Browse Prior Art Database

Digital Motion Verifier

IP.com Disclosure Number: IPCOM000073850D
Original Publication Date: 1971-Feb-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Burkhart, PH: AUTHOR [+2]

Abstract

A mechanical incrementer 2, such as a stepping motor, receives an input from a control device 3 directing that a discrete number of steps be taken. The incrementer output shaft 4 drives the associated gearing 5 and also though coupling 6, drives a rotary accelerometer 7. Acceleration of shaft 4 is transduced as an electrical signal by rotary accelerometer 7. This electrical signal is passed through interface circuit 8 to make the signal output compatible with the control device 3. As shown, the same number of positive (or negative) accelerations are supplied to counter 10 as the number of steps N which were taken (the counter being held at reset until the command to move is given).

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Digital Motion Verifier

A mechanical incrementer 2, such as a stepping motor, receives an input from a control device 3 directing that a discrete number of steps be taken. The incrementer output shaft 4 drives the associated gearing 5 and also though coupling 6, drives a rotary accelerometer 7. Acceleration of shaft 4 is transduced as an electrical signal by rotary accelerometer 7. This electrical signal is passed through interface circuit 8 to make the signal output compatible with the control device 3. As shown, the same number of positive (or negative) accelerations are supplied to counter 10 as the number of steps N which were taken (the counter being held at reset until the command to move is given). The count N is delivered to comparator 11 whereupon control unit 3 ascertains the difference between the number of steps of the command and the number of steps, N taken. If the difference is zero, the move is verified and a signal generated at output 12. Any other value indicates that the wrong number of steps have been taken.

By using an up-down counter, the system may be used as a memory type unit that would remember the present location with reference to the start location. This is accomplished using the stepping motor direction bit to gate upon adding or subtracting counts.

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