Brother LK3-B448E - Manual (Page 45)

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10. Adjustments
LK3-B448E MARK II /BA-16
0.01 - 0.08mm
Tip
Needle center line
10-3 . Adjusting the driver needle guard
Turn the machine pulley to align the tip of the rotary hook with the needle center line. Then loosen the set screw
w
and turn the eccentric shaft e to adjust so that the driver needle guard q contacts the needle.
If the needle contact pressure is too great, skipped stitches may occur. On the other hand, if the driver needle guard
q is not touching the needle, the tip of the inner rotary hook will obstruct the needle, resulting in an excessively high
amount of friction.
10-4 . Adjusting the needle clearance
Turn the machine pulley to align the tip of the rotary hook with the needle center line. Then loosen the set screw q and
turn the eccentric shaft
w
to adjust so that the clearance between the needle and the rotary hook is 0.01 - 0.08 mm.
10-5 . Adjusting the shuttle race thread guide
Install the shuttle race thread guide
q
by pushing it in the direction of the arrow so that the needle groove is aligned
with the center of the needle plate hole.
NOTE:
If the shuttle race thread guide is in the wrong position, thread breakages, soiled thread or catching of the thread may occur.
w
e
w
q
e
r
q
q