| 主权项 |
1. A system for fastening a rivet in a work piece with a rivet driver, the workpiece having a work surface, said rivet having a manufactured head, a shank, and a shank end, the shank and shank end nominally projecting from said work surface, said system comprising:
an anvil having an anvil face; a plunger slidably engaged with said anvil, said plunger having a distal end, said distal end nominally extending beyond said anvil face; a load source that is operative to nominally urge said plunger distal end forward relative to said anvil face while said distal end maintains in contact with a work surface; a sensor subsystem that is operative to sense the distance between said distal end and said anvil face and produce a first input signal related to said distance; and a control subsystem comprising a controller; said controller subsystem operative to:
enable and disable the rivet driver;receive said first input signal from said sensor subsystem;measure a protruding rivet shank length;determine a desired rivet head height;monitor subsequently produced first input signals;determine when one of said subsequently produced first input signals is substantially equal to said desired rivet head height;send an output signal to the controller; anddisable the rivet driver when said distance is substantially equal to said desired rivet head height; wherein said distal end is nominally in contact with said work surface when driving a rivet and said sensed distance is nominally a height of the rivet shank or of a deforming shop-head button projecting from said work surface. |
