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Ink Jet Start Up and Shutdown

IP.com Disclosure Number: IPCOM000084529D
Original Publication Date: 1975-Nov-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Titcomb, SC: AUTHOR

Abstract

An ink jet head is shown which employs a variable frequency "oil can" transducer mechanism to start-up and shutdown the jet flow of a pressure ink jet system.

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Ink Jet Start Up and Shutdown

An ink jet head is shown which employs a variable frequency "oil can" transducer mechanism to start-up and shutdown the jet flow of a pressure ink jet system.

"Oi1 can" pressure transducers are normally arranged to eject single drops from a nozzle on demand. Here, the object is to combine the oil can effect with the Rayleigh instability effect of jet streams, to provide a continuously stable drop stream during start-up and shutdown. In this manner, large globs associated with start-up can be avoided.

The oil can driver 10 is schematically shown as a reciprocating piston. However, it could be another crystal or any suitable means. The piston is initially driven at a frequency generally less than 5 KHz. Since the drop generation is physical in nature, the first drop is stable. The ink pressure and frequency are then increased in a proscribed manner so that the drop generation remains stable.

During this period the oil can drive amplitude is decreased and the regular drive 11 increased until, at the desired frequency and drive voltage, the regular conditions prevail and the oil can drive 10 is disengaged. In this manner an orderly start has been achieved. During this start cycle three regions of operation have occurred: 1 - The oil can drive 10 is used until the jet velocity is high enough to produce stable drops. 2 - In the interim period the oil can drive 10 decreases and the Rayleigh instability increases. The frequency is

increased...