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556 MOTION PICTURE HANDBOOK
No. 35. — To remove gate 80P, P. 1, take out the four screws holding the main casting to the posts and then pull the gate away. The hinges are held by dowel pins in addition to the screw.
No. 36. — Automatic fire shutter flap 91 P, P. 2, is attached to its shaft merely by being bent around it. Its position on the shaft may be adjusted by holding horizontal rack 88P, P. 1, stationary and lifting or lowering, as the case may be, fire flap 91P, P. 2. Fire flap 91 P, 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 machine. This rack should be kept clean and perfectly free at all times, since the shutter drops by gravity alone.
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 operator 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.
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 tfi 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