Brake timing control method and apparatus therefor

Details Brake timing control method and apparatus therefor Brake timing control method and apparatus therefor

1978-11-28

1981-01-20

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318626, 192140, 192142R, 100 48, H02P 300

Patent

active

042465230

ABSTRACT:
Disclosed is a brake timing control method and apparatus for use with a press machine including a press slide driven through a crank shaft by a variable speed motor to stop the moving press slide at its top dead center regardless of the speed of rotation of the crank shaft. The motor speed is detected and converted into a voltage proportional to the motor speed which is then integrated as a first voltage. A second voltage is provided in accordance with a line or curve representing as a function of motor speed the approximation of the slip angle through which the crank shaft will continue to rotate after braking is initiated. The first and second voltages are additively combined and compared with a reference voltage to provide a stop signal for initiating braking on the press machine when the sum of the first and second voltages reaches the reference voltage.

REFERENCES:
patent: 2816635 (1957-12-01), Danly et al.
patent: 3277355 (1966-10-01), Troutman et al.
patent: 3450911 (1969-06-01), Smith
patent: 3761790 (1973-09-01), Daab
patent: 3795853 (1974-03-01), Whitehouse
patent: 3872365 (1975-03-01), Vignaud et al.
patent: 3893695 (1975-07-01), Rickert
patent: 4022307 (1977-05-01), Berrie et al.
patent: 4040508 (1977-08-01), Sunada et al.

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