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4. Thread tension
4.1 Needle and bobbin-thread tension
The thread tensions depend on the type and quality of the yarn and
material. The thread tension should be the minimum at which the
appearance of the buttonhole is satisfactory.
With thin material excessive thread tensions may cause unwanted
gathering and thread breakage.
Upper-thread tension
The upper-thread tension must generally be set higher than the
bobbin-thread tension. The upper-thread tension consist of two
components the main tension for the sewing process and a residual
tension to keep the upper thread taut for the cut beneath the throat
plate.
The upper thread hanging out of the needle must be long enough to
ensure that the first stitch is securely executed. The residual tension
required to achieve this depends on the elasticity of the upper thread
used.
Adjust the main tension for the sewing process with the knurled
nut 1.
Adjust the residual tension to keep the upper thread taut when it is
cut with the sleeve 2.
If the residual tension is changed the main tension should be
corrected accordingly.
NB:
Adjusting the thread clamp 4 does not alter the upper-thread tension.
Only the clamping force can be adjusted on the thread clamp.
Bobbin-thread tension
Swing the head up.
Adjust the bobbin-thread tension with the tensioner 3.
Swing the head down.
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