A control apparatus for controlling a die cushion mechanism including a servo-motor as a drive source and producing a force adapted to be applied outside. The control apparatus includes a force commanding section for commanding a force to be produced by the die cushion mechanism; a force detecting section...http://www.google.co.uk/patents/US7631528?utm_source=gb-gplus-sharePatent US7631528 - Die cushion mechanism, and apparatus and method for controlling the same
