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CONDITION
3. BREAKING
UPPER
THREAD
4. BREAKING
BOBBIN
THREAD
5. NEEDLE
BREAKS
CAUSE
1.INITIAL S EWING SPEED IS
TOO FAST.
2.THREAD PATH IS
INCORRECT.
3.NEEDLE I SBENT ORDULL.
4.UPPER THREAD T ENSION I S
TOOSTRONG.
5.NEEDLE S IZE IS
INAPPROPRIATE
FOR
FABRIC.
! 6.NEEDLE E YE ISWORN.
7.NEEDLE H OLE INNEEDLE
PLATE I SWORN ORBURRED.
1.INCORRECTLY
THREADED
BOBBIN.
2.TOOMUCH THREADIS
ONTHEBOBBIN.
3. LINT ISSTUCK INSIDE THE
BOBBIN HOLDER.
4. THREAD QUALITY
IS
TOO LOW.
5. THREAD IS JAMMING
AROUND THE BOBBIN.
1. NEEDLE ISHITTING THE
NEEDLE PLATE.
2. NEEDLE IS BENT OR WORN.
3. NEEDLE IS HITTING THE
SHUTTLE.
4. THE FABRIC MOVES WHILE
THE NEEDLE IS PIERCING
IT, OR THE NEEDLE zIGZAGS
WHILE IN FABRIC.
5. FABRICISBEING PULLEDTOO
STRONGLY WHILE SEWING.
HOW TO FIX
START WITH MEDIUM SPEED.
USE THE PROPER THREAD
PATH.
REPLACE WITH A NEW NEEDLE.
ADJUST UPPER THREAD
TENSION CORRECTLY.
USE APPROPRIATE NEEDLE
FOR FABRIC AND THREAD
IN USE.
CHANGE THE NEEDLE.
REPAIR THE HOLE OR
REPLACE THE NEEDLE PLATE.
THREAD BOBBIN CORRECTLY.
ADJUSTTHE POSITION OF
STOPPER.
CLEAN THE SHUTTLE.
CHANGETO A HIGHERQUALITY
SEWING THREAD.
CLEAR OUT THE JAMMING
THREAD.
SEE MECHANICAL
ADJUSTMENT"NEEDLE
POSITION."
ICHANGETHE NEEDLE.
SEE MECHANICAL
ADJUSTMENT
"NEEDLE
CLEARANCE
TO SHUTTLE."
SEE MECHANICAL
ADJUSTMENT "NEEDLE
SWING."
GUIDE THE FABRIC GENTLY
WHILE SEWING.
IREFERENCE
P.30,31
P.26
P.13
3
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