Wenderoth, Lind & Ponack
Material tensioning method and apparatus
 For use in drawing, straightening or stretching a strip of metallic material such as bars, wire, and coils, an apparatus having a pair of elastic ring-equipped roll assemblies which provide a high tensioning force for the strip material held therebetween. As the tensioning force increases, the elastic ring in each of the roll assemblies tends to deform elastically along the circumferential direction of the area which contacts the material, thus increasing the contact area over which the applied force is evenly distributed. By this means the force per unit area can be reduced. The elastic ring is mounted on a control driving shaft by at least three axially rotatable rollers, two of which are arranged to bridge the area of the material contacted by the ring. 
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Keiichiro
Yoshida