| 摘要 |
1,048,877. Roll film cameras. AGFA A. G. March 4, 1964 [Oct. 1, 1963 ], No. 9096/64. Heading G2A. The film 5 in a roll film camera is transported from a spool-less supply cartridge 3 to a spool-less take-up cartridge 4 by means of a sprocket 21, driven by means not shown and engaging in the film perforations. To the back cover 2 is fixed a latching spring 6 having a hooked end 7, this end being normally held clear of the film by the takeup cartridge itself. If, however, cartridge 4 has not been inserted into the camera, or not inserted properly, the end 7 of spring 6 is positioned in the film path, and so prevents further film advance. A lever 18, having two arms 18a, 18b, is biased by a spring 19 so that, when no take-up cartridge is present, a marker lug 20 on arm 18b is positioned between the lenses 16, 17 of the viewfinder. Thus when lug 20 is visible in the viewfinder, it is a warning that the take-up cartridge has not been inserted. When the cartridge has been properly inserted, it bears against arm 18a, so pivoting lug 20 out of the viewfinder field. Fig. 2 (not shown) is a modification in which the lever 18 itself has an extension which blocks the film advance path when cartridge 4 is not present. |
