Patent ID: 8573730

Claim:
A transport device that transports a long medium so as to send the medium downstream in a transport direction by rotating a shaft member on which the long medium is wound in a roll form, the transport device comprising: a sending roller that is disposed further downstream in the transport direction than a housing section where the medium wound in a roll form on the shaft member is housed, the sending roller feeding the medium downstream in the transport direction; a driving section that generates driving force for rotating the shaft member and the sending roller; a detection section that detects a deflection amount of the medium between the shaft member and the sending roller in the transport direction; and a control section that controls, when transporting the medium downstream in the transport direction, the driving section such that the deflection amount of the medium detected by the detection section becomes equal to or greater than a predetermined reference amount, wherein when the driving section is driven so as to transport the medium downstream in the transport direction, the control section performs prescribed processing that is different from when the deflection amount becomes equal to or greater than the predetermined reference amount when the deflection amount of the medium detected by the detection section does not become equal to or greater than the predetermined reference amount, wherein the driving section can generate a first driving force that rotates the sending roller and the shaft member in a first rotational direction so as to transport the medium downstream in the transport direction and a second driving force that rotates the sending roller and the shaft member in a second rotational direction that is a direction opposite to the first rotational direction, so as to wind the medium on the shaft member, and wherein the control section: when winding the medium on the shaft member, the control section controls the driving section such that the deflection amount of the medium detected by the detection section becomes equal to or less than the predetermined reference amount, and while the driving section is driven so as to wind the medium on the shaft member, if the deflection amount of the medium does not become equal to or greater than the reference amount, the control section performs a prescribed processing is performed which is different from when the deflection amount becomes equal to or less than the predetermined reference amount, when the deflection amount of the medium detected by the detection section continues for a predetermined period of time while the shaft member is rotated in the second direction, the control section determines that the remaining amount of medium on the roll has become low.