Upper Shaft Mechanism - Brother BAS-311E Service Manual

6. Upper shaft mechanism

1. Insert the upper shaft q from the rear of the machine, and place the thread trimmer cam w and the stepping work
clamp connecting rod e 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 r from the face plate side over the upper shaft q, and tighten the screw t and the set
screw y.
3. Place the upper shaft bush between the thread take-up crank r and the stepping work clamp connecting rod e, and
secure the upper shaft q so that there is no looseness. (At this time, do not securely tighten the set screw of the
stepping work clamp conncting rod e.)
4. Press the thread trimmer conncting rod w against the crank of the upper shaft q. Adjust the set screw u that comes
first when rotating to the screw flat, and tighten it.
5. Attach they synchronizer i to the machine using the screw o.
6. Attach the pulley !0 leaving a 0.5 mm clearance from the protrusion of the synchronizer i, tighten the set screw !1 that
comes later when rotating to the screw flat.
q
e
i
o
!1
!1
!0
BAS-311E.311EL.326E.326EL
w
t
r
!0
y
u
q
w
i
Chapter 3. Assembly
q
e
y
t
q
r
0.5mm
!0
39