According to one embodiment, a sheet post-processing device includes a first tray to receive sheets from an image forming unit, a second tray to receive sheets from the first tray, and a third tray to receive sheets from the second tray. The third tray is movable relative to the second tray. A bundle claw is configured to move sheets in a first direction from the second tray to the third tray. A controller is configured to move the third tray relative to the second tray according to the sheets on the second tray. Depending on various characteristics of the sheets on the second tray or the presence of sheets already on the third tray, the position of the third tray may be changed to reduce possible misalignments of sheets in the transfer from the second to third tray.

According to one embodiment, a sheet post-processing device includes a first tray to receive sheets from an image forming unit, a second tray to receive sheets from the first tray, and a third tray to receive sheets from the second tray. The third tray is movable relative to the second tray. A bundle claw is configured to move sheets in a first direction from the second tray to the third tray. A controller is configured to move the third tray relative to the second tray according to the sheets on the second tray. Depending on various characteristics of the sheets on the second tray or the presence of sheets already on the third tray, the position of the third tray may be changed to reduce possible misalignments of sheets in the transfer from the second to third tray.

In an image forming apparatus, a first conveyance part conveys a sheet, a detection unit detects a leading edge of the sheet conveyed by the first conveyance part, a second conveyance part is provided downstream of the detection unit in a conveyance direction of the sheet and conveys the sheet, a measurement unit measures a conveyance time of the sheet from when conveyance of the sheet by the first conveyance part is started until the leading edge of the sheet is detected by the detection unit, and an estimation unit estimates a remaining lifetime of the second conveyance part based on the conveyance time measured by the measurement unit.

In an image forming apparatus, a first conveyance part conveys a sheet, a detection unit detects a leading edge of the sheet conveyed by the first conveyance part, a second conveyance part is provided downstream of the detection unit in a conveyance direction of the sheet and conveys the sheet, a measurement unit measures a conveyance time of the sheet from when conveyance of the sheet by the first conveyance part is started until the leading edge of the sheet is detected by the detection unit, and an estimation unit estimates a remaining lifetime of the second conveyance part based on the conveyance time measured by the measurement unit.

A printer includes: a printing head; a conveyor; a cutter for cutting the medium to provide a segmented medium; a discharge roller; a counter roller; a sensor for detecting whether the segmented medium remains between the discharge roller and the counter roller; and a controller configured to perform: setting an operation mode to one of a first mode and a second mode depending on a medium kind; controlling the printing head and the conveyor to perform a first print control on the medium; controlling the sensor to detect whether the segmented medium has been removed; and permitting a second print control to be performed. When the operation mode is the first mode, the second print control is permitted after the sensor detects whether the segmented medium has been removed. When the operation mode is the first mode, the second print control is permitted without controlling the sensor.

An image forming system includes an image forming apparatus and a stacker that includes a discharged paper storage and a transporter, the discharged paper storage storing a sheet discharged from the image forming apparatus, and the transporter transporting the sheet to the discharged paper storage, wherein the image forming apparatus includes: an image former that forms an image on the sheet designated for a job and generates printed matter; and a hardware processor that performs control to cause the transporter to discharge a buffer sheet to the discharged paper storage, in which the printed matter is not discharged, before the job is executed, and that executes the job after the buffer sheet transported through the transporter is stored in the discharged paper storage to cause the transporter to transport the printed matter, which is generated by the image former, and cause the discharged paper storage to store the printed matter.

An image forming apparatus performs printing of a plurality of copies of a document in response to execution of a printing job. Each copy includes a plurality of sheets. The image forming apparatus includes a first ejection tray; a second ejection tray; and a first sensor; and circuitry. The circuitry is configured to: start sheet ejection to the first ejection tray; switch a sheet-ejection destination to the second ejection tray in response to detecting that the first ejection tray is at a full level during printing of a first copy; calculate an amount of vacant space of the second ejection tray in response to completion of the printing of the first copy; and perform printing of a second copy to the second ejection tray or to suspend the execution of the printing job, based on the amount of vacant space.

An image forming apparatus performs printing of a plurality of copies of a document in response to execution of a printing job. Each copy includes a plurality of sheets. The image forming apparatus includes a first ejection tray; a second ejection tray; and a first sensor; and circuitry. The circuitry is configured to: start sheet ejection to the first ejection tray; switch a sheet-ejection destination to the second ejection tray in response to detecting that the first ejection tray is at a full level during printing of a first copy; calculate an amount of vacant space of the second ejection tray in response to completion of the printing of the first copy; and perform printing of a second copy to the second ejection tray or to suspend the execution of the printing job, based on the amount of vacant space.

A paper sheet processing apparatus including a plurality of transport units connected in a transport direction to which a paper sheet is transported, each of the plurality of transport units including a paper sheet detection sensor configured to detect presence/absence of the paper sheet, a transport mechanism configured to transport the paper sheet, driving means configured to drive the transport mechanism, and a controller unit configured to control the driving means, wherein the controller unit controls the driving means so that the paper sheet is transported by the transport mechanism based on a detection result of the paper sheet detection sensor.

A sheet sorting apparatus includes a first tray detachable from an apparatus main body, a second tray arranged below the first tray, a discharge unit to discharge a sheet to the first or second tray, a tray detecting unit to detect that the first tray is detached from the apparatus main body, a full stack detecting unit to detect a fully stacked condition of the first tray, and a control unit to control the discharge unit. In a case where the tray detecting unit detects that the first tray is detached from the apparatus main body, the control unit controls the discharge unit not to discharge a sheet to the second tray when a number of sheets discharged to the second tray reaches a threshold number of sheets, even though the full stack detecting unit does not detect the fully stacked condition.