JUKI DLN-6390 Manuel D'utilisation page 106

(3) Installing the needle cooler pipe (asm.)
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
A
1) Install needle cooler pipe (asm.) 2 on presser base 1 with screw 3 .
2) Adjust so that the top end of the needle cooler pipe faces to the needle hole which is located 10 mm below from the
upper dead position of the needle bar.
3) Pass air hose 4 of the needle cooler pipe through the hole A in the table and connect it to the speed controller.
After installing the needle cooler pipe, make sure of the following matters.
1. Turn the handwheel by hand and check that the needle does not interfere with the pipe.
2. Check that the presser foot does not interfere with the pipe when the presser foot gets over the
overlapped section.
(4) Adjusting the speed controller
High air pressure
2
4
Low air pressure
1
– 42 –
1
3
2
1) Loosen lock nut 1 and turn knob 2 to adjust the air
pressure for needle cooler.
Adjust the air pressure to such an extent that sewing is
not affected.
After the adjustment, be sure to tighten
lock nut 1 .
The knob has been turned back by 4.5 times
from full closing at the time of delivery.
When the air pressure is too low, there is
no effect of needle cooling. When the air
pressure is too high, thread slips off the
needle at the start of sewing or sewing
performance is not stabilized.