Press with control circuit arrangement

Details Press with control circuit arrangement Press with control circuit arrangement

1990-06-27

1992-05-26

Hornsby, Harvey C.

Presses

Automatic or material triggered control

100 48, 100 99, 100231, 100292, 318369, B30B 1526

Patent

active

051157357

ABSTRACT:
A press (2) having a three phase, brushless, direct current drive motor (26) driving a press ram (22) by a way of an eccentric shaft (78) is provided with a control circuit arrangement (89) comprising an incremental encoder (30) for measuring the angular position of the drive shaft (78), and Hall effect sensors (94) for continuously measuring the speed of the drive motor (26). The control circuit arrangement (89) also comprises a computer (108) having registered therein a desired motor speed program (112), and a motor control circuit (104) for comparing the outputs of the encoder (30) and the sensors (94) with the program (112) and feeding the result of the comparison to a motor drive pulse generator (96) to control the speed of the motor (26) in accordance with the program (112) and to stop motor (26) upon the press ram (22) reaching a position at least proximate to its home position (0.degree.) at the end of a cycle thereof.

REFERENCES:
patent: 3184950 (1965-05-01), Litz
patent: 3906315 (1975-09-01), Gotisar
patent: 4062213 (1977-12-01), Schneider et al.
patent: 4246523 (1981-01-01), Nagai
patent: 4438377 (1984-03-01), Sakai et al.
patent: 4691653 (1987-09-01), Neki et al.

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