JP2536990Y2 - Internal / external line switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an internal / external line switch, and particularly to an internal / external line switch that does not require an external telephone.

(Prior Art) An example of a conventional internal / external line switch will be described with reference to FIG.

In the figure, K1 to K4 are relays, 1 and 2 are ring (RING) detection circuits also serving as off-hook (OFF-HOOK) detection, and 3 is a 24V (volt) power supply circuit. Relay K1 connects the external telephone line and the internal telephone line to relay K3. Relay K2 connects the external telephone line and the internal telephone line to an external telephone. Relay K3 connects the facsimile communication line and relay K4 to relay K1. Relay K4 is 24V with relay K3.
The power supply circuit 3 is connected to the built-in telephone.

Next, the operation of the conventional device will be described with reference to FIG.

When waiting for an outgoing or incoming call, that is, when idling (R1), relays K1 and K4 are on (ON), K3 is off (OFF), and relay K2 is connected to the extension ( R2). That is, they are connected as shown in FIG.

At this time, if there is an incoming call from the external telephone line (R3), the ring detecting circuit 2 detects this. This detection signal is sent to a control circuit (not shown), and the control circuit switches the relays K1 and K3 to the ON side, K4 to the OFF side, and switches the relay K2 to the extension side (R4). Therefore, an incoming call from the external telephone line is connected to the facsimile communication line via the relays K1 and K3. At this time, the extension telephone line and the external telephone are connected via the relay K2, and a call can be made between the two.
The same connection as described above is made when a call is made to an external telephone line from, for example, a facsimile machine.

When a call is received from an extension telephone line or a call is transmitted to an extension telephone line (R5), the relays K1 and K4 are switched off, K3 is switched on, and K2 is switched to an external line (R6). Therefore, an incoming call from the extension telephone line is connected to the facsimile communication line via the relays K1 and K3. At this time, the external telephone line and the external telephone are connected via the relay K2, and a call can be made between the two. The same connection as described above is made when a call is made from the facsimile apparatus to an external telephone line.

In the connection state shown in FIG. 4, when a call is received from the internal telephone line (R7) while the internal telephone is talking with a telephone connected to the external telephone line (hereinafter referred to as an external telephone) (R7), the control circuit is activated. , The connection in the idling state is maintained. That is, the relays K1 and K4 are turned on, K3 is turned off, and K2 maintains the connection on the extension side (R8). This is because, when an incoming call from an extension is accepted, the call of the built-in telephone is cut off. The ring detection circuit 1 of the external telephone detects that there is an incoming call from the extension, and the ringing bell continues to ring.
The operator can know this (R9).

If an incoming call arrives on an external line during an extension call using an external telephone, relays K1 and K3 are turned on, K4 is turned off, and K2 is connected to the extension side (R11). Therefore, it is possible to connect the incoming call from the external telephone line to the facsimile communication line while holding the extension call.

(Problems to be Solved by the Invention) In the above-described conventional internal / external line switch, as shown in R3 and R4, when the user wants to talk with the internal line while receiving an external line, or in R5 and R6 As described above, an external telephone is always required when a call is made to an external line during an extension incoming call. Therefore, an external telephone and a relay for switching the telephone to an internal / external telephone line are required, and there are problems that the number of parts is large and that equipment costs are high.

Also, as shown in R7 to R9, if there is an incoming call from the internal telephone line while making an external call using the built-in telephone, this incoming call is not connected to the facsimile communication line, The problem was that he just kept ringing the bell.

An object of the present invention is to eliminate the above-mentioned problems of the conventional device, and to make a call to an extension (or an outside line) while receiving an outside line (or an extension) without using an external telephone, each call is made. It is an object of the present invention to provide an internal / external line switch capable of receiving an incoming call at an extension during an external line call.

