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Ink Jet Copier with Photoconductor Deflector

IP.com Disclosure Number: IPCOM000087284D
Original Publication Date: 1977-Jan-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Queener, CA: AUTHOR

Abstract

An electrostatic image of an original 1 is formed on a rotating photoconductor (PC) drum 3 precharged by corona 2. Simultaneously, a paper sheet is fed from supply 4 and wrapped around paper drum 5. Both drums 3 and 5 are accelerated to the same peripheral velocity V. Ink drops 12, which leave nozzle(s) 7 with approximately the same speed V, are charged by electrodes 10 to the polarity of precharged PC drum 3. Flying drops 12 are either strongly repelled by the charged image areas of PC drum 3 and deflected onto the sheet on paper drum 5 or are weakly repelled by the uncharged background areas, thus reaching gutter 8. The "printing threshold" is adjustable by voltage 6, which biases paper drum 5. After printing, erase lamp 11 is turned on to remove the charge on PC drum 3, and the copy is fed to exit pocket 9.

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Ink Jet Copier with Photoconductor Deflector

An electrostatic image of an original 1 is formed on a rotating photoconductor (PC) drum 3 precharged by corona 2. Simultaneously, a paper sheet is fed from supply 4 and wrapped around paper drum 5. Both drums 3 and 5 are accelerated to the same peripheral velocity V. Ink drops 12, which leave nozzle(s) 7 with approximately the same speed V, are charged by electrodes 10 to the polarity of precharged PC drum 3. Flying drops 12 are either strongly repelled by the charged image areas of PC drum 3 and deflected onto the sheet on paper drum 5 or are weakly repelled by the uncharged background areas, thus reaching gutter 8. The "printing threshold" is adjustable by voltage 6, which biases paper drum 5. After printing, erase lamp 11 is turned on to remove the charge on PC drum 3, and the copy is fed to exit pocket 9.

Alternatively, ink drops 12 can be charged selectively by the image on the photoconductor drum 3 to the opposite polarity by positioning the break-off point of ink jet nozzles(s) 7 in proximity to the charged image. Charge electrodes 10 are then not necessary. After charging drops 12, the image on the PC drum 3 has to be erased. If a (semi)transparent photoconductor and PC drum 3 are used, an erase lamp 13 with focusing means 14 can be located inside the PC drum 3, focused onto the photoconductor in the nip region. Highly charged drops 12 are attracted by oppositely biased paper drum 5 striking the sheet. Drops 1...