S-7300A
12. STANDARD ADJUSTMENTS
74
<Thread take-up spring tension>
The standard tension of the thread take-up spring (1) varies
in accordance with the machine specifications as shown in
the table.
-[][]3 specifications
0.25 - 0.35N
-[][]5 specifications
0.30 - 0.5N
1. Press the upper thread slightly above the thread tension
bracket (5) with a finger to stop the thread spooling out.
2. Pull the upper thread downward so that the thread take-up
spring (1) is extended to the same height as the base of
the arm thread guide (3), and then measure the tension of
the thread take-up spring (1).
3. Insert the tip of a screwdriver into the groove in the thread
tension stud (6) and turn it to adjust the tension of the
thread tension spring (1).
NOTE:
If using a tension gauge (7) (part code: 183922-101)
to measure the tension, take the upper thread
reading from the scale [at the red line side].
* Do not adjust the tension of the thread take-up spring if
the presser foot has been raised by the lifting lever, or if
the thread trimmer solenoid is ON.
12-2. Arm thread guide R
The standard position of arm thread guide R (1) is the
position where the screw (2) is in the center of the adjustable
range for arm thread guide R (1).
* To adjust the position, loosen the screw (2) and then
move arm thread guide R (1).
・
When sewing heavy-weight material, move arm thread
guide R (1) to the left. (The thread take-up amount will
become greater.)
・
When sewing light-weight material, move arm thread
guide R (1) to the right. (The thread take-up amount
will become less.)
0913D
Scale
<-[ ][ ]3>
0.25 - 0.35N
<-[ ][ ]5>
0.3 - 0.5N
0914D
Becomes less
Becomes greater
