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484 MOTION PICTURE HANDBOOK
plishes the framing of the picture by bending the film inward over the top of the intermittent sprocket. Rollers 26131 (two of them), may be removed by loosening the small set screw in the base of the casting and pulling outward on the roller. Each roller is mounted on a short spindle and is entirely independent of its mate. Part 26130, P. 2, which carries these rollers, may be removed by loosening the set screw in its hub and pulling outward on the casting. In replacing this part, be sure and get the point of the set screw entered into the countersink in the shaft. Otherwise the arm will not set right and the framing of the film will not be properly accomplished. The removal of part 26130, P. 2, also releases the spindle carrying it and the roller on the opposite side which is connected with the top of link 26137, P. 3, and by connecting the top end of the link the spindle and arm may be pulled out. The framing lever itself can be removed from the cast lug to which it is attached or the lug and the lever may be detached by taking out 26144, P. 4.
No. 17.— Film gate 26109, P. 1, is operated by gate lever 26120, P. 4. The raising of this lever closes the gate and locks it. Conversely, the lowering of the lever unlocks the gate and releases the film. The gate, its top roller, lever and link are shown, together with the aperture plate in detail in P. 5. The film gate and its assembled parts, as shown in P. 5, may be released from the mechanism as a whole by taking out screw 26121, P. 3, the screw which fits into hole X, P. 5, and loosening the small set screw in the lugs holding the front end of the two rods upon which the gate slides and driving the rods out, using a hard wood punch from the back end.
No. 18.— The aperture plate 26095, P. 3 and 5, is released by taking off knurled knobs (two of them) 26103, P. 1 and 5. The aperture plate tracks (see General Instruction No. 11) consists of a thin strip of highly tempered spring steel (26100 right, 26101 left, P. 5), held down by two metal strips 26098, P. 5. These strips may be removed by the simple process of taking out the eight screws which hold strips 26098, P. 5, in place, whereupon new strips, secured from the Edison Company, can be put in by being clamped under the metal strips.
Tension bars 26110, P. 5 and 1, are of hardened tool steel and should wear indefinitely. They are held in place by two guide screws, one of which is shown at 26112, P. 3, and are supplied with tension by two bow-shaped flat springs, one at <:he top and one at the bottom, upon which the points of screws 26885 (two of them) bear, 7712, P. 3, being the lock