JP3060565B2 - Facsimile machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile apparatus equipped with a telephone, and more particularly, to a facsimile apparatus in which the electric insulation strength between the main body of the facsimile apparatus and the attached telephone is improved.

[0002]

2. Description of the Related Art In a facsimile apparatus to which an attached telephone is connected, in a case where the facsimile side of the telephone line for one called communication is to be switched to the attached telephone side while maintaining the loop state of the telephone line, (A) In some cases, a buzzer built in the main body of the facsimile apparatus sounds to instruct the operator to take the handset of the attached telephone. (B) a facsimile apparatus body provided with a call signal generating section for generating a call signal for ringing the bell of the attached telephone, and a loop current detecting section for detecting a hook-up state of the attached telephone; There is a facsimile apparatus configured to supply a ringing signal for ringing a bell of an attached telephone and a loop current for detecting a hookup state of the attached telephone to the attached telephone.

[0003]

However, according to the conventional facsimile apparatus of (A), the buzzer
However, there is a problem in that it is inconvenient because only an operator who knows the meaning of the above can switch to the attached telephone. Also,
Since there is no electrical hook-up detector for the handset hook-up, the operator picks up the handset and then presses a predetermined button on the facsimile machine, etc. There was a problem that the telephone line had to be switched. Further, in this case, when the facsimile apparatus main body and the attached telephone are installed at a remote place, the operator needs to move the facsimile apparatus main body and the attached telephone between a few places.
There was also a problem that it had to go back and forth, which was inconvenient.

According to the conventional facsimile apparatus of (B), the problem of the facsimile apparatus of (A) can be solved, but the telephone line and the dangerous voltage section and the telephone line and the user-accessible section can be solved. When sufficient electrical insulation is required, if the ringing signal is set to a voltage that reaches the dangerous voltage due to the ringing of the bell of the attached telephone, the parts that ensure insulation between the dangerous voltage part and the telephone line are the contacts of the line relay. At the same time, there was a problem that sufficient electrical insulation could not be secured. Further, even if the ringing signal does not reach the dangerous voltage, the low voltage circuit including the ringing signal generating section and the loop current supply section is connected to a metal frame which is usually a user-accessible section. Therefore, the electrical insulation between the telephone line side and the user-accessible portion is provided between the contacts of the switch element such as a relay, and there is a problem that sufficient electrical insulation cannot be secured. . Therefore, there is a problem that the device cannot be used when a high electric strength is required.

The present invention has been made in view of the above,
It is an object of the present invention to provide a facsimile apparatus in which electrical insulation between a facsimile apparatus main body side and a telephone line side is sufficiently ensured, and switching between the facsimile apparatus and an attached telephone can be performed by a simple operation.

[0006]

SUMMARY OF THE INVENTION A facsimile apparatus according to the present invention comprises a telephone line switching section for selectively connecting a telephone line to a facsimile apparatus main body and an auxiliary telephone, and a call signal for ringing a bell of the auxiliary telephone. A ringing signal generator for generating, a ringing signal transmission transformer for transmitting a ringing signal output from the ringing signal generator to an attached telephone, a detector for detecting a ringing signal, and a telephone line connected to the facsimile apparatus body. When the calling signal generator is driven from the time of calling the called operator in the state of being turned on, the off-hook of the attached telephone handset is determined according to the detection output of the detector while the calling signal generator is being driven, and the off-hook is determined. A control unit for stopping driving of the call signal generation unit and switching the telephone line switching unit to the attached telephone side.

[0007]

In the facsimile apparatus of the present invention, the call signal generator is driven when the called operator is called while the telephone line is connected to the main body of the facsimile apparatus. As a result, the ringing signal from the ringing signal generator is supplied to the auxiliary telephone via the ringing signal transmission transformer, the bell of the auxiliary telephone is sounded, and the operator is informed that the handset of the auxiliary telephone is lifted. When the handset of the attached telephone is hooked off-hook, the impedance of the attached telephone decreases and the detection unit cannot detect the calling signal. However, the control unit determines that the hook is off-hook because the detection unit does not generate a detection output despite driving the call signal generation unit, stops driving the call signal generation unit, and sets the telephone line switching unit to the attached telephone. Switch to the side. Therefore, the telephone line and the attached telephone are connected, and the called operator can talk through the attached telephone.

