Machine for chamfering pieces of hide, leather and synthetic materials of small thickness, particularly for shoe and leather factories

A machine for chamfering pieces of hide, leather and synthetic materials of small thickness, particularly for shoe and leather factories comprising, within a box-shaped body, a rotary cup-shaped blade, a feed roller for feeding pieces to be chamfered, disposed at right angles and inside said cup-shaped blade with one generatrix thereof substantially on a level with the cutting edge of the blade, a guide foot or guide roller for the material fed thereto, placed above said cup-shaped blade, a grinder to sharpen the cup-shaped blade, disposed laterally to the latter, and a member suitable to dress the grinder surface characterized in that said rotary cup-shaped blade, said material feed roller, said guide foot and said grinder are kinematically disconnected from each other, as they are driven by independent power units, in that said member to dress the grinder surface is provided with adjustment means adapted to set the positioning thereof and in that the foot and the corresponding stop device can repeatedly carry out diversified operating phases on the workpiece according to different operating programs previously stored in electronic means, said phases being suitable to be repeated at will according to a control on the part of the operator, the automatic working being arranged to be interrupted at any moment in order to carry out a different single working of the same members and to be restored, after such single working, according to the programmed cycle, said electronic means being also able to detect the reference position of the cup-shaped blade and to determine the different positionings of same according to its wear and to the pieces to be worked by means of either continuous or stepped displacements of said blade.