Rotary woodworking machine

摘要

A rotary woodworking machine includes a longitudinally extending transmitting shaft having two ends respectively coupled to two rotary woodworking members. A speed ratio varying device is disposed to couple the transmitting shaft to an output shaft of a motor, and includes two pitch-variable first and second pulleys mounted on the transmitting shaft and the output shaft, a belt trained on the pulleys, and a control unit operable to move a movable disc of the first pulley toward or away from a fixed disc of the first pulley so as to vary the radial distances between the belt and each of the shafts, thereby varying the speed ratio of the transmitting shaft to the output shaft.