Abstract: An image forming apparatus has a fixing unit for heat fixing an unfixed image formed on a recording material at a nip, with the fixing unit having a rotary fixing member disposed for contacting with the recording material; a heating member for externally heating the rotary fixing member; and a control for stopping revolution of the rotary fixing member in association with a door opening in the image forming apparatus, wherein the heating unit is controlled in association with the door opening and the contact state of the heating member and fixing member.

Abstract: An image forming apparatus has a fixing unit for heat fixing an unfixed image formed on a recording material at a nip, with the fixing unit having a rotary fixing member disposed for contacting with the recording material; a heating member for externally heating the rotary fixing member; and a control for stopping revolution of the rotary fixing member in association with a door opening in the image forming apparatus, wherein the heating unit is controlled in association with the door opening state and the contact state of the heating member and fixing member.

Abstract: The image forming apparatus comprises: fixing means for heat fixing an unfixed image formed on a recording material at a nip, with the fixing means having a rotary fixing member disposed for contacting with the recording material; heating means for externally heating the rotary fixing member; and means for stopping revolution of the rotary fixing member in association with a door opening in the image forming apparatus, wherein the heating means is stopped in association with the door opening. By this, it is possible to prevent degradation of the rotary fixing member.

Abstract: The image forming apparatus has a fixing unit for heat fixing an unfixed image formed on a recording material at a nip, with the fixing unit having a rotary fixing member disposed for contacting with the recording material; a heater for externally heating the rotary fixing member; and a member for stopping revolution of the rotary fixing member in association with a door opening in the image forming apparatus, wherein the heater is stopped in association with the door opening.

Abstract: A first pattern is formed on a recording medium using a dark color substance and light color substance with substantially the same hue by supplying first pattern data to an image forming unit, and the density of the pattern is detected. If a variation in the detected density of the first pattern is not less than a predetermined value, conditions for image forming using the dark color substance and light color substance with the same hue in the image forming unit are corrected on the basis of the density of the first pattern and that of the first pattern data.

Abstract: An image forming apparatus performing development using light toner of a first color and dark toner of the first color includes a control unit configured to control tone in order to set gradation characteristics of an image developed with the light toner; a determination unit configured to determine whether the gradation characteristics of the light toner image are in a desirable state as a result of the tone control by the control unit; and a shift unit configured to shift an area where mixture of the light toner with the dark toner is started, the area corresponding to the desirable state, responsive to the determination unit determining that the gradation characteristics of the light toner image are not in the desirable state.

Abstract: An image forming apparatus includes a plurality of image forming stations each having an image carrier and forming an image on the image carrier; a mark detecting unit for detecting a plurality of registration correction marks formed on a recording medium by the plurality of image forming stations; a correction mechanism for correcting a position difference between images formed by the plurality of image forming stations in accordance with a detection result by the mark detecting unit; and a controller for independently controlling an image forming operation of each of the plurality of the image forming stations so that the image density of each of the registration correction marks formed by the plurality of image forming units has a different predetermined image density.

Abstract: An image forming apparatus includes a plurality of image forming stations each having an image carrier and forming an image on the image carrier; a mark detecting unit for detecting a plurality of registration correction marks formed on a recording medium by the plurality of image forming stations; a correction mechanism for correcting a position difference between images formed by the plurality of image forming stations in accordance with a detection result by the mark detecting unit; and a controller for independently controlling an image forming operation of each of the plurality of the image forming stations so that the image density of each of the registration correction marks formed by the plurality of image forming units has a different predetermined image density.

Abstract: The image forming apparatus comprises: fixing means for heat fixing an unfixed image formed on a recording material at a nip, with the fixing means having a rotary fixing member disposed for contacting with the recording material; heating means for externally heating the rotary fixing member; and means for stopping revolution of the rotary fixing member in association with a door opening in the image forming apparatus, wherein the heating means is stopped in association with the door opening. By this, it is possible to prevent degradation of the rotary fixing member.

Abstract: An image forming apparatus for sequentially superimposes images formed by a plurality of image forming stations for forming images of different colors, respectively, on a transferring material born and transported by a transferring material transporting member, which forms a misregister detection mark on the transferring material transporting member, illuminates to read the mark, calculates a misregister amount of the read misregister detection mark, and corrects the misregister of an image based on calculated results, wherein the apparatus adjusts an illuminating light amount according to a color of a misregister detection mark.

