| 摘要 |
A stepping motor having a rotary shaft carrying a rotor, a stator, a housing encasing the rotor and a part of the rotary shaft and supporting the stator, and a signal system comprising a signal member provided on the rotary shaft and a sensor so disposed on the housing as to detect the passage of the signal member to produce a signal each revolution of the rotary shaft. The signal member can be a radially extending lug on the rotary shaft or a disc on the rotary shaft with a hole through the disc. The particular use is to detect the rotated position of a slot machine reel that has a series of various symbols on its periphery and is mounted on and rotated by the shaft; and for this purpose, the free end of the shaft and the reel mounted thereon have non-circular interengaging structure that accurately predetermines the relative positions of the signal member and the various symbols on the reel.
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