Abstract: A memory is provided in an electrophotographic process cartridge to be mounted on a printer, and an area in the memory is separated into a read-only area and a rewritable area. In this structure, a data error in the memory is checked. If an error in the read-only area is detected, an alarm is displayed and a print operation is prohibited. On the other hand, if an error in the rewritable area is detected, the alarm is displayed and the print operation is permitted.

Abstract: An image forming apparatus includes a scan unit for scanning a light beam modulated based on an image signal in the main scan direction, and a drive unit for rotating an image carrier in the subscan direction of an image. The rotation period of the image carrier is set to be an integer multiple of the scan period in the main scan direction of the light beam by the scan unit.

Abstract: In a multicolor image forming apparatus constructed of a printer controller and a printer engine, such as a laser beam printer, and the like, after confirming the reception of a proper ID command from the printer controller, the printer engine enters a printable state. Before the ID of the printer controller is checked, by checking an attachment situation of the printer controller at the time of turning on of a power supply, and the like, the attachment situation of the printer controller is discriminated. When the printer engine is not attached, the ID check is skipped and only an engine test print by an engine test print switch is enabled.

Abstract: In a printer having a toner cartridge drum in which a toner cartridge of each of yellow, magenta, cyan, and black is detachably provided, when the toner cartridge is exchanged by opening a door of the printer and, further, opening a cartridge door, in case of opening and subsequently closing the toner cartridge door, a cartridge change mode is set, and in case of closing the door of the printer, an initial operation of the printer is not immediately performed but the cartridge drum is driven and the cartridge to be exchanged is moved to a taking-out position. When the cartridge change mode is not set, in case of closing the door of the printer, the initial operation of the printer is executed.

Abstract: An image processing apparatus includes a first delay generation circuit, requiring no high-frequency clocks, for obtaining a pixel formation start timing signal from a digital input signal, a second delay generation circuit, requiring no high-frequency clocks, for obtaining a pixel formation end timing signal from the digital input signal, and a unit for obtaining a pixel formation interval signal from the pixel formation start and end timing signals.

Abstract: An image forming apparatus forms a patch image on a recording medium, irradiates the patch image formed on the recording medium with light, and detects a quantity of light reflected by the patch image and outputs a first detection signal. The apparatus detects a quantity of light emitted by a light emission source and outputs a second detection signal, and amplifies the first detection signal in accordance with a first amplification gain and outputs a first amplified signal. The apparatus amplifies the second detection signal in accordance with a second amplification gain and outputs a second amplified signal, and controls image forming conditions based on the first amplified signal or the second amplified signal. An adjustment mode is executed prior to controlling the image forming conditions, and the first amplification gain is controlled when the patch image is formed with black toner, and the second amplification gain is controlled when the patch image is formed with color toner.

Abstract: An image forming apparatus includes a scan unit for scanning a light beam modulated based on an image signal in the main scan direction, and a drive unit for rotating an image carrier in the subscan direction of an image. The rotation period of the image carrier is set to be an integer multiple of the scan period in the main scan direction of the light beam by the scan unit.

Abstract: This disclosure relates to an image forming and processing apparatus having a plurality of storage device capable of forming an image at a high speed by reading image data in parallel. Since a predetermined quantity of image data is stored in a plurality of hard discs, and the image data is read from the hard discs to a double buffer in parallel, an image can be formed continuously at a high speed. Another structure is arranged in a manner such that images are stored in hard discs of an optional number and the images are transmitted to a printer engine by using a FIFO (First In First Out) buffer which corresponds to the hard discs. Therefore, an image can be transmitted continuously at a high speed asynchronously with the printer output.

Abstract: This disclosure relates to an image forming and processing apparatus having a plurality of storage devices capable of forming an image at a high speed by reading image data in parallel. Since a predetermined quantity of image data is stored in a plurality of hard discs, and the image data is read from the hard discs to a double buffer in parallel, an image can be formed continuously at a high speed. Another structure is arranged in a manner such that images are stored in hard discs of an optional number and the images are transmitted to a printer engine by using a FIFO (First In First Out) buffer which corresponds to the hard discs. Therefore, an image can be transmitted continuously at a high speed asynchronously with the printer output.

Abstract: An image forming apparatus for forming an image on a recording medium has an image forming device for forming an image on the recording medium, a conveyance path for conveying the recording medium so that an image is formed by the image forming device, a first casing having a portion of the conveyance path, a second casing having a portion of the conveyance path and being openable relative to the first casing, and a third casing having a portion of the conveyance path and being openable relative to the second casing. The relatively openable casings, each having a portion of the conveyance path, provide an image forming apparatus in which a jam can be dealt with easily.

Abstract: A color image forming apparatus forms a color image by superposing images of plural colors in plane-sequential manner. In the color image forming apparatus, the amount of aberration between the detection signal for the recording medium for the first color and the horizontal synchronization signal is measured by a counter, and the start timing of image formation of the second and subsequent colors is controlled by a delay device, according to the measured amount of aberration.

Abstract: An image processing apparatus comprises: a receiving circuit to receive image signals of a plurality of colors, in which the image signals is received for every color by an amount of one image formation unit such as one picture plane; a detector to detect whether the image signals have properly been received by the receiving circuit or not; and an image forming device to form a color image on the basis of the image signals, wherein the image forming process by the image forming device is executed in accordance with the result of the detection by the detector. Even if a communication error was generated, a good color image can be reproduced.

Abstract: An image forming apparatus for forming an image on a transfer material includes: an image bearing member; a device for forming an image on the image bearing member; a developing device for developing the image into a developed image; a transfer material carrying device; an image transfer device; and a cleaner. The developing device is detachably mounted to the image forming apparatus. The cleaner cleans the transfer material carrying device when the developing device is mounted to the main assembly.

Abstract: The present invention provides an image forming apparatus having, an image bearing member; an image forming device for forming an image on the image bearing member; a transfer sheet bearing device for bearing and conveying a transfer sheet, to which a first voltage is applied for transferring the image formed on the image bearing member onto the transfer sheet born by the transfer sheet bearing device; and a discharging device for causing the discharge in the transfer sheet when the transfer sheet is separated from the transfer sheet bearing device, to which a second voltage having the same polarity as that of the first voltage and having a value equal to 80%-120% of the first voltage is applied.