Browse Prior Art Database

Toner Concentration Sensor

IP.com Disclosure Number: IPCOM000074493D
Original Publication Date: 1971-May-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Khoury, RW: AUTHOR [+2]

Abstract

This system involves the measurement of the flow rate of developer through a limiting orifice in order to transduce toner concentrations and develop an electrical control signal. The device includes a limiting orifice 1, constricted tube, or capillary, and a flow rate sensor 2 (a meter capable of detecting small variations in rate of flow of developer), in order to provide a signal that can be used to control the rate of toner replenishment.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 86% of the total text.

Page 1 of 2

Toner Concentration Sensor

This system involves the measurement of the flow rate of developer through a limiting orifice in order to transduce toner concentrations and develop an electrical control signal. The device includes a limiting orifice 1, constricted tube, or capillary, and a flow rate sensor 2 (a meter capable of detecting small variations in rate of flow of developer), in order to provide a signal that can be used to control the rate of toner replenishment.

A limiting orifice having an internal diameter of 8 to 10 times the average diameter of the carrier particles within a developer mix has been found to be a suitable size. This diameter (0.080'') results in the maximum retardation of flow while still maintaining a continuous flow. In order for the flow rate to be related to toner concentration, the intake of developer into the limiting orifice is arranged so that a reasonably constant force is applied to developer particles about to enter limiting orifice 1. A funnel arrangement, as shown at A, performs well in providing flow rates that are a function of toner concentration.

A typical funnel configuration is shown at B. Other designs are possible such as a bin with an overflow to provide a constant level of developer within the bin, and the walls of the bin angled to establish gravity feed of developer into the limiting orifice.

A flow rate sensor capable of detecting flow rate differences between toner levels of 0.5, 0.9, and 1.3% is typical. In one...