Patent ID: 6869002

Claim:
An apparatus for an intermittent feeding of a strip shaped blank to a punch press which is equipped with tools adapted for intermittent working of the strip shaped blank, which feeding apparatus includes a housing and a threaded spindle housing arranged on said housing, an upper shaft assembly and an upper feeding roller mounted on said upper shaft assembly, a lower shaft assembly and a lower feeding roller mounted on said lower shaft assembly, which feeding rollers are adapted to grip said blank to be fed by clamping said blank at both its sides and to feed said blank intermittently by an intermittent rotational movement, of which shaft assemblies at least one is drivingly connected to an intermittently operating electric servomotor and the upper shaft assembly is supported in a rocker which is pivotally mounted at said housing through a rocker shaft, by means of which rocker said upper shaft assembly is movable towards and away from said lower shaft assembly; comprising an adjusting motor with a threaded spindle and a control apparatus, an adjusting nut arranged on said threaded spindle and adapted to be moved along said spindle by a rotational movement of said spindle; a drive motor and an eccentric disc drivingly coupled to said drive motor, a rod supported on said eccentric disc, which rod has at an end remote from said eccentric disc an elongate hole extending at least approximately parallel to said threaded spindle; a first double arm lever unit supported on said adjusting nut and a second double arm lever unit supported on a shaft which in turn is supported in said threaded spindle housing; which first double arm lever unit includes a first arm which engages said rod and includes a second arm which is pivotally mounted to a connecting strip which in turn is pivotally mounted to a first arm of said second double arm lever unit which has a second arm which is pivotally mounted to a control rod unit which in turn is pivotally mounted to said rocker; and comprising a pressure spring assembly arranged between said rocker and said threaded spindle housing, which pressure spring assembly is adapted to press said rocker with said upper shaft assembly and with the upper feeding roller supported therein onto the lower shaft assembly with said lower feeding roller.