A stacker device in an items processing system is a last station of a mail line. The stacker device has a receiving plate to receive flat items, a longitudinal alignment wall, graduated in at least two steps, at a rear side of the stacker device, and a stop wall that is arranged at the downstream end of the receiving plate.

A stacker device in an items processing system is a last station of a mail line. The stacker device has a receiving plate to receive flat items, a longitudinal alignment wall, graduated in at least two steps, at a rear side of the stacker device, and a stop wall that is arranged at the downstream end of the receiving plate.

A main tray can be exposed from and stored in an image forming apparatus main body by being pivotably supported by the image forming apparatus main body, and when the main tray is exposed from the image forming apparatus main body, a sheet can be placed on the main tray and a sheet can be supplied from the main tray into the image forming apparatus main body. The main tray includes a sheet placing portion and a width alignment cursor. The width alignment cursor is disposed on the sheet placing portion to align the width of a sheet. The width alignment cursor moves in the width direction of the sheet in conjunction with the main tray being stored in the image forming apparatus main body.

A sheet stacking unit of the disclosure includes a sheet stacking plate, a cursor, and a detection sensor. The cursor includes an alignment part for performing widthwise alignment of a document, and a rack extending along the widthwise direction. The detection sensor is placed opposite the rack, and has a light-emitting portion and a light-receiving portion. A plurality of detection-object parts placed in the rack along the widthwise direction have optical characteristics of different reflectivities or transmissivities from one another with respect to light emitted from the light-emitting portion. The controller detects a widthwise size of the document on a basis of output values from the detection sensor which detects light reflected or transmitted by the detection-object parts.

A sheet containing device, which is included in a sheet feeder and an image forming apparatus, includes a first sheet container, a second sheet container disposed adjacent to the first sheet container, a transfer unit to transfer a bundle of sheets contained in the second sheet container to the first sheet container, a pair of side fences including a first side fence and a second side fence to regulate a position of the bundle of sheets in a width direction of the bundle of sheets loaded on the first sheet container, and a pressing unit mounted on the first side fence and pressing the bundle of sheets loaded on the first sheet container against the second side fence.

A sheet material adhesive agent application method includes first and second actions. The first action is performed sequentially for stacked multiple sheet materials. The first action is implemented by: taking out an uppermost one of the multiple sheet materials; transferring the taken-out sheet material to an adhesive agent application stage; and applying the adhesive agent to the transferred sheet material at the adhesive agent application stage. The second action is performed in advance to the first action, wherein the second action is implemented by setting an uppermost group of sheet materials so that each sheet material of the uppermost group has a predetermined curvature projecting upward. The first action is completed before the sheet material is restored to a state before the second action.

Examples include a vibratory device that includes a pivotably arranged pile bearing device that defines a bearing plane, and that separates an upper half-space from a lower half-space. The vibratory device includes a front stop that can limit a pile forming region, a lateral stop, and a pile aeration device that includes a gas discharge device that is arrangeable relative to the pile bearing device. The gas discharge device is arranged to be transferrable between a lowered position and an aeration position. In the aeration position, the gas discharge device is at least partly arranged in the upper half-space, and when in the lowered position, the gas discharge device is arranged completely in the lower half-space. The pile aeration device may serve as a rear blower device and, based on a first transport direction, the pile forming region is arranged between the gas discharge device and the front stop.

A sheet-supply tray device for use with an image recording apparatus, includes a lower sheet-supply tray and an upper sheet-supply tray. The upper sheet-supply tray includes a main body, a leading-end stopper, a trailing-end stopper and a side-end stopper. The main body includes a support surface that supports a recording sheet. The leading-end stopper is fixed on the main body and stops a leading end of the recording sheet. The trailing-end stopper includes a trailing-end contact surface having a trailing-end protrusion extending over an upper surface of a trailing-end portion of the recording sheet toward the leading-end stopper. The trailing-end contact surface contacts a trailing end of the recording sheet. The side-end stopper includes a side-end contact surface that contacts a side end of the recording sheet. The side-end contact surface has at least one side-end protrusion extending over an upper surface of a side-end portion of the recording sheet.

A stacker device in an items processing system is a last station of a mail line. The stacker device has a receiving plate to receive flat items, a longitudinal alignment wall, graduated in at least two steps, at a rear side of the stacker device, and a stop wall that is arranged at the downstream end of the receiving plate.

The present invention is to provide a sheet feeding apparatus to feed a sheet including a pressing member that presses and regulates one end in the width direction of sheets on a stack tray, an urging member that urges the pressing member, and an urging force changing mechanism that changes an urging force of the urging member in accordance with a sheet thickness, the urging force changing mechanism provides a pressing force in accordance with a sheet kind, so that sheets can be reliably aligned and fed in an appropriate posture.