In one example, a holder for a media roll includes a first support to support a first end of the roll, a second support to support a second end of the roll, and a shifter to change the distance between the first support and the first end of the roll without changing the distance between the second support and the second end of the roll.

An attachably/detachably sheet feeding unit includes a main body part, a pair of side cursors, a pair of cursor racks, a pinion and a holding member. On the main body part having a bottom plate, a sheet is placed. The side cursors are supported by the bottom plate to slide in a width direction of the sheet to restrict a position of the sheet in the width direction. The cursor racks respectively extend from the side cursors in opposing directions in the width direction. The pinion is engaged with the cursor racks. The holding member has a shaft support part rotatably supporting the pinion, is attachable/detachable to/from the bottom plate, and then, is supported to the bottom plate to move in the width direction while the pinion is engaged with the cursor racks, and is fixed to the bottom plate in an optional position in the width direction.

A sheet feeder includes a sheet placement unit to place a sheet, and an indicator indicating a predetermined position at which the sheet is to be set on the sheet placement unit. The indicator is movable between a first position at which the indicator is adjacent to or in contact with the sheet on the sheet placement unit and a second position farther than the first position from the sheet placement unit.

A method for unwinding includes loading a first reel of web material into a first unwind position where the web is unwound. A splicing unit is then moved in the machine direction toward the first unwind position until there is sufficient space to allow a further reel to be loaded into a second unwind position where the web from the second reel is unwound once loaded. Then, the web from the first reel is spliced to the second reel, and the web of the first reel is thereafter cut. The process continues in the opposite direction after removing the first reel from the first unwind position. The web of the second reel is unwound in the second position, the splicing unit is moved toward the second unwind position until there is sufficient space to allow a further reel to be loaded into the first unwind position.

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.