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Brother EF4-V41 - Rn1 Needle Breakage; Improper Thread Tension; Improper Chaining-Off

Brother EF4-V41
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~
Needle breakage
PROBLEM
<D
Poor
thread
quality.
® Needle size
too
small.
@ Incorrect needle location.
® Needle and
looper
out
of
sequence.
® Incorrect adjustment
of
needle guard.
[j] Improper thread tension
PROBLEM
<D
Poor
thread
quality.
®
Needlesizetoosmall.
@ Tension disk pressure
too
weak.
® Incorrect position
of
thread
take-up.
ADJUSTMENT
---..
Use
thread
of
good quality.
----..
Change
it
for
larger one.
----..
Correct needle location.
----..
Adjust
the
position
of
needle guard and looper properly.
~
Adjust
to
correct position
for
needle guard.
ADJUSTMENT
----..
Use
thread
of
good quality.
----..
Change
it
for
larger one.
----..
Adjust
to
suitable pressure.
----..
Adjust
to
correct position.
Ill Improper chaining-off
(~verlocking)
PROBLEM
ADJUSTMENT
<D
Incorrect threading.
----..
Refer
to
"Threading diagram."
®
Excessive
pressure
of
tension disk.
----..
Adjust
to
suitable pressure.
@ Tension disk pressure
too
weak.
----..
Adjust
to
appropriate pressure.
® Incorrect position
of
looper
thread
take-up.
----..
Adjust
to
correct position.
® Incorrect position
of
needle
thread
take-up.
----..
Adjust
to
correct position.
® Incorrect installation
of
chain feed dog.
----..
Adjust
to
correct position.
CV
Needle plate has flaws.
----..
Change
it
for
a
new
one, smooth
with
oil stone,
or
buff.
® Incorrect
timing
between
needle and looper.
----..
Adjust
to
correct
timing.
-88-·
From the library of: Superior Sewing Machine & Supply LLC

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