Therefore, unlike the conventional case, the loop current is not supplied from the loop current supply unit and the loop current detection unit detects the loop current to determine the off-hook. The current supply section is unnecessary, and the ringing signal output from the ringing signal generation section can be transmitted to the attached telephone via the ringing signal transmission transformer, and the ringing signal transmission transformer acts as an isolation transformer, Isolation is performed between the line and the dangerous voltage section, and between the telephone line and the user-accessible section, so that even if a high withstand voltage is required, it can be handled.

[0009]

The present invention will be described below with reference to examples. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, showing an attached telephone calling circuit. For convenience, a portion of the facsimile device that is connected to the telephone line in a DC manner is referred to as a line side, and the other portion is referred to as a facsimile device body side. The adjunct telephone calling circuit is included in the network control unit (NCU). A telephone line is connected to the line connection terminal 1, and an auxiliary telephone 12 is connected to the auxiliary telephone connection terminal 11. The line connection terminal 1 is connected to a line relay-2 for selectively connecting a telephone line to the facsimile apparatus body and the telephone under the control of the control unit 10. A modem 4 is connected via a line transformer 3 to a terminal M of the main body side of the line relay-2. A signal from the modem 4 is supplied to the control unit 10 so that the control unit 10 determines whether or not the signal from the modem 4 is a signal for calling the called operator.

A call signal detecting unit 5 is connected to the terminal B of the line relay-2 on the attached telephone side, and an attached telephone 12 is connected via a loop current detecting unit 6. Further, a paging signal generating section 8 and a paging signal connection relay 9 driven by the output of the control section 10 which has determined that the output from the modem 4 is a signal for paging the called operator are provided. The ringing signal output from the unit 8 is supplied to the attached telephone 12 through the ringing signal transmission transformer 7 and the ringing signal connection relay 9. Further, a paging signal detection output output from the paging signal detection section 5 and a loop current detection output output from the loop current detection section 6 are supplied to a control section 10. In response to the detection output, the loop current detection output, and the output from the modem 4, the presence / absence of a paging signal detection output, the presence / absence of a loop current detection output, switching control of the line relay-2, the generation of a paging signal In addition to the drive control of the section 8 and the drive control of the call signal connection relay 9, data processing with the modem 4 and control of the entire facsimile apparatus are performed.

Since the attached telephone calling circuit in the facsimile apparatus of the present embodiment constructed as described above is included in the network controller, the basic operation of the network controller will be described first. The line relay-2 is normally connected to the terminal B on the attached telephone. When the attached telephone 12 is off-hook in this state, a loop current flows, and the loop current is detected by the loop current detection unit 6. Therefore, the control unit 10 detects that the handset of the attached telephone 12 is hooked up. Is detected. When the facsimile apparatus is set to the automatic reception mode, the call signal input from the telephone line is detected by the call signal detection section 5, and the control section 10 determines that the call signal has been input. The control unit 10 that has determined that the call signal has been input switches the line relay-2 to the terminal M on the facsimile apparatus main body side and performs facsimile reception. This is the basic operation of the network control device.

Next, the operation of the attached telephone calling circuit in this embodiment will be described. It is assumed that the facsimile apparatus body is set to the automatic reception mode and that an incoming call is received. Since the line relay-2 is normally connected to the terminal B on the attached telephone, the call signal input from the telephone line is detected by the call signal detecting section 5, and the output of the call signal detection is sent to the control section 10. The control unit 10 having received the paging signal detection output connects the line relay-2 to the facsimile apparatus main body side terminal M. Therefore, the telephone line
It is connected to the modem 4 via the line relay-2 and the line transformer 3 to enable normal facsimile communication. In this state, if there is a request to call the called-side operator to the attached telephone 12, for example, in the case of a so-called conversation reservation during which the user wants to talk with the receiving-side operator during the reception of the original or after the end of the reception of all the originals, In the case of facsimile / telephone (F / T) switching for calling the called operator when the calling side is not facsimile communication, the calling signal connection relay 9 is closed and the calling signal is controlled under the control of the control unit 10. The generator 8 is driven.

