| 摘要 |
PURPOSE:To perform position detection without requiring any high-precision device specially by setting a speed variation ratio within the operation range of one stroke of the rotary driving system so that absolute positions detected by a position detector are all different. CONSTITUTION:Gears 14 and 15 having a speed variation ratio N:N+alpha are mounted on the rotating shaft of the rotary driving system 11 and an absolute position detector 12 drives a rotation signal generator 13 which generates on pulse on every turn. When the detector 12 rotates by (n) cycles, the speed variation is so set that the generator 13 rotates by n(1+alpha/N) cycles and every stroke of the rotary driving system 11 is different, and consequently the one-cycle signal of the generator 13 is different from the detection signal of the detector 12. Therefore, the absolute position is detected without requiring any special high- precision constitution.
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