Sharp Kabushiki Kaisha Corporation

Shougo Iwai

Mitsuru Ogura

Akira Tamagaki

Toshiaki Kobayashi

Tetsuya Itoh

Tadashi Nakamura

Kunio Ohashi

Yoshiaki Ibuchi

Masaru Nishijima

Hiroshi Mori

Yoshihalu Fujii

Osamu Hashimoto

Yasuo Araki

Minoru Hashimoto

Toshikuni Kanagaki

Shizuo Yoshikawa

A toner for use in electrophotography in accordance with the present invention comprises toner particles and an external additive that is constituted by a silica fine powder composed of inexpensive silica particles coated with a mixture of homogeneously distributed tin oxide and antimony, and that is attached to the surface of the toner particles. The use of the silica fine powder improves the flowability of the toner whereby images with a uniform density can be obtained. In addition, the toner is stabilized as the above mixture lowers the electric resistance on the surface of the toner particles. The above external additive may also be composed of aluminum oxide fine powder or cerium oxide fine powder. For instance, with a toner for use in electrophotography that comprises an external additive composed of cerium oxide fine powder, the surface of the photoreceptor is polished though the polishing action of the cerium oxide whereby the formation of a toner film on the photoreceptor can be prevented and clear images can be obtained.

Toner for use in electrophotography and its manufacturing process

To indicate a remaining portion of a photosensitive sheet roll of material a method and apparatus are provided. A rotation detector is secured to a rotation system rotatively supporting a photosensitive sheet roll. A measuring device measures the amount of rotation of the photosensitive sheet roll, detected by the rotation detector, within a predetermined time or during a period of one cycle of an image forming process. An indicating device indicates the remaining amount of the photosensitive sheet roll according to the rotation amount measured by the measuring device.

Photosensitive sheet remaining amount detection device for image forming

An image forming apparatus which has a plurality of exposing optical systems used singly or jointly depending upon when an image is to be formed from different kinds of documents such as one is non-transmissive and the other is transmissive, or when a synthetic image is to be formed from different kinds of documents.

Image forming apparatus

A copying machine which projects a light image from different documents placed at different places onto the same exposure section in the photosensitive material along the respective different optical axes, thereby facilitating the changeover of the documents with the initially set optical axes being kept.

Copying machine with a slidefilm exposure device

A projection unit, which is mounted in a copying machine and used to project an image of a light permeable original onto a prescribed exposure point on a photosensitive material, comprising a light source for exposure in a box, an original holding means which holds the original in a prescribed position with respect to the light source and the photosensitive material and is disposed movably in the box so that the image of the original is scanned in a prescribed direction with respect to the photosensitive material, a driving means for moving the original holding means in the scanning direction, a transmission means provided between the original holding means and the driving means which is capable of moving between an engaged position in that the transmission means is coupled to the original holding means and driving means so as to transmit power of the driving means to the holding means and a disengaged position in that the transmission means is not coupled to the original holding means and the driving means, and a switching means for putting the transmission means into the engaged position or disengaged position.

Projection unit for a light permeable original in a copying machine

A rewind device for a photosensitive sheet in an image forming apparatus comprises a supply shaft reversing device which winds back the photosensitive sheet by rotating a supply shaft rotatively supporting a photosensitive sheet roll in the reverse direction to the drawing direction of the photosensitive sheet and a control device which measures a rotation amount of the photosensitive sheet roll in the drawing direction for the photosensitive sheet and that in the reverse direction. The control device is composed so that it may stop the winding back of the photosensitive sheet by the supply shaft reversing device in order to constantly wind back a fixed amount of the photosensitive sheet by comparing both of the rotation amounts.

Photosensitive sheet rewind device for image forming apparatus

An image forming apparatus with an image memory plate having a light image memory is disclosed. The light image memory stores image information of a document when reflected light having the image information from the document is projected onto a first surface thereof, and also reads out the image information stored therein in the form of reflected light when light is projected onto a second surface thereof by a light source. The image forming apparatus comprises a movable holder for detachably holding the image memory plate.