By this driving, a calling signal is output from the calling signal generating section 8. The output ringing signal is supplied to the auxiliary telephone 12 via the ringing transmission transformer 7 and the ringing signal connection relay 9, and the bell of the auxiliary telephone 12 is caused to ring. On the other hand, the paging signal output from the paging signal generator 8 is also applied to the paging signal detector 5. However, while the bell of the attached telephone 12 is ringing, the ringing signal is detected by the ringing signal detecting section 5 because the impedance of the attached telephone 12 is high. The control unit 10 that has received the detection output does not determine that the handset of the attached telephone 12 has been off-hook. In this state, the attached telephone 12
When the handset goes off-hook, the attached telephone 12
A loop is formed therein, and the impedance of the attached telephone 12 is reduced. For this reason, the voltage of the paging signal applied to the paging signal detection unit 5 decreases, and the paging signal detection unit 5 cannot detect the paging signal, and the paging signal detection output disappears.

By the disappearance of the paging signal detection output, the control unit 10 outputs the paging signal,
Since the ringing signal detection output is not input, it is determined that the handset of the attached telephone 12 is off-hook.
By this determination, the control unit 10 makes the call signal generation unit 8
Is stopped, the contact of the calling signal connection relay 9 is opened, and the line relay 2 is connected to the terminal B on the attached telephone. As a result, the telephone line is connected to the attached telephone 12, and the called operator can talk over the telephone line.

Here, since the control unit 10 controls generation and stop of the call signal from the call signal generation unit 8, the characteristics of the call signal transmission transformer 7 satisfy the communication standard with respect to the telephone line. If it does, the call signal connection relay 9 can be omitted. Further, it is technically possible to detect a ringing signal in the loop current detecting section 6, and the loop current detecting section 6 can also serve as the ringing signal detecting section 5. This does not mean that detection is not necessary.

FIG. 2 is a block diagram showing the configuration of the conventional example shown in FIG. 2B. In this conventional example, the normal line relay-2 is switched to the attached telephone, and the handset of the attached telephone 12 is off-hook. Then, a loop current flows, which is detected by the loop current detector 6 and indicates that the hook is off-hook. However, in the case of F / T switching, when there is an incoming call, the line relay-2 is switched to the facsimile apparatus main body side. If the called party is not a facsimile, the bell of the attached telephone is sounded to call the operator. Even if the operator raises the handset, the line relay-2 is switched to the facsimile apparatus main body side. Even if the line is off-hook, the line current does not flow to the attached telephone 12 and the loop current detector 6 turns off the line. Not detectable. For this purpose, a call signal is sent to the attached telephone 12 from a state where the line relay-2 is connected to the terminal M on the facsimile apparatus body side, and after detecting hookup of the attached telephone 12, the line relay-2 is connected to the attached telephone side. Since an operation for switching to the terminal B is required, the loop current supply unit 27 and the ringing signal generating unit 8 are connected via the ringing signal connection relay 9 to enable off-hook detection.

Therefore, in the conventional example shown in FIG. 2, when the line relay-2 is connected to the facsimile apparatus main body side terminal M and the operator wants to ring the bell of the attached telephone 12 to call the operator, the control unit 10A is operated. After closing the paging signal connection relay 9 by control, the paging signal generation section 8
Generates a calling signal, and supplies a loop current from the loop current supply unit 27. As a result, the bell of the attached telephone 12 rings, and when the handset of the attached telephone 12 is hooked up, a loop is formed, the loop current is detected by the loop current detecting unit 6, and the control unit 10A is attached. It is determined that the handset of the telephone 12 has been hooked up.
Subsequent to this determination, the control unit 10A releases the paging signal connection relay 9 and stops the generation of the paging signal output from the paging signal generation unit 8, and sets the line relay-2 to the facsimile apparatus body terminal M From the attached telephone terminal B
Switch to As a result, the telephone line is switched from the facsimile apparatus body to the attached telephone.