Abstract: An object of the present invention is to improve an efficiency in using bins in a sorter of an image forming system, to which a plurality of personal computers are connected. If the number of the receptacles appointed in accordance with the receptacle appointment command or the number of sets of sheets to be sorted is larger than the number of empty receptacles, offset sorting is performed in which the position, at which the recording sheets are received, is shifted in the same receptacle. If the appointed number of the receptacles or the number of sets of sheets to be sorted is smaller than the number of empty receptacles, a normal sorting process is performed in such a manner that the bins are allotted in accordance with the position of the bins appointed with the command for appointing receptacles or the number of sets of sheets to be sorted.

Abstract: A solar generation system includes a standard solar cell string and a substandard solar cell string. A DC voltage output from the substandard solar cell string is boosted by a booster unit to the level of the DC voltage output from the standard solar cell string, and the DC voltage from the standard solar cell string and the boosted DC voltage are applied to a DC/AC inverter, whereby an AC power is obtained, which is supplied to a utility power supply.

Abstract: An object of the present invention is to improve an efficiency in using bins in a sorter of an image forming system, to which a plurality of personal computers are connected. If the number of the receptacles appointed in accordance with the receptacle appointment command or the number of sets of sheets to be sorted is larger than the number of empty receptacles, offset sorting is performed in which the position, at which the recording sheets are received, is shifted in the same receptacle. If the appointed number of the receptacles or the number of sets of sheets to be sorted is smaller than the number of empty receptacles, a normal sorting process is performed in such a manner that the bins are allotted in accordance with the position of the bins appointed with the command for appointing receptacles or the number of sets of sheets to be sorted.

Abstract: The present invention provides a fixing apparatus that as a fixing member for fixing an unfixed image on a recording material, a containing portion for containing releasing agent, applying device for applying the releasing agent in the containing portion on the fixing member, heating device for heating the releasing agent in the containing portion, and detection device for detecting a temperature of the releasing agent in the containing portion, wherein heating by the heating device is controlled according to a detected temperature from the detection device.

Abstract: An image forming apparatus for sequentially superimposes images formed by a plurality of image forming stations for forming images of different colors, respectively, on a transferring material born and transported by a transferring material transporting member, which forms a misregister detection mark on the transferring material transporting member, illuminates to read the mark, calculates a misregister amount of the read misregister detection mark, and corrects the misregister of an image based on calculated results, wherein the apparatus adjusts an illuminating light amount according to a color of a misregister detection mark.

Abstract: A solar generation system includes a standard solar cell string and a substandard solar cell string. A DC voltage output from the substandard solar cell string is boosted by a booster unit to the level of the DC voltage output from the standard solar cell string, and the DC voltage from the standard solar cell string and the boosted DC voltage are applied to a DC/AC inverter, whereby an AC power is obtained, which is supplied to a utility power supply.

Abstract: The present invention provides a fixing apparatus that as a fixing member for fixing an unfixed image on a recording material, a containing portion for containing releasing agent, applying device for applying the releasing agent in the containing portion on the fixing member, heating device for heating the releasing agent in the containing portion, and detection device for detecting a temperature of the releasing agent in the containing portion, wherein heating by the heating device is controlled according to a detected temperature from the detection device.

Abstract: An image forming apparatus includes a plurality of image forming stations each having an image carrier and forming an image on the image carrier; a mark detecting unit for detecting a plurality of registration correction marks formed on a recording medium by the plurality of image forming stations; a correction mechanism for correcting a position difference between images formed by the plurality of image forming stations in accordance with a detection result by the mark detecting unit; and a controller for independently controlling an image forming operation of each of the plurality of the image forming stations so that the image density of each of the registration correction marks formed by the plurality of image forming units has a different predetermined image density.

Abstract: There is provided an inverter apparatus islanding operation detecting method capable of surely detecting an islanding operation with a simple construction. A distortion for causing a variation in an output frequency of an inverter apparatus in an islanding operation stage is applied to an inverter output waveform. With this arrangement, even when the inverter apparatus is disconnected from an AC power system in a state in which a power factor of a load impedance is proximate to one, a frequency variation is generated in an inverter output, thereby ensuring detection of the islanding operation.

Abstract: A sheet conveying apparatus which can correct a conveying velocity of a sheet is constructed by, a conveying unit to convey the sheet, a reader such as a CCD linear sensor for reading a fringe pattern formed on a pattern sheet while the pattern sheet is conveyed by the conveying unit, a detector to detect a conveying velocity of the pattern sheet on the basis of the pattern read by the reader, and a controller to control a conveying velocity of the conveying unit on the basis of the conveying velocity detected by the detector.