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Juki DDL8700 Manual

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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)
(For a DB needle)
Align marker line
A
on
needle bar
2
with the bottom end of needle bar
lower bushing
3
, then tighten setscrew
1
.
(For a DA needle)
Align marker line
C
on
needle bar
2
with the bottom end of needle bar
lower bushing
3
, then tighten setscrew
1
.
(Adjusting position of the hook
a
)
3)
(For a DB needle)
Loosen the three hook set-
screws, turn the handwheel and align marker line
B
on ascending needle bar
2
with the bottom
end of needle bar lower bushing
3
.
(For a DA needle)
Loosen the three hook set-
screws, turn the handwheel and align marker line
D
on ascending needle bar
2
with the bottom
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 (DDL-8700H, 8700L : 0.06 to
0.17mm) (reference value) between the needle
and the hook, then securely tighten setscrews in
the hook.
If the clearance between the blade point
of hook and the needle is smaller than
the specified value, the blade point of
hook will be damaged. If the clearance is
larger, stitch skipping will result.
1
0.04 - 0.1 mm
2
3
4
5
A
B
C
D
a
A
B
To adjust the height of the feed dog :
1
Loosen screw
2
of crank
1
.
2
Move the feed bar up or down to make adjust-
ment.
3
Securely tighten screw
2
.
If the clamping pressure is insufficient,
the motion of the forked portion becomes
heavy.
DDL-8700
DDL-8700A
0.75 - 0.85 mm
0.7 - 0.8 mm
DDL-8700H
0.95 - 1.05 mm
1
2
DDL-8700L
1.0 - 1.1 mm
19.
HEIGHT OF THE FEED DOG
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.
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.
… 11 …


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