Brother International EF4-B561 Service Manual - Page 37

STITCHING, Double, Chain, Stitch, CHECK, POINT, ADJUSTMENT

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• SKIP STITCHING (Double Chain Stitch) CHECK POINT ADJUSTMENT 1 Wrong threading. Refer to threading diagram. 2 Excessive pressure of tension disc. Adjust to proper pressure. 3 Wrong position of looper thread take-up. 1 • In case of skipping on rightward movement of looper. 1 Large clearance between looper and needle. Adjust to proper position. Adjust to proper position. 0 -0.05mm PAGE 31 25 21 2 Wrong position of needle guard. --. Adjust to proper position. 21 clearance 3 Top of looper blunt or bent. Change it for a new one or smooth with 21 oil stone or buff. Blunt Flaws 4 Wrong timing of double chain stitch looper. - Adjust to proper timing. 21 Standard specifications 1.5 mm High-lift specifications 1.3 mm - 35 -

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•
SKIP
STITCHING
(Double
Chain
Stitch)
CHECK
POINT
ADJUSTMENT
PAGE
1
Wrong
threading.
2
Excessive
pressure
of
tension
disc.
3
Wrong
position
of
looper
thread
take-up.
1
•
In
case
of
skipping
on
rightward
movement
of
looper.
1
Large
clearance
between
looper
and
needle.
Adjust
to
proper
position.
2
Wrong
position
of
needle
guard.
3
Top
of
looper
blunt
or
bent.
Refer
to
threading
diagram.
Adjust
to
proper
pressure.
Adjust
to
proper
position.
0
-0.05mm
--.
Adjust
to
proper
position.
clearance
Change
it
for
a
new
one
or
smooth
with
oil
stone
or
buff.
Blunt
Flaws
4
Wrong
timing
of
double
chain
stitch
looper.
—
Adjust
to
proper
timing.
Standard
specifications
1.5
mm
High
-lift
specifications
1.3
mm
31
25
21
21
21
21
-
35
-