JPH089958Y2 - 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, the following functions cannot be used if the telephone line is connected to the facsimile machine.

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 CPU4 and the switching signal 5 between the facsimile machine and the telephone
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. Then, the dial pulse is transmitted from the circuit of the facsimile apparatus. Since the line is connected and the other party comes out and the other party's voice is heard from the speaker, pick up the handset of the telephone to turn on the hook switch and press the on-hook button to switch the relay from the facsimile machine side to the telephone side. You can 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 conventional problems,
When the telephone line is connected to the facsimile apparatus, it is detected that the hook switch of the telephone goes off-hook, that is, the hook switch is turned on. 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. On the other hand, in a facsimile device 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 of the telephone, and the fourth contact is connected to the other input of the facsimile device, One side of the telephone line is connected to the first contact, and the third contact is connected to one end of the light emitting element through a resistor, the other end of the light emitting element is connected to the fourth contact, and the light emitting element is arranged facing the light emitting element. (EN) A facsimile machine in which one of the installed light receiving elements is connected to a power source and the other is grounded, and the output terminals of the light receiving elements are connected to the drive parts 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 schematic circuit diagram showing an embodiment according to the present invention. Those having the same functions as those in FIG. 2 are denoted by the same reference numerals and detailed description thereof will be omitted.

In the figure, 1 is a telephone line (NTT telephone line), which is connected to a FAX (facsimile device) 3 and a TEL (telephone) 7 via a relay 2. Reference numerals 11 and 13 denote light emitting diodes (hereinafter referred to as LEDs), which are optically coupled to phototransistors 12 and 14, respectively. A load resistor 15 is connected to the power supply and the phototransistors 12 and 14. 16 is a high resistance for current limitation, which minutely suppresses the current supplied from the telephone line 1. The outputs of the phototransistors 12 and 14 are transmitted to the CPU 4 and control the relay 2.

In the above configuration, when the relay 2 is connected to the side of the facsimile device 3 and the hook switch 8 of the telephone 7 is open (the handset is set in the telephone), no current flows through the LEDs 11 and 13 and the photo Transistor 12
And 14 do not work. When the hook switch 8 of the telephone 7 is turned on, the LEDs 11 and 13 are closed by the hook switch 8 of the telephone 7 circuit. Due to the closed circuit, a current flows through the LED 13 when the circuit of the telephone 7 has a positive voltage, and a current flows through the LED 11 when the circuit has a negative voltage.
In both cases of positive and negative voltages, the phototransistors 12 and 14 operate and output as a detection signal. This detection signal is FAX /
Enter the CPU4 as the TEL automatic switching signal 17 and fax / T
The relay 2 is switched as the EL switching signal 5.

[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 a photo coupler or the like, it is possible to sufficiently secure the dielectric strength between the primary and secondary of the telephone line standard.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a main part of an embodiment of a facsimile apparatus according to the present invention, and FIG. 2 is a schematic configuration diagram showing a conventional embodiment. In the figure, 1 is a telephone line, 2 is a relay device, 3 is a facsimile device, 4 is a CPU, 5 is a FAX / TEL switching signal, 6 is a manual switching signal, 7 is a telephone, 8 is a hook switch, 10 is a detection unit, 11 is a light emitting diode, 12 is a phototransistor, 13
Is a light emitting diode, 14 is a phototransistor, 15 and 16 are resistors, and 17 is an automatic switching signal.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 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. In a facsimile device 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 of the telephone, and the fourth contact is connected to the other input of the facsimile device, One side is connected to the first contact point, the third contact point is connected to one end of the light emitting element through a resistor, the other end of the light emitting element is connected to the fourth contact point, and the light emitting element is arranged to face the light emitting element. A facsimile apparatus in which one of the light receiving elements is connected to a power source and the other is grounded, and the output terminals of the light receiving elements are connected to the driving units of the first and second relay circuits.