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19.
INNER ROTARY HOOK TENSION
STANDARD
While slowly pulling polyester thread #60/3 plies using a tension gauge,
inner rotary hook tension should be 0.11-0.13N (11-13g). The difference
between this and the tension for silk thread (#80) should be 0.02-0.03N
(2-3g).
ADJUSTMENT
1.
Pass polyester thread #60 through the inner rotary hook correctly,
and pull it using the tension gauge.
2.
Adjust the tension by turning the screw to either the right or
left using a screwdriver.
NOTE :After adjusting the tension, lock the screw with paint.
20.
KNEE LIFTER
STANDARD
When 5N (500g) is applied to bend of lifter, there should be 2-3mm of space between lifter and presser holder
(see (A) on diagram).
ADJUSTMENT
1.
Lower presser foot. (To prevent operation of knee lever, feel free to remove it.)
2.
Loosen screw.
3.
Apply 5N (500g) load to bend of lift and measure amount of space between lift and presser holder (see (A)
on diagram).
4.
Tighten screw.
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