Medion LIFE SM60 Manual De Instrucciones página 221

9.4. Checking the thread tension
9.4.1. Correct stitching
The correct setting of upper and bobbin thread tension is achieved when
the interlacing of the threads is in the centre of the fabric.
The fabric remains smooth and does not pucker.
9.4.2. Incorrect stitching
The upper thread is too tight and pulls the bobbin thread up. The bobbin
thread is visible on the upper fabric layer.
Solution:
Reduce the upper thread tension by turning the upper thread tension reg-
ulator to a lower number.
Upper thread is too loose. The bobbin thread pulls the upper thread down.
The upper thread is visible on the underside of the fabric layer.
Solution:
Increase the upper thread tension by turning the upper thread tension reg-
ulator to a higher number.
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