Here is some information about a few different print heads. It should help you understand a little more about how to interface to one. Of course, you will need the data sheet for your specific print head. That always seems to be the problem when I buy surplus.

http://americas.kyocera.com/KICC/tph...phcontrol.html
http://www.rohmelectronics.com/downl...3004-va30a.pdf

What you are attempting to do is difficult. Kind of seems like the equivalent of programming a PIC chip to be an lcd driver chip, only with the added complication of printing on moving media. But if spending 40 plus hours building something you could buy for less than $40 sounds exciting, you will learn a lot!

Let us know how it goes.

Walter