Hitachi Koki Co., Ltd.

Hitachi, Ltd.

Hitachi Metals, Ltd.

Hitachi Koki

Ryoji Kojima

Kenji Okuna

Tsutomu Iimura

Katsumi Muroi

Takao Umeda

Masayasu Anzai

Hidefumi Ohtsuka

Katsuhiko Suzuki

Tadahiro Kaneko

Michio Yokosuka

Sayoko Oba

Takaomi Nishigaito

Katsubumi Ouchi

Sayoko Ohba

Keisuke Kurihara

Kastubumi Ouchi

Hidefumi Otsuka

A fixing system for fixing toner images onto an image printing system such that the image printing medium bearing the toner images on the obverse side and the reverse sides thereof is passed through a nip area between a pair of fixing rollers. In the nip area, a rotation speed of a first fixing roller, which comes into contact with a not-yet fixed toner image, which is formed on the obverse side of the image printing medium, is set to be substantially equal to a rotation speed of a second fixing roller, which comes in contact with a not-yet fixed toner image, formed on the reverse side of the image printing medium. This is accomplished by setting the diameters of the various layers of the first fixing roller to be equal to that of the second fixing roller. When the image printing medium is moved through the nip area by the fixing rollers, a moving speed of the upper side of the image printing medium is equal to that of the lower side thereof. Thus, stresses on the image printing medium are not caused, and no character blur takes place.

Apparatus for printing on both sides of an image printing medium by one

In an electrostatic both-side printing system, a first image forming unit is provided upstream of an image printing medium when viewed in the transporting direction of the image printing medium, and a second image forming unit is provided downstream of the image printing medium. A medium transporting path for transporting the image printing medium is formed between the first and the second image forming units. A first transferring unit, located facing the first image forming unit with the medium transporting path intervening therebetween, for applying no charge onto the rear side of the image printing medium, which does not face the first image forming unit. A second transferring unit being located facing the second image forming unit with the image printing medium with the medium transporting path intervening therebetween, in a state that the second transferring unit is apart from a first toner image formed on the image printing medium by the first image forming unit. In the both-side printing system thus constructed, the first and the second image forming units, and the first and the second transferring units cooperate to form first and second toner images on both sides of the image printing medium, the first and the second toner images being opposite in polarity.

Apparatus for printing images on both sides of an image printing medium

An image recording apparatus including a recording electrode having electrode needles aligned in columns, a driving circuit for individually applying an image recording voltage to the electrode needles of the recording electrode, a recording medium composed of a conductive layer and a surface insulating layer, and a voltage circuit for applying a predetermined voltage between the recording medium and the electrode needles, whereby fog on the recorded image can be avoided.

Image recording method and apparatus

A printing machine according to the present invention, comprises electrically conductive and magnetically inductive printing toner, an array of electrode-needles contacting with toner, each of the electrode-needles arranged apart from the adjacent electrode-needles in the array and individually energized in accordance with a desired printing pattern to electrify the toner communicating electrically with the energized electrode-needle, recording means including an electrically conductive portion and an insulating surface which extends on the electrically conductive portion and is arranged away from the array of electrode-needles to face thereto and to contact with the toner arranged between the electrode-needles and the insulating surface, the voltage applied to the electrically conductive portion being positive when the voltage applied to the energized electrode-needles is negative or the voltage applied to the electrically conductive portion being negative when the voltage applied to the energized electrode-needles is positive so that the toner electrified by the energized electrode-needle is attracted and attached to the insulating surface by the electrically conductive portion, the insulating surface moving in relation to the array of electrode-needles so that the toner is attached to an area of the insulating surface, magnetic means for attracting the magnetically inductive printing toner to form toner chains between the array of the electrode-needles and the insulating surface, and transferring means for transferring the toner from the insulating surface to a work piece, wherein longitudinally extending surfaces of the electrode-needles face to the insulating surface to electrify the printing toner arranged between the electrode-needles and the insulating surface.

Printing machine

An electrostatic recording head for causing a developing agent to be electrostatically deposited on the surface of a recording member in accordance with a recorded image, comprising a recording electrode having a plurality of linear electrodes arranged in a common plane at a predetermined interval; a magnet disposed at one side of the recording electrode; and a magnetic member disposed at the side of the recording electrode opposite to the magnet; the magnet being disposed such that the magnetic lines of force pass through the end of the recording electrode towards the portion of a recording member opposed by the end of the recording electrode. The present invention also relates to a method of producing this electrostatic recording head. The invention also is concerned with an image recording apparatus which employs this electrostatic recording head, as well as with a developing agent supplying device and a display device.

Electrostatic recording head, image recording apparatus, developing

A method and an apparatus for recording an image is disclosed, in which toner is supplied between a conductive recording drum covered with an insulating material and recording electrodes with the forward end thereof with a small gap from the drum and inclined at a great angle upstream of the direction of rotation of the recording drum. A toner carriage force is generated in the toner to flow out downstream by rotation of the recording drum. A permanent magnet is arranged in the recording drum to form a toner chain inclined at a great angle downstream of the recording drum from the forward end of the recording electrodes. The component of the magnetic force of the magnet in the direction of drum movement is balanced with the toner carriage force. Upon application of a recording voltage to the recording electrodes under this condition, the toner of the most downstream toner chain in contact with the drum surface develops a force of adhesion to the recording drum so that the drum rotates downstream with the toner attached thereon, thus forming an image due to the toner on the recording drum.

Method and apparatus for image recording

Growing community of inventors

Katsuta, Japan

Ryoji Kojima