127-3 & 128-3
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11
Tensions
For ordinary stitching the needle and the bob-
bin threads should be locked in the centre of
the thickness of the material, thus:
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. 13. PERFECT STITCH
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 (D, Fig. 5) 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.
The tension on the bobbin thread is regulated
by the small screw (1, Fig. 7) near the point
of the shuttle. To increase the tension, turn
the screw over to the right. To decrease the
tension, turn the screw over to the left.
When the tension on the bobbin thread has
been once properly adjusted, it is seldom
necessary to change it, as a correct stitch
can usually be obtained by varying the ten-
sion on the needle thread.
