Patent GB-190620943-A (GB)
Title: Improvements appertaining to Doffing Mechanism for Spinning, Twisting, Doubling and like Machines used in the Production of Yarns or Threads of Fibrous Substances.
Inventor: ARNOLD-FORSTER WILLIAM HOWARD
Filed: 1906-09-21
Granted: 1907-08-22
Abstract: 20,943. Forster, W. H. Arnold-, Stell, A., and Stell, J. Sept. 21. Doffing-arrangements; thread holding and severing arrangements.-In the class of mechanism described in Specifications No. 25,714, A.D. 1905, and No. 10,265, A.D. 1906, in which the doffing operations are effected without removing the flyers from their spindles, the usual bifurcated pieces a, Figs. 3 and 10, for retaining the drag washers in position during doffing are mounted with a small amount of rotary freedom on a rod b, so that when the rod is rotated to bring the pieces into action this freedom permits all the pieces to rest freely on the washers irrespective of small differences in their heights. The freedom is provided by mounting the pieces a loosely on the rod b, or by providing pins c on the rod to extend through slits c' in the pieces. The pieces may be formed with single projecting tongues to rest on the washers, in which case the rod b may be adjusted longitudinally to adjust the tongues for use with bobbins having flanges of different sizes. Preparatory to doffing, the pieces a are turned over to hold the washers, the spiked bars y moved to engage the full bobbins, and the spindle-steadying devices z turned over against the spindles. The lifting-rail is then lowered clear of the spindle g, and the spindle tilted into alinement with the pegs f<1> on to which the full bobbins fall by the withdrawal of the spiked bars y. A few coils of the yarn extending from the full bobbins to the flyer eyes are thus left on the spindles and are stripped therefrom by pairs of fingers h<2> on a bar h, which is raised by a rack m and pinion n to bring the fingers into position to lay hold of the yarn when the bar h is rotated. The spindles are next tilted into alinement with the pegs f carrying the empty bobbins, and the bar h is lowered and rotated to bring the fingers h<2> below these bobbins, so that on raising the bar again the bobbins are raised up on both spindles until the spiked bars y can be engaged below their flanges to support them while the bar h is lowered, the spindles returned to their vertical or operative position, and the lifter rail raised. The bars y and devices a, z are then moved clear, and the rod 3 is turned into position to hold the yarn across a cutting-device r, s, which, after the bobbins have been rotated to wind on a few coils, is operated to sever the yarns. The cutting- device consists of a pair of concentric tubes r, s, Fig. 6, provided with cutting-edges r<1>, s<1>, one of the tubes being moved longitudinally, by a lever t and rotated by a coarse-threaded part t<1> engaging a nut t<2> to effect the severance, but in some cases both tubes may be moved. The pegs f<1> for receiving the full bobbins may be mounted alternately with the pegs f carrying the empty bobbins on the same bar when the pitch of the spindles will permit, a cam being employed to move the bar longitudinally so as to bring one or other set of pegs into alinement with the tilted spindles.