PRESS MACHINE
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United States of America Patent
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Issued Date -
Mar 4, 2021
app pub date -
Jul 16, 2020
filing date -
Sep 2, 2019
priority date (Note) -
Published
status (Latency Note)
Importance
Abstract
The press machine includes: a hydraulic cylinder configured to drive a slide; a plurality of hydraulic pumps/motors; a first port of each of which is connected to a first pressurizing chamber of the hydraulic cylinder; a plurality of servomotors axially connected to rotating shafts of the respective hydraulic pumps/motors respectively; a low-pressure accumulator to which second ports of the hydraulic pumps/motors are each connected; a high-pressure accumulator connected to a second pressurizing chamber of the hydraulic cylinder; and a slide position controller configured to control the servomotors so that a position of the slide matches a position corresponding to a slide position command signal based on the slide position command signal from a slide position commander and a slide position signal from a slide position detector.
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Cited Art Landscape
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