In the conventional example shown in FIG. 2, even if the ringing signal generated by the ringing signal generator 8 is less than the dangerous voltage specified by the safety standard, the loop current supply unit 27 or the ringing signal generator is used. 8 is connected to the user-accessible part, it is necessary to provide a sufficient electrical insulation specified by the safety standard, and a considerably high voltage, for example, 1.5 kV, as a withstand voltage between the contacts of the call signal connection relay 9. However, there is no general switch element having such a large dielectric strength between the contacts, and even if it exists as a special part, it is impractical to use it in a facsimile machine. Is as described above. However, in the present invention, the off-hook of the attached telephone handset is determined according to the detection output of the ringing signal detecting unit 5 while the ringing signal generating unit 8 is being driven as in the embodiment, so that the loop current supply unit 27 is unnecessary. When the call signal is transmitted to the attached telephone 12 by the call signal transmitting transformer 7, the call signal transmitting transformer 7 acts as an insulating transformer, and is connected between the telephone line and the dangerous voltage section, and between the telephone line and the dangerous line. Isolation from the user-accessible portion is performed, so that even if a high withstand voltage is required, it can sufficiently cope with it.

[0019]

As described above, according to the present invention, the ringing signal output from the ringing signal generator for generating the ringing signal for ringing the bell of the telephone is transmitted to the telephone via the ringing signal transmission transformer. In the state where the telephone line is connected to the main body of the facsimile apparatus, the call signal generator is driven from the time of detection of the call signal for calling the called operator, and the off-hook of the attached telephone handset is driven while the call signal generator is being driven. The determination is made in accordance with the detection output of the detection unit, and when the off-hook is determined, the drive of the call signal generation unit is stopped and the telephone line switching unit is switched to the attached telephone side, so that the called side operator of the attached telephone sets It is possible to talk to the caller via the attached telephone by off-hook the attached telephone handset when the bell rings. Come, the operation has the effect of a simple.

Since the loop current is not supplied from the loop current supply unit and the loop current is detected by the loop current detection unit to determine the off-hook as in the related art,
The call current supply unit is unnecessary, and the call signal output from the call signal generation unit can be transmitted to the attached telephone via the call signal transmission transformer, and the call signal transmission transformer acts as an isolation transformer, The hook-up of the handset switches to the attached phone almost simultaneously with the hook-up of the handset, while ensuring sufficient electrical insulation between the telephone line and the hazardous voltage section and between the telephone line and the user-accessible section, requiring a high withstand voltage. There is an effect that can be dealt with even if it is done.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional example.

[Explanation of symbols]

 2 Line Relay 3 Line Transformer 4 Modem 5 Ring Signal Detector 6 Loop Current Detector 7 Ring Signal Transmission Transformer 8 Ring Signal Generator 9 Ring Signal Connection Relay 10 Control Unit 12 Attached Telephone

Claims (1)

(57) [Claims] 1. A telephone line switching section for selectively connecting a telephone line to a facsimile apparatus main body and an auxiliary telephone, a call signal generating section for generating a call signal for ringing a bell of the auxiliary telephone, and a call signal generating. A call signal transmission transformer for transmitting the call signal output from the telephone unit to the attached telephone, a detection unit for detecting the call signal, and calling the called-side operator while the telephone line is connected to the facsimile apparatus body. The call signal generator is driven from time to time, and the off-hook of the attached telephone handset is determined according to the detection output of the detector while the call signal generator is being driven. When the off-hook is determined, the drive of the call signal generator is stopped and the telephone is stopped. A facsimile apparatus comprising: a control unit that switches a line switching unit to an attached telephone.