[I] Needle and rotary hook timing adjustments
In
order
for the tip
of
the rotary hook
to
catch the loop
in
the needle thread when the needle rises from the lowest
point. the needle
and
rotary hook must be correct.
1 . Needle bar height
•
Reference line
*
Turn
the pulley slowly.
and
lower the needle bar 8
to
the needle
down
position. Confirm
that
the second from
bottom
reference line on the needle
bar
8
is
aligned with the bottom
of
the needle
bar
bushing.
• Loosen set screw 8 and align this second reference line with the bottom
of
the needle
bar
bushing
8.
After
adjusting. firmly tighten set screw
8.
2.
Rotary hook position
0
Reference line
*
Turn
the pulley slowly.
and
align the
bottom
reference line on the needle
bar
8 with the
bottom
of
the needle
bar
bushing
8.
With the needle
bar
in this position. check that the rotary hook
pointe
is
aligned with the needle
center
0 and
that
the needle 0 to rotary hook point 8 gap
is
between 0.05 -
0.1
mm.
• Loosen set screw 8 and
after
aligning the rotary
hook
point 8 with the needle center
0.
adjust the needle 0
to
rotary
hook
point 8 gap to between 0.05 -
0.1
mm. Firmly tighten set screw
8.
* Always perform the steps for rotary hook lubrication adjustment after replacing the rotary hook.
-20-
To Next Page