Paper winder and paper winding method

A paper winder that winds a paper, the paper winder comprising:

• a first winding core that is provided in a first arm turning centering on a rotating shaft and on which the paper should be wound;
• a first motor that drives the first winding core;
• a second winding core that is provided in a second arm turning centering on the rotating shaft and on which the paper should be wound next to the first winding core;
• a second motor that drives the second winding core;
• and
• a controller that performs rotation control for the first motor and the second motor, wherein
• the controller is configured to, in the rotation control, after completion of the winding of the paper by the first winding core and after, according to the turning of the second arm, a position of the second winding core has reached a position where the paper should be wound, during an operation of a traverse cutter that cuts the paper near the second winding core, when a torque value of the second motor is equal to or larger than a torque reference value, switch a control mode of the second motor from speed control to torque control and perform tension correction control for adjusting the torque value of the second motor such that tension of the paper falls within a target range.