| 摘要 |
PROBLEM TO BE SOLVED: To precisely measure an angle in the case of drafting by mounting a stress detecting means at a base member rotatable to a reference point, and calculating a rotating angle of the member from a detected value of a Coriolis force generated in the case of rotating the member to the point and a time of rotating the member. SOLUTION: In the case of drafting a line formed at an angle to a line as a reference, the line becoming the reference line is matched to a line formed with a scale 2 of a scale body 1, and reset button 5 is pressed. Thus, a potential obtained from an AC power source in a detecting calculator 3 and deviated byπout of phase from a predetermined frequency is given to a piezoelectric element 22 for driving a gyroscope 20 provided in the calculator 3. When the drafting machine 10 is rotated in this state, a Coriolis force is generated at a vibrator 21 after an infinitesimal time is elapsed, and a strain is generated in a y-axis direction at the vibrator 21. This strain is detected by a piezoelectric element 23a for detecting to obtain an amplitude of the Coriolis force, an angular velocity is calculated from the force, the rotary angle of the machine 10 is calculated, and displayed on a display means.
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