| 摘要 |
A measuring apparatus (1) is provided which has two arms (8) connected to a protection casing (6) through fulcrums (9). Associated with the arms (8), externally of the casing (6), are feeler pins (10) adapted to come into contact with the workpieces (3) and, internally of the casing (6), sensors (11) for measuring the oscillations of the arms (8). Also provided are driving members adapted to exert at least one contact force and one release force tending to rotate the arms (8) in opposite directions and comprising at least one magnet (13) adjacent to the arms (8), magnetic locators (14) integral with the arms (8) and having active faces (14a) turned towards the magnet (13), and drive elements (15) adapted to selectively vary the magnet (13) polarities turned towards the magnetic locators (14).
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