| 摘要 |
PROBLEM TO BE SOLVED: To achieve the setting and detection of an arbitrary position in the stroke of a nut by directly using the rotation of a ball screw on its axis, and specifically, by using its rotating shaft and accessories. SOLUTION: This mechanism is used to detect an rotation angle which is not greater than N turns of the rotating shaft having an N turn stroke and made up of a first gear 3 rotating around the rotary shaft 1 of an object of detection and a second gear 4 meshing therewith to rotate on its axis 2 of rotation. The gear ratio of the gear 3 to the gear 4 is (N±1):N. Marks 5, 6 are provided near the tooth parts of the gears 3, 4, respectively, and a position at which the two marks 5, 6 coincide on a straight line joining the shaft 1 to the axis 2 is taken as the, and as the shaft 1 of the object rotates, the gear 3 is rotated from the start point and accordingly the gear 4 is rotated, then the marks 5, 6 come to re-coincide on the line as the principle. An observation point 7 for observing the marks 5, 6 re-coinciding the line is provided on the gear 4 on the line connecting the shaft 1 and the axis 2. A reference point 8 is provided near the tooth part of the gear 4, and the mark 6 can be set displaceably at a position displaced from the point 8 by an arbitrary angle of rotation.
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