System for monitoring the position of a machine component

Details System for monitoring the position of a machine component System for monitoring the position of a machine component

1989-02-27

1990-03-13

Jones, David

Metal deforming

With use of control means energized in response to activator...

Sensing tool or tool-linked part

72 19, 364476, B21J 920

Patent

active

049074350

ABSTRACT:
A system for monitoring the position of a machine component, provided with an electrohydraulic drive system which, in order to control the forward and backward movements of this machine component, comprises a follow-up adjusting valve that operates with an electrically-controlled indication of the set value and with a mechanical announcement of the actual position. The monitoring system is provided with a mechanical conversion device which converts the deflections of the servocomponent of the follow-up adjusting valve into larger deflections, correlated therewith, of the mechanical operating element of a proximity switch which, seen in the deflection direction of its operating element, is arranged at a defined distance in relation to the position adopted by the operating element when the servocomponent of the follow-up adjusting valve is located in its characteristic basic setting for equivalence of the set and actual value. The proximity switch envisaged is a Hall generator, into whose field aperture projects the edge of a switching arm which can be driven rotationally by the deflection movements of the servocomponent of the follow-up adjusting valve.

REFERENCES:
patent: 4148203 (1979-04-01), Farazandeh et al.
patent: 4208895 (1980-06-01), Grigorenko et al.
patent: 4510570 (1985-04-01), Yonekura
patent: 4692857 (1987-09-01), Chi
patent: 4819467 (1989-04-01), Graf et al.

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