JPS6119146B2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a telephone transfer device.

(Prior Art) Conventionally, a system is known in which, when the office 1 is away, calls made to the office 1 from the calling telephone A are transferred to the forwarding destination telephone D via the telephone transfer device 3. It is.

To explain this with reference to FIGS. 1 and 2, when a call is placed from the calling telephone A to the receiving telephone B, the incoming call signal detector 13 of the telephone transfer device 3 detects this,
The calling side holding switch 12' of the calling telephone line 5' is closed and the holding resistor 19' holds the calling telephone line 5' so that it can send and receive calls. Send your phone number. When the transfer destination telephone device D picks up the handset in response to this (off-hook), the response detector 15 detects this and the message tone generator 16
, and sends a signal tone or voice for several seconds to the transfer destination telephone device D to notify that the call is a transfer call. When the operation of the message tone generator 16 is completed, the receiving side holding switch 12 is closed and the holding resistor 19 holds the telephone line of the receiving telephone B, and the contacts 17 and 17 of the coupling switch 4 are closed to connect the receiving telephone line. 5 and the originating telephone line 5', and the telephone A and the forwarding destination telephone D are connected to the telephone transfer machine 3.
You can make direct calls via the connection.

In addition to the above-mentioned known method, Japanese Patent Application Laid-Open No. 109314/1983 is known, which discloses the holding resistor 19,
19', trunks are used to connect the two telephone lines to maintain good impedance matching and reduce signal transmission loss.

(Problems to be Solved by the Invention) A common problem in the above-mentioned known examples is that the receiving side holding switch 12 (numerals 1 and 3 in the above-mentioned known publication) is connected to the message tone generator 16 (notification sound control circuit 9). Since the call is closed after the operation of
It takes a considerable amount of time for the caller to connect with the incoming phone B, and the call may be mistakenly recognized as being away and the call may be hung up. To overcome this, the called side holding switch 12
It is sufficient to close the message tone generator 16 at the same time as the message tone generator 16 is activated.
In the case of Publication No. 109314, the message is sent from the calling telephone A.
There was a drawback that it leaked to the sides.

(Means for Solving the Problem) Therefore, the present invention provides an incoming telephone set B and a calling telephone set C.
an incoming signal detector 13 that is connected between the incoming telephone device B and detects the arrival of a calling signal to the incoming telephone device B; and a dial that calls the forwarding destination telephone device D via the outgoing telephone line 5' of the outgoing telephone device C. a signal generator 14; a response detector 15 for detecting off-hook of the transfer destination telephone D; a message tone generator 16 for notifying the transfer destination telephone D that the call is a transfer call; and the message tone generator. When 16 is activated, the called side holding switch 12 holds the incoming telephone line 5 of the incoming telephone set B so that it can transmit and receive calls, and when the incoming signal detector 13 is activated, it holds the outgoing telephone line 5' of the outgoing telephone set C. A caller-side holding switch 12' that maintains the ability to send and receive calls, and a coupling switch 4 that connects the incoming telephone line 5 and the outgoing telephone line 5' when the message tone generator 16 has finished operating are provided. The telephone line 5 is connected to the outer winding of the coupling transformer 22 via the called side holding switch 12, and the outgoing telephone line 5' is connected to the outer winding of the coupling transformer 22' via the calling side holding switch 12'. and a telephone transfer device in which the inner winding of the coupling transformer 22 and the inner winding of the coupling transformer 22' are connected via the coupling switch 4; an incoming signal detector 13 connected between the incoming telephone device B to detect the arrival of a calling signal to the incoming telephone device B; and a dialing signal generator for calling the forwarding destination telephone device D via the outgoing telephone line 5' of the incoming telephone device C. a response detector 15 for detecting off-hook of the forwarding destination telephone device D; a message tone generator 16 for notifying the forwarding destination telephone device D that the call is a forwarding call; When activated, the incoming side holding switch 12 holds the incoming telephone line 5 of the incoming telephone set B so that it can transmit and receive calls, and when the incoming signal detector 13 is activated, it transmits the outgoing telephone line 5' of the outgoing telephone set C. Switch 1 for holding the calling side so that it can receive calls
2', and a coupling switch 4 for coupling the incoming telephone line to the outgoing telephone line 5' when the message tone generator 16 has finished operating; the incoming telephone line 5 is coupled via the coupling switch 4. The incoming side holding switch 12 is connected to the incoming telephone line 5 via the holding resistor 19 to form a DC loop, and the outgoing telephone line 5' is connected to the incoming side winding of the transformer 20. It has the configuration of a telephone transfer device connected to the calling side winding of a coupling transformer 20 via a holding switch 12'.

(First Embodiment) The first embodiment of the present invention will be described with reference to FIG. is connected via the receiving side holding switch 12, and the outgoing telephone line 5' of the calling telephone C is connected to the outer winding of the coupling transformer 22' via the calling side holding switch 12'. The inner winding of the coupling transformer 22' and the inner winding of the coupling transformer 22' are connected to each other via contacts 17, 17 of the coupling switch 4. As a result, the conventional holding resistors 19, 19'
(See Figure 2) The pure resistance of the transformer winding can be used as a holding resistance for the incoming telephone line 5 and the outgoing telephone line 5', and the combined impedance of the lines can be matched. There is also little transmission loss.

