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When looper moving from right at needle middle, adjusting the distance of
looper and needle to be 0-0.05 mm(Picture 9), and looper continue to
moving towards left, when is arrive the middle of left needle, the distance
of looper and left needle is 0.05-0.1mm(picture 9) .
图9 Picure 9
7、后护针的调节
针杆在最低点时，调整后护针，使护针在右针孔上方1/3处,
弯针先端最右位置开
始到右针中心时>右针和弯针的先端前后间隙为0-0.05mm（图10）
7、 Adjusting rear guard needle
When the needle bar is at the lowest point, adjusting the rear guard needle
to make it on 1/3 of the right needle hole, the right end of looper to the
middle of right needle>the front and rear clearance of the right needle and
loopeer is 0-0.05mm (Figure 10).
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