Browse Prior Art Database

Drop Sensing Device

IP.com Disclosure Number: IPCOM000077981D
Original Publication Date: 1972-Oct-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Hasler, W: AUTHOR [+2]

Abstract

In an ink jet printer composing the characters of individual spots within a character matrix, the nonprinting ink droplets are fed to a gutter 1. This gutter 1 (Fig. 3) itself, or a filament 2 (Fig. 1) extending in a longitudinal direction of the gutter and fixed on two sides, or a spring wire 3 (Fig. 2) fixed on one side, is connected to a converter 4 for converting the impact force of the ink droplet into an electric signal. This converter can consist of one single (5, Fig. 1), or two (6, 7, Fig. 2), or four (8, 9, 10, 11, Fig. 3) piezo elements.

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Drop Sensing Device

In an ink jet printer composing the characters of individual spots within a character matrix, the nonprinting ink droplets are fed to a gutter 1. This gutter 1 (Fig. 3) itself, or a filament 2 (Fig. 1) extending in a longitudinal direction of the gutter and fixed on two sides, or a spring wire 3 (Fig. 2) fixed on one side, is connected to a converter 4 for converting the impact force of the ink droplet into an electric signal. This converter can consist of one single (5, Fig. 1), or two (6, 7, Fig. 2), or four (8, 9, 10, 11, Fig. 3) piezo elements.

Due to the multiple use of piezo elements the sensing result is improved, because both the impact force and the direction of the force can be determined. The sensing result is applied to a circuit, altering the phase position of droplet generation and voltage at the charging electrodes of the ink jet printer, or the level of the staircase waveform applied to the charging electrode.

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