Device for correcting die spacing at bottom dead center of a pre

Details Device for correcting die spacing at bottom dead center of a pre Device for correcting die spacing at bottom dead center of a pre

1992-06-29

1993-12-14

Larson, Lowell A.

Metal deforming

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

Sensing tool or tool-linked part

72441, 72446, 100 99, 100 53, B21J 740

Patent

active

052691632

ABSTRACT:
An apparatus for use with a press which corrects the spacing between an upper die and a lower die when the press is at bottom dead center. The apparatus includes a detector which is operative during each cycle of reciprocal movement of the press slide to detect the spacing between the upper and lower dies, a comparator which compares the detected spacing during each cycle with a prior spacing, an axially expansible/contractible piezoelectric actuator mounted on the press so that its axial length affects the spacing between the upper and lower dies when the press is at bottom dead center, and a drive circuit which is responsive to a deviation signal from the comparator to drive the actuator with a high voltage so as to expand or contract its axial length according to the difference between the detected and prior spacing of the dies.

REFERENCES:
patent: 3196647 (1965-07-01), Schneider
patent: 3473466 (1969-10-01), Thayer
patent: 3952215 (1976-04-01), Sakitani
patent: 4377084 (1983-03-01), Kaminski
patent: 4531901 (1985-07-01), Andersen
patent: 4622484 (1986-11-01), Okihara et al.
patent: 4676090 (1987-06-01), Nishimura et al.
patent: 5095725 (1992-03-01), Wada et al.
patent: 5113756 (1992-05-01), Fujii

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