Adjusting The Timing Between The Needle And The Blade Point Of Hook - JUKI LH-4500C Series Instruction Manual

8-2. Adjusting the timing between the needle and the blade point of hook

LH-4578C
❸ A
❷
❶
– 107 –
・ Adjust the relation between the
needle and the hook as described
below:
1) Place the sewing machine in the hook
timing adjustment mode.
2) Set the feed pitch to 2.50 for the F type
model or to 3.00 for the G type model.
3) Turn the handwheel to bring the needle
B
bar to its lowest point. Loosen needle
bar connecting stud clamping screw ❶ .
4) Determine the needle bar height. Two
upper marker lines are for the DP × 5
(134) needle and two lower ones are
for the DP × 17 (135 × 17) needle.
[How to adjust the timing between the
needle and the blade point of hook
when DP × 5 (134) needle is used]
Align the uppermost marker line A with the
lower end of needle bar frame ❸ . Tighten
needle bar connecting stud clamping screw
❶ .
At this time, the needle bar goes up 2.2 mm
from its lowest point (to align 2nd marker
line B with the lower end of needle bar
frame ❸ ), the blade point of hook aligns
with the center of needle, and the upper end
of needle eyelet is spaced 1.2 mm from the
blade point of hook.
[How to adjust the timing between the
needle and the blade point of hook
when DP × 17(135 × 17) needle is used]
In this case, carry out the same procedure
as in the case of [ How to adjust the timing
between the needle and the blade point of
hook in the case of the DP x 5 (134) needle]
, using the two lower marker lines.