35
The upper part thread
amout is smaller than its
lower part
Mechanical adjustment
Bobbin winder
The amount of thread wound on the bobbin should be 16.5 to 19.5 mm in diameter.
To adjust bobboin thread amount:
1. Loosen the setscrew A.
Adjust the stopper position to determine the thread
amount of bobbin.
16.5 to 19.5 mm
To adjust eveness of thread amount:
1. Turn the thread guide screw to adjust the eveness of
thread amount (see fig. 2).
If the thread amount of the lower part of bobbin is
smaller than its upper part, turn the guide screw to the
right (see fig. 3).
If the thread amount of the upper part of bobin is
smaller than its lower part, turn the guide screw to the
left (see fig. 4).
The upper part thread
amout is bigger than its
lower part.
Fig. 1
Fig. 2
Setscrew
Bobbin winder
stopper
Thread guide screw
Bobbin winder thread
guide cover
Fig. 3
Fig. 4
