4. PREPARATION BEFORE SEWING

 

 

 

 

 

 

 

 

 

 

4-5. Thread tension

 

 

 

 

 

 

[Thread tension reference]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Specifications

 

Medium-weight materials

Heavy-weight materials

Seatbelt (-07[])

 

 

 

(-03[])

 

(-05[])

 

 

 

 

 

 

 

 

Upper thread

 

 

#50 or similar

#20 or similar

#4 or similar

 

 

 

 

 

 

 

 

 

 

Lower thread

 

 

#50 or similar

#20 or similar

#4 or similar

 

 

 

 

 

 

 

 

 

 

Upper thread tension (N)

 

 

0.8 − 1.2

1.4 − 1.8

1.2 − 2.0

 

 

 

 

 

 

 

 

 

 

Lower thread tension (N)

 

 

0.2 − 0.3

1.0 − 1.5

 

 

 

 

 

 

 

 

 

 

Pre-tension (N)

 

 

0.1 − 0.3

0.1 − 0.6

0.3 − 0.6

 

 

 

 

 

 

 

 

 

 

Needle

 

 

DP x 5 #16

DP x 17 #19

DP x 17 #25

 

 

 

 

 

 

 

 

 

 

Normal sewing speed

 

 

2,000 sti/min

2,000 sti/min

1,300 sti/min

 

 

 

 

 

 

 

 

4-5-1. Lower thread tension

 

 

 

 

 

 

 

 

 

Adjust the thread tension to the weakest possible tension by

 

 

 

 

 

 

 

turning the thread tension nut (1) until the bobbin case will

 

 

 

 

 

 

 

not drop by its own weight while the thread end coming out

 

 

 

 

 

 

 

of the bobbin case is held.

 

 

 

Stronger

 

 

 

 

 

 

Weaker

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2536Q

4-5-2. Upper thread tension

1. Turn the tension nut (1) (main tension) to adjust the tension as appropriate for the material being sewn.

2. Use the tension nut (2) (sub-tension) to adjust so that the upper thread trailing length after thread trimming is about 40 mm.

Stronger

Weaker

Stronger

Weaker

3067B

BAS-311H

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