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Incremental Feedback Servo System

IP.com Disclosure Number: IPCOM000091184D
Original Publication Date: 1969-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Merry, TG: AUTHOR [+2]

Abstract

Workpiece 2 is processed using vibrating electrode 3 carried by transducer 4. The advance of electrode 3 is controlled by stepping motor 5 acting through lead screw 6. Transducer 4 vibrates electrode 3 causing contact between such electrode and workpiece 2 for a predetermined period of each cycle. Such contact time is automatically controlled by motor 5.

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Incremental Feedback Servo System

Workpiece 2 is processed using vibrating electrode 3 carried by transducer
4. The advance of electrode 3 is controlled by stepping motor 5 acting through lead screw 6. Transducer 4 vibrates electrode 3 causing contact between such electrode and workpiece 2 for a predetermined period of each cycle. Such contact time is automatically controlled by motor 5.

The initial portion of the circuit controlling motor 5 is input level detector 7 which shapes the electrode 3 voltage waveform into an asymmetrical square wave. The output of voltage detector 7 drives two circuits. One is safety circuit 8 to raise electrode 3 whenever it shorts to workpiece 2. The other is diode clamp circuit 9 which integrates the square wave to convert the time base to voltage levels. Circuit 8 is basically an averaging circuit which turns on to raise electrode 3 when it shorts to workpiece 2 for more than a predetermined duration. Clamp 9 functions to convert contact time into voltage levels which can be detected by level detectors 10 and 11 and is utilized to adjust the contact time.

Uplevel detector 11 and downlevel detector 10 respectively identify when the waveform exceeds upper and lower thresholds to trigger the associated detector which then generates an output pulse for each cycle of transducer 4. Because motor 5 cannot respond to the applicator frequency, the pulse rate is reduced to 500 Hz by frequency down converter circuits 12 and 13. These are dri...