Importance

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Abstract

A crank press with an adjustable stroke comprises a press frame having a frame slideways therewithin with a slider reciprocatively movable therealong and supported by a pneumatic cylinder. In order to significantly increase a working force, a length of the working stroke and efficiency, the crank press further comprises: at least two mutually synchronized crank drives configured for reciprocatively moving the slider along the frame slideways, a lever-crosspiece mechanism having at least one pair of threaded guide stanchions secured within the frame bed, a crosspiece slidably mounted on the guide stanchions atop the slider, at least two two-arm levers hingedly connected to the slider supportadly on the crosspiece, at least one pair of crosspiece stop nuts engaged with threads of the guide stanchions and configured for arresting the cross-piece at the moment of applying a force to the slider by the lever and a switching arrangement for slider reversal with regulation of its stroke.

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First Claim