JPS6244453B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention performs an incoming call operation in response to a ringing signal arriving from a telephone line, sends a response message recorded on a response tape to the caller, and also reduces the running time of the response tape. The present invention relates to an automatic answering machine configured such that answering operation time is regulated by. Information necessary for the caller and a message necessary for performing the response recording operation are recorded on the answering tape of such an automatic answering machine, and the message is sent to the caller after the call is received.
There is no problem if the caller uses a phone that is not a public phone, but if the caller uses a public phone to make a call, a paytone signal will arrive from the phone line when the phone line is closed. At the same time, a paytone signal notifying a fee reminder arrives. As a result, the response message is masked by the paytone signal, and the caller cannot clearly hear that part.
The interval between arrivals of such paytone signals becomes shorter as long-distance calls are made, and as a result, unclear parts due to masking increase. Furthermore, such automatic answering machine has a function of disconnecting the telephone line after a predetermined period of time if an accident such as cutting of the answering tape occurs and normal operation is no longer possible. The present invention aims to solve the problem of response messages being masked by paytone signals, and to provide a device that can accurately disconnect the telephone line in the event of an accident.See the drawings below. This will be explained in detail. The illustrated circuit is one embodiment of the present invention, and in the figure, 1 is a connection terminal with a telephone line, 2 and 3 are line transformers, 4 is an amplifier circuit that amplifies a calling signal arriving from the telephone line, and 5 is the amplification circuit. A rectifier circuit that rectifies the signal amplified by the circuit 4; 6 a transistor that performs on/off operation according to the output signal of the rectifier circuit 5; 7 a transistor 6;
This is a calling signal identification circuit that identifies the type of a calling signal based on the signal obtained by the on/off operation of the circuit, and outputs a signal corresponding to the type to output terminals 7a and 7b. Reference numeral 8 denotes a constant power supply circuit that supplies power to each circuit that is in an operating state in a standby state, such as the amplifier circuit 4 that amplifies a calling signal. Reference numeral 9 denotes a resistor 10 and a capacitor 1 connected between the power supply line of the constant power supply circuit 8 and the ground.
1. A first transistor 12, etc., which controls charging and discharging of the capacitor 11 and to which the output signal of the rectifying circuit 5 is applied to its base.
This is a station line control circuit. 13 is the output terminal 7a of the calling signal identification circuit 7 and the first station line control circuit;
a transistor 14 whose base is connected to the connection point between the resistor 10 and the capacitor 11 forming the transistor 9 ;
This is a second station line control circuit configured as follows. Reference numeral 15 denotes a third office line control circuit which is operated by a signal obtained from the output terminal 7b of the calling signal identification circuit 7; The application to is controlled by the second station line control circuit 13 . Reference numeral 16 denotes an LS relay circuit which is activated by the output signal of the third office line control circuit 15 and switches a switch 17 for closing the telephone line. Reference numerals 18 and 19 are recording and reproducing amplifier circuits connected to the line transformer 3, which amplify the response message and send it to the caller, as well as amplify the message from the caller. Reference numeral 20 denotes an endless response tape on which a response message is recorded.
