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o LH-4128, 4128-7, 4168-7
1. Adjust the hand wheel
marker line of the 3-serial engraved marking, and press the inner hook
claw in the direction of the arrow. In this state, apply the inner hook
guide
to the inner hook and fix it.
2. When the inner hook guide
engraved marking
becomes small. When the inner hook guide
tion of the larger engraved marking
inner hook stop
becomes large.
o LH-4188-7
1. Turn the hand wheel
bring the inner hook guide
2. Turn the bobbin case
inner hook stop
to the throat plate rib
3. Loosen the setscrew
clearance to 0.3 to 0.4 mm between the inner hook guide
embossed part
of the bobbin case
A
the setscrew
.
1. In regard to the standard adjusting position for the inner hook guide
arm shaft
(eccentric shaft), loosen the setscrew to turn the inner
hook guide arm shaft
when the inner hook guide link
tighten the setscrew where the slot of inner hook guide arm shaft
becomes parallel to the throat plate
Adjustment Procedure
to the central point
is fixed to the position of the smaller
, the amount of opening for the inner hook stop
the amount of opening for the
in the normal direction (counterclockwise) to
to the extreme rear position.
in the direction of the arrow and apply the
(groove of the throat plate).
of the inner hook guide
. After adjustments, tighten
Adjustment Procedure
in the direction of the arrow, turn it further
comes closest to the hook
, as illustrated.
of the green engraved
is fixed to the posi-
and adjust the
and the
, and
– 19 –
Results of Improper Adjustment
When it stays on the side of the
shorter engraved marking
o Towel-face stitches, loosened
stitches or thread breakage will
result.
When it is adjusted faster than the
longer engraved marking
o The bobbin case may break.
If the clearance between the bobbin
case and the bobbin case opening
lever is large than the specified
value:
o Towel-face stitches, loosened
stitches or thread breakage will
result.
If the clearance is smaller than the
specified value:
o The bobbin case may break.
Results of Improper Adjustment
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