Matsushita Electric Industrial Co., Ltd.

Yukinori Hara

Hisanobu Matsuzoe

Kouji Migita

Masashi Ogawa

Yusuke Shiibara

Shinichi Kizu

Yasunori Sagara

Kazuo Hakukawa

Masahiro Samei

Tomoyuki Noguchi

Kazunori Matsuo

Koji Migita

Toshihito Tanaka

Shinichiro Tsunematsu

Yusuke Matsushita

Tetsuya Adachi

Shuji Narahara

Koichi Umeno

Susumu Uemura

Masanori Goto

A printer includes, in its fixing device operable to fix toner particles onto a recording medium, a heating roller containing magnetic metal, a fixing roller disposed parallel to the heating roller, an endless belt containing magnetic metal bridged across the heating roller and the fixing roller. The printer also includes a press roller pressed to the fixing roller via the endless belt and the recording medium, and a coil core being operable to produce magnetic fields so as to cause both of the heating roller and the endless belt to generate heat with the magnetic metals contained therein.

Printer and fixing device which maintain a stable temperature for fixing a toner image

An optical scanning apparatus is configured to comprise (a) a deflector for deflecting and scanning a plurality of bundled incident laser beams, (b) a conversion optical system for converting the bundle of laser beams moving at a constant angular velocity into a bundle of laser beams moving at a constant linear velocity, (c) reflection mirrors for separating the bundled laser beams into four corresponding to respective colors, (d) photosensitive members for forming respective electrostatic latent images by means of the laser beams corresponding to the respective colors, wherein one of the photosensitive members is disposed on a plane parallel to an area defined by the laser beams traveling between the deflector and the conversion optical system and (e) a correction optical system for correcting curvatures of field with respect to the respective laser beams and leading the laser beams to the photosensitive members.

Optical scanning apparatus for preventing color misregistration

The fixing device includes a heating roller made of magnetic metal and heated by electromagnetic induction; a fixing roller disposed parallel to the heating roller; an endless toner heating medium belt bridged across the heating roller and the fixing roller, and a press roller pressed to the fixing roller via the toner heating medium. The press roller rotates in the same direction as the toner heating medium belt to form a fixing nip region, and the belt is heated by the heating roller and rotated by the two rollers. The construction of the present invention achieves stable temperature control of the toner heating medium, and provides a stable fixing quality of the toner image.

Toner image forming device with belt heated by electromagnetic induction heating

When a photoreceptor unit and a developing unit are combined with each other, the photoreceptor does not come into direct contact with the developing unit. Accordingly, it is possible to prevent generation of scratches on the surface of photoreceptor, and lowering of electrostatic sensitivity due to scratches may be prevented. As a result, an excellent image will be formed. It improves the efficiency in the manufacture of image forming apparatus. A method of manufacturing an image forming apparatus of the present invention includes a process of applying a toner to the surface of developing roller and a process of making the developing roller with the toner applied thereto come into contact with the photoreceptor to combine the developing unit and the photoreceptor unit with each other. Preferably, the manufacturing method further includes a process of performing functional tests of a finished image forming apparatus.

Method of manufacturing an image forming apparatus with toner applied to a development unit

Paper-feed control of an image-forming apparatus, in which the control unit has a paper-feed-motor-drive-controller for controlling a paper-feed-motor. The paper-feed-motor rotating a resist roller and a paper ejection-roller for feeding printing paper. The paper-feed-motor is controlled to perform a plurality of paper-feeds of predetermined width on a sheet of printing paper. An image is formed on the sheet of printing paper after respective paper-feed. The paper-feed-motor is controlled by the paper-feed-motor-controller to perform the paper-feed such that the end of the printing paper remains in contact with the resist roller from which the end of the paper leaves after the final paper-feed.

Paper-feed control unit and method of control for image-forming apparatus

Image forming device

Image forming device and method for transferring a toner image onto a

A transverse-type image forming apparatus in which a toner image carried on an endless toner image carrying belt is transferred to a printing paper by a transfer facing roller provided inside the toner image carrying belt and caused to move along the printing paper. A transfer bias voltage is applied to a transfer plate, on which the printing paper is set, during the backward movement of, or during both the forward and backward movements of, the transfer facing roller, so as to cause the toner image to be electrostatically attracted to the printing paper. The uneven transfer of the toner image is reduced.

Transverse type image forming apparatus

A support member has a plurality of through-holes for supporting printing paper to which a fusible toner is adhered. Hot air is blown toward the printing paper. By releasing a considerable amount of hot air blown toward the support member downward through the through-holes, the amount of hot air bouncing on the surface of the support member is decreased. Thus, floating or fluttering of the leading end of the printing paper is prevented when the leading end of the printing paper rushes into the fixing apparatus.

Fixing apparatus

A toner image onto a print form by pressing a photosensitive material belt against a transfer plate through movement of a transfer opposite roller. The photosensitive material belt running in a direction orthogonal to the supply direction of the print form on a transfer plate. The photosensitive material belt is stably maintained at a region completed for transfer in an attitude following the upper surface of the print form.

Image forming apparatus with reduced flexural deformation of endless belt

An image display unit including an endless transfer belt that is tensioned by a plurality of rollers. A toner image carrier is tensioned in a direction orthogonal to the rotational direction of the transfer belt. An image formation system provides a toner image carrier with a toner image. A transfer roller disposed inside the toner image carrier permits transfer of the toner image to the transfer belt by orthogonal rotation as compared to the rotational direction of the transfer belt. The transferred image is displayed, then erased by a cleaning blade.

Image display unit having transfer belt and orthogonally tensioned

A toner printing machine includes an image forming device forming a toner image on a workpiece, and a heating member from which a heat energy is supplied to the toner image to be fixed to the workpiece, wherein the heating energy is supplied to the toner image while preventing a contact heat energy transmission between the heating member and the toner image.

Toner printing machine and method for fixing toner image

In an image forming apparatus of transverse transfer type, toner images, carried by a toner-image carrying member extended by a plurality of rollers in a direction perpendicular to a direction of feed of printing paper, are transferred by a transfer opposed roller to the printing paper in a direction perpendicular to the direction of feed of the printing paper to be fixed. Among the rollers extending the toner image-carrying member, at least one of those rollers except for the transfer opposed roller, which comes closest to the transfer opposed roller at starting and terminal ends of a longest path of movement of the transfer opposed roller, respectively, is provided at a position spaced from a transfer surface of the printing paper, to which the toner images are transferred, by a distance larger than a diameter of the transfer opposed roller. With this construction, a non-transfer region, in which the transfer opposed roller can not move, is reduced, and therefore a body of the image forming apparatus can be made smaller in size.

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Fukuoka, Japan

Yukinori Hara