A control signal called a beep tone that switches the TR relay is recorded, and the tape switch 2
A conductive foil 22 cooperating with 1 is provided. 23
is a response tape recording/playback magnetic head which records a response message on the response tape 20 and also plays back the message. Reference numeral 24 indicates a beep tone detection circuit that detects and amplifies the beep tone recorded on the response tape 20 when it is reproduced, and 25 indicates changeover switches 26 and 27 operated by the output of the beep tone detection circuit 24. This is a TR relay drive circuit that drives a TR relay (not shown) that switches the state to the opposite side and also switches the recording and reproducing amplifier circuits 18 and 19 from the reproducing state to the recording state. 28
a tape control circuit that generates a high level DC output when the tape switch 21 is in an open state;
Reference numeral 29 denotes a starting signal generating circuit which outputs a starting signal for a predetermined period of time when the output signal of the third station line control circuit 15 is applied. 30 is the response tape 2
The first motor control circuit controls the operation of the electric motor 31 that drives the drive transistor 32 and the operation of the drive transistor 32, and also controls the circuit necessary for the operation of the automatic answering machine after receiving a call. Power supply circuit 33 that supplies power
A power supply control transistor 34 that controls the operation of
It is composed of etc. The base of the power supply control transistor 34 is connected to the tape control circuit 28 and the activation signal generation circuit 29, and is configured such that its on/off operation is controlled by the output signal thereof. 35 is a recording tape on which a message from the caller is recorded; 36 is a magnetic head for recording and reproducing the recording tape that records the message on the recording tape 35 and also plays back the message; 37 is the recording tape. 35 is an electric motor that drives the TR relay drive circuit 25; 38 is the TR relay drive circuit 25;
A second electric motor control circuit is activated by the output signal of the electric motor 37 to control the operation of the electric motor 37. 39 is a central office line protection timer circuit that starts operating when an incoming call is received, and includes a resistor 40 and a capacitor 4.
1, and a diode 42 and a resistor 43 connected in parallel to the capacitor 41 and in series with each other to control the charging potential of the capacitor 41. Power is constantly supplied to the office line protection timer circuit 39 from the power supply circuit 8, and in a standby state, the charged potential of the capacitor 41 is set to a low level by a diode 42 and a resistor 43.
The connection point between the diode 42 and the resistor 43, that is, the cathode of the diode 42, is connected to the collector of the driving transistor 32 constituting the first motor control circuit 30 via a diode 44. Therefore, when the driving transistor 32 is conductive and drives the motor 31, the diode 44
A high voltage is applied to the cathode of the diode 42 through the diode 42 to reverse bias the diode 42, and charging of the capacitor 41, that is, a timer operation is started. The set time of the office line protection timer circuit 39 is set to be longer than the time required for the response tape 20 to go around once. Reference numeral 45 denotes a magnet ring which rotates in conjunction with the reel shaft 46 which rotates when the recording tape 35 is running, and has the function of opening and closing the switch 47. 48 is the switch 47
This is a rotation detection circuit that detects the rotational state of the reel shaft 46 by opening and closing of the switch 47, and generates an output signal in accordance with the opening and closing of the switch 47. 49 is a recording tape protection circuit that starts operating when the recording tape 35 starts running, and includes a time constant circuit consisting of a resistor 50 and a capacitor 51;
The diode 52 and the resistor 53 are connected in parallel to the capacitor 51 in order to control the charging potential of the capacitor 51, and are connected in series with each other. Power is constantly supplied to the recording tape protection circuit 49 from the power supply circuit 8, and in the standby state and response message sending state, the power is supplied to the recording tape protection circuit 49 through a diode 52 and a resistor 5.
3, the charging potential of the capacitor 51 is set to a low level. The diode 5
2 and the resistor 53, that is, the cathode of the diode 52, is connected to the output terminal of the second motor control circuit 38. Therefore, when the second motor control circuit 38 operates to drive the motor 37, a high voltage is applied to the cathode of the diode 52, and the diode 52 is reverse biased.
Charging of the capacitor 51 is started. However, the connection point between the capacitor 51 and the resistor 50 is connected to the rotation detection circuit 48, and while the reel shaft 46 is rotating, the charge in the capacitor 51 is discharged by the rotation detection circuit 48. The charging potential is configured not to rise above a predetermined level. 54 becomes an operating state when the charging potential of the capacitor 41 constituting the office line protection timer circuit 39 or the capacitor 51 constituting the recording tape protection circuit 49 exceeds a predetermined value, and maintains that state thereafter. This is a forced disconnection holding circuit, and its output terminal is connected to the base of the transistor 14 constituting the second station line control circuit 13 , the reset terminal 15a of the third station line control circuit 15, and the reset terminal 33a of the power supply circuit 33. ing. Reference numeral 55 denotes a tape end detection circuit for detecting that the recording tape 35 approaches the end based on a signal obtained from the rotation detection circuit 48, and 56 a tape end detection circuit 5.
