Patent GB-1258000-A (GB)
IPC: H04M1/65
Filed: 1969-05-20
Abstract: 1,258,000. Telephone answering device. FORD INDUSTRIES Inc. 20 May, 1969 [14 Feb., 1969], No. 25741/69. Heading G5R. In a telephone answering device including recording and playback means co-operating with a magnetic tape, the tape drive motor is rocked at the end of an announcement message to reverse the tape drive and return the tape to its initial position at which the direction of drive is again reversed for recording the caller's message. When a call is received on telephone 38, ring detector 406 operates, closing contact 400, whereby current is supplied to drive motor 118, to operate solenoid 360 and relay 416 and to charge capacitor 424. Solenoid 360 moves plunger 362 to the left, rotating crank 368 into engagement with projection 112, whereby transducer head 50 is moved into a position on tape track 48a. The crank also actuates a switch 388 which provides a second supply circuit for the motor &c., and operates circuits (not shown) for stopping the ringing and connecting the head 50 to the telephone line. A third supply circuit to the motor is also connected via relay contact 416b. The motor 118 which is pivotally mounted on trunnions 128 now drives the tape forwardly via drive shaft 134 and ring 64 coupled to take up spool 52, and an announcement message on track 48a is transmitted to the caller. Rotation of drum 54 by unwinding of the tape thereon drives a timer drum 192 via gearing causing a pin 156 running in a track on the drum to move a slide member 146 to a position in which a spring bias mechanism 148, disposed between the slide and motor support bracket 122, stops just short of its over-centre position. The movement of slide member, via cam 162a, also changes over switch 382 to connect the supply to contact 382c. On completion of the announcement message a cam 264 on the timer engages and opens switch 384a, thus de-energizing solenoid 360. The return of the plunger 362 to the right brings conical surface 364a on the plunger head into contact with cam face 168a on the slide member 146, moving the latter so that the bias mechanism moves over centre and pivots motor 118 about its support bearings 128 so that part 140 of the motor drive shaft now drives supply spool 54 to move the tape in reverse. The return of the plunger also allows the head to return to a position defined by a cam 328-in this case over track 48b and also releases switch 388 whereby a connection is established between the telephone line and the head to allow a message to be recorded when the tape has been rewound to its initial position. During this period recording is prevented by transmitting, e.g. an audio tone to the caller via a switch 380 operated when the motor was pivoted. Reverse rotation of drum 54 also drives the timer drum 192 in reverse and when the pin 156 running in the timer drum track has been returned to its initial position, corresponding to the initial tape and slide member position, the bias mechanism again moves over centre and rocks the motor back to its initial position. The tape drive now moves the tape forwardly and a message can be recorded on track 48b of the tape. Switch 382 again switches over during which time the motor is driven via contact 416b of relay 416 which is maintained energized by discharge of capacitor 424. The timer mechanism again moves slide member 146 and bias mechanism 148 to its just off over centre position and this situation remains for, e.g., 30 seconds during which the incoming message is recorded until cam 222 on the timer drum engages surface 292a on a second slide member 278 and moves it to position 278b from which spring 296 returns it to its initial position. Pawl 294 on the slide shifts ratchet wheel 280 by one position and such movement causes member 336 of detent mechanism 332 to shift momentarily to the left, striking cam face 170b and moving slide member 146 upwardly so that bias mechanism is again moved over centre to rock the motor to its reverse drive position. The slide member 146 is returned to its initial position as before, the final part of the movement switching over switch 382 so that the motor is de-energized. The shifting of the ratchet by one position moves cam 328 so that the next message is recorded in track 48b. Manual means are provided for shifting the wheel 280 and cam 328 so that the recorded messages can be played back to the subscriber.