Hitachi Koki Co., Ltd.

Shigeo Nemoto

Isao Nakajima

Kunitomo Takahashi

Satoshi Aita

Keiji Kataoka

Youji Hirose

Shuuho Yokokawa

Muneyoshi Akai

Susumu Saito

Yukio Otome

Sho Sawahata

Shuho Yokokawa

Kazuhiro Akatsu

Yasuyuki Tsuji

Toshitaka Ogawa

Yasuo Kikuchi

Isao Watanabe

Tomio Sugaya

Osamu Namikawa

Toru Kikuchi

Hidenori Iwanaga

Youichi Takeuchi

Hidenori Takayasu

Hitomi Shimizu

Sigenobu Katagiri

Osamu Ohuchi

Katsuhito Komoda

Kiyomi Tsuchiya

An exposure device of an electrophotographic apparatus which includes a rotary polyhedral mirror for scanning a plurality of laser beams on a photosensitive body, a beam interval adjusting member for adjusting an interval between the laser beams, a rotating mechanism for rotating the beam interval adjusting member, and an optical path position deciding device disposed on the side of the rotary polyhedral mirror in a laser beam advancing direction at the time of adjustment of the laser beam interval, the beam interval adjusting member being rotated so that the optical paths of the laser beams are decided by the optical path position deciding device. The optical path position deciding device may include a plate-like member with boresights or a CCD sensor and a CRT display.

Exposure device of electrophotographic apparatus with optical path

A toner supply control system of the electrophotographic apparatus which includes a developing unit 3 for developing with a developer composed of toner and carrier; a toner hopper 4 for storing the toner; a toner empty sensor 7 for detecting the remainder of toner in the toner hopper 4; and a toner supply drive unit 5 for conveying toner from the outside of the apparatus into the toner hopper 4. Toner is conveyed from the outside into the toner hopper 4 by driving the toner supply drive unit 5 over a predetermined period of time without stopping the operation of the electrophotographic apparatus when the toner empty sensor 7 detects over a predetermined period of time that the remainder of toner in the toner hopper 4 is small. Then the existence of an output signal outputted from the toner empty sensor 7 indicating that the remainder of toner is small is detected, and a previous signal of toner shortage is output while the developing operation of the electrophotographic apparatus is being maintained in the case of existence of the output signal, and the shortage of toner is reported to an operator in accordance with the previous signal of toner shortage.

Toner supply control system for an electrophotographic apparatus

A simple optical recorder which permits alignment of scanning positions of a plurality of laser beams with high accuracy and effects optical recording using the laser beams. The optical recorder is provided with a photosensitive drum which is scanned by a plurality of laser beams formed in rows at an inclined angle with respect to the direction of scan, a single photosensor for sensing each of the sweep positions of the laser beams, and a controller for controlling the scanning positions of the laser beams on the basis of a sensing result of the sensor. The controller is made up of an optical sensing signal separation circuit, synchronous clock generation circuits, FIFO memory circuit elements, and OR circuits.

Optical recorder having a signal separation circuit and a FIFO memory

In a printing sheet conveying device in which a sheet bearing a toner image is passed through a heating roll and a pressure roll, and which has means for changing the right and left contact pressures of these rolls to correct the meandering movement of the sheet when conveyance of the sheet is started; in which when conveyance of the sheet is started, the contact pressure of the rolls is made higher on one of the right and left sides than on the other side, and in a predetermined period of time the contact pressures on both sides are made equal to each other.

Sheet meandering movement preventing method

Growing community of inventors

Ibaraki, Japan

Shigeo Nemoto