| 摘要 |
PCT No. PCT/CH85/00125 Sec. 371 Date Mar. 24, 1987 Sec. 102(e) Date Mar. 24, 1987 PCT Filed Aug. 27, 1985 PCT Pub. No. WO87/00562 PCT Pub. Date Jan. 29, 1987.To measure the tension in a set of threads (10) or a warp (11) in a loom or the like, a vibrating device (20) which is rotatable about an axis (23) is moved into the vicinity of the web of material so that the material is thereby slightly deflected from its straight line course. The vibrating device (20) is set into oscillating movement by an excitation device (30). The frequency (fo) at which the vibration of the device (20) becomes established is directly dependent upon the tension P in the group of threads or the fabric, and this tension can therefore be determined from the frequency fo. The vibrating device (20) may also be set into its intrinsic vibration at an intrinsic frequency fo simply by the threads (10) or fabric (11) gliding over its surface (24), and this frequency can be measured by means of a sensor (34) and transducer (35). A particularly advantageous construction of the vibrating device (20) consists of a plate with a notch (26) lying on a knife edge (27). The intrinsic vibrations of the vibrating device (20) may be eliminated by equipping the vibrating device with a counterweight (25) which shifts the center of gravity of the system to the point of intersection of the lines of tension exerted by the set of threads or fabric.
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