Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Spiral Library

IP.com Disclosure Number: IPCOM000088799D
Original Publication Date: 1977-Aug-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Rueger, WJ: AUTHOR

Abstract

Conventional libraries are arranged so that articles are accessed (removed or replaced) by a picker which requires both "X" and "Y" motion control.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Spiral Library

Conventional libraries are arranged so that articles are accessed (removed or replaced) by a picker which requires both "X" and "Y" motion control.

An alternative approach to access articles which eliminates the cumbersome X, Y motion control is to arrange the articles on a plane in an array forming a spiral. The articles can be accessed by a rotating arm carrying the picker mechanism. If the spiral radius increases at a constant rate per revolution, the picker position can be controlled by a cable or web wound around a cylinder whose circumference equals the pitch or increase of the spiral pattern. From a control viewpoint, a spiral array appears as a long single line of positions.

This arrangement is advantageous as selection of a specific position can be done with a simple counter. The capacity of the library can be doubled by adding a second array with one selector mechanism between the two arrays. The access time can be reduced by rotating the cylinder on which the access cable is wound to use a multiple pitch spiral or give full control over radial motion of the accessor. For example, a five revolution single array spiral would store 150 cartridges.

1