This is a tape end detection/holding circuit which enters an operating state when an output signal is issued from 5 and maintains that state thereafter, and its output terminal is connected to the base of the transistor 14 constituting the second station line control circuit 13 . has been done. The operating point of the tape end detection circuit 55 is set at a point where the remaining amount of the recording tape 35 is slightly larger than the amount of tape required for one call controlled by the response tape 20. 57 oscillates when the recording operation is completed as the answering tape 20 goes around and when the connection with the telephone line is released due to the operation of the forced disconnection holding circuit 54;
This is a notification circuit that notifies the caller of the completion of the recording operation, etc. Reference numeral 58 denotes a DC erasing type magnetic head for erasing the signal recorded on the recording tape 35. When a message from a caller is recorded, a DC current is supplied through the switch 27 to perform the erasing operation, resulting in a high-speed erasing operation. At times, DC current is supplied via the high-speed erase switch 59 to perform an erase operation. A paytone detection and amplification circuit 60 detects and amplifies a paytone signal arriving from a telephone line, and has filter characteristics. 61 is a NAND circuit whose output terminal becomes L (low level) level when the amplified paytone signal is output from the paytone detection amplifier circuit 60; 62 is a NAND circuit whose output terminal becomes H level for a predetermined time when the signal level of the input terminal becomes L level; 63 is an inverting circuit that inverts the output signal of the control signal generating circuit 62. 64 is a paytone control transistor whose collector and emitter are connected between the signal path on the input side of the control signal generation circuit 62 and the ground, and its base is connected to the third station line control circuit through a capacitor 65 and a resistor 66. 15 output terminals. Therefore, the paytone control transistor 64 is inverted to the on state by the output signal of the third station line control circuit 15, and is inverted back to the off state when the capacitor 65 is completely charged. Reference numeral 67 denotes a paytone pause circuit which enters an operating state and maintains that state when the output signal of the third office line control circuit 15 is applied, and its output terminal is connected to the first motor control circuit 30 as shown in the figure. ing. That is, when the paytone pause circuit 67 is in operation, its output signal, which is an H level signal, is applied to the base of the driving transistor 32 through the diode 68, reverse biasing the transistor 32, and is applied through the resistor 69 and the diode 70. Diode 42 of the office line protection timer circuit 39
is applied to the cathode of the diode 42 to reverse bias the diode 42. 71 is the paytone pause circuit 67
This is a release transistor that returns the inverter to an inoperable state, and its base is connected to the output terminal of the inverter circuit 63 . 72 is the response tape 20
This circuit outputs an H level signal when the tape switch 21 is closed by the conductive foil 22, and outputs an L level signal when the tape switch 21 is opened. Reference numeral 73 designates an incoming call operation control transistor that controls the signal application operation to the LS relay circuit 16 and paytone pause circuit 67 of the third office line control circuit 15, and its base is connected to the output terminal of the conductive foil escape detection circuit 72. connected, the collector of which is a diode 74,7
5 to control signal paths 76, 77. Reference numeral 78 denotes a noise prevention transistor whose collector and emitter are connected between the signal path 79 of the recording and reproducing amplifier circuits 18 and 19 and the ground, and whose base is connected to the output terminal of the paytone pause circuit 67. When the paytone pause circuit 67 is in operation, it becomes conductive and serves to prevent noise from being transmitted to the caller. Although the present invention is configured as described above, the calling signal identification circuit 7 will be explained. If the calling signal arriving from the telephone line is an intermittent signal, an H level signal is output from output terminals 7a and 7b, and after a predetermined time, e.g. 10 seconds, the output signal of output terminal 7a is inverted to L level, and the calling signal is resumed. When the signal is a continuous signal, an H level signal is output from the output terminals 7a and 7b, and in this case, compared to the case of an intermittent signal, the output signal of the output terminal 7a is reversed to the L level after a short time, for example, 2 seconds. The calling signal identification circuit 7 is configured to do this. The present invention is constructed as described above, and its operation will be explained next. In the standby state, the tape switch 21 is closed by the conductive foil 22, and the switches 17, 26, 27, 59 are in the state shown. Further, since the transistor 12 constituting the first station line control circuit 9 is in an off state, the charging potential of the capacitor 11 is at a high level, and the transistor 14 constituting the second station line control circuit 13 is in an on state. Also, the release transistor 71 and the incoming call operation control transistor 73 are both in the on state, and the paytone control transistor 64 is in the off state. In such a standby state, when a calling signal arrives from the telephone line, the calling signal is sent to switch 17.
