| 摘要 |
Textile apparatus for reducing the unevenness in textile slivers. A card feeds sliver to a sensing device which detects any thickness variations and, through a draft control device, controls a variable speed motor which drives one of two pairs of drafting rollers, the other pair of which is driven at a substantially constant rate, the difference in speed between the pairs serving to draft the silver and also reduce the unevenness. An intermediate sliver storage device is located either (1) between the drafting rolls and the sliver coiler means which feeds the sliver into a can, or (2) between the card and the sliver sensing device. Photoelectric detecting means monitors the level of the sliver in the storage device and controls a second variable speed motor which, in the first modification drives the sliver coiler means, and in the second modification drives the card to maintain substantially constant the sliver level in the storage device. Either pair of drafting rolls may be variably driven, and each pair is provided with a tacho-generator to monitor its speed, the two tacho-generators operating in the event of any variation in the speed of the normally constant speed rolls to further vary, through the draft control device, the speed of the variable speed rolls to compensate for any erratic variation in the constant speed rolls. The second variable speed motor is controlled by varying the field current which effects a more gradual speed change and is advisable because of the high inertia of the card and the sliver coiler means.
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