Needle-To-Hook Relationship - JUKI PS-800SB-2850 Instruction Manual

4-7. 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
a
❸
A
❷
❶
C
D
A
B
0.04 to 0.1mm
B
– 18 –
Adjust the timing between the needle and the hook
as follows :
1) Adjusting the needle bar height. Turn the
handwheel 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 .
3) Position the needle and the hook a.
Loosen the three hook setscrews, turn the
handwheel 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 bush-
ing ❸ .
4) In this state, align hook blade point ❺ with the
center of needle ❹ . Provide a clearance of 0.04
to 0.1 mm (reference value) between the needle
and the hook, then securely tighten the three
hook setscrews.
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.