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7. SEWING
RH-9800
32
7-3. Adjusting the thread tension
Turn off the power.
Never adjust the thread tension while sewing.
<Reference values>
Woolen materials + wool gimps
Denim (3 layers)
Upper thread tension 0.9 N 1.0 N
Lower thread tension 0.3 N 0.8 N
Thread take-up spring tension 0.05 N 0.07N
Thread take-up spring stroke 8 mm 8 mm
Upper and lower thread # 30 polyester # 30 cotton
* If you change the type of material being used, it may be necessary to change the thread tension.
The upper thread tension given above is the tension when the upper thread is pulled out from the thread path hole of
the thread take-up lever, and the lower thread tension is when the lower thread is pulled out from the needle hole in the
throat plate.
Upper thread tension Lower thread tension
Adjusting the lower thread take-up spring tension and stroke
Tension adjustment
Loosen the screw (3) and turn the thread take-up spring
support (4) in the direction indicated by the arrow to
increase the tension of the spring (5).
Stroke adjustment
Loosen the screw (6) and turn the thread take-up spring
guide (7) in the direction indicated by the arrow to
increase the stroke of the spring (5).
0934Q
0933Q
(1)
(2)
Turn the upper thread tension adjustment knob (1) in the
direction indicated by the arrow to increase the uppe
r
thread tension.
Turn the lower thread tension adjustment knob (2) in the
direction indicated by the arrow to increase the lower thread
tension.
(4)
0935Q
(3)
(6)
(7)
(5)