18. NEEDLE-TO-HOOK RELATIONSHIP
(1) Adjust the timing between the needle
and the hook as follows :
1) Turn the handwheel to bright the needle bar down
to the lowest point of its stroke, and loosen set-
screw
1
.
(Adjusting the needle bar height)
2) This machine uses the DB needle. To use the DB
needle, align engraved marker line
A
of needle
bar
2
with the lower end of needle bar lower
bushing
3
and tighten needle bar connecting
stud setscrew
1
.
(Adjusting position of the hook
a
)
3) This machine uses the DB needle. To use the
DB needle, loosen two hook setscrews, turn the
handwheel to move needle bar
2
upward its
engraved marker line
B
is aligned with the lower
end of needle bar lower bushing
3
.
4) After making the adjustments mentioned in the
above steps, align hook blade point
5
with
the center of needle
4
. Provide a clearance of
0.04 mm to 0.1 mm (0.06 to 0.12 mm for DDL-
8100eH) (reference value) between the needle
and the hook, then securely tighten setscrews in
the hook.
0.04 to 0.1 mm
1
2
3
4
5
A
B
a
A
B
WARNING :
To avoid possible personal injury due to abrupt start of the machine, turn off the power to the
machine and check to be sure that the motor has totally stopped rotating in prior.
If the clearance between the blade point of hook and the needle is smaller than the specied
value, the blade point of hook will be damaged. If the clearance is larger, stitch skipping will
result.
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