Motion Picture Herald (May-Jun 1943)

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May 29, 1943 BETTER THEATRES {Continued from page 76) amined by a magnifying glass, if convenient and a flashlight to check any "hooks" or wear at the root of the teeth on the side taking the hardest pull. Bad teeth on the sprockets will always tear out sprocket holes and mutilate film. Before each day's show check the intermittent sprocket for any play between the star and cam in each of the four positions, and to see if there is any end play. A "jump" of the picture on the screen can be caused by slack between the cross and cam, and a lateral movement is created by end play. All sprockets, idlers and pad rollers should be clean and polished bright, and they must rotate freely. FILM BREAKAGE Frequent film breakage can be caused by dirty sprockets. The collection of emulsion or dirt between the teeth of the sprockets should be constantly removed as this accumulation will cause the moving film to raise the idler rollers just high enough for the film holes to jump the sprocket teeth. This is the main cause of torn sprocket holes and ripping of film, as well as of occasional fires. Also improper threading of the film through the projector will tear film. Ripping out of the sprocket holes in the film is caused also by too much tension on the idlers. Check the sprocket teeth for wear ; when these are neglected the film will wear one side of the teeth, causing them to become hook-shaped. UNSTEADY PICTURE White streaks or a streaky picture on the screen is caused by dirt at the aperture plate, tension pads or shoes and fire valves, scratching the film. A "jumpy" picture on the screen can be caused by : Too great tension at the aperture gate will cause the intermittent sprocket to exert a terrific strain at the film sprocket holes. The projector may be vibrating due to unevenness of the floor or base. The loss of either the upper or lozver loop of film in the projector. The "over-shooting" of the film due to improper tension at the gate causing the film to stop too suddenly or too loose. Dirt or emulsion between the teeth of the sprockets. The projector running too fast. Poor patches and torn sprocket holes in the film. INTERMITTENT SPROCKET WEAR Undue wear on the intermittent sprocket or star-wheel can be caused by too great or too little tension on the pad or film guide. In this case the tension spring should be compressed or released until the proper tension is obtained on both sides of the shoe. A good tension spring exerts just enough pressure to hold the film against the tracks and stop it completely when the intermittent sprocket comes to a stop. A vertical "jump" or hazy picture on the screen is caused by weak or defective tension springs because of their inability to hold the film perfectly flat against the REC.U.S.PAT.OFF. y ABOVE ALL we want you to know we appreciate your patronage and hope to serve you better when our facilities are no longer needed to turn out precision parts for war. laVfezzi Machine Works 180 North Wacker Drive Chicago, Illinois