Importance

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Abstract

A press machine comprises: a crankshaft having plural eccentric shaft portions in the same phase; a slide, on which a die is to be held, disposed along the crankshaft and guided to be vertically movable; motion conversion mechanisms, in which adjusting means are, respectively, incorporated to make the bottom dead center position of the slide variable, provided in parallel between each eccentric shaft portion and the slide so as to convert the rotation of the crankshaft into the vertical motion of the slide; bottom dead center position detecting devices for detecting the dead center position of the slide at each of points spaced apart from each other in the longitudinal direction of the slide; and a control circuit for controlling the action of the adjusting means of one of the conversion mechanisms, based on a signal from each bottom dead center position detecting means.

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First Claim