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Drive system for projection platters


Ethan Brake
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I was hoping someone could explain to me how the drive system on a platter works, pertaining to the film speed. Obviously, as the film empties off of one platter, it has to turn slower. What adjusts the motor to keep it turning at the appropriate speed so the film doesn't unravel onto the floor?

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You're correct Ethan, if you watch this YouTube video you'll see there's a variable speed control unit in the centre of the feed platter constantly adjusting the feed out speed ( at 1':35" )
You can guess what'll happen if the controller goes wrong !

 

John S 😎

 

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Thanks for the video, that's the best view of one of those I've been able to find. I'd like to know mechanically how it actually works. I've found a couple pdf manuals for the platter systems from Film-Tech, but they don't explain how that mechanism works.

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