Moving Picture World (Jan-Mar 1912)

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384 THE MOVING PICTURE WORLD Plate No. 3. away from the sprockets by about twice the thickness of an ordinary film. If too close it will have a decided tendency to cause the film to run off the sprockets. If too far away, it will allow the film to climb the sprocket teeth; in either event the tendency is to lose the loops, or at least shorten one of them. Adjustment of sprocket idlers is very important and should be carefully looked after by the operator. The lower sprocket idlers which are inside of casing 485, P I, are adjusted in relation to the sprocket by means of set screw 538, P i. On the right side of casing 485, P I, right next to the casting, you will see the end of one of the roller spindles. Adjust screw 538, P i, until this roller just begins to turn when the machine is run with the film in, after which set up set screw lock-nut. Upper sprocket 451. P 3, is adjusted by means of a set screw in the bracket just to the left of the roller. By moving this screw in or out the rollers are set closer to or further away from the sprocket. After adjusting be sure and set up the lock-nut so that screw cannot move. Intermittent sprocket idlers Plate No. 4. 486, P 2, are adjusted in relation to the sprocket by mean of set screw 537, P i. You can tell when this adjustmen is properly made as follows: When there is no film in th machine the idler which shows on the front of the gate wil remain stationary when the crank is turned. Place film in the machine and adjust set screw 537, P i, until thi idler roller just barely begins to turn, after which set u; the lock-nut to hold this screw tight. No. 28. Adjusting Intermittent Movement. The inter mittent sprocket should have just a little circumferentir play, but not much. If star 401, P 2, is set up too tigh against cam 410, P i, expansion of the parts, through hen engendered by friction and from the spot, may cause thei to bind too much, thus producing undue friction. For thi reason there should be just a little play. When this become too great through wear, however, the star 401, P 2, must b No. 27. Idler Bracket Adjustment. Sprocket idlers 48! P 2, 450, P 3, and those inside 485, P i, must be kept s«