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170 Opinion on Reissue 12,037.
tinuously held by the interlocking of a sprocket and a hole. As one sprocket leaves a hole, the next succeeding sprocket enters the next succeeding hole. Irrespective entirely of any action of the take-up reel, the film must advance as the sprocket wheel moves, and cannot advance when the sprocket wheel is at rest. Complainant's expert has operated a camera constructed in substantial accordance with the specifications, and from which lie had removed the take-up reel. He found that the sprocket wheels alone moved the intermediate section of film across the camera at the requisite high rate of speed and with the intermittent motion.
In the defendant's biograph camera there are the usual reels and devices for giving to some parts of the apparatus a continuous and to others an intermittent motion. The "intermediate section'1 of film is moved across the lens by two friction rollers located just beyond the film guide. These move continuously, and draw the film forward. The mechanism for holding the same stationary during the exposure is stipulated in the record. "Mounted upon the motor shaft, N, is a grooved cam n imparting movement to an arm, n1, [which arm rocks a shaft, n2]. * * * Loosely mounted upon the journal, n2 [of the rock shaft], is a tension leaf, W, forming part of the film slide [or film guide], F. The film B, passes between this tension leaf and the back plate, f, of the guide * * * n5 designates a projection mounted upon the rock shaft n2, and co-acting with the tension leaf, W, to throw the same away from the back plate and therefore out of engagement with the film when a portion of the film has been exposed and it is desired to again move the film relatively to the lens. The rolls, which draw the film, rotate constantly, and would feed the film past the lens with a continuous motion were it not that the film is gripped by the tension leaf momentarily to admit exposure."
Figure 5 of the drawings of defendant's biograph machine will facilitate the understanding of this description.