Drafting apparatus with autolevelling
AssigneeHollingsworth (U.K.) Limited
InventorsWalter Haworth, Alfred Wood
Life of this patent
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Abstract
A drafting system and autoleveller are arranged such that the "tongue" roller and the "grooved" roller of the sliver sensor ahead of the first drafting rollers serve to measure the thickness of the sliver therebetween, and their output signal is used, subject to a time delay, to vary the draft ratio in the subsequent drafting means. The autoleveller throughput speed is adjustable and the time delay in the draft ratio variation is automatically adjusted in response to the speed selected.
Claims11
Carding apparatus including means converting a carded web into a sliver, and drafting apparatus drafting the converted sliver, said drafting apparatus comprising:
- (a) driven drafting means comprising drafting rollers defining a series of drafting nips;
- (b) an autoleveller for controlling the draft ratio of said driven drafting means, said autoleveller including:
- (ba) a sliver sensing system for encountering the sliver before the drafting nips;
- (bb) means for adjusting the sliver speed at at least one of said drafting nips, for controlling the draft ratio of said drafting nips in response to a signal from said sliver sensing system;
- (bc) adjusting means for adjusting the operating speed of said drafting apparatus;
- (bd) time delay means for ensuring that an appropriate correction drafting adjustment is effected by said draft ratio controlling means when the sensed part of the sliver is passing said at least one drafting nip;
- and
- (be) means responsive to said adjusting means for varying the time delay effected by said time delay means;
- wherein:
- (bf) said time delay varying means are responsive to said adjusting means and effective to define a variable time delay as the arithmetic difference of a first component inversely proportional to the operating speed selected and a second component which is a constant.
Dependencies are inferred from the claim text.