Bedienungsanleitung Brother AS-40 (Seite 87 von 100) (Englisch)

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Incorrect thread tension

■ Symptoms

• Symptom 1: The lower thread is visible from the upper side of the fabric.

• Symptom 2: The upper thread appears as a straight line on the upper side of the fabric.

• Symptom 3: The upper thread is visible from the lower side of the fabric.

• Symptom 4: The lower thread appears as a straight line on the lower side of the fabric.

• Symptom 5: The stitching on the lower side of the fabric is loose or has slack.

■ Cause/remedy/check details

 Cause 1

The machine is not correctly threaded.

The lower threading is incorrect.

Return the upper tension-control dial to “4”,

and then refer to “Upper thread tightened up”

(page 81) to correct the threading.

<With symptoms 3 through 5 described

above>

The upper threading is incorrect.

Return the upper tension-control dial to “4”,

and then refer to “Tangled thread on wrong

side of fabric” (page 82) to correct the upper

threading.

 Cause 2

A needle and thread appropriate for the

fabric are not being used.

The sewing machine needle that should be

used depends on the type of fabric sewn and

the thread thickness.

If a needle and thread appropriate for the

fabric are not being used, the thread tension

will not be adjusted correctly, causing

wrinkles in the fabric or skipped stitches.

• Refer to “Needle types and their uses”

(page 28) to check that a needle and thread

appropriate for the fabric are being used.

 Cause 3

An appropriate setting on the upper tension-control dial is not selected.

Turn the upper tension-control dial to select an appropriate thread tension.

The appropriate thread tension differs according to the type of fabric and thread being used.

* Adjust the thread tension while test sewing on a piece of scrap fabric that is the same as that used in

your project.

Note

● If the upper threading and lower threading are incorrect, the thread tension cannot be adjusted

correctly, even by turning the upper tension-control dial. Check the upper threading and lower

threading first, and then adjust the thread tension.

• When the lower thread is visible from the

upper side of the fabric. Turn the upper

tension-control dial to a lower number

(toward the left). (Loosen the thread tension.)

• When the upper thread is visible from the

lower side of the fabric. Turn the upper

tension-control dial to a higher number

(toward the right). (Tighten the thread

tension.)

 Symptom 1  Symptom 3

a Lower side of fabric

b Lower thread visible from

upper side of fabric

c Upper thread

d Upper side of fabric

e Lower thread

f Upper thread visible from

lower side of fabric

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Brother AS-40 Seite 87

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