JPH04132359A - Switching circuit for telephone set and facsimile terminal equipment - Google Patents

Abstract

PURPOSE:To prevent the generation of a malfunction at set to a facsimile terminal equipment based on a hooking signal by temporarily operating the double connection of the telephone set with a line at the time of the telephone set is off-hooked at the time of incoming. CONSTITUTION:When the hook switch of a telephone set 7a is operated, and a switch 4 is instantaneously turned into an off, the telephone set 7a is kept connected through a relay 5 with the line, and a direct current loop is kept closed. Therefore, the hit state of the direct current loop is generated, and it is possible to prevent the generation of a problem that a switchboard side misunderstands this, and judges that a party to be called cuts the line. Thus, the generation of the malfunction can be prevented at the time of operating the switchover from the telephone set into the facsimile terminal equipment based on the hooking signal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a switching circuit for a telephone and a facsimile device, which is effective for switching from a telephone mode to a facsimile mode in a facsimile device that is shared with a telephone.

[Conventional technology]

In the past, facsimile machines were often connected to a telephone line, such as a subscriber's telephone line, alternatively, and were used preferentially to the telephone set.

In this case, the lines can be switched manually by the operator, or by having the facsimile machine equipped with automatic sending and receiving functions so that when a call is made or received, the line is automatically switched from the telephone to the facsimile machine. There is a system configured to switch to

Since there are various problems in manual operation by the performer, the latter automatic switching method is often used, and an example thereof is disclosed in Japanese Patent Laid-Open No. 62-226767.

This method consists of a means for detecting a specific hooking signal generated by a hooking operation of the telephone when the telephone is connected to a communication partner terminal via a line in a facsimile machine, and a control means that mainly switches the line. The control means switches the line from the telephone to the facsimile when the detection means detects the above-mentioned specific hooking signal.

[Problem to be Solved by the Invention 1] In the prior art, when the detection means detects a specific hooking signal, the line is switched from the telephone side to the facsimile machine side. In this case, there is a problem in that a momentary interruption of the DC loop occurs, and the exchange side misrecognizes this and concludes that the called side has disconnected the line. This will be explained in more detail below with reference to FIG.

In the apparatus shown in FIG. 3, a telephone 7 is connected to a communication partner terminal via a line L1 and a facsimile machine. Initially, the relay 14 for switching between the telephone 7 and the facsimile device is connected to the telephone 7 side.

When there is an incoming call, it is detected by the ringing detection circuit 6, and the incoming call is notified by a bell or the like. Operator is on phone 7
When the user picks up the handset (off-hook) and recognizes that the call is to a facsimile machine, the user performs a hooking operation. The instantaneous interruption of the DC loop caused by this hooking operation is detected by the hook detection circuit (1) 3,
The relay 11 for creating a DC loop on the facsimile machine side is turned on, and the relay 14 is disconnected from the telephone set 7 side, thereby completing switching of the line from the telephone set to the facsimile machine.

In the end, in the above-mentioned conventional technology, it was not possible to avoid instantaneous interruption of the DC loop caused by the hooking operation, which caused the malfunction mentioned in mJ. This problem also occurs when switching the line from the telephone 7 to the facsimile machine using a DP (dial pulse) signal instead of a ringing signal.

The present invention has been made in view of the above circumstances, and its purpose is to solve the above-mentioned problems in the conventional technology, and to prevent malfunctions even when switching from a telephone to a facsimile machine based on a hooking signal. An object of the present invention is to provide a switching circuit between a telephone and a facsimile machine, which prevents the occurrence of this problem.

[Means for Solving the Problems] The above-mentioned object of the present invention is to provide a telephone with an external component, a means for detecting on-hook and off-hook states of the telephone, and a means for detecting a ringing signal. In the facsimile machine, the external connection is provided with one stage for directly connecting and controlling the @talk line to the telephone, and the external connection from the detection means is based on an off-hook detection signal of the telephone; 6;
The external device listed in j connects and controls the telephone line directly to the telephone f.
Temporary external connection with the switch on is achieved by a switching circuit for the telephone and facsimile machine, characterized in that it has means for making a double connection of the same line as the telephone.

[Function] In the switching circuit between a telephone and a facsimile device according to the present invention, when a call is received and the telephone is off-hook, the telephone and the line are temporarily connected to each other, so that an off-hook operation by the operator is performed. Even if there was
Since the occurrence of 1lJ1 disconnection in the DC loop has been eliminated, malfunctions will not occur even when switching from a telephone to a facsimile machine based on a hooking signal.

