Adjusting The Thread Tension - Brother RH-981A Instruction Manual

7. SEWING

7-3. Adjusting the thread tension

Turn off the power.
Never adjust the thread tension while sewing.
<Reference values>
Upper thread tension
Lower thread tension
Thread take-up spring tension
Thread take-up spring stroke
Upper and lower thread
* 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
Turn the upper thread tension adjustment knob (1) in
the direction indicated by the arrow to increase the
upper thread tension.
Adjusting the lower thread take-up spring tension and stroke
47
Woolen materials + wool gimps
0.9 N
0.3 N
0.05 N
8 mm
# 30 polyester
Lower thread tension
3059Q
Turn the lower thread tension adjustment knob (2) in the
direction indicated by the arrow to increase the lower
thread tension.
3061Q
RH-981A
Denim (3 layers)
1.0 N
0.8 N
0.07N
8 mm
# 30 cotton
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).
3060Q