Manual Singer 29K73 (page 9 of 13) (English)

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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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Singer 29K73 Manual

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