Needle-To-Hook Relationship - JUKI DDL-9000BHS Instruction Manual

19. NEEDLE-TO-HOOK RELATIONSHIP

WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of
the sewing machine.
❹
❺
(Caution) Periodically clean RP hook (dry hook) since the hook rolls up thread waste or cloth waste and
failure of the machine or defective sewing may be caused.
(Caution) Because the needle bar ❷ of DDL-9000B-MS and DS is black colored, sometimes it is hard to
see the engraved lines. Make the working area bright by bringing a light or by other method.
❶
C
D
A
B
0.04 to 0.1 mm
A
❸
A
B
❷
Adjust the timing between the needle and the hook
as follows :
1) Adjusting the needle bar height. Turn the hand-
wheel to bright the needle bar down to the lowest
point of its stroke, and loosen setscrew ❶.
2) Adjusting the needle bar height. Align marker line
(For a DB needle : marker line A, For a DA needle
: marker line C) on needle bar ❷ with the bottom
end of needle bar lower bushing ❸, then tighten
setscrew ❶.
Position the needle and the hook A.
3)
Loosen the three hook setscrews, turn the hand-
wheel in normal rotation and align marker line (For
a DB needle : marker line B, For a DA needle :
marker line D) on ascending needle bar ❷ with
the bottom end of needle bar lower bushing ❸.
In this state, align hook blade point ❺ with the
4)
center of needle ❹. Provide a clearance of 0.04
mm to 0.1 mm (reference value) between the
needle and the hook, then securely tighten the
three hook setscrews.
(Caution) 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.
• RP hook (dry hook) is used for the hook of
DDL-9000B-DS type. When replacing, use the
part No. described below. There are two kinds
of Part Nos. of the hooks classified by the
regions.
22890206
22890404 (For Europe)
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