TIP HOLDER AND TIP HOLDER ATTACHMENT STRUCTURE

摘要

PROBLEM TO BE SOLVED: To eliminate complicatedness of tip attachment and tip replacement work and allow replacement with an appropriate tip without mistakes.SOLUTION: A tip holder 60A comprises: a tip 14 attached to one end in a freely rotatable way; a dent 62 formed in a toric form throughout the outer peripheral surface; and an operation bar 61A protruding from a side surface. The tip holder 60A is inserted into a holding hole 72A while the operation bar 61A is introduced into a bar introduction groove 71A of a holder attachment part 70A. When the operation bar 61A is pulled up to the uppermost part of the bar introduction groove 71A, the dent 62 of the tip holder 60A is engaged in an elastic member 73 of the holding hole 72A, and the tip holder 60A is fixed to the holder attachment part 70A. Since the movement of the rotational direction of the operation bar 61A is restricted in the bar introduction groove 71A, the tip holder 60A is positioned accurately within the holding hole 72A of the holder attachment part 70A.