Abstract: A new and improved print head apparatus for applying ink in a selectively controlled matrix of dots to form letters, numbers, characters and symbols onto packages, containers and the like, which is compact in size and adapted for rapid, accurate movement with controllable ink flow therethrough.

Abstract: A new and improved automatic label printing apparatus for printing a label onto various types and shapes of packages and containers including a probe unit adapted to have mounted therewith a printing head. The probe unit is mounted for movement in three mutually perpendicular directions for locating a printable area on a container and for thereafter indexing the probe and printing head over the printable area for applying a label thereto. The probe unit is releaseably mounted to break away from its normal directional movement in order to prevent probe damage. In an alternate embodiment of this invention, a label printing apparatus is provided for printing a label onto a curved surface. And, in a further alternate embodiment, label printing apparatus is provided for printing a label at a rate coordinated with conveyor speed.