(Means and Actions for Solving the Problems) In order to achieve the above object, the present invention provides a first relay for switching between an external telephone line and an internal telephone line, and switching between an external telephone line and an internal telephone line. Or a second relay for connecting an extension telephone line to a fourth relay and a first ring detection circuit, which will be described later, and a third relay for switching a signal from the first relay to a facsimile communication line and a second ring detection circuit. And a fourth relay for switching between the telephone line and the ring signal generator selected by the second relay and connecting one of them to the built-in telephone. Connected to the facsimile communication line, and connected to an external or internal telephone line and the built-in telephone, and there is an incoming or outgoing call during an internal or external call using the internal telephone. Connected, the outside or extension telephone line is connected to the facsimile communication line, and at times other than call reservation, the telephone line selected by the second relay is connected to the built-in telephone. The ring signal generator is connected to the built-in telephone, and the first to fourth relays are switched so as to connect the telephone line selected by the second relay and the built-in telephone when the built-in telephone is off-hook. And a control circuit for performing such control.

According to the present invention, at the time of an outgoing / incoming call from an outside line,
Is turned on, and the second relay is connected to the extension side, so that facsimile communication using an external telephone line and communication with an extension telephone using the built-in telephone can be performed at the same time.

In the case of an extension call, the first relay is off and the third relay is off.
Is turned on, and the second relay is connected to the outside line, so that facsimile communication using the extension telephone line and communication with the outside line telephone using the built-in telephone can be performed at the same time.

When an incoming call is received at an extension or a call is transmitted from an extension during an external call, the first relay is off, the third relay is on, and the second relay is connected to the outside line.
Facsimile communication can be performed via an extension telephone line while continuing a call with an external telephone.

When there is an incoming call to an outside line or a call is made from an outside line during an extension call, the first and third relays are turned on, and the second relay is connected to the extension side. While continuing, facsimile communication can be performed via an external telephone line.

When making a call reservation, the fourth relay connects the ring signal generator to the built-in telephone, and connects the built-in telephone to the facsimile apparatus when the built-in telephone is off-hook, so that the telephone call can be reserved.

Hereinafter, the present invention will be described in detail with reference to the drawings.

 FIG. 1 shows a circuit diagram of an embodiment of the present invention.

In the figure, K1, K2, and K3 are relays, 11 is a first ring detection circuit also serving as off-hook detection of a built-in telephone, 12 is a second ring detection circuit, 13 is a control circuit (CPU), and 14 is an extension button. .

This embodiment has only a built-in telephone and no external telephone.

Next, the operation of this embodiment will be described with reference to FIG.

When waiting for transmission or reception, that is, when idling (S1), relays K1 and K3 are connected to the off (OFF) side, and relay K2 is connected to the outside line (S2). That is, they are connected as shown in FIG.

When there is an incoming call from an external telephone line (S3), the first ring detection circuit 11 detects this. This detection signal is sent to the control circuit
Sent to 13. Then, the control circuit 13 outputs a relay control signal to K1, K2, and K3. As a result, the relays K1 and K3 are switched on (ON), and the relay K2 is switched to the extension (S4).

With the above operation, incoming calls from external telephone lines are relayed.
It is connected to a facsimile communication line via K1 and K3.
In addition, the extension telephone line and the built-in telephone are connected via the relay K2, and it is possible to make a call with the extension telephone using the built-in telephone.

The same connection as described above is made when a call is made to an external telephone line from, for example, a facsimile machine.

When an incoming call is received from the extension telephone line (S5), the second ring detection circuit 12 detects this. This detection signal is sent to the control circuit 13. The control circuit 13 outputs the relay control signal to K1,
Output to K2 and K3, switch relay K1 off, switch K3 on, and switch K2 to outside line (S6). Therefore, an incoming call from the extension telephone line is connected to the facsimile communication line via the relays K1 and K3.

At this time, the external telephone line and the built-in telephone are connected via the relay K2, and a call can be made from the built-in telephone to the external telephone.

When a call is made from the facsimile apparatus to the extension telephone line, the same connection as described above is made.

