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774 HANDBOOK OF PROJECTION FOR
the case may be, fire flap 91P, P. 2. Fire flap 91P, P. 2, may be removed by driving out the spindle from the pinion end. In replacing hold the corner of a hardwood block against the pinion and drive the shaft into the pinion, after having shoved the shaft through the fire flap. The rack engaging this pinion may be removed by driving it through the gate away from the pinion; use only a hardwood punch for this purpose, the door of course being open or off the projector. This rack should be kept clean and perfectly free at all times, since the shutter drops by gravity alone.
INSTRUCTION NO. 37.— Each of tension shoes 65P, P. 1, is pivoted to a plunger which passes through the gate casting, the shoes being held up against the film by a flat spring, the lower end of which is seen at 66P, P. 1. The tension on this spring is regulated by nut 68P, P. 2, which is attached to a steel screw 67P, P. 1. Thus the projectionist at all times is able to give his tension the finest possible adjustment. Spring 66P, P. 1, is so pivoted that it automatically equalizes the tension between the two shoes.
Lower tension shoes 55P, P. 1, are attached to plate 58P, P. 1, and are held up by a small flat yoke spring at its rear. Plate 58P, P. 1, and lower tension shoes 55P, P. 1, may be removed by taking out screw 878P, P. 1, on the upper end of the plate. Upper tension shoes 65P, P. 1, may be removed by pressing in on the lower end of the shoe until the upper end comes out of its engaging slot ; turn upper end toward center of the gate. It will then be released from its pivot pin.
INSTRUCTION NO. 38.— Spring 94P, P. 1, is held by two screws at its lower end, and serves to hold the film over against the steel track at the left of the aperture. It also prevents side motion. The main tension spring supplies tension to the upper shoes. To remove this spring, remove screw 72P, P. 2, in the center of nut 68P, P. 2, taking off nut 68P, P. 2, and pulling out pin 67P, P. 1. In replacing the spring be sure that the depression in its face rests on the fulcrum properly and that its upper ends engage with the plungers of the tension shoes.
INSTRUCTION NO. 39.— Upper sprocket 452, P. 1, may
be removed by loosening the screw holding stripper spindle 454P, P. 1 and 3. Swing the stripper up out of the way, loosen the set screw in the hub of the sprocket, and pull sprocket off. In replacing sprocket be careful to get it properly centered between the flanges of its idler rollers.