International projectionist (Jan 1963-June 1965)

ing the Drive-In Projection Ready for Spring These hints nun serve as a guide in getting \<>ur projection and sound equipment ready for spring: Place <>ne or two drops projector oil in each idler oil hole, and look the soundheads over carefully so as not to miss an\ oil hole or oil cup. The valve rollers of the upper and lower magazines do not require luhiication. 5. MAGAZINE REEL SPINDLE? Plare several drops of projector oil in the oil hole of each magazine spindle shaft. Avoid spilling oil into the friction-disc clutch of Simplextype lower magazine takeups. i ["he cork discs of Motiograph takeups nia\ be Boaked in oil when disassembled, but this is the single exception to the rule of "no oil in takeup friction clutches.'" i C. ADJUSTMENTS 1. UPPER MAGAZINES Make sure that the upper magazine is in correct alignment with the valve rollers and mechanism sprockets so as to avoid twisting, scraping, ": shearing the film. Spindle tension should exert sufficient "drag" to prevent a fully loaded 2000-ft. reel from spinning too freely. 2. LOWER MAGAZINES Replace takeup belt if loose, worn, or oil-saturated. I Loose or oily belN slip and cause the film to take up in an irregular manner. I It is often advisable to disassemble the takeups completelv and wash the parts in lighter fluid or cleaning naphtha to remove oil and dirt from the friction disc and clutch slipping surfaces, but this chore takes time and may be deferred if the takeups appear to be ir good working condition. Adjust tension so that a fully loaded 2000-ft. reel in the lower magazine will start turning of its own accord when the projector is switched on. but not so much tension thai the reel cannot easily be held back from turning with light pressure cf the finger. 3. FIRE V\LVE ROLLERS Check the rollers for free turning and absence of "flats" which scratch the picture and soundtrack areas of the film. Worn rollers should be replaced without delay! 4. AUTOM \TIC FIRE SHUTTER Turn the projector motor on. and after the machine has attained normal running speed, turn it off. meanwhile observing the lifting and dropping action of the fire shutter behind the film aperture. The shutter should drop before the machine has come to a stop. Remove obstructions which interfere with it action, and make sure that the centrifugal governor which controls its action is free from dirt and in good condition. 5. TRANSMISSION. MECH VNISM, \M) SOUND HEAD GEARS (".heck all gears and replace those having chipped or otherwise damaged teeth. Check all gear trains for c\cc--ive backlash, especially the shutter-driving gears. A small amount of backlash is normally present in a projector, but excessive backlash in the shutter gears is troublesome and requires extra blade width to avoid travel ghosts. This wastes light. Replace gears having worn teeth. Racklash in the main gear train can be reduced by replacing the gear shafts with oversize shafts made especially for old machines with worn bearings. 6. FILM SPROCKETS AND IDLERS Examine all sprockets in mechanisms and soundheads for worn and undercut teeth. Undercutting is detected by noticing whether a knifeblade "clicks' when passed lightly over the film-contacting face of a tooth from base to tip. Reverse or replace worn sprockets, deferring the changing of sprockets on oldstyle intermittents until the movements are overhauled. L ine up idlers laterally, if necessary, and adjust each for a space of 2 thicknesses of film between idler and sprocket faces. {Continued) PROJECTOR CARBONS Better Light! Lower Costs! RINGSOORFF CARBON CORP. East McKcesport. Pa Projectionists who like quality always use the best itar Film Cement Sold by Supply Dealers Send for FREE Sample ACE CHEMICAL CO. ■ (Division of the Ac* Electric Mfg. Co.) 1923 Bay Road Miami Beach, Florida ASHCRAFT CORE-LITE SUPER CINEX CINEX SPECIAL PROJECTION LAMPS And HIGH REACTANCE MULTI-PHASE RECTIFIERS World's Standard of Projection Excellence International Projectionist January, 1965 11