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I am designing a new mowing system that can effectively mow around poles. The machine consists of an arm that is attached to the back of a tractor and runs off its PTO. At the end of the arm is a rotating - boomerang- shape head that when it comes into contact can turn 180 degrees around a pole before snapping back into place. There are three blades on the bottom of the head that is turned by pulleys and belts that receive power from a rotating shaft off of the mower arm. If the head was to remain stationary. This would be no issue, but the problem is that the head is supposed to be allowed to freely swivel around the pole and that will be affected by the belt system that receives power from the shaft we want to swivel around. -Ill add in drawings to be clear - enter image description here

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I am assuming that a gearbox will need to be added to the shaft off of the arm to allow for the two rotations and for the mower head to be able to swivel back to its original position via a torsion spring and keep the belt from slipping. I am just having some trouble visualizing what that configuration will look like. Some ideas I had would be some type of planetary gearbox or incorporating some kind of anti-reverse gear that will only attach when the head begins to swivel to change the speed of the belt to compensate.

Any help will be greatly appreciated.

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