SINGER 15-90 - Manual (Page 22)

20
THREAD TENSIONS
For ordinary stitching, the needle and bobbin
threads should be locked in the center of the thick­
ness of the material, thus:
F ig . 18. P erfect S titching
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:
---
Enm
F ig . 19. T ight N eedle T hread T ension
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:
m.
E1I3I9
F ig . 20. L oose N eedle T hread T ension
TO REGULATE THE
NEEDLE THREAD TENSION
The tension on the
needle thread can be
regulated only when
the presser foot is
down.
The numerals “0 to
9’’ on the dial C, Fig.
21 indicate the dif­
ferent degrees of ten-
s i o n t h a t c a n b e
obtained. The num­
bers do not denote the
size of thread or ounces
of tension.
F ig . 21. N eedle T hread T ension