Importance

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Abstract

A hemming machine of the type having a base, a nest for supporting a sheet metal part to be hemmed, and at least one die is disclosed in which the nest supporting the part to be hemmed is vertically displaced against the dies in order to form the hem. The improvement includes at least three elongated and external shafts wherein each shaft has one end rotatably mounted to the base so that the shafts are spaced apart and parallel with each other. A nut threadably engages each shaft, and these nuts are swivelly secured to the nest which permits a small amount of angular and radial deflection of the nut and shafts during movement of the nest from its lower to its upper position. An electric servo-motor is associated with each threaded shaft to rotatably drive the shafts substantially in unison with each other during the travel approach phase, and then allows in final a slight disynchronization of them, to insure an equalization of the hemming effort applied on each edge of the part, in both pre-hemming and hemming operations.

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First Claim