Operation
18 Operating Instructions 513/533 - 01.0 - 09/2023
The needle thread regulator (1) regulates the amount of needle
thread required for forming the stitch. An optimum sewing result
is possible only when the needle thread regulator is exactly
adjusted.
With the correct setting the needle thread loop must slide over the
thickest part of the hook at low tension.
To adjust the needle thread regulator:
1. Loosen screw (3).
2. Change the position of the needle thread regulator (1).
Needle thread regulator to the left = larger amount of needle
thread
Needle thread regulator to the right = smaller amount of needle
thread
3. Tighten the screw (3).
Adjustment note:
When the maximum thread quantity is required, then the thread
tensioning spring (2) must be pulled approx. 0.5 mm down from
its upper end position. This occurs when the needle thread loop
passes the maximum hook diameter.
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