Needle Bar Mechanism - Brother LK3-B430E Mark II Service Manual

5-8. Needle bar mechanism

During assembly, apply grease to the portions indicated by the white arrows.
t
!7
!6
e
r
!2
i
o
Set screw
Set screw
1. Temporarily tighten the screw w of the needle bar guide q.
2. Pass the thread take-up support stud e through the thread take-up assembly r, lightly press the former,
and secure them using the set screw t.
3. Pass the needle bar crank y through the thread take-up assembly r and the counter crank u, adjust the
set screw i to the screw flat, and tighten the set screws i and o.
4. Fit the chamfering side of the needle bar guide slide block !0 into the groove on the needle bar guide q,
and insert the shafts of the needle bar clamp !1 dinto the thread take-up lever !2 and the needle bar guide
slide block !0 , as shown in the figure.
* Be sure to apply grease to the sliding block !0 and the groove of the needle bar guide q.
5. Insert the needle bar !3 from the top of the machine into the needle bar clamp !1 .
6. Turn the pulley to set the needle bar !3 at its lowest position. Move the needle bar vertically so as to align
the second lowest reference line A (for using needle DP × 17) or the highest reference line a (for using
needle DP × 5) on the needle bar !3 with the lower end of needle bar bush (D) !4 . Tighten the screw !5 with
the cut section of the needle bar facing the front.
7. Find the position of the needle bar guide q so that the pulley rotates easily, and tighten the screw w.
8. Attach the oil cap ! 6 and the rubber caps ! 7 , ! 8 , and ! 9 .
9. Insert the wick @0 extending from the thread take-up support stud e into the lubrication hole @1 .
@0
@1
u
!2
!9
w
q
y
!3
u
a
(DP × 5)
!0
!1
!4
A
!3
DP × 17
Cut section
LK3-B430E Mark II
!3
!5
!1
q
5. ASSEMBLY
!8
!4
34