Tensioning and conveying assembly for leather pattern forming machine

The invention discloses a tensioning and conveying assembly for a leather pattern forming machine. The tensioning and conveying assembly comprises two symmetrically arranged chain wheel conveying assemblies and two symmetrically arranged tensioning assemblies, wherein each chain wheel conveying assembly is provided with a first chain wheel, a second chain wheel and a chain, chain wheel shafts areof the first chain wheel and the second chain wheel are fixed to a rack through bearings; the chains wind around the first chain wheels and the second chain wheels; the first chain wheels or the second chain wheels in the two chain wheel conveying assemblies are driven by the same chain wheel motor and rotate oppositely; and each tensioning assembly is provided with a tensioning frame, a pressurizing support, a pressurizing cylinder, pressurizing slide rails, a pressurizing slider, a press shaft and a press wheel, a piercing plate is fixed to the tensioning frame, multiple needle bars are fixed to the piercing plate,