Patent ID: 8857951

Claim:
A large-format printing apparatus, comprising: a control system; and a plurality of printing head units spacedly positioned along a second direction and controlled by said control system to move in a first direction, wherein each two of said adjacent printing head units are dis-aligned along said second direction, wherein said control system is configured to individually drive said printing head units to move periodically and steppingly in said first direction, wherein each of said printing head units comprises a printing nozzle being moved reciprocatingly in said second direction for printing on a printing medium within an interval between two steps of the movement of said printing head units in said first direction, wherein said first direction is perpendicular to said second direction, wherein said printing head units are positioned at one end portion of said printing medium for printing on a predetermined printing zone to form a sub-image that said sub-images are combined seamlessly to form a large-format printing image.