Abstract: A copying apparatus has a device for transporting copy material along a path, a device for detecting copy material along the path, first and second modes in which first and second timing signals are produced, respectively, and a jam detector, responsive to the absence of a detection by the detection device prior to the first or second timing signal, for producing an output.

Abstract: In a copying device for forming a latent image on a rotatable image bearing member, such member has a portion which is not used for image formation. The latent image is developed into a toner image on the rotatable member, and a cleaning device is provided for cleaning the rotatable member to permit its reuse. An improvement is provided wherein a device detects the rotational disposition of the image bearing member, and positions the portion of such member which is not used for image formation in alignment with the cleaning device when the rotatable member is stopped.

Abstract: A copying apparatus has an original document base which reciprocates along a scanning path for slit exposure of an original. The image of the original is formed on a photosensitive drum and is then transferred onto a copy sheet. Copy sheets are fed in response to a switch which is provided along the scanning path and is actuated by movement of the original document base in the scanning direction. Another switch is provided to prevent feeding of a copy sheet during movement of the base in the opposite direction.

Abstract: An electrophotographic apparatus capable of copying an original selectively at different magnifications includes a movable electrophotographic photosensitive member, an electrostatic discharge device for imparting discharge to the photosensitive member to render it into a potential condition capable of forming an electrostatic latent image, a scanning mechanism for scanning the original, an optical system for forming an optical image of the scanned original on the photosensitive member at a selected magnification to form an electrostatic latent image, a device for changing the velocity of movement of the photosensitive member in correspondence with the selected magnification, and control circuit for varying the quantity of discharge per unit time of the discharge member to the photosensitive member in correspondence with the selected magnification.

Abstract: In a copying apparatus having an original-supporting surface capable of supporting thereon a thick original and a sheet-original exposure and transport portion, the original-supporting surface and the exposure surface of the sheet-original exposure and transport portion are formed separately and independently of each other or formed integrally with each other. The apparatus further includes an optical system for directing the image of an original to a photosensitive medium, and various copying process means. When an original on the original-supporting surface is to be copied, the optical system scans the original while moving along the original-supporting surface. When a sheet original is to be copied, the optical system is fixed to correspond to the exposure surface spaced apart from the original-supporting surface and the sheet original is passed through the sheet-original transport portion for scanning.

Abstract: A copying apparatus has a rotatable medium, processing apparatus including a charger for forming an image of an original on the rotatable medium and for transferring the image to a transfer material, a residual charge remover, a copy setting mechanism and a start switch. The rotatable medium is rotated during the copying operation with both the charger and residual charge remover operating and is post rotated after the copying operation with the charger disabled but the residual charge remover operating. When the start switch is operated during the post-rotation but before the charger becomes disabled, the charger remains operative and copying is restarted.

Abstract: An image forming device has a photosensitive member upon which a latent image is formed and then developed into a visible image and device for heating said photosensitive member.

Abstract: In a copying device for selectively copying sheet originals and thicker originals, the thicker originals being copied while positioned on a reciprocating original carriage. In one mode of copying thick originals, the original carriage is reciprocated one time for each rotation of the photosensitive drum while in another mode each reciprocation corresponds to two rotations of the drum. In one mode of copying sheet originals the photosensitive drum rotates once for each copy while in another mode a plurality of copies are formed for each rotation. The copying device has a control system for detecting the position of the reciprocating carriage and for controlling the forward and reverse movement of the carriage as a function of the size of the original being copied as well as the position of the carriage.

Abstract: A copying machine capable of making a copy of a selected area of a document, which is provided with a mechanism for setting the base line for copying a document placed on the original table as desired and for aligning the edge of copying material with the selected base line. The base line for copying is selectively determined by moving an indicator and when the moving optical system of the copying machine reaches the selected base line, an imagewise exposure is started. In timing with the exposure, feeding of copying material is also started. The lens of the optical system is moved by a distance determined by the distance which the indicator has moved to select the base line and the edge of the copying material is brought in alignment with the base line. To prevent the unnecessary area of the document from being copied, the area of photosensitive medium corresponding to the unnecessary area is exclusively exposed to light so as to erase the electrostatic latent image on this area.

Abstract: A copying machine including a first sheet original illuminating and conveying device for moving sheet originals and exposing the same to light, a second sheet original illuminating and conveying device for moving sheet originals disposed at a position which does not interfere with the first sheet original illuminating and conveying device and exposing the same to light, a device for controlling a sheet original so that one surface of the sheet original is exposed to light by the first sheet original illuminating and conveying device and so that the other surface of the sheet original is exposed to light by the second sheet original illuminating and conveying device, a main optical device for forming a first and a second optical path so as to enable one of the images of the sheet original conveyed by the first or the second sheet original illuminating and conveying device to be selectively exposed at an exposure position near a photosensitive medium, and a first movable mirror change-over device for selecting

Abstract: There is disclosed an electrophotographic method and device for forming copies utilizing a reciprocating member movable for scanning an original document positioned thereon to form a latent image on a rotatable photosensitive medium. Transfer material is fed in response to a feed signal produced by the reciprocating member in accordance with movement thereof. In one mode of operation, the photosensitive medium completes at least two rotations for each reciprocation of the reciprocating member.

