Two, feeding mechanism: feeding mechanism is to rely on a pair of or two of the feed wheel to press the wire, in order to feed wheel rotation to drive the wire straight ahead of the device.
送料机构：送料机构是靠一对或两对送料轮压紧钢丝，以送料轮的旋转带动钢丝直线前进的装置。
The arch feed was replaced with bowstring feed in spatial arch interpolate, or circular arc was replaced with spatial straight line.
空间圆弧粗插补用弦进给代替弧进给，即用空间直线代替圆弧。
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