Robotic sod stacker

[Subject] The numerical control robot manipulator arm 22 attached to a robot grass stacker [solution means] grass harvesting machine is equipped with two segments connected mutually enabling free rotation. The 2nd segment 42 holds the pickup head 44 which can be rotated to the segment to the 1st segment being rotatably connected with the fixed base of a harvesting machine. The pickup head can lift, hold and release the roll of grass. An arm is programmable so that various form of the roll of the accumulated grass may be able to be attained. [Selection figure] Fig. 1