Checking The Thread Tension - Medion MD 17187 Bedienungsanleitung

5.1.3. Checking the lower thread tension
The easiest way of checking the lower thread tension is by sewing a medium
zigzag stitch on the fabric in question.
Use the appropriate needle (26) and threads.
You can get a clearer picture by using different colours for the upper and low-
er threads.
Now sew a few zigzag stitches.
The thread tension is correct if the lower threads are not visible on the top sur-
face of the fabric.
Make sure that you always sew even stitches (see adjacent diagram).

5.2. Checking the thread tension

5.2.1. Correct seam
The tension of the upper and lower thread should be sufficient to ensure that
the threads interlace in the middle of the fabric.
The fabric remains smooth and does not pucker.
5.2.2. Incorrect seams
The upper thread is too tight and pulls the lower thread up. The lower thread
is visible on the upper fabric layer.
Solution:
Reduce the upper thread tension by turning the upper thread tension regula-
tor (3) to a lower setting.
Upper thread is too loose. The lower thread pulls the upper thread down. The
upper thread is visible on the underside of the fabric layer.
Solution:
Reduce the upper thread tension by turning the upper thread tension regula-
tor (3) to a higher setting.
In both cases in which the seams are incorrect, you may also need to adjust
the lower thread tension.
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