Bernette Airlock b64 - Adjusting the Thread Tension; Adjusting the Differential Feed

Machine settings
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2020-09 EN 5040064.00A.04
6.7 Adjusting the thread tension
The Thread Tension has a considerable influence on each individual thread and its task to perform the stitch
formation. The Stitch Chart provides a recommended default value for each stitch. This recommendation can
be optimized for different thread/fabric combinations. (see page62)
> To reduce the Thread Tension, turn the Thread Tension Adjustment Dial of the corresponding threads
down to a lower value.
> To increase the Thread Tension, turn the Thread Tension Adjustment Dial of the corresponding threads
down to a higher value.
6.8 Adjusting the Differential Feed
The Differential Feed prevents unwanted puckering or wavering in knitted or stretch fabrics as well as
shifting of fabric layers. The setting values describe the ratio of movement of Front Feed Dog relative to the
Rear Feed Dog. With default value 1, both Feed Dogs move at the same speed.
> Adjust the feeding ratio of the two Feed Dogs by using the Differential Feed setting.
Value Fabric Result
2 Fine, soft fabrics Ruffling, puckering, gathering
1.5 Jersey, sweatshirt, knits Slight ruffling, preventing seam waving
1 Wowen knit and medium weight dense
fabric.
Default value
0.6 Fine nylon tricots, densely woven fabric,
lining, satin
Stretching, preventing seam puckering