To regulate the bobbin thread tension – SINGER 15-90 User Manual

Page 23

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When the tension has been correctly set for aver­

age sewing, note the number at the indicator line Q,
so that the tension may be reset should it be altered

for special work or change in size of thread.

To increase the tension, turn the thumb screw A

gradually to the right (clockwise) until the required
tension is obtained. Each higher number denotes
increased tension.

To decrease the tension, turn the thumb screw

A gradually to the left (counter-clockwise) until the
required tension is obtained. Each lower number
denotes less tension.

TO REGULATE THE

BOBBIN THREAD TENSION

The tension on the bobbin thread is regulated by

the screw R, Fig. 11 in the tension spring on the

outside of the bobbin case. To increase the tension,
turn the screw R over to the right. To decrease

the tension, turn this screw over to the left.

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.

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