Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Piezoelectric Toner Level Sensor Mount for Cyclone Precipitator Applications

IP.com Disclosure Number: IPCOM000109885D
Original Publication Date: 1992-Sep-01
Included in the Prior Art Database: 2005-Mar-24
Document File: 4 page(s) / 112K

Publishing Venue

IBM

Related People

Chaffin, DO: AUTHOR [+2]

Abstract

In electrophotographic printers and copiers, untransferred toner removed from the photoconductor is commonly carried away by entrainment in air. Toner is then separated from the air with a cyclone precipitator and deposited in a disposable container positioned beneath the precipitator. A piezoelectric sensor, mounted inside the container, is a simple, cost-effective means of sensing when the toner container is full. However, there is a set of problems associated with this application, and most reliable piezoelectric sensors, by virtue of their packaging requirements and conventional mounting schemes, are particularly prone to exhibit these problems.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Piezoelectric Toner Level Sensor Mount for Cyclone Precipitator Applications

       In electrophotographic printers and copiers,
untransferred toner removed from the photoconductor is commonly
carried away by entrainment in air.  Toner is then separated from the
air with a cyclone precipitator and deposited in a disposable
container positioned beneath the precipitator.  A piezoelectric
sensor, mounted inside the container, is a simple, cost-effective
means of sensing when the toner container is full.  However, there is
a set of problems associated with this application, and most reliable
piezoelectric sensors, by virtue of their packaging requirements and
conventional mounting schemes, are particularly prone to exhibit
these problems.

      First, if the "stream" of toner exiting the bottom of the
cyclone precipitator is aimed at the sensor, that toner will collect
on the sensor surface and result in a false "container full"
indication.  With regard to this problem, it should be noted that the
direction of this toner "stream" varies from machine to machine, and
within a single machine as air flow varies over the machine's life.
This makes it difficult, if not impossible, to reliably position the
sensor so as to avoid the problem.

      Secondly, in the case where the toner "stream" is not aimed at
the sensor, toner dust airborne in residual air currents that exist
in the container will tend to collect on the sensor and result in a
false "container full" indication.

      Thirdly, there is a tendency for toner to remain "caked" on the
sensor surface after the full container has been replaced with an
empty container, resulting in a false "container full" indication.

      Since it is not acceptable for the machine to run with the
toner container full, indication of such is d...