Chemistry: electrical and wave energy – Apparatus – Electrophoretic or electro-osmotic apparatus
Patent
1997-12-23
1999-07-27
Mayekar, Kishor
Chemistry: electrical and wave energy
Apparatus
Electrophoretic or electro-osmotic apparatus
101DIG29, 101DIG37, C25D 1300
Patent
active
059284862
ABSTRACT:
An image revealing squeegee device for an electrocoagulation printing apparatus including a positive cylindrical electrode having a central longitudinal axis and a passivated surface on which dots of colored, coagulated colloid representative of a desired image are formed by electrocoagulation of an electrolytically coagulable colloid present in a colloidal dispersion containing a coloring agent, the positive electrode having a predetermined radius and being rotatable about the longitudinal axis in a predetermined direction. The squeegee device of the invention comprises an elongated blade member of resilient material having two planar surfaces intersecting one another to define a rectilinear edge extending parallel to the longitudinal axis of the positive electrode and adapted to contact the surface thereof, one of the planar surfaces defining a colloid arresting surface for retaining upstream of the blade member excess colloidal dispersion carried by the positive electrode and containing non-coagulated colloid, the colloid arresting surface being inclined in a direction opposite to the direction of rotation of the electrode at an angle of about 100.degree. to about 160.degree. relative to the radius thereof, and means for holding the blade member in pressure contact engagement with the positive electrode. Upon rotation of the positive electrode, non-coagulated colloid contained in the dispersion is retained by the colloid arresting surface, thereby uncovering the dots of colored, coagulated colloid without adversely affecting the coagulated colloid.
REFERENCES:
patent: 4895629 (1990-01-01), Castegnier
patent: 5693206 (1997-12-01), Castegnier et al.
Castegnier Adrien
Davidson Normand
Gadbois Gilles
Laplante Christian
Elcorsy Technology Inc.
Mayekar Kishor
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