Butterfly B1501B/T, Operation And Service Manual

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Butterfly B1501B/T - Single Head 15 Needle Embroidery Machine Manual
Step 2/B – When pulling the bobbin thread through the notch, the bobbin should spin clockwise
when looking at the side/top of the bobbin. If it is not spinning clockwise, remove the bobbin and flip it
over.
Step 3 – Pull the bobbin thread through the notch and under the hook located right by the
notch.
Step 4 – Place the thread under the pig tail of the bobbin case. Be sure that the bobbin thread
passes from the bottom opening of the pig tail and exits for the very top and not from the side of the
pigtail.
Step 5 – Pull the bobbin thread out about 6 inches while checking tensions (next section).
Adjust if needed.
Step 5/B – Always check tensions on the bobbin when replacing it. The bobbin lasts
approximately 32,000 stitches. Bobbin tensions might vary from bobbin to bobbin and the tension does
change as the bobbin is used.
2.9.2 Bobbin Thread Tensions
The bobbin thread tension is typically considered much more important that the upper thread
tension because all 12-15 needles depend on the tensions of the bobbin in order to embroidery
properly. It is important to set the bobbin tensions one time and try not to adjust it per color but rather
adjust each other color/needle to conform to the bobbin.
The bobbin tensions might need to be changed when
replacing the bobbin and should be checked regardless.
The operator should check the tensions of the bobbin
after each run by looking at the bobbin of the final
embroidery product for excess or shortage of bobbin
thread. Generally, on a column stitch 1/3 of the column
should be bobbin thread and the other 2/3 upper thread.
Video -
https://www.youtube.com/watch?v=j7L9R22FuNw
An adjuster screw is located on the tension spring. Next to the adjuster screw is a fixed screw
that holds down the tension spring. This fixed screw should never be touched. Tightening (turning
clockwise) will tighten the tension of the bobbin. When tightening the bobbin, less bobbin thread will
show underneath the final embroidered item. Loosening (turning counterclockwise) will lessen the
bobbin tension. When loosening the bobbin, more bobbin thread will show underneath the final
embroidered item. The bobbin tension should be set about the same at the upper thread tension. The
same example of the 3 quarters ($0.75) can be applied. Another way to check tension is to hold the
bobbin thread and drop the bobbin case. The case should fall approximately 1 – 3 inches. If it falls too
far, the tensions need to be tightened. If it falls too short, tensions will need to be loosened. However,
that is only an example and tensions will variate from bobbin to bobbin and from bobbin case to bobbin
case. The only way to set the tension accurately is by eye, based on the final embroidery quality.
Figure 2-12: Bobbin tension adjustment