Image forming apparatus utilizing a light image memory

A shredder for feeding documents from a document loading portion to a document shredding portion so as to shred the documents by the document shredding portion, in which the document loading portion is constituted by a plurality of document loading apertures such that a total quantity of the documents capable of being fed from the document loading apertures to the document shredding portion is so set as to be not more than a shredding capability of the document shredding portion.

Shredder

A method of controlling transport of a photoreceptive sheet, including the steps of: feeding the photoreceptive sheet from a roll of the photoreceptive sheet to an exposure position subjecting the photoreceptive sheet to image forming exposure and transporting the exposed photoreceptive sheet to a buffer region; transporting the photoreceptive sheet disposed at the buffer region to an image forming position; and feeding the photoreceptive sheet disposed between the exposure position to the image forming position and the image forming position.

Method of controlling transport of photoreceptive sheet

An image forming apparatus includes an original document reader for respectively reading the each duplex face of the document from each side face; a means for filling-in the document images read respectively, with elements capable of being filled-in with laser heat through an electric-heat optical effect a device for optically reading each of the document images filled-in on the elements to focus the images on a photoelectric member; and a device for projecting the images onto a photosensitive member and to transfer them onto transfer paper, whereby both side faces of the original document are reproduced.

A cartridge containing a roll of photosensitive sheet and set inside an image formation apparatus has both an outlet and an inlet. Its interior is divided by a flexible sheet into a chamber originally containing the roll of unused photosensitive sheet and another chamber into which used portion of the sheet is collected through the inlet. A roller near the outlet for contacting the photosensitive sheet to thereby pull it out of the cartridge operates only for a specified length of time or until a specified length of an uncoated leading section of the photosensitive sheet is pulled out and thereafter the roller is removed from the contacting position with the photosensitive sheet so as not to contact and damage the microcapsule-coated part of the photosensitive sheet which follows the leading section.

Image formation apparatus with cartridge for roll of photosensitive sheet

A cartridge for containing a roll of photosensitive sheet and to be mounted inside an image formation apparatus is comprised of a box for containing a roll of unused photosensitive sheet and a shaft which is unistructurally formed with the box and serves to wrap up the used part of the photosensitive sheet. The shaft has adhesive sections such that the photosensitive sheet to be wrapped therearound can be securely attached thereonto.

Image forming apparatus with detachable cartridge

An image formation apparatus has a detachably attached cartridge having a box for containing a roll of unused photosensitive sheet and a take-up shaft which is unistructurally formed with the box and serves to wrap up the used part of the photosensitive sheet. Holding plates which serve to guide the used part of the photosensitive sheet towards the take-up shaft are pressed against the take-up shaft automatically when a cover for the cartridge is opened.

Image formation apparatus with a cartridge for a roll of photosensitive

A shredding machine which comprises a pair of juxtaposed cutting rollers for shredding paper material, a paper feed tray movable between lowered and elevated positions and adapted to support thereon the paper material to be shredded, a feed roller assembly for feeding the paper material from the paper feed tray towards the cutting rollers, a protective cover supported for movement between closed and opened positions and for covering a space above the paper feed tray when in the closed position; and a control for moving the paper feed tray from the elevated position towards the lowered position in response to the movement of the protective cover from the closed position towards the opened position.

Shredding machine

A shredding machine includes a pair of juxtaposed cutting rollers for shredding paper material, a movable paper feed tray for supporting the paper material to be shredded on it, a paper feed tray drive motor capable of moving the paper feed tray between lowered and elevated positions, a paper feed mechanism and a control circuit for controlling the shredding operation. The paper feed mechanism comprises paper feed rollers for feeding the paper material from the paper feed tray towards the cutting rollers, a paper feed roller drive motor for driving the paper feed rollers and an actuator for detecting the position of the uppermost paper of a stack of papers placed on the paper feed tray. The operation of the paper feed mechanism is interrupted in the case where the actuator is not activated by the stack of papers over a predetermined period of time. Abnormal conditions of the drive motors can be detected by the control circuit on the basis of an electric voltage being supplied to each motor.

Growing community of inventors

Yamatokoriyama, Japan

Shougo Iwai