Method of detecting long and short rivets

Details Method of detecting long and short rivets Method of detecting long and short rivets

1992-01-10

1993-06-08

Cuchlinski, Jr., William A.

Geometrical instruments

Distance measuring

Single contact with a work engaging support

33555, 33710, 295252, 2924353, G01B 502, B21J 1502, B21J 1512

Patent

active

052168190

ABSTRACT:
A method of detecting rivets which are outside of a predetermined length tolerance includes holding a rivet in a first reference position with its head in a rivet hole countersink, and moving a probe, in the form of a rivet tail die, into contact with the rivet tail. The position of the probe when it contacts the rivet tail is detected and compared with the predetermined position tolerences corresponding to the rivet length tolerences. The rivet is held in the first reference position by a rivet head die with a force greater than the force exerted by the probe when contacting the rivet tail to ensure that the rivet stays in the reference position during the measuring step. If the rivet is too long or too short, a rivet recovery sequence is executed to remove the out-sized rivet and a new rivet is inserted and measured. When the rivet is confirmed to be within the length tolerance, the rivet dies are driven inward toward each other to upset the rivet.

REFERENCES:
patent: 2367797 (1945-01-01), Rappl
patent: 3298605 (1967-01-01), Bucke et al.
patent: 4160326 (1979-07-01), Griesbach
patent: 4662556 (1987-05-01), Giolund
patent: 4885836 (1989-12-01), Bonomi et al.
patent: 4941269 (1990-07-01), Mori et al.
patent: 5040309 (1991-08-01), Hayden et al.
patent: 5060362 (1991-10-01), Birke et al.

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