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Magnetoresistive Position Sensing and Motion Control of Print Corners

IP.com Disclosure Number: IPCOM000078804D
Original Publication Date: 1973-Mar-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Gilbreth, FM: AUTHOR [+3]

Abstract

A magnetoresistive transducer, in combination with a recorded magnetic surface, can accomplish the position and velocity sensing functions required for closed-loop position control of a rigid body. This type of transducer can be applied to control the motion of a stop-start type of belt, chain, wheel or ball printer.

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Magnetoresistive Position Sensing and Motion Control of Print Corners

A magnetoresistive transducer, in combination with a recorded magnetic surface, can accomplish the position and velocity sensing functions required for closed-loop position control of a rigid body. This type of transducer can be applied to control the motion of a stop-start type of belt, chain, wheel or ball printer.

A magnetoresistive transducer 10 is shown in Fig. 1, positioned to read a series of unique recorded magnetic signals on a tape 12 secured to a single element type carrier such as the drum 14, which carries a plurality of type characters 16. By having each type character represented by a unique binary code of magnetic bits 17, the transducer 10 can detect which type character is in the print position whether the drum is moving or is stationary. Thus it is possible to determine at any instant how far and in which direction the type carrier needs to move, to print the next desired character. The necessary movement is thus more expeditiously determined and accomplished than in other methods, which require motion for determination of position and velocity.

In Fig. 2 a magnetoresistive transducer 10 is positioned to read magnetically coded spots 18 imbedded along a plastic type belt 20, having upstanding flexible fingers 22 bearing type characters 24.

A print hammer 26 is positioned within the confines of the belt for impacting selected type bearing fingers 22 against a document 27. The...