Mechanics mechanisms for conveyors

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I am interesting to know about the mechanics mechanisms that use the conveyors in products lines automations systems.
I am interesting to know more about "span" roller (I am not sure that I wrote "span" correct, I think that this mechanics mechanism have a wheel that stretched) and about roller drive systems, and about others mechanics mechanisms for conveyors and I am interesting to know the different between these different kinds of mechanics mechanisms for conveyors.
I will glad to receive some relevant links.​

 

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There is a great deal of useful information available on the mechanics mechanisms used in conveyors and automation systems. Here are a few links to get you started:- Conveyor Types and Uses: https://www.flexco.com/en/resources/guides-and-infographics/conveyor-types-and-uses- Introduction to Conveyors: https://www.flexco.com/en/resources/white-papers/introduction-to-conveyors- Types of Conveyor Belts Used for Industrial Purposes: https://www.elixirphil.com/types-of-conveyor-belts/ - Span Roller Drive Systems: https://www.i-mec.com/span-roller-drive-systems/ - Automation Conveyor System Components: https://www.conveyorsystemsltd.com/automation-conveyor-system-components.html - Guide to Conveyor Rollers: https://www.conveyorrollers.com/guide-conveyor-rollers/