An image forming system includes an image forming apparatus having an apparatus main body, a sheet feeding cassette, a manual bypass tray, an opening/closing detection part and a sheet feeding source setting part. The apparatus main body has an input part to which a printing instruction is input. The manual bypass tray is displaced into an open posture and into a close posture. The sheet feeding source setting part sets the sheet feeding cassette or the manual bypass tray as a sheet feeding source. When the opening/closing detection part detects that the manual bypass tray is displaced from the close posture to the open posture and the printing instruction is input to the input part, regardless of the sheet feeding source input to the input part, the sheet feeding source setting part sets the manual bypass tray as the sheet feeding source.

A paper feeder includes: first and second accommodation units which are arranged side by side in a casing along a recording paper conveyance direction and in which recording paper is loaded in a specified accommodation orientation; and an erroneous loading detection unit which is provided in a non-loaded region between the first and second accommodation units, detects whether or not the recording paper is loaded, and detects recording paper accommodated in an orientation other than the specified accommodation orientation, wherein the paper feeder can shift a bundle of the recording paper loaded in the second accommodation unit to the first accommodation unit arranged on a downstream side of the recording paper conveyance direction.

An image forming apparatus configured to change an interleaf control mode from a not confirmed sheet-feeding mode to a sheet-presence confirmed sheet-feeding mode when a remaining amount of recording sheets is less than a first threshold, wherein the image forming apparatus has a first mode of changing a feeding origin of a recording sheet, according to detection of absence of a recording sheet in a storage unit by a sheet presence/absence detection unit during execution of an image forming job, and a second mode of changing a feeding origin of a recording sheet, according to detection of a recording-sheet remaining amount of the storage unit less than a second threshold during execution of an image forming job, and wherein the second threshold is larger than the first threshold for changing an interleaf control mode.

An image forming apparatus (10) is capable of continuing, when detecting running out of sheet in a cassette (130a) during image formation, the image formation by performing switching to another cassette (130b). When it is determined that sheets are run out based on a signal supplied from a sheet sensor (131a) of a cassette being used after exposure is started based on image data of a certain page, cleaning is performed on a secondary transfer roller (106) and exposure is started based on the image data of a target page before the cleaning is terminated.

According to at least one embodiment, an image forming apparatus includes a first sensor, a second sensor, and a controller. The first sensor is configured to detect a user. The second sensor is configured to detect a sheet in a sheet holder. The controller is configured to change a transition mode of an operation mode based on a first detection result of the sheet in the sheet holder by the second sensor in response to the detection of the user by the first sensor when the operation mode of the image forming apparatus is a second power-saving mode, which consumes less power than a first power-saving mode.

An image forming apparatus includes a load detection sensor located on a feeder to detect whether a print medium is loaded on the feeder, an overload detection sensor to detect an overload state of a discharger, and a controller to detect a width of the print medium according to a combination of a feeder load state of a feeder load detection signal of the load detection sensor and an overload state of a discharger overload detection signal of the overload detection sensor and control an image former to perform printing by applying different print modes according to the detected width of the print medium.

An image forming apparatus (10) is capable of continuing, when detecting running out of sheet in a cassette (130a) during image formation, the image formation by performing switching to another cassette (130b). When it is determined that sheets are run out based on a signal supplied from a sheet sensor (131a) of a cassette being used after exposure is started based on image data of a certain page, cleaning is performed on a secondary transfer roller (106) and exposure is started based on the image data of a target page before the cleaning is terminated.

An image forming apparatus configured to change an interleaf control mode from a not confirmed sheet-feeding mode to a sheet-presence confirmed sheet-feeding mode when a remaining amount of recording sheets is less than a first threshold, wherein the image forming apparatus has a first mode of changing a feeding origin of a recording sheet, according to detection of absence of a recording sheet in a storage unit by a sheet presence/absence detection unit during execution of an image forming job, and a second mode of changing a feeding origin of a recording sheet, according to detection of a recording-sheet remaining amount of the storage unit less than a second threshold during execution of an image forming job, and wherein the second threshold is larger than the first threshold for changing an interleaf control mode.

An image forming apparatus includes a storage unit that stores recording sheets, an image forming unit that forms an image on a recording sheet, an insertion unit that inserts an interleaving sheet between recording sheets, a first detection unit configured to detect presence or absence of a recording sheet in the storage unit, a second detection unit configured to detect a remaining amount of recording sheets in the storage unit, and a control unit configured to control sheet feeding start timing of the interleaving sheet based on detection results acquired by the first detection unit and the second detection unit

An image forming apparatus is operable in a first mode in which a control unit is in a rest state and a second mode in which electric power is supplied to the control unit. The image forming apparatus changes the mode of the operation to the second mode of an operation in response to change of detection of a detecting portion from presence of the sheet on a manual feeding tray to absence thereof during execution of the operation in the first mode with a pressing mechanism being in the second position, and then in response to receipt of input of a predetermined instruction about an image forming operation by a receiving portion in the second mode, the control unit controls the moving mechanism so that the pressing mechanism moves from the low pressure position to a nip-forming position.