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Full Page Printhead that Replenishes Worn or Eroded Styli

IP.com Disclosure Number: IPCOM000045362D
Original Publication Date: 1983-Mar-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Giordano, FP: AUTHOR [+3]

Abstract

This article describes an improved printhead for non-impact printing applications. One of the problems with some non-impact printing technologies, such as matrix and electroerosion printing, is the fast wear rate of the styli. This article describes a full-page printhead that can feed new styli to the print plane when needed.

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Full Page Printhead that Replenishes Worn or Eroded Styli

This article describes an improved printhead for non-impact printing applications. One of the problems with some non-impact printing technologies, such as matrix and electroerosion printing, is the fast wear rate of the styli. This article describes a full-page printhead that can feed new styli to the print plane when needed.

The head consists of a drum 10, as shown in Fig. 1, with holes 12 around the circumference in the shape of a single helix, a center shaft 14 with holes 16 in the same helix pattern, and a ratchet mechanism 18. Wires 20 are fed through the holes 12 in the drum into the holes 16 in the center shaft 14. The center shaft 14 has ratchet mechanism 18 attached such that during winding of the wires, ratchet 18 is in the released position. The center shaft 14 and its clearance holes 12 in the drum 10 form a spool for the individual styli wires 20 to be wound. Once wound, the wires 20 can be incrementally fed by the ratchet mechanism 18 to the surface of the drum and held there by the ratchet action. The wires 20 now can be cut to the correct length protruding above the drum surface. As the wires 20 wear down, the rachet 18 is incremented, pushing the wires 20 outwards whereby a grinding stone 22 can polish all wires to the same length, as shown in Fig. 2. This feature takes into account that all wires are used at a different rate and maintains that intimate contact between paper 24 and styli 2...