Browse Prior Art Database

Phasing Control for Dictating Machine

IP.com Disclosure Number: IPCOM000094801D
Original Publication Date: 1965-Jun-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Related People

Dollenmayer, WL: AUTHOR

Abstract

The mechanism automatically corrects for any phasing errors between cylindrical magnetic record belt 10 and transducer 11. Transducer 11 is mounted on a carrier which has a releasable driving engagement with leadscrew 12 while belt 10 is received over drive and idler capstans. Rotation of belt 10 and leadscrew 12 causes a helical recording pattern to be formed on belt 10.

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Phasing Control for Dictating Machine

The mechanism automatically corrects for any phasing errors between cylindrical magnetic record belt 10 and transducer 11.

Transducer 11 is mounted on a carrier which has a releasable driving engagement with leadscrew 12 while belt 10 is received over drive and idler capstans. Rotation of belt 10 and leadscrew 12 causes a helical recording pattern to be formed on belt 10.

Pivoted from stationary member 14 is support arm 15 that carries forward and reverse sensing contacts 16 and 17. Sensing arm 18 is pivoted to arm 15 and has a contact portion adapted to engage and complete an electrical circuit with either contact 16 or contact 17. Lead-screw 12 is spring-biased to the left against phasing lever 19. The lateral position of leadscrew 12 is determined by the orientation of phasing cam 20. This is carried on shaft 21 and can be rotated by manual phasing knob 22 or phasing ratchet 23 having two series of teeth 24 and 25. Forward and reverse phasing solenoids 26 and 27 have plungers which are adapted to engage the series of teeth 24 and 25 on ratchet 23. Belt 10 bears a mark, such as aperture 28 adjacent one edge, which is detected by sensing unit 29 to actuate an electrical circuit once each revolution of belt 10.

In operation, a properly orientated belt 10 is placed over the drive and idler capstans. Transducer 11 is positioned in predetermined relation with respect to the left edge of belt 10. The dictating machine is initiall...