9. ASSEMBLY
S-7200C
107
９-２１. Thread tension mechanism 1. Thread guide
2. Pre-tension assembly
3. Arm thread guide R
4. Screw
5. Tension release stud
6. Tension release pin
7. Thread tension bracket assembly
8. Set screw
9. Needle bar thread guide
10. Screw
4424M
■
Refer to “10-4. Adjusting arm thread guide R” when carrying out assembly.
■
Adjusting the vertical position of the
thread take-up spring
The standard vertical position for the thread
take-up spring (a) is 6 to 8 mm (4 to 6 mm fo
r
-3[]5 specifications) above the top of the
presser bar bracket thread guide (b) when the
presser foot is lowered.
1.
Lower the presser foot.
2.
Loosen the set screw (c).
3.
Turn the thread tension bracket (d) to
adjust the position of the thread take-up
spring (a).
4.
Tighten the set screw (c).
*
Check the forward/back position of the
thread tension bracket (d) before
tightening the set screw (c).
■
Adjusting the thread tension bracket
forward/back position
The forward/back position of the thread
tension bracket (d) is the position where the
tension discs (e) start to open when the
presser foot has risen 4 mm above the needle
plate.
1.
Loosen the set screw (c).
2.
With the presser foot raised 4 mm above
the needle plate, move the thread tension
bracket (d) forward or back to the point
where the tension discs (e) start to open.
3.
Tighten the set screw (c).
* Check the vertical position of the thread
take-up spring (a) before tightening the
set screw (c).
4428M
<-3[]S・-3[]3> 6～8㎜
<-3[]5> 4～6㎜
4429M
11. Thread guide D
12. Bobbin winder tension assembly
13. Set screw