Adjusting The Thread Tension - Brother DH4-B981 Instruction Manual

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.
7-3-1. Upper thread tension
Turn the upper thread tension adjustment knob q in the
direction indicated by the arrow to increase the upper
thread tension.
7-3-3. Adjusting the lower thread take-up spring tension and stroke
t
u
y
e
r
Woolen materials + wool gimps
0.9 N
0.3 N
0.05 N
8 mm
#30 polyester
q
0933Q
0935Q
DH4-B981
Denim (3 layers)
1.0 N
0.8 N
0.07 N
8 mm
#30 cotton
7-3-2. Lower thread tension
w
Turn the lower thread tension adjustment knob w in the
direction indicated by the arrow to increase the lower
thread tension.
Tension adjustment
Loosen the screw e and turn the thread take-up spring
support r in the direction indicated by the arrow to
increase the tension of the spring t.
Stroke adjustment
Loosen the screw y and turn the thread take-up spring
guide u in the direction indicated by the arrow to increase
the stroke of the spring t.
7. SEWING
0934Q
45