Installing The Anti-Spin Spring; Thread Tension; Lower Thread Tension - Brother BAS-326H-484 Instruction Manual

4. PREPARATION BEFORE SEWING

4-5. Installing the anti-spin spring

If the following situations occur, operation can be improved by using an anti-spin spring.
• The lower thread becomes tangled inside the bobbin case
•
Uneven thread tightening occurs at the sewing start
Installation
1. While inserting the projections on
the anti-spin spring (1) into the
grooves of the bobbin case, insert
the anti-spin spring (1).
Insert so that the higher middle
part is facing upward.

4-6. Thread tension

[Thread tension reference]
Upper thread
Lower thread
Upper thread tension (N)
Lower thread tension (N)
Pre-tension (N)
Needle
Normal sewing speed

4-6-1. Lower thread tension

Weaker
28
2. Push the anti-spin spring (1) to insert it
securely so that it does not lift up
above the inside edge (A) of the
bobbin case.
#4 or similar
#4 or similar
2.5 − 3.0
1.0 − 1.5
0.3 − 0.6
DP x 17 #25
1,300 sti/min
Stronger
3185Q
BAS-326H-484, BAS-326H-484 SF
4715M
Adjust the lower thread tension by turning the adjusting
screw (1).
Removal
Use the tip of a screwdriver
or similar to remove as
shown in the illustration.
4716M