SINGER W1640 User Manual
Attention! The text in this document has been recognized automatically. To view the original document, you can use the "Original mode".
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
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
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
An easy test for checking tension balance:
Fold fabric on the bias and stitch (12 stitches/inch) ’/
” in from
Grasp stitching and pull with a snap to make threads break
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.