Personnel saving of a process from a printer to a sheet processing machine is achieved. A general printing management device is connected to be communicable with a conveyance management device that manages a plurality of automatic guided vehicles each conveying a stacker in which paper ejected from a printer is stackable. The general printing management device generates conveyance instruction information for conveying a stacker in which paper ejected from the printer is stacked from a sheet receiving position of the printer to a sheet supply position of a next processing machine, based on job information in which a manufacturing process procedure for manufacturing a printed product is registered, and transmits the conveyance instruction information to the conveyance management device.

Personnel saving of a process from a printer to a sheet processing machine is achieved. A general printing management device is connected to be communicable with a conveyance management device that manages a plurality of automatic guided vehicles each conveying a stacker in which paper ejected from a printer is stackable. The general printing management device generates conveyance instruction information for conveying a stacker in which paper ejected from the printer is stacked from a sheet receiving position of the printer to a sheet supply position of a next processing machine, based on job information in which a manufacturing process procedure for manufacturing a printed product is registered, and transmits the conveyance instruction information to the conveyance management device.

A sheet stacking device includes: a mounting table on which a pallet is mounted, the mounting table having a lift; a sensor including: light emitters and light receivers each arranged in the lateral direction of the sheet stacking device so as to face with each other, the sensor to detect at least one of an upper surface of sheets stacked on the pallet or an upper surface of the pallet; and circuitry configured to cause the lift to lower the mounting table by a predetermined amount in response to the sensor detecting the at least one of the upper surface of the sheets or the upper surface of the pallet, and to determine that the sheets have been stacked abnormally when the sensor is not in a non-detection state after the mounting table has been lowered by the predetermined amount.

A sheet stacking device includes: a mounting table on which a pallet is mounted, the mounting table having a lift; a sensor including: light emitters and light receivers each arranged in the lateral direction of the sheet stacking device so as to face with each other, the sensor to detect at least one of an upper surface of sheets stacked on the pallet or an upper surface of the pallet; and circuitry configured to cause the lift to lower the mounting table by a predetermined amount in response to the sensor detecting the at least one of the upper surface of the sheets or the upper surface of the pallet, and to determine that the sheets have been stacked abnormally when the sensor is not in a non-detection state after the mounting table has been lowered by the predetermined amount.

A media conveying apparatus includes a media table on which media are to be placed, a conveyor, an ejector, an ejection table, and circuitry. The conveyor conveys the media placed on the media table. The ejector ejects the media conveyed by the conveyor. The ejection table is movable and disposed above the media table to stack the media ejected by the ejector. The circuitry controls the ejection table to be lowered based on an amount of media stacked on the ejection table while the media on the media table are sequentially conveyed. The circuitry controls the ejection table to be raised in response to completion of conveyance of all the media on the media table.

A media conveying apparatus includes a media table on which media are to be placed, a conveyor, an ejector, an ejection table, and circuitry. The conveyor conveys the media placed on the media table. The ejector ejects the media conveyed by the conveyor. The ejection table is movable and disposed above the media table to stack the media ejected by the ejector. The circuitry controls the ejection table to be lowered based on an amount of media stacked on the ejection table while the media on the media table are sequentially conveyed. The circuitry controls the ejection table to be raised in response to completion of conveyance of all the media on the media table.