!CONTROLS

THREAD TENSION CONTROL

STRAIGHT STITCHING

The good looking appearance of your stitching is largely determined by the balanced tension of both top and bobbin threads. The tension is well balanced when these two threads 'lock' in the middle of layers of fabric you are sewing.

For most fabrics the top.thread tension (;ontrol should be set in the white zone between 3 and 5.

If, when you start to sew, you find that the stitching is irregular, you will need to adjust the tension control.

Make any adjustments with presser foot 'down'.

. If the threads are locking on the top surface with the top thread lying flat, the top stitch is too tight. Tension can be decreased by turning the tension control to the left (lower numbers).

. If the reverse is happening with the threads on the underside of the fabric, the tension is

too loose. This can be corrected by turning the tension control to the right (higher numbers).

ZIGZAG STITCHING

The top thread may appear on the bottom depending on the thread, fabric, type of stitch and sewing speed, but the bobbin thread must never appear on the top of the fabric.

In the case of zigzag stitching, the wider the zigzag setting, the more chance there is of

puckering. If this occurs decrease the top tension slightly and/or reduce the zigzag width.

BOBBIN THREAD TENSION

The bobbin thread tension has been correctly

set at the factory, so you do not need to adjust it.

STRAIGHT STITCHING

Under

side

Nell balanced

Top

sideo

Kenrnol'e

Decrease Increase -----=

tension tension

Top stitch

Top stitch

too tight

too loose

ZIGZAG STITCHING

MORE TIPS ON THREAD TENSION

A perfect stitch is obtained when the tension is well balanced, but the tension balance may

vary according to the type and size of needle, thread and fabric. The fabric determines size of

thread and needle. The presser foot pressure and the thread tension control should also be

adjusted properly.

FABRICS:

Heavy fabrics, stiff Increase top thread tension. Use larger size needle, heavier thread and longer stitch length.

BALANCE

Heavy fabrics, soft- Decrease top thread tension. Use longer stitch length.

Light, sheer fabrics - Decrease top thread tension and presser foot pressure. Use shorter stitch length. Sew slowly.

THREADS:

Polyester and silk - Decrease top thread tension. Nylon - Increase top thread tension,

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Kenmore 17922, 17920 manual Thread Tension Control, More Tips on Thread Tension, Balance

17922, 17920 specifications

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