Incremental printing of symbolic information – Ink jet – Ejector mechanism
Patent
1997-06-27
2000-06-27
Barlow, John
Incremental printing of symbolic information
Ink jet
Ejector mechanism
B41J 206
Patent
active
060798149
ABSTRACT:
A droplet-on-demand ink jet printer uses electrostatic tacking of a recording medium, such as paper, to achieve simultaneously precise holding of an aligned recording medium on a dielectric surface of a transport belt, thereby providing precise motion quality of the recording medium relative to the printer's printhead, and improved ink droplet placement on the recording medium. The transport belt is electrostatically charged with a charge of one polarity, so that an electrostatic pressure is generated which precisely holds the recording medium in an aligned position on the transport belt, after it is fed thereon, and concurrently induces a charge of opposite polarity on the ink droplets ejected by the printhead, thereby accelerating the droplets toward the recording medium. The accelerated droplets reduce transverse forces on the droplets, such as transverse airflows, and placement errors caused by the repulsion of incoming droplets by previously printed images are further reduced by migration of the charges of the printed droplets through the recording medium and consequent charge cancellation, so that droplet placement is improved.
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Castelli Vittorio R.
dejong Joannes N. M.
Lean Meng H.
Williams Lloyd A.
Barlow John
Brooke Michael S
Chittum Robert A.
Xerox Corporation
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