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MOTION PICTURE PROJECTION 553
REMOVING AND REPLACING INTERMITTENT SPROCKET
Should teeth on intermittent sprocket become worn, damaged, or under-cut, it is quite necessary that the worn sprocket be replaced with a new one. The replacing of the sprocket is an operation which is most simple, but it should only be attempted by one who is capable of exercising the utmost care, and equipped at least with the necessary tools. Preferably, the manufacturers of the Simplex would like users of Simplex equipment to have this change made either at the distributor's service station, or at the Simplex factory, but where either of these courses is impossible and a replacement is imperative, it must be understood that force and strength must not be applied in taking off or putting on the intermittent sprocket, depending rather upon patience and utmost care in accomplishing and completing a most satisfactory operation.
Remove the intermittent movement complete as described. Loosen two screws S-125-B, P.l and making sure that these screws are entirely loosened, grasp intermittent sprocket (guarding particularly against springing shaft) and pull straight out, in this way removing bushing, star, shaft, and sprocket in one unit from the casing. Now lay sprocket upon a "V" block, and very gently drive taper pins out of sprocket. This process should be most carefully performed in order that the shaft is in no way "sprung," for should the shaft be the least fraction "out of true," a steady picture on the screen is absolutely impossible to procure. When the pins are re