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Browse Prior Art Database

AUTOMATIC DEVELOPMENT CONTROL

IP.com Disclosure Number: IPCOM000024237D
Original Publication Date: 1980-Feb-29
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 75K

Publishing Venue

Xerox Disclosure Journal

Abstract

This disclosure relates to a developer flow meter for use in controlling the operation of an automatic development control (ADC). Illustrated in the drawing are an ADC 10 and a flow meter 12. The ADC comprises a pair of parallel plates 14 and 16, the latter of which is adapted to have a voltage applied thereto through a voltage switching circuit schematically represented by reference numeral 18. The plate or electrode 16 comprises a window area in which toner is either deposited on or scavenged from depending on the polarity of the voltage applied to the electrode.

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(EROX DISCLOSURE JOURNAL

AUTOMATIC DEVELOPMENT CONTROL
118/691 C1. U.S. Proposed R. V. LaDonna Classification
P. K. Watson Int. Cl. B05c 11/00

This disclosure relates to a developer flow meter for use in controlling the operation of an automatic development control (ADC). Illustrated in the drawing are an ADC 10 and a flow meter 12. The ADC comprises a pair of parallel plates 14 and 16, the latter of which is adapted to have a voltage applied thereto through a voltage switching circuit schematically represented by reference numeral 18. The plate or electrode 16 comprises a window area in which toner is either deposited on or scavenged from depending on the polarity of the voltage applied to the electrode.

The flow meter 12 comprises a tubular member having a funnel-shaped upper end and a holding coil 22 disposed around the tubular member adapted when energized to hold the toner therein. During energization of the holding coil, a positive voltage is applied to the substrate of electrode 16 and toner is deposited in the window area. A pair of mutual inductance coils 24 and 26 are used to measure the volume of developer retained in the tubular member. When the developer level in the member 20 reaches the level of the coils, a change in mutual inductance takes place which causes the output from a comparator 28 to increase, which triggers a

Volume 5 Number 1 January/February 1980 17

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AUTOMATIC DEVELOPM...