Browse Prior Art Database

Phasing Control for Dictating Machine

IP.com Disclosure Number: IPCOM000096039D
Original Publication Date: 1964-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 59K

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 adjust the position of transducer 11 with respect to the helical recording pattern 12 on the belt, when the previously recorded belt is inserted for either playback or further recording. If transducer 11 is positioned between adjacent convolutions of pattern 12 rather than directly over one of the convolutions of pattern 12, there results either undesirable cross talk or low volume output or both.

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Phasing Control for Dictating Machine

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

Proper positioning of transducer 11 is accomplished automatically when belt release lever 13 is manipulated to change a belt 10. Pulling lever 13 forward actuates apparatus, not shown, to raise transducer 11 from belt 10 and move idler roll 14 to permit removal of belt 10 from the dictating machine. Arm 15 connected to release lever 13 carries pin 16 which rides in elongated slot 17 in bellcrank 18. When lever 13 is pulled forward, bellcrank 18 pivots counterclockwise about pivot pin 19 until stationary stop 20 is engaged. The end of the longer leg of bell-crank 18 presses against helical cam 21 formed on the end of leadscrew 22 mounting transducer 11. Leadscrew 22 is moved axially against a spring bias, not shown, by an amount, depending on the rotational orientation of leadscrew 22 and cam 21, to position transducer 11 in predetermined relation with respect to belt 10.

As such action occurs, tab 25 carried by arm 15 rides under...