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Preparation - Sewing
Thread Tension
The Basic Setting
is indicated when the red line on the tension adjustment wheel is in line with
the marking A
the tension does not need adjusting for normal sewing work
for special sewing work, the tension can be adjusted to suit the fabric
Perfect Stitch Formation
the interlooping of the threads is in the fabric
Upper thread tension too tight
the lower thread is pulled more up, i.e. to the right side of the fabric
to reduce the upper thread tension turn tension adjustment wheel to 3-1
Upper thread tension too loose
the upper thread is pulled more down, i.e. to the wrong side of the fabric
to increase the upper thread tension turn tension adjustment wheel to 5-10
Optimal upper thread tension is set in the factory. For this, Metrosene
threads 100/2 weight (Mettler, Switzerland) are used in the bobbin and
also in the upper thread.
The tension may vary when using other types of thread such as embroidery
thread, and it may therefore be necessary to adjust the tension to suit the fabric
and stitch type.
For example:
Tension Needle
Metallic thread approx. 3 90
Monofilament approx. 2-4 80
Stitch Plate
Stitch Plate Markings
the stitch plate is marked with vertical, horizontal and diagonal lines in mm
and inches
the lines help to guide the fabric for sewing seams and precise topstitching,
etc.
the horizontal markings are helpful for sewing corners and buttonholes, etc.
the diagonal markings are useful for quilting
the vertical measurements correspond to the distance between the needle
and the line
needle insertion point is position 0 (center needle position)
the measurements are marked to the right and left, measuring from the
center needle position
Removing the Stitch Plate
raise the presser foot and needle
power switch to «0» (off)
press the stitch plate down at the right back corner B until it flips up
remove the stitch plate
Replacing the Stitch Plate
place the stitch plate over the opening A and press down until it clicks into
place
A
B
A
033301.71.04_2014-02_Manual_B330_B350_PE_B380_EN
19


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