SINGER CLASS 99 User Manual download pdf (Page 26)

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

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SINGER CLASS 99 User Manual Page 26