Abstract: In an image forming system including an apparatus main-body and a control portion which controls a fixing operation, to the apparatus main-body, a first fixing unit including a first heater and a second fixing unit including a second heater, which is different from the first heater, can be selectively attached, and each of the first and second fixing units has an information processing portion which transmits data including identification information and temperature information related to a temperature detected by a temperature detection element to the control portion, and the control portion discriminates which of the first fixing unit and the second fixing unit, the fixing unit attached to the apparatus main-body is on the basis of the identification information from the information processing portion and controls the fixing operation by the fixing unit on the basis of the temperature information.

Abstract: An image forming system in which a first control unit transmits, in a state there identification information is not set in an external apparatus, a confirmation command for confirming a state of the external apparatus to a second control unit before the first control unit transmits a registration command to the second control unit.

Abstract: An image forming system in which a first control unit transmits, in a state there identification information is not set in an external apparatus, a confirmation command for confirming a state of the external apparatus to a second control unit before the first control unit transmits a registration command to the second control unit.

Abstract: A printing system includes an image forming apparatus that accepts a printing instruction from a mobile terminal, sends an inquiry to a server as to whether a printing reservation corresponding to the accepted printing instruction is managed by the server, and transmits connection information to the mobile terminal if the printing reservation is managed by the server. The image forming apparatus obtains printing data corresponding to the printing instruction from the mobile terminal set in the connected state, executes printing processing using the obtained printing data, and sets communication with the mobile terminal to an unconnected state after execution of the printing processing is complete. If the printing reservation corresponding to the accepted printing instruction is not managed by the server, the printing instruction accepted from the mobile terminal is rejected and the connection information is not transmitted to the mobile terminal.

Abstract: In the image forming apparatus, accepting a printing instruction from the mobile terminal, inquiring whether the management server manages a printing reservation corresponding to a printing instruction when the printing instruction is accepted, transmitting connection information to the mobile terminal when the printing reservation corresponding to the printing instruction is managed as a result of an inquiry, setting communication with the mobile terminal as a connected state when a connection request from the mobile terminal using the connection information, obtaining printing data corresponding to the printing instruction from the mobile terminal set in the connected state, and executing printing processing using the printing data. Communication with the mobile terminal is set to an unconnected state after execution of the printing processing is complete.

Abstract: Provided is an image forming apparatus for driving a cassette pickup roller (17) and a registration roller (18) by using the same driving source, in which a conveyance control portion (221) starts conveyance speed control for a subsequent sheet, which is fed from a sheet feeding position subsequently to a preceding sheet fed therefrom earlier, when it is determined that a trailing edge of the preceding sheet has passed through the registration roller (18).

Abstract: Provided is an image forming apparatus for driving a cassette pickup roller (17) and a registration roller (18) by using the same driving source, in which a conveyance control portion (221) starts conveyance speed control for a subsequent sheet, which is fed from a sheet feeding position subsequently to a preceding sheet fed therefrom earlier, when it is determined that a trailing edge of the preceding sheet has passed through the registration roller (18).

Abstract: Provided is an image forming apparatus for driving a cassette pickup roller (17) and a registration roller (18) by using the same driving source, in which a conveyance control portion (221) starts conveyance speed control for a subsequent sheet, which is fed from a sheet feeding position subsequently to a preceding sheet fed therefrom earlier, when it is determined that a trailing edge of the preceding sheet has passed through the registration roller (18).

Abstract: Patch background data at each position of a background where a toner patch is formed in the second rotation is estimated from background measurement data at a plurality of positions detected in the first rotation and patch neighborhood measurement data detected in the second rotation at a plurality of positions where no toner patch is formed. Since the apparatus can execute density measurement before the light emission amount of a density sensor stabilizes, the time required for density measurement can be shorter than before. Since the change ratio of the light emission amount and the variation of the reflected light amount from the background are reflected on the patch background data, the density measurement accuracy can be improved.

Abstract: Provided is an image forming apparatus for driving a cassette pickup roller (17) and a registration roller (18) by using the same driving source, in which a conveyance control portion (221) starts conveyance speed control for a subsequent sheet, which is fed from a sheet feeding position subsequently to a preceding sheet fed therefrom earlier, when it is determined that a trailing edge of the preceding sheet has passed through the registration roller (18).

Abstract: Patch background data at each position of a background where a toner patch is formed in the second rotation is estimated from background measurement data at a plurality of positions detected in the first rotation and patch neighborhood measurement data detected in the second rotation at a plurality of positions where no toner patch is formed. Since the apparatus can execute density measurement before the light emission amount of a density sensor stabilizes, the time required for density measurement can be shorter than before. Since the change ratio of the light emission amount and the variation of the reflected light amount from the background are reflected on the patch background data, the density measurement accuracy can be improved.