Would some kind of linear cutter do the job?  I'm thinking that something
    like hedge-clippers might give you better cutting efficiency.

I'm having this mildly amusing vision of a robotic goat.  Think of something
like a scaled up Tilden BEAM robot.  Sits there in the sun soaking up energy
for a bit, and then ... munch munch munch ... a little patch of grass gets
"eaten" (clipped) and the robot moves a foot or so and waits for more sun.

 :-)
BillW

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