| 摘要 |
<p>Device for the control and stopping of a sewing machine, comprising at least one pulley (15) driven into rotation by one of the sewing threads (controlled thread) and a disc (20) connected to said pulley. A plurality of reference elements (21) on the disc and an external sensor (24) make possible accurate measurement of the pulley's rotating speed, which is proportional to the consumption of the thread under control. Said speed is compared by an electronic circuit (26) with two extreme selectable preset values to stop operation of the machine when the speed deviates from preset limits. In this way, a total control is obtained over all the sewing anomalie such as: breakage of the top needle thread, breakage of the crochet or shuttle bottom thread, skipping of stitches, anomalous tension of the threads.</p> |
