Electronic braking system for power press die change carriers

Details Electronic braking system for power press die change carriers Electronic braking system for power press die change carriers

1990-10-22

1992-05-19

Jones, David

Metal deforming

With means to drive tool

With means to permit tool positioning

72446, 100918, 100229R, B21J 1308

Patent

active

051136848

ABSTRACT:
The invention provides an automatic die changing system for a power press with at least one carrier for transporting dies to and from a selected location in the press. The carrier is supported on a set of wheels, which are driven by at least one AC induction motor. An adjustable frequency AC motor drive supplies an AC frequency and voltage to the AC induction motor to control the speed of the motor and therefore the speed of a horizontal movement of the carrier into or out of the press. The speed of the carrier may be rapidly increased by increasing the AC frequency supplied to the motor on the individual wheels. A proximity detector signals the motor drive to trip a dynamic braking resistor, which electronically changes the phase order of the motors to reverse the direction of motor rotation, to decelerate the carrier in order to locate the carrier in the proper position.

REFERENCES:
patent: 3002479 (1961-10-01), Johansen et al.
patent: 3207065 (1965-09-01), Danly
patent: 3368479 (1968-02-01), Gregorovich
patent: 3841142 (1974-10-01), Aisuta et al.
patent: 4360536 (1986-12-01), Shah
patent: 4408521 (1983-10-01), Schelli et al.
patent: 4614108 (1986-09-01), Bolle et al.
patent: 4660406 (1987-04-01), Rugh et al.
Allen-Bradley Product Data Publication 1336-2.4-Apr. 1990; Bulletin 1336 Adjustable Frequency AC Drive.
Allen-Bradley Product Data Publication 13364-2.0-Nov. 1986; Bulletin 1334 Adjustable Frequency AC Motor Drives.
Allen-Bradley Kit Instructions Publication 1334-5.0.46-Apr. 1989; 1334-MOD-K8 15 & 20HP Series A Dynamic Brake.
Allen-Bradley Selection Data Publication 1333-2.4-Oct. 1989; Bulletin 1333 Heavy Duty Dynamic Braking.

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