To reinforce the suction force from my previous version cleaning robot, I added a roller with brushes and sweeper to multiply cleaning force and it makes the robot a completed version of hand made robot. To achieve the roller and sweeper, I tried to think a way not to use motor to drive them ( since it wastes of battery power) but using gears to trigger both roller and sweeper. The video shows the result and idea of that, 3 gears for the sweeper are connected to the roller with 1 motor and it works just fine.
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