| 摘要 |
In a loom or warping system, a safety arrangement is provided for operating machine-stopping or detecting means whenever a thread breaks. To this end, the sheet of parallel threads is constrained to pass over a braking member, in practice between frictionally acting parallel transverse bars, so that upon breaking of a thread beyond the braking member, said thread may continue progressing to the rear of and towards the latter by reason of the driving action of the adjacent threads. The broken thread gathers thus into a ball adjacent the braking member on the path of a pencil of light grazing the sheet of threads just before it reaches the braking member and sent out by a source of light towards a photo-cell releasing an alarm or the like mechanism whenever a thread breaks. The source of light and photo-cell are advantageoulsy rigid with the braking member so as to make the operation independent of the vibrations of the loom, warping system or the like machine.
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