Singer 1200-1 - Page 13

20
Tensions
For ordinary stitching, the needle and bobbin
threads should be locked in the centre of the thick-
ness of the material, thus:
Fiu. 17. 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:
Fiu. IS. TIGHT XEEDLE THREAD TENSION
If t.hc 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. 19. LOOSE NEEDLE THKEAD TENSION
B
To Regulate the Needle Thread Tension
The tension on the needle thread can be regulated
only when the presser foot is down.
The tension index
flange (D, Fig. 20) is
marked with arbitrary
numbers ranging from
1 to 9 which indicate
different degrees of ten-
sion that can be pro-
duced. The numbers do
not denote the amount
of tension or a par-
ticular size of thread.
By noting the number
which is opposite the
FIG. 20. NEEDLE THREAD TENSION pointer Oil the indica-
tor (G) when set for a
satisfactory tension on the work being stitched, the
number can be readily reverted to when a change
is made in the tension or size of thread.
To increase the tension, turn the thumb nut
(B) over to the right until the desired number on
the index flange (D) is opposite the pointer, the
higher numbers denoting increased tension.
To decrease the tension, turn the thumb nut (B)
over to the left, the lower numbers indicating less
tension.
The tension indicator (G) is marked with the signs
+ and —, which also indicate which direction to turn
the thumb nut (B) for more or less tension.
To Regulate the Bobbin Thread Tension
The tension on the bobbin thread is regulated by
the screw (C, Fig. 11) in the bobbin case tension
spring. To increase the tension, turn the screw (C)
over toward you. To decrease the tension, turn this
screw over from you.
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 tension on the needle thread.