Mita Industrial Co., Ltd.

Shigeo Koyama

Nobuhiko Kozuka

Ryutaro Yamagata

Hiromi Sakata

Atsushi Kano

Eiji Tsutsui

Hitoshi Nishihama

Kazutada Sakai

Takeshi Watanabe

Hiroyuki Tanaka

Masanobu Maeshima

Tatsuo Aizawa

Kenichi Satake

Hiroaki Tsuchiya

Eiji Nimura

Kikunosuke Tsuji

Hiroshi Kusumoto

Ichiro Takahashi

Kazuhiro Kobayashi

Yoshizo Kawamori

Wataru Yoshida

Masami Kai

Masao Otsuka

Setsuo Hori

Kazuhisa Edahiro

Katsushi Horihata

Yasusuke Tohi

Satoshi Uemori

Kohichi Baba

Hideki Matsumoto

Hiromi Sakato

Toshihiro Sato

Eiji Etoh

Hiroyuki Maede

Hidekazu Shouno

Yoshiko Kawachi

Sohei Matsuo

An ink jet printing apparatus includes a printing head operable to emit ink onto a printing sheet, the printing head being movable along a first direction; a sheet transporter operable to transport the printing sheet along a second direction perpendicular to the first direction; a head moving mechanism operable to reciprocally move the printing head along the first direction; and a controller which controls the sheet transporter and the head moving mechanism to execute a first printing mode of moving the printing head while holding the printing sheet in a stationary position and a second printing mode of moving the printing sheet while holding the printing head at a stationary position.

Ink jet printing apparatus

The present invention relates to an image forming apparatus such as a copying machine. In the image forming apparatus according to the present invention, a sealing member is interposed between a transparent platen on which an original is put and a frame member on which the transparent platen is mounted. Therefore, the sealing properties between the transparent platen and the frame member on which the transparent platen is mounted are improved, thereby to make it possible to prevent external air from entering the apparatus from a portion between the frame member and the transparent platen. As a result, it is possible to prevent image degradation and an increase in toner consumption.

Image forming apparatus

An image-forming machine includes a detachably mountable process unit. The process unit has a rotatable drum having an electrostatographic material thereon, a corona discharger, a developing device and a cleaning device. The developing device includes a development housing for holding a developer, a developer applicator for applying the developer to the electrostatographic material, and an agitating device for stirring the developer in the development housing. An agitating member of the agitating device is arranged to prevent damage of the agitating device due to forces resisting agitation motion by the agitating member. The developer applicator has a sleeve member for holding a developer on its surface, and a developer regulating blade which regulates the developer layer thickness, on the surface of the sleeve member, to provide an uniform developer thickness in the width direction. The cleaning device includes a toner removing device for removing residual toner from the electrostatographic material, a toner collecting chamber and a toner conveying passage extending from the toner recovery housing to the toner collecting chamber. The toner removing device includes a cleaning blade which, when the process unit is mounted at a predetermined position in the image-forming machine, is moved from a non-operative position away from the electrostatographic material to an operative position wherein it is brought elastically into contact with the electrostatographic material. A toner conveying device having a coil is disposed in the toner conveying passage.

Image-forming machine with improved developer agitating means, developer

An image-forming machine includes an image-bearing member having a photosensitive material on its surface, a latent electrostatic image-forming device for forming a latent electrostatic image corresponding to image information on the photosensitive material, a developing device for developing the latent electrostatic image, a transfer device for transferring the toner image from the photosensitive material to a sheet material, a conveying mechanism for conveying the sheet material through a transfer zone, and a receiving section for receiving the sheet material conveyed through the transfer zone. An assembly provides an improved cooperation of an optical device of the image-forming device, a sheet receiving section and the developing device. A further assembly maintains a process unit having the image-bearing member and an optical unit having the optical device in a predetermined positional relationship. Another assembly facilitates mounting and detachment of the image-bearing member on and from a process unit frame.

Image-forming machine with improved process and optional unit assemblies

A sheet feeding system for an image-forming machine includes a main body having a conveying passage therethrough for guiding sheet materials and a hand insertion feed table pivotally attached to the main body for movement between a feed position in which it can be used to feed sheet materials into the conveying passage and a storage position. The sheet feeding system also includes a separate feed unit which, when the table is in its storage position, can be aligned with the main body so that sheet materials can be fed therefrom into the conveying passage. The conveying passage guides sheet materials to either a receiving section, a sorter or back into the introduction opening of the conveying passage so as to form overlapping images. An auxiliary receiving member is pivotally mounted in the receiving section for movement between a first position in which it acts to guide sheet materials from the conveying passage into the receiving section and a second potion in which it acts to guide sheet materials either to the sorter or back into the introduction opening of the conveying passage. An upper cover member is also pivoted to the main body and acts as both a cover and a guide member.

Image-forming machine

An image-forming machine having a main body and a process unit adapted to be detachably mounted on the main body. The process unit includes a first unit having a developing device and a charging corona discharger and a second unit having a rotating drum and a cleaning device. The developing device comprises a magnetic brush mechanism comprised of a hollow cylindrical sleeve and a permanent magnet disposed within the sleeve and a blade adapted to be brought into press contact with the surface of the sleeve and to decrease sufficiently the thickness of the developer layer on the sleeve surface. The cleaning device includes an elastic blade adapted to be brought into press contact with a photosensitive member disposed on the surface of the rotating drum. The toner removed from the surface of the photosensitive member by the action of the elastic blade is recovered into an interior space of the rotating drum.

