Cautions In Operation - JUKI LK-1941 Manuel D'utilisation

6-3. Adjustment of the bobbin thread winder components
WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.
(1) Adjusting the bobbin winder thread tension
Bobbin thread
A
5 mm
Bobbin
B
1
(2) Adjusting the winding amount of the bobbin thread
A
B
2

7. Cautions in operation

Closed
Reference for the sewing speed to be applied
Denim 8 pcs.
Denim 12 pcs.
Synthetic leather
Leather
Seat belt
Bobbin thread guide
Top cover
A
B
1
Opened
Sewing speed (sti/min)
2,000 to 2,200
1,500 to 1,800
1,500 to 1,800
1,500 to 1,800
1,000 to 1,200
1) Loosen nut 1, and adjust the height so that the
clearance between the bobbin thread guide and
the top cover should be approximately 5 mm.
2) If the bobbin thread is wound like A, the height
should be higher than 5 mm. If it is like B, the height
should be lower than 5 mm.
1) If the winding amount of the bobbin thread is
excessive, loosen setscrew 1, and move bobbin
thread winder lever 2 in the direction A. Then fix it.
2) If the winding amount of the bobbin thread is small,
loosen setscrew1, and move bobbin thread winder
lever 2 in the direction B. Then fix it.
(1) When threading and the sewing machine is
switched ON, in case the thread tension disk is
closed, sew the desired sewing pattern. After thread
trimming, the thread tension disk will open.
(2) When the error indicator lamp lights up, be sure to
check the cause of trouble and take a proper
corrective measure.
(3) Do not draw, by hand, the material being sewn
during sewing. Doing so will cause the needle shift
from the correct position. If the needle moves from
the correct position, press the
This will return the needle to the normal origin.
※ To prevent the thread breakage due to the needle
heat, set the sewing speed referring to the left-hand
table in accordance with the sewing conditions.
key two times.
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