Making use of over-thread bar to make the adjustment
Loose set, adjusting over-thread bar, moving the bar forward or backward,
to adjust the loop smaller or larger.
过线球连杆: Bobbin connecting rod,紧定螺钉: Set screw,前: Front ,后: back
图11 (Figure11)
9、送布牙高度的调整（Adjustment of the feed dog height）
调整送布牙高度，牙齿来到最高点时，松开螺钉2，将主送布牙高度调整刀1.2mm，
然后拧紧螺钉2，同理松开螺钉1，将差动送布牙的高度调整到1.2mm，然后拧
紧螺钉1。
Adjust the feed dog height, when teeth reach to the height peak, loosen
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