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Printed Circuit Writing Head for Electrochemical Printer

IP.com Disclosure Number: IPCOM000077487D
Original Publication Date: 1972-Aug-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Barrington, H: AUTHOR [+3]

Abstract

An electrochemical multiple stylus writing head 14 prints upon a chemically-treated, moistened paper 7, (Fig. 1,) by electrochemically dissolving metal onto paper 7. Apex 6 of head 14 contacts paper 7 resting on reference electrode 8. In Fig. 2, head 14 has metallic electrode lines 2 etched on metal clad flexible MYLAR* sheet 3. Sheet 3 is preformed on plastic base 1 and is secured to it by screws 4 in the shape shown, with protruding styli 10 formed by lines 2. A gap 5 between sheet 3 and base 1 provides resilience or spring action to sheet 3 and styli 10. If base lines 2 are not silver, deposit of a thick adhesive coating of electroplated silver to lines 2 is needed to supply silver for writing: Connections from head 14 to controls are provided by lines 9. Marking is provided in Fig.

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Printed Circuit Writing Head for Electrochemical Printer

An electrochemical multiple stylus writing head 14 prints upon a chemically- treated, moistened paper 7, (Fig. 1,) by electrochemically dissolving metal onto paper 7. Apex 6 of head 14 contacts paper 7 resting on reference electrode 8. In Fig. 2, head 14 has metallic electrode lines 2 etched on metal clad flexible MYLAR* sheet 3. Sheet 3 is preformed on plastic base 1 and is secured to it by screws 4 in the shape shown, with protruding styli 10 formed by lines 2. A gap 5 between sheet 3 and base 1 provides resilience or spring action to sheet 3 and styli 10. If base lines 2 are not silver, deposit of a thick adhesive coating of electroplated silver to lines 2 is needed to supply silver for writing: Connections from head 14 to controls are provided by lines 9. Marking is provided in Fig. 1 when a stylus 10 is positive relative to electrode 8, to transfer silver from stylus 10 at apex 6 of head 14 to paper 7. Head 14 can move along a paper to produce lines of printed data. Any combination of electrode size and spacing is produced by printed-circuit techniques to obtain the size character wanted. Variations in paper thickness are compensated for by resilient head 14. Scratching of paper is eliminated, since no sharp points are included on styli 10.

In Fig. 3, as silver is depleted from the styli 20 of a head 24, a fresh set of styli 20 is indexed into writing position. A ribbon 11 of printed-circuit electrodes...