| 摘要 |
A film font cassette for optically projecting, selectively, film font images for use in phototypographic composition equipment is described. A film strip having type character images printed in fonts of the type is rollably supported between a pair of reels within each side of the cassette and moveable past a central projection window. The reels include gear means at the bottom of the cassette interengageable with reel-turning mechanism in the equipment with which the cassette is to be used for selectively moving a film image into projecting position within the cassette projection window. Guide mechanism within the cassette and cooperative with indexing means on the equipment with which the cassette is to be used effects precise registration of the film and its image to be projected with the optical system of the equipment.
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