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Browse Prior Art Database

Printer Recorder

IP.com Disclosure Number: IPCOM000073927D
Original Publication Date: 1971-Feb-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Magill, PJ: AUTHOR [+3]

Abstract

High-speed printing is accomplished by utilizing a "fluidic"-type print head to eject ink in a continuous or discrete manner. In Figure A, paper issuing from a supply roll 2 passes under a linear array 3 of these print heads and subsequently through a drying chamber. The write head is controlled to eject fluid (ink) only when printing is desired, the control for which is achieved as follows: Referring to Figure B, writing fluid from a pressurized reservoir 2 enters the head via a port 6. By virtue of fluid flow (ink or gas) from control jet 7, the ink is diverted to channel 8 and returned to a sump. When printing is desired, a control jet 9 admits a fluid (ink or gas) whose pressure is in excess of that controlled by jet 7 to direct the flow of ink into printing channel 10.

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Printer Recorder

High-speed printing is accomplished by utilizing a "fluidic"-type print head to eject ink in a continuous or discrete manner. In Figure A, paper issuing from a supply roll 2 passes under a linear array 3 of these print heads and subsequently through a drying chamber. The write head is controlled to eject fluid (ink) only when printing is desired, the control for which is achieved as follows: Referring to Figure B, writing fluid from a pressurized reservoir 2 enters the head via a port
6. By virtue of fluid flow (ink or gas) from control jet 7, the ink is diverted to channel 8 and returned to a sump. When printing is desired, a control jet 9 admits a fluid (ink or gas) whose pressure is in excess of that controlled by jet 7 to direct the flow of ink into printing channel 10. The control for discrete dot printing or continuous recording is accomplished by controlling the activation time of the control jet 9.

Alternatively, discrete printing may be accomplished with a print head within which air flow governs the ink ejection, as seen in Figure C. In this case, air from reservoir 11 enters the print head at 12. This air is diverted to channel 13 by control jet 14. In the process, a pressure differential is created between an ink reservoir 15 and channel 16, sufficient to draw an ink droplet through a capillary tube portion into channel 16. When the control jet 17 is activated to provide a fluid pressure in excess of that at jet 14, air flow is divert...