Method and device for sewing machine
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United States of America Patent
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Issued Date -
Oct 25, 2007
app pub date -
Apr 12, 2007
filing date -
Apr 13, 2006
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A sewing machine for stitching thread with several colors according to a sewing pattern stored in the form of stitch data in a memory, where the thread is dyed by a mechanism for dyeing the thread and where the upper thread is fed to a needle by a thread feeder. The thread consumption per stitch is calculated by a control unit from the data. The thread feeder is controlled by the control unit so that for each step it advances the calculated thread consumption for the stitch. A thread consumption for the quantity of stitches which according to the sewing pattern remains between the sewing material and the next color change for the upper thread in the sewing pattern is calculated by the control unit, whereupon the dyeing mechanism is controlled by the control unit to initiate the dyeing of the upper thread with the next color at a time when the calculated thread consumption is equal to the length corresponding to the length of the actual upper thread remaining between the sewing material and the dyeing point in the dyeing mechanism.
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