1. A barb wire machine for the manufacture of single strand barbed wire having a main strand and barbs wound at intervals thereon comprising, in combination, a pair of wire forming rollers containing co-acting circumferential grooves through which said rollers pass said main strand deforming said main strand at least in specific places where barbs are to be wound thereon, a box-like frame of said machine, a central main shaft journalled in said frame, a motor having first transmission means driving said main central shaft, a cam mounted on said main central shaft, a cam driven arm pivotally mounted at its center in said frame and having a follower to ride on said cam and having a vertical upstanding portion, two upstanding arms within said frame at opposite ends of said frame, a horizontal bar connected to the tops of said upstanding arms and said upstanding portion of said cam driven arm, spring means urging one of said upstanding arms toward an end of said frame to hold said follower against said cam, exterior upstanding arms on common shafts with said upstanding arms within said frame, said exterior arms having first and second pulleys mounted thereon, a barb winding head assembly on said frame disposed between said first and second pulleys of said exterior upstanding arms, second transmission means connecting said main central shaft to said winding head assembly to drive said winding head assembly, two pairs of barb wire feed rollers on said winding head assembly, third transmission means connected between one of said upstanding arms and each pair of said barb wire feed rollers intermittently driving said pairs of barb wire feed rollers, a third idler pulley disposed above said wire forming rollers and between said exterior upstanding arms, a wire guide pulley disposed between said exterior upstanding arms, fourth transmission means between said central shaft and said wire guide pulley driving said wire guide pulley, said main strand passing from said wire forming rollers about said third idler pulley, passing outward about said first idler pulley to extend through said winding head assEmbly and then about said second idler pulley, and passing inward about said wire guide pulley, a wire reel, slip clutch means, and a fifth transmission means between said central shaft and said wire reel driving said wire reel through said slip clutch means to wind barbed wire on said wire reel, said main strand being intermittently advanced through said winding head assembly between periods of rest during which barbs are wound on said main strand by said winding head assembly.