Browse Prior Art Database

LOAD BEARING ASSEMBLY TECHNIQUE FOR A POINTER ASSEMBLY

IP.com Disclosure Number: IPCOM000024592D
Original Publication Date: 1981-Apr-30
Included in the Prior Art Database: 2004-Apr-02

Publishing Venue

Xerox Disclosure Journal

Abstract

A pointer assembly refers to a cursor positioning device used in conjunction with a CRT display terminal. Displacement, speed and direction of the cursor are provided by the pointer. The pointer is a handheld device operated by rolling it over a flat surface. The movements are converted first to the rotation of a trackball and then to the rotation of two encoders (at right angles to each other), which digitize its movement. In order for the trackball to transfer motion to the commutator shaft by means of friction, there must be a normal force imposed between the trackball and the commutator shaft at all times.