Hoechst Aktiengesellschaft

Jurgen Neumann

Peter Gumm

Reinhold Arneth

Hartmut Schmidt

Disclosed is a device for indicating that the level of a dosable material has fallen below a predetermined level in a dosing container having a shaft mounted horizontally for rotation inside of the container and a dosing brush mounted on the shaft. This device comprises an elastic contact tongue radially fixed to the shaft for rotation therewith, the contact tongue being sufficiently elastic so that it assumes a bent configuration having a first radius when rotated in contact over a predetermined portion of its length with the dosable material and so that it assumes an extended configuration having a second radius when rotated so that it is not in contact over the predetermined portion of its length with the dosable material; a contact pin mounted at a distance from the shaft greater than the first radius but not greater than the second radius, so as to be contacted by the contact tongue in its extended configuration; and means for producing a signal when the contact tongue contacts the contact pin.

Level indicating device

A bearing plate for a moving band of photo-conductive recording medium, wherein the band is provided with perforations close to and parallel to one of its two longitudinal edges and is adapted to be contacted by a metal brush pressing against the recording medium in the zone of the perforated longitudinal edge. The bearing plate is formed from a base plate of a conductive material having an aperture therethrough and an electrically conductive grid covering the aperture.

Bearing plate for a band of photoconductive recording medium

Disclosed is a device for mixing and/or conveying, in particular for mixing and conveying a developer composition in an electrophotographic copying machine. The device comprises an elongated member which is rotatable about its longitudinal axis, this member comprising a T-shaped lateral cross-section which has been spirally twisted about its longitudinal axis, whereby at least two portions of the T cross-section comprise helically extending mixing and/or conveying elements. Also disclosed is a method for manufacturing such a device.

Spiral mixing element

Disclosed is a process and apparatus for separating aspherical particles from spherical particles in an admixture thereof, preferably in the preparation of a particulate carrier material for two-component developer systems for electrostatic copy devices. The process comprises directing the mixture of particles onto a surface which is inclined with respect to the horizontal; producing a relative velocity between the inclined surface and the mixture of particles, the velocity having a directional component transverse to the steepest inclination gradient of the inclined surface; and collecting a portion of the mixture of particles in a zone of the inclined surface wherein predominantly spherical particles have accummulated as a result of their greater tendency to roll in response to the relative velocity than the aspherical particles.

Growing community of inventors

Liederbach, Germany

Jurgen Neumann