| 摘要 |
PROBLEM TO BE SOLVED: To press the inner circumferential face receiving a shaft bar in the prescribed direction against the outer circumferential face of a rotary shaft to enable a table to be correctly positioned even when the table is on any rotational position by providing a pressing means pressing the table in the prescribed direction perpendicular to the shaft bar. SOLUTION: A pressing means 6 is in parallel with the direction of rectilinear driving force given to a table 1 by a driving means 5, and connected to a position so as to be symmetric with the driving means 5 about a plane containing a shaft bar 3. This pressing means 6 consists of an air cylinder making negative pressure therein, and it always presses the table 1 by larger force than that of the rectilinear driving means 5 in Y-direction. Hereat, the sectional form of a shaft bar receiver 2 is formed into a nearly key-hole-like shape projecting one part of the circumference in a square, and the inner circumferential face of the bearing 2 is pressed by the pressing force of the pressing means 6 while two-points-contacting with the shaft bar 3.
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