Developer apparatus for heat developing paper

Claim 2

Apparatus for quickly and uniformly heating an exposed heat developing type paper comprising: a curved platen comprised of a single layer of resistive material, adapted to engage on the convex side thereof the heat developing paper, moving means held snugly against the convex surface of said platen layer, and movable relative to said layer, means for driving said moving means relative to said layer, guide means for receiving the paper and guiding the paper between said moving means and said platen layer to cause the paper to move over said platen layer as said moving means is driven over said platen layer, electrical power means connected to said platen layer for causing current to flow through said layer of resistive material and correspondingly heat said layer, means to sense the temperature of said platen layer and correspondingly control the power of said platen layer to maintain said platen layer at a predetermined temperature, means for causing said moving means to be agitated relative said paper, as said moving means is moving said paper over said platen layer thereby minimizing the moving means surface configuration from being imprinted on said paper.

Claim 3

Apparatus of claim 1 with said electrical power means comprising a transformer having a primary winding of many turns and having a secondary winding of less than six turns, said platen layer being in said secondary winding of less than six turns.

Claim 4

The apparatus of claim 1 with said electrical power source comprising a transformer core, a primary winding of many turns being on said transformer core and being connected to said power source, said platen means being in the secondary winding of said transformer core and having substantially fewer windings than said primary winding.

Claim 5

Apparatus of claim 1 with said platen means having notches cut along its periphery to form a plurality of spaced legs along the periphery and to concentrate current flow in the legs thereby raising the temperature in the legs to insure more uniform temperature of the platen means.

Claim 6

The apparatus of claim 1 with said means for moving the heat responsive member comprising belt means which is driven over said platen surface, roller means around which said belt means is placed being positioned to hold said belt means in intimate contact with said platen surface, said roller means being mounted for eccentric rotation to cause said belt means to have a reciprocal movement relative said heat-responsive member as said belt means is moving over said platen surface.

Claim 7

Apparatus in claim 1 with means for moving the paper over said platen surface as the paper is being developed to provide an average heat to said paper to insure uniform heating of said paper, said platen surface being polished to facilitate movement of the paper over the surface, improve heat transfer to the paper from the surface and improve heating uniformity of the paper.

Claim 8

Apparatus for quickly and uniformly heating an exposed heat developing type paper comprising: a curved platen comprised of a single layer oF resistive material adapted to engage on a convex side thereof the heat developing paper, moving means held snugly against the convex surface of said platen layer, and movable relative to said layer, means for driving for said moving means relative to said layer, guide means for receiving the paper and guiding the paper between said moving means and said platen layer to cause the paper to move over said platen layer as said moving means is driven over said platen layer, electrical power means connected to said platen layer for causing current to flow through said layer of resistive material and correspondingly heat said layer, means to sense the temperature of said platen layer and correspondingly control the power to said platen layer to maintain said platen layer at a predetermined temperature, a plurality of spaced legs being along a periphery of said platen means with said legs being between said electrical power means and said platen layer so that the current flowing through said platen layer flows through said legs causing a higher current density in said legs thereby raising the temperature in the legs to assure more uniform temperature in the remainder of the platen layer.

Claim 9

Apparatus for quickly and uniformly heating an exposed heat developing type paper comprising: a curved platen comprised of a single layer oF resistive material adapted to engage on a convex side thereof the heat developing paper, moving means held snugly against the convex surface of said platen layer, and movable relative to said layer, means for driving for said moving means relative to said layer, guide means for receiving the paper and guiding the paper between said moving means and said platen layer to cause the paper to move over said platen layer as said moving means is driven over said platen layer, electrical power means connected to said platen layer for causing current to flow through said layer of resistive material and correspondingly heat said layer, means to sense the temperature of said platen layer and correspondingly control the power to said platen layer to maintain said platen layer at a predetermined temperature, a plurality of spaced legs being along a periphery of said platen means with said legs being between said electrical power means and said platen layer so that the current flowing through said platen layer flows through said legs causing a higher current density in said legs thereby raising the temperature in the legs to assure more uniform temperature in the remainder of the platen layer.