Abstract: An image forming apparatus includes a memory and a controller. The memory is configured to store information related to a recording medium type detected by a detector in the past. The controller is configured to control a feeder so as to prevent feeding of a recording medium from starting, when a printing operation is started in a first mode, in a case that a recording medium type set through a setting unit and a recording medium type discriminated based on the information stored in the memory do not match with each other.

Abstract: An image forming apparatus includes a memory and a controller. The memory is configured to store information related to a recording medium type detected by a detector in the past. The controller is configured to control a feeder so as to prevent feeding of a recording medium from starting, when a printing operation is started in a first mode, in a case that a recording medium type set through a setting unit and a recording medium type discriminated based on the information stored in the memory do not match with each other.

Abstract: A sheet feeding device includes a sheet storage unit, a driving unit, a first detection unit, a second detection unit, and a control unit. The sheet storage unit includes a tray on which a sheet bundle including a plurality of sheets is to be stacked. The driving unit lifts up the tray. The first detection unit detects, at a predetermined position, a top surface of the sheet bundle stacked on the tray and lifted up. The second detection unit detects whether a sheet is stacked on the tray. The control unit controls, while the first detection unit has not detected the top surface of the sheet bundle, the driving unit to lift up the tray at a first speed until the second detection unit detects the sheet, and to lift up the tray at a second speed lower than the first speed after the second detection unit detects the sheet.

Abstract: An image forming apparatus comprises: a detection unit which detects the abnormal condition of the image forming apparatus; a storage unit which stores, as history information, information about a type of the abnormal condition and an occurrence situation of the abnormal condition in a case where the detection unit detects the abnormal condition; a determination unit which determines whether an occurrence frequency of the abnormal condition which has newly occurred is higher than a predetermined frequency; and a notification unit which, in a case where an abnormal condition has newly occurred and the determination unit determines that the occurrence frequency of the abnormal condition which has newly occurred is higher than the predetermined frequency, stops the image forming apparatus and notifies the user of trouble information for making a repair request by the user.

Abstract: A sheet feeding device includes a sheet storage unit, a driving unit, a first detection unit, a second detection unit, and a control unit. The sheet storage unit includes a tray on which a sheet bundle including a plurality of sheets is to be stacked. The driving unit lifts up the tray. The first detection unit detects, at a predetermined position, a top surface of the sheet bundle stacked on the tray and lifted up. The second detection unit detects whether a sheet is stacked on the tray. The control unit controls, while the first detection unit has not detected the top surface of the sheet bundle, the driving unit to lift up the tray at a first speed until the second detection unit detects the sheet, and to lift up the tray at a second speed lower than the first speed after the second detection unit detects the sheet.

Abstract: An image forming apparatus which performs toner discharge control for held toners of respective colors, comprises: an image carrier; a transfer member on which toner images of the respective colors formed on the image carrier are transferred and superposed; a calculation unit configured to calculate toner amounts used to form the toner images of the respective colors; and a control unit configured to superpose toners of at least two colors onto the transfer member when the toner amounts calculated by the calculation unit are smaller than a predetermined consumption amount, wherein the control unit decides a combination of colors of the toners to be superposed in accordance with differences between the toner amounts and the predetermined consumption amount.

Abstract: An image forming apparatus which performs toner discharge control for held toners of respective colors, comprises: an image carrier; a transfer member on which toner images of the respective colors formed on the image carrier are transferred and superposed; a calculation unit configured to calculate toner amounts used to form the toner images of the respective colors; and a control unit configured to superpose toners of at least two colors onto the transfer member when the toner amounts calculated by the calculation unit are smaller than a predetermined consumption amount, wherein the control unit decides a combination of colors of the toners to be superposed in accordance with differences between the toner amounts and the predetermined consumption amount.

Abstract: An image formation apparatus for executing image formation by exposing an image carrier with irradiation light emitted from a laser source on the basis of an input signal to drive the laser source includes a correction amount calculation unit configured to calculate, on the basis of a generated correction pattern, a correction amount to control the ON or OFF timing to drive the laser source, and a signal generation unit configured to generate, on the basis of image data and the correction amount calculated by the correction amount calculation unit, a corrected signal obtained by correcting the input signal to drive the laser source so as to form the image data by controlling the ON or OFF timing.

Abstract: An image forming apparatus includes an image bearing member; toner image formation means for forming a toner image on the image bearing member; removing means for removing deposited matter deposited on the image bearing member; detecting means for detecting a toner image to be detected, formed on the toner image formation means; control means for controlling a toner image forming condition of the toner image forming means in accordance with a result of detection of the toner image to be detected by the detecting means; the apparatus being operable in a mode in which the removing means operates to remove the deposition, and the detecting means operates to detect the toner image to be detected, executing means for executing an operation in the mode; and an operating portion for manually starting execution of the operation in the mode by the executing means.

