Installing The Bobbin; Adjusting The Thread Tension - JUKI LK-1900A Instruction Manual

5. Installing the bobbin

WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the
sewing machine.

6. Adjusting the thread tension

q
Short
Adjusting the needle thread tension
h
2.5 cm
r
t
e
q
w
Long
1) Set the bobbin q into bobbin case w in the direction
shown in the figure.
2) Pass the thread through thread slit e of bobbin
case w, and pull the thread as it is. By so doing,
the thread will pass under the tension spring and
be pulled out from thread hole r.
3) Pass the thread through thread hole t of the horn
section, and pull out the thread by 2.5 cm from the
thread hole.
If the bobbin is installed in the bobbin
case orienting the reverse direction, the
bobbin thread pulling out will result in an
inconsistent state.
If thread tension controller No. 1 q is turned clockwise,
the length of remaining thread on the needle after
thread trimming will be shorter. If it is turned
counterclockwise, the length will be longer.
Shorten the length to an extent that the thread is not
w
slipped off.
Adjust needle thread tension from the operation panel
and bobbin thread tension with w.
1) Select thread tension
2) Set needle thread tension with
key. There is a setting range of 0 to 200. When the
set value is increased, the tension becomes higher.
* The tension is set so that 1.5 N (spun thread
#50) is obtained at the set value 50 at the time
of standard delivery. (When thread tension No.
1 is released)
15
with key.
key or