17
Caution
▶ To check the lubrication volume of the looper, make sure hands or lubrication check
sheets do not touch moving parts such as feeding tools.
5) Adjustment of the lubrication to the
lower shaft
(1) Checking the oil supply level of hook
A. After racing the sewing machine for three minutes (at
an appropriate speed), secure the oil flow checking
paper as shown in Fig. 22 and run the machine for
about five seconds. Then check the oil tape marked
on the paper.
B. Check the oil supply level three times. The
appropriate level of oil is when the oil level neither
exceeds the maximum amount nor falls below the
minimum level. (If the lubrication volume is too
small, the looper might be damaged. If the
lubrication volume is too high, it may smudge the
sewing fabric.)
(2) Adjustment of the Oil Supply Level
Turn the oil flow adjusting screw① in the lower shaft
front bushing in a clockwise direction for more oil flow.
Turn it counterclockwise for less oil.
[Fig. 22]
Caution
▶ Turn off the power when adjusting the lower thread tension. If the operator mistakenly steps
down on the pedal while switched on, the machine will start automatically and can cause
physical injuries.
▶ When using the clutch motor, be aware that the motor will continue to rotate for a while after
the power is switched off. Start to work only after the motor has come to a complete stop.
about 0.5mm
Resulting Oil Tape
Minimum
Optimum Level
about 1mm
Resulting Oil Tape
Maximum
Optimum Level
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