Instruction manual

6.2 Adjusting the needle-thread tension

Pre-tensioner

When the main tensioner 2 and supplementary tensioner 3 are open

(e.g. when the sewing feet are raised) the needle thread must be

under slight residual tension. This residual tension is produced by the

pre-tensioner 1.

The pre-tensioner 1 simultaneously affects the length of the end of the

severed needle thread (the starting thread for the next seam).

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Basic setting:

Tur n knurled nut 4 until its front is flush with the bolt 5.

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To shorten the starting thread:

Tur n knurled nut 4 clockwise.

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To lengthen the starting thread:

Tur n knurled nut 4 counterclockwise.

Main tensioner

The main tensioner 2 should be set to the minimum possible t ension.

The looping of the threads must be in the center of the material.

With thin material excessive thread tension can cause unwanted

gathering and thread breakage.

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Adjust the main tensioner 2 so that the stitches are uniform.

To increase tension: turn the knurled nut clockwise

To decrease tension: tur n the knurled nut anti-clockwise

Supplementary tensioner

The supplementary tensioner 3 can be switched in to effect a rapid

change in needle-thread tension during operation (e.g. with thickened

seams).

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Set the supplementary tensioner 3 lower than the main

tensioner 2.