7. SEWING

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

(1)

0933Q

Turn the upper thread tension adjustment knob (1) in the direction indicated by the arrow to increase the upper thread tension.

(2)

0934Q

Turn the lower thread tension adjustment knob (2) in the direction indicated by the arrow to increase the lower thread tension.

Adjusting the lower thread take-up spring tension and stroke

(5)

(7)

(6)

(3)

(4)

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).

0935Q

32

RH-9800

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Brother DH4-B980 Adjusting the thread tension, Upper thread tension, Reference values, Tension adjustment

DH4-B980 specifications

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