Patent GB-823254-A (GB)
Title: Improvements in or relating to apparatus for the treatment of filamentary materials
IPC: D01H13/14
Filed: 1956-07-16
Abstract: 823,254. Making cables &c. CELANESE CORPORATION OF AMERICA. July 16, 1956 [July 14, 1955], No. 21899/56. Class 109 Apparatus for the treatment of filamentary materials comprises means for mounting a package of filamentary material for movement in a path, means for drawing material from the package during its movement in the path and control means for engaging the material close to the package, the control means being responsive to the movement of the package to permit the free drawing off of the material when the package is moving but protracting the drawing off when the package stops moving. As described, the invention is applied to a cable twisting machine which comprises a circular lay plate 12 having symmetrically spaced apertures through which strands of metal wire and of filling material (tow) are led to a stationary closing die 13. The lay plate 12, a shaft 16 and a wheel 17 are rotated together by means not shown. Reels of wire (not shown) are supported behind the wheel 17, one of the wires being designated as 33. The strands of filling material are supplied to the lay plate 12 from packages mounted on the wheel 17 in cylindrical housings 47, the packages being prevented from rotating about their own axes. The lids 48 of the housings 47 are each provided with a circular opening 58 for the passage of tow from the packages 41 to the lay plate 12. Each opening 58 is lined with a smooth hard-surfaced ring 59 and is offset from the axis of the corresponding container 47 in a direction toward the centre of the wheel 17. Each of the lids 48 is provided with means for engaging the tow and retarding its movement when the wheel 17 is at rest, while permitting free movement of the tow when the wheel is rotating. In one pre-. ferred form, Fig. 4, such means comprises ' a curved arm 64 pivoted at the side of the opening 58 and urged by a coil pivot spring to a position, shown in solid lines, where it engages the tow and presses it against the side of the ring 59. When the wheel 17 is rotating the resulting centrifugal force causes the arm 64 to swing against the action of the spring 66, Fig. 5 (not shown), to the position shown in dotted lines, thus clearing the opening 58 for free passage of tow. When the wheel 17 is stopped, the force of the spring 66 brings the arm 64 back to its tow-engaging position. Figs. 6, 7 and 8 show modified forms of the tow-engaging device. In Fig. 6 the arm 64 is replaced by a rod 78 attached to the lid 48 through a spring 79. The device of Fig. 7 comprises a closed loop of wire 84 normally of oval or circular shape and of such size to encircle the opening 58. One point of the wire is fixed to the lid 48 while a diametrically opposed point is fixed to one end of a bent arm 86 which is pivotally supported on the lid 48. When the wheel 17 stops a spring 88 acts to move the arm 86 to a position where the sides of the loops 84 are brought together to grip the tow (solid lines). The distribution of mass of the arm 86 is such that, when the wheel 17 is rotating, centrifugal force urges the arm 86 to the position shown in dotted lines. so clearing the opening 58. The device of Fig. 8 comprises a pair of pivoted arms 91 adapted to grip the tow between them when the wheel 17 is at rest. The arms 91 have weights 96 and, when the wheel 17 is rotating, the arms 91 move to the position shown in dotted lines.