Patent ID: 8657397

Claim:
A portable device for printing an image in a print area provided on a material substrate, said device comprising at least one pen equipped with a printing head that is manually positionable in said print area, at least one removable benchmark manually positionable on said substrate and associated with a corresponding point of said image to be printed by a predefined relationship independent of a position of said benchmark on said substrate, a measurement unit for measuring a position of said printing head suitable for measuring the position of said printing head relative to said benchmark, a control unit for controlling said printing head and configured for controlling printing of a predefined image point on said substrate, said control unit being suitable for determining said image point to be printed according to a real measured position of said printing head relative to said benchmark, and a predefined relationship that associates said image point with said benchmark, wherein said control unit is configured for determining a distance between said pen and said substrate from said measurement of said position of said printing head and for preventing printing of said image on said substrate if said distance is greater than a predefined threshold.