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592
MOTION PICTURE HANDBOOK
Machine Take-Up
The take-up of a projector is an extremely important part of the mechanism, although until quite recently it seems to have .received but little consideration from any one, except the projection department of the Moving Picture World, which has for several years been persistently advocating the invention and adoption of a take-up tension equalizer.
The old style take-up had grievous faults. Selecting the old style Edison take-up for the purpose of illustration, parts of which are shown in Fig. 283, it consists essentially of spindle 1 carried by bearing 4, the latter clamped in a cast
/ 13
Figure 283.
ing attached to the mechanism, or in some machines by the lower magazine. Friction disc 6 was rigidly attached to spindle 1, and revolved therewith. Belt wheel 8 was mounted on shaft 1, upon which it revolved freely, using the shaft merely as an axle. Seven was a friction washer, usually made of fiber. The action was as follows: The reel was mounted on shaft 1, to which it was locked by dowel 13, the dowel engaging with the notch in the reel hub; the reel was prevented from slipping off the shaft by part 2. Spring 12 was placed on the shaft and compressed by collar 14, which was held in place by a thumb screw therein and by cotter pin 9. Now it requires but a moment's study of this assemblage to see that, since disc 6 is attached rigidly to shaft 1, whereas belt wheel 8 revolves freely thereon, when belt wheel 8 is driven, power will be imparted to shaft 1 through disc 6 exactly in proportion to the pressure with which the belt wheel is clamped against disc 6, or rather fibre washer 7, which, in turn, impinges on disc 6. AH this is quite simple.