| 摘要 |
PURPOSE:To widen the range of photo-microswitch where it is to be changed from the ''false'' level to the ''true'' level by managing the truth/false level of the photo-microswitch, an exciting phase of a step motor and a track number. CONSTITUTION:A control circuit 16 drives the step motor at the initializing and detects the track 00. When the photo-microswitch is in the true state at the initializing, it is impossible to distinct the track 00 from the track 2. it is possible to distinct the track 00 from the track 2 by driving the step motor by one phase's share in opposite direction to the track 00 so as to confirm that the photo-microswitch is changed from the true into the false state. Thus, it is not necessary to detect the track 00 at [2], [3], and [4] by managing the track, allowing to detect in a wide range such as [2], [3], [4] and [5]. |
