－
50
－
1) Turn the handwheel by hand. When needle bar
❶
has gone up, adjust so that lower marker line
❷
engraved on the needle bar aligns with the
bottom end of the needle bar bushing
❸
, lower.
2) Loosen setscrew
in the driver. Open inner
hook pressers
to the right and left, and re-
move inner hook presser
.
At this time, be careful not to let inner
hook
❹
come off and fall.
7-2. Adjusting the needle-to-shuttle relation
❹
Relation between needle and engraved lines
❶
❷
❸
❶
❷
❸
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
3) Adjust so that the blade point of inner hook
❹
aligns
with the center of needle
❺
, and that a clearance
of 0 mm is provided between the front end of the
driver and the needle as the front end face of driver
❻
receives the needle to prevent the needle from
being bent. Then tighten setscrew
of the driver.
4) Loosen setscrew
❼
of the shuttle, and adjust
the longitudinal position of the shuttle. To do this
adjustment, turn shuttle race adjusting shaft
❽
clockwise or counterclockwise to provide a 0.05
to 0.1 mm clearance between needle
❺
and the
blade point of inner hook
❹
.
5) After adjusting the longitudinal position of the
shuttle, further adjust to provide a 7.5 mm clear-
ance between the needle and the shuttle by
adjusting the rotating direction. Then tighten set-
screw
❼
of the shuttle.
If the sewing machine is left unused for a
long time, or after clearing the area sur-
rounding the hook section, apply a little
quantity of oil to race section
❾
and felt
before using the sewing machine.
0.05 to 0.1 mm
7.5 mm
❺
❹
❼
❽
0 mm
0 mm
❺
❹
❻
❾
