SINGER W1640 User Manual
Page 18
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If you are unable to balance the stitch by adjusting tension on the
upper thread, you may have to make a slight adjustment in the
bobbin tension.
Take out bobbin case, remove bobbin and clean out any dust or lint
which has collected around the case.
Turn screw on bobbin case slightly in either direction using the small
screw-driver (Fig. 24):
To increase tension - turn screw slightly to the right (clockwise).
To decrease tension - turn screw slightly to the left (counter
clockwise)
If stitch is satisfactory but the seam is puckered, it may be necessary
to loosen tension on both top and bottom threads.
CHECKING TENSION OF LOWER THREAD
CHECKING TENSIONS
An easy test for checking tension balance:
Fold fabric on the bias and stitch (12 stitches/inch) ’/
2
” in from
fold.
Grasp stitching and pull with a snap to make threads break
(Fig. 25)
•
if both threads break (even though not at the same place) —
tensions are balanced.
•
if upper thread breaks — loosen top tension.
•
if lower thread breaks — tighten top tension.
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