Metal deforming – With use of control means energized in response to activator... – Sensing tool or tool-linked part
Patent
1980-03-03
1982-01-05
Larson, Lowell A.
Metal deforming
With use of control means energized in response to activator...
Sensing tool or tool-linked part
72 20, 7245318, 100259, B21J 920
Patent
active
043087353
ABSTRACT:
An automatic pressure control apparatus for a counterbalancer of a press having a movable portion including a crank, a connecting rod, a slide and an upper die detachably mounted on the slide, the apparatus comprising a cylinder mounted on a frame of the press, a piston rod of the cylinder being connected to the slide, a tank for pressurized fluid connected to a source of pressurized fluid and a rod-side chamber of the cylinder, a pressurized fluid supply and ventilation control unit disposed between the source of the pressurized fluid and the tank, the unit having a pilot operated main regulator valve for regulating the pressurized fluid flowing therethrough, a plurality of pilot regulator valves connected with the main regulator valve for controlling the same, a detector for detecting the amount of displacement of a reference point given on the movable portion of the press in a preselected posture thereof in response to the interchange of the upper dies with varying weights, and a solenoid valve for selectively operating the pilot regulator valve in response to a detected signal detected by the detector.
REFERENCES:
patent: 3825811 (1974-07-01), Smith et al.
patent: 4011809 (1977-03-01), Waller et al.
Kabushiki Kaisha Komatsu Seisakusho
Larson Lowell A.
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