Replacing the bobbin case, Adjusting bobbin-thread tension – SINGER 4022 User Manual
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Replacing the Bobbin Case
1. Hold bobbin case by latch, with
about 7.5 cm (3 inches) of thread
leading off top of case,
2. Align protruding finger A with slot
B and slide case on the stud C.
® Release the latch and push
case until it clicks into place.
Allow 7.5 cm (3 inches) of
thread to hang free from bob
» Close hook cover or slide
plate. Be sure thread does not
get caught when hook cover is
The bobbin-thread tension has been
set at the factory for most types of
stitching. You may wish to adjust
the bobbin-thread tension when
straight stitching on fine fabrics or
to balance an open zig-zag stitch.
Bobbin and needle threads lock at
the corner of each stitch when a zig
zag stitch is balanced. To adjust the
bobbin-thread tension, follow the
procedure below using two layers of
® Raise the presser foot.
® Raise needle to highest position
by turning the hand wheel toward
® Open hook cover or slide plate
and remove the bobbin case as
instructed on page 14.
® Slowly turn screw D to the left or
right, using the small screwdriver
in your accessory box, until
® When stitching is completed, turn
screw D to the right or left back to
original position, for all other