Browse Prior Art Database

Phasing Control Apparatus

IP.com Disclosure Number: IPCOM000096690D
Original Publication Date: 1963-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 62K

Publishing Venue

IBM

Related People

Dollenmayer, WL: AUTHOR

Abstract

In a dictating machine employing grooveless magnetic belt 10 as the recording medium, it is necessary to have devices for adjusting the physical position of transducer 11. This is with respect to helical recording pattern 12 on belt 10, when the previously dictated belt is inserted for playback, further recording or the like. If transducer 11 is positioned between adjacent convolutions of the helical recording pattern rather than directly over the recording pattern, either undesirable cross talk or low volume output results.

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Phasing Control Apparatus

In a dictating machine employing grooveless magnetic belt 10 as the recording medium, it is necessary to have devices for adjusting the physical position of transducer 11. This is with respect to helical recording pattern 12 on belt 10, when the previously dictated belt is inserted for playback, further recording or the like. If transducer 11 is positioned between adjacent convolutions of the helical recording pattern rather than directly over the recording pattern, either undesirable cross talk or low volume output results.

Proper positioning of transducer 11 is accomplished automatically when release lever 13 is actuated to change a belt. Pulling lever 13 forward actuates apparatus, not shown, to raise transducer 11 from belt 10 and move idler roll 14 to release the tension on belt. Thus, belt 10 can be removed from the dictating machine. The movement of lever 13 also lifts latch 15 out of aperture 16 in latch member 17. A spring biased operating plunger of switch 18 pivots spring actuating member 19 to the rear. The contacts of switch 18 close and drive motor 20 is energized. Lead screw 21, having a driving connection with transducer mounting carriage 22, is rotated in the direction indicated by arrow 23. This is due to action of motor 20 acting through a drive connection including drive gear 24. Eventually, projection 25 carried by gear 24 engages tab 26 on member 17 which pulls member 19 to open the contacts of switch 18 and de-ener...