In the connection state of FIG. 1, when a call is received from an extension telephone line while talking with an external telephone using the built-in telephone (S7), the second ring detection circuit 12 detects this. Then, the control circuit outputs a relay control signal to K1 to K3, and turns off the relay K1, turns on K3, and switches K2 to the outside line (S8).

As a result, if there is an incoming call from the extension telephone line while talking with the outside line telephone using the built-in telephone, the extension telephone line can be connected to the facsimile communication line while the call is continued. For this reason, it is possible to simultaneously make a call with an external telephone and an incoming call from an internal telephone line.

During an extension call, that is, when the relay K2 is connected to the extension side and K1 is connected to ON and there is an incoming call from an external telephone line (S9), the relay K3 is turned ON (S10).

As a result, if there is an incoming call from an external telephone line while talking with the extension telephone using the built-in telephone, the external telephone line can be connected to the facsimile communication line while the call is continued. For this reason, a telephone call with an extension telephone and an incoming call from an external telephone line can be simultaneously performed.

As described above, according to the present embodiment, it is possible to make a call with an extension (or an outside line) telephone while making or receiving an outside line (or an extension) simply by using the built-in telephone. Also, if there is an incoming call or outgoing call from an extension (or an outside line) during a call with an outside line (or an outside line) phone, the incoming call or outgoing call can be accepted while continuing the call.

FIG. 3 shows a second embodiment of the present invention. This figure shows the main part of this embodiment, and the parts not shown are the same as those in FIG.

In FIG. 3, reference numeral 15 denotes a ring signal generator,
The same reference numerals as those in the drawings denote the same items.

This embodiment is obtained by adding a call reservation circuit to the first embodiment.

When the call reservation is made, the control circuit 13 connects the relay K4 to the off side. When the communication by the facsimile apparatus ends, the control circuit 13 activates the ring signal generator 15. Then, a ring signal is sent from the ring signal generator 15 to the built-in telephone, and the bell of the built-in telephone rings.

Then, when the operator lifts the handset, the relay K4
Is switched on, and you can talk to the other party.

(Effects of the Invention) As is apparent from the above description, according to the present invention, the facsimile apparatus receives or transmits an image signal through an internal or external telephone line without using an external telephone, and uses the built-in telephone. There is an effect that it is possible to talk with a telephone connected to an unused telephone line.

Conversely, when a call for facsimile communication is made through an extension or an external telephone line while a call is made to an external line or an extension telephone with the built-in telephone, the call can be accepted without interruption or stoppage. There is an effect that can be. Further, according to the present invention, when a call reservation is made during facsimile communication, there is an effect that this can be appropriately executed.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of one embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation of the present embodiment, FIG. 3 is a circuit diagram of a main part of a second embodiment of the present invention, and FIG. FIG. 5 is an explanatory diagram of the operation of the conventional device. K1 to K3 …… Relay, 11, 12 …… Ring detection circuit, 13 ……
Control circuit, 14 ... Extension buttons.

Claims (1)

(57) [Scope of request for utility model registration] A first relay for switching between an external telephone line and an internal telephone line, a fourth relay and a first ring detecting circuit for switching between the external telephone line and an internal telephone line, and connecting the external or internal telephone line to the external telephone line and the internal telephone line. A second relay connected to the first relay, a third relay for switching a signal from the first relay to a facsimile communication line and a second ring detection circuit, and a telephone line and a ring signal selected by the second relay. A fourth relay for switching between the generator and one of them to a built-in telephone; connecting to an internal or external telephone circuit and the facsimile communication line when an internal / external line is transmitted / received; A telephone is connected to the external or internal telephone line and the facsimile communication line when an external or internal call is received during an internal or external telephone call using the built-in telephone. Connect to the phone and use the second
The telephone line selected by the relay is connected to the built-in telephone. At the time of call reservation, the ring signal generator is connected to the built-in telephone. When the built-in telephone is off-hook selected by the second relay. An internal / external line switch, comprising: a control circuit for controlling switching of the first to fourth relays so as to connect a telephone line and the built-in telephone.