Plain film platform for projecting screen apparatus, X-ray picture apparatus or the like

X-ray imaging apparatus comprising:

• means for converting an x-ray image into a visible light image;
• means for projecting said image onto a photographing plane;
• film platform means for positioning a plane sheet film in said photographing plane;
• means for storing unexposed sheet film;
• means for storing exposed sheet film;
• means for transporting sheet film between said means for storing and said film platform means wherein said film platform means includes a vertically arranged platform member which is open above for automatic insertion and withdrawal of films and has two vertical sides and upper and lower horizontal sides;
• and a plurality of guiding strips for inserting and hold a film in direct contact with the film, said guiding strips including a first guiding strip which is fixed and extends along one vertical side of said platform member, a second lower guiding strip which is fixed and extends horizontally at said lower side of said lower side, and a third guiding strip arranged displaceably transversely to said second guiding strip and in the region between said first guiding strip and said second guiding strip in a direction parallel to said second guiding strip;
• and a fourth strip which is mirror-inverted relative to said first guiding strip and is arranged displaceably in a direction transversely relative to the latter, said fourth guiding strip extending vertically downward to said second guiding strip;
• and drive means for adjusting the positions of said third and fourth strips.