SINGER 15-30 Treadle Sewing Machine - Manual (Page 13)

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Sewing Machine No. 15
13
Tensions
For ordinary stitching, the needle and bobbin threads should be locked in the centre of the
thickness of the material, thus:
FIG. 13. 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. 14. 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
To Regulate the Tensions
The tension on the needle thread should only be regulated when the presser foot is down.
Having lowered the presser foot, turn the small thumb nut (12, Fig. 5) at the front of the
tension discs over toward you to increase the tension. To decrease the tension, turn the
thumb nut over from you.