15. THREAD TENSION
(1)
Adjusting the needle thread tension
1)
As you turn thread tension No.1 nut 1 clockwise (in
direction A), the thread remaining on the needle
after thread trimming will be shorter.
2)
As you turn nut 1 counterclockwise (in direction B),
the thread length will be longer.
3)
As you turn thread tension No.2 nut 2 clockwise (in
direction C), the needle thread tension will be
increased.
4)
As you turn nut 2 counterclockwise (in direction D),
the needle thread tension will be decreased.
(2)
Adjusting the bobbin thread tension
1)
As you turn tension adjust screw 3 clockwise (in
direction E), the bobbin thread tension will be
increased.
2)
As you turn screw 3 counterclockwise (in direction
F), the bobbin thread tension will be decreased.
16. THREAD TAKE-UP SPRING
(1)
Changing the stroke of thread take-up spring 1.
1)
Loosen setscrew 2.
2)
As you turn tension post 3 clockwise (in direction A),
the stroke of the thread take-up spring will be
increased.
3)
As you turn the knob counterclockwise (in direction B),
the stroke will be decreased.
(2)
Changing the pressure of thread take-up spring
1.
1)
Loosen setscrew 2 and remove thread tension (asm)
5.
2)
Loosen setscrew 4.
3)
As you turn tension post 3 clockwise (in direction A),
the pressure will be increased.
4)
As you turn the post 3 counterclockwise (in direction
B), the pressure will be decreased.
17. ADJUSTING THE THREAD TAKE-UP STROKE
1)
When sewing heavy-weight materials, move thread guide 1
to the left (in direction A) to increase the length of thread
pulled out by the thread take-up.
2)
When sewing lights-weight materials, move thread guide 1 to
the right (in direction B) to decrease the length of thread
pulled out by the thread take-up.
3)
Normally, thread guide 1 is positioned in a way that marker
line C is aligned with the center of the crew.
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