Device for SZ twisting of twist elements of electric cables and wires

Claim 1

In an apparatus for the SZ-twisting of twist elements of electric cables and wires to form an SZ-twisted unit, including a first twisting device comprising one or more twisting means which are arranged between a first and a last twisting point and revolve in a stepwise alternating manner, and a storage device for the twist elements twisted at least one first time, the storage device having a very large storage capacity, the improvement comprising: a second twisting device in series with the first twisting device and including, a retwisting disc, adapted to be driven with alternating direction of rotation, through which the SZ-twisted twist elements twisted in the first twisting device pass, and at least one twisting closer point associated with said retwisting disc; the free distance of said retwisting disc from the last point of contact with the SZ-twisted elements in the first twisting device being at least five times the resulting SZ length of lay, the speed of rotation of said retwisting disc being equal to the difference in speed between two successive steps of said first twisting device; and the direction of rotation of said retwisting disc adapted to be changed in the same rhythm as the change from a speed reduction to a speed increase of the first twisting device or vice versa.