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Meniscus Film Ink Jet Printer

IP.com Disclosure Number: IPCOM000044236D
Original Publication Date: 1984-Nov-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Findlay, HT: AUTHOR

Abstract

Ink droplets are produced from a relatively large orifice to avoid the problems of ink congealing or drying in a nozzle that could prevent droplet formation while still obtaining good character definition from the relatively large orifice. A round disc 1, which has holes 2 formed therein adjacent its circumference and equally angularly spaced from each other, rotates about its center through a tank 3 having ink therein to pick up ink on both of its surfaces. As shown in Fig. 3, a meniscus ink film 4 is formed in each of the holes 2 in the disc 1 as they pass through the tank 3 (Fig. 1). It should be understood that wipers (not shown) are supported by the tank 3 to remove all of the ink from both surfaces of the disc 1 other than the ink within each of the holes 2. An air jet 5 (Fig.

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Meniscus Film Ink Jet Printer

Ink droplets are produced from a relatively large orifice to avoid the problems of ink congealing or drying in a nozzle that could prevent droplet formation while still obtaining good character definition from the relatively large orifice. A round disc 1, which has holes 2 formed therein adjacent its circumference and equally angularly spaced from each other, rotates about its center through a tank 3 having ink therein to pick up ink on both of its surfaces. As shown in Fig. 3, a meniscus ink film 4 is formed in each of the holes 2 in the disc 1 as they pass through the tank 3 (Fig. 1). It should be understood that wipers (not shown) are supported by the tank 3 to remove all of the ink from both surfaces of the disc 1 other than the ink within each of the holes 2. An air jet 5 (Fig. 2) is disposed on one side of the disc 1 opposite to the side on which a platen 6 is positioned. The platen 6 has a sheet 7 of paper on which droplets of ink are to be printed to form characters. As shown in Fig. 4, the air jet 5 pushes the meniscus ink film 4 of ink from the hole 2 until it is free therefrom, as shown in Fig. 5, to form an ink droplet
8. The ink is preferably a liquid magnetic ink so that a magnet 9 creates a magnetic field to attract the droplets 8 to impart directed flight to the print area of the sheet 7 of paper. Prior to reaching the sheet 7 of paper, the droplet 8 has a static charge placed thereon for deflection to a desired spot...