Abstract: There is provided an image forming apparatus that effectively suppresses an increase in temperature of a heating device by operating an air blowing device when image formation is performed to a small-size recording material, and which can continuously perform the image formation. The image forming apparatus includes a heating device to heat a recording material to be conveyed, a cooling fan that blows air from an air blowing port facing a part of the heating device, and a shutter that moves such that an opening width of the air blowing port is regulated depending on a width of the recording material. The image forming apparatus also includes an error detecting device that detects an error of the cooling fan. When the error detecting device detects an error of the cooling fan, the shutter moves to a position such that image formation is continued.

Abstract: An image forming apparatus capable of reducing a part of a sheet exposed outside the apparatus on standby after finishing printing a first side in both-sided printing. A transfer material P having an image formed on its first side is fed until a part thereof gets exposed outside a full-color printer 1 and is fed to a refeeding path in the full-color printer 1. The transfer material P inverted by a flapper 44 is fed to a standby position to form an image on a second side thereof and is stopped there. In the case where a preparation for forming the image on the second side is not completed, the standby position for having the transfer material P stopped is changed corresponding to length of the inverted transfer material P in a feeding direction.

Abstract: An image forming apparatus includes an image bearing member; toner image formation means for forming a toner image on the image bearing member; removing means for removing deposited matter deposited on the image bearing member; detecting means for detecting a toner image to be detected, formed on the toner image formation means; control means for controlling a toner image forming condition of the toner image forming means in accordance with a result of detection of the toner image to be detected by the detecting means; the apparatus being operable in a mode in which the removing means operates to remove the deposition, and the detecting means operates to detect the toner image to be detected, executing means for executing an operation in the mode; and an operating portion for manually starting execution of the operation in the mode by the executing means.

Abstract: An image forming apparatus includes an image bearing member; toner image formation means for forming a toner image on the image bearing member; removing means for removing deposited matter deposited on the image bearing member; detecting means for detecting a toner image to be detected, formed on the toner image formation means; control means for controlling a toner image forming condition of the toner image forming means in accordance with a result of detection of the toner image to be detected by the detecting means; the apparatus being operable in a mode in which the removing means operates to remove the deposition, and the detecting means operates to detect the toner image to be detected, executing means for executing an operation in the mode; and an operating portion for manually starting execution of the operation in the mode by the executing means.

Abstract: An image forming apparatus that is capable of normally performing second side printing on a transfer material, even if the transfer material put on standby after completion of first side printing is pulled out by a user. A transfer material having image formed on its first side is fed until it is partly exposed to the outside of a printer, and is then fed to a refeeding path in the printer and further fed to a standby position prior to image formation on the second side of the transfer material. When it is detected that the transfer material caused to stop at the standby position is pulled out by a user, a warning to stop pulling out the transfer material is given to the user.

Abstract: Whether an image to be formed has a prescribed M×N pixel pattern is determined by a comparator. If it is determined that the image has the prescribed M×N pixel pattern, then a light-quantity correction signal that is for reducing the current that flows through a semiconductor laser is output to a laser driving circuit when the laser emits a laser beam of a pixel of interest contained in the M×N pixel pattern.

Abstract: An image forming system has an image forming device for forming an image on a recording material in accordance with a set width of the recording material, and an image heating member. A first detecting member which detects a temperature of a first region of the image heating member, the first region corresponding to an outside region of a contact area, the contact area being contactable with a recording material having the set width, a second detecting member which detects a temperature of a second region of the image heating member, the second region corresponding to an inside region of the contact area, a cooling portion cools the first region of the image heating member in accordance with an output of the first detecting member, and a notification portion notifies that the set width of the recording material is wrong in accordance with an output of the first detecting member and an output of the second detecting member.

Abstract: An image forming apparatus includes an image forming apparatus body and a peripheral unit operable to transport a recording medium. The image forming apparatus includes a communication device for communicating with the peripheral unit and a controller for controlling transporting the recording medium by the peripheral unit using a communication by the communication device. The controller sets a plurality of transport speeds, each of which corresponds to a predetermined identification code, to the peripheral unit and specifies the transport speed by using the predetermined identification code to the peripheral unit.

Abstract: An image forming apparatus changes over an electric potential on an image bearing member in response to an attenuation region in which a remaining potential on a developing member is attenuating after a developing bias applied to the developing member has been turned off after completion of an image forming operations. Accordingly, it is possible to mitigate adherence of developer due to a large potential difference between the developing member and the image bearing member.

Abstract: In an image forming apparatus includes a containing device for containing waste toner which is recovered, and a near-end position detecting device that detects that the waste toner is at a near-end position in the containing device, and a judgment feature that the waste toner is full based on image judgement means for judging whether the container after detecting means detects that an amount of toner in the container is full of toner, based on image information of an image formed on a recording material and the adjustment by the adjusting means.

Abstract: An image forming apparatus for carrying out an image forming process with a detachably mountable image forming unit mounted thereon, when the mounting of the image forming unit has been detected, whether the mounted image forming unit is a new one is discriminated. Then, unit control information held by an information holding portion for holding unit control information corresponding to the image forming unit is updated on the basis of the results of discrimination at the last time and this time. By such a construction, image formation becomes executable on the mounted image forming unit always in an optimized state.