A twin link robotic arm has first and second arm links and a grounded firstrotationsynchronization member. The first arm link is rotatable relative to thegrounded first rotationsynchronization member about a first axis of rotation. The second arm link isrotatably mounted tothe first arm link and is rotatable relative to the first arm link about asecond axis of rotation. Asecond rotation synchronization member is provided on the second arm link. Thesecond rotationsynchronization member is non-rotatably fixed relative to the second arm linkand is rotatablerelative to the first arm link about the second axis of rotation. A rotationsynchronizing couplerconnects the first rotation synchronization member to the second rotationsynchronization memberand drives rotation of the second arm link relative to the first arm linkabout the second axis ofrotation when the first arm link is rotated about the first axis of rotation.
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