Patent ID: 8913947

Claim:
A sheet supply device that is addable to a medium processing device and that is configured to supply media to the medium processing device, the sheet supply device comprising: a storage part that stores a first medium; a sheet supply part that supplies the first medium from the storage part; a sheet carrying path through which a second medium is carried from an upstream side of a medium path; a carrying part that carries the first medium and the second medium to a downstream side of the medium path; a drive source that provides a drive force to each of the sheet supply part and the carrying part; a carrying transmission member that selectively transmits the drive force to the carrying part; a transmission mechanism that transmits the drive force to the carrying part without transmitting the drive force via the carrying transmission member; and a controller that operates the drive source and the carrying transmission member, wherein the controller performs a first operation in which the first medium is supplied from the storage part of the sheet supply device, and a second operation in which the second medium supplied from the upstream side is carried to the downstream side, and when the second operation is performed, the controller operates the carrying part by transmitting the drive force to the carrying part via the transmission mechanism without operating the carrying transmission member.