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Browse Prior Art Database

Charge Scorotron

IP.com Disclosure Number: IPCOM000087285D
Original Publication Date: 1977-Jan-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Cozad, LH: AUTHOR

Abstract

In a scorotron used in a xerographic process to charge a photoconductor, it is necessary to accurately position the scorotron's grid wires relative to both the emitting corona wire and the photoconductor's surface. In addition, each grid wire must be spaced from the adjacent grid wire; however, this spacing is less critical.

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Charge Scorotron

In a scorotron used in a xerographic process to charge a photoconductor, it is necessary to accurately position the scorotron's grid wires relative to both the emitting corona wire and the photoconductor's surface. In addition, each grid wire must be spaced from the adjacent grid wire; however, this spacing is less critical.

This scorotron includes a plastic end block with two separate mechanical locating means to position the grid wires. The first means controls the grid position relative to the emitting corona wire. The second means controls the spacing of adjacent grid wires.

Fig. 1 is an exploded view of scorotron 10 and photoconductor drum 12. The means 13 for mounting the ends of the grid wires is shown in Fig. 2.

Each end of the scorotron includes a plastic end block 19, shown in partial section in Fig. 2. A number of emitting corona wires 14 are accurately positioned by rib 15, and pass through openings 16 as the wires extend to the opposite end block. The means of mounting the ends of wires 14 is not shown.

The spacing 17 between grid wires 11 and emitting wires 14 is accurately maintained by a continuous locating surface 18, formed as a shoulder in the end block. This locating surface does not operate to position the adjacent grid wires, one from the other. Adjacent positioning of the grid wires is achieved by a number of spaced, upstanding ribs 20. The notches formed by adjacent ribs 20 lie below surface 18. Thus the grid wires do not...