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PRINTING MOTION PICTURE FILM
Fig. 68.— The Bell & Howell fully automatic printer.
used to maintain good contact between the films when they are in the exposing gate, thereby avoiding the possibility of scratching due to spring-loaded tension shoes, etc.
As arranged in the figure the unexposed roll of positive film is mounted at position 'P/ and, after the complete printing process has been carried out, the exposed positive is wound up at position T2\ In passing from the supply spool the positive film travels through a compressed air cleaner '£>', via a guide roller *C and under a driving sprocket *A\ It is then held under tension by two rollers *B', one on each side of the sound printing gate 'SG' and brought to the correct position, to ensure adequate wrap at the printing point, by two fixed rollers 'C, one on each side of this gate. After leaving the sound gate and passing rollers 'C\ 'B', sprocket 4 A' and roller 'C, the positive film is guided through the 'Line Gate', indicated at 'LG', where a black marginal line is printed on either side of the sound track. From this point the positive film passes through a further series of sprockets and rollers, precisely similar to those at the sound gate, but mounted to guide the film smoothly through the picture printing gate ?G'. Before final winding up the film passes through a second pair of compressed air cleaners 'D' and then to the take-up spool 'P2\
The sound negative is shown in the figure to be passing from 'SN/ to *SN2' and is first led through a cleaner 'D\ over a fixed