13 is connected to the incoming telephone line 5, and the incoming telephone set B
An incoming call signal detector 15 is connected to the outgoing telephone line 5' and is a response detector which detects when the transfer destination telephone D goes off-hook.

Therefore, the coupling transformer 22' has a winding 21
A dial signal generator 14 and a message tone generator 16 are connected to the winding 21, and the winding 2
1, the signal is sent from the originating telephone line 5' to the destination telephone D.

(Second example) Next, the second embodiment shown in FIG. 4 will be explained.

In the second embodiment, the incoming telephone line 5 is connected to the coupling transformer 20 via the contacts 17, 17 of the coupling switch 4.
Connect to the receiving side winding of the receiving side and switch 1 for holding the receiving side.
2 is a holding resistor 1 without using the coupling switch 4.
9 to the incoming telephone line 5, and a DC loop is formed on the incoming telephone line 5 by the incoming side holding switch 12 and the holding resistor 19. The originating telephone line 5' is connected to the originating side winding of the coupling transformer 20 via the originating side holding switch 12'. In this case, the receiving side holding switch 12 is closed only while the message tone generator 16 is in operation to hold the incoming telephone line 5 by the holding resistor 19, and is opened when the message tone generator 16 has finished operating. The incoming telephone line 5 is connected to the coupling transformer 2.
It is maintained so that it can communicate by the transmitter winding of 0.

(effect) Next, we will discuss the effect.

Explaining through the first example and the second example,
When a call is placed from calling telephone A to receiving telephone B,
The incoming signal detector 13 detects this signal, closes the calling side holding switch 12' of the outgoing telephone line 5' to hold the outgoing telephone line 5' so that it can send and receive calls, and transmits it by the dial signal generator 14. The telephone number of the destination telephone device D is sent and the transfer destination telephone device D is called. When the handset of the transfer destination phone D is picked up and the response detector 15 detects this, the message tone generator 16 is activated to send a signal tone or voice to the transfer destination phone D for several seconds, and the transfer is completed. Tell them it's a phone call.

At this time, in the first embodiment shown in FIG. 3, at the same time as the message tone generator 16 is activated, the incoming side disconnection switch 12 is closed, and the incoming telephone line 5 is held by the outer winding of the coupling transformer 22 so as to be able to talk. Then, calling telephone A and receiving telephone B are connected. Therefore, the calling telephone set A is immediately connected to the receiving telephone set B, and there is no possibility that the calling telephone set B will be mistakenly recognized as being out of the office.
Since lines 7 and 17 are open, no message tone is sent to the calling telephone A side.

When the operation of the message tone generator 16 is completed, the coupling switch 4 is closed, and the incoming telephone line 5 and the outgoing telephone line 5' are coupled with impedance matching, and the calling telephone A is connected without any transmission loss. and the transfer destination telephone D are connected to enable communication.

In addition, in the second embodiment, the receiving side holding switch 12 is closed at the same time as the message tone generator 16 is activated, and the receiving telephone line 5 is temporarily held so as to be able to make a call by the holding resistor 19. The telephone A and the receiving telephone B are connected. For this reason,
The calling telephone A is immediately connected to the receiving telephone B, so that it will not be mistaken as being out of the office, and when sending a message tone, the contacts 17, 17 of the coupling switch 4
is open, so no message tone is sent to the calling telephone A side.

When the operation of the message tone generator 16 is completed, the coupling switch 4 is closed, and at the same time, the receiving side holding switch 12 is opened, and the receiving telephone line 5 is enabled to make a call through the receiving side winding of the coupling transformer 20. In addition, the incoming telephone line 5 and the outgoing telephone line 5' are coupled with impedance matching, and the calling telephone A and the transfer destination telephone D are connected for communication without transmission loss.

(Effect) As mentioned above, conventionally, when office 1 is away,
A system is known in which a call made to the office 1 from telephone A is transferred to a destination telephone D via a telephone transfer device 3. In addition, the holding resistor 1
It is also known that a transformer is used instead of 9 and 19' to connect two telephone lines to maintain good impedance matching and reduce signal transmission loss. However, a common problem with the known examples is that the receiving side holding switch 12 is closed after the message tone generator has finished operating.
It takes a considerable amount of time to establish a connection between the calling telephone A and the receiving telephone B, and the call may be hung up due to a misunderstanding that the caller is not home.

