JUKI LK-1900AN User Manual

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Adjustment procedures Results of Improper adjustment
1. Start the test mode CP-7.
2. Tread on the pedal for needle thread clamp
3
origin retrieval.
3. Press the
key twice and set the needle thread clamp
support plate complete
4
in the needle thread clamp position.
4. Conrm that the clearance A becomes 0 between the needle
thread clamp
3
and the needle thread clamp support plate
complete
4
when the "−" key is pressed 3 to 4 times (for 3 to
4 pulses), and that both the needle thread clamp
3
and the
needle thread clamp support plate complete
4
move together
when the "−" key is pressed again.
5. If the clearance A becomes 0 with 5 or more pulses, loosen the
setscrew
1
and x the sensor mounting plate
2
after moving
it in the direction B.
6. If the clearance A becomes 0 with less than 3 pulses, loosen
the setscrew
1
and x the sensor mounting plate
2
after mov-
ing it in the direction C.
7. After the sensor mounting plate
2
has been xed, check the
above mentioned steps 2. to 4.
8. Using 3 to 4 pulses, repeat the steps 2. to 6. above until the
clearance A becomes 0.
9. Tread on the pedal for needle thread clamp
3
origin retrieval
and dene the most advanced position by pressing the
key once.
10. Conrm that the distances between the needle thread clamp
support plate complete
4
and the needle
5
are kept at 3 to 4
mm and 1.7 to 2.3 mm, respectively.
11. If the distance is found to be inadequate, adjust the position
toward the needle
5
according to "(36) Needle thread clamp
device connection/disconnection." Since then, make the above-
mentioned sensor adjustments again.
o
If there are too many pulses
used until the clearance A be-
comes 0, this can be a cause of
unthreading at the beginning of
sewing.
o
If the number of pulses is too
small until the clearance A be-
comes 0, the resistance toward
the needle thread becomes
large and this can be a cause of
thread breakage at the begin-
ning of sewing.
o
If the distance is improper be-
tween the needle thread clamp
support plate complete
4
and
the needle
5
, this will give rise
to interference between the
needle thread clamp
3
and the
needle
5
.

JUKI LK-1900AN Specifications

General

Brand	JUKI
Model	LK-1900AN
Category	Sewing Machine
Language	English