JPH089959Y2 - Fax machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of use] The present invention relates to a facsimile apparatus with a telephone, and to a circuit capable of detecting a hook state of the telephone.

[Conventional technology]

Conventionally, when a telephone and a facsimile machine are shared by a single telephone line, they have been used in a connection as shown in FIG. In the figure, a telephone line 1 is connected to a relay 2 of a facsimile machine 3. One end of the relay 2 is connected to the facsimile device 3 and the other end is connected to the telephone 7. When the facsimile device 3 is connected to the telephone line 1, the circuit of the telephone 7 is in an open state, and it is impossible to determine whether the hook switch 8 of the telephone 7 is on or off. Therefore, in the case of a facsimile machine with a telephone, if the telephone line is connected to the facsimile machine 3, the following functions cannot be used.

A. On-hook dialing: Dial with the phone in place.

B. Hold: Send the melody etc. to the other party while the phone is on and have them wait.

C. Conversation reservation: Call the other party after fax communication.

I cannot use the telephone function such as. Now, when making an on-hook dial, the following procedure is necessary. First, press the on-hook button. This operation is a manual switching signal 6
Enters the CPU 4, and the switching signal 5 between the facsimile device 3 and the telephone 7 switches the relay 2 from the telephone side to the facsimile side. If the telephone line is already connected to the side of the facsimile, it remains as it is. After that,
The dial pulse is transmitted from the circuit of the facsimile device 3. Since line 1 is connected and the other party comes out and hears the other party's voice from the speaker, pick up the handset of the telephone, turn on the hook switch, and press the on-hook button to switch the relay from the facsimile machine side to the telephone side. Allows you to talk to the other party. As described above, the operation is complicated and time-consuming.

[Problems to be solved by the device]

The present invention has been made in view of the above-mentioned problems of the conventional technology. When the telephone line is connected to the facsimile apparatus, the hook switch of the telephone goes off hook, that is, the hook switch is turned on. To detect. A circuit for automatically switching the relay from the facsimile machine side to the telephone side is provided.

[Means for solving the problem]

In order to achieve the above object, one of the telephone lines is connected to the moving piece of the first relay circuit and the other is connected to the moving piece of the second relay circuit, and the first contact of the first relay circuit is connected to the hook switch of the telephone. The second contact is connected to one of the inputs of the facsimile machine, the third contact of the second relay circuit is connected to the other of the hook switch via the circuit of the telephone, and the fourth contact is connected to the other input of the facsimile machine. In the connected facsimile machine, a second hook switch interlocking with the hook switch of the telephone is provided, and one of the second hook switches is connected to one of the secondary side terminals of the transformer via the light emitting element, and the secondary side terminal of the transformer is connected. The other is connected to the other of the second hook switches, an AC signal power source is connected to the primary side of the transformer, and one of the light receiving elements arranged facing the light emitting element is a resistor. While grounding the other to power through, there is provided a facsimile apparatus the output end of the light receiving element is connected to the driving portion of the first and second relay circuits.

[Action]

According to the above configuration, when the telephone is not connected to the telephone line, the hook-on / off detection unit added to the telephone circuit causes the relay to send a discrimination signal from the facsimile machine side to the telephone side when the telephone is off-hook. Automatically switch to.

〔Example〕

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a circuit diagram of an essential part showing an embodiment of a facsimile device according to the present invention, FIG. 2 is a waveform diagram of the circuit of the facsimile device, and those having the same functions as those in FIG. The description is omitted.

In the figure, reference numeral 1 is a telephone line, which is connected to a facsimile device 3 and a telephone 7 via a relay 2. Reference numeral 9 denotes a telephone circuit, which constitutes a telephone including the hook switch 8. Reference numeral 13 is a transformer, an AC signal power source 14 is connected to the primary side, one terminal on the secondary side is a second hook switch 10 and the other terminal is a light emitting diode (hereinafter referred to as LED) 11 via a second hook switch. Connected to 10. Reference numeral 11 is an LED, which is optically coupled to the phototransistor 12. Reference numeral 12 is a phototransistor, which is connected to the CPU 4 and whose output is transmitted to the CPU 4 to control the relay 2.

In the above configuration, when the hook switch 8 of the telephone 7 is off (the handset is set in the telephone), no current flows in the second hook switch 10 (mechanically linked to the hook switch 8). Since the phototransistor 12 does not operate, there is no input signal to the CPU4 and the output of the CPU4 does not change. That is, the relay is not switched from the facsimile machine 3 to the telephone 7. Then, when the second hook switch 10 of the telephone 7 is turned on, the control unit 15 operates. The signal voltage 20 of the AC signal power supply 14 excites the primary side of the transistor and induces a similar signal voltage on the secondary side.
This induced voltage supplies the signal voltage 21 to the LED 11 and a current flows through the LED 11. Then, the LED 11 emits light and the phototransistor 12
Turn on. At this time, the output voltage 22 of the phototransistor 12
Changes from + B voltage (high level) to 0V (low level). The change value of this photo transistor 12 is transmitted to the CPU 4 as the detection signal (FAX / TEL automatic switching signal) 17 and the CPU
The relay 2 is switched from the facsimile to the telephone as the FAX / TEL switching signal 5 from 4.

[Effect of device]

As described above, in the present invention, when the on-hook dialing is performed, the facsimile device and the telephone are manually switched. However, this operation can be automatically performed, and the operation is simplified. . Further, by using the photocoupler and the transformer, it is possible to sufficiently secure the withstand voltage between the primary and secondary of the telephone line standard.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an essential part showing an embodiment of a facsimile machine according to the present invention, FIG. 2 is a waveform diagram of a circuit of the facsimile machine, and FIG. 3 is a schematic configuration diagram showing a conventional example. In the figure, 1 is a line, 2 is a relay, 3 is a facsimile machine,
4 CPU, 5 FAX / TEL switching signal, 7 telephone, 8 hook switch, 9 telephone circuit, 10 second hook switch, 11 LED, 12 photo transistor, 13 transformer, 14 AC signal A power supply, 15 is a control unit, 17 is an automatic switching signal, 20 is a voltage waveform of an AC signal power supply, 21 is a voltage waveform during LED operation, and 22 is a voltage waveform of a phototransistor.

Claims (1)

[Scope of utility model registration request] 1. One of the telephone lines is connected to the moving piece of the first relay circuit and the other is connected to the moving piece of the second relay circuit, and the first contact of the first relay circuit is connected to one of the hook switches of the telephone. A facsimile in which the second contact is connected to one of the inputs of the facsimile device, the third contact of the second relay circuit is connected to the other of the hook switch via the circuit of the telephone, and the fourth contact is connected to the other input of the facsimile device. In the device, a second hook switch interlocking with a hook switch of the telephone is provided, one of the second hook switches is connected to one of the secondary side terminals of the transformer via a light emitting element, and the other of the secondary side terminals of the transformer is An AC signal power source is connected to the other side of the second hook switch, the primary side of the transformer is connected, and one of the light receiving elements arranged to face the light emitting element is used as a power source via a resistor. Write with grounding the facsimile apparatus the output end of the light receiving element is connected to the driving portion of the first and second relay circuits.