Abstract: An electrophotographic apparatus of the retention type is provided with a record paper detection assembly which generates a paper shortage signal when the number of record papers stored in a paper cassette is decreased to a predetermined small number substantially equal to the number of copies which can be formed from a single latent image. When the paper shortage signal is produced during a retention copy for a document, the copying operation is completed for the current document, but further copying operation for a next document is inhibited. After the copying operation for the current document has been finished, an indication lamp is lighted to indicate that the remaining number of record papers in the cassette has been reduced to the predetermined number. Further, the copying operation for the next document which has been set on a document table can be initiated automatically after the paper cassette with a sufficient number of papers stored therein has been attached to the apparatus.

Abstract: In a collator for use in combination with an electrophotographic copying machine which discharges copies of originals in succession at the same time interval, deflection claws for delivering successive copies of a manuscript into successive bins are provided at inlets of respective bins and two endless belts each having an actuator for driving the deflection claws are provided movably along the successive bins. The two endless belts are driven by two different controlling circuits, respectively in an independent manner. During the copy delivering operation by the first endless belt for a plurality of copies of a certain document, it is possible to initiate the copy delivering operation by the second endless belt for a plurality of copies of the next document.

Abstract: A collator includes a series of twenty bins arranged in parallel with each other. A copy feeding member feeds copies supplied from a copying machine along inlets of the successive bins. First and second deflecting devices are arranged at uppermost two bins for delivering the copies into the uppermost two bins. A distributor is movable between the third bin and the twentieth bin for delivering the copies into the bins. An extra tray is provided separately from the bins. The collator further comprises a collate mode selecting member, a job separation mode selecting member and a non-collate mode selecting member.

Abstract: A duplicating system comprises an electrophotographic copier which includes a first document detecting switch, 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 apparatus for forming a duplicated copy with the aid of the latent image. An option device is detachably mounted onto the copying apparatus and comprises a second document detecting switch, 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 the second document onto the photosensitive drum.

Abstract: A collator includes a series of twenty bins arranged in parallel with each other, a copy feeding member for feeding copies supplied from a copying machine along inlets of the successive bins, first and second deflecting devices arranged at the uppermost two bins for delivering the copies into the uppermost two bins and a distributor movable between the third bin and the twentieth bin for delivering the copies into the bins. The collator can treat the copies in a job separation mode in which all copies of each documents are delivered into respective bins in succession, while the distributor is advanced bin by bin in response to a distributor advance signal produced by a variable timer which is actuated upon detection of the rear edge of the last copy of an Nth original by an entrance switch to set a time period represented by b+(N-1).times.a/V.sub.1, wherein a is a pitch between successive bins, b is a distance from the entrance switch to the first bin and V.sub.1 is a copy feed speed in the collator.

Abstract: 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.

Abstract: 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.

Abstract: A conveyor unit for a book carrier includes a book carrier on which an original having substantial thickness such as a book is placed, and conveys it to an exposure station in order to form an electrostatic latent image of the original in a copying machine. A driven member in the form of a rack is formed on the book carrier, and is driven by a drive member in the form of a pinion which is provided on the part of the copying machine. Elements are provided to maintain such drive relationship. In this manner, a book carrier is positively and reliably conveyed.

Abstract: An electrophotographic apparatus for printing or forming at least one copy of a manuscript comprising a manuscript feed mechanism including upper and lower side feed mechanisms arranged above and below a rectilinear manuscript feed path including a slit light exposure portion at which a manuscript image is projected onto a photosensitive drum, said upper side feed mechanism being movable with respect to said slit light exposure portion to define thin and thick manuscript feed paths, respectively. A thick manuscript feed mechanism is provided in the lower side feed mechanism for feeding a thick manuscript carriage made of transparent plate. The apparatus further comprises a first movable edge guide for positioning an edge of a sheet manuscript and a second fixedly arranged guide for positioning the edge of the thick manuscript carriage. The first guide is preferably positioned inwardly with respect to the second guide viewed in a widthwise direction of the manuscript.

Abstract: A duplicating system comprises an electrophotographic copier 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, apparatus for forming a duplicated copy with the aid of the latent image and a sequence control circuit for controlling a duplicating operation in such a manner that the image of first document is projected onto the photosensitive drum from an imaginary control start position.

Abstract: 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.

Abstract: An electrophotographic apparatus which makes use of a circuit arrangement connected and arranged such that unless a manuscript to be copied passes through a manuscript detector, a gate circuit functions to prevent a copy starting pulse from passing therethrough, thereby preventing initiation of a new copying operation.

Abstract: 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 mo

Abstract: 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.

Abstract: 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.

Abstract: In the electrophotographic apparatus for printing one or more copies of a document, a photoconductive drum rotates at a constant velocity while being charged; a document feeding device advances a document through a light exposure portion at a constant speed and, an optical device projects an image of the exposed document onto the drum to form an electrostatic charge latent image thereon. A latent image is developed to form a toner image after which the toner image is transferred onto a record paper and the toner image is fixed on the record paper to form a final copy. Clock pulses in synchronism with the rotation of the photosensitive drum are produced, whereby master and slave timing pulse generators receive the clock pulses to produce timing pulses. Then a control device receives the timing pulses and produces control signals necessary to control the operation of the apparatus.

Abstract: An electrographic apparatus which can obtain any desired number of copies of a manuscript by scanning it only one time by exposed light and which comprises a manuscript feed mechanism including upper and lower side feed mechanisms arranged above and below a manuscript feed path defined by a slit light exposure portion which projects a manuscript image therethrough, said upper side feed mechanism being movable with respect to said slit light exposure portion to define thin and thick manuscript feed paths, respectively.

Abstract: 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.

Abstract: An electrophotographic apparatus which includes a rotating photosensitive drum on which an electrostatic charge latent image is formed; a developing device for developing the latent image with toners to form a toner image on the drum; a transfer roller for transferring the toner image onto a record paper and arranged movably with respect to the drum; and a record paper detector for detecting a paper jamming to produce a paper jam signal. The rotation of the drum is stopped and the transfer roller is moved away from the photosensitive drum in response to the paper jam signal so as to make it easy to remove the jammed paper, and the transfer roller is moved into an initial operative position after the ddrum has rotated by such an angle that residual toners and electrostatic charge on the drum pass through the transfer roller.

Abstract: The electrophotographic apparatus for forming one or more copies of a document has a photosensitive drum rotatably arranged for forming an electrostatic charge latent image and a developing device for developing the latent image into a toner image. A transfer roller is rotatably arranged for transferring the toner image onto a record paper which is supplied between the drum and transfer roller. A pair of arms are provided each of which rotatably support a respective end of a shaft of the transfer roller through a bearing and which is slidably inserted in a recess formed in respective arms in a radial direction of the drum. Furthermore, a pair of coiled springs are each respectively provided on the respective arms and surround the bearings in such a manner that the transfer roller is forced resiliently to displace toward the drum.