4. PREPARATION BEFORE SEWING
28
BAS-326H-484, BAS-326H-484 SF
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
4-6. Thread tension
[Thread tension reference]
Upper thread
#4 or similar
Lower thread
#4 or similar
Upper thread tension (N)
2.5
−
3.0
Lower thread tension (N)
1.0
−
1.5
Pre-tension (N)
0.3
−
0.6
Needle
DP x 17 #25
Normal sewing speed
1,300 sti/min
4-6-1. Lower thread tension
Adjust the lower thread tension by turning the adjusting
screw (1).
Installation
Removal
1. While inserting the projections on
the anti-spin spring (1) into the
grooves of the bobbin case, insert
the anti-spin spring (1).
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.
Insert so that the higher middle
part is facing upward.
Use the tip of a screwdriver
or similar to remove as
shown in the illustration.
4715M
4716M
Weaker
Stronger
3185Q