is led to the line transformer 2 through the amplifier circuit 4
is amplified by The call signal amplified by the amplifier circuit 4 is rectified by the rectifier circuit 5 and then applied to the bases of the transistors 6 and 12, turning the transistors 6 and 12 on and off. When the calling signal is an intermittent signal, the transistor 12 repeats on and off operations according to the signal cycle, but the charging time constant of the capacitor 11 is set to be larger than the off-operation time of the transistor 12 due to the calling signal. Furthermore, if the discharge time constant of the transistor 12 is set to be small, the charging potential of the capacitor 11 will not rise to a predetermined potential, that is, a potential that turns on the transistor 14 while the calling signal is arriving. . If the calling signal is an intermittent signal, as described above, an H level signal is output from the output terminals 7a and 7b of the calling signal identification circuit 7, and after a predetermined time, the output from the output terminal 7a becomes an L level. Therefore, when the signal at the output terminal 7a is at H level, the transistor 14 is in an on state, and the signal at the output terminal 7b is not applied to the third station line control circuit 15. and output terminal 7
When the signal a inverts to L level after a predetermined time,
Since the transistor 14, which was in the on state, is inverted to the off state, the H level signal at the output terminal 7b is applied to the third station line control circuit 15, and the third station line control circuit 15 is inverted to the operating state and remains in that state. hold. Further, when the calling signal is a continuous signal, the transistor 12 constituting the first station line control circuit 9 is in an on state, and the charging potential of the capacitor 11 does not rise to a predetermined potential. In this case, the output of the output terminal 7a becomes the L level a short time after the output terminals 7a and 7b of the calling signal identification circuit output the H level signal. Third station line control circuit 1
5, the third station line control circuit 15 inverts to the operating state and maintains that state. As described above, the operation of inverting the operating state of the third station line control circuit 15 according to the type of the calling signal is performed, and the subsequent operation will be explained next. When the third station line control circuit 15 becomes operational, an H level signal is output from its output terminal, but since the incoming call operation control transistor 73 is in the on state at this time, the H level signal is transmitted to the LS relay circuit 1.
6 and paytone pause circuit 67. The H level signal which is the output of the third station line control circuit 15 is applied to the activation signal generation circuit 29, and the activation signal generation circuit 29 causes the conductive foil 22 of the response tape 20 to escape from the tape switch 21 for a predetermined period of time. The H-level output signal of the activation signal generating circuit 29, which outputs an H-level signal for the time required for
4 is turned on. When the power supply control transistor 34 is turned on, the power supply circuit 33 becomes operational and the first motor control circuit 30
etc. starts power supply operation. When power is supplied to the first motor control circuit 30 , the driving transistor 32 is turned on and the motor 31 is rotated. When the electric motor 31 starts rotating, the response tape 20 starts running and the tape switch 2
1 is made open. As a result, an H level signal is output from the tape control circuit 28 and applied to the base of the power supply control transistor 34, and after the output signal from the activation signal generation circuit 29 disappears, the power supply control transistor 34 is The output signal from the tape control circuit 28 keeps it in the on state. Further, the output signal from the third office line control circuit 15 is applied to the base of the paytone pause control transistor 64 to turn the transistor 64 on for a predetermined period of time. As a result, the control signal generating circuit 62 is triggered by the control transistor 64 into an operating state, and outputs a high signal to its output terminal for a predetermined period of time, for example, 2 seconds.
