Brother International EF4-B561 Service Manual - Page 35

THREAD, BREAKAGE, Double, Chain, Stitch, Needle, CHECK, POINT, ADJUSTMENT, BREAK, Looper, Thread

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Page 35 highlights

• THREAD BREAKAGE (Double Chain Stitch Needle) CHECK POINT 1 Wrong threading. 1 2 Excessive pressure of tension disc. 3 Poor thread quality. 4 Needle groove or needle eye poorly finished. 1 5 Wrong position of chain stitch needle thread guide. 6 Wrong position of looper thread take-up. - 7 Needle thread passage has flaw. - 8 Double chain stitch looper has flaw. - 9 Wrong adjustment of needle guard. - ADJUSTMENT PAGE Refer to threading diagram. Adjust to proper pressure. 31 Use thread of good quality. Change needle for a good one. Adjust to proper position. 16 Adjust to proper position. 25 Change thread guide for a new one. Change it for a new one or smooth surface 20 with oil stone or buff. Blunt Flaws Adjust to proper clearance between needle 21 and needle guard. Clearance 10 Wrong timing of needle and looper. - Adjust to proper timing. 21 ❑2 THREAD BREAK (Looper Thread) CHECK POINT ADJUSTMENT 1 Wrong threading. - Refer to threading diagram. 1 2 Excessive pressure of tension disc. ---. Adjust to proper pressure. 28 3 Poor thread quality. Use thread of good quality. 4 Wrong position of looper thread take-up. Adjust to proper position. 24 5 Looper thread passage has flaw. Change thread guide for a new one. 6 Needle plate has flaw. Change it for a new one and smooth surface with oil stone or buff. - 33 - Flaws

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•
THREAD
BREAKAGE
(Double
Chain
Stitch
Needle)
CHECK
POINT
ADJUSTMENT
PAGE
1
Wrong
threading.
1
2
Excessive
pressure
of
tension
disc.
3
Poor
thread
quality.
4
Needle
groove
or
needle
eye
poorly
finished.
1
5
Wrong
position
of
chain
stitch
needle
thread
guide.
6
Wrong
position
of
looper
thread
take-up.
7
Needle
thread
passage
has
fl
aw.
8
Double
chain
stitch
looper
has
fl
aw.
9
Wrong
adjustment
of
needle
guard.
10
Wrong
timing
of
needle
and
looper.
Refer
to
threading
diagram.
Adjust
to
proper
pressure.
Use
thread
of
good
quality.
Change
needle
for
a
good
one.
Adjust
to
proper
position.
—
Adjust
to
proper
position.
-
Change
thread
guide
for
a
new
one.
-
Change
it
for
a
new
one
or
smooth
surface
with
oil
stone
or
buff.
Blunt
Flaws
-
Adjust
to
proper
clearance
between
needle
and
needle
guard.
Clearance
-
Adjust
to
proper
timing.
31
16
25
20
21
21
❑2
THREAD
BREAK
(Looper
Thread)
CHECK
POINT
ADJUSTMENT
1
Wrong
threading.
1
2
Excessive
pressure
of
tension
disc.
3
Poor
thread
quality.
4
Wrong
position
of
looper
thread
take-up.
5
Looper
thread
passage
has
fl
aw.
6
Needle
plate
has
fl
aw.
-
Refer
to
threading
diagram.
---.
Adjust
to
proper
pressure.
Use
thread
of
good
quality.
Adjust
to
proper
position.
Change
thread
guide
for
a
new
one.
Change
it
for
a
new
one
and
smooth
surface
with
oil
stone
or
buff.
Flaws
28
24
—
33
—