Patent GB-513513-A (GB)
Title: Improvements in and relating to spinning frames for flax, hemp, jute and the like
IPC: D01H5/28
Filed: 1938-01-08
Abstract: 513,513. Rove stop mechanism for spinning &c. machines. MACKIE & SONS, Ltd., J., and MACKIE, J. P. Jan. 8, 1938, Nos. 30642/37 and 28238/38. [Class 120 (ii)] In a spinning-frame for flax, hemp, jute and the like having stop motions which stop the feed without removing the material from between the retaining rollers and cause the material to be held against the pull of the drawing rollers by means of a part which clamps it and which can be readily released and ensures that an end will be formed above the nip of the drawing rollers, means are provided for ensuring or assisting in the feeding of the end to the nip of the drawing rollers when the feed is restarted by counteracting the tendency which the end has, owing to the presence of a part or parts between the retaining rollers and the drawing rollers, to follow a path which will not lead it to the nip of the drawing rollers; the means thus ensure that the end will be gripped by the drawing rollers without being handled by the operator. As shown in Fig. 1 a fibre controlling or slip draft device 19 having a roughly helical groove 20 in which the material is kept by the pull of the drawing rollers 2, is arranged between the drawing rollers and the retaining rollers 1 and a finger 21 is pivoted at the end of a weighted lever 22 which is pivoted on a bracket 24 carrying the detector 8 of the stop motion described in Specification 425,612. When the stop motion comes into action the finger 21 is released by a cam 25 on a link 9 and engages the material in the lower part of the groove 20 so that it cannot fall out of the groove and the end remains near the nip of the drawing rollers; when the stop motion is reset the finger 21 slides downwards in the groove 20 and carries the material with it so as to ensure that it will be gripped by the drawing rollers. In another form the material is kept in the groove of the member 19 by the flexible blades or vanes of a wheel which yieldingly press the material in the lower part of the groove and in another form the device 19 is pivoted and swung, when the stop motion comes into action, to bring its lower end against the vanes of a wheel or against a fixed stop so that the material is clamped near the lower end of the device or the vaned wheel may be moved towards the device 19 to clamp the material when the stop motion comes into action. In the arrangement shown in Fig. 5 the material passes through a false twist tube 40 between the retaining and drawing rollers and when the stop motion is brought into operation, the clutch 43, 45, through which the device 40 is driven from a pulley 42, is opened by a pin 46 on the link 9 engaging an arm 47 connected to the pulley 43 and the rotation of the twist tube is stopped to overcome the tendency for the material to rise up the tube when the lower end is hanging from it and to ensure the end remains near the nip of the drawing rollers; the drive of the twist tube may be stopped by loosening the belt drive or the tube may be allowed to rotate and the material clamped near the nip of the drawing rollers and a vaned wheel 30 may be provided to assist in maintaining the end near the nip of the drawing rollers and in feeding it forward when the stop motion is reset. If the twist tube is of considerable length, it may be mounted in trunnions in an arm so that when the stop motion is brought into operation, a cam on the link 9 of the stop motion strikes a projection on the bearing of the tube and swings it against a stop so that the path of the material is nearer the straight line between the retaining and drawing rollers than the path it has during the normal working of the frame; the maintenance of the material in the desired position near the nip of the drawing rollers or the return of the material to that position may be effected or assisted by jets of compressed air. In another arrangement, Fig. 7, a lever 62 is pivoted on a bracket 61 which is pivoted on the bracket 60 carrying the pivoted feeler 8, the pivots 63, 64 of the lever and bracket 61 being at right angles to one another. When the stop motion operates the linkbears against the lever 62 and turns it and the bracket 61 about the pivot 64 so that the lower end of the lever 62 clamps the material against a fixed surface 66, the material being deflected sideways and brought out of the nip of the drawing rollers; the surface 66 limits the movement of the lever 62 about the pivot 64 and continued upward movement of the link 9 causes the lever to turn about the pivot 63 and the lower end of the lever to move over the surface 66 and draw down and tension the material. When the stop motion is reset, the lever 62 moves to release the material which falls into the nip of the drawing rollers; the maintenance of the material near the nip of the drawing rollers or the return of the material to that position may be effected or assisted by jets of compressed air. Specification 513,513 also is referred to.