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CONDITION
6. NOISY
1. BACKLASH BETWEEN
OPERATION
ROTARY HOOK GEAR AND
LOWER SHAFT GEAR IS TOO
GREAT.
2. TOO MUCH UPPER SHAFT PLAY
3. INAPPROPRIATE BELT
TENSION.
4. UPPER SHAFT GEAR IS LOOSE.
5. NOT ENOUGH OIL.
7. DEFORMATION
1. INAPPROPRIATE ZIGZAG
PATTERN
SYNCHRONIZATION.
2. STRETCH STITCH FEED IS
OUT OF BALANCE.
CAUSE
3
HOW TO FIX
SEE MECHANICAL
ADJUSTMENT "NEEDLE
CLEARANCE TO ROTARY HOOK".
REDUCE THE UPPER SHAFT PLAY
SEE MECHANICAL
ADJUSTMENT "MOTOR BELT
TENSION".
ELIMINATE THE LOOSENESS.
OIL ALL MOVING PARTS.
SEE MECHANICAL
ADJUSTMENT "NEEDLE
SWING".
SEE MECHANICAL
ADJUSTMENT
"STRETCH STITCH BLANCE".
REFERENCE
P.15
P.25
P.11
P.20
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