| 摘要 |
PURPOSE:To absorb the error in thickness of a member to be clamped and to execute the highly accurate positioning by positioning and fixing the member to be clamped with two reference surfaces and two plungers. CONSTITUTION:In order to replace a head base 10 positioned and fixed, a nut 32 is turned in a first direction, retreated sufficiently, plungers 18 and 20 are pushed out to the outside with the force of springs 24 and 26, the tip part of the plungers 18 and 20 is parted from a taper surface 10a and the thrust force to the taper surface 10a of the plungers 18 and 20 is made sufficiently weaker. Then, the head base 10 is moved horizontally in an escaping direction and removed. Next, when the head base 10 is fitted and clamped, in the clamping releasing condition, the bottom surface of the head base 10 is horizontally moved in an inserting direction while it slides to horizontal reference surfaces 12b and 12c, thereafter, the edge surface is thrust to a tip part 36 of a micrometer 34, the nut 32 is turned in a second direction, the plungers 18 and 20 at a non- reference side are sandwiched through a spring 34 and a pressing plate 30 and the head base 10 is fixed.
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