SINGER 15-91 - Manual (Page 19)

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Stop the machine with the thread take-up lever
(5, Fig. 12) at its highest position, raise the presser
foot and draw the fabric back and to the left, pass
the threads over the thread cutter (A, Fig. 13) and
pull down lightly to sever them. Leave the ends of
the threads under the presser foot.
To Turn a Corner
Stop the machine when the needle is commencing
its upward stroke. Raise the presser foot and turn
the work as desired, using the needle as a pivot,
then lower the presser foot.
To Remove the Work
To Regulate the Pressure on the Material
For ordinary family sewing, it is seldom necessary
to change the pressure on the material. If sewing
fine silk or flimsy material, lighten the pressure by
turning the thumb screw (A, Fig. 24) on the top of
the machine over to the left so that it screws up. To
increase the pressure, turn this thumb screw over to
the right so that it screws down. The pressure
should be only heavy enough to prevent the material
from rising with the needle and to enable the feed to
move the work along evenly. The heavier the ma­
terial, the heavier the pressure; the lighter the
material, the lighter the pressure.