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4. SEWING
4-5. Sewing conditions and thread tension
4-5-1. Sewing conditions
Upper thread
Lower thread
Upper thread tension
Lower thread tension
Thread take-up spring height
Thread take-up spring tension
Pre-tension
Needle
Normal sewing speed
4-5-2. Upper thread tension
Weaker
Weaker
w
Stronger
Stronger
Weaker
Weaker
q
Stronger
Stronger
4-5-3. Lower thread tension
Weaker
Weaker
q
Specifications
Stronger
Stronger
Weaker
Weaker
Stronger
Stronger
Denim
#20 or equivalent
#30 or equivalent
120 - 220 g
20 - 30 g
6 - 10 mm
110 - 200 g
30 - 50 g
DP 17NY #21
2100 spm
To adjust the thread tension, turn the thread tension nut
q (main tension) to adjust the tension in accordance
with the material being sewn. In addition, turn the thread
tension nut w (sub-tension) to adjust so that the trailing
length of the upper thread is 35 - 40 mm.
NOTE
If the upper thread tension is too weak, it will
cause the thread to become tangled. If this
happens, increase the upper thread tension.
If the upper thread tailing length is long (50
mm or more), synchronization errors may occur
due to the thread becoming tangled at the
sewing start.
Set the lower thread tension to as weak a tension as
possible and so that the bobbin case drops by its own
weight when the end of the thread is held. Turn the ad-
justing screw q to adjust the tension.
NOTE: If the lower thread tension is too weak, it may
not be possible to cut the lower thread prop
erly dur ing thread trimming.
28
#30 or equivalent
#50 or equivalent
100 - 150 g
#19
BAS-705
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