Robotic power and signal distribution using laminated cable with separator webs
Systems and methods that facilitate cables to pass through moving, space-constrained joints and conveying power and/or signals to various robotic joint-associated elements utilize a unitary and flat laminated cable slack within the joint to accommodate the relative motion between mechanical elements of the joints. In various embodiments, the cable has multiple insulated sub-cables; each sub-cable is insulated and physically separable from all other sub -cables. Some of the sub-cables are separated from the cable and electrically connected to joint-associated components for conveying signals and power thereto without mechanically interfering with relative motion between mechanical elements of the joint.
1. A method of conveying power and signals in a robot system comprising a joint including a plurality of mechanical elements configured for relative motion therebetween, and, passing through the joint, a cable comprising a plurality of insulated sub-cables in a unitary flat configuration for conveying power and signals, wherein (i) the cable is slack within the joint to accommodate the relative motion and (ii) each of the sub-cables is insulated and separable from all other sub-cables to accommodate a space within the joint, the method comprising: separating at least one sub-cable from other sub-cables by cutting along a thinned insulating divider therebetween without electrically affecting any of the sub-cables; making at least one of a mechanical or an electrical connection between the separated sub-cable and at least one joint-associated component for conveying signals and power thereto, the at least one of a mechanical or an electrical connection being made at an intermediate point along the cable spaced away from both ends of the cable; separating at least one second sub-cable, different from the at least one sub-cable, from other sub-cables by cutting along a thinned insulating divider therebetween without electrically affecting any of the sub-cables; making at least one of a mechanical or an electrical connection between the separated second sub-cable and at least one second joint-associated component for conveying signals and power thereto, the second joint-associated component being different from the joint-associated component; conveying signals and power via the sub-cables; and causing relative motion between mechanical elements of the joint, the cable and the connected sub-cables not mechanically interfering with the relative motion, wherein a separated length of the at least one sub-cable is different from a separated length of the at least one second sub-cable.
2. The method of claim 1 , wherein the at least one joint-associated component is spatially separated from the joint.
3. The method of claim 1 , wherein, along at least a portion of the cable, all of the sub-cables are physically accessible for removal from the cable to facilitate the separating step.
4. The method of claim 1 , further comprising:
separating a second sub-cable from other sub-cables by cutting along a thinned insulating divider therebetween without electrically affecting any of the sub-cables; and
making at least one of a mechanical or an electrical connection between the separated second sub-cable and at least one joint-associated component for conveying signals and power thereto, the at least one of a mechanical or an electrical connection being made at a terminal location along the cable proximate an end of the cable.
5. The method of claim 1 , wherein an entirety of the cable is slack within the joint.
6. The method of claim 1 , wherein a total length of the at least one sub-cable is smaller than a total length of at least one other sub-cable of the cable.
7. The method of claim 1 , wherein, along an entirety of the cable, all of the sub-cables are physically accessible for removal from the cable to facilitate the separating step.
8. The method of claim 1 , wherein at least one sub-cable comprises two conductors therewithin, the two conductors being insulated from each other but inseparable from each other.
9. The method of claim 1 , wherein a length of the cable passing through the joint remains constant during relative motion of the plurality of mechanical elements.