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– 15 –
To adjust the height of the feed dog :
1) Loosen screw of crank .
2) Move the feed bar up or down to make adjust-
ment.
3) Securely tighten screw .
If the clamping pressure is insufcient,
the motion of the forked portion becomes
heavy.
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
setscrew .
Adjusting the needle bar height.
2) [For a DB/DP needles]
Align marker line A on the needle bar with the
bottom end of the needle bar lower bushing ,
then tighten clamping screw of the needle bar
connection.
[For a DA needle] (Only DDL-8700BS-7)
Align marker line C on the needle bar with the
bottom end of the needle bar lower bushing ,
then tighten clamping screw of the needle bar
connection.
Adjusting position of the hook .
3) [For a DB/DP needles]
Loosen three setscrews of the hook, turn the
handwheel and align marker line B on ascending
the needle bar with bottom end of the needle
bar lower bushing .
[For a DA needle] (Only DDL-8700BS-7)
Loosen three setscrews of the hook, turn the
handwheel and align marker line D on ascending
the needle bar with bottom end of the needle
bar lower bushing .
4) After making the adjustments mentioned in the
above steps, align the blade point E of hook
with the center of needle . Provide a clearance
of dimension F (reference value) between the
needle and the hook , then securely tighten
three setscrews of the hook.
If the clearance between the blade point
of hook and the needle is smaller than the
specied value, the blade point of hook
will be damaged. If the clearance is larger,
stitch skipping will result.
22. Needle-to-hook relationship
23. 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.
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.
Dimension F
(mm)
DDL-8700BS-7 0.04 to 0.10
DDL-8700BH-7
0.12 to 0.20
DDL-8700BJ-7
0.75 to 0.85 mm
1.15 to 1.25 mm
DDL-8700BS-7
DDL-8700BH-7
DDL-8700BJ-7
A
B
DDL-8700BH-7
DDL-8700BJ-7
E
F
C
D
A
B
A
B
DDL-8700BS-7
A
B
DDL-8700BH-7
DDL-8700BJ-7
DDL-8700BS-7
17


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