[Example 1] Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 shows one embodiment of the present invention? l! FIG. 2 is a configuration diagram of a switching circuit between a telephone and a facsimile device. In the figure,
Symbol 1 is a relay that switches between telephone 7a (without foot switch r9) and facsimile machine & machine by means of (]ISt~ control signals, which will be described later), 2 is an isolation transformer from l111, and 3 is the same hook detection as mentioned above. Circuit (1), 4
Reference numeral 5 indicates a switch operated by the handset on/off operation of the telephone 7a, and reference numeral 5 indicates a control relay 6 disposed in parallel with the contacts of the switch 4, which indicates the ringing detection circuit described above. Note that the broken lines drawn on relays 1 and 5 and switch 4 indicate that a plurality of contacts are switched at the same time.

Incidentally, the relay 1 is initially set in a position where it is connected to the telephone set 78 as shown in the figure, and the switch 4 is also closed. Further, the contacts of relay 5 are open.

Below, the operation of the switching circuit of the telephone and facsimile machine according to this embodiment configured as described above is shown in FIG.
The explanation will be based on the automatic switching control flow by the control section.

The control section monitors the ringing signal (step 21), and if a ringing signal is detected, the control section moves to the off-hook monitoring of the telephone 7a by the operator (step 22). When the telephone 7a is off-hook by the operator, the operation signal SW2 for closing the above-mentioned relay 5 is turned on (step 23). In this state, telephone 7a is connected to the line via switch 4 and relay 5.

If the incoming call is not to a telephone but to a facsimile machine, the operator operates a hook switch to switch the connection to the facsimile machine, and the operation is as follows.

The control unit monitors whether the telephone 7a is on-hook by the operator (step 24), and if there is on-hook, it turns off the operation signal SW2 and switches the relay l to the facsimile machine side. Turn on the operation signal 01-ISW (step 25
). In addition, at this time, the telephone 7a by the operator
Switch 4 is turned off by operating the hook switch of
Telephone 7a is now connected to the line only via relay 5.

At the same time, by turning off other contacts in synchronization with this, a signal HOOK2 indicating on-hook is sent to the facsimile machine side.

The control section sets a monitoring timer based on the signal HOOK2 (step 26), and moves on to monitoring facsimile control signals (for example, CNG, DC3, etc.) (step 27). If the facsimile control signal mentioned above is received,
Shifts to normal facsimile reception operation (step 30)
). There is no need to specifically explain this detail, so it will be omitted.

On the other hand, if the line is busy (step 28), or
If the above monitoring timer times out,
The control unit turns off the operation signal 0H3W for switching the relay 1 to the facsimile machine side (step 29).
). This disconnects the line and returns to the initial state.

According to the above embodiment, even if the operator operates the hook switch of the telephone 7a and turns off the switch 4 momentarily, the telephone 7a remains connected to the line via the relay 5, and the DC loop Since the line remains closed, a momentary interruption of the DC loop occurs, which causes the problem that the exchange side misrecognizes this and concludes that the called side has disconnected the line. Things will disappear.

As a result, the telephone is used with priority, and when a signal indicating a telephone hooking operation by the operator is detected, the line can be switched and connected from the telephone to the facsimile machine without any hindrance. .

It should be noted that the embodiment described above is an example of the present invention, and it goes without saying that the present invention should not be limited thereto.

【Effect of the invention〕

As explained in detail above, according to the present invention, when a call is received and the telephone is off-hook, the operator performs an off-hook operation by temporarily making a double connection between the telephone and the line. By eliminating the occurrence of instantaneous interruptions in the DC loop, it is possible to create a switching circuit between a telephone and a facsimile machine that does not malfunction even when switching from a telephone to a facsimile machine based on a hooking signal. This has a remarkable effect.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a switching circuit for a telephone and facsimile machine showing an embodiment of the present invention, FIG. 2 is a flowchart showing its operation, and FIG. 3 is a block diagram showing an example of a conventional switching circuit. 1: Telephone and facsimile device switching relay 2: Isolation transformer, 3: Off-hook detection circuit, 4: A telephone that does not include a switch, relay, or switch operated by the handset on/off operation of the telephone. Figure 7a゛Footsuit

Claims (1)

[Claims] (1) An external telephone and an on-hook of the external telephone;
In a facsimile apparatus with an external telephone set having an off-hook state detecting means and a ringing signal detecting means, a means for directly connecting and controlling a telephone line to the external telephone set is provided, and a means for directly connecting and controlling a telephone line to the external telephone set is provided, so that the external telephone set is not detected by the detecting means. A telephone and facsimile apparatus characterized in that the telephone and facsimile apparatus have means for temporarily connecting the external telephone and the line by turning on a means for controlling the connection of a direct telephone line to the external telephone based on an off-hook detection signal. switching circuit.