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7. MAINTENANCE
7-1. Adjusting the knife
CAUTION :
• To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
• To protect against possible personal injury, never touch the blade of the knife with fingers and
hands.
• To prevent possible accidents caused by inexperienced persons and those resulting from
maladjustment, adjustment work should only be carried out by maintenance personnel who have
received safety training and are familiar with the sewing machine.
4
3
7-2. Cleaning the machine head
CAUTION :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the fol-
lowing work after turning the power off and ascertaining that the motor is at rest.
To adjust the extent of cutting fluff at the overedged
edge of the materal :
)
Loosen setscrew 1 . Tghten the setscrew wth
lower knfe 2 pressed to the left.
)
Loosen setscrew 3 . Move upper knfe as far as
needed and secure wth the setscrew 4 .
1
3)
Lower the upper knfe to ts lower end poston.
Loosen setscrew 3 to adjust so that the lower
knfe comes n contact wth the upper knfe, then
tghten setscrew 3 .
1. Be sure to tighten screw 5 before oper-
2
ating machine.
2. After the completion of adjustment,
make the knives cut a thread to check
for sharpness of the knives.
Clear lnt from nsde the looper cover and the needle
bar and components about once or twce a day. If
not, ol may leak the sewng materal wll be soled.
Do not wipe the coated surface of the ma-
chine head with lacquer thinner. Doing so
will damage the coated surface.
– 37 –
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