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MOTION PICTURE PROJECTION 671
bearing K below, thus the weight of the rotor and armature takes the place of a nut in binding the inner race of J to the shaft.
The thrust bearing K rests on a spherical seat which renders it self -aligning. A screw set into the bottom of the shaft holds all the members of the thrust bearing loosely in place, which is an aid in assembling. When the rotor shaft is put into its proper position the thrust K will rest on the washer M, relieving screw N of any connection with the bearing or any of its parts. Both of these bearings are enclosed and guarded against dirt, grit and moisture by the bearing housing cap on the motor shaft. A grease cup shown on the side of the machine supplies the lubrication for both bearings.
The center bearing is seated on the upper part of the rotor shaft, as already stated. It is held thereon by a lock nut F pressing it against the opposing shaft shoulder. The grease retainer H, mounted on the shaft and revolving with it, completes the enclosure. A second grease cup shown on the side carries lubrication to a tube entering above the bearing.
The upper bearing of the generator is in the housing D, being a free fit therein. Its race is held on the cap A by the stud B, secured by the lock nut C. This stud is hollow and takes a grease cup above, leading the grease into the housing D immediately below the bearing. A glance will show that there is a triple barrier against the entrance of dirt or moisture, one where the cap A sets into the housing D, a second one where the extension of the top yoke fits around D, and a