Patent GB-818000-A (GB)
Title: Method of and apparatus for crimping wholly or partially synthetic threads and thread strands
IPC: D02G1/02
Filed: 1956-05-22
Abstract: 818,000. Crimping yarns and fibres; textile spinning &c. machines. PERLINGER, H., and RICHTER, H., [trading as PERLINGER & RICHTER PRIMATEX]. May 22, 1956 [Sept.19, 1955; Mareh 2, 1956], No. 15727/56. Classes 120(2) and 120(3) In a process for crimping wholly synthetic yarns or filaments or strands of filaments or yarn spun from synthetic staple fibre which may be mixed with natural fibres by subjecting the yarns &c. to successive treatments of twisting, fixing and untwisting, the twisting and untwisting are both performed in a two-forone or double twisting device i.e. each complete revolution of a rotating part of the device produces two complete twists in the yarn. The device shown in Fig. 1 comprises a bearing housing 1 (carried on the twister frame) rotatably supporting a hollow spindle 2 which carries a driving whorl 5 and a twisting member 6 and on which is freely mounted a rotatable platform 12 normally located by soft-iron segments 13, 14, coacting with stationary magnets 15, 16, and carrying a drum 19 which is freely rotatable within brackets 17, 18 and comprises internal electrical heating elements connected to a battery or to an external supply via slip rings 7, 8, and 25, conductors 23, 24 and 26, 27. Yarn fed from rolls 28, 29 passes through a guide 30, enters a bore 9 in the member 6, emerges within the spindle 2, passes one or more turns around the drum 19 (which sets the double twist in the yarn), thence through a guide 20, a bore 10 in the member 6 and the (doubly) untwisted yarn emerges from the spindle 2 to be withdrawn by rolls 31, 32: the tension of the yarn to be crimped may be brought to a predetermined value by means of a tapered or stepped cylinder or additional drafting of the yarn may be effected thereby. In the device of Fig. 2, a bearing housing supported by a twister frame 33 rotatably supports a hollow spindle 37 fixedly mounting a whorl 38, an electrical heating element (connected to an external supply through conductors 46, 47, and slip rings 40, 41, carbon brushes 42, 43 and terminals 44, 45) and a member 39 enclosing a housing 53 which is located by soft-iron segments 57, 58, coacting with stationary magnets 59, 60, and is freely mounted (together with a winding core 50) on the spindle 37. The core 50 supports a member 52 a tubular extension 61 of which rotatably mounts a head-piece 64 which supports from its guide collar 67 winding and unwinding pins 68 and 69. In operation, two or more supply threads pass through a guide 72 and are formed by the collar 67 into a balloon a which enters a bore 73 in the member 39 and remains therewithin over the section b, emerges through a bore 74 to form the section c, enters a bore 75, passes, at d through the bore of the spindle 37 and bores 51, 65 of the member 52; at e the emerging thread passes through a bore (not shown) in the collar 67 and a guide 70 (at f) to be wound on the core 50 (whereat the twist in the thread, is set), it is unwound by the pin 69 which it leaves via an eye 71, at g; it then passes through another bore in the collar 67 and, at h, through a bore 66, travels downwardly, at i, and passes through a bore 76, remains within the member 39, at k, emerges through a bore 77 to form a section l, passes through a bore 78 to the bore of the spindle 37 from which it is withdrawn, at m: the only parts which rotate are the member 39 and, at a lower speed, the headpiece 64 (caused by tension in the thread as it is pulled off the core 50 by the eye 71). In the modification shown in Fig. 3, a bearing housing 80 rotatably supports a hollow spindle 83 to which are secured a whorl 84, an electrical heating element 92 supplied through slip rings 86, 87, and a member 85 enclosing a housing 97 which, with a winding core 94, is rotatably mounted on the spindle 83 and located by soft-iron segments 101, 102, coacting with stationary magnets 103, 104. A member 96 on the core 94 carries a head-piece formed by a rod 105 having a tapered portion 106. In operation, one or more supply threads pass through a guide 109 and form a balloon, at a, passes through a bore 110 to continue as a section b within the member 85 from which thread emerges through a bore 111, the section e then enters a bore 112 to pass along the bore of the spindle 83 and form a section d which passes through a bore 95 in the member 96 into the head-piece whence thread passes outwardly through a radial bore 107 and is wrapped, at c, around the rod 105, then passes through a bore 108 and is led (as a balloon i) through a bore 113 into the member 85, at k, and emerges through a bore 114 as the section l which passes through a bore 115 into the bore of the shaft 83 through which it is withdrawn, at m. If another head-piece, Fig. 4 (not shown) is used, thread passes upwards through an axial bore in the rod 105, outwards through the bore 107, it is wrapped around the rod and then passes through a second transverse bore in the rod to return to the axial bore, emerging at the tip of the rod. Another modified head-piece 116, Fig. 5, comprises a bore 117 and a slot carrying a pulley 120 freely rotatable on an axle 119: thread emerging from the spindle 83 passes through the lower part of the bore 117, is wrapped around the pulley 120 and leaves the tip of the head-piece via the bore 117. As shown in Fig. 7, the base portion may comprise only a lower portion 85<SP>1</SP>, having bores 111, 112, 114, 115 provided by replaceable inserts, and a balloon guide ring 121 surrounding a housing 97<SP>1</SP> (carrying soft-iron segments 101<SP>1</SP>, 102<SP>1</SP>, cast therewithin) and secured to magnets 103, 104: threads are guided through the annular gap between the ring and the housing. The feed roller 122 may also apply liquid to the supply threads or the threads may be wetted before passing through the feed rollers, Figs. 8 and 9 (not shown).