The positive linkage among chain and gear wheel allows for constant speeds even with torque fluctuations and very good reproducibility of speeds. Standard variable gear devices force the transmission element by applying excessive force – this is unnecessary and decreases the degree of efficiency.
Variable chain drives apply a lever mechanism, which applies just as 
much pressure on the slat chain as required. This results in low operating temperatures, extended life, high power PIV CHAIN CONVERTORS Variable Chain Drives density and an excellent efficiency – also in the partial load range.