Method and apparatus for making stencil screens for printing

Claim 1

IN APPARATUS FOR MAKING SCREEN STENCILS FOR PRINTING, THE COMBINATION COMPRISING A SUPPORT FOR A PLATE MADE FROM MATERIAL WHICH TRANSMITS LIGHT RAYS SUBSTANTIALLY FREE FROM DISTORTION, SAID PLATE HAVING DESIGN MATTER TO BE PRINTED ON ONE SIDE THEREOF, SAID SUPPORT HOLDING SAID PLATE IN POSITION TO PERMIT PASSAGE OF LIGHT THROUGH THE ONE SIDE BEARING THE DESIGN MATTER TO BE PRINTED, A FRAME, A SCREEN CARRIED BY THE FRAME, SAID SCREEN HAVING AN EMULSION COATING FOR FORMING UPON EXPOSURE TO LIGHT, A STENCIL ON THE SCREEN, MEANS FOR HEATING SAID SCREEN AND CAUSING IT TO EXPAND, MEANS TO SUPPORT SAID FRAME SO AS TO POSITION THE EMULSION COATED SCREEN GENERALLY PARALLEL TO BUT SPACED FROM THE LIGHT TRANSMITTING PLATE, AND MEANS TO APPLY PRESSURE AGAINST A PORTION OF THE SCREEN TO MOVE THAT PORTION FROM ITS POSITION ON THE FRAME AND PRESS IT INTO A POSITION PARALLEL TO AND IN CONTACT WITH THE PLATE.