131 (#185) ############################################ WOOLLEN YARN SPINNING in the carriage at the variable speed required, viz. slowly at the start, quickly for centre of traverse, and slowly as the carriage comes to the position for stopping and starting its outward traverse again.* The starting control of this action must obviously come from the faller-wire, the locking of this on to the runner upon the copping shaper-rail withdrawing the “stop which has been holding the shell from contact with the scroll shaft. A rod, not perceptible in the diagrams, also controls shell H, thus preventing running-in if it is desired so to do. (h) The faller-wire traverse, the weighting of the counter faller-wire, and the turning of the spindles during the running-in of the carriage are designed to so control the yarn that if cops are being formed a sound, firm cop is built up, or if weft-bobbins are being employed the yarn is satisfactorily wound upon these. The up-and-down action of the faller-wire is controlled by the copping shaper-rail upon which runs the anti- friction wheel or runner, which is now directly connected with the faller-wire. This copping shaper-rail must be shaped to give, in conjunction with the turning of the spindle, the desired traverse to the thread, and must actually be permanently lowered as the cop is built up higher and higher on the spindle, equally distri- buting the thread from the large circumference of the cop or spool and back quickly to the nose again, or, say, quickly to the bottom and then slowly to the nose. The control of the revolutions of the spindle to build the cop or spool as required is effected by the quad- rant through the chain which is coiled round the drum or scroll connected with the tin-roller shaft. The action A simple harmonic motion is here required, both for smooth running-in of carriage and for the least power-consumption in effecting this running-in. 131
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