SINGER 15-91 User Manual

Page 26

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point there should be a barely perceptible pull on the

thread to indicate that there is a minimum tension

on the thread, which gradually increases with the

turn of the thumb nut to the right, providing a full

range of tensions from light to heavy within one revo

lution of the thumb nut. If the pull is too strong for

a minimum tension, press in the numbered dial to dis

engage the pin in the thumb nut from the dial and

reset the pin in one of the holes to the

left

of the pre

vious setting. This resetting of the pin will produce
less tension at zero. Repeat this process until the

minimum desired tension is obtained. On the other

hand, should there be insufficient tension at zero,
press in the dial and reset the pin in one of the holes
to the

right

of the previous setting, repeating this pro

cess until the minimum desired tension is obtained.

If Correct Stitching is Not Obtained:

If the bobbin thread tension has been disturbed,

or a correct stitch cannot be obtained without a

very heavy or very light needle thread tension, then

the following procedure is recommended:

Using No. 50 thread in the needle and on the bob

bin, adjust the needle thread tension as instructed

above. Then turn the tension thumb nut to “3”

and, with two thicknesses of thin material in the
machine, adjust the

bobbin thread tension,

as in

structed on page 21, until the stitch is correctly

locked in the material as shown in Fig. 15.

A wide range of materials and threads can now be

accommodated without further adjustment of the

bobbin thread tension.