The cages contai n the necessary number of cradles arranged in ranks of six. Each rank is contained between a couple of disks directly supported by a tough centrai shaft, carried by two supports through two overdimensioned taper roller bearings. A wearless rotation is so obtained, thus avoiding any necessities of external supports like gesadur rolls. Ali the cynematic relations (the horyzontal, and fixed in respect of ground, orientation of the first rank cradles; and the transmission of the same motion to the other ranks) andthe generai drive of the machine are obtained by means of toothed belts, so obtaining a very silent, effective and troublefree operation. The rotation power is supplied by an AC electrical motor with inverter, so avoiding the customary maintenance and substitution problem on rotatory commutators and brushes, usual on traditional rotating machines. A compact and reliable machine, of rational design and
sturdy construction, draft for years of troublefree operation: an effective workhorse.

The version of the machine illustrated in the pictures has two independent cages, the first carrying six bobbins arranged in a sole rank, the second carrying twelve bobbins in two ranges. It's used to strand bare copper conductors (strands of 16 mm2 cross section) to produce paper insulated power cables for transformers (of 600 mm2 cross section). In a first run, with cages rotating independently and in opposite sense, a 1 + 6 + 12 section is obtained, as opposed layers of 6 and 12 are added to the centrai core; in a second run, with the two cages operating in tandem and rotating in the same sense, the third layer of 18 is added.The so obtained 1 + 6 + 12 + 18 cable is shaped in the desired section, circular (by a compacting die) or squared (by couples of compacting rolls) and then covered (by three taping heads operating in series), with several layers of paper/polyester cellophane/ copper/aluminum tapes.

Diagram of  Planetary Strander for  400 / 500 / 600 / 630 / 800 mm bobbin diameter