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TENSIONS
For perfect stitching, the tension on needle and bobbin
threads must be heavy enough to pull threads to centre of
material and make a firm stitch, thus:
Fig. 23. Perfect Stitch
If the tension on the needle thread is too tight, or if that on
the bobbin thread is too loose, the needle thread will lie
straight along the upper surface of the material thus:
Fig. 24. Tight Needle Thread Tension
If the tension on the bobbin thread is too tight, or if that
on the needle thread is too loose, the bobbin thread will
lie straight along the under side of the material, thus:
Fig. 15. Loose Needle Thread Tension
NEEDLE THREAD TENSION
The tension on the needle thread is regulated by the
thumbnut near the tension discs. See Fig. 26.
To increase the needle thread tension, tighten thumbnut.
To decrease the needle thread tension, loosen thumbnut.
NOTE: Tension on needle thread can be tested only
when the feeding foot is down.
Fig. 26. Regulating Needle Thread Tension
BOBBIN THREAD TENSION
The tension on bobbin thread is regulated by the screw in
Figs. 27 and 28 on the end of the shuttle tension spring.
To increase bobbin thread tension, gradually tighten screw.
See Fig. 27.
To decrease bobbin thread tension, gradually loosen screw.
See Fig. 28.
When bobbin thread tension has been properly adjusted, it
is seldom necessary to change it because a correct stitch
can be usua11y obtained by varying the needle thread
tension.
Fig. 27. Increasing Bobbin Thread Tension
Fig. 28. Decreasing Bobbin Thread Tension
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