PURPOSE: To improve processing capacity by carrying in the unprocessed workpiece, carrying out the completed workpiece, and carrying out, turning over, conveying, carrying in for the second time intermediate workpiece rationally during the one synchronized parallel motion of a carriage.

CONSTITUTION: The guides 50W53 for carrying in the unprocessed workpiece 13A, carrying out of the processed workpiece 13C, and carrying out, turning over, conveying, and the second carrying in of the intermediate workpiece 13B are all gathered on a carriage 42, and the carrying in of the unprocessed or intermediate workpiece and the carrying out of the intermediate or processed workpiece is done by each of the carrying in or out member 71, 72. Furthermore, the intermediate workpiece is turned over or conveyed by a pair of the turning over guides 52, 53 which revolve around the shaft center and are provided at the corresponding positions in front of and at the back of the intermediate workpiece, and the workpiece is carried in or out or turned over during one synchronized parallel motion of a carriage.