Class 99 & 99K
line. A few stitches should now be made in the material and then examined to
see if the stitch is properly locked in the material. If the bobbin thread shows on
top, the tension on the bobbin thread should be increased. If the needle thread
shows on the bottom, the tension on the bobbin thread should be decreased. A
wide range material and threads can now be accommodated without further
adjustment of the bobbin thread tension.
Any change in tension, required to obtain a proper stitch to suit different materials
being sewn, can be made by a slight adjustment of the tension on the needle
thread only.
To Clean the Stitch Forming Mechanism
After considerable use, the stitch forming mechanism of the machine may
become clogged with lint and this may interfere with the perfect operation of the
machine. Occasionally remove the bobbin case from the machine, according to
the following instructions, and remove any lint, etc., which has accumulated in
the machine.
To Remove the Bobbin Case
Operator Being at the Front of the Machine.
Raise the needle to its highest position
by turning the hand wheel over toward
you. Draw the slide plate AA, Fig. 31
slightly to the left, then lift its right hand
end and draw it toward the needle until
it is disengaged form the spring BB in
the bed of the machine.
Fig. 31 Slide Plate Removed
Page 26
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