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5. Thread tension
(1) Thread take-up spring (purl stitch)
1) The thread take-up amount of thread take-up
spring
❶
is 8 to 10 mm, and the appropriate
pressure at the start is approximately 0.06 to
0.1N.
2) To change the stroke of the thread take-up
spring, loosen screw
❷
, insert a thin screwdriver
into the slot of thread tension post
❸
, and turn it.
3) To change the pressure of the thread take-up
spring, insert a thin screwdriver into the slot of
thread tension post
❸
while screw
❷
is tight-
ened, and turn it. Turning it clockwise will in-
crease the pressure of the thread take-up spring.
Turning it counterclockwise will decrease the
pressure.
(2) Adjusting the thread take-up amount of the
thread take-up lever
The thread take-up amount of the thread take-up
lever should be adjusted in accordance with the
thickness of the sewing products so as to obtain
well-tightened stitches.
a. For heavy-weight materials, loosen setscrew
❷
in thread guide
❶
, and move the thread guide to
the left. The thread take-up amount of the thread
take-up lever will be increased.
b. For light-weight materials, move thread guide
❶
to the right. The thread take-up amount of the
thread take-up lever will be reduced.
❶
❷
❶
❷
❸
