Patent ID: 9108257
Filing Date: 2015-08-18
Classification: B23F,Y10T

Abstract:
1. A gear shaping machine configured to manufacture a gear through generating cutting of external teeth and internal teeth in a workpiece by means of a pinion cutter, the gear shaping machine comprising: a main spindle, to a distal end of which the pinion cutter is attached; a cutter head on which the main spindle is rotatably and vertically movably supported with a distal side of the main spindle projected from a distal side of the cutter head, and which is pivotally supported at a proximal side thereof; rotationally driving means for rotationally driving the main spindle; vertically moving means for vertically moving the main spindle; and relieving means for, during downward movement of the main spindle, swinging the distal side of the cutter head in such a way that the pinion cutter is located at a machining position at which the pinion cutter contacts the workpiece, and moving the pinion cutter straightly downward, and, during upward movement of the main spindle, swinging the distal side of the cutter head in such a way that the pinion cutter is located at a relieved position away from the workpiece, and moving the pinion cutter straightly upward, wherein the relieving means switches a cycle of the vertical movement of the pinion cutter and an inclination angle of a path of the movement of the pinion cutter with respect to an axis of the workpiece in such a way that, in a case of generating cutting of external teeth in the workpiece, the machining position is located at one side in a radial direction of the pinion cutter and the pinion cutter is moved downward in parallel with the axis of the workpiece, and, in a case of generating cutting of internal teeth in the workpiece, the machining position is located at the other side in the radial direction of the pinion cutter and the pinion cutter is moved downward in parallel with the axis of the workpiece, the relieving means includes the swing unit includes