– 118 –
8-9. Replacing the gauge
❹
❸
❸
❶
❶
❷
❷
❹
❹
❺
❺
・
Moving the hook driving shaft base when
changing the gauge
1) Remove slide plate asm (side)
❶
and cap
❷
.
Loosen hook driving shaft base setscrew
❸
.
2) Loosen setscrews
❹
of the lower shaft set
collar. Move hook driving shaft base
❺
.
3) Adjust the clearance provided between the
needle and the blade point of hook appropri-
ately. (Refer to
"8-2. Adjusting the timing
between the needle and the blade point of
hook" p.107
.)
4) Tighten hook driving shaft base setscrew
❸
.
5) Tighten setscrews
❹
of the lower shaft set
collar.
6) Attach slide plate asm (side)
❶
and cap
❷
.
8-10. Replacing the bobbin thread slack prevention spring (LH-4588C)
❶
❷
Groove
1) Loosen screw
❶
and remove bobbin thread
slack preventer spring
❷
from the groove on
the bobbin case.
2) Fit bobbin thread slack preventer spring
❷
which replaces the removed spring in the
bobbin case through the groove.
3) Fix bobbin thread slack preventer spring
❷
in
the bobbin case by tighten screw
❶
. At this
time, carefully check the operating range and
tension or the spring.
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