Patent GB-357235-A (GB)
Title: Improvements in or relating to the manufacture of multi-conductor electric cables
IPC: H01B13/02
Filed: 1930-06-19
Abstract: 357,235. Cables. STANDARD TELEPHONES & CABLES, Ltd., Columbia House, Aldwych, London. -(Assignees of Reichelt, L. O.; 327, Manor Avenue, Cranford, New Jersey, U.S.A.) June 19, 1930, No. 18708. Convention date, Sept. 11, 1929. [Class 36.] In the manufacture of a multi-conductor telephone cable, twisted pairs of individually insulated conductors are twisted together to form a unit by imparting to the pairs two separate twists in the same direction, a binder being applied to the conductors between the twists so that the second twist introduces surplus conductor lengths in the inner layers of the unit. The units thus formed are then twisted together in the opposite direction with such lay as to form a cable in which the surplus lengths have been sheathed. In the machine shown in Fig. 1 for forming the units which are to be twisted into the finished cable in the machine of Fig 2., spools 11, on a normally stationary carrier 10, are each wound with a twisted pair of individually insulated conductors 12 which are fed over pulleys on tension controlling arms 14 to a stationary distributer plate 15 mounted in a heel 16 of the carrier 10. A flier 18, comprising spaced interconnected annular discs 19, 20 and reduced tubular ends 22, 23, is mounted to rotate on standards 24. A sizing die 26 in the flier end 22 assembles the conductors 12 into a group 27 of circular cross section to pass through a sleeve 28. A cop 30 on the sleeve 28 feeds cotton binding which is spirally wrapped on the group 27 as it emerges from the sleeve 28. The bound group 27 of conductors is then drawn over a guide sheave 31 rotatably mounted on the flier end 23, and the group 27 passes, by the action of a capstan 37; through guides 32 in the discs 19, 20 and round sheaves 33, 34 rotatably carried on the flier end 23. The capstan 37 comprises endless chains 39 which travel round sprockets 41, 42, the sprockets 42 being driven through gearing from the main drive. A take-up reel 38 is driven through gearing from the main drive. Gear teeth 50 on the peripheries of the discs 19, 20 mesh with pinions 51 on the main shaft 46 so that the flier is driven at the proper relative speed with respect to the capstan 37 and reel 38. The carrier 10 is suspended in a stationary position between the discs 19, 20 by planetary gearing 52, 53. The group 27 is carried, by the rotation of the flier 18, bodily round the conductor supplies to twist the individual conductors together to form a cable unit 54. The cable assembling machine shown in Fig. 2 comprises stationary distributer plate 55 through which the units 54 are drawn from supply reels 38 by a capstan 56 which is mounted on a rotatable annular plate 58. The units 54 then pass through a sizing die 60 to form a compact bundle 61 which passes through a guide sleeve 62. A serving head 64 with a rotatable supply reel 65 of paper ribbon 66 is mounted on the sleeve 62 and is driven by belts and pulleys from the main drive, the ribbon 66 being spirally wrapped round the bundle of cable units as it emerges from the sleeve 62. The bound bundle 61 then passes through a central aperture 75 in the plate 58 which is rotatably journalled in a bearing 76 and is driven by gearing from the main drive. The capstan 56 is driven, through gearing, by the plate 58, the cable units 54 being twisted into a cable of lay depending on the relative speeds of the capstan 56 and plate 58. The cable 88 thus formed is delivered to a take-up reel 90 which is removably mounted in a rotatable cradle 91. The cradle 91 comprises spaced rings 92 carried on rollers 93 and rigidly interconnected. The rings 92 are driven by gearing from the main shaft at the same speed as the plate 58, the reel 90 revolving at the same speed as the capstan 56 so that there is no additional twist between the capstan 56 and reel 90.