Slide driving device for presses
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United States of America Patent
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-
Jul 11, 2000
Grant Date -
N/A
app pub date -
Nov 18, 1997
filing date -
Apr 21, 1997
priority date (Note) -
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status (Latency Note)
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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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