초록 ▼

Two riveting-set assemblies (14) are each mounted on a carrier device (4, 5) which may be an effector mounted on a robot arm (A, B), on each side of the workpieces (2, 3) to be joined by riveting. Each carrier device is provided with driving means which comprise an electric motor (21), preferably a

Two riveting-set assemblies (14) are each mounted on a carrier device (4, 5) which may be an effector mounted on a robot arm (A, B), on each side of the workpieces (2, 3) to be joined by riveting. Each carrier device is provided with driving means which comprise an electric motor (21), preferably a brushless motor, which drives the riveting-set assembly translationally, for example via ball screws (18, 19). Control means (25) are designed to actuate the two motors (21) in such a manner that the riveting sets (14) encounter the rivet (1) with a time delay and/or a kinetic energy difference which are chosen in order to form the rivet in the desired manner, avoiding, at the workpieces to be joined, undesirable movements or stresses.

대표청구항 ▼

[ I claim:] [1.] An apparatus for joining workpieces by riveting, said apparatus comprising a first tool and a second tool for acting in a substantially synchronous manner on opposite ends of a rivet, said first and second tools respectively comprising:first and second carrier devices;a first riveti

[ I claim:] [1.] An apparatus for joining workpieces by riveting, said apparatus comprising a first tool and a second tool for acting in a substantially synchronous manner on opposite ends of a rivet, said first and second tools respectively comprising:first and second carrier devices;a first riveting-set assembly including a first riveting set and a second riveting-set assembly including a second riveting set, said first and second riveting-set assemblies being respectively mounted on said first and second carrier devices;first and second guiding means for respectively moving each of said first and second riveting-set assemblies along a defined path;means for keeping each of said first and second carrier devices in a position respectively to move an active face of one of said first and second riveting sets substantially along a path parallel to an axis of said rivet, when said active face comes into contact with a corresponding end of the rivet;driving means for driving each of said first and second carrier devices, said driving means comprising first and second electric motors for respectively imparting a velocity to a corresponding one of said first and second riveting sets moving along its said path toward the other one of said first and second riveting sets, said velocity being sufficient to provide the riveting set with sufficient kinetic energy to form the rivet; andcontrol means for actuating said driving means to drive said first and second carrier devices approximately simultaneously.