Abstract: An image forming apparatus according to the present invention contains an original set tray on which originals are set, image reading system for reading an image on the original, image forming system for forming an image on a sheet on the basis of the image on the original read by the image reading system, an original discharge tray onto which the originals from which the images have been respectively read are discharged, an automatic document feeder for leading the originals set on the original set tray to the position of the image reading system one original at a time, and then discharging the original onto the original discharge tray, a plurality of sheet discharge trays onto which the sheets respectively having the images formed thereon are discharged, distributing system for distributing the sheets respectively having the images formed thereon among the plurality of sheet discharge trays, and a stapler relatively movable in the positions of the original discharge tray and the plurality of sheet discharge

Abstract: Grid wires arranged in an axial direction of a photoconductive drum have a positional relation with projecting electrodes arranged at regular intervals in an axial direction of the photoconductive drum at a position opposite to the surface of the photoconductive drum wherein the grid wires and the projecting electrodes positioned adjacent to each other are equally arranged in distance to uniformly discharge an electric charge to the surface of the photoconductive drum from each of the projecting electrodes so that uniform charging can be accomplished in an axial direction of the photoconductive drum.

Abstract: A copying machine capable of color copying includes a filter apparatus for color-separating scanning light for scanning original images, and the original images are copied by electrophotographic process. The filter apparatus includes mirror filters having color separation filters of blue, green and red, respectively deposited on mirror surfaces and a half mirror, and these mirrors are arranged apart from each other at an angle of 90.degree., so that the apparatus as a whole has a cylindrical shape. The light scanned the original images is reflected by the filter mirrors, and latent electrostatic images corresponding to respective colors are formed on a photoreceptor drum.

Abstract: An image forming apparatus wherein toner images formed on a photosensitive member are transferred to a transfer medium and overlaid thereon, and the toner images on the transfer medium are transferred onto a copy sheet. The apparatus has a charger for reducing charge on the toner images transferred to the transfer medium, and output of the charger is controlled in accordance with the number of toner images on the transfer medium. Alternatively, the image forming apparatus has a first charger for reducing charge on the toner images transferred to the transfer medium and a second charger for recharging the toner images processed by the first charger.

Abstract: An image forming apparatus wherein a toner image formed on a photosensitive member or a toner image once transferred therefrom to a transfer belt is transferred onto a copy sheet by a transfer charger, and the output of the transfer charger is controlled so as to apply a specified amount of charge to the copy sheet for fine image transfer. Specifically, an electric current flowing in the copy sheet is estimated based on an electric current flowing in the transfer belt when no sheets are on the belt, and the output of the transfer charger or alternatively a bias voltage impressed on a roller which supports the transfer belt is controlled so as to cause a specified value of electric current to flow in the transfer belt.

Abstract: A polarity inverting charger is provided at the location between developing position of a photoconductor and transfer position to invert the polarity of a toner image formed on the photoconductor after a first image is transferred onto an intermediate transfer belt from the photoconductor. A transfer charger is actuated with opposite polarity to that of the polarity when the first toner image is transferred onto the intermediate transfer belt to transfer the first toner image on the intermediate transfer belt onto a second surface of a transfer sheet simultaneously when a polarity inverted second image on the photoconductor is transferred onto a first surface of the transfer sheet.

Abstract: An electrostatic latent image developing apparatus has a developing sleeve drivingly rotatable for supplying a magnetic developer to an image bearing surface of an electrostatic latent image bearing member, a casing covering at least a portion of the developing sleeve and extending from a portion where the sleeve is opposed to the electrostatic latent image bearing member to a position where the developer is supplied to the sleeve with respect to the direction of rotation of the developing sleeve, the casing defining a gap with the sleeve, magnets fixedly positioned in the sleeve and having a plurality of poles opposed to the casing, the plurality of poles including first and second poles of same polarity and a third pole of different polarity, the first and second poles being positioned adjacently with no pole therebetween, whereby a first bristle of developer for sealing the gap is formed by the first and second poles and a second bristle of developer for sealing the gap is formed by the third pole.

Abstract: An image forming apparatus including a photosensitive member, a developing sleeve for developing an electrostatic latent image formed on the photosensitive member by using a developer, and control means for controlling the application of bias voltage to the sleeve wherein the bias voltage is controlled so as to be maintained a predetermined time period after the image formation is interrupted.

Abstract: An electrostatic latent image developing apparatus has a magnet housed in a developing sleeve and having at least one magnetized portion including adjacent poles of the same polarity. At least one of the poles of the magnetized portion is opposed to the casing of the developing apparatus, between the position where the developing sleeve is opposed to an electrostatic latent image bearing member and the position where the sleeve is opposed to a developer agitating roller. The other pole adjacent to and having the same polarity as this pole is positioned downstream from the pole with respect to the direction of rotation of the sleeve. Consequently, the upstream pole of the magnetized portion acts to retain a portion of developer between the developing sleeve and the casing, whereby the toner is prevented from spilling over the casing.

