JUKI LK-1900A Series Engineer's Manual page 29

Adjustment Procedures
1. If the thread on Side
Side cannot be cut, grind Side
C
(Caution) When grinding the side, make the angle more acuter than
90 degrees.
Adjustment Procedures
1. Turn off the power supply and look for any close contact between the
AT solenoid and the thrust collar
2. Loosen the three set screws
.
3. Hold the tension releasing pin adjust collar
loosen the nut .
4. Turn the tension releasing pin adjust collar
between the thread tension discs
disc floating)
5. Hold the tension releasing pin adjust collar
Mount the thread tension cap
6. Turn on the power supply and set up the thread tension. Confirm that
the thread tension discs
cannot be cut, grind Side
B
.
B
Secure an acute angle.
.
and remove the thread tension cap
. (Adjustment of thread tension
by means of the set screw
are closed.
. If the thread on
C
not to let it rotate, and
and adjust the gap
and tighten the nut .
.
– 25 –
Results of Improper Adjustment
o When less than 0.2mm
Thread on Side cannot be cut.
C
o When more than 0.2mm
Thread on Side cannot be cut.
B
Results of Improper Adjustment
o If the amount of disc floating is too
less, the residual thread length
can be changed or shortened
when the thread is thick.
o If the amount of disc floating is too
much, the tension discs cannot
close completely and normal
thread tension may fail to be cho-
sen. This can be a cause of im-
perfect sewing.