Needle-To-Hook Relationship; Height Of The Feed Dog - JUKI DDL-8700A-7 Instruction Manual

20. Needle-to-hook relationship

WarNING :
Be sure to turn the power oFF before the following work in order to prevent personal injury due to
unintentional starting of the sewing machine.
1
3
A
B
2
4) After makng the adjustments mentoned n the above steps, algn hook blade pont 5 wth the center
of needle 4 . Provde a clearance of 0.04 mm to 0. mm (DDL-8700AH-7 : 0.06 to 0.7mm) (reference
value) between the needle and the hook, then securely tghten setscrews n 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.

21. Height of the feed dog

WarNING :
Be sure to turn the power oFF before the following work in order to prevent personal injury due to
unintentional starting of the sewing machine.
1
2
C
D
B
0.04 to 0.1 mm
4
5
a
0.75 to 0.85 mm
DDL-8700aS-7
1.15 to 1.25 mm
DDL-8700aH-7
(1) adjust the timing between the needle and
the hook as follows :
) Turn the handwheel to brght the needle bar
down to the lowest pont of ts stroke, and
loosen setscrew 1 .
(adjusting the needle bar height)
(For a DB needle) Algn marker lne A on
2)
A
needle bar 2 wth the bottom end of needle bar
lower bushng 3 , then tghten setscrew 1 .
(For a Da needle) Algn marker lne C on
needle bar 2 wth the bottom end of needle bar
lower bushng 3 , then tghten setscrew 1 .
(adjusting position of the hook a )
3) (For a DB needle) Loosen the three hook
setscrews, turn the handwheel and algn marker
lne B on ascendng needle bar 2 wth the bot-
tom end of needle bar lower bushng 3 .
(For a Da needle) Loosen the three hook
setscrews, turn the handwheel and algn marker
lne D on ascendng needle bar 2 wth the bot-
tom end of needle bar lower bushng 3 .
To adjust the heght 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 tghten screw 2 .
If the clamping pressure is insufficient,
the motion of the forked portion be-
comes heavy.
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