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Singer 3851 Instruction Manual page 16

Automatic zig-zag

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Regulating the needle tension: Minor imperfections in
Decrease
the stitch can usually he corrected by varying the
Tension
needle tension unIv.
Increase
J
Tension
To increase the tension, turn the thumb nut clockwise and to lessen the tension, turn the nut in
the opposite direction.
The tension adjust from 0 to 9 in
one turn, with 0 being the lightest
tension and
9 being the tightest. All adjustments should be made
gradually, not abruptly, and the
required tension setting will
vary
with the size of thread being used A little practice will make
instant tension adjustments possible. All adjustments should be made while the presser foot is
down since an automatic release does not permit adjustments to he made when the foot is up.
If a perfect stitch cannot be obtained by adjusting the needle thread tension,
it
may be necessary
to adjust the bobbin thread tension as explained on page
,
Fig. C.
This machine is correctly adjusted before leaving the factory and checked and readjusted before
the dealer delivers to you A careful regulation of the tensions on this machine will assure you
of the finest seams that mechanical design will produce.
—13——

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