Browse Prior Art Database

Electrostatic Printer

IP.com Disclosure Number: IPCOM000091600D
Original Publication Date: 1968-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Folwell, GA: AUTHOR [+2]

Abstract

Each write head 1 comprises a seven-by-nine pin electrode matrix. Each pin is connected to a respective two-way microswitch. A positive potential is applied to one pole of each microswitch and a negative potential to the other pole. By selectively setting the microswitches, an electrostatic charge pattern is formed on each head 1, consisting of a character pattern of positive potential on a background of negative potential. Every pin in heads 1 is at either a positive or a negative potential with respect to ground.

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Electrostatic Printer

Each write head 1 comprises a seven-by-nine pin electrode matrix. Each pin is connected to a respective two-way microswitch. A positive potential is applied to one pole of each microswitch and a negative potential to the other pole. By selectively setting the microswitches, an electrostatic charge pattern is formed on each head 1, consisting of a character pattern of positive potential on a background of negative potential. Every pin in heads 1 is at either a positive or a negative potential with respect to ground.

A latent electrostatic image of the charge patterns on heads 1 is recorded on the surface of nylon band 2. The latter is moved, in the direction indicated by a sprocketed drive roller 3 and passes over idler rollers 4 and 5. Over curved backing plate 6, band 2 assumes intimate contact with the backside of copy paper 7 which is fed at the same speed as ribbon 2 by tensioning roller 8.

Ionized ink mist, bearing a charge of the same polarity as that of the background charge on band 2, is caused to flow through guideway 9 at the same speed as that of paper 7. Ink is deposited on the front of paper 7 so that the charge pattern on band 2 is neutralized. Thus, the print density on paper 7 depends only on the charge density on band 2. After the ink image is formed on paper 7, the latent charge image on band 2 is erased by application of a potential of the same polarity as that of the background charge on band 2 to erase head
10. White-on-...