Abstract: A copying apparatus having a lens position control device capable of setting the copying lens in plural positions for obtaining plural image magnification ratios. The lens position is determined by a control device in response to signals from a lens position detector and pulse signals from a pulse signal generator.

Abstract: An image formation apparatus includes a device for forming an image on a sheet fed thereto, a fixing device for heat-fixing the image, a detector for detecting the temperature of the fixing device, a temperature controller for controlling the electric power supplied to a heat source in accordance with the detected temperature, a detector for detecting disconnection of an element in the temperature detector, and a controller for operating the disconnection detector after a predetermined time from a point of time at which the fixing device starts to be heated.

Abstract: An image forming apparatus has a rotatable member, a plurality of processing devices for forming an image on the rotatable member and transferring the image to transfer material, a device for fixing the transferred image, circuitry for controlling the operation of the rotating member and processing devices so that when the power switch is turned on at least the fixing device is turned on and when the power switch is turned off the fixing device is turned off while the rotation of the rotatable member is continued. The apparatus also includes a signal generating device associated with one of the processing devices, a first detector for detecting transfer material and a second detector for detecting the position of an original carriage, and circuitry for checking for a paper jam by counting signals from the time of the second detector signal.

Abstract: Image forming apparatus is provided with a rotating body, a device to form an image on the rotating body, a device to transfer an image formed by the image forming device onto a transfer member, and a light source to radiate light over the rotating body controller controls the power supply to the light source prior to image formation to thereby control the quantity of light from the light source before commencement of image formation. The rotating body is rotated in such a manner that after power supply control by the controller, no image is formed at a bright and dim light quantity changeover position with respect to the rotating body.

Abstract: An image forming apparatus for forming an image on a photosensitive medium, is provided with an image forming device having reciprocable member for applying image light to the photosensitive medium, a detector for detecting that the reciprocable member is located at a predetermined position in the reciprocating path thereof, signal generator for generating a signal indicating the size of image formation, and a control, responsive to the detector and the signal generator, for selecting the detecting positions of the detector in response to the size signal from the signal generator to control the image forming device at different timings so as to form an image in different timing in accordance with the size thereof.

Abstract: The copying machine includes an image forming unit for forming a reproduced image of an original document on a copying sheet, a data input unit for entering data necessary for image formation, and a timing control for performing timing control of the image forming unit for image formation in response to the entered data. The image forming unit includes a rotary member for forming a transfer image on the copying sheet, and a feeder unit for repeatedly supplying the copy sheets to a transfer station. The input unit has an instruction device for selecting the position of the reproduced image on the copying sheet. The timing control device is provided with a feed control having a switch to be actuated by the image forming unit and a timer associated with the switch, and with a timer control unit for controlling operation of the timer for shifting feed timing of the feed control in response to the instruction data supplied from the instruction device.

Abstract: Copying apparatus including a processing unit for forming a visible image on a copy material, a process control device for operatively controlling the processing unit, and a manual power switch unit for supplying power to electric loads of the processing unit and the process control device. The manual power switch unit includes an actuator to maintain an On condition during the time from the beginning of manual turning on, to the activation of manual turning off, and a coil to release the On condition of the actuator before the activation of the manual turning off. The power switch unit further includes a power control device for driving the coil to release the actuator from the On condition to the Off condition after a predetermined time has elapsed since a completion of copying operations, wherein the power control includes a timer controlled by the process control device for driving the coil.

Abstract: An image forming apparatus includes an image forming unit for forming an image on a recording medium, a command unit for commanding image forming conditions, a first switch for connecting a power source to the apparatus, a first detector for detecting an operational position of the first switch, a second switch for enabling the first switch to connect the power source to the apparatus, a second detector for detecting an operational position of the second switch, and a memory having microprograms stored therein for operatively controlling loads on the image forming unit. The operation of the image forming unit is controlled by signals derived from the first and second detectors and the microprograms.

Abstract: An imaging forming apparatus in which a photosensitive member is electrostatically charged and the charged area is exposed to light to form a latent image which is subsequently developed to obtain an image the apparatus being featured in that the imaging area on the photosensitive member is exposed to the light of an arbitrary amount while the non-imaging area on the photosensitive member is exposed to the light of an amount determined irrespective of the arbitrary amount, and the surface potential of the area exposed to the light of the determined amount is measured thereby controlling the image formation according to the measured output.

Abstract: An image formation apparatus has a reciprocally movable member for scanning an original document, a device for forming an image on the basis of the scanned image by the reciprocally movable member, a driver for driving the reciprocally movable member to move the member in a predetermined direction, and a controller for controlling the driving means to drive the reciprocally movable member in the opposite direction near a predetermined position to stop the member at the predetermined position.

Abstract: An image forming apparatus includes an image forming unit for forming an image on a recording medium, a command unit for commanding image forming conditions, a first switch for connecting a power source to the apparatus, a first detector for detecting an operational position of the first switch, a second switch for enabling the first switch to connect the power source to the apparatus, a second detector for detecting an operational position of the second switch, and a memory having microprograms stored therein for operatively controlling loads on the image forming unit. The operation of the image forming unit is controlled by signals derived from the first and second detectors and the microprograms.

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: In a copying apparatus having an endless photosensitive medium, a number of copy process devices for forming an electrostatic latent image on the photosensitive medium, for developing the latent image, for transferring the developed image and for cleaning the photosensitive medium, there is provided circuitry for controlling the operation of at least one of the copy process devices in accordance with the generation of a predetermined number of clock signals. The control circuitry acts to start the initiation of the copy process after counting a predetermined number of signals and to stop the rotation of the medium at a different rotational position from the start position. The apparatus also includes a jam detecting device and reciprocating member for the formation of the latent image, the position of which is detected for utilization in the control circuitry.

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 copying machine capable of copying either bulky originals or sheet originals. The machine includes a bulky original holder and sheet original feeder having a sheet original exposure section arranged at a position sufficiently spaced apart from the bulky original holder so that it does not interfere with the operation of the bulky original holder. A bulky original scanning device includes at least two movable mirrors, one of which is moved out of the optical path to form an optical path for scanning the sheet original.

Abstract: In a feed cassette device which comprises a cassette corresponding in size to copy mediums to be contained therein, and a cassette table suited to receive the cassette thereon, the cassette has a positioning guide member and the cassette table has a cassette positioning portion and a member for urging the cassette toward the positioning portion. The feed cassette device also has means for locking the cassette in a predetermined position when it is loaded on the cassette table.

Abstract: A device for detecting a body comprises transmitter means, receiver means for receiving the signal from the transmitter means, means for setting the level of a reference signal by the reception signal from the receiver means provided when the body is in a reference condition, to correct the reference signal, which reference signal provides a reference for identifying the reception signal, and comparator means for identifying the reception signal in accordance with the reference level connected to the reference level setting means. The body detecting device effects the detection by the output of the comparator means.

Abstract: There is disclosed a method of maintaining at a desired level the temperature of components in a copying machine which is in its idle state. An electric power is supplied members in the machine having an impedance component after the copying operation has been stopped. The voltage of the power must be set at a value lower than the rated voltage of the members.