Apparatus for controlled braking of a driven yarn engaging roll
AssigneeMcCoy-Ellison, Inc.
InventorsJohn F. Hagewood, Julius Darigo, Bruce S. McCoy, John M. Single
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Abstract
In a textile draw warping system having independently driven sets of draw rolls and an independently driven warp beam, synchronous braking of the driven components is controlled by individual pneumatic brakes at each driven component operated by a central programmable logic control system to brake the driven components at respective rates of deceleration preset to maintain constant speed ratios between the driven components during braking. Auxiliary control of dynamic braking and driving of the several drive motors corrects deviations in the driven components' predetermined rates of deceleration.
Claims8
In a textile draw warping system having a first set up upstream guide rolls driven by a common first drive means and a second set of downstream guide rolls driven by a common second drive means at a greater surface speed than said first set of rolls for drawing a plurality of synthetic continuous filaments traveling peripherally in sequence over said rolls, apparatus for controlled braking of said first and second sets of rolls, said apparatus comprising:
- (a) a plurality of fluid actuated braking means each respectively associated with one of said rolls,
- (b) a plurality of adjustable valve means each respectively associated with one of said braking means for individually supplying a pressurized operating fluid to each said braking means at independently selectively variable pressures for generation of a correspondingly variable braking force by each said braking means,
- (c) first means for detecting the common speed of said first set of rolls,
- (d) second means for detecting the common speed of said second set of rolls, and
- (e) braking program means including:
- (i) primary control means for individually controlling adjustment of each said valve means for controlling the pressure at which the pressurized operating fluid is supplied respectively to each said braking means for individually controlling deceleration of each said roll of said first set in a common predetermined relationship of decreasing roll speed to elapsed time of actuation of said braking means and for individually controlling deceleration of each said roll of said second set in another common predetermined relationship of decreasing roll speed to elapsed time of actuation of said braking means related to said common relationship of said first set of rolls for maintaining a predetermined ratio between the common speed of said first set of rolls and the common speed of said second set of rolls during braking, and
- (ii) auxiliary control means independently responsive to each said first and second detecting means for independently controlling dynamic braking and driving of said first and second drive means in conjunction with said plurality of fluid-actuated braking means for independently correcting deviations in the detected common speeds of said first and second sets of rolls from their respective said common speed-to-time relationships.
Dependencies are inferred from the claim text.