Developing apparatus for developing diazotype material according to the semi-dry process

Claim 1

A developing apparatus for developing diazotype material according to the semi-dry process comprising an applicator roll means having a liquid-adsorbing resilient cover thereon, a press roll means having a grooved hard surface, and a backing roll means, said applicator roll means and said press roll means having a plane of transport between them for the passage of diazotype material to be developed, means biasing said backing roll means against said press roll means, means whereby said press roll means may be displaced toward said applicator roll means, blade means for reducing the amount of developer liquid on said applicator roll means and said press roll means, and the axial moment of inertia J 2 of said press roll means relative to the axial moment of inertia J 3 of the applicator roll means being determined in accordance with the equation: ##EQU2## wherein: G 2y =the weight component of the press roll means, extending in a connecting plane of axes of the press roll means and the applicator roll means, normal to the axes, G 3y =the weight component of the applicator roll means, extending in the connecting plane of the axes of the press roll means and the applicator roll means, normal to the axes, P 1y =the contact pressure component of the backing roll, extending in the connecting plane of the axes of the press roll means and the applicator roll means, normal to the axes, and ΣP 4zy =the sum of the components of the tangential force and the normal force of the contact pressure of the blade means, and of the frictional force along the line of contact of the blade means on the applicator roll means, resulting from the normal force and the friction coefficient, which extend in the connecting plane of the axes of the press roll means and the applicator roll means, normal to the axes.