Patent ID: 7469639

Claim:
A printing device comprising: a main body having a plurality of nozzle units, wherein the main body further comprises a plurality of sub bodies, each sub body having a sub nozzle unit; a plurality of accommodation grooves within the main body and configured to contain a printing material; at least one slit in each nozzle unit, wherein each slit is in fluid communication with one of the accommodation grooves, so as to enable coating of the printing material onto a printing object directly through the at least one slit; a plurality of sub supply tubes coupled to each accommodation groove and configured to supply the printing material to the plurality of accommodation grooves; a sub valve residing in each sub supply tube and configured to variably control an amount of printing material flowing out of the printing device, and a spacer between each sub body, wherein a width of the spacer determines a slit size of the nozzle unit.