Adjusting The Triming Of The Thread Trimming (B856E) - Brother LZ2-B855E Service Manual

6. ADJUSTMENTS
6-18. Adjusting the timing of the thread trimming (B856E)
The knife unit q should already be installed in the correct way when the following adjustments are carried out.
q
0.5mm
A
i
T
6-15
<Horizontal position adjustment>
1035S
w
1. Tilt back the machine head.
2. Loosen the two screws w.
3. Move the stopper r to adjust so that the edge of the
4. Securely tighten the screws w.
5. Loosen the two set screws t and the two set screws
6. While pushing the thread trimming driving rod u by
7. Provisionally tighten the two set screws t.
8. Place the set screw collar !1 firmly against the thread trim-
r
t
! 1
y
! 0
o
u
1036S
<Rotating direction adjustment>
1037S
1. While still pushing thread trimming driving rod u by
U
! 2
2. Securely tighten the two set screws t.
3. While still pushing thread trimming driving rod u by
t
! 0
u
1038S
LZ2-B855E,B856E
movable knife e is 0.5 mm inside the edge of the knife
unit q.
y.
hand, adjust the horizontal position of the thread trim-
ming cam !0 so that the roller o of the main lever i
moves smoothly in and out of the straight section A of
the groove in the thread trimming cam !0 .
ming cam ! 0 , and then securely tighten the two set screws
y.
hand, turn the machine pulley slowly by hand toward
you until the reference line on the thread take-up lever
!2 is aligned with the T mark on the face plate. Adjust
the position of the thread trimming cam !0 so that the
knife begins to move at this point.
* At this time, be careful to turn the machine pulley
so that the thread trimmer cam ! 0 does not sepa-
rate from the set collar !1 .
hand, turn the machine pulley slowly by hand toward
you until the reference line on the thread take-up lever
is aligned with the T mark on the face plate. Check that
the knife begins to move at this point, and that it re-
turns when the reference line is aligned with the U
mark.