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

4-5. 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.

4-6. Adjusting the thread tension

❶
Short
Adjusting the needle thread tension
25mm
❹
❺
❸
❶
❷
Long
❷
❹
❸
1) Set the bobbin ❶ into bobbin case ❷ in the di-
rection shown in the figure.
2) Pass the thread through thread slit ❸ of bobbin
case ❷ , 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 ❹ .
3) Pass the thread through thread hole ❺ of the
horn section, and pull out the thread by 25mm
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 ❶ is turned clock-
wise, 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
slipped off.
Adjust needle thread tension from the operation pan-
el and bobbin thread tension with ❷ .
1) Press THREAD TENSION key
play the thread tension input screen.
2) Set a needle thread tension with DATA CHANGE
❹ The setting range is 0 to 200. In-
key
creasing the value increases the thread tension.
* The sewing machine with standard specifications
has been factory-set at 50 (the tension: 1.5 N
when using spun thread #50) at the time of ship-
ment. (When the thread tension No. 1 is opened.)
－ －
15
❸ to dis-