Head assembly for a jet drop recorder

Details Head assembly for a jet drop recorder Head assembly for a jet drop recorder

G - Physics

01

D

101/96.021

G01D 15/16 (2006.01) B41J 2/025 (2006.01) G01D 15/18 (2006.01)

Patent

CA 1064091

HEAD ASSEMBLY FOR A JET DROP RECORDER Abstract Of The Disclosure A jet drop recorder has a head assembly which generates, charges, and switches rows of jet streams arranged along angularly oriented placement lines. The spacing and angularly orientation of the placement lines are sel- ected so as to produce an effectively uniform side-by-side spacing for the drop streams arranged along the placement lines. Each placement line may include a large number of drop streams, so that there is produced a recording head capable of high resolution recording. The drop streams are created and selectively charged by an orifice plate and a charge ring plate having orifices and charge rings in mutual registration. Below the charge ring plate there is a deflection electrode assembly comprising an insulative member provided with a series of angularly arranged teeth. Deflection electrodes are plated on opposite sides of the teeth and connected to sources of different electrical potential for generation of electrical deflection fields. Drops which are charged by application of a charging signal to their associated charge ring are deflected by the deflection field through which they are directed. The lower surfaces of the aforementioned teeth are configured to define catchers for drops directed there- toward. In one embodiment the catchers catch charge drops, and printing is effected by deposition of uncharged drops on a recording medium transported below the recording head. In an alternative embodiment the catchers catch uncharged drops, and printing is accomplished by deposition of charged drops on the recording medium. -1-

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