Outputs a level signal. Since the H level signal is inverted by the inverting circuit 63 , the release transistor 71 which was in the on state is inverted to the off state. As described above, the third station line control circuit 1
When the tape switch 21 is opened, the conductive foil escape circuit 72 is activated and the incoming call operation control transistor 73, which was on, is turned off.
As a result, the output signal of the third station line control circuit 15 becomes LS
It will be applied to the relay circuit 16 and paytone pause circuit 67. When the LS relay circuit 16 is activated, the switch 17 is switched to close the telephone line, and when the paytone pause circuit 67 is activated, the H level signal output from the paytone pause circuit 67 is sent to the first motor control circuit. 30 and reverse biases the driving transistor 32, turning it off. Therefore, motor 31 stops rotating immediately after tape switch 21 is released. The incoming call operation according to the present invention is carried out as described above. Next, the operation depending on the presence or absence of a paytone signal will be explained. A case where the caller does not use a public telephone or a case where the paytone signal is shorter than the operation time of the control signal generation circuit 62 even if the caller uses a public telephone will be explained. In this case, the telephone line is closed by the above-mentioned operation and the response tape 20 stops running, but after a predetermined period of time, the output signal from the control signal generation circuit 62 becomes H.
The level is inverted to L level. As a result, the output level of the inversion circuit 63 becomes H level, turning on the release transistor 71 and resetting the paytone pause circuit 67. Therefore, the paytone pause circuit 67 is reversed to a non-operating state and the motor 31 is turned off.
starts rotating. Next, a case will be explained in which the caller uses a public telephone and the paytone signal is longer than the operating time of the control signal generation circuit 62.
In this case, after the connection with the telephone line is established, a paytone signal arrives from the telephone line, and the paytone signal is detected and amplified by the paytone detection and amplification circuit 60. The signal amplified to H level by the detection amplifier circuit 60 is turned to L level by the NAND circuit 61.
The level can be reversed. As a result, the control signal generation circuit 62 continues to be triggered while the paytone signal continues to arrive, and the control signal generation circuit 62 outputs an H level signal. Therefore, during that time, the release transistor 71 is in an off state, and the response tape 20 is in a stopped state. When the paytone signal from the telephone line disappears, the canceling transistor 71 is turned on, resetting the paytone pause circuit 67, and the response tape 20 starts running as described above. Note that when the response tape 20 is stopped by the paytone pause circuit 67, the noise prevention transistor 78 is turned on by the output of the paytone pause circuit 67, so that induced noise etc. are amplified for recording and playback. It is not amplified by circuits 18 and 19 and sent to the caller. After the above operations are performed, the response tape 20 starts running. When the response tape 20 starts running, the response message recorded on the tape 20 is transferred to the response tape recording/playback magnetic head 23. After being reproduced, it is sent to the caller via the switch 26, the recording and reproduction amplifier circuits 18 and 19, and the line transformer 3. After the response message is sent to the caller, the beep tone signal recorded on the response tape 20 is played back, and when the beep tone signal is detected by the beep tone detection circuit 24, the TR relay drive circuit 25 operates and switches 26, 27 to the opposite side from the illustrated state, and the recording and reproducing amplifier circuits 18 and 19 are also switched from the reproducing state to the recording state. At the same time, the second motor control circuit 38 becomes operational and rotates the motor 37 to run the recording tape 35. Therefore, the message from the caller is sent to line transformer 3.
- Recording/playback amplifier circuit 18, 19 - Switch 26
Magnetic head 3 for recording and playback of recording tape through
6 and is recorded on the recording tape 35. In this state, the message from the caller is recorded on the recording tape 35, but in this recording state, the response tape 20 goes around once and the tape switch 2 is turned off.
