– 19 –
Adjustment Procedure
Results of Improper Adjustment
o LH-4128, 4128-7, 4168-7
1. Adjust the hand wheel
to the central point
of the green engraved
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
is fixed to the position of the smaller
engraved marking
, the amount of opening for the inner hook stop
becomes small. When the inner hook guide
is fixed to the posi-
tion of the larger engraved marking
the amount of opening for the
inner hook stop
becomes large.
o LH-4188-7
1. Turn the hand wheel
in the normal direction (counterclockwise) to
bring the inner hook guide
to the extreme rear position.
2. Turn the bobbin case
in the direction of the arrow and apply the
inner hook stop
to the throat plate rib
(groove of the throat plate).
3. Loosen the setscrew
of the inner hook guide
and adjust the
clearance to 0.3 to 0.4 mm between the inner hook guide
and the
embossed part
A
of the bobbin case
. After adjustments, tighten
the setscrew
.
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.
Adjustment Procedure
Results of Improper Adjustment
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
in the direction of the arrow, turn it further
when the inner hook guide link
comes closest to the hook
, and
tighten the setscrew where the slot of inner hook guide arm shaft
becomes parallel to the throat plate
, as illustrated.
Содержание LH-4128-7
Страница 11: ... 7 MEMO ...
Страница 30: ... 26 1 2 3 4 4 Oil in the feed box Standard Adjustment 5 Replacement of the hook shaft oil wick ...
Страница 34: ... 30 2 Center link section Standard Adjustment ...
Страница 46: ... 42 3 Adjusting the thread presser spring A Standard Adjustment ...
Страница 50: ... 46 6 Adjustment of thread tension release Standard Adjustment Clearance 0 ...
Страница 65: ... 61 MEMO ...
Страница 68: ... 64 10 Installation removal of the needle bar rocking base B A ...
Страница 86: ... 82 MEMO ...
Страница 88: ...MEMO ...
