Patent ID: 7108370

Claim:
A sensor and print-head assembly comprised in a housing for a hand-held and hand-operated printing device controlled by a processor, comprising at least one sensor means, a print-head array, input means on said housing connected to said processor for input of assembly control commands, and means for keeping track of the assemblies and print-heads position on a print medium, characterized in that it comprises for a print out sweep with said array: means for determining the x and y coordinates for at least one distal end of at least one row of printing means in said print head array, and the angle of rotation of said row with reference to a base line, made up of coordinates for the long side of an image stored to be printed, whereby every dot of a part of an image to be printed having determinable corresponding x and y coordinates related to a determined position for said row; means for determining an x and y coordinate for a first tangent of said row with the first part of said image to be printed, and at least one second tangent for said image in relation to a mathematically defined configuration relating to the rotation angle of the row and said distal end, said second tangent making up a boundary for when a print out of said part image should take place; means for determining if said row during movement is closing in to said second tangent from the clockwise or counter clockwise direction; means for providing a print out decision for a subsequent part image to be printed through said print-head in front of a print out, if the row is closing in clockwise to the second tangent when using the upper distal end of the row as reference for the second tangent, and the vice versa when using the lower distal end as reference for a sweep.