Kabushiki-kaisha Kip

Katsuragawa Electric Co., Ltd.

Nobutaka Noda

Kazuo Hamamura

Tatsuji Takizawa

Yoichi Morita

Masakazu Yoshino

Tomoyuki Ishida

Tetsuo Murase

A method and an apparatus for forming an electrophotographic image based on applying an AC voltage or a voltage obtained by superposing a DC voltage on an AC voltage to an electroconductive base of a sensitive medium having a photoconductive layer formed on the electroconductive base, bringing a grounded electroconductive or semi-electroconductive member into contact with or close to the surface of the sensitive medium to charge this surface to a predetermined polarity, and exposing the surface of the sensitive medium to an image to form an electrostatic image.

Method and apparatus for forming electrophotographic image

A method for developing an electrostatic latent image comprises the steps of attracting a developer comprised of a magnetic toner and a magnetic carrier onto the surface of a sleeve with a magnet roll disposed therein, rotating the magnet roll and the sleeve in the direction opposite to the rotational direction of an image carrier to move the developer in the same direction as the sleeve, and supplying the developer onto the image carrier under an alternating electrical field and an alternating magnetic field to thereby conduct development. An apparatus for effecting the method comprises a casing for accommodating the developer; the magnet roll arranged to be rotated in the direction opposite to the rotational direction of image carrier; the sleeve arranged to be rotated in the same direction as the magnet roll; and an alternating electrical field applying means.

Method and apparatus for developing electrostatic latent images

A method and a device for controlling a toner concentration of a dry developing agent used in an electrophotographic apparatus wherein an electrostatic latent image is developed by a dry developing agent including toner and magnetizable carrier used to be circulated, and wherein a toner is appropriately and timely supplied to the developing agent to maintain a toner concentration within a predetermined value. The developing agent is directed to flow on an inclined member disposed on a portion of a path of circulation of the developing agent, and when a depth of the flow of the developing agent on the inclined member is reduced below a predetermined value, the toner is supplied to the developing agent.

Controlling toner concentration of dry developing agent in

A method and apparatus of electrophotography wherein before exposure of a photosensitive element to a light image the element is subjected to a substantially uniform light irradiation to release a part of the charge carriers trapped in a photoconductive layer of the element, thereby controlling the potential of a latent image to be formed on the element within a range fit for the development of the latent image.

Device for controlling potential of latent image for use in

Method of electrophotography

A cleaning device for use in an electrophotographic apparatus for removing developer toners remaining on the surface of the photosensitive element after transfer printing a developed image therefrom to a receptor sheet. The cleaning device is provided with a cleaning device comprising a resilient inner member and an outer member provided thereon and frictionally contacted with the element to generate triboelectrical charges of opposite polarity to that of charges existing on the photosensitive element, at the time of being in frictional contact therewith.

Cleaning devices for use in electrophotographic apparatus

A device for controlling advance and return movements of an original table of an electrostatic copying apparatus wherein the table is advanced in timed relationship with the movement of a photosensitive element and returned under the action of a spring to its initial position comprising a first shaft rotatable in timed relationship with the movement of said photosensitive element, a second shaft rotated at a predetermined speed in one direction, a stepped pulley mounted on said first shaft for free rotation relative thereto, a first pulley co-axially mounted on said first shaft through an one-way clutch operable when said first pulley rotates relative to said second shaft in said direction of rotation thereof, a first wire passing around said first pulley and which is connected at its one end to a smaller diameter portion of said stepped pulley and at the other end through a spring to said original table, a second wire passing around a larger diameter portion of said stepped pulley and connected at its opposite ends to said original table for movement therewith, ratchet means provided on said stepped pulley for pivotal movement under resilience, latch means operable to engage with said ratchet means at the initial position thereby initiating the advance movement of said original table while tensioning said spring, releasing means for releasing said latch means to disengage said stepped pulley from said first shaft at a predetermined angular position thereof thereby causing the return movement of said original table under the action of said spring to the original position, and operating means for selectively operating said ratchet means at the initial position to cause engagement between the latter and said latch means.

Growing community of inventors

Kawasaki, Japan

Nobutaka Noda