Arrangement and the stepwise advance of band material with two oppositely driven feed rollers

An arrangement for the stepwise feeding of band material, comprising two oppositely driven feed roller means, a first one of said feedroller means being locally fixedly supported and a second feed roller means being alternately movable by a lifting means toward the first feed roller means or away from the latter into a return position at the point in time of reversal of the direction of rotation of at least one of the feed roller means, the second feed roller means being rotatably supported in a rocket means, said lifting means including a guide element engaging at one end of the rocker means and a spring force storage means engaging at the other end of the rocker means disposed opposite with respect to the axis of the second feed roller means, the direction of action of the spring force storage means being in the direction of the abutment of the second feed roller means at the first feed roller means, guide means engaging at the rocker means between the second feed roller means and the point of engagement of the guide element at the rocker means near one end of the guide means, said guide means being locally fixedly and rotatably supported with its other end approximately at the height of the center of the second feed roller means, a pressure device operatively connected with the guide means which in the return position of the second feed roller means is operable to be pressed against a locally fixed counter member under interposition of the band material for purposes of holding the band material during the return movement of the first feed roller means, a connecting rod engaging at the guide element at a point spaced with respect to the point of engagement thereof at the rocker means, the connecting rod being operable to be driven by way of an eccentric means in a locally fixed bearing support substantially parallelly to the rocker means and extending in the direction thereof.