A transport unit transports a transport medium after the transport medium is newly placed as an uppermost medium in a state in which one or a plurality of placed media are already placed in a processing tray. At this state, at least one of the placed media placed on the processing tray is pressed by a pressing unit at a pressing position. After the transport unit is separated away from the transport medium, the pressing unit can move from the pressing position to a retraction position.

A transport unit transports a transport medium after the transport medium is newly placed as an uppermost medium in a state in which one or a plurality of placed media are already placed in a processing tray. At this state, at least one of the placed media placed on the processing tray is pressed by a pressing unit at a pressing position. After the transport unit is separated away from the transport medium, the pressing unit can move from the pressing position to a retraction position.

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 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.

Disclosed are a carrier for sheet-like materials and a passivation device, solving a problems of low processing efficiency and poor consistency of processing effect of sheet-like materials. The carrier for the sheet-like materials includes a carrying assembly and at least one compressing assembly. The carrying assembly includes at least one first accommodating cavity. The first accommodating cavity includes a first opening. The first accommodating cavity is configured to accommodate a plurality of sheet-like materials stacked placed, and the sheet-like material enters and exits the first accommodating cavity from the first opening. The compressing assembly is connected to the carrying assembly and extends into each first accommodating cavity to compress the plurality of sheet-like materials in the first accommodating cavity.

Disclosed are a carrier for sheet-like materials and a passivation device, solving a problems of low processing efficiency and poor consistency of processing effect of sheet-like materials. The carrier for the sheet-like materials includes a carrying assembly and at least one compressing assembly. The carrying assembly includes at least one first accommodating cavity. The first accommodating cavity includes a first opening. The first accommodating cavity is configured to accommodate a plurality of sheet-like materials stacked placed, and the sheet-like material enters and exits the first accommodating cavity from the first opening. The compressing assembly is connected to the carrying assembly and extends into each first accommodating cavity to compress the plurality of sheet-like materials in the first accommodating cavity.

A positioning device (38) for holding a flat flexible part, especially a sheet, on a positioning surface is described. It comprises a body (44) with a fluid inlet port (52) for supplying a driver fluid to the body (44), a fluid outlet port (58) for draining the driver fluid from the body (44), and a suction opening for aspiring the flat flexible part. A circulation channel (60) connects the fluid inlet port (52) and the fluid outlet port (58) and a suction channel (70) connects the suction opening to the circulation channel (60). The suction channel (70) is connected to the circulation channel (60) adjacent to a section (64) of reduced cross section area such that a jet pump (71) is formed. Every cross section (S.sub.c) of the circulation channel (60) and/or every cross section (S.sub.s) of the suction channel (70) along its entire respective length have/has a smooth rim. Additionally, a positioning assembly comprising at least one such positioning device (38) is presented. Moreover, a sheet material processing machine is introduced which comprises at least one positioning assembly.

A positioning device (38) for holding a flat flexible part, especially a sheet, on a positioning surface is described. It comprises a body (44) with a fluid inlet port (52) for supplying a driver fluid to the body (44), a fluid outlet port (58) for draining the driver fluid from the body (44), and a suction opening for aspiring the flat flexible part. A circulation channel (60) connects the fluid inlet port (52) and the fluid outlet port (58) and a suction channel (70) connects the suction opening to the circulation channel (60). The suction channel (70) is connected to the circulation channel (60) adjacent to a section (64) of reduced cross section area such that a jet pump (71) is formed. Every cross section (S.sub.c) of the circulation channel (60) and/or every cross section (S.sub.s) of the suction channel (70) along its entire respective length have/has a smooth rim. Additionally, a positioning assembly comprising at least one such positioning device (38) is presented. Moreover, a sheet material processing machine is introduced which comprises at least one positioning assembly.

A post-processing apparatus includes a movable portion and an opposing portion that are arranged to be opposite to each other with a conveyance path through which a sheet is conveyed interposed between the movable portion and the opposing portion, and a restricting member that has a holding surface including an abutment surface against which a sheet abuts, is capable of changing a posture between a first posture in which the holding surface closes the conveyance path and a second posture in which a clearance is formed in at least part of the conveyance path and is attached to a side where the opposing portion is located with respect to the conveyance path, wherein the movable portion processes a sheet positioned at the abutment surface by the restricting member having the first posture by moving toward the opposing portion.

A post-processing apparatus includes a movable portion and an opposing portion that are arranged to be opposite to each other with a conveyance path through which a sheet is conveyed interposed between the movable portion and the opposing portion, and a restricting member that has a holding surface including an abutment surface against which a sheet abuts, is capable of changing a posture between a first posture in which the holding surface closes the conveyance path and a second posture in which a clearance is formed in at least part of the conveyance path and is attached to a side where the opposing portion is located with respect to the conveyance path, wherein the movable portion processes a sheet positioned at the abutment surface by the restricting member having the first posture by moving toward the opposing portion.