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MANAGERS AND PROJECTIONISTS 733
END PLAY OF INTERMITTENT SPROCKET SHAFT.
To eliminate this, loosen, hut do not remove the two set screws in the collar on the end of the intermittent sprocket shaft. With two fingers of the left hand pull the sprocket toward the outer bearing, at the same time, using the thumb of the same hand, shoving the collar on the outer end of the shaft inward, against the bearing. In other words, force the sprocket and collar towards each other and against the bearing, holding them thus while you tighten the holding collar set screws. USE JUDGMENT, however, and do not exert sufficient force to set up undue friction between the hub of the sprocket, the collar and the bearing.
TO REMOVE THE INTERMITTENT SPROCKET, first remove the entire intermittent movement unit from the mechanism and take the cover from the oil well, as per the directions previously given. Remove the intermittent stripper, wThich is the metal shield between the rims of the intermittent sprocket. Take off the collar on the outer end of the intermittent sprocket shaft. Then, using a sprocket pin tool, which may be procured from any simplex distributor (without this tool you should not undertake the removal of an intermittent sprocket at all), remove the two pins which hold the intermittent sprocket to its shaft.
WARNING. — Do not hammer, or in any way mutilate the sprocket pins. You must do this job RIGHT, or NOT DO IT AT ALL.
Having removed the pins, holding the framework of the unit firmly, proceed to pull the intermittent sprocket shaft and staf out at the oil well end, placing the end of a stick of hardwood against the shaft and tapping it lightly if necessary.
In this connection we strongly recommend to your consideration General Instruction No. 5, page 631, or that part of it titled "Spare Intermittent Movement. ' Also the instruction concerning installing an intermittent sprocket on its shaft, page 712. If you force an intermittent sprocket on its shaft, it is ten chances to one that an unsteady picture will result.
THE TAKEUP. — The Simplex takeup is illustrated in Fig. 263. See General Instruction No. 23. The illustration, taken in connection with General Instruction No. 23 seems to supply all necessary instruction.
SIMPLEX SPEED CONTROL.-— The control by means of which projection speed is regulated is positive in its action. Its flexibility is such that any speed desired between a min