A transport device includes a first driving roller configured to contact an outer circumferential surface of a roll body on which a medium is wound, and apply rotational torque to the roll body, a second driving roller configured to unwind the medium from the roll body, a first drive unit configured to drive the first driving roller, a second drive unit configured to drive the second driving roller, and a control unit configured to control the first drive unit and the second drive unit. The control unit controls the first drive unit, based on a magnitude of a load current flowing in the second drive unit.

A machine includes multiple types of paper sheet handling units, each of which includes a conveying mechanism for conveying a banknote and performs a different handling process on the banknote; and a controller that controls the paper sheet handling units. Each of the paper sheet handling units includes a connecting portion that connects conveying paths of the conveying mechanisms, and the connecting portions are provided in common positions among the paper sheet handling units. The controller detects types of the paper sheet handling units and relative positions of the paper sheet handling units in a conveying pathway of the banknote, with respect to the paper sheet handling units that are connected via the connecting portions, and controls each of the paper sheet handling units based on the type and the relative position.

A medium transport device includes: a feeding roller that feeds a medium mounted on a medium mounting section; a separation roller that nips the medium with the feeding roller to separate the medium and is configured to rotate in a first rotation direction in which the medium is transported downstream and a second rotation direction that is opposite to the first rotation direction; a pressing member that presses the separation roller against the feeding roller; a pressing force change portion that changes a pressing force of the pressing member; and a single drive source that generates a driving force for the separation roller and a driving force for the pressing force change portion.

A machine includes multiple types of paper sheet handling units, each of which includes a conveying mechanism for conveying a banknote and performs a different handling process on the banknote; and a controller that controls the paper sheet handling units. Each of the paper sheet handling units includes a connecting portion that connects conveying paths of the conveying mechanisms, and the connecting portions are provided in common positions among the paper sheet handling units. The controller detects types of the paper sheet handling units and relative positions of the paper sheet handling units in a conveying pathway of the banknote, with respect to the paper sheet handling units that are connected via the connecting portions, and controls each of the paper sheet handling units based on the type and the relative position.

A sheet conveying system includes: an upstream apparatus provided on an upstream side in a conveyance direction of a paper sheet; a downstream apparatus provided on a downstream side of the upstream apparatus; an upstream conveyor that conveys the paper sheet; an upstream driver that drives the upstream conveyor; a downstream conveyor that receives the paper sheet conveyed from the upstream conveyor, and conveys the paper sheet received from the upstream conveyor; a downstream driver that drives the downstream conveyor; an upstream controller that is connected to the upstream and downstream drivers; and a downstream controller that is connected to the downstream and upstream drivers, wherein the sheet conveying system switches control on the basis of sheet information between first control in which the upstream controller controls the upstream and downstream drivers and second control in which the downstream controller controls the downstream and upstream drivers.

A sheet conveying system includes: an upstream apparatus provided on an upstream side in a conveyance direction of a paper sheet; a downstream apparatus provided on a downstream side of the upstream apparatus; an upstream conveyor that conveys the paper sheet; an upstream driver that drives the upstream conveyor; a downstream conveyor that receives the paper sheet conveyed from the upstream conveyor, and conveys the paper sheet received from the upstream conveyor; a downstream driver that drives the downstream conveyor; an upstream controller that is connected to the upstream and downstream drivers; and a downstream controller that is connected to the downstream and upstream drivers, wherein the sheet conveying system switches control on the basis of sheet information between first control in which the upstream controller controls the upstream and downstream drivers and second control in which the downstream controller controls the downstream and upstream drivers.

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 medium transport device includes: a feeding roller that feeds a medium mounted on a medium mounting section; a separation roller that nips the medium with the feeding roller to separate the medium and is configured to rotate in a first rotation direction in which the medium is transported downstream and a second rotation direction that is opposite to the first rotation direction; a pressing member that presses the separation roller against the feeding roller; a pressing force change portion that changes a pressing force of the pressing member; and a single drive source that generates a driving force for the separation roller and a driving force for the pressing force change portion.