US Patent No: 6,085,520
Number of patents in Portfolio can not be more than 2000
Slide driving device for presses
Stats
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Jul 11, 2000
Issued date -
Nov 18, 1997
filing date -
08/972,813
serial no -
In Force
status
Importance
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Abstract
A slide driving device employs a variable-displacement pump/motor for driving a rotating element of the slide driving device. The displacement volume of the variable-displacement pump/motor, whose output drives the slide, is varied in response to deviation of measured driver parameters from commanded driver parameters. An energy storage device temporarily absorbs excess energy during a portion of a molding cycle, and returns the energy to the system for re-use. In one embodiment, the energy storage device is an accumulator. In a second embodiment, the energy storage device is a flywheel. The combination of variable displacement volume and energy storage maintains the fluid pressure substantially constant during a cycle of the slide driving device.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 5,460,084 Method for controlling the drive of a hydraulic press | 8 | 1994 | |
| 5,568,766 Method for controlling the drive for a hydraulic press having a plurality of operating phases | 20 | 1994 | |
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| 5,794,442 Adaptive fluid motor control | 32 | 1996 | |
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| 5,499,525 Hydraulic drive for a sheet metal forming press | 7 | 1994 | |
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| 5,526,738 Hydraulic press with flywheel | 5 | 1994 | |
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| 4,563,889 Screw press | 6 | 1984 | |
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| 4,215,543 Method and apparatus for linear and nonlinear control of a hydraulic press | 4 | 1979 | |
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| 4,209,987 Hydraulic screw press drive | 6 | 1978 | |
| 4,208,895 Method and apparatus for controlling a hydraulic screw press | 10 | 1978 | |