Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1978-03-09
1980-03-25
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
112278, 235 92CM, 235 92PE, 242 57, B65H 6302, G08B 2900
Patent
active
041952928
ABSTRACT:
A programmable bobbin thread detector which generates a signal when the amount of thread remaining on a bobbin is sufficient to complete only one more seam. At the beginning of each operation, the operator sews a complete seam with a full bobbin and the number of bobbin revolutions are stored in a first counter. The operator then fills a new bobbin. Each turn of the bobbin during the winding operation is detected and increments a second counter until its contents correspond to the total number of thread revolutions on the new bobbin minus the number of revolutions necessary to complete one seam. The complement of this number is loaded into a third counter. During subsequent sewing operations using a new bobbin, a third counter is incremented with each revolution of the bobbin, and an alarm is generated when the third counter reaches a predetermined state.
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Caldwell Sr. John W.
Nowicki Joseph E.
Weiss Harry M.
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