Patent ID: 7357013

Claim:
A marking device for encoding a metallic workpiece with a two-dimensional matrix code, comprising: a striking tool; an electromagnetic device for driving the striking tool, with a working movement, to form the two-dimensional matrix code, as plural indentations, in the metallic workpiece; a return device for generating a force in opposition to the working movement; a positioning device, displaceable in two dimensions within a plane perpendicular to the direction of the working movement, for positioning the striking tool in a desired encoding position; and an electronic control unit for controlling the working movement of the striking tool, said electronic control unit setting a first current I 1 for the electromagnetic device during a first, acceleration phase of the working movement and setting a second current I 2 , lower than the first current, during a second, moving phase of the working movement, the second, moving phase extending from the first, acceleration phase until impingement of the striking tool on the metallic workpiece.