Image revealing squeegee device for an electrocoagulation printi

Chemistry: electrical and wave energy – Apparatus – Electrophoretic or electro-osmotic apparatus

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101DIG29, 101DIG37, C25D 1300

Patent

active

060902574

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 a device 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.

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