Abstract: An image forming machine includes a host computer, a printer, a copying machine, and a document supply device for conveying a document printed by the printer to an automatic document feeder of the copying machine. The host computer and a control device provided in the printer are connected together via a parallel data transfer type interface, while the host computer and control device provided in the copying machine are connected together via a serial data transfer type interface. Thus independent data are transferred from the host computer to the control device of the printer and the control device of the copying machine.

Abstract: A toner cartridge including a container having a toner discharge port, a toner contained in the container and a stirrer for stirring the toner existing in the container. The stirrer includes a rotary shaft rotatably mounted between both side walls of the container, not less than two arms extending in the radial direction, from the rotary shaft at fixed intervals in the axial direction and not less than one paddle disposed between the ends of the arms. Each paddle has a plate piece made of a synthetic resin film extending in a direction to separate away from the rotary shaft. The plate piece has one or more holes formed therein.

Abstract: The present invention provides a novel naphthylenediamine derivative which is superior in electric charge transferring capability, compatibility with binding resin and stability, and an electrophotosensitive material which has a higher sensitivity and an excellent durability. The above naphthylenediamine derivative is represented by the following general formula (1), and the electrophotosensitive material is formed by providing a photosensitive layer having this naphthylenediamine derivative as an electric charge transferring material on a conductive substrate. ##STR1## wherein R.sup.1 to R.sup.4, R.sup.5a to R.sup.5f and a to d are as defined.

Abstract: An image forming machine including a single layer dispersion type photoconductor drum, a charging device for charging the surface of the photoconductor drum to a specific polarity, and a developing roller for conveying a developer to the surface of the photoconductor drum having a latent electrostatic image formed thereon. The photoconductor drum and the developing roller are adapted to contact each other at their surfaces and to be rotationally driven in reverse directions. The photoconductor drum has a diameter set at 10 to 20 mm, while the developing roller has a diameter set at 90 to 110% of the diameter of the photoconductor drum.

Abstract: An automatic document feeder 1 automatically operates a tray depending on the operating conditions of the automatic document feeder. The automatic document feeder 1 has a set surface 7 on which originals to be conveyed are to be set. An original receiving tray 11 for receiving discharged originals is provided in the vicinity of an original discharge port 10. A lower end of the original receiving tray 11 is rotatable, and a tray driving device is connected to the back of the original receiving tray 11. The tray driving device rotates and displaces the original receiving tray 11 around the lower end depending on the operating conditions of the automatic document feeder 1. The original receiving tray 11 is raised almost perpendicularly until the originals are set on the set surface 7 (see FIGS. 4A and 4D). When the originals are conveyed, the original receiving tray 11 is rotated to an obliquely laid state (see FIGS. 4B and 4C) in order to receive the paper sheets discharged from the discharge port 10.

Abstract: A transferring device in which a transfer roller having a diameter which is not less than 60% of the diameter of an organic photosensitive drum with a diameter of 10 to 20 mm is arranged with a clearance provided between the transfer roller and the organic photosensitive drum. The transferring device avoids problems such as current leakage and reverse transfer of toner in the case of miniaturization of an image forming apparatus or contamination of the transfer roller, and easily sets a transfer current because an effective transfer current width is large.

Abstract: An image forming apparatus that includes an image reading section, a transportation path, a photoreceptor, transferring area, a fixing area, and a feeding speed controller. The feeding speed controller selects the speed at which an original document passes through the image reading section between two speeds. A first speed is used when the transfer sheet is normal sized and for a period of time prior to a large sized sheet entering the fixing area. Once a large sized sheet enters the fixing area, the feeding speed controller changes the speed of the original document from the first speed to the second speed to provide proper scaling of the reproduced image on the transferred sheet. The second speed may be adjusted depending on the type of transfer sheet being used to take into account the amount of stretching of the material used to make the transfer sheet.

Abstract: An image-forming machine including a photosensitive drum which is rotatably disposed and successively passes through a charging zone, a developing zone and a transfer zone; a charger for charging the peripheral surface of the photosensitive drum into a predetermined polarity; a developing device for developing an electrostatic latent image formed on the peripheral surface of the photosensitive drum into a toner image; a transfer means for transferring the toner image formed on the peripheral surface of the photosensitive drum onto a transfer paper; and a foreign matter-recovering means which is disposed between the transfer zone and the charging zone and comes into contact with the peripheral surface of the photosensitive drum, and removes foreign matter adhered onto the peripheral surface of the photosensitive drum, the foreign matter-recovering means having a foreign matter-recovering brush brought into contact with the peripheral surface of the photosensitive drum, an elastic holding member made of an elas

Abstract: A paper holder mounting mechanism for mounting a paper holder in an apparatus, the paper holder mounting mechanism includes a vertically-acting paper holder locking mechanism that is put to an interlocked state when the paper holder is inserted into the apparatus; a sliding guide device; and two joints disposed along the inserting direction of the paper holder for connecting the sliding guide device to one of side walls of the paper holder. The joints are set such that a rear portion of the paper holder is swingable up and down about the joint at the front to effect an interlocking action of the paper holder locking mechanism.

