Browse Prior Art Database

SHAFT/BEARING ARRANGEMENT FOR A POINTER ASSEMBLY

IP.com Disclosure Number: IPCOM000024514D
Original Publication Date: 1980-Dec-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 114K

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 tracking ball and then to the rotation of two encoders (at right angles to each other) which digitize its movement.

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Page 1 of 2

SHAFT/BEARING ARRANGEMENT FOR A POINTER ASSEMBLY
L. Neil Goodman Jimmie D. New

Proposed Classification
U.S. Cl. 308 Int. Cl. F16c

W FIG. 2

PRICR ART

Volume 5 Number 6 November/December 1980 597

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SHAFT/BEARING ARRANGEMENT FOR A POINTER ASSEMBLY (Cont'd)

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 tracking ball and then to the rotation of two encoders (at right angles to each other) which digitize its movement.

A concept is disclosed which provides an improved shaft/bearing system for the commutator of the encoder. The primary problems with the prior art design were
(1) poor axial alignment control of the commutator because of tolerance build-up and (2) difficulty of assembly of screws in shaft ends located opposite the commutator because of limited access space.

With reference to Figure 1, pointer assembly 10 includes housing 12, commutator drums 14, flange bearing 16, shaft 18 and bolts 20. Figure 2 is the section of Figure 1 and discloses the housing 12 with axial opening 22. Flange bearings 16 fit into each end of axial opening 22. Flange bearings 16 fit into each end of axial opening 22 and over respective ends of shaft 18. The commutator drum 14 is attached by bolt 20 to one end of shaft 18 while spacer 24 and bolt 20 attach to the other end of shaft 18.

With reference to Figure 3, the present concept is disclosed with housing 12 containing axial opening 22 formed therein. Cutouts 26 are formed in housing 12 coaxial with axial opening 22. Plain bearings 28 replace the...