Browse Prior Art Database

Incremental Position Information for Linear Motion

IP.com Disclosure Number: IPCOM000083130D
Original Publication Date: 1975-Apr-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Barela, DA: AUTHOR [+3]

Abstract

In picking or replacing a tape cartridge in a rectangular coordinate library system wherein each cell location has an X-Y coordinate, the picker mechanism must be accurately positioned. Generally the picker mechanism is driven by a servo-controlled motor.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Incremental Position Information for Linear Motion

In picking or replacing a tape cartridge in a rectangular coordinate library system wherein each cell location has an X-Y coordinate, the picker mechanism must be accurately positioned. Generally the picker mechanism is driven by a servo-controlled motor.

The figure depicts an apparatus for obtaining incremental position information in the "X" direction. A similar arrangement would be used for obtaining incremental position information in the "Y" direction.

A linear transducer strip 10, having a plurality of incremental positioning markings 12, is positioned adjacent to library system 14 and along the path of travel of a picker mechanism, not shown. Library system 14 is comprised of a plurality of X-Y coordinate cells and each cell contains a tape cartridge, both of which are not shown.

Incremental positioning markings 12 are readable by read means 16 (two-phase linear tachometer), which is associated with transducer strip 10. Read means 16 rides on wire rope 18 and wire rope 18 is fixed to idler pulley 20 and motor pulley 22. Motor pulley 22 is driven by DC motor 24.

In operation, both magnitude and direction information is fed into controller 26 from read means 16. Controller 26 outputs a servo signal which is used to control the DC motor 24 and to position the picker mechanism to pick a selected cartridge.

1

Page 2 of 2

2

[This page contains 3 pictures or other non-text objects]