Marking apparatus with multiple marking modes

Marking apparatus and method is described wherein an array of marker pins are carried by translational assembly which, in turn, is driven from stepper motors which perform in conjunction with high helix lead angle lead screws. Solenoid actuated pneumatic valves are employed to actuate the marker pins within an array thereof and the entire assemblage of motors, valves, translational mechanism, and control features are retained within a compact housing structure. The control system and associated translational mechanism is capable of driving the marker head assembly in matrix, raster, and continuous modes of operation. Speed of marking is enhanced through the employment of a masking procedure wherein the translational mechanism drives the marker head assembly only to locations where active character forming pixels are present.