Pedal sensor is designed for speed adjustment and synchronizer is designed for needle positioning.
同时设计脚踏板调速器实现调速功能，并设计机头定位器实现上下停针功能。
Pedal sensor is designed for speed adjustment and synchronizer using magnetic sensors is designed for needle positioning.
同时设计脚踏板调速器实现调速功能，并设计基于磁性传感器的机头定位器实现上下停针功能。
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