A post-processing apparatus for an image forming apparatus includes a processing tray on which a sheet bundle is placed for discharging onto a discharge tray, a detector configured to detect presence or absence of the sheet bundle on the processing tray, and a controller. The controller is configured to control driving of the processing tray to discharge the sheet bundle onto the discharge tray and to determine whether or not to output an error if a detection result of the detector after the processing tray has been driven to discharge the sheet bundle onto the discharge tray indicates presence of the sheet bundle. The controller outputs the error if the sheet bundle is not a last sheet bundle of a post-processing job and does not output the error if the sheet bundle is the last sheet bundle of the post-processing job.

A sheet conveying apparatus has a belt with a widthwise side portion extending in a traveling direction of the belt, the widthwise side portion including a portion defining a notch being recessed in a width direction orthogonal to the traveling direction, the notch being defined by less than an entire length, in the traveling direction, of the widthwise side portion, a contacting member arranged to be in contact with an end portion of a sheet to be conveyed, the contacting member being attached to the belt so that at least a part of the contacting member is arranged in the notch of the belt, a regulating portion configured to regulate a position of the belt in the width direction by contacting with the widthwise side portion of the belt, and a driving portion configured to drive the belt.

A post-processing apparatus for an image forming apparatus includes a processing tray on which a sheet bundle is placed for discharging onto a discharge tray, a detector configured to detect presence or absence of the sheet bundle on the processing tray, and a controller. The controller is configured to control driving of the processing tray to discharge the sheet bundle onto the discharge tray and to determine whether or not to output an error if a detection result of the detector after the processing tray has been driven to discharge the sheet bundle onto the discharge tray indicates presence of the sheet bundle. The controller outputs the error if the sheet bundle is not a last sheet bundle of a post-processing job and does not output the error if the sheet bundle is the last sheet bundle of the post-processing job.

A device for alignment of a book block consisting of single sheets and/or signatures is useable in a processing machine, in which manufacturing of books or printed products is carried out. The device is arranged upstream of a first processing station within the processing machine. The book block is feedable directly or indirectly into the device automatically or by hand. An alignment station has a base plate with a substantially vertically extending stop surface at an end thereof. The base plate has a movable part configured to carry out a movement with respect to the stop surface such that the movement of the movable part, in an operative connection to the stop surface, brings about an alignment of the single sheets and/or signatures at a book block edge, and such that, following alignment, the book block is grippable by at least one transport clamp for processing.

A sheet material feeding device includes: a housing; a cassette configured to accommodate a sheet material therein and capable of being pulled out of the housing; a pushing-up plate which is on the cassette and configured to fluctuate and a position thereof is changed to a feeding position or a retracted position; a rear-end regulating member for regulating a position of an upstream end of the sheet material; a rear-end displacement member which is supported by the rear-end regulating member and configured to fluctuate and a position thereof is changed to a feeding position or a retracted position; a pushing-up plate displacing device configured to change the position of the pushing-up plate to the feeding position; and a rear-end displacement member displacing device configured to complete a position change of the rear-end displacement member to the feeding position before a position change of the pushing-up plate to the feeding position.

An image forming apparatus includes: a cassette including a first and a second sheet storage areas, arranged side by side, each on which a sheet having a predetermined size is placeable; a sheet feeder configured to feed the sheet from the first area to an image forming portion; a first sheet sensor; a second sheet sensor; a movement member configured to move the sheet from the second area to the first area when no sheet placed on the first area is detected by the first sheet sensor and the sheet placed on the second area is detected by the second sheet sensor; and an annunciator configured to annunciate that a sheet having a size different from the predetermined size is placed on the cassette when the first sheet sensor does not detect the sheet after a completion of a movement of the sheet.

A sheet feeding apparatus includes a first sheet storage portion and a second sheet storage portion disposed side by side with the first sheet storage portion. The sheet feeding device includes a sheet bundle moving member configured to transfer sheets in the second sheet storage portion to the first sheet storage portion and a pickup roller configured to feed the sheet by abutting against the sheet stored in the first sheet storage portion. When transferring the sheet bundle in the second sheet storage portion to the first sheet storage portion, the pickup roller is rotated in the same direction as that during feeding.

A sheet conveying apparatus has a belt with a widthwise side portion extending in a traveling direction of the belt, the widthwise side portion including a portion defining a notch being recessed in a width direction orthogonal to the traveling direction, the notch being defined by less than an entire length, in the traveling direction, of the widthwise side portion, a contacting member arranged to be in contact with an end portion of a sheet to be conveyed, the contacting member being attached to the belt so that at least a part of the contacting member is arranged in the notch of the belt, a regulating portion configured to regulate a position of the belt in the width direction by contacting with the widthwise side portion of the belt, and a driving portion configured to drive the belt.

A sheet conveying apparatus with a belt having a cutaway portion at least at one end portion in a width direction orthogonal to a traveling direction and a thickness direction thereof, a claw member and a driving portion driving the belt. The claw member has a pinching portion configured to attach the claw member to the belt by pinching the belt.

An image forming apparatus includes: a cassette including a first and a second sheet storage areas, arranged side by side, each on which a sheet having a predetermined size is placeable; a sheet feeder configured to feed the sheet from the first area to an image forming portion; a first sheet sensor; a second sheet sensor; a movement member configured to move the sheet from the second area to the first area when no sheet placed on the first area is detected by the first sheet sensor and the sheet placed on the second area is detected by the second sheet sensor; and an annunciator configured to annunciate that a sheet having a size different from the predetermined size is placed on the cassette when the first sheet sensor does not detect the sheet after a completion of a movement of the sheet.