摘要:
An electrophotographic apparatus comprising a corona charger, a photosensitive and electrostatic-charge retentive drum including an electrically conductive substrate and a photosensitive layer having a narrower width than that of a record paper, and a screening member inserted between the corona charger and a peripheral part of the photosensitive and electrostatic-charge-retentive member for gradually decreasing a quantity of electrostatic charge charged at side edge portions of the photosensitive layer in a direction toward the side edges of the photosensitive layer, whereby black line and stripe can be prevented from appearing along the side edges of the record paper.
摘要:
An electrophotographic apparatus for producing one or more copied images of an original by forming an electrostatic latent image of the original on a photosensitive member whose width is narrower than that of a recording paper, developing the latent image, and transferring the developed image onto the recording paper, the apparatus including a device for removing electric charge from edge portions of the photosensitive member after said transferring but before next succeeding development of said latent image in the course of repeating developments and transferrings of one electrostatic latent image formed on said photosensitive member.
摘要:
A duplicating system comprises an electrophotographic copying apparatus which includes a first optical scanning system for making a slit exposure, a first document feeder for feeding a first document to be copied at a first speed with respect to the first optical scanning system, a rotating photosensitive drum for forming an electrostatic latent image corresponding to the image of document, and means for forming a duplicated copy with the aid of the latent image; and an option device detachably mounted onto the copying apparatus and comprising a second optical scanning system for making a slit exposure, a second document feeder for feeding a second document to be copied at a second speed with respect to the second optical scanning system and an optional optical system for projecting the image of second document onto the photosensitive drum. The first document feeder in the copying apparatus and the second document feeder in the option device are so constructed that the first and second documents are fed in the same direction.
摘要:
An electrographic apparatus comprising a main body, a manuscript discharge tray, a slit light exposure portion, a manuscript feed mechanism including upper and lower feed mechanisms, the upper feed mechanism being arranged movably with respect to the lower feed mechanism, a photosensitive body, a sheet manuscript edge guide, a thick manuscript edge guide and means for automatically changing the two edge guides in response to a movement of the upper feed mechanism with respect to the lower feed mechanism; the apparatus being constructed and arranged such that in the case of obtaining copies of a sheet manuscript the sheet manuscript is fed by the manuscript feed mechanism under a condition that the upper feed mechanism is mounted on the lower feed mechanism and scanned by exposed light by one time and in the case of obtaining copies of a thick manuscript a thick manuscript carriage on which is disposed the thick manuscript is fed by the lower feed mechanism under a condition that the upper feed mechanism is moved from the lower feed mechanism and scanned by exposed light by one time.
摘要:
An electrographic apparatus comprising a photosensitive screen composed of an insulating layer, two electrically conductive layers coated on opposite sides of the insulating layer and a photosensitive layer coated on one of said electrically conductive layers, and a bias electric source connected between the two electrically conductive layers and producing, on a dielectric coated record sheet, an electrostatic latent image corresponding to an image to be reproduced is disclosed. The apparatus comprises means for adjusting a bias voltage supplied from the bias electric source and applied between the two electrically conductive layers.
摘要:
A cleaning device for an electrophotographic apparatus including a cleaning brush for cleaning unnecessary residual toner particles adhered to an electrostatic latent image retentive member, a cleaning fan for obtaining an air flow to suck the toner particles scraped by the brush and a filter for collecting the sucked toner particles is disclosed. The cleaning device comprises a path of the air flow for sucking the toner particles being made thick at the vicinity of the filter thereby to slow down a speed of the air flow, to easily catch the toner particles by the filter and to drop down the toner particles in front of the filter, and a toner reservoir being provided for collecting the toner particles dropped in front of the filter.
摘要:
A corona discharge device for electrographic apparatus which makes use of a drum-shaped photosensitive screen. The device is provided with a corona electric field establishing electrode extending in parallel with a corona discharge wire and supplied with an electric potential which is intermediate the electric potential of a field electrode and the electric potential of the corona discharge wire.
摘要:
An electrophotographic apparatus for forming or printing any desired number of copies of a document from the same and single electrostatic charge latent image comprisinga photosensitive member such as a photoconductive drum which is rotated at a constant velocity;a corona charger for uniformly charging the photosensitive drum;a document feeding device for advancing the document through an exposure-scanning portion at a constant speed;an optical device for projecting an image of the document at the exposure-scanning portion onto the drum to form an electrostatic charge latent image thereon;a developing device for developing the latent image with toner particles to form a toner image;a transferring device for transferring the toner image onto a record paper;a fixing device for fixing the toner image on the record paper to form a final copy;a clock pulse generator for producing clock pulses in synchronism with the rotation of the photosensitive drum;master and slave timing pulse generators for receiving the clock pulses to produce timing pulses;means for detecting the document at the document feeding means to produce a document detection signal;means for setting the desired copy number to be formed to produce a copy number signal; anda control device for receiving the timing pulses, the document detection signal, and the copy number signal to produce control signals necessary for controlling the operation of the various devices of the apparatus. Duplicating operation for forming a single copy is divided into two portions each of which is assigned to the master and slave timing pulse generators, respectively, whereby during the duplication for the last copy of the desired number of copies under the control of the slave timing pulse generator, a new duplication for a next document can be initiated under the control of the master timing pulse generator which produces timing pulses necessary for duplication during one rotation of the photosensitive drum.
摘要:
A record sheet cutter control device which can cut a record sheet after a normal record sheet feeding operation has completely been stopped. The device comprises means for involving a difference in time between a signal for stopping the operation of a record sheet feed roller and a signal for starting the operation of a cutter.
摘要:
A filter assembly for use in an electrophotographic copying machine to collect used toner which is swept off a member carrying an electrostatic latent image, by means of a rotating brush comprises a filter unit having a toner receiver and a filter holder which are integrally formed together. The filter holder carries a filter element or elements therein, and the toner receiver allows the toner which falls down in front of the filter element to form a pile thereon. The unit is detachably mounted on the copying machine. A labyrinth seal is formed between the unit and the machine when the unit is mounted in place.