Browse Prior Art Database

Position Control System

IP.com Disclosure Number: IPCOM000082413D
Original Publication Date: 1974-Dec-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Arter, NK: AUTHOR [+3]

Abstract

In a rotary (or rectilinear) positioner, a single position-sensing cell not only controls the position of a rotary device but also, with an invertable amplifier, enables a rotary device to be commanded to go clockwise wise or counterclockwise. An invertable amplifier is one in which the output signal is selectively inverted or not inverted in accordance with a control signal.

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 62% of the total text.

Page 1 of 2

Position Control System

In a rotary (or rectilinear) positioner, a single position-sensing cell not only controls the position of a rotary device but also, with an invertable amplifier, enables a rotary device to be commanded to go clockwise wise or counterclockwise. An invertable amplifier is one in which the output signal is selectively inverted or not inverted in accordance with a control signal.

Position A is a desired stable position for either edge B or C of the control cam. The cam is stable whenever either of the cam control edges B, C covers one-half a light beam impinging on the single optical sensing cell. The optical sensing cell supplies a signal through a suitable amplifier to a + voltage detector for indicating a light condition. The same signal is supplied through an inverting amplifier I to a + voltage detector for detecting dark conditions.

When the light and dark areas are equal, i.e., edge B is splitting the light beam in half, amplifier A supplies a reference potential. As a result, the two + voltage detectors supply equal output amplitude signals to the position detector. Then, the position detector signifies to rotary motion control that either control edge B, C has been reached and is centered at A.

When motion to an opposite stable position is desired (edge C rotates to position A), the signal on line A/B is inverted causing the invertable amplifier IA to change its amplification, thereby supplying a different signal through the summer to...