1 is closed by the conductive foil 22, the output of the tape control circuit 28 becomes L level and the output of the conductive foil escape detection circuit 72 becomes H level. As a result, the power supply control transistor 34 is reversed from the on state to the off state, and the power supply circuit 33 is brought into a non-operating state and no power supply operation is performed. Therefore, both the electric motors 31 and 37 stop rotating, and the response tape 20 stops with the conductive foil 22 closing the tape switch 21. Further, since the output of the conductive foil escape detection circuit 72 becomes H level, the incoming operation control transistor 73 is turned on, and the LS relay circuit 16 is inverted and returned to the non-operating state. This restoration of the LS relay circuit 16 releases the connection with the telephone line, but
At this time, the notification circuit 57 operates to notify the caller that the recording operation has been completed. After such an operation is performed, the automatic answering machine returns to the standby state. Further, by returning to the standby state, the third station line control circuit 15 is inverted and returned to the non-operating state. Next, when the caller uses a public telephone to make a call, what happens when a paytone signal, which is a toll reminder, arrives from the telephone line while the caller is sending a response message or recording the caller's message. I will explain about it. The length of the paytone signal that arrives in this case is shorter than the paytone signal that arrives at the time of arrival, and shorter than the operating time of the control signal generation circuit 62. When a paytone signal arrives while the automatic answering machine is operating, the paytone signal is detected and amplified by the paytone detection and amplification circuit 60 and triggers the control signal generation circuit 62 as described above. As a result, the control signal generating circuit 62 is inverted to the operating state for a predetermined time and then returns to the non-operating state. Therefore, the response tape 20 stops running for a predetermined period of time and then starts running again every time a paytone signal arrives. As is clear from the above explanation, when an incoming call operation is performed, the running of the response tape 20 is temporarily stopped regardless of the presence or absence of a paytone signal, and if the paytone signal is longer than a predetermined time, a paytone signal has arrived. The running of the response tape 20 is stopped for a predetermined period of time, and when a paytone signal arrives during operation, the response tape 20 is stopped for a predetermined time, so that the response message recorded on the response tape 20 by the paytone signal is The message is not masked and the caller can clearly hear the response message. Next, the operation of the office line protection timer circuit 39 will be explained. In the standby state, the charging potential of the capacitor 41 is maintained at a low potential by the diode 42 and the resistor 43. When an incoming call is performed and the first motor control circuit 30 becomes operational, a high voltage is applied to the cathode of the diode 42 through the driving transistor 32 and the diode 44, and the diode 42 is reverse biased. As a result, the capacitor 41 is charged through the resistor 40, and the station line protection timer circuit 39 starts its timer operation. Further, when a paytone signal arrives or for a predetermined period of time immediately after an incoming call operation, the drive transistor 32 constituting the first motor control circuit 30 is turned off due to the operation of the paytone pause circuit 67, and the motor 31 is brought into a stopped state. In this state, the output signal of the paytone pause circuit 67 is applied to the cathode of the diode 42 through the diode 70, and the diode 42 is maintained in a reverse bias state, so that the station line protection timer circuit 39 is not reset and operates as a timer. maintain. Since the set time of the station line protection timer circuit 39 is set to be longer than the time required for the response tape 20 to go around once, during normal operation, the tape does not reach a predetermined value until the charging potential of the capacitor 41 reaches a predetermined value. The switch 21 is closed and the automatic answering machine returns to the standby state by the operation described above. As a result, the reverse bias voltage applied to the diode 42 disappears, the charge in the capacitor 41 is discharged through the diode 42 and the resistor 43, and the station line protection timer circuit 39 is reset to its initial state. Next, an explanation will be given of the operation when an accident such as cutting or wrapping of the response tape 20 or a faulty contact of the tape switch 21 occurs. When such an accident occurs, the telephone line is not disconnected by one rotation of the answering tape 20, but the office line protection timer circuit 39 is also not reset. Therefore, the station line protection timer circuit 39
The charging potential of the capacitor 41 that constitutes the capacitor 41 gradually rises, and after a predetermined period of time, the capacitor 41
The charging potential reaches a predetermined potential, and its output signal is applied to the forced disconnection holding circuit 54, which inverts to the operating state and maintains that state. As a result, the output signal of the forced disconnection holding circuit 54 is transmitted to the third station line control circuit 15 and the power supply circuit 33.
