Device for processing of materials by cutting and cutting unit with oscillating cutting knife and variable cutting angle of inclination

A device for the cutting of material on a plane material supporting surface, the device having the plane material supporting surface and at least one cutting unit, wherein the at least one cutting unit can be motor-driven in a controlled manner above and across the material supporting surface in a direction of an X- and Y-axis of a Cartesian coordinate system that is parallel to the material supporting surface, wherein the at least one cutting unit is mounted on a carrier and wherein the carrier is controllably movable in the direction of the X-axis and Y-axis of the Cartesian coordinate system, wherein the at least one cutting unit comprises an oscillation drive and a cutting knife, wherein the oscillation drive sets the cutting knife into linear oscillations having an oscillation axis that is perpendicular to an advancing direction of the cutting knife, wherein for changing an angle of inclination of the oscillation axis with respect to the material supporting surface the oscillation drive with the cutting knife is pivotable around a pivot axis that is parallel to the material supporting surface, wherein the oscillation drive comprises an electric motor having a rotary drive shaft that is parallel to the material supporting surface, wherein the rotary axis of the rotary drive shaft is aligned with the pivot axis, wherein the cutting unit comprises a linearly guided knife holder and further comprises a cam between the rotary drive shaft of the oscillation drive and the knife holder, wherein the cam converts the rotation of the rotary drive shaft into an oscillating movement of the knife holder along the oscillation axis, wherein the cam comprises an eccentric ring, wherein the eccentric ring is fixedly connected to the rotary drive shaft, and wherein the eccentric ring has an inner cylindrical surface that is concentric to the rotary axis of the rotary drive shaft and has an outer surface cylindrical surface that is eccentric to the rotary axis of the rotary drive shaft.