| 摘要 |
PROBLEM TO BE SOLVED: To provide a medium winder and a medium unwinding method which enable a medium to be rewound in a good condition.SOLUTION: The medium winder includes: a winding roller; first and second rollers that guide the medium to the winding roller; a dancer roller provided movable upwardly and downwardly; a winding driver; a detector that detects the dancer roller; a dancer roller position recognition part 32 that recognizes the position of the dancer roller based on a detection result by the detector; and a winding drive controller that drives the winding driver. The winding drive controller, in an operation of unwinding the medium, moves the dancer roller up and down by reducing or increasing the unwinding velocity of the medium based on a position of the dancer roller. It is unnecessary to start or stop driving the winding driver. The winder can prevent the tension of the medium from changing significantly.SELECTED DRAWING: Figure 1 |