The signal is applied to the reset terminals 15a and 33a of the circuit and the base of the transistor 14 constituting the second station line control circuit 13 . Therefore, both the third office line control circuit 15 and the power supply circuit 33 are reversed from the operating state to the non-operating state, and the telephone line is forcibly disconnected. Further, since the transistor 14 constituting the second office line control circuit 13 is kept in an on state from now on, even if a calling signal arrives, the automatic answering machine will not operate. As described above, the operation is performed when an accident occurs in the response tape 20.Next, we will explain the operation when an accident occurs in the paytone pause circuit system and the response tape 20 is held in a stopped state. . In such a state, the output signal of the paytone pause circuit 67 reverse biases the diode 42 constituting the office line protection timer circuit 39 , so the office line protection timer circuit 39 performs a timer operation and performs a predetermined timing. After a period of time has elapsed, the forced disconnection holding circuit 54 is inverted to the operating state. Therefore, the same operation as in the case where an accident occurs in the response tape 20 is performed, and the connection with the telephone line is released, and it becomes impossible to receive calls from now on. Next, the operation when an accident such as cutting or winding of the recording tape 35 occurs will be explained. While the recording tape 35 is running, that is, while a message from the caller is being recorded, the diode 52 constituting the recording tape protection circuit 49 is in a reverse bias state, and the capacitor 51 is charged, but the recording tape 35 is not running. Since the reel shaft 46 is rotating during this period, its charging potential does not rise to a predetermined voltage. That is, as the magnet ring 45 rotates as the reel shaft 46 rotates, the switch 47 repeats opening and closing, and the opening and closing of the switch 47 activates the rotation detection circuit 48, which protects the recording tape. The charging and discharging of the capacitor 51 of 49 is controlled to prevent its charging potential from rising to a predetermined voltage. The above-described operation is performed when the recording tape 35 is running normally, but the operation when an accident occurs in the recording tape 35 will be described next. When an accident occurs, the reel shaft 46 stops rotating, and as a result, the switch 47 cannot be opened or closed by the magnet ring 45. Therefore, the rotation detection circuit 48 becomes inactive, the discharging action of the capacitor 51 stops, and the capacitor 51 is only charged. Then, after a predetermined period of time has elapsed, the capacitor 51
The charging potential rises to a predetermined voltage, and the forced disconnection holding circuit 54 is inverted to the operating state. When the forced disconnection holding circuit 54 is reversed to the operating state, the same operation as in the case where an accident occurs in the answering tape 20 is performed, and the connection with the telephone line is released, and the state becomes impossible to receive calls from now on. As described above, a protective operation is performed in the event that an accident such as cutting occurs to the response tape 20 and the recording tape 35, but if the response operation is performed normally and the remaining amount of the recording tape 35 becomes low, The operation will be explained. When messages from callers are recorded one after another and the remaining amount of recording tape 35 becomes slightly longer than one call, the tape end detection circuit 5
5 operates to invert the tape end detection/holding circuit 56 to the operating state, and at the same time, the detection/holding circuit 56 maintains the operating state. As a result, the output signal of the tape end detection holding circuit 56 is transmitted to the second station line control circuit 1.
