An image forming apparatus includes: an image former that performs image forming processing to a plurality of sheets included in each of a plurality of sheet groups; and a hardware processor that detects occurrence of a jam, wherein the image former completes the image forming processing to each of the plurality of sheets included in a sheet group not including a jammed sheet that has generated the jam.

An image forming system that forms an image on the basis of a job, in a case that an operation mode is a first operation mode, performs a control to resume a job suspended because of the conveyance defect when a predetermined signal is recognized after the automatic purge process finishes, and in a case that the operation mode is a second operation mode, performs a control to continually resume a job suspended because of the conveyance defect without waiting for the predetermined signal to be recognized after the automatic purge process finishes.

An image forming apparatus including: a sheet container; a sheet conveyer; a sheet detector; and a controller, wherein, in a case where a leading edge of a first sheet is positioned downstream of a first position in a conveyance direction and a trailing edge of a second sheet preceding the first sheet is positioned downstream of a second position located downstream of the first position when the first and second sheets are stopped based on a result of the sheet detector, the controller causes the sheet conveyer to convey the first sheet in the conveyance direction, and in a case where the leading edge of the first sheet is positioned upstream of the first position when the first and second sheets are stopped, the controller causes the sheet conveyer to convey the first sheet in an opposite direction to return the first sheet to the sheet container.

An image forming apparatus includes: an operating unit configured to display an operation screen, and accept a user operation; a conveying unit configured to convey a sheet along a path to one of a plurality of discharge destinations; an image forming unit configured to form an image on the sheet moving in the path; and a control unit configured to identify a conveyance destination, and cause the conveying unit to convey the sheet to the conveyance destination, wherein, when a jam in the path is detected, the control unit causes the conveying unit to suspend sheet conveyance, and causes the operating unit to display a select screen for selecting a purge destination and accept a purge destination selected by a user, and the control unit identifies a sheet to be moved to the purge destination, and causes the conveying unit to convey the sheet to the purge destination.

A sheet conveying device includes a sheet container, a separation feeder, a plurality of conveyance drivers, a multifeed detector, a sheet detector, and a conveyance controller. The conveyance drivers are driven to convey a sheet to a conveyance completion position on a sheet conveyance path. The multifeed detector detects occurrence of a multifeed on the conveyance path. The sheet detector detects presence or absence of the sheet at a sheet detection point on the conveyance path. The conveyance controller controls the conveyance drivers to be continuously driven until a preceding sheet preceding multifed sheets is conveyed to the conveyance completion position after the multifeed detector detects the occurrence of the multifeed. The conveyance controller controls the conveyance drivers to stop in a period in which at least one of the multifed sheets is present at the sheet detection point after the preceding sheet is conveyed to the conveyance completion position.

A sheet conveyance apparatus which conveys sheets fed from a first sheet feeding unit and sheets fed from a second sheet feeding unit to a merging point, inserts the sheets fed from the first sheet feeding unit into the sheets fed from the second sheet feeding unit in a predetermined order at the merging point, and discharges the sheets fed from the first sheet feeding unit and the sheets fed from the second sheet feeding unit to a downstream side includes: a jam detecting unit configured to detect a jam of a sheet in the first sheet feeding unit; and a control unit configured to newly feed sheets which are before the predetermined order, in which a sheet causing the jam is supposed to be inserted, and have not been fed from the second sheet feeding unit, and convey the newly fed sheets to the downstream side.

Disclosed is an image forming system, which makes it possible to effectively eject the jam-subsequent paper sheet remaining therein. In the system, a primary abnormal state in which the conveyance operation cannot be continued, and a secondary abnormal state in which an adverse influence is possibly incurred to the image formed on the paper sheet though it is possible to continue the conveyance operation, are defined. In the state that the primary abnormal state or the secondary abnormal state is detected in midcourse of the conveyance operation, when a pre-purge processing for conveying the jam-subsequent paper sheet is implemented so as to eject the jam-subsequent paper sheet onto the ejecting tray, controlling operations are conducted so as to continue the conveyance operation without halting the conveyance operation, even if the secondary abnormal state in respect to the jam-subsequent paper sheet is detected in midcourse of performing the pre-purge processing thereof.

An image forming apparatus includes a first conveying path, a second conveying path, a detector, a conveyance guide member and an interlock mechanism. The first conveying path communicates the second conveying path through which a sheet supplied from a supply part is conveyed. The detector detects whether or not the sheet is present in the first conveying path. The conveyance guide member composes the second conveying path and one end part thereof is pivotally supported so as to be able to open/close the second conveying path. The interlock mechanism interlocks the detector with the opening/closing operation of the conveyance guide member. The detector detects the opening/closing operation of the conveyance guide member.

A post-processing apparatus of an embodiment includes a first tray configured to receive a sheet on which the post processing is not executed by a processing section, a second tray configured to temporarily place a sheet, an inlet roller configured to carry in a sheet discharged from an image forming apparatus into the post-processing apparatus, a first roller configured to convey the sheet to the first tray, a second roller configured to convey the sheet to the second tray, a detection sensor configured to detect whether or not there is sheet being conveyed in a sheet conveyance path from the inlet roller to the first or the second tray, and a roller control section configured to drive the first or the second roller if an image forming apparatus stops the discharge of the sheet that is being printed and the detection sensor detects the sheet.

When a jam is detected in a post-processing device, a purge controller first makes a conveyance roller group and a reverse roller continue conveyance. The purge controller then sets the conveyance destination of a leading sheet that will first arrive at a branch point after the time of detection of the jam. When a first condition is satisfied the purge controller sets the conveyance destination to a reverse slot, and when a second condition is satisfied the purge controller sets the conveyance destination to an outlet path. The first condition is satisfied when no other sheet is present in the reverse slot at the time of detection of the jam, and the second condition is satisfied when another sheet is present in the reverse slot at the time of detection of the jam.