| 摘要 |
PROBLEM TO BE SOLVED: To provide an instrument for measuring shapes of spectacle frames that can accurately measure the vertical displacement of the spectacle frames by preventing a probe from falling off from a frame groove, deformation of rims, and so on. SOLUTION: A stylus 37, which moves along the frame groove 36 formed on the inner peripheral surface of the rims 35A (35B) of the spectacle frame is held in a vertically movable state by means of a Z-direction holding mechanism 66. The holding mechanism 66 is constituted of a vertically movable rod 65, fitted with the stylus 37 at its upper end and a balance spring 80, which holds the rod 65 at a prescribed height position by pushing up the rod 65 at measuring of the shape of the spectacles frame. Usually, the rod 65 is locked downward by means of a turning lever 92 of a backspace mechanism 67 and, at measuring time, the rod 65 is unlocked by raising and turning the turning lever 92 by means of an actuator 90. Consequently, the rod 65 is raised by means of the balance spring 80, and the stylus 37 is moved from a saved position T to a loading position Rd. COPYRIGHT: (C)2004,JPO
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