Kabushiki Kaisha Toshiba

Toshiba Kikai Kabushiki Kaisha

Toshiba Tec Kabushiki Kaisha

Toshiba Machine Co., Ltd.

Tokyo Shibaura Denki Kabushiki Kaisha

Toshihiro Kasai

Minoru Yoshida

Masashi Takahashi

Mitsuaki Kohyama

Kazuhito Kobayashi

Naoaki Ide

Jiro Egawa

Haruhiko Ishida

Naruhito Yoshida

Makoto Nishizawa

Hironobu Machida

Moriya Nagasawa

Junsuke Kawai

Tatsuya Tsujii

Takeshi Watanabe

Takao Izumi

Shoko Shimmura

Takashi Hatakeyama

Yukio Iimura

Shigenobu Osawa

Osamu Takagi

Masashi Hiroki

Shigeru Fujiwara

Kunihiko Miura

Rintaro Nakane

Jun Koike

Takashi Shimazaki

Mitsuaki Kouyama

Hideaki Kitta

Shinya Tomura

Fumiyuki Katoh

Shinichi Tazawa

Yoshiya Hashimoto

Shoko Seto

Tatsuhiko Maru

A nozzle touch mechanism () includes a base frame (), a stationary platen () to which a mold () is to be attached, and an injection mechanism (). The injection mechanism () is moved it toward the stationary platen () by means of a ball screw shaft (). A motor portion () which applies a pressing force to the mold () from a nozzle () is connected to one end () of the ball screw shaft (). A connection mechanism () is provided which is connected to the other end () of the ball screw shaft () and to the stationary platen () at a support located above the center of the nozzle (). When no pressing force is applied to the mold () from the nozzle () by the motor portion (), springs () can press the connection mechanism () in such a direction as to move it away from the stationary platen () with respect to the base frame ().

Nozzle touch mechanism and injection molding machine

There is provided an image forming apparatus comprising a developing device containing a toner having an average particle diameter of 2 to 5 &#x3bc;m and a spherical degree of 1 to 1.2, and a transfer member which is pressed against the image carrier by a pressing force having a total load of 150 g to 1500 g and a surface load of 10 to 150 g/cmat the time of transfer.

Image forming apparatus and method having a cleanerless image forming unit

A CPU controls a shutter of a developing device so as to enable movement of a developer between a first chamber and a second chamber that store the developer. The CPU rotates a developing roller and mixers of the first and second chambers for a predetermined time T, and stirs and conveys the developer. Thereby, the developer is moved from the first chamber into the second chamber. The amount of movement of the developer is understandable from the rotational speed and shape of each mixer. Hence, the amount of developer, which is moved from the first chamber to the second chamber, is estimated in advance, and about half the developer in the first chamber is replaced.

Image forming apparatus and control method using a two-component developer

An injection apparatus comprises a screw drive shaft, a motor which generates torque to rotate the screw, a speed reducer, and a power transmission mechanism. The power transmission mechanism has a first pulley on an output shaft of the motor, a second pulley on an input shaft of the speed reducer, and a belt passed around the first and second pulleys. The speed reducer is located between the second pulley and the screw drive shaft. The speed reducer is formed of a planetary gear mechanism, and both its input and output shafts are situated on an extension of an axis of the screw drive shaft.

Injection apparatus

Method for mold clamping of the present invention is capable of shortening a molding cycle without any initial setting works for an engaging position of a tie bars. The method is constituted the steps of moving the tie bars in the direction of mold closing during mold close operation, judging a relative moving speed between a movable die plate and the tie bar to be within a predetermined value, engaging the tie bars with the movable die plate mechanically by operating an engaging means when the relative moving speed is judged to be within the value, then further moving the movable die plate against a fixed die plate under engagement, and after contact of a movable mold with a fixed mold driving a mold clamping cylinder, thereby executing mold clamping operation.

Method and apparatus for mold clamping in an injection molding machine and the like

The tail end of a heating barrel is supported by a front plate. The tail end portion of a screw is rotatably supported by an intermediate plate. Bearings are built in the rear plate. The nut of each of ball screws is attached to the front surface of the rear plate through a hollow shaft and the bearing. Through holes are provided in the intermediate plate. To the front surface of the intermediate plate are fixed load cells so as to block the front of the through holes. The leading end portion of the threaded rod of each of the ball screws and leading end portion of the nut are inserted in each of the through holes. The leading end of the threaded rod is fixed to the rear surface of the load cell.

Injection unit of electric injection molding machine

A front plate and rear plate are connected to each other through a plurality of the bars. An intermediate plate is arranged between the front plate and the rear plate and guided by the tie bars to be movable. The front plate is fixed to a slide table. The rear plate and intermediate plate are supported by a linear slide guide on the slide table. A rear end portion of a barrel is fixed to a central area of the front plate. A rear end portion of a screw is supported by the intermediate plate with a bearing in between. A ball screw is incorporated in the rear plate and a forward end of a threaded rod of the ball screw is fixed to a central area of a back surface of the intermediate plate through a load cell.

