Browse Prior Art Database

Robot Telescoping Arm and Drive Mechanism

IP.com Disclosure Number: IPCOM000040492D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 3 page(s) / 82K

Publishing Venue

IBM

Related People

Brady, WA: AUTHOR [+3]

Abstract

This article describes a robot telescoping arm and drive mechanism wherein the arm does not encroach on the space at the rear side of a fixed support member. Typically, a telescoping member of a robot arm or other mechanism which is required to extend and retract would require space behind the fixed portion of the mechanism so that the moving portion of the assembly can move into this space when retracted. The prismatic or telescoping robot arm assembly described in this article does not encroach on the space at the rear side of the fixed support member. Fig. 1 is a side view partly in section of the telescoping assembly. This assembly is constructed using one fixed casting member, and two moving members.

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Robot Telescoping Arm and Drive Mechanism

This article describes a robot telescoping arm and drive mechanism wherein the arm does not encroach on the space at the rear side of a fixed support member. Typically, a telescoping member of a robot arm or other mechanism which is required to extend and retract would require space behind the fixed portion of the mechanism so that the moving portion of the assembly can move into this space when retracted. The prismatic or telescoping robot arm assembly described in this article does not encroach on the space at the rear side of the fixed support member. Fig. 1 is a side view partly in section of the telescoping assembly. This assembly is constructed using one fixed casting member, and two moving members. The fixed member is made from a "U"-shaped aluminum casting and is machined so that two sets of cross roller bearing slides (cross section A-A, Fig.
2) may be mounted to the inside faces of the casting. These slides are the support bearings for the first of the two moving members of the assembly. The first moving member is similarly fitted with a set of roller slides and is the support for the second moving member.

(Image Omitted)

Controlled motion of the telescoping arm is accomplished by the use of an electric motor whose output shaft drives a self-locking worm and worm gear unit. The output of this worm gear unit serves as the input to a spur gear. This combination of motor, worm gears and spur gear is mounted to the fixed member of the telescoping arm. The first moving member of the system is fitted with a gear rack, and the spur gear driven by the motor output shaft is arranged so that the spur gear is in constant mesh with this gear rack. The spur gear when caused to rotate by the drive motor actuates the first moving member forward or backward on the cross roller bearing slides, depending on the drive motor rotation. The fixed member and the second moving member of the telescoping arm assembly are likewise fitted with gear racks. These gea...