| 摘要 |
The pick feed direction is determined by a feed direction signal produced as the result of a phase direction circuit. The direction is received from an input unit, and the pick feed is effected by a contour trace. The feed direction signal indicates whether the direction of tangential velocity is to be ±90 with respect to the normal state. A velocity arithmetic circuit inverts the polarity of its output; a tangential direction velocity signal is created, depending on the binary value of the feed direction signal.
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