Patent GB-756759-A (GB)
Title: Means for controlling telephone answering devices
IPC: H04M1/64
Filed: 1954-02-22
Abstract: 756,759. Substation circuits. DEVENTER, H. R. VAN. Feb. 22, 1954, No. 5105/54. Class 40(4). Control mechanism responds to ringing current to deliver a talk-out message from a first recorder to the calling line, the end of the message operating a switch to connect a second recorder to the line to receive a message from the calling party for a predetermined time. Recording the talk-out message. Depression of button 20 energizes amplifier 21 and connects its output 21b to transducer 27. Button 20 also energizes talk-out driving motor 23 and timer motor 42. The telephone transmitter 28 may now be used as a microphone for recording a message on tape 24. Release of button 20 and depression of button 30 reverses motor 23 to rewind the tape. Playing back the talk-out message. Operation of button 32 energizes motor 23 and timer motor 42 and connects transducer 27 to the input of the amplifier and the T1 side of the telephone instrument to the output. Timing device 31 moves with the tape 24. At the end of the talk-out message push-button 32 is restored and contacts 37 are moved manually to the left so as to be closed by contact with carriage 35, neon lamp 38 lighting. Depression of key 30 restores the tape 24 and the timer 31. When the carriage 35 reaches home position it opens switch 36 to stop the motor 23. Answering incoming calls and taking a message from the calling party. Operation of button 40 sets up a circuit to a motor-driven timer 41 which controls the duration of the answering cycle. Contacts 40-3 connect lead L1 of the telephone line to the output side of the amplifier. When a call is received relay 47 energizes to energize timer motor 42 at each pulse of ringing current until cam 43 operates switches 45, which return ground to lead L2, energize amplifier 21, operate the supervisory relay at the exchange, and energize timer motor 42 continuously. Contacts 45-4 also energize motor 23 to drive the talk-out tape 24 and timer 31. At the end of the talk-out message, contacts 37 close to energize mid-cycle relay 46, which energizes motor 53 to drive the messagetaking tape 54 and reverses motor 23 to rewind the talk-out tape 24. Relay 46 also reverses the input and output of the amplifier so that speech on the line is recorded on tape 54. A cam 59 driven by motor 53 periodically supplies busy tone to the line. When cam 43 completes its revolution, switches 45 open to reset the circuit for another call. Playing back recorded messages. Button 64 is depressed to return tape 54 to starting position. Depression of button 64 then drives tape 54 in the forward direction and makes appropriate connections to the amplifier. Permanent magnets 67, 65 can be manually swivelled to clear the tapes 24, 54. Recording a two-way conversation. Depression of button 68 grounds lead L-2, connects lead L-1 and side T-1 of the telephone instrument to the input of the amplifier, and operates relay 46 to energize motor 53. Relay 46 also connects transducer 57 to the output of the amplifier. Cam 59 periodically impresses a tone signal on the line during the recording. Recording locally using the telephone transmitter as microphone. Depression of key 69 energizes relay 46 so that speech into the microphone is recorded on tape 54. Normal telephone operation. Depression of button 70 connects the telephone instrument to line in the normal manner.