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Charging Method for Ink Jet Printer

IP.com Disclosure Number: IPCOM000080929D
Original Publication Date: 1974-Mar-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Eller, CP: AUTHOR

Abstract

A charge may be applied to ink drops in an ink jet printer, by connecting a length of metal tubing 10 located as close to the nozzle as possible, to a source of direct-current potential through a transistor T1 and grounding the ink at a point G in the system, such as at the valve 12. R1 is the resistance to ground of the ink in the plastic tubing 14 connecting the grounded point G to the metal tubing 10. A value of about 1.0 megohms has been found satisfactory. The emitter resistor R2 will usually be of such a low value relative to R1, that small variations of R1 will have little effect on the amplitude of the charging pulses. A shield 16, having an opening through which ink drops are projected, eliminates any interaction between the deflection plates 18 and the tubing 10.

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Charging Method for Ink Jet Printer

A charge may be applied to ink drops in an ink jet printer, by connecting a length of metal tubing 10 located as close to the nozzle as possible, to a source of direct-current potential through a transistor T1 and grounding the ink at a point G in the system, such as at the valve 12. R1 is the resistance to ground of the ink in the plastic tubing 14 connecting the grounded point G to the metal tubing 10. A value of about 1.0 megohms has been found satisfactory. The emitter resistor R2 will usually be of such a low value relative to R1, that small variations of R1 will have little effect on the amplitude of the charging pulses. A shield 16, having an opening through which ink drops are projected, eliminates any interaction between the deflection plates 18 and the tubing 10.

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