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Shaft Encoder With Single Track

IP.com Disclosure Number: IPCOM000087159D
Original Publication Date: 1976-Dec-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Martino, MJ: AUTHOR

Abstract

In the drawing, ring 2 represents a track that is formed on the outer surface of a rotatable shaft or on the flat surface of a disk carried by such a shaft. The track is divided into a binary number of sectors that are painted or otherwise arranged to represent 0 and 1 digits. In the drawing, a 1 digit is represented by crosshatching and a 0 digit is represented by the absence of crosshatching.

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Shaft Encoder With Single Track

In the drawing, ring 2 represents a track that is formed on the outer surface of a rotatable shaft or on the flat surface of a disk carried by such a shaft. The track is divided into a binary number of sectors that are painted or otherwise arranged to represent 0 and 1 digits. In the drawing, a 1 digit is represented by crosshatching and a 0 digit is represented by the absence of crosshatching.

Sensors 3, 4 and 5 are located at particular points along the track to read the 1 or 0 that is carried by the sector under the sensor. As this apparatus is shown in the drawing, each sensor is located over a 0 bit, and this position can be considered as the reference position of track 2. As the track rotates clockwise the readers produce the sequence of signals that are shown in the following table. A decoder 6 receives the coded input and produces a sequential coded output.

SENSOR OUTPUT SENSOR OUTPUT DECODER OUTPUT DECODER OUTPUT CODE (DECIMAL) CODE (DECIMAL)

0 0 0 0 0 0 0 0

1 1 1 7 0 0 1 1

1 0 0 4 0 1 0 2

0 1 0 2 0 1 1 3

1 0 1 5 1 0 0 4

0 0 1 1 1 0 1 5

1 1 0 6 1 1 0 6

0 1 1 3 1 1 1 7.

This technique can be extended to single-track codes with additional digits for finer resolution.

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