| 摘要 |
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 DEG to about 160 DEG 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.
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