Browse Prior Art Database

Toner Level Sensing

IP.com Disclosure Number: IPCOM000052681D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 3 page(s) / 86K

Publishing Venue

IBM

Related People

Broadie, RW: AUTHOR [+3]

Abstract

As toner is cleaned from the photoconductor of a xerographic copier, th residual toner is collected in a trough and then transported to a collection bottle by operation of an auger. When the bottle fills, and the delivery end of the auger becomes packed with toner, the compaction of the toner physically moves a member which actuates a magnetic reed switch or a mechanical switch. This switch operation indicates that the copier should not be used until the toner collection bottle has been replaced.

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Toner Level Sensing

As toner is cleaned from the photoconductor of a xerographic copier, th residual toner is collected in a trough and then transported to a collection bottle by operation of an auger. When the bottle fills, and the delivery end of the auger becomes packed with toner, the compaction of the toner physically moves a member which actuates a magnetic reed switch or a mechanical switch. This switch operation indicates that the copier should not be used until the toner collection bottle has been replaced.

Fig. 1 is an end view of a photoconductor drum 10 having residual toner 11 remaining thereon after the copier's transfer station. This toner is cleaned from the photoconductor by operation of brush 12. Airborne toner precipitates onto electrically biased metal roller 13, and is then scraped from the roller by metal blade 15. This toner drops into trough 16, and is then transported to the back of the copier by auger 17.

As seen in Fig. 2, the delivery end of auger 17 terminates in the upper end of toner collection bottle 18. This end of the auger includes a housing 19 which supports a movable plunger 20 and magnet 21 at a position which is normally spaced from normally-closed reed switch 22. Plunger 20 is biased to the left by spring 25.

Toner gravity-drops down through opening 23 in housing 19 to begin filling the bottle.

If bottle 18 is not replaced, as it should be periodically during copier maintenance, the bottle eventually fills. Housing 19 then...