Patent ID: 6474125
Filing Date: 2002-11-05
Classification: B21D,Y10T

Abstract:
A hemming machine comprising:a base adapted to be supported on a ground support surface, hemming tooling mounted to said base, a cradle vertically slidably mounted to said base, a nest mounted to said cradle, said nest adapted to support a part to be hemmed, a first and second ball screw rotatably mounted to said base, said ball screws being threadably connected to said cradle on opposite sides of said nest so that rotation of said ball screws vertically displaces said cradle relative to said base, a single drive motor drivingly connected to both said first and second ball screws which rotatably drives said shafts in synchronism with each other, a control system which controls the activation of said motor, a first position transducer operatively coupled to said first bull screw, said first position transducer providing an output signal indicative of the rotational position of said first ball screw, and a second position transducer operatively coupled to said second ball screw, said second position transducer providing an output signal indicative of the rotational position of said second ball screw, said output signals from said transducers being connected as input signals to said control system.