Patent GB-275769-A (GB)
Title: Improvements in doffing apparatus for spinning, doubling, twisting and like machines
IPC: D01H9/04
Filed: 1926-07-06
Abstract: 275,769. Fairbairn, Lawson, Combe, Barbour, Ltd., and Moorhouse, S. July 6, 1926. Doffing arrangements; drag arrangements; brake arrangements; thread-severing arrangements.-In doffing-apparatus for flyer spinning, doubling, twisting, and like machines of the kind described in Specification 110,222 the lifter shaft actuates mechanism whereby the empty bobbin holders are retracted from the position they occupy beneath the spindles during spinning to allow the lifter plate to be lowered, are advanced to displace the full bobbins from the lifter plate, again retracted to allow the lifter plate to carry the empty bobbins into the spinning position, and are finally advanced to the position beneath the spindles. In connection with this mechanism means are provided for adjusting the drag cords, aligning the flyers, clearing the spindles of coils of yarn, severing the threads, removing any of the spindle-brakes that have been applied in the previous spinning operation, and adapting the full bobbin receptacle to serve as a platform or stand for the operative. The lifter shaft 8 is normally operated from the lifter mechanism by a chain pulley 7 loose thereon but adapted to be coupled to a fast wheel 9; during doffing the wheel 7 is disconnected and the shaft 8 operated by the wheel 11. Cams 16, 17, 18, on the shaft 8 respectively effect the aligning of the flyers, the stripping of the yarn from the spindles and the operation of the empty bobbin-holder arms 18<e> which push the full bobbins from the lifter plate into the receptacle 20, and suitably dispose the empty bobbins so that they may be engaged by the lifter plate and spindles. A bar 16f is provided with inclines to engage the legs of the flyers and is operated by a lever 16<a> engaged by the cam 16. Fingers 17<g> to span each spindle are mounted on a square shaft 17f, which is freely mounted on a lever 17<e> operated by the cam 17, and is provided with an arm which engages a cam on the frame of the machine so that the fingers 17g extend horizontally as they pass over the spindles to strip the yarn therefrom when the lever 17e is operated. The empty bobbins ara carried by gapped and flanged holders 18g, which are provided with extensions 18h and are mounted on the arms 18<e>. The arms 18<e> are withdrawn from the position shown in full lines in Fig. 15 to that shown in dotted lines to allow the descent of the lifter rail, and are then advanced to push the full bobbins into the receptacle 20. When the direction of rotation of the shaft 8 is reversed. the empty bobbins are engaged and lifted on to the spindles by the lifter rail and the arms 18<e>, are retracted to allow the passage of the lifter rail, and finally advanced to their initial position. The bars that carry the drag cords are adjusted automatically during spinning by known worm and ratchet devices, and are provided with a bowl 19<a>, Fig. 1, which, during spinning, moves freely in the upper part 19<d> of a cam plate, but, when the lifter plate is lowered for doffing, is engaged by the groove so that the cords are withheld from the bobbins. After a few turns have been wound upon the empty bobbins when the parts have been returned to their normal spinning position, the yarns extending from the full bobbins and engaged in cross grooves in a bar 21 are severed by running a knife along a longitudinal groove. A rod is mounted longitudinally of the machine and above the handles of the spindle brake and coupling mechanisms, and is so connected with the stop rod and lever 40 of the machine that it is moved when the machine is stopped to release any of the brakes that may be applied so that the flyeraligning mechanism may readily operate. The bobbin receptacle 20 is connected by a rod 46 to a hand lever by which it is turned into the position shown in dotted lines in Fig. 13 to serve as a platform or stand for the operative. The Provisional Specification describes one set of cam-operated devices for removing the full bobbins and another set for supplying empty ones, the operating cam being driven through a lost motion connection; two co-operating notched cutting-bars operated by a lever so that they move in opposite directions; and a cam and compound rack and pinion mechanism to release the drag cords.