PROBLEM TO BE SOLVED: To enable the needle part at a piercing needle to be guided in advancing straight toward a fastener regardless of the diameter of the needle part. ;SOLUTION: A pair of guide arms 10, 10 are projected forward from the periphery of a head storing part in which the head of a piercing needle is freely movably stored, and the needle part 13b of the piercing needle is held on the axis of the head storing part by the ends of the guide arms 10, 10 and is guided in advancing. Opposite V-shaped notches 10a, 10a are formed at the ends of the guide arms 10, 10, with the V-shaped inclined faces of the notches 10a, 10a made to abut to the peripheral surface of the needle part 13b.;COPYRIGHT: (C)1999,JPO
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