Cutting tip, cutting tool and gear edge cut-off device

A cutting tip having a cutting blade that advances and retracts between adjacent teeth of a gear in a direction of a tooth width, and is contacted in an obliquely crossing state to side edges of the teeth as viewed in a direction of a tooth thickness, wherein relative movement in the direction of the tooth thickness causes retraction from between the teeth while the side edges are cut off,

• the cutting tip comprising:
• a shaft portion supported linearly movably and forwardly biased in a linearly moving direction;
• an angular base portion provided at a front end of the shaft portion and having a pair of skirt faces that are mutually separated toward a rear and a ridge portion that extends obliquely with respect to the linearly moving direction;
• a groove depressed near the ridge portion of the skirt face and extending substantially parallel to the ridge portion;
• a blade edge provided on the cutting blade and positioned on a border line between the ridge portion and the groove;
• a rake face provided on the cutting blade and positioned further toward the groove side than the blade edge;
• and
• a flank face provided on the cutting blade and positioned further toward the ridge portion side than the blade edge, that juts out forward as it separates from the blade edge.