Patent GB-850743-A (GB)
Title: Improvements in or relating to methods of manufacturing electric cables
Inventor: DEMMEL GEORG
IPC: D07B1/14
Filed: 1958-02-21
Abstract: 850,743. Stranding cores. SIEMENSSCHUCKERTWERKE A.G. Feb. 21, 1958, No. 5801/58. Class 109. Stranded elements are made from individual cores by pulling each core from a supply fixed in space over a take-off wheel to a device serving to balance the cores as regards length and tension and thence to twisting means. In a simple arrangement, Fig. 2, the cores are pulled by a drum 16 rotating in a twisting frame 17 from fixed reels 10, and pass over take-off rollers 18 and a balancing device comprising for each core a fixed roller 20 and one movable against a spring 21. The method may also be applied to producing star quads for cables in a vertical arrangement. The cores may be drawn off horizontal or vertically-arranged drums 10, Fig. 10, which may have caps and be rotated for the core to be drawn off over-end, off drums in rotating yokes 11, Fig. 6, or from looped or other coils in rotating open containers 105, Fig. 16. There may be a take-off wheel 18 for each core or one, 22 Fig. 6 common to all four, a balancing wheel 22A being provided: in such a case, the take-off wheel may be in a cage which rotates to strand and unstrand the cores at 24, 25. The quad may be finally twisted and collected in a rotating-frame 44, Fig. 6, or by a double-twisting tubular flyer 31, Fig. 10, rotating with a cage 36 which directs the quad to a drum 16 held stationary by gearing 37, 38. In Fig. 16, the rotating flyer leads the quad via guide wheels over a take-off wheel 119, over which the quad is constrained to travel helically, to a spiral guide-tube 120 which is rotated to deposit the quads in looped coils in a slowly-rotating container 121. The quad may pass to the wheel 119 through the mandrel 126. In another form, Fig. 18 (not shown), the quad is laid in coils in a stationary container, the flyer rotating around a yoke carrying the container and held stationary, and the guide-tube rotating centrally above the container. In a further form, Fig. 19, (not shown), where the quad is twisted once only, the flyer is dispensed with and the quad passes into a rotating twisting-cage carrying a take-off roller and a guide-tube driven by the passage of the quad over the take-off roller rotating above a relatively stationary container. To keep the movable roller 19 of the balancing- means as near a central position as possible, the position of the rollers may be made to control the speed of the take-up drum 16, of the take-off wheel 119, or of the take-off wheels 18. In Fig. 10, a fork or arm 84 influences the setting of a potentiometer 62 in circuit through brushes and slip rings 70, 68, 69 with a magnetic slip-clutch through which the drum is driven; also, an arm 93 towards the ends of its permitted travel closes contact pairs 91, 92 in circuit through a polechanger and a time-relay with a control motor 96, which through differential gearing 98, increases or reduces the speed at which the take-off wheel 18 is rotated. The take-off wheel may, also, be constituted as a conical roller on which the position of the core is varied by a fork influenced by the position of the roller 19, Fig. 8 (not shown).