A adjusting nut is arranged on a threaded spindle. The adjusting nut
supports a first double arm lever unit with a first and a second arm. A
second double arm lever unit is pivotally mounted at its first arm
through a connecting strip to the second arm of the first double arm
unit. The second arm of the second double arm unit is pivotally mounted
through a control rod unit to a rocker. This rocker supports a upper
feeding roller which co-operates with a lower feeding roller for a
feeding of a strip shaped blank. The first arm of the first double arm
unit supports a bolt which projects into a elongate hole of a
eccentrically supported rod.