Feeding device and feeding method, and image forming device

A paper transporting apparatus transporting continuous paper to a paper processing part that performs designated processing on the continuous paper includes a drive roller that transports the continuous paper in a forward direction with respect to the paper processing part and a direction opposite to the forward direction by a frictional force, a pre-centering mechanism, disposed upstream of the drive roller with respect to the forward direction, that regulates a position of the continuous paper with respect to the forward direction and a direction orthogonal to the forward direction by abutting against the continuous paper, and a tension increasing mechanism, disposed upstream of the pre-centering mechanism with respect to the forward direction, that increases tension on the continuous paper.