Drop deflection device and method for drop marking systems

Recorders – Performance of multiple functions of steam and gas engines – Pressure responsive element

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346 75, 239690, G01D 1518, B05R 500

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active

048455121

ABSTRACT:
A drop deflection device suitable for use in a drop marking system employs an electret. Electrically conductive marking drops such as inks are given an electrical charge. The drops pass between a pair of deflections plates at least one of which is formed by an electret (a dielectric material which has been subjected to corona discharge to create a relatively permanent electrically charged material body). Depending upon the presence or absence of a charge on a particular drop, it will be deflected by the field between the plates on to a substrate for marking. If uncharged, the drops continue to a collection device which returns them to the ink reservoir.

REFERENCES:
patent: 4121222 (1978-10-01), Diebold et al.
patent: 4319251 (1982-03-01), Arway et al.
patent: 4555712 (1985-11-01), Keur
patent: 4764690 (1988-08-01), Murphy et al.
"Electrostatics and Its Applications", A. D. Moore, Editor John Wiley & Sons: New York (pp. 122-129), 1973.

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