Patent GB-274301-A (GB)
Title: Improvements relating to doffing motions for spinning, twisting, and like machines
IPC: H01J1/20
Filed: 1926-08-30
Abstract: 274,301. Mackie & Sons, Ltd., J., and Mackie, J. P. Aug. 30, 1926. Doffing-arrangements. - Relates to doffing-mechanism for spinning, twisting, and like machines of the kind in which rows of spindles are provided on separate interchangeable bobbin rails adapted to be moved vertically and horizontally to bring empty bobbins into the spinning position within the flyers and full bobbins into the doffing position, and consists in transferring the empty bobbin rail from a forward position on the moving carriage, by which the rails are moved as necessary during the doffing operations, to a rearward position, by means of mechanism winch is independent of the ordinary building- motion and lifts the rail when it has been moved to a position below or to the rear of the spinning position and maintains it lifted until the carriage has been moved to receive it again. The mechanism is shown in Fig. 1 with the carriage 1 in a forward position and the rail 5a with full bobbin 17<a> disposed between ridges 6<a>, 6<c>, a fresh set of empty bobbins on a rail 5b being in the spinning position. The full bobboins are replaced by empty bobbins 17<a>, Fig. 2, and the carriage 1 is retracted by a pinion 3, and in order to transfer the rail 5a to the rear of the carriage between the ridges 6<b>, 6<c> in readiness for the next doff it is raised by lever arms 11<a>, 11<b> and a cam 15 on a manually operated shaft 19, and lowered when the carriage 1 is advanced to position the space between the ridges 6<a>, 6<c> immediately beneath the then operative rail 5<b>. When the set is complete, the rail 5<b> with the full bobbins is lowered on to the carriage which is then further advanced to the position shown in Fig. 1 to allow the rail 5<a> with the empty bobbins to be raised into the spinning position. The sequence of the operations is shown diagrammatically in Fig. 5, wherein a, band b, c respectively represent the movements of the full bobbins from the spinning position to the advanced position shown in Fig. 1 where they are replaced by empty bobbins, and c, d; d, e; e, f; f, g; g, a, represent the movements of the empty bobbins. To lessen the extent to which the guide 10 of the carriage projects to the rear of the machine, the carriage 1 is made of width to accommodate one rail only, and is mounted on an intermediate carriage and adapted to slide thereon with lost motion, the other rail being carried between the ridge 6<c> and a ridge on the intermediate carriage. The projection of the guide 10 to the rear of the machine is avoided by mounting the lever arm 11<a>, 11<b> immediately below the flyers and mounting the carriage which is constructed as in the arrangement shown in Fig. 1, on a framework provided with bearing rollers for the carriage, this arrangement involving generally the same sequence of operations shown in Fig. 5 excepting that the lift d, e; e, f takes place at the vertical limb of the T. The lifter mechanism may be connected by lost motion gear with the mecbanism that traverses the carriage 1 so that the whole mechanism is operated by a single handle.