Abstract
The HMG Etrich Type Auto Chain Gill developed by the Hansatische Motoren Gesellschaft, of West Germany, is primarily intended for processing card slivers and is equipped with an automatic sliver-evening device. The authors have investigated the cheracteristics of this automatic sliver-evening device both theoretically and experimentally with emphasis on its unique time delay element consisting of timer relays.
Results:
1. The sliver-evening device does not respond correctly to a sinusoidal input signal because it skips one signal every 2 or 3 cycles when the period of the sinusoid becomes less than twice the timer setting in the time delay element. It follows, then, that the evening device cannot be expected to attenuate sliver weight variations whose period is less than the value mentioned above.
2. A theoretical investigation has shown that the characteristics of the time delay element is approximately equal to that of a pure time delay within a certain frequency range when there is no hysterisis in its limit switches.
The hysterisis in the limit switches tends to increase the effective time delay at both ends of the frequency range concerned, although it does not prevent the sliver-evening device from effectively attenuating long-term weight variations.
