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494 MOTION PICTURE HANDBOOK
first try injecting a drop of heavy oil in the oil hole on top of part 624, P. 2. The clutch shoes, 625, P. 8, act by centrifugal force, which throws out weights 626, P. 8, against the action of springs 741, P. 8, thus forcing friction shoes 625 against track "Y," P. 8. The friction thus engendered revolves casing 624 in clockwise direction, thus forcing lever 627, P. 7, ahead and raising shutter flap 697, P. 1. Don't use thin oil on the automatic shutter governor, as it tends to reduce the friction too much. Use heavy oil and use it sparingly. Should the fire shutter raise too quickly, or should the governor develop undue friction, thus making the mechanism pull hard, it will probably be found that springs 741, P. 8, have become weakened. This may be remedied by installing new springs, or stretching the old ones. Another possible cause of failure of the fire shutter to act, or to act too slowly, is the binding of the screws at the top or lower end of link 628, P. 7. This link must swing perfectly free. In the center and top of fire shutter flap 697, P. 1, is a pin. This pin not only serves to hold the flap to its spindle, and prevent its slipping circumferentially, but it also prevents the shutter from raising too high. Therefore, it should not be allowed to become loose 'and fall out Automatic shutter governor counterweight 629, P. 2, should be kept set in such manner that it stands about half-way between the horizontal and perpendicular, when the shutter flap is down, leaning outward toward the lamphouse.
No. 7. Removing Top Roller Bracket.— Top roller bracket 612, P. 2 and 7, may be removed by taking out stud 720, P. 7.
No. 8. Removing Top Sprocket Idler.— Top sprocket idler 609, P. 2, may be removed by loosening screw 721, P. 2, pulling the shaft out and taking off the collar next the roller. These rollers should be renewed if there is any indication of flat spots on their surface.
No. 9. Removing Top and Bottom Sprockets.— Top sprocket 617, P. 7, and lower sprocket 646, P. 2, may be removed simply by loosening the set screw in the center of their hub, pulling the sprocket off the shaft. (See General Instructions Nos. 3 and 4.)
In the later machines there is a metal guard which comes up between the flanges of the upper sprocket. In order to remove this sprocket it will be necessary first to take off this guard, which may be accomplished by the removal of two screws, one in either of its lower corners.
No. 10. Tension of Upper Idler Bracket. — Upper sprocket idler 609, P. 2, is held to the sprocket by flat spring 615, P. 2.