Abstract: An opening and closing means is disposed on a side of the main body, and provides a pair of carrying means, a transcribing roller and a pair of discharging sheet carrying means. Thereby, there can be provided the image forming apparatus easy to access to sheet remaining in the apparatus.

Abstract: An image forming apparatus includes a photosensitive belt carried by a driver device, for forming a toner image thereon; an internal transcription belt for transcribing the toner image; and a transcription portion for transcribing the toner image, which is transcribed on the internal transcription belt, onto a recording medium. A transcription side roller is suspended with the internal transcription belt thereon, and disposed on a side of a photosensitive belt side roller. Detectors detect a first cycle of the internal transcription belt, and a second cycle, which starts measurement delaying by ½ cycle of the photosensitive belt side roller from the first cycle measurement start. A controller conducts speed compensation of the photosensitive belt by referring to the first cycle and the second cycle, wherein the internal transcription belt is in contact with the photosensitive belt, so that it is carried following thereafter.

Abstract: An image forming apparatus, comprising: a photosensitive belt being carried by a driver device, for forming a toner image thereon; an internal transcription belt for transcribing the toner image thereon, which is formed on said photosensitive belt; and a transcription portion for transcribing the toner image, which is transcribed on said internal transcription belt, onto a recording medium, further comprising: a transcription side roller, being suspended with said internal transcription belt thereon, and disposed on a side of a photosensitive belt side roller, which is disposed on a side of said photosensitive belt, and a transcription side roller, which is disposed on a side of said transcription side; means for detecting a first cycle of said internal transcription belt; and means for detecting a second cycle, which starts measurement delaying by ½ cycle of said photosensitive belt side roller from the first cycle measurement start; a controller means for conducting speed compensation of said photose

Abstract: A picture image forming apparatus including a photoreceptor belt driven by a drive device, a plurality of developing devices for forming toner picture images on the photoreceptor belt, an intermediate transfer device, to a surface of which toner picture images on the photoreceptor belt are overlappingly transferred plural times when a picture image is to be formed on a single page, and a transfer roller for pushing a sheet against the intermediate transfer device in order to transfer toner picture images to the sheet. The intermediate transfer device is an intermediate transfer belt contacted by the photoreceptor belt to be driven thereby. A photoreceptor-side roller enables contact of the intermediate transfer belt and the photoreceptor belt, and the intermediate transfer belt is trained around the photoreceptor-side roller and a transfer-side roller for pushing the sheet against the transfer roller. A diameter d2 of the transfer-side roller is smaller than a diameter d1 of the photoreceptor-side roller.

Abstract: An image forming system including multiple photoconductors arranged in a line extending in a vertical direction and forming one body as one unit, and multiple development devices and multiple exposure devices arranged on one side of the line of the multiple photoconductors. An image is transferred to a recording medium on an other side of the line of the multiple photoconductors.

Abstract: A color electrophotographic apparatus eliminates necessity of mechanism for urging the developer from the front side. The developer is placed away from a photo conductor. On both sides of the developer, mutually cooperated gears are provided. One of the gear meshes with a drive gear with a clutch for driving the developer. The other gear is meshed with a brake gear coupled with a brake mechanism whose brake function can be turned On and OFF by an electric signal. The drive gear is arranged to urge the developer onto the photo conductor by rotation thereof. When the gear of the developer rotates, the brake gear is arranged at a position to urge the developer onto the photo conductor. The torque to start slippage of the brake is set at a value to be greater than a force of a spring pushing back the developer.

Abstract: An electrophotographic image forming system having a form cassette for storing forms, a transfer unit for forming an image, a feeder for feeding the forms to the transfer unit and a fusing device for fusing transferred image of the form. The electrophotographic image forming system provides in a path for feeding the form with unfused colored particles (toner) deposited thereon, a form guide so as to contact the non-printing area of the surface of the form with unfused colored particles (toner) deposited thereon.

Abstract: An image forming system including multiple photoconductors arranged in a line extending in a vertical direction and forming one body as one unit, and multiple development devices and multiple exposure devices arranged on one side of the line of the multiple photoconductors. An image is transferred to a recording medium on an other side of the line of the multiple photoconductors.

Abstract: A color electrophotographic apparatus eliminates necessity of mechanism for urging the developer from the front side. The developer is placed away from a photo conductor. On both sides of the developer, mutually cooperated gears are provided. One of the gear meshes with a drive gear with a clutch for driving the developer. The other gear is meshed with a brake gear coupled with a brake mechanism whose brake function can be turned On and OFF by an electric signal. The drive gear is arranged to urge the developer onto the photo conductor by rotation thereof. When the gear of the developer rotates, the brake gear is arranged at a position to urge the developer onto the photo conductor. The torque to start slippage of the brake is set at a value to be greater than a force of a spring pushing back the developer.

