake

A fixing apparatus includes a fixing member to be heated and a pressure-contacting member for pressure contacting the fixing member. The fixing apparatus directs and conveys a recording member through a nip formed between the fixing member and pressure applying member in such a manner that a toner image carried on a recording member contacts the fixing member in order to be fixed thereto with heat and pressure. The fixing apparatus is configured to direct a tip margin of the recording member toward the pressure applying member across a virtual linear extension line drawn from a downstream end to upstream end of the nip when only the tip margin exits from the nip. A fixing member side separation device may be separately provided from the surface of the fixing apparatus so as to separate the recording member exiting from the nip. A gap formed between the downstream end of the nip and the tip of the fixing member side separation device is set smaller than the width of the tip margin.

Sheet wrapping avoidable fixing apparatus and image forming apparatus

An air flow is generated in a space adjacent to the toner control member , when an image is not being formed, and also a cleaning electric field for moving the toner away from the toner control member is generated in the same space. For instance, a slit is formed in an outer peripheral section of a cylindrical and rotatable counter electrode member , and an air flow generating source such as a fan is connected to the counter electrode member . A convex cleaning electrode is formed around the slit of the counter electrode member , and a voltage for forming a cleaning electric field is applied from the power supply source for cleaning to this cleaning electrode

Image forming method and an apparatus for the same, and a cleaning device

An image forming apparatus, particularly a color image forming apparatus, of the present invention distinguishes a register mark and the background of a conveying member on the basis of the level of a signal representative of the background and the peak value or the bottom value of the signal. The apparatus can therefore accurately detect deviation between images of different colors and correct it.

Image forming apparatus which corrects deviations between images of different colors

An electrostatic plotter or similar color image forming apparatus for forming an image on a recording medium, e.g. a paper web being transported under tension by a transport roller pair by a head while sensing a register mark formed on the medium. The distance between the register mark and a register mark sensor and the distance between the paper web and the head are maintained constant.

Color image forming apparatus with means for biasing a recording head

The structure of a sheet-like electrostatic recording medium which may be configured as a roll and connected to ground via an electrostatic recorder with which it is usable. A connecting member is provided on at least one of axially opposite ends of the roll of the recording medium and electrically connected to an external electrode which is mounted on the recorder.

Structure of a recording medium for an electrostatic recorder

A color image forming apparatus of the type recording a register mark on a recording medium for registering the leading edges of images of respective colors to form a color image. The apparatus forms the register mark on the medium outside of the effective area of a main image and such that the mark extends perpendicular to an intended direction of medium feed. The register mark is developed in cyan and in the highest density to insure accurate register of colors. The register mark is cut off together with the leading edge of the medium.

Color image forming apparatus for use with a recording medium having a

A developing apparatus using a liquid developer and a developing head located to face a path along which a recording medium carrying, for example, an electrostatic latent image thereon is transported. A groove is formed in the surface of the head that faces the transport path. After development, the liquid remaining at the corner defined by the upper inner portion of the groove and the medium is rapidly collected to allow a minimum of smear to occur on the part of the medium which will be transported later. When the transport of the medium should be interrupted during development due to, for example, a jam, the liquid in the groove is collected to prevent a great amount of liquid which would smear a drive roller and other transport members from being transferred from the head to the medium.

Developing apparatus using a liquid developer and having a system for

Image forming equipment for performing a predetermined image forming operation by use of a stepwise drive source such as a stepping motor or pulse motor. Either one of a recording medium and a record head is driven by a pulse motor, and whether or not it has reached a predetermined position is determined. While such a decision as to the position of the recording medium or the record head is under way, the displacement per step is changed over to a displacement per step smaller than a displacement to be effected while the predetermined image forming operation is under way.

Image forming equipment with variable stepwise drive means operation

A composite copy of an image or images from a single or plural original sheets is formed by regulating the position or positions of the images from the original sheets on the copy sheet in a copy paper feeding direction and a direction orthogonal thereto. The setting of the image positions in the X and Y directions on the copy sheet is obtained by regulating the scanning of the original sheet, movement of the illumination system or optical system, or timing of movement of the photosensitive member or the copy sheet.

Method of positioning original image to be copied and apparatus for

A wet type electrophotographic copying machine of the type capable of performing one copy making process during substantially two revolutions of a photoconductor, which is provided with means for forming a liquid developer deposition portion by charging, exposure and development, on the downstream side of an image formation area on the photoconductor, the liquid developer deposition portion capable of substantially narrowing the gap between the photoconductor and a squeegee roller, whereby the squeezing of excess developer from the surface of the photoconductor can be performed at the squeezing initiation point on the photoconductor, thus attaining a sharp squeezing effect, and the adhesion of the excess liquid developer to an image transfer material can be prevented.

Wet type electrophotographic copying machine

A control system for electrophotographic copying machines which may forcibly return the component parts which are reciprocated and rotated during the copying operations to their home positions after a power switch is turned on, may detect malfunctions after the copying operations are started and may enable the copying machine to repeat the copying sequence without the feed of copying sheets for running tests in inspections and maintenance. One or more one-chip microcomputers are used in order to control the above and other steps so that a number of component parts may be minimized and the copying machines may be made compact in size and be economically fabricated.

Control system for electrophotographic copying machine

Growing community of inventors

Yokohama, Japan

Kiyoshi Ohshima