Browse Prior Art Database

Xerographic Developer Nip Pressure Measurement

IP.com Disclosure Number: IPCOM000048314D
Original Publication Date: 1982-Jan-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Bernardelli, WJ: AUTHOR [+5]

Abstract

A pressure transducer is mounted behind a copier's photoconductor, and operates to dynamically measure the developer mix to photoconductor pressure as the adjacent portion of the photoconductor moves through the developer nip of a magnetic brush developer.

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Xerographic Developer Nip Pressure Measurement

A pressure transducer is mounted behind a copier's photoconductor, and operates to dynamically measure the developer mix to photoconductor pressure as the adjacent portion of the photoconductor moves through the developer nip of a magnetic brush developer.

In Fig. 1, drum 10 supports photoconductor film 11. The drum rotates so as to move the photoconductor through the various stations of a xerographic copier, including magnetic brush developer station 12. A pressure sensing transducer 13 is mounted within the drum, such that its movable pressure-sensing head 14 is aligned with a radius of the drum. Thus, transducer 13 reacts only to forces which are normal to the drum's tangent. The transducer's mounting hardware is nonmagnetic, and thereby interference with the developer's magnetic field is prevented as the transducer passes through the development nip. The dimensions of head 14, immediately adjacent the photoconductor, are one inch by one-tenth inch, the one inch dimension being measured along the drum's axis.

Electrical connections are made to the transducer by way of slip rings (not shown) carried by the drum.

With this construction, developer 12 experiences the same photoconductor environment at all times, and the transducer produces a dynamic pressure output profile which is a function of photoconductor movement. Preferably, a number of these transducers are spaced down the axial length of the drum and simultan...