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3) When the tip of the fixed blade is worn away, grind
it on the greased grindstone.
Fixed blade
Greased
grindstone
7.7) Hook Lubrication Adjustment
1) When the lubrication adjusting screw ① is turned
clockwise (+ direction), the lubrication volume
increases.
2) When the lubrication adjusting screw ① is turned
counter-clockwise (- direction), the lubrication volume
decreases.
3) Conduct the idle operation of the sewing machine for
some 3 minutes and place the lubrication testing paper
as in the figure. Operate the machine for 5 seconds and
check the oil volume sprayed to the test paper.
4) Conduct the lubrication volume check three times. If
the sprayed oil volume is not below the minimum limit
or above the maximum limit, it means lubrication
volume is proper (If lubrication volume is too small,
hook may have problem. If lubrication volume is too
much, it may pollute sewing fabric.)
①
Hook
Bed
Lubrication testing paper
Oil strip
Minimum limit
some 0.5mm some 1mm,
Maximum limit
Oil strip
3~10mm
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