Hydraulic control for press brakes

Details Hydraulic control for press brakes Hydraulic control for press brakes

1993-03-12

1995-07-18

Jones, David

Metal deforming

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

Sensing tool or tool-linked part

72 19, 7245301, 100 48, B21T 728

Patent

active

054330971

ABSTRACT:
A method and apparatus for controlling the stopping position of a press brake punch is provided. Hydraulic control is provided so that the variations in punch stopping positions due to variations in manifold valve response times are minimized. A variable displacement hydraulic pump and a solenoid valve are used in conjunction with manifold valves in order to precisely stop a press brake punch. When it is desired to stop the punch, the solenoid valve is shifted and pump output begins to decrease before the manifold valves begin to shift.

REFERENCES:
patent: 2192778 (1940-03-01), Stacy
patent: 2290743 (1942-07-01), Ernst
patent: 2396296 (1946-03-01), Stacy
patent: 3343217 (1967-09-01), Daubenberger
patent: 4116122 (1978-09-01), Linder et al.
patent: 4831862 (1989-05-01), Ohashi et al.

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