送布牙平面调节（图 28）/ Feeding Tooth Plane Adjustment（Fig 28; 针距误差调节（图 29）/ Synchronous Feeding Adjustment（Fig29 - Jack H2 Series Product Instruction Manual

20.送布牙平面调节（图 28）/ Feeding tooth plane adjustment（Fig 28）
送布牙一般是水平位置。高于针板平面0.8～
1.2毫米。当缝制条件需倾斜时应调节。
a.旋松牙架曲柄轴螺钉（A）。
b.用螺钉起子压在牙架曲柄偏心轴的槽里,使
偏心轴左右转动。
c.最后将（A）螺钉拧紧。
送布牙前面高时，可防止布料起缩，不容易
出现空针。
送布牙前面低时，可防止布料跑偏，底线不
易断
The feed dog is generally horizontal. 0.8～
1.2mm above the plane of the needle board. It
should be adjusted when the sewing conditions need
to be inclined.
a. Loosen the crankshaft screw (A) of the tooth
frame.
b. Use a screwdriver to press in the groove of the eccentric shaft of the bracket crank to make the eccentric
shaft rotate left and right.
c. Finally tighten the (A) screw.
When the front of the feed dog is high, the fabric can be prevented from shrinking and shrinking, and empty
stitches are not easy to appear.
When the front of the feed dog is low, the fabric can be prevented from running off and the bottom thread is
not easy to break.
21.针距误差调节（图 29）/ Synchronous feeding adjustment（Fig29）
旋松螺钉（A）转动针距调节凸轮（B）
顺时针转：——顺缝针距变大。
倒缝针距变小。
逆时针距：——顺缝针距变大。
倒缝针距变小。
Loosen screw (A), and turn stitch length
adjusting cam (B).
Turn clockwise: forward sewing, stitch length
enlarged; reverse sewing, stitch length shorten.
Turn counter-clockwise: forward sewing stitch length
shorten; reverse sewing, stitch length enlarged.
标记
偏心轴标记位置
水平
正上方
正下方
13
28
送布牙
标准
前面上升最大
前面下降最大
29
顺
逆