An apparatus for stepwise feeding strip-shaped material, comprising a frame;
- and
- an arrangement for stepwise feeding of a strip-shaped article comprising:
- first and second feeding rollers adapted to receive between them a strip-shaped article to be fed;
- means for driving said first and second feeding rollers to oscillate in contrarotating direction;
- a rocker having first and second opposite ends;
- said first feeding roller being supported for rotation in said frame in a Non displaceable state, said second feeding roller being supported for rotation in said rocker;
- means for moving said rocker and said second feeding roller therewith towards said first feeding roller in a feeding position and away from said first feeding roller in a return position;
- said means for moving said rocker including a control means which communicates with said means for driving said feeding rollers and includes a translatory moveable rod member guided for an upwards and downwards movement, said rod member being mounted to said first end of said rocker and adapted to move said rocker together with said second feeding roller supported therein, at a point in time of a reversal of a first direction of rotation of the oscillating feeding rollers, to said feeding position, and at a point of time of a reversal of a second direction of rotation of the feeding rollers to said return position;
- said second feeding roller having an axis;
- a first pressure spring having a first end resting on said rocker at a point between said axis of said second feeding roller and said second end of said rocker, said first pressure spring having a second end opposite said first end resting on said frame, said first pressure spring acting on said rocker from the same side as said rod member and in a direction substantially parallel to a direction of movement of said rod member;
- a clamping bar mounted to said rocker and a stationary clamping bar counter member arranged at said frame, said clamping bar being biased by said first pressure spring against said stationary counter member in order to arrest a respective strip-shaped article when said second feeding roller is in its return movement position, and is lifted off said stationary counter member when said second feeding roller is in its feeding movement position;
- said rocker being supported at one side thereat for rotation on a cantilever structure which in turn is supported in said frame for rotation in a non displaceable state, said cantilever structure comprising a sleeve supported for free rotation in said frame, said sleeve having a laterally projecting arm supporting a shaft which extends parallel to said sleeve and is held in said arm in a releasably clamped state, and wherein said rocker is supported for rotation on said shaft, said shaft being held in a slotted end portion of said arm, and wherein threaded bolts extend through said slotted end portion to hold said shaft in the clamped state in said arm.