Thread Tension Adjustment; Tension Nut Adjustment; Needle Thread Control - Singer 321C Instruction Manual And Parts List

3.6
Thread Tension
Adjustment
3.6.1
Tension Nut
Adjustment
3.6.2
Needle
Thread Control
Note
The signal (+)
increases the tension
in the thread. The
signal (-) reduces the
tension of the thread.
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Important
The thread tension should be adjusted according to the type and thickness of
cloth, thread, sewing width, stitch length and others. Therefore, the pressure on
the Tension Buttons or Thread Guides should be individually adjusted for each case.
The following adjustments are re-
lated to figure 10.
Tension Nut 1: controls the needle
thread or the left thread in case of
two needles.
Tension Nut 2: controls the thread
in the right needle.
For all types of stitch 504, 512 or 514,
move down the guides '1' and '2'.
For the types of stitch 503 and 505,
move the guides '1' and '2' to the
highest point.
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Tension Nut 3: controls the thread
in the right looper
Tension Nut 4: controls the thread
in the left looper
Tension Nut 5: controls the thread
of the safety stitch.
Figure 10
High Speed Overlock Machine |
Figure 11
Instructions Manual and Parts List
10