4. SEWING
4-5-4. Adjusting the thread tension spring
・ Operating range of thread take-up spring
The standard operating range for thread take-up
spring Lq and thread take-up spring R w is 6 - 10
mmfor both springs.
<Thread take-up spring L q>
1. Loosen the left and right screws e, and then turn the
left and right thread take-up spring stoppers r to
adjust the operating range.
NOTE: The screws e and the thread take-up spring
stoppers are integrated.
2. Tighten the screws.
<Thread take-up spring R q>
1. Loosen the screw r and then move the thread take-
up spring stopper left or right to adjust.
2. After adjusting, tighten the screw r.
・ Thread take-up spring tension
The standard tension for thread take-up spring L q
and thread take-up spring R w is 1.08-1.96 N(110gf-
200gf) for both sprnings.
NOTE: The thread take-up spring tension is the ten-
sion which is applied by the thread take-up
spring when it is horizontal to the lower end of
the arm thread hook.
<Thread take-up spring Lq>
1. Loosen the set screw e.
2. Loosen the knob r, and then turn the thread tension
stud t to adjust the tension.
3. Tighten the set screw e, and then tighten the knob
r.
<Thread take-up spring R w>
1 Loosen the set screw y.
2. Loosen the knob r, and then turn the thread tension
stud u to adjust the tension.
3. Tighten the set screw y, and then tighten the knob
r.
― 29 ―
BAS-705
q
w
e
t
r
u
r
y
1.08-1.96N
Weaker
Stronger
Stronger
Weaker
q
w
r
e
6-10mm
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