Abstract: An automatic image density control apparatus, wherein an original placed on a document table and a reference image pattern provided on one edge of the document table and having a image portion or half-tone portion and a non-image portion are scanned, and by way of an exposure, their electrostatic latent images are formed on a photosensitive member on which the non-developing portion with no developer is also formed, and by means of a density sensor for detecting the image density, the initial image density of the non-developing portion and the image density which varies as the time elapses are detected and by the ratio of them, the image density of the image portion or half-tone portion and the non-image portion of the reference image pattern are corrected, and according to the respective preset reference values of the image portion or half-tone portion and non-image portion and their corrected image density, the image portion or half-tone portion density and the non-image portion density of an image are unif

Abstract: A laminated-type photosensitive member having an aluminum substrate, and a charge generating layer comprised of an organic pigment dispersed in resin, and a charge transporting layer, the aluminum substrate is anodized to form a alumite layer which has a certain thickness, a certain crystalline/amorphous aluminum oxide molar ratio, and a certain impedance; the anodized aluminum layer is sealed; and/or an undercoat layer is formed on the anodized layer. By such arrangement it is possible to obtain a laminated-type photosensitive member excellent in properties of photosensitive members, in particular, good anti-charge injection and retification characteristics.

Abstract: A dry process developing apparatus of a type in which, by supplying toner contained in a toner replenishing tank with respect to magnetic carrier magnetically attracted onto an outer peripheral surface of a developing sleeve, a magnetic developing material composed of the magnetic carrier and toner is prepared on the outer peripheral surface of the developing sleeve for developing an electrostatic latent image supported on the surface of an electrostatic latent image support member by the use of this developing material. The developing apparatus includes a space chamber defined between a bristle height restricting member and a front restricting member so as to open towards the outer peripheral surface of the developing sleeve, and preliminarily loaded with the magnetic carrier, and a toner supplying section for supplying the toner with respect to the outer peripheral surface of the developing sleeve at the upstream side of the front restricting member.

Abstract: A toner replenishment control method for a developing material including two kinds of toners triboelectrically chargeable to polarities opposite to each other, which includes the steps of causing the respective toners contained in the developing material to separately adhere to each of first and second surface areas of a detecting member having predetermined potentials, obtaining first and second detecting signals substantially proportional to amounts of the respective toners which have adhered to the first and second surface areas, the first and second detected signals being set to become equal to each other when a mixing ratio of the respective toners in the developing material is set at a standard mixing ratio, relatively comparing the first and second detected signals, and in the presence of a difference therebetween, replenishing either one of the respective toners to the developing material for eliminating the difference.

Abstract: The disclosure is directed to an improved electrostatic latent image developing method in which uneven development arising from simultaneous employment of a magnetic roller rotational driving system and an AC developing bias impressing system is eliminated, without impairing the advantages available from such systems, so as to make it possible to provide developed images of good quality at high density in the application, for example, to an electrophotographic copying apparatus and the like.

Abstract: An improved reversal development method of visualizing an electrostatic latent image through reversal development, including the steps of: forming a magnetic brush around an outer circumferential surface of a developing sleeve by the use of a developer composed of high-resistivity toner having a resistance value of 10.sup.13 .OMEGA.cm or more under an electric field of 10.sup.4 V/cm and a charge amount of 5 to 15 .mu.Q/g per unit mass generated by gaseous discharge; and applying simultaneously an a.c. bias, and a d.c. bias approximately equal to a sum of a potential of an image portion of the electrostatic latent image and a potential of its non-image portion to the magnetic brush.

Abstract: A waiting time display system specifically for use in a copying machine includes a temperature sensor for monitoring the specific temperature of heat fixing rollers. Electronic processing is responsive to the varying signal outputs of the sensor and correspond to the rise of the temperature detected. A display panel is driven so that a plurality of lights are sequentially activated and deactivated to indicate time and temperature. An audio signal can also be provided to indicate the machine can be activated for copying. An operator can now gauge the amount of time until the copy machine is capable of being operative.

Abstract: A magnetic brush developing apparatus for use in a toner powder image transfer type electrophotographic copying machine which includes an outer cylinder fixedly disposed at a position to confront a photosensitive member or photoreceptor, a magnet roller rotatably accommodated in the outer cylinder for being rotatably driven, a toner tank or hopper containing therein electrically conductive and magnetically attractive toner particles having high resistance and disposed above the outer cylinder for supplying the toner particles onto the outer cylinder, an excessive developing region for developing an image portion of an electrostatic latent image formed on said photosensitive member with sufficient density, and a toner removing region for removing toner particles adhering at least to non-image portion of the electrostatic latent image.

Abstract: Photocopying machine comprising shield elements which are provided between an electrophotosensitive medium and a corona discharge unit at a transfer station, define a slit to permit transfer of conductive toner particles onto copy paper charged by the corona discharge unit but prevent imposition on the paper of a charge liable to cause early transfer of toner particles or of a charge liable to cause cancellation of the charge of the toner particles, and hence detachment, of toner particles on the copy paper.