Browse Prior Art Database

Closed Loop Operation of Ink Jet X, Y Printer

IP.com Disclosure Number: IPCOM000084907D
Original Publication Date: 1976-Jan-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Miranker, GS: AUTHOR

Abstract

This is an alignment procedure which compensates for the nonlinearity in an X-Y ink jet printer by adjusting the X, Y deflection currents.

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Closed Loop Operation of Ink Jet X, Y Printer

This is an alignment procedure which compensates for the nonlinearity in an X-Y ink jet printer by adjusting the X, Y deflection currents.

A sensing device such as a photodiode array 2 is positioned in place of a printing medium for purposes of alignment. The array is an X-Y matrix of N rows and M columns. A sheet of transparent plastic, not shown, is placed over the array 2, and in response to an ink droplet striking the transparent plastic, a certain element of the matrix is obscured.

A two-byte word is then transmitted from the array 2 to a computer 4, with the first byte indicating the row and the second byte indicating the column of the sense element that is obscured, The transparent plastic must be moved between each droplet being emitted, to insure that the array 2 is not obscured by more than one droplet at a time such that proper sensing takes place.

The computer 4 communicates with an interface device such as a pulse sequence generator 6 which drives the ink jet printer and an output device such as a printer 8.

The computer 4 transmits X-Y position information to the generator 6 via a plurality of data lines 10. The computer provides a pulse on a data ready line 12 when the computer is ready to transmit information to the generator, and the generator 6 provides a pulse out on an external sync line 14 when ready to receive information.

The computer 4 also provides information indicative of alignment accuracy...