Kompernass KH 4001 manual Lower thread tension has been preset in the factory

Upper thread tension is too low:

Loops are visible on the bottom of the fabric.

➩Increase the tension of the upper thread by turning the upper thread tension selector 2 to a higher value.

Notice

The lower thread tension has been preset in the factory,

ensuring that it is appropriate for general use. Hence, no changes in the setting are required for the majority of sewing tasks.

However, if you are sewing fine fabrics with thin thread, it could happen that the correct adjustment of the thread tension will not adjust automatically by means of the setting of the upper thread tension. Hence the user can readjust the lower thread tension in accordance with the procedure described below.

Lower thread tension is too low

Small loops are visible on the surface of the fabric.

➩First reduce the (upper-) thread tension, setting a lower value by turning the upper thread tension selector 2. If this does not lead to satisfac-tory sewing results, even when the upper thread tension is set at the lowest possible value, change the upper thread tension on the spool as described below.

Spool

➩Increase the tension of the lower thread at the bobbin, using a small screwdriver Y to turn the screw on the pressure tab of the bobbin case in a clockwise direction. The screw should not be turned by more than one complete rotation.

➩Do not forget to turn the screw back into its original position before you recommence sewing!

Correct thread tension

The correct thread tension is important, as a tension that is too high or too low will lead to a weakening in the strength of the seam and often also results in a rippling of the fabric surface in the vicinity of the seam.

To fabrics being sewn		Needle	Strength of thread
		sizes
	• fine tricot fabrics
	• Lace		• Cotton thread: 80
Very fine	• Fine linen
		9	• Man-made thread
fabrics	• Silk
			• fine, mercerised cotton
	• Organza
	• Chiffon
	• Voile		• Cotton: 60–80
Light-	• Taffeta
			• Sewing silk: „A“
weight	• Synthetic fabrics	11
			• Man-made thread
fabrics	• Silk
			mercerised: 50
	• Batiste
	• Cotton
	• Gingham
	• Poplin	14
	• Percale
		(as is
	• Pique		• Cotton: 50–60
Medium		sup-
	• Satin		• Sewing silk: „A“
heavy		plied
	• Velvet		• Man-made thread
fabrics		with the
	• light woolen fabrics		mercerised: 50–60
		machi-
	• Fine corduroy
		ne)
	• Suiting materials
	• Linen
	• Muslin
	• Denim
	• Gabardine		• Cotton thread: 40–50
	• Tweed
Heavy		16	• Mercerised:
	• Corduroy
			„high-strength”
	• Canvas
	• Sailcloth
	• Simple weave	14
Knitted	• Double weave	(with	• Cotton polyester
fabrics	• Jersey	tricot	thread
	• Tricot fabric	border)

Notice

1.Select the right needle size and thread strength according to the table above!

2.As a rule use the same thread strength for the upper thread (spool of thread) and the lower thread (bobbin)!

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