Needle-To-Hook Relationship; Height Of The Feed Dog - JUKI DDL-7000A-7 Series 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.
❶
❹
❸
B
A
❷
DDL-7000AS-7
DDL-7000AH-7
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.
❶
0.75 to 0.85 mm (DDL7000AS-7)
1.15 to 1.25 mm (DDL7000AH-7)
A
B
D
❺
a
Dimension D (mm)
0.04 to 0.10
0.12 to 0.20
❷
(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 ❶ .
(Adjusting the needle bar height)
2) Align marker line A on needle bar ❷ with the
bottom end of needle bar lower bushing ❸ , then
tighten setscrew ❶ .
(Adjusting position of the hook a)
3) Loosen the three hook setscrews, turn the hand-
wheel and align marker line B on ascending nee-
dle bar ❷ with the bottom end of needle bar lower
bushing ❸ .
4) After making the adjustments mentioned in the
above steps, align hook blade point ❺ with the
center of needle ❹ . Provide a clearance of 0.04
mm to 0.1 mm (reference value) between the nee-
dle and the hook, then securely tighten setscrews
in the hook.
To adjust the height of the feed dog :
① Loosen screw ❷ of crank ❶ .
② Move the feed bar up or down to make adjust-
ment.
③ Securely tighten screw ❷ .
If the clamping pressure is insufficient,
the motion of the forked portion becomes
heavy.
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