– 16 –
19. NEEDLE-TO-HOOK RELATION
1.5 mm
2.3 mm
0.05 to 0.1 mm
❷
❸
1) Set the stitch dial to 0 [zero].
2) Turn the handwheel and loosen setscrew
❶
in
the needle bar connection to adjust so that a
clearance of 1.5 mm is provided between the
top end of the needle eyelet of needle
❷
and
blade point
❸
of the hook when the needle bar
is raised by 2.3 mm from the lowest position of
its stroke. Then, tighten the screw again. (There
is an engraved marker line on the needle bar as
reference.)
3) Turn the handwheel to make the needle bar
ascend by 2.3 mm from the lowest position of its
stroke.
Tighten two setscrews
❹
in the screw gear (small)
so that blade point
❸
of the hook is almost
aligned with the center of needle
❷
. However,
fit the setscrew No. 1 having a V-shaped top end
of two setscrews
❹
to the V-groove on the hook
driving shaft and tighten it.
4) Loosen setscrews
❻
in the hook driving shaft
saddle and move the hook driving shaft saddle
to the right or left until a clearance of 0.05 to 0.1
mm is provided between the blade point
❸
of
the hook and the needle
❷
at the position where
blade point
❸
of the hook is almost aligned with
the center of needle
❷
. After the adjustment,
tighten setscrews
❻
.
5) Loosen two setscrews
❺
in the screw gear (large)
and move the screw gear (large) to the right or
left until blade point
❸
of the hook is aligned with
the center of needle
❷
.
After the adjustment, tighten setscrews
❺
. How-
ever, fit the setscrew No. 1 of two setscrews
❺
to the flat section of the hook driving shaft and
tighten it.
❶
❹
❺
❻
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
18. ADJUSTING THE PRESSURE OF THE PRESSER FOOT
Turn presser spring regulating dial
❶
clockwise (
A
)
to increase the pressure of the presser foot, or coun-
terclockwise (
B
) to decrease it.
After the adjustment, tighten nut
❷
.
(Caution) Be sure to operate the sewing machine
with the pressure of the presser foot
minimized as long as the presser foot
securely holds the material.
❶
❷
A
B
