82387 No. 66
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:
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 (E, shown in Fig. 16, above, and Fig. 5, page 6) at the front of the tension discs over to the right to increase the tension. To decrease the tension, turn the thumb nut over to the left.
FIG 16. NEEDLE THREAD TENSION
FIG. 14. TIGHT NEEDLE THREAD TENSION
If the tension on the bobbin thread is too tight or if hat on the needle thread is too loose, the bobbin thread will lie straight along the under side of the material, thus:
The tension on the bobbin thread is regulated by the larger screw (Fig. 4) which is nearest the back in the bobbin case tension spring. To increase the tension, turn the screw over toward you. To decrease the tension, turn the screw over from you.
FIG. 15. LOOSE NEEDLE THREAD TENSION
When the tension on the bobbin thread has been once properly adjusted it is seldom nec- essary to change it, as a correct stitch can usually be obtained by varying the tension on the needle thread.
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