| 摘要 |
PURPOSE:To attain cost reduction, by constituting a means for detecting the position of a measuring contact probe to a reference contact probe from an inexpensive magnetic proximity sensor. CONSTITUTION:The titled apparatus has a reference surface contact probe 20 contacted with the reference surface 21a of an article 21 to be measured, a measuring contact probe 25 movable in parallel to said contact probe 20 and contacted with the measuring surface 21b of the article 21 to be measured and a means for detecting the position of a contact probe 25 to the contact probe 20. An iron piece 27 being a magnetic body is mounted to the upper end of a slide plate 24 while a magnetic approximate sensor for detecting the iron piece 27 is provided to a holder 16 through a small bracket. When the holder 16 is lowered, the contact probe 25 is contacted with the measuring surface 21b and the contact probe 20 is subsequently contacted with the reference surface 21a. At the point of time when the contact probe 25 was contacted with the reference surface 21b, the downward movement of the slide plate 24 taking charge of the contact probe 25 is controlled. By this method, the iron piece 27 is upwardly moved with respect to the magnetic proximity sensor and the movement quantity thereof is detected by the magnetic proximity sensor and, therefore, the acceptance of the distance between surfaces can be judged.
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