JUKI LK-1900AN Engineer's Manual page 47

Adjustment procedures
1. Select the test mode No. 2 (CP-2) origin retrieval.
2. Origin retrieval is conducted each time the pedal is trodden on.
Loosen the sensor slit set screw 1 and shift the position of the
sensor slit plate 2 . Apply the work feed plate to the origin posi-
tion. Refer to "(22) Position of the mechanical origin."
(Caution) After adjustments, confirm that the sensor slit plate
2 does not interfere with the sensor 3 .
Adjustment procedures
1. Loosen the screw 1 to adjust the clearance between the wiper
2 and the needle so that this clearance attains 1.5 mm or
more.
2. Loosen screw 1 and adjust the distance A between the wiper
2 end plane and the needle center until this distance attains
the values specified below.
After adjustments, tighten the screw 1 firmly.
Distance A between the needle center and the wiper 2 end
plane (A mm)
· Other than LK-1903AN : 23 to 25 mm
· LK-1903AN only
* The needle stays in the position of the end of sewing and stop.
: 15 to 17 mm
– 35 –
Results of Improper adjustment
Results of Improper adjustment
If Distance A is too small, the
o
presser foot may tread on the
needle thread when the presser
foot is lowered. At that time, the
needle thread may be caught by
the wiper 2 and the needle may
be broken.
In particular, this must be taken
into consideration when a thin
needle (#11 or less) is used.