Adjusting The Thread Tension - Brother RH-9820 Instruction Manual

6. USING THE SEWING MACHINE (SEWING OPERATION)

6-3. Adjusting the thread tension

The thread tension needs to be adjusted in accordance with the articles being sewn.
[Reference thread tensions]
Material
Thread used
Needle
Upper thread tension (N)
Lower thread tension (N)
Thread take-up spring tension (N)
Thread take-up spring stroke (mm)
* 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.
0442B
0443B
55
Woollen material
(2 layers) + padding
#30 synthetic thread
DO x 558 Nm90
Increase Decrease
Decrease
Increase
RH-9820
0.6
0.3
0.05
8
<Upper thread tension adjustment>
1. Adjust by turning the tension nut (1).
2. Turn the tension nut (2) (sub tension) to adjust so that the
upper thread trailing length is about 35 mm.
* When the tension nut (2) is turned clockwise, the
upper thread trailing length will decrease, and when it
is turned counterclockwise, the length will increase.
<Lower thread tension adjustment>
Adjust by turning the tension nut (3).
Denim (3 layers)
#50 spun thread
DO x 558 Nm110
1.0
0.3
0.07
8