and provided with surfaces imposing additional retarding forces on material

Full Title

Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators > by devices acting on running material and not associated with supply or take-up devices (by controlling speed of driving mechanism of material-forwarding devices B65H59/38) > Stationary elements arranged to deflect material from straight path > and provided with surfaces imposing additional retarding forces on material