JPS5666335A - Detector-controller for clearance - Google Patents

Abstract

PURPOSE: To detect the rising slug, and to suitably control the action of the press machine, by installing the detector in the bottom surface of the moving stripper of the press die unit, and by detecting the clearance between the die and the moving stripper reciprocating against this die through the work.

CONSTITUTION: The detectors 21aW21d are installed at four corners of the bottom surface of the moving stripper 9 of the press die unit so as to sink to 1mm depth from the bottom surface. These detectors are located outside the work 3 and directly face to the upper surface of the die 2 placing a distance; hereby, the detectors always detect the clearance (d) between the upper surface of the die 2 and the bottom surface of the moving stripper 9. When the detected value is smaller than the value, 1mm plus thickness of the work 3, the control device does not produce the signal; if the slug 3b exists, the value (d) becomes larger than the value, 1mm plus thickness of the work 3, and it is detected by the detector which then produces a signal. By this signal, the motor for driving the press machine is stopped; hereby, the damage of the stripper 9 and the die 2, owing to existence of the slug generated by the press work, is automatically prevented.

COPYRIGHT: (C)1981,JPO&Japio