Injection unit of injection molding machine

An mold thickness adjustable range S of a link housing included in a toggle type clamping unit for a thick mold of the greatest allowable thickness and that of the same for a thin mold of the smallest allowable thickness is divided into a plurality of sections. Extra elongations by which tie bars included in the toggle type mold clamping system are to be stretched for desired mold clamping forces are determined beforehand and are assigned to the sections of the mold thickness adjustable range S. One of the sections in which the link housing is positioned when the toggle type mold clamping system is set in a lock-up state in which a movable half mold is in contact with a fixed half mold is specified by a combination of binary signals provided by switches. The spacing between a movable platen holding the movable half mold and a fixed platen holding the fixed half mold is adjusted by adjusting the position of the link housing so that the tie bars are stretched by the extra elongation for a desired mold clamping force when the movable and the fixed half mold are clamped.

Method and apparatus for compensating mold thickness changes in toggle type clamping unit for injection molding machine

A color image forming apparatus according to the invention includes an intermediate transfer member for transferring a color image onto a paper sheet, a second transfer roller capable of directly transferring, onto a paper sheet, a toner image formed on a photosensitive member to transfer a black-and-white image onto a paper sheet, a first transfer roller for transferring, onto a paper sheet, a color image on the intermediate transfer member. Since the process of transferring a black-and-white image onto a paper sheet is separated from the process of transferring a color image from the intermediate transfer member, a black-and-white image can be transferred onto a paper sheet and fixed thereon immediately after development. Thus, the period required for copying a black-and-white image, in particular, the required first copying period of a black-and-white image can be shortened.

Image forming apparatus for superposing monochrome images

An image forming apparatus of the present invention includes a conveyer belt for conveying an image receiving medium toward an image carrier, an image transferring member for electrostatically transferring a developed image formed on the image carrier onto the image receiving medium conveyed by the conveyer belt by applying an electric charge through the back of the conveyer belt, and an adsorbing roller provided on the surface of the conveyer belt facing it for electrostatically adsorbing the image receiving medium to the conveyer belt. The electric resistance of the conveyer belt from a first position where the conveyer belt and the adsorbing roller are facing each other to a second position where the conveyer belt and the image carrier are facing each other is larger than the electric resistance between the image carrier and the image transferring member.

Image forming apparatus having a semiconductive transfer belt

An image forming apparatus includes at least two developing units containing two types of developing agents of different colors. This image forming apparatus is improved in the following points. i) The triboelectric charging amounts of the toner of the developing agents are reduced in the order of transfer. ii) The volume resistivities of the developing agents are reduced in the order of transfer. iii) The charging potentials of image carriers when electrostatic latent images corresponding to individual developing agents are formed are reduced in the order of transfer.

Image forming apparatus for forming an image on an image receiving

A color printer includes a conveyer belt for conveying a paper sheet to make the sheet pass through a plurality of photoconductive drums. A suction roller for sucking a supplied paper sheet on the conveyer belt is provided on the upstream side of the photoconductive drums in the conveying direction of the paper sheet, such that the suction roller is in rolling contact with the belt. Transfer chargers are provided at positions opposing the photoconductive drums, respectively, with the conveyer belt situated between the drums and the transfer chargers. The running distance L1 (mm) of the conveyer belt from a sheet peeling position corresponding to the photoconductive drum at the rearmost position to a suction position where the suction roller is provided, the volume resistance .rho. (.OMEGA..multidot.cm) of the belt, and the relative dielectric constant .epsilon. of the belt are set so as to satisfy a relation of L1/V.gtoreq.(.epsilon..multidot..epsilon..sub.0 .multidot..rho.).times.7.

Image forming apparatus with low ozone generation and improved image

This apparatus forms a multiplex image on a sheet of paper conveyed on a conveyor belt through a plurality of image forming stations and prevents any misregistration between the images on the paper by using a first charger to charge the conveyor belt and a second charger for charging the paper on the conveyor belt. The first charger supplies the conveyor belt with an electrical charge of a predetermined polarity before the paper is supplied thereon. The second charger charges the paper on the conveyor belt with an electrical charge of a polarity opposite to the predetermined polarity.

Image forming apparatus with a device for conveying an image receiving

A developing roller is opposed to a photosensitive drum on which a latent image is carried, and developer supplied to the latent image is held and fed by the developing roller. Developer is supplied from a feeding roller to the developing roller. A thickness defining blade is pressed against the feeding roller to press the feeding roller against the developing roller and form a developer layer of certain thickness on the feeding roller. A developing device thus arranged enables developer to be electrically charged without adding any stress to the developer, and a developer layer of certain thickness to be formed.

Growing community of inventors

Yokohama, Japan

Toshihiro Kasai