Gear chamfering device and gear processing machine equipped with said gear chamfering device

A gear chamfering device comprising:

• a gear chamfering tool which chamfers a tooth profile ridge section of a gear to be cut by cutting;
• a tool holding part which holds the gear chamfering tool in one end portion thereof;
• a main body part which includes the tool holding part;
• substantially linear movement means which includes a restricting part in which one end portion thereof is rotatably supported on the main body part and other end portion thereof is rotatably coupled to other end portion of the tool holding part, the other end portion of the tool holding part being opposite to the one end portion which holds the gear chamfering tool, thereby causing the other end portion of the tool holding part to make a reciprocating movement drawing substantially linear trajectory about the one end portion of the restricting part;
• and
• circular movement means for causing an intermediate portion of the tool holding part to make a circular movement, the intermediate portion provided between the one end portion which holds the gear chamfering tool and the other end portion which is caused to make the reciprocating movement by the substantially linear movement means, wherein
• a tip end part of the gear chamfering tool is caused to make a substantially elliptical movement so as to pass an entrance position where at least part of the gear chamfering tool enters a portion between tooth surfaces of the gear to be cut and an exit position where the gear chamfering tool exits from the portion between the tooth surfaces of the gear to be cut, by combining the substantially linear movement means and the circular movement means, and
• the gear to be cut is rotated while the tip end part of the chamfering tool is located between the exit position and the entrance position.