| 摘要 |
A hydraulic press having a stationary center platen secured to a supporting framework and a plurality of movable platens disposed above and below the center platen. The movable platens are supported from the framework by a differential gearing system comprised of fixed-length roller chains secured to the platens and engaged with variable-sized overhead sprocket wheels mounted on a common shaft. The weight of each upper platen is counterbalanced by a corresponding lower platen.
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