Tool with breakage sensor and method

Cutting – With randomly actuated stopping means – Responsive to tool detector or work-feed-means detector

Patent

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Details

83686, B26F 114, B26D 500

Patent

active

055842160

ABSTRACT:
A die punch includes a shank configured to operably engage a tool holder on a die, and a tip extending from the shank, the tip being configured to punch a hole in sheet material. A conductor extends from the shank to the tip along a longitudinally extending passageway in the punch. The conductor is insulated from the shank but electrically connected to said tip at one end by a bridge so that an electrical circuit is defined from the conductor through the bridge and tip to the shank. A first electrical contact is connected to the trailing end of the conductor and insulated from the shank, and a second contact is secured to the shank, either on the side or the end of the shank. The punch holder includes a pair of corresponding contacts so that the punch is electrically connected to the press control circuitry when the punch is secured in the punch holder. The continuity of the electrical circuit is continuously monitored to determine if the tip of the punch has been broken. When the punch tip breaks, the press is immediately signaled and stopped before a significant number of defective parts are made. In one embodiment, a paint is located in the passageway of the punch so that it marks a part as being defective if the punch tip breaks.

REFERENCES:
patent: 1771418 (1930-07-01), Pope
patent: 1904951 (1933-04-01), Peterson
patent: 2738008 (1956-03-01), Heyman
patent: 3124026 (1964-03-01), Loeffel
patent: 3585886 (1971-06-01), McDonald et al.
patent: 3728919 (1973-04-01), Scott
patent: 4120196 (1978-10-01), Hamilton et al.
patent: 4420253 (1983-12-01), Pryor
patent: 4620281 (1986-10-01), Thompson et al.
patent: 4744241 (1988-05-01), Mayer
Exhibit A is a copy of a product brochure entitled "Ball Lock-Punches, Matrixes, Pilots, Retainers," published by Dayton Progress Corporation of Dayton, Ohio, dated Feb. 1985, disclosing a variety of punches and other tools including ball locks and holders for same.

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