Browse Prior Art Database

Developer Anti Dusting Curtain

IP.com Disclosure Number: IPCOM000088372D
Original Publication Date: 1977-Jun-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Caudill, AH: AUTHOR

Abstract

This is a curtain that confines toner dust to the developer in an electrophotographic copier machine. Specifically, the curtain attempts to close off air paths which may be present between the interior of the machine and the interior of the developer, where the developer housing opens to a rotary drum carrying photoreceptive material.

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Developer Anti Dusting Curtain

This is a curtain that confines toner dust to the developer in an electrophotographic copier machine. Specifically, the curtain attempts to close off air paths which may be present between the interior of the machine and the interior of the developer, where the developer housing opens to a rotary drum carrying photoreceptive material.

Fig. 1 shows a sectional side view of developer 10 with magnetic brush roll 11 which carries steel beads coated with toner into contact with photoreceptive material on drum 12. The developer mix (carrier beads plus toner) is picked up by roll 11 and doctored to a fixed thickness by lower doctor blade 13, and is smoothed again by a top doctor blade 14. If the top doctor blade 14 is not in contact with the developer mix at some point along the roll length, an air path for the escape of toner dust is presented. To close off such a path, anti-dusting curtain 15 is positioned as shown in Fig. 1. Curtain material may be a 0.01 inch thick urethane sheet or any other material with the required flexibility and toughness.

Where the cleaning station is not greater in length than roll 11 but only extends to the edge of the image, any dust escaping at the ends of the roll 11 onto drum 12 will build up on drum 12 and be communicated to the rest of the machine. To close off that path, curtain 15 is extended by ears 15a at the ends of roll 11, as shown in Fig. 2, and tucked into the developer under bottom seal 16 (Fig...