3 to the base of transistor 14 to keep transistor 14 in the on state. When the recording of the message from the caller on the recording tape 35 is completed, the automatic answering machine returns to the standby state, but after this operation, the transistor 14 is activated by the tape end detection holding circuit 56. Therefore, since it is kept in the on state, even if a paging signal arrives thereafter, the third office line control circuit 15 will not operate, and no incoming call operation will be performed. Note that the forced disconnection holding circuit 54 is activated by the output signals of the office line protection timer circuit 39 and the recording tape protection circuit 49 , and when the telephone line is forcibly disconnected, the notification circuit 57 is activated. A notification sound is sent to the caller. While a message from a caller is being recorded on the recording tape 35, current from the power supply circuit 33 is supplied to the DC erase type magnetic head 58 through the switch 27 and the diode 80, and the magnetic head 58 performs an erase operation. . Further, during the high-speed erasing operation, the recording tape 35 is rapidly forwarded by the high-speed erasing operation, and the high-speed erasing switch 5 is
9 is closed and the switch 59 and diode 81
A current is supplied from the power supply circuit 8 to the DC erase type magnetic head 58 through the DC erase type magnetic head 58, and the magnetic head 58 performs an erase operation for high speed erase. As explained above, the present invention uses the paytone pause circuit to stop the running of the answering tape for a predetermined time not only when the telephone line is closed but also when a paytone signal arrives, so that the caller can The response message can be clearly heard without being masked by the paytone signal. Furthermore, the present invention uses a paytone pause circuit to start a timer operation when the motor control circuit enters an operating state due to the arrival of a calling signal, and to replace the office line protection timer circuit which is in a timer operating state when the motor control circuit is in an operating state. Since the timer operation state is maintained by the output signal of the paytone pause circuit even when the motor control circuit is in an inactive state, the advantage is that the station line protection operation can be carried out at an accurate time in the event of an accident. Therefore, the utility value of the present invention is extremely high.

[Brief explanation of the drawing]

The illustrated circuit is one embodiment of the automatic answering machine of the present invention. Explanation of main drawing numbers, 2, 3...Line transformer,
7... Calling signal identification circuit, 8... Constant power supply circuit, 9 ... First station line control circuit, 13 ... Second station line control circuit, 15... Third station line control circuit, 16...
...LS relay circuit, 18, 19...Amplifying circuit for recording and playback, 20...Response tape, 21...Tape switch, 22...Conductive foil, 23...Magnetic head for recording and playback for response tape, 24... Beep tone detection circuit, 25...TR relay drive circuit, 28
...tape control circuit, 29 ... starting signal generation circuit, 30 ... first motor control circuit, 31, 37...
...Electric motor, 32...Drive transistor, 33
... Power supply circuit, 34 ... Power supply control transistor, 35 ... Recording tape, 36 ... Magnetic head for recording and playback of recording tape, 38 ... Second motor control circuit, 39 ... Station line protection timer Circuit, 45... Magnet ring, 48... Rotation detection circuit, 49 ... Recording tape protection circuit, 54...
... Forced cutting holding circuit, 55 ... Tape end detection circuit, 56 ... Tape end detection holding circuit, 57
...Notification circuit, 59...High-speed erasing switch, 6
0... Paytone detection amplification circuit, 62... Control signal generation circuit, 63 ... Inversion circuit, 64... Paytone control transistor, 67... Paytone pause circuit, 71... Cancellation transistor, 72
. . . Conductive foil escape detection circuit, 73 . . . Incoming operation control transistor, 78 . . . Noise prevention transistor.

Claims (1)

[Claims] 1. In response to a ringing signal coming from a telephone line, a call receiving operation is performed and a response message recorded on an answering tape is sent to the caller, and the answering operation time is regulated by the running time of the answering tape. The automatic answering machine is configured to include a motor control circuit that drives a motor that becomes operational upon arrival of a ringing signal and causes the answering tape to run; a paytone pause circuit that operates when a telephone line is closed or when a paytone signal arrives and stops the running of the response tape for a predetermined time; and a timer operation that starts when the electric control circuit becomes operational due to the arrival of a calling signal. When the electric motor control circuit is in the operating state, the station line protection timer circuit is in the timer operating state and the timer time is set to be longer than the response operation time regulated by the response tape; When a signal is output from the central office line protection timer circuit, it is inverted to the operating state and disconnects from the telephone line and disables further incoming calls. Automatic answering machine, characterized in that when the answering tape is stopped due to non-operation of the motor control circuit, the paytone pause circuit maintains the office line protection timer circuit in the timer operating state. Device.