Upper Shaft Mechanism - Brother LK3-B430E Mark II Service Manual

5. ASSEMBLY

5-7. Upper shaft mechanism

During assembly, apply grease to the portions indicated by the white arrows.
r
i
Rotation direction
Pulley
1. Insert the upper shaft q from the rear of the machine, and place the thread trimmer cam w, the bobbin
winder pulley e and the washer r on the shaft.
* Apply adhesive (equivalent of Three Bond 1401) around the area which the bearing in the machine goes
into. Also, apply grease to grooves on the thread trimmer cam w.
2. Pass the thread take-up crank t from the face plate side over the upper shaft q, and tighten the screw y
and the set screw u.
3. Bring the thread take-up crank t, the washer r and the bobbin winder pulley e close to the upper shaft
bush so that there is no end play in the upper shaft q. Secure the bobbin winder pulley e by adjusting the
set screw to its screw flat and tightening it.
4. Press the thread trimmer cam w against the crank of the upper shaft q. Adjust the set screw o that comes
first when rotating to the screw flat, and tighten it.
5. Attach the synchronizer ! 0 to the machine using the screw ! 1 .
6. Attach the pulley !2 leaving a 0.5 mm clearance from the protrusion of the synchronizer !0 , tighten the set
screw ! 3 that comes later when rotating to the screw flat.
33
q
e
!0
!1
!3
Rotation direction
!3
!2
Thread trimmer cam
w
y
!2
o
q
w
LK3-B430E Mark II
r
e
t
y
u
0.5 mm
!0
q
u
t
!2