is it better to use shaft coupling to drive the main roller of sugar cane juicer or will it better to use spur gears or chain sprockets or pullies? which mode is more efficient?
Is this to drive the two rollers? As they will be contra-rotating, gears are the obvious answer.
If it's to give advantage in turning the roller pair, I personally would go for a chain drive, belts will slip if the juice gets on them, gears are over complicated for this application.
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yes...the coupling will indirectly rotate both the rollers but it will only be connected to the 1st starting roller's shaft; that shaft will additionally have a gear fitted onto it..meaning...the shaft will have first gear on it then a coupling which will join it to the shaft of the gear-motor. then the gear of THIS shaft will rotate the upper and second gear, fitted onto second shaft of the second-roller. keep in mind that it's a two roller juicer.