PURPOSE: To quickly damp the amplitude and vibration of a type wheel within an allowable hunting with after selection thereof by a method in which a conductive disc is provided to the drive shaft of the type wheel, and an electromagnet is provided to the disc.

CONSTITUTION: A conductive disc 6 is integrally attached to the drive shaft 2 between a type wheel 1 and a motor 5, and an electromagnet 7 is provided to the disc 6 so that the magnetic flux is directed to right angle to the disc 6. When the disc 6 turns, eddy current is generated in the opposite direction to the electromagnetic direction of the electromagnet 7 to serve as a braking action, whereby quickly damping the hunting action of the type wheel 1. Therefore, the time lag in the selection of type on the type wheel 1 and the stop position of type selected can be shortened. The speed-up of the printing performance of printer and the enhancement of printing alignment can thus be realized.