Abstract: A document feeder having a main document setting plate for holding thereon a stack of document originals to be processed, an auxiliary document setting plate for holding thereon a stack of document originals to be processed after the processing of the document originals set on the main document setting plate, a transfer mechanism for transferring the document originals set on the auxiliary document setting plate to the main document setting plate, and a feeding mechanism for feeding the document originals set on the main document setting plate one by one to a processing position. The document originals are transferred from the auxiliary document setting plate to the main document setting plate in synchronization with the one-by-one document feeding from the main document setting plate to the processing position by the feeding mechanism.

Abstract: A photosensitive material for electrophotography, wherein the charge-generating agent comprises a P-type charge-generating pigment and an N-type charge-generating pigment in combination, at least part of these pigments being present in the form of aggregates in the photosensitive layer. The photosensitive material will assume the form of either a single dispersion type or a laminated layer type, and exhibits very high carrier generation efficiency, strikingly improved sensitivity on the side of long wavelengths, excellent balance in the spectral sensitivity and property after repetitively used, and can hence be effectively used for forming image by the electrophotography.

Abstract: A toner replenishing device of an image forming machine, including a toner cartridge receiving member disposed in a machine body and having a cartridge inserting position and a cartridge mounting position; and a toner cartridge having a container body with a toner discharge opening and mounted detachably on the toner cartridge receiving member; wherein a reference alignment mark is provided at a machine body wall portion positioned above the toner cartridge receiving member, a first alignment mark is provided on the container body of the toner cartridge at a position opposite the reference alignment mark at the cartridge inserting position, and a second alignment mark is provided on the container body of the toner cartridge at a position opposite the reference alignment mark at the cartridge mounting position. The cartridge is movable to the cartridge mounting position at right angles to the direction of insertion of the cartridge by using an operating lever.

Abstract: The present invention provides a novel tryptanthrine derivative represented by a general formula: ##STR1## wherein R.sup.1 is an oxygen atom, or group represented by a formula: ##STR2## wherein R.sup.2A and R.sup.2B are the same or different and indicate a hydrogen atom, a cyano group, an acyl group, an alkoxycarbonyl group or an alkyl group, provided that R.sup.2A and R.sup.2B are not hydrogen atoms simultaneously; andR.sup.3A, R.sup.3B, R.sup.3C, R.sup.3D, R.sup.4A, R.sup.4B, R.sup.4C and R.sup.4D are the same or different and indicate a hydrogen atom or an alkyl group which may have a substituent, provided that when R.sup.1 is an oxygen atom, any one of R.sup.3A through R.sup.4D is a cyano group.Such a tryptanthrine derivative has an excellent electron transport capability to be suitably used for the electrophotosensitive material.

Abstract: Image data generated by a reading section to perform copying is outputted to a recording section and, when a facsimile communication is received during such copying, received image data is temporarily stored in an image memory. Meanwhile, an amount of the received image data stored in the image memory is monitored so that, when free capacity of the image memory becomes less than a permitted level, copying is interrupted and operation for copying is switched to operation for outputting the received image data in the image memory through the recording section. Thus, a certain amount of capacity is always available in the image memory and vicarious reception errors due to a memory overflow during copying is eliminated. When the received image data in the image memory has been printed out by the recording section to such an extent that the free capacity in the image memory becomes sufficient again, the interrupted copying is restarted. Thus, copying can be performed without unnecessary delay.

Abstract: A conveyer device includes a container containing a toner therein and having a bottom wall and two side walls, a toner discharge port formed in the bottom wall, and a conveyance mechanism for conveying the toner in the container toward the discharge port. The conveyance mechanism includes a rotary shaft that is supported across both side walls to rotate and is positioned to pass above the discharge port, and a pair of spiral vanes formed on the rotary shaft. The vanes have their spiral directions opposite to each other. The discharge port has a first side edge and a second side edge opposed to each other at a distance in the axial direction of the rotary shaft. One of the spiral vanes extends from the first side edge toward the second side edge of the discharge port, above the toner discharge port. The other spiral vane extends from the second side edge toward the first side edge of the discharge port.