Browse Prior Art Database

Initialization of Ink Jet Deflection Servo

IP.com Disclosure Number: IPCOM000079953D
Original Publication Date: 1973-Oct-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Naylor, HE: AUTHOR

Abstract

Methods of deflection adjustment for an ink jet system require that deflected drops pass by a sensor which measures height. G. A. Ruddy has proposed utilizing the height of certain characters to adjust deflection in the article entitled "Position and Synchronization Sensor for an Ink Jet Printer", IBM Technical Disclosure Bulletin, February, 1973, Vol. 15, No. 9, Pp. 2785-2786. The present method represents a simple way to adapt planar plate sensors to do this job by making them adjustable in height.

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Initialization of Ink Jet Deflection Servo

Methods of deflection adjustment for an ink jet system require that deflected drops pass by a sensor which measures height. G. A. Ruddy has proposed utilizing the height of certain characters to adjust deflection in the article entitled "Position and Synchronization Sensor for an Ink Jet Printer", IBM Technical Disclosure Bulletin, February, 1973, Vol. 15, No. 9, Pp. 2785-2786. The present method represents a simple way to adapt planar plate sensors to do this job by making them adjustable in height.

The basic idea of a planar plate sensor is to have two large plates with a small gap between them located to one side of a stream, as shown in Figs. 1a and 1b.

Sensing the height of certain characters is difficult at times, since character height within a font and from font-to-font varies. A solution to font size variation is to modify the sensor of Figs. 1a and 1b, as shown in Fig. 2. Analog switches (AS1, AS2, AS3 and AS4) in Fig. 2 are controlled by the machine's logic. Normally all switches but one are closed. An "0" pin switch selects which gap is in active use.

Another application for this type of sensor, is in the adjustment in character size that might be required when changing a machine from 12 point to 10 point type and vice versa, which this sensor allows to be done automatically.

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