Abstract: A control device for driver member comprises an intermittently movable driver member, a follower member adapted to follow the driver member for displacement, retention and return displacement, a control member for controlling the starting and stoppage of the movement of the driver member, and a first and a second signal for starting the movement of the driver member. The movement of the driver member may be started by the first signal to displace the follower member to bring about the retaining position, whereafter the movement of the driver member may be automatically stopped by the control member, and the movement of the driver member may be restarted by the second signal and at the position whereat the return displacement of the follower member is completed, the movement of the driver member may be automatically stopped by the control member.

Abstract: An image forming device having a rotatable medium, a latent image forming device for forming a latent image on the rotatable medium, apparatus for applying liquid developer to the latent image to form a toner image, apparatus to transfer the toner image to transfer material and a cleaning apparatus for cleaning the rotatable medium after transfer. The device is operated so that there is an initial application of developer to the cleaning apparatus to loosen any dried toner after which the rotatable medium undergoes a prerotation of at least one half of a complete rotation before image formation is begun. After termination of an image forming operation, the rotatable medium is rotated for a predetermined time to clean its surface and then stopped.

Abstract: A method and apparatus for producing electrophotographic copies, wherein a rotatable photosensitive medium is rotated and pre-cleaned prior to image formation on the cleaned portion and wherein the entire medium is cleaned upon the completion of image formation.

Abstract: A sheet sorting device for use with a copying machine, a simple printing machine, etc., which comprises a tray housing having a plurality of oscillatable trays, support means for the tray housing, moving means for displacing the support means so as to cause each of the trays in the tray housing to be positioned at a sheet introducing position, and control the moving means, the tray housing being progressively displaced to position the trays successively at the sheet introducing position so that the sheets may be introduced into predetermined ones of the trays.

Abstract: In an electrophotographic copying apparatus of the liquid development and transfer type, a liquid developing device includes a photosensitive drum, an arcuate developing electrode disposed below the photosensitive drum in opposed relationship therewith, and spacers disposed at the opposite ends of the developing electrode to maintain a predetermined clearance between the developing electrode and the photosensitive drum. Developing liquid may be supplied into the clearance to develop an electrostatic latent image on the photosensitive drum.

Abstract: A feeding device comprises a plurality of cassettes capable of supporting thereon copy mediums, a cassette cradle for holding the cassettes in an operatively associated relationship with one another, feed means for feeding the copy mediums, control means for controlling the feed means to intermittently feed the copy mediums, and means for selectively displacing the cassette cradle to at least two positions to selectively locate at least one of the cassettes at a position where it may be acted on by the feed means, whereby copy mediums may be fed from one of the cassettes.

Abstract: A copying machine capable of copying originals on the front and back faces of each copy medium comprises a photosensitive medium, a charger for electrostatically charging the photosensitive medium, an optical system for projecting an original image upon the photosensitive medium to form an electrostatic latent image thereof, a developing device for developing the latent image into a transferrable image, a transfer device for transferring the transferrable image onto copy mediums, a first feeder for feeding copy mediums for the front-face copying, a reversing mechanism for reversing the copy mediums fed by the first feeder after the image transfer, and a second feeder for temporally stopping the copy mediums, after reversal, on their way to the transfer device and for feeding the reversed copy mediums to the transfer device for back-face copying.

Abstract: A counting device including a click wheel operative integrally with a dial for setting the number of repetitive operations, the click wheel having teeth therearound, the number of which corresponds to the number of the repetitive operations; a ratchet wheel having a projection, the ratchet wheel being rotated to a starting position thereof by rotation of the click wheel; a feeding pawl for feeding the ratchet wheel in response to an external signal for every operation; a preventing structure for preventing the ratchet wheel from returning by pressure contact or engagement; and a start button integrally formed with a center shaft and a rotation preventing member of the center shaft, the start button being locked by the preventing structure for said ratchet wheel, and the rotation preventing member being engageable with the preventing structure; the engagement between the rotation preventing member and the preventing structure changing to open a switch as soon as the projection of the ratchet wheel releases the

Abstract: A copying apparatus comprises an original supporting table having a transparent plate for supporting thereon an image original to be copied, scanning mirror means having a first and a second movable mirror for scanning the image original on the original supporting table without varying the length of the light path thereof to project the image original, a plurality of stationary mirror means stationary during copying operation, lens means disposed in a first light path formed by the mirror means for focusing the image of the original onto a photosensitive medium, and means for newly forming a second light path at a position out of the way of the scanning mirror means by displacing the lens means or by varying the angle of reflection of one of the stationary mirror means.