A sheet feeding system for an image-forming machine includes a main body having a conveying passage therethrough for guiding sheet materials and a hand insertion feed table pivotally attached to the main body for movement between a feed position in which it can be used to feed sheet materials into the conveying passage and a storage position. The sheet feeding system also includes a separate feed unit which, when the table is in its storage position, can be aligned with the main body so that sheet materials can be fed therefrom into the conveying passage. The conveying passage guides sheet materials to either a receiving section, a sorter or back into the introduction opening of the conveying passage so as to form overlapping images. An auxiliary receiving member is pivotally mounted in the receiving section for movement between a first position in which it acts to guide sheet materials from the conveying passage into the receiving section and a second portion in which it acts to guide sheet materials either to the sorter or back into the introduction opening of the conveying passage. An upper cover member is also pivoted to the main body and acts as both a cover and a guide member.

Process unit for copying machine

A drum unit exchange time indicating device for image forming apparatus comprises, an integrated signal output means to give output of integrated signal added up according to the time of use of the drum unit, a life signal output means to give output of drum unit life signal when said integrated signal exceeds predetermined value and a paper-feed mode changing means to change the mode of paper-feeding into an extraordinary mode when said drum unit life signal is detected.

Drum unit exchange time indicating device for image forming apparatus

An electrostatic photographic copying machine provided with a sorter includes structure for mechanically connecting the sorter to a body of the electrostatic photographic copying machine so that the sorter can be moved between a first position adjacent the body and a second position spaced from the body in the direction of discharge of paper sheets with an interval therebetween. Thereby, copying paper sheets can be easily and rapidly removed from the sorter and a fixing apparatus of the machine if they become stopped up or jammed therein.

Electrostatic photographic copying machine provided with a movable sorter

A shell-type electrostatic copying apparatus comprising a supporting structure comprised of a lower supporting frame and an upper supporting frame pivotally mounted on the lower supporting frame, a rotating drum rotatably mounted on the supporting structure, a copying paper feed device and a copying paper conveying mechanism including a plurality of lower elements and a plurality of upper elements for conducting a copying paper delivered from the paper feed device to the rotating drum. A conveying unit frame is pivotably mounted on the supporting structure. At least one of the upper elements is mounted on the conveying unit frame, and at least one of the lower elements, on the lower supporting frame. The apparatus also includes a drum unit frame having the rotating drum rotatably mounted thereon. A provisional unit placing means for supporting the drum unit frame movably is provided in the lower supporting frame and/or the conveying unit frame. The drum unit including the drum unit frame is provisionally placed on the provisional unit placing means, and then in the required manner, mounted detachably on the upper supporting frame.

Shell-type electrostatic copying apparatus

A variable magnification electrostatic copying apparatus includes a stationary transparent plate for placing thereon a document to be copied, an optical system including a first reflecting mirror assembly adapted to be moved reciprocally along the transparent plate, a second reflecting mirror assembly adapted to be moved reciprocally at a speed equal to one-half of the moving speed of the first reflecting mirror assembly and a lens assembly to be held at any one of a plurality of positions corresponding to a plurality of projecting ratios, and a projecting ratio changing device for moving the lens assembly and the second reflecting mirror assembly so as to change the projecting ratio of the optical system. The projecting ratio changing device includes a drive source in the form of a stepping motor, a control for controlling the operation of the drive source, a setting member for moving the second reflecting mirror assembly, a first power transmission system interposed between the drive source and the setting member and a second power transmission system interposed between the drive source and the lens assembly. The second reflecting mirror assembly is moved through the first power transmission system and the setting member, and the lens assembly is moved through the second power transmission system. An exposure correcting device includes plural plates movable between non-operating positions to respective operating positions controlling the area of exposure. The control includes high and low speed rotating plates and optical detectors for detecting positions thereof and for controlling the stepping motor.

Variable magnification electrostatic copying apparatus

A copying machine paper supply system includes a space for housing paper supply cassettes and at least two paper supply rollers and cassette-holding members installed in such space. The paper supply rollers and cassette-holding members are arranged in a vertically staggered manner with a lower one arranged inwardly, in the direction of insertion of a paper supply cassette than an upper one, and with each cassette supported only at opposite sides thereof.

Paper supply system of copying machine

A copying paper conveying device for conveying a sheet of copying paper having an upper and a lower introducing passage and a main conveying passage extending from a point of meeting of the upper and lower introducing passages. A pair of conveyor rollers are disposed in the upper introducing passage, and a pair of timing rollers are diposed in the main conveying passage. At least the downstream sections of the upper and lower introducing passages are partitioned by a common guide plate, and at least the downstream section of the common guide plate is formed of a flexible material. When a copying paper is conveyed through the upper introducing passage and the main conveying passage, the pair of conveying rollers are actuated in relation to the operation of the pair of timing rollers, and the copying paper is maintained bent between the pair of conveying rollers and the pair of timing rollers at least until the trailing edge of the copying paper leaves the pair of conveying rollers.

Copying paper conveying device in electrostatic copying apparatus

A toner replenishing device for replenishing toner to a developing device in an electrostatic copying apparatus includes a storing box extending in approximately a horizontal direction, a supply roller provided at a supply port at an end of the storing box, pairs of wheels respectively provided at opposite ends of the storing box, a pair of endless stretched members passed around the wheels, a stirring and supply rod provided between the endless stretched members, and a device for driving the wheels so as to move the lower portion of the endless stretched members toward the supply roller.

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Ibaraki, Japan

Shigeo Koyama