This paper concerns the study and design of a human powered press for raw earth compressed blocks. The first section considers a commercial model of such a press, in order to emphasize all necessary operations for the production of raw earth bricks, as well as the functional characteristics required to realize blocks of good quality. In particular, a kinematic analysis of the cam-roller mechanism used in the bi-directional compression phase is presented. In the second section a new solution of bi-directional press is proposed, aimed at simplifying the machine architecture, reducing costs and achieving an optimized functionality.

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