| 摘要 |
A positioning and fixing device positions a work pallet in the vertical and horizontal directions relative to a base member via a ring member, and also restricts its rotation around the vertical axis. The base member has Z reference surfaces that can stop a lower end reference surface of the ring member and position it in the vertical direction, and a tapered male engagement portion whose horizontal cross section is formed as a regular polygon having a plurality of outwardly convex circular arcuate vertex portions and a plurality of side portions, and that reduces in diameter upwards. The ring member has a tapered female engagement portion that can engage with the tapered male engagement portion so that its lower end reference surface is in contact against the Z reference surfaces. A clamp mechanism for fixing the ring member to the base member is provided, and the side portions of at least one of the tapered female engagement portion and the tapered male engagement portion are adapted to engage in close contact with the other via elastic deformation.
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