Adjusting The Thread Take-Up Spring; Example Of The Thread Tension - JUKI LK-1900A Instruction Manual

7. Adjusting the thread take-up spring

8. Example of the thread tension

When using the sewing machine for the first time, adjust the thread tension referring to the table below.
Thread
Polyester filament thread #50
Polyester spun thread #50
Polyester spun thread #60
(Thread clamp OFF)
Cotton thread #50
Cotton thread #20
Material
Needle thread
tension setting
Wool 30 to 35
Wool 50 to 55
T/C broad 30 to 35
Denim 35 to 45
Denim
35 to 45
16
The standard stroke of thread take-up spring
10 mm, and the pressure at the start is 0.1 to 0.3N.
1) Adjusting the stroke
Loosen setscrew , and turn thread tension asm.
.
Turning it clockwise will increase the moving
amount and the thread drawing amount will
increase.
2) Adjusting the pressure
To change the pressure of the thread take-up
spring, insert a thin screwdriver into the slot of
thread tension post
and turn it. Turning it clockwise will increase the
pressure of the thread take-up spring. Turning it
counterclockwise will decrease the pressure.
Thread take-up spring moving
amount [Thread drawing amount]
10mm [13mm]
10mm [13mm]
8 to 10mm [11 to 13mm]
10mm [13mm]
8 to 10mm [11 to 13mm]
is 8 to
while screw is tightened,
Strength
0.1N
0.2N
0.1N
0.1N
0.1N