Traction unit for a drawing machine

Traction unit for a drawing machine, the unit cooperating with a drawing die and comprising at least two drive chains with drawing links lying on the same plane, each of said at least two drive chains comprising a plurality of links having an opposed inner surface and outer drawing surface and opposed lateral outer sides, each of said at least two drive chains cooperating with load bearing rollers and with a rigid guide, the drawing action being obtained by the forward movement of the drive chains with drawing links and by the reciprocal contact taking place between the drawing chains with drawing links in their opposed drawing segment, the unit being characterized in that the load bearing rollers comprise a linked chain of idler rollers positioned in a ring, the linked chain of idler rollers being able to be moved by sliding and being placed between the inner surface of the links and the rigid guide, in which each link has at each of its two lateral outer sides a lateral drawing and, on the inner side of the lateral drawing links, lateral idler rollers link, said link further comprising a link body cooperating with a connecting and positioning pivot and being included in an intermediate position between the lateral drawing links, and further comprising lateral idler rollers, each of which is provided between said link body and each of said lateral drawing links.