Adjusting The Tension Of The Lower Thread Presser Spring (B856E); Adjusting The Thread Wiper (B856E) - Brother LZ2-B855E Service Manual

6-19. Adjusting the tension of the lower thread presser spring (B856E)

e
Becomes
weaker

6-20. Adjusting the thread wiper (B856E)

<Seen from the rear>
w
<Seen from the front>
u
w
6-8mm
1043S
1039S
w
q
e
1040S
r
Nylon thread
t
Becomes stronger
q
0.03-0.11N
1041S
1042S
t
y
q
w
e
r
Align
1044S
LZ2-B855E,B856E
Adjust the tension of the lower thread presser spring q
so that the tension is 0.03 to 0.11 N when the lower thread
presser spring q is pulling the lower thread (nylon thread:
100D 1 X 3 (Z)) after thread trimming.
1. Remove the knife unit w. (Refer to instruction manual
page 130.)
2. Move the knob e to slide out the movable knife r,
and then hook the thread as shown in the illustration.
3. Return the movable knife r to trim the thread. After
this, measure the tension of the lower thread presser
spring q while it is pulling the lower thread.
4. Turn the screw t to adjust the tension of the lower
thread presser spring q to 0.03 to 0.11 N.
Note:
If using a tension gauge (sold separately) to measure
the tension, take the reading from the scale on the side
of the red line.
<Horizontal position adjustment>
The front corner of the thread wiper w and the left edge
of the needle hole of the presser foot e (or the needle
hole of the needle plate r) should be aligned when the
solenoid plunger q is pushed up as far as it will go.
Loosen the two screws t and move the setting plate 6
up or down to adjust.
* If the finger guard of the presser foot and the thread
wiper interfere with each other during actual opera-
tion, move the thread wiper position to the right (when
looking from the front).
<Height adjustment>
Check that the distance from the bottom edge of the thread
wiper w to the top of the needle plate r is 6 to 8 mm, and
that the thread wiper w catches the thread firmly.
Loosen the screw 7 and move the thread wiper w up or
down to adjust.
r
6. ADJUSTMENTS
6-16