Patent ID: 8147023

Claim:
A printing apparatus comprising: a first motor configured to provide a drive force for rotating a roll member that is a wound medium; a second motor configured to provide a drive force for driving a transporting drive roller provided on a downstream side of the roll member along a feeding direction of the medium for transporting the medium; and a control unit configured to drive at least one of the first motor and the second motor to cancel a slackness of the medium generated between the roll member and the transporting drive roller; wherein the control unit controls the drive of the first motor so as to provide the drive force for causing the roll member to rotate in a direction opposite from the direction of rotation for transporting the medium in the feeding direction, determines whether or not the slackness of the medium is cancelled and, when it is determined that the slackness of the medium is cancelled, terminates the drive control of the first motor; and wherein the control unit determines whether or not the slackness of the medium is cancelled on the basis of a total value of control values outputted from a proportional element, an integral element, and a derivative element in PID control with respect to the first motor and a threshold value, which is a control value in the PID control when transporting the medium at a predetermined velocity in a state in which a predetermined tension is provided between the roll member and the transporting drive roller, compares the total value and the threshold value and, when the total value exceeds the threshold value, performs a correction to change the total value to the threshold value and controls the first motor.