US Patent 10455770 Needle coupling device for an agricultural baler

A baler including a bale chamber; a plunger to compress crop material in the bale chamber to form a bale; a plurality of knotters; a needle yoke with a plurality of needles to deliver a plurality of lower strands through the bale chamber to the plurality of knotters; a tucker arm shaft carrying a plurality of tucker arms to deliver a plurality of upper strands to the plurality of knotters; a driving shaft located above the bale chamber and extending in a traverse direction of the baler; wherein the tucker arm shaft extends parallel to the driving shaft; a tucker arm coupling device to covert the rotation of the driving shaft into a rotation of the tucker arm shaft; a needle coupling device to convert a rotation of the driving shaft into a movement of the needle yoke from a rest position to a twine delivery position and back.