Browse Prior Art Database

Coiled Robotic Power and Signal Cables

IP.com Disclosure Number: IPCOM000039976D
Original Publication Date: 1987-Sep-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Alewine, NJ: AUTHOR [+5]

Abstract

This article describes a guide mechanism for a robotic cable assembly. In a telescoping robot arm the continuous telescoping motion of the arm mechanism makes it difficult to run power and signal cables around the assembly to the three axes of the robot's wrist. The position feedback from the wrist assembly's three joints is accomplished by sending analog or digital signals from position potentiometers or encoders to the system control unit by way of shielded cables. These signals are, however, highly susceptible to electrical noise and cannot therefore be transmitted with the motor power signal leads, but must be in a separate shielded cable assembly. In the arrangement disclosed herein, two coiled retractable cables are utilized.

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Coiled Robotic Power and Signal Cables

This article describes a guide mechanism for a robotic cable assembly. In a telescoping robot arm the continuous telescoping motion of the arm mechanism makes it difficult to run power and signal cables around the assembly to the three axes of the robot's wrist. The position feedback from the wrist assembly's three joints is accomplished by sending analog or digital signals from position potentiometers or encoders to the system control unit by way of shielded cables. These signals are, however, highly susceptible to electrical noise and cannot therefore be transmitted with the motor power signal leads, but must be in a separate shielded cable assembly. In the arrangement disclosed herein, two coiled retractable cables are utilized. Each of the cables is of different diameter, and the cables are arranged so that the smaller of the two cables fits inside the inner diameter of the larger cable. In order for this system to function properly, a plastic rod is inserted in a hollow metal tube which acts as a spine to give the cables support during movement and prevent the coils of the smaller cable from becoming entrapped in the coils of the larger cable. In the drawings, Fig. 1 is a side view partly in section of the telescoping arm assembly showing the guide mechanism, and Fig. 2 is an end view. The guide mechanism is shown attached to the robot arm. A bracket 1 supports the hollow metal tube 2 which is located in the inner diame...