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3.5 Regulating the Needle Thread Tension
Pre-tensioning for Thread Trimming
For the sure functioning of the thread trimming with
opened main tension 4 a small residual tension of the
needle thread is required.
This residual tension is achieved by pre-tensioning 3. At
the same time it influences the length of the cut needle
thread end. (Starting thread for the next seam.)
Short starting thread = tighten the knurled nut 3.
As base position applies:
Front of the knurled nut and bolt flush.
Greater adjustments of the pre-tensioning makes a
readjustment of the main tension necessary.
Main tension
Pre-tensioning 3 and main tension 4 should give the
recommended needle thread tension of e.g. 80g.
Set the main tension 4 accordingly.
3.6 Thread Regulator
With the thread regulator 6 the needle thread quantity
required for stitch building can be regulated. The setting
is dependent on stitch length, material thickness and
thread characteristics.
Note:
Only a precisely set thread regulator assures an optimal
sewing result.
The needle thread loop should glide over the hook
without excess and with little tension.
Loosen screw 9 and set the regulator accordingly.
The vertical wire 7 serves as a setting aid in conjunction
with the scale 8.
45
987
6
17
15


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