Electric heating – Metal heating – Cutting or disintegrating
Patent
1992-11-09
1994-06-28
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
226 45, 242 45, 242 7551, 242 7553, B73H 710
Patent
active
053249097
ABSTRACT:
An apparatus for measuring and/or controlling the tension in a ribbon or wire-type electrode of an electric discharge machine in which the ribbon or wire-type electrode is passed around a rotatable roller which is in operative engagement with a sensor. The roller is adapted to be driven in rotation by a motor or to be retarded by a brake. A support member for the roller and the motor or for the roller and the brake accommodates the weight of the roller and the motor or of the roller and the brake so that no load caused by the motor or the brake plus the roller acts in the direction of the tensile stress of the electrode. Any movement of the support means can be detected by a sensor, and the magnitude of the tension can be derived by a control unit from the output signal of the sensor. In operation, the control unit determines the tension on the wire and causes the unit to either increase or decrease the resistance caused by the roller.
REFERENCES:
patent: 4262185 (1981-04-01), Delpretti
patent: 4530471 (1985-07-01), Inoue
patent: 4667078 (1987-05-01), Kilcher et al.
patent: 5039834 (1991-08-01), Obara et al.
patent: 5240194 (1993-08-01), Noirot et al.
AG fur industrielle Elektronik AGIE Losone bei Locarno
Dougherty Ralph H.
Evans Geoffrey S.
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