Barudan BEXS, Instruction Manual

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4.
As the needle continues to rise, the point of the hook pulls the loop of thread
down. This enlarges the loop.
5.
The upper thread encircles the bobbin thread, forming a knot.
6.
The knot is then drawn into the fabric by the take-up lever. The knot is tightened
by the upper and lower tensions. The needle reaches its highest point and begins
the downward motion, repeating the entire process.
Important Conditions For Forming Stitches
• The hook must approach the thread loop at the correct moment.
• The hook must pass within a given distance of the needle.
• The needle must be at the correct height.
Tension Adjustments
Top Thread Tensions
Tension is the tautness of the thread as stitches are formed. There are two tensions to be
considered when making adjustments. The top thread, is controlled by the top tension (small
pretensioner, large top tensioner); and the bobbin thread, located in the bobbin case, is
controlled by the bobbin tension. These tensions determine the quality of the embroidery.
Factors such as the type of material you are using, the tightness of the fabric in the hoop, the
backing used, the size and style of lettering, and the type of thread being used will all play a
part in setting the proper tensions.
The top tension and bobbin tension work together to form stitches, but they are adjusted
separately. Tension should be set to allow 33% bobbin thread to show on the reverse side of
the embroidery. For example, if the bobbin thread is white and the top thread is blue, the
underside view of the stitch will be white in the center, representing one third of the total
stitching, and the outside edges will be blue, representing two thirds of the total stitching.
An excellent way to test the tensions is by using an
H
or
I
test.
Turn the sample over and look at the back of the stitching. Proper tension would show two
thirds top thread color and one third bobbin thread. Barudan supplies several sew test designs
on a CF card for new machines.
X
Series Mechanical Guide 1-19