Abstract: A picture image forming apparatus comprising a photoreceptor belt driven by a drive device, a plurality of developing devices for forming toner picture images on the photoreceptor belt, an intermediate transfer device, to a surface of which toner picture images on the photoreceptor belt are overlappingly transferred plural times when a picture image is to be formed on a single page, and a transfer roller for pushing a sheet against the intermediate transfer device in order to transfer toner picture images to the sheet, and wherein the intermediate transfer device is an intermediate transfer belt contacted by the photoreceptor belt to be driven thereby, and the intermediate transfer belt is trained around a photoreceptor-side roller and a transfer-side roller for pushing the sheet against the transfer roller, and wherein a diameter d2 of the transfer-side roller is smaller than a diameter d1 of the photoreceptor-side roller.

Abstract: An image forming system having multiple photoconductors arranged in a line and forming one body as one unit, multiple development devices and multiple exposure devices arranged on one side of the line of the multiple photoconductors, an intermediate transfer device arranged on the other side of the line of the multiple photoconductors and a form cassette arranged below the line of the multiple photoconductors. The image forming system further includes a transfer device and a fusing device arranged at an opposite side of the intermediate transfer device with respect to the line of the multiple photoconductors.

Abstract: An electrophotographic image forming system having a form cassette for storing forms, a transfer unit for forming an image, a feeder for feeding the forms to the transfer unit and a fusing device for fusing transferred image of the form. The electrophotographic image forming system provides in a path for feeding the form with unfused colored particles (toner) deposited thereon, a form guide so as to contact the non-printing area of the surface of the form with unfused colored particles (toner) deposited thereon.

Abstract: An image forming system having multiple photoconductors arranged in a line and forming one body as one unit, multiple development devices and multiple exposure devices arranged on one side of the line of the multiple photoconductors, an intermediate transfer device arranged on the other side of the line of the multiple photoconductors and a form cassette arranged below the line of the multiple photoconductors. The image forming system further includes a transfer device and a fusing device arranged at an opposite side of the intermediate transfer device with respect to the line of the multiple photoconductors.

Abstract: In order to provide an image forming system characterized by compact configuration, high speed printing, high picture quality recording and excellent maintainability without image misregistration, an image forming system is provided, wherein multiple photoconductors are arranged along one of the surfaces of the intermediate transfer belt which is elongated in the longitudinal direction, and a fusing device is located on the other surface, with the photoconductors being integrated in one unit.

Abstract: In order to provide an electrophotographic image forming system characterized by a mechanism of stabilizing the behavior of the tip of the form when the form with unfused colored particles (toner) deposited thereon is fed to the fusing device, the present invention has a form posture correcting protrusion provided on the non-printing area of the surface of the form with unfused colored particles (toner) deposited thereon inside the feed path of the form with unfused colored particles (toner) deposited thereon, so that form behavior can be controlled when the form is fed to the fusing device. Furthermore, the present invention has a form guide provided on the form ejection side of the fusing device to control the behavior of the form moving in the direction of being wound on the fusing roller.

Abstract: An electrophotographic apparatus comprising: a housing; a photosensitive member electrified by an electrification device; an exposure device for forming an electrostatic latent image onto the photosensitive member; a developing device for forming a toner image onto the photosensitive member; an intermediate transfer body to which the toner image is to be transferred; a transfer device for transferring the toner image formed on the intermediate transfer body onto a paper; a fixing device for heating the toner image on the paper; device for ejecting the paper outside the housing; device for exhausting the heat derived from the fixing device outside the housing; a cover provided on an upper portion of the fixing device; and an airflow path extending in a longitudinal direction of the fixing device and being provided by the cover and the housing, wherein the heat exhausting device is provided in an end portion of the airflow path.

Abstract: Two pairs of legs are fitted under two side plates of an electrophotography apparatus, respectively. The two legs in one pair fitted under one of the side plates are disposed on either side of and are spaced from a point which is a cross point of a line joining these two legs, and a line perpendicular to this line, which perpendicular line passes through a projected point obtained by projecting the center of gravity of the electrophotography apparatus onto a horizontal plane on which the apparatus is set up. The two legs in the pair fitted under the other one of the side plates are disposed on either side of and are spaced from a point which is a cross point of a line passing these two legs and a line perpendicular to this line, which perpendicular line passes through the projected point of the center of gravity. The ratio of a shorter distance to a longer distance, of two distances: one between the two legs in a pair and the other between the two legs in the other pair is set to a value of 1/5 to 1/3.

Abstract: A color image forming apparatus is capable of reducing color deviation of an image due to the influence of a variation in load of an intermediate transfer member and of carrying out high speed printing. A control unit for controlling an image forming process on the basis of the size of a recording medium sets, where a recording medium of a size smaller than the longest image length capable of forming a color image is subject to continuous image formation, a first mode for continuously carrying out a development process for forming a latent image and a toner image, and a second mode of incorporating a stop process for stopping the development process in the midst of the development process. This enables reduction of color deviation of an image caused by the influence of a variation in load of an intermediate transfer member and high speed printing also.