Source : Webster's Revised Unabridged Dictionary (1913)

Tacker \Tack"er\, n.
   One who tacks.

Source : WordNet®

tacker
     n 1: a worker who fastens things by tacking them (as with tacks
          or by spotwelding)
     2: a sewer who fastens a garment with long loose stitches [syn:
         {baster}]
     3: a hand-held machine for driving staples home [syn: {staple
        gun}, {staplegun}]