Adjusting The Needle And Feed Mechanism Timing - Brother LZ2-B855E Service Manual

6. ADJUSTMENTS
u
o

6-7. Adjusting the needle and feed mechanism timing

q
w
6-05
2
i
1012S
1013S
B
C
r
e
0600M
<Backtacking and condensed stitches>
The feed amount for backtacking and condensed stitches
is set by means of the condensed stitch adjustment dial
u.
The scale is a guide only; if the length of the finished
stitches differs greatly from the scale value, make the
following adjustment.
In addition, carry out the following adjustment when
adjusting the forward feed amount and reverse feed
amount so that they are the same.
1. Set the condensed stitch adjustment dial u to the "0"
position.
2. While keeping the backtack lever i pressed down,
turn the machine pulley about 10 times and check that
the material feed amount is zero.
If the material feed amount is not zero, make the fol-
lowing adjustment.
3. Turn the condensed stitch adjustment dial u so that
it is slightly to the left or the right of the "0" position.
Repeat steps 2. and 3. until the zero position for the
material feed amount is located.
4. When the zero position for the material feed amount
has been located, loosen the screw o, turn only the
dial section of the condense stitch adjustment dial u
to the "0" position, and then re-tighten the screw o.
The \ mark on the level feed eccentric wheel w should
be aligned with the \ mark on the connecting rod e when
the reference line on the thread take-up lever q is aligned
with the (the B855E is B, the B856E is C) mark on the face
plate.
1. Tilt back the machine head.
2. Align the reference line on the thread take-up lever q
with the B mark (for the B855E) or the C mark (for the
B856E) on the face plate.
3. Loosen the four screws r.
4. Turn the level feed eccentric wheel w to align the \
mark with the \ mark on the connecting rod e.
5. Securely tighten the four screws r.
* If the needle and feed timing has been adjusted, you
should also adjust "6-11. Adjusting the needle and ro-
tary hook timing". (Refer to page 6-09.)
For the B856E, "6-18. Adjusting the timing of the thread
trimming" should also be adjusted. (Refer to page 6-
15.)
LZ2-B855E,B856E