Patent ID: 7618117

Claim:
A printer comprising: a first drive sub-assembly comprising: a bed having a first guide rail and a second guide rail extending in a front-rear direction thereof and configured to support a material to be printed; a first engaging member including a main member having a first pair of guide rollers configured to pivot about axes extending in a right-left direction perpendicular to the front-rear direction and a second pair of guide rollers configured to pivot about axes extending in a vertical direction that is substantially perpendicular to the right-left direction and the front-rear direction, said first pair of guide rollers mating with said first guide rail, and said second pair of guide rollers receiving therebetween and mating with said second guide rail; and a front-rear direction moving mechanism provided on one side of the bed and configured to move the first engaging member along the front-rear direction; and a second drive sub-assembly detachably provided on the first drive sub-assembly and comprising: a guide bar having a longitudinal direction substantially perpendicular to the front-rear direction; a printer head; a right-left direction moving mechanism configured to move the printer head along the longitudinal direction of the guide bar; and a second engaging member engaging with the first engaging member to move the guide bar along the front-rear direction, wherein one of the first engaging member and the second engaging member includes an engaging projection and the other of the first engaging member and the second engaging member includes an engaging hole that is configured to receive the engaging projection therein when the second engaging member is engaged to the first engaging member, and wherein the engaging projection extends in the vertical direction.