Replacing the bobbin case, Adjusting bobbin-thread tension – SINGER 4022 User Manual

Page 17

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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
bin case.

» Close hook cover or slide

plate. Be sure thread does not
get caught when hook cover is


Adjusting Bobbin-Thread


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

scrap fabric.

® 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


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