Browse Prior Art Database

Drop/On/Demand Ink Jet Printer

IP.com Disclosure Number: IPCOM000087512D
Original Publication Date: 1977-Feb-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Meier, JH: AUTHOR [+2]

Abstract

Greater packaging density of drop impellers is possible in drop-on-demand ink jet printers by using a fine rod to couple electromagnetic actuator motion with an elastic piston.

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Drop/On/Demand Ink Jet Printer

Greater packaging density of drop impellers is possible in drop-on-demand ink jet printers by using a fine rod to couple electromagnetic actuator motion with an elastic piston.

An electromagnetic actuator (Fig. 1) includes an actuating winding 1 on a bobbin 2 which supports permanent magnet 3. A soft magnet 4 on a rod 5 is supported in the bobbin core by a soft rubber bushing 6. Magnet 3 has a bumper 7 adjacent magnet 4. Upon energization of winding 1, soft magnet 4 is repelled a small amount from permanent magnet 3, thus moving rod 5. The periphery of support 6 does not move within the bobbin core.

In Fig. 2, the opposite end of rod 5 is coupled to a rubber piston 8 in chamber 9 of molded nozzle body 10. Ink is supplied to duct 11 below the piston by capillary action between a pair of plates 12 and 13 having inner nozzle 14 and outer nozzle 15, respectively. Actuation of the piston 8 causes compressive force on the ink in chamber 9 and duct 11 to eject a drop of ink from nozzle 15 toward the recording surface.

The described actuating arrangement permits compact packaging of a plurality of devices, as illustrated in Fig. 3. The small size of the rods 5 allows fan-in to the small, semi-circular nozzle body 10 containing the corresponding plurality of compression chambers and ducts. The chambers are located in a staggered, interspersed arrangement along the base.

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