| 摘要 |
PCT No. PCT/EP89/00472 Sec. 371 Date Jan. 9, 1991 Sec. 102(e) Date Jan. 9, 1991 PCT Filed Apr. 28, 1989 PCT Pub. No. WO89/12124 PCT Pub. Date Dec. 14, 1989.A thread monitoring arrangement for monitoring sewing thread at different areas along the path of the thread inducing a switching process for signalling or stopping the sewing process upon the occurrence of thread disturbance. The thread monitoring arrangement includes first sensor units positioned in an area between a thread reserve and an associated tensioning device. Second sensor units are provided in the area between the tensioning device and the associated stitch formation site for sending signals in the case of thread disturbance. A monitoring switching arrangement is provided, evaluating signals from the sensor units differently to induce different switching processes, either alerting the operator or stopping the sewing process, after a predetermined time or immediately.
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