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 includes a recording member, image forming devices for forming an image on the recording member, a detector for detecting the state of the apparatus and a digital control having a stored main program for actuating the elements for image formation, wherein the digital controller includes a stored program to be executed upon interruption of the execution of the stored main program and an input port for causing execution of the interruption program, and the detecting means being connected to the input port to cause, in response to the detection signals, the execution of the interrupt program in response to the detected state.
Abstract:
An image forming apparatus capable of interrupting a copying operation for a priority copying operation includes a first key for entering a desired number of copies, a second key for causing the start of a copying operation, a third key for interrupting a first copying operation initiated in accordance with operation of the first and second keys in order to enable a second or priority copying operation, a fourth key for stopping the first copying operation and control circuitry responsive to the various key operations. Operation of the third key to interrupt a copying operation causes a memory to store the number of repetitions needed to complete the first copying operation. The memory also stores the number of copies for the second copying operation upon operation of the first key after operation of the third key prior to the start of the first copying operation. Operation of the second key after completion of the second copying operation completes or commences the first copying operation. When the fourth key is operated during the priority copying operation, the first copying operation is resumed. The copying operation in progress when a malfunction occurs is resumed after the malfunction is corrected.
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:
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:
The image forming method is executed by projecting a light image on a rotatable recording member to consecutively form electrostatic latent images corresponding to the light image, developing the latent images, projecting a predetermined amount of light onto a non-imaged area present between two consecutive latent images on the recording member to form an electrostatic image, detecting potential of the electrostatic image, and controlling the development of the latent images next to the electrostatic image detected during the detection of the potential in response to the detection results. This method is performed in the image forming apparatus which includes a rotatable recording member, processing units for projecting a light image onto the recording member to consecutively form electrostatic latent images corresponding to the light image, a developer unit for developing the latent images, a voltage applying circuit for applying a voltage to the developer unit, a projecting unit for projecting a predetermined amount of light onto a non-imaged area present between two consecutive latent images on the recording member, a detector for detecting surface potential of the non-imaged area, and a controller for controlling the voltage applying circuit in response to detection output from the detector in the development of the latent image next to the non-imaged area in the developer unit.
Abstract:
An image forming apparatus includes a detector for measuring the surface potential of a photosensitive member on which an electrostatic latent image is formed and a controller which regulates image formation plural times in accordance with the measured surface potential based on the length of time between image formations. In another aspect, the image forming apparatus includes a light source and a setting device for manually setting the quantity of light therefrom between a maximum and minimum value. A test sample of a predetermined optical density is arranged to be illuminated by the light source so as to produce a test light for projection onto a recording medium. A detector detects an electrical surface condition of the test-lighted recording medium. In response to the detected electrical surface conditions, and a controller regulates the image formation in accordance with the detector. The light from the light source is adjusted so that illumination of the test sample assumes a standard value intermediate the maximum and minimum values, and so that illumination of an original assumes the value set by the setting device.
Abstract:
An image formation apparatus has a first feeder for feeding a copy sheet from a container containing a number of copy sheets therein, a second feeder for feeding a copy sheet supplied manually thereto. Both feeders feed the copy sheet to an image formation station, and a scanner exposure-scans an original image to form a copy image, a first detector detects the size of manually supplied copy sheets and a second detector detects the size of the copy sheets in the container, a controller controls the movement of the scanner in accordance with detection by the first and second detectors, so that the scanning stroke length of the scanner is coordinated for the size of the copy sheet manually supplied to the image formation station and supplied from the container.
Abstract:
A surface potentiometer having a movable shield member for intermittently shielding a clearance between a measurement electrode and a surface to be measured to cause a potential of the surface to be measured to be induced as an AC signal in the measurement electrode. A voltage greater than or equal to a maximum value of the potential of the surface to be measured or a voltage smaller than or equal to a minimum value of the surface potential is applied as a bias voltage to the shield member to thereby permit discrimination between positive and negative polarities of the surface potential. A rectifier is provided for rectifying the voltage induced in the electrode, and an operational device substracts the bias voltage from the rectified voltage.
Abstract:
An image formation apparatus has a first feeder for feeding a copy sheet from a container containing a number of copy sheets therein, and a second feeder for feeding a copy sheet supplied manually thereto. Both feeders feed the copy sheet to an image formation station, and a scanner exposure-scans an original image to form a copy image. A first detector detects the size of manually supplied copy sheets, and a second detector detects the size of the copy sheets in the container. A controller controls the movement of the scanner in accordance with detection by the first and second detectors, so that the scanning stroke length of the scanner is station coordinated for the size of the copy sheet manually supplied to the image formation and supplied from the container.