Direct printing apparatus

摘要

A direct printing apparatus 2 for depositing printing particles 38 on a print medium 8 comprises a sleeve 30a for bearing charged printing particles 38 thereon, a drive roller 30b provided in the sleeve 30a, the drive roller 30b having a smaller outside diameter than an inside diameter of the sleeve 30a, a backing electrode 44 opposed to the sleeve 30a, a printing head 50 disposed between the sleeve 30a and the backing electrode 44, the printing head 50 having a plurality of apertures 56 through which the printing particles 38 can propel and a plurality of electrodes 68 disposed around the plurality of apertures 56. A spacer 104 is provided between the sleeve 30a and the printing head 50. The sleeve 30a has a slack 31 through which the sleeve 30a comes into contact with the spacer 104.