Patent GB-741327-A (GB)
Title: Improvements in method of and apparatus for forming precision wound yarn packages
IPC: B65H54/02
Filed: 1953-04-24
Abstract: 741,327. Winding yarn. UNITED STATES RUBBER CO. April 24, 1953 [June 20, 1952], No. 11313/53. Class 120 (2). A method of winding a precision yarn package (or a number thereof simultaneously) comprises supporting and rotating a core to wind yarn thereon, operating a yarn traverse at a constant ratio to the core speed to lay yarn on to the core, controlling the winding speed of the package by maintaining a speed governing arm in contact with the surface of the package, and rotating this drum at a speed which will cause it to hold back the package winding speed to that of the drum. First form of invention. -In each of the winding units yarn b from a package B is ballooned about a package A and the yarn a therefrom is plied with the yarn b to form a yarn c which is wound into a precision package P, the core of one package being driven from another. Yarn a of low or zero twist is drawn from a rotatable package A carried by a member 19 rotatably mounted on a spindle 20 secured to a bracket 21. The package-supporting disc 23, furnished with cushioning material 24, is attached to a brake ring 26 against which is pressed by springs 27 a non-rotatable brake ring 25. This pressure may be varied by a plunger 28, spring-urged at 39 and contacting a pivoted lever 36 carrying a pulley 35 about which the yarn a passes on its way to the centre of a driven hollow spindle 52, the spindle 52 being driven from a motor 16 through pulleys 54, 114 and belt 55, the belt being tightened by a spring-urged wedge pressing on a bell crank carrying a jockey pulley. The yarn a during unwinding from the package A is kept clear thereof by posts 29 about which it is led. After leaving a guide pulley 38, the yarn a passes to positive feed means comprising rollers 40, 41 rotating about spaced and inclined axes, the roller 40 being driven by a gear 43, lubricated by a gear 57, dipping into an oil bath, the gear 43 being driven by a worm 56 carried by the driven spindle 52. A spring-pressed idler roll 44, bearing against the yarn a on roller 40, counteracts slip of the yarn, which is then led through an aperture 47 in the stationary casing 31, over a grooved roll 48 and then down to the die 58 where it is plied with the yarn b. This yarn is positively drawn from a rotatable package B, by rolls 69, 70 about which it passes in spaced runs, a spring-pressed idler roll 71 counteracting slip. The yarn b is kept clear of the package B by being led about spaced bars 63 and about pulleys 65, 68, a pivoted lever 66 being positioned therebetween and furnished with a brake device so that if the yarn b increases in tension, the braking of the package B will be reduced and vice versa. The rolls 69, 70 are positively driven by a sprocket chain 77, Fig. 10. From the rolls 69, 70 the yarn b passes about pulleys 79, 80, 82, then through a ballooning control device 219 to a non-metallic flyer 84 and then to the plying die 58. The ballooncontrol device 219 is spring-urged and supported by a screw-threaded shaft and operates to adjust itself vertically by the friction of the yarn b upon the mouth portion of the device effecting the traversing of the same. The casing 31 is prevented from turning with the flyer 84 and spindle 52 by magnets 88, 89. If the casing 31 accidentally turns, one of the lower magnets 89 will drop to make a switch 90 and stop the motors 16, 17 which operate the machine. The yarns a, b are plied to form the yarn c in the die 58, the yarn c then passing from a fixed pulley 91 to a pulley 93 mounted on a spring-urged rocking lever 94, 96, the arm 96 governing, according to the yarn tension, the part of the tapered pulleys 99, 100 which will forward the yarn. The rolls 99, 100 are also driven by the chain 77, through sprockets, the chain 77 deriving its motion from the driven spindle 52. A free-running roll 110 contacts the yarn on the roll 99 to prevent yarn slippage. A main switch 113 is fitted with two operating projections so that if the lever 96 moves abnormally in either direction, the machine will be stopped. The yarn c now passes over a guide pulley 13<SP>1</SP> to the traverse mechanism comprising a cam 156, which through links 159, 160 (not shown) and lever 163 reciprocates sleeves 171 on rods 14 to traverse a number of threadguiding means 182 over a plurality of packages. The yarn c is guided from the pulley 13<SP>1</SP> to the bullet-shaped guide 182 over a roller 183 carried by a spring-urged lever 184 pivotally attached to the arm 173, so that as the package P grows, the moving arm 180 will bring the yarn c to the dot-dash position (Fig. 10). The packages P are wound upon cores 115 driven by chains and sprockets 148, 120, 124, 125 from the motor 17, the cores driving each other and being gripped between telescopic sleeves 131 and squared buttresses 136 (Fig. 4), the sleeves 131 being retractable to fit the cores by levers 130 moving in curved slots 130<SP>1</SP> in brackets 117. Slidable within the sleeves 131 are square shafts 134. The growing packages P, pivotally supported by arms 118 about a shaft 119, move away from speed-controlling rollers 187, 1871. In order that the speed of the package driving shafts 116, 116<SP>1</SP> may decrease as the packages grow, an adjustable slipping drive is provided at 139 in the drive to the chains 148, 149, the latter driving a manually-controlled changespeed drive to the traverse cam 156, whereby a number of short-traverse winds may be put in the tubes 115 at the beginning of a wind. The package-driving shafts 116, 1161 are slightly over-driven and the packages are braked by the frictional resistance of the drums 187, 187<SP>1</SP> upon which they rest, the drums being driven from the motor 17 through a variable-speed gear 188, the output side of which drives a chain 192 which drives the drums 187, 187<SP>1</SP>. The chain 192 also drives eccentrics which operate pawls 200 to advance a ratchet wheel 199 to change the speed gear 188 whereby the drums 187, 1871 are driven at an increasing speed, the pawls 200 being under the control of a rod 202 influenced by the tension in the yarn c. If the tension in the yarn c is high, the pawls 200 are held in the inactive position, and vice versa. In order to keep the pressure between the packages P and the drums 187, 187<SP>1</SP> substantially uniform, the arms 118 are influenced by springs 207 which press upon arms 210 and are arranged with a " dead-centre position," such that when the packages are small, the springs 207 increase their pressure on the supporting drums, and vice versa. The winding units motor 17 may be governed by a switch 225 controlled by the rod 202 as follows. The spring-pressed switch button 226 is arranged to start the motor upon its release. When the tension in yarn c is sufficiently high to pull the rod 202 beyond the fullline position (Fig. 1), the button is pressed and the motor stopped. Modified form of invention (Fig. 25).-Yarn s from packages 231 are rewound on packages 242, the packages 231 being braked at 236 under the control of spring-urged levers 240. The yarn s is then led, in each case, through a guide eye 264 held by a spring 265 to the traverse guide 263 carried by a pivoted spring urged arm 262 reciprocated by a rod 256 moved by a traverse cam 255 (not shown) on the shaft 254. The packages 242 which rest on speed-governing drums 243, are driven by shafts 244 mounted pivotally about a shaft 247 on arms 246, the package tubes driving each other as in the first modification. The main motor 283 drives the drums 243 through belts 288, 269 and chain 267 ; and the spindle shafts 244 through the above and chain 273, gears 253, 252 and chain 281. The shaft 254 is driven through an adjustable slipping clutch to allow the shafts 244 to adjust their speeds under the control of the package speed-governing drums 243. In order that the speed of drive of the belt 269 may be increased during winding, a link 284 attached to a packagesupporting arm 246 turns a bell-crank 285 to press a roller 287 under the belt 288 to vary the effective driving diameter of the adjustable pulley 289.