However, the present invention provides an incoming call signal detector 13 that is connected between an incoming telephone set B and a calling telephone set C to detect the arrival of a calling signal to the incoming telephone set B, and A dial signal generator 14 that calls the forwarding destination telephone D via the line 5', a response detector 15 that detects the off-hook of the forwarding destination telephone D, and a dial signal generator 15 that detects the off-hook of the forwarding destination telephone D, and informs the forwarding destination telephone D that the call is a forwarded call. a message tone generator 16 for notifying;
When the message tone generator 16 is activated, the receiving side holding switch 12 holds the incoming telephone line 5 of the incoming telephone B so that it can transmit and receive calls, and when the incoming signal detector 13 is activated, the calling telephone C makes a call. A calling side holding switch 12' that holds the telephone line 5' so that it can transmit and receive calls;
and the outgoing telephone line 5'.
The incoming telephone line 5 is connected to the outer winding of the coupling transformer 22 via the called side holding switch 12, and the outgoing telephone line 5' is connected to the coupling transformer via the calling side holding switch 12'. a telephone transfer device connected to the outer winding of the coupling transformer 22', and connecting the inner winding of the coupling transformer 22 and the inner winding of the coupling transformer 22' via the coupling switch 4;
and an incoming call signal detector 13 connected between the incoming telephone set B and the outgoing telephone set C to detect the arrival of a calling signal to the incoming telephone set B, and the outgoing telephone set C.
a dial signal generator 14 for calling the transfer destination telephone D via the originating telephone line 5'; a response detector 15 for detecting off-hook of the transfer destination telephone D;
A message tone generator 16 notifies the forwarding destination telephone device D that the call is a forwarding call, and when the message tone generator 16 is activated, the receiving telephone device B
a receiving side holding switch 12 that maintains the receiving telephone line 5 so that it can transmit and receive calls; and the receiving signal detector 13.
When activated, the calling side holding switch 12' holds the calling telephone line 5' of the calling telephone C so that it can transmit and receive calls, and when the message tone generator 16 ends its operation, it connects the receiving telephone line 5 and the calling telephone line. 5' is provided, and a coupling switch 4 is provided,
The incoming telephone line 5 is connected to the incoming winding of the coupling transformer 20 via the coupling switch 4, and the incoming side holding switch 12 is connected to the incoming telephone line 5 via a holding resistor 19 to provide direct current. Since a loop is formed and the calling telephone line 5' is connected to the calling side winding of the coupling transformer 20 via the calling side holding switch 12', the call is Telephone A is immediately connected to incoming telephone B, which prevents the telephone from being mistakenly recognized as being out of the office.Furthermore, the impedance matching is good and there is little transmission loss.

[Brief explanation of the drawing]

FIG. 1 is a block diagram, FIG. 2 is a circuit diagram of a conventional example, FIG. 3 is a circuit diagram of a first embodiment, and FIG. 4 is a circuit diagram of a second embodiment. Explanation of symbols 1... Office, 2... Local office, 3... Transfer destination, 4... Combined switch, 5...
Incoming telephone line, 5'...Outgoing telephone line, 11,1
1'...terminal, 12...received side holding switch,
12'... Calling side holding switch, 13... Incoming signal detector, 14... Dial signal generator, 15
...Response detector, 16...Message tone generator, 17...Contact, 18...Coupling capacitor, 1
9, 19'... Holding resistor, 20... Coupling transformer, 21... Winding wire, 22, 22'... Coupling transformer, A... Calling telephone, B... Receiving telephone, C...
Calling phone, D... Transfer destination phone.

Claims (1)

[Scope of Claims] 1. An incoming signal detector 13 connected between an incoming telephone set B and an outgoing telephone set C to detect the arrival of a ringing signal to the incoming telephone set B; a dial signal generator 14 for calling the transfer destination telephone D via the originating telephone line 5'; a response detector 15 for detecting off-hook of the transfer destination telephone D; a message tone generator 16 that notifies the user of the message tone generator 16, a called side holding switch 12 that holds the incoming telephone line 5 of the incoming telephone set B on which the message tone generator 16 operates so that it can transmit and receive calls, and the incoming signal detector. When 13 is activated, a called side holding switch 12' holds the calling telephone line 5' of the calling telephone C so that it can transmit and receive calls.
When the operation of the message tone generator 16 is completed, the incoming telephone line 5 and the outgoing telephone line 5'
The incoming telephone line 5 is connected to the outer winding of the coupling transformer 22 via the incoming side holding switch 12, and the outgoing telephone line 5' is connected to the outgoing side holding switch 12. 12' to the outer winding of the coupling transformer 22';
A telephone transfer machine in which the inner winding of the coupling transformer 22 and the inner winding of the coupling transformer 22' are connected via the coupling switch 4. 2. An incoming signal detector 13 connected between the incoming telephone set B and the outgoing telephone set C to detect the arrival of a calling signal to the incoming telephone set B, and the outgoing telephone line 5' of the outgoing telephone set C. a dial signal generator 14 that calls the forwarding destination telephone D via the forwarding destination telephone D;
a response detector 15 that detects off-hook of the incoming call, a message tone generator 16 that notifies the forwarding destination phone D that the call is a forwarded call, and when the message tone generator 16 is activated, the incoming call of the incoming phone B is activated. A calling side holding switch 12 holds the line 5 so that it can send and receive calls, and a calling side holding switch 1 that holds the calling telephone line 5' of the calling telephone C so that it can send and receive calls when the incoming signal detector 13 is activated.
2' and a coupling switch 4 for coupling the incoming telephone line 5 and the outgoing telephone line 5' when the message tone generator 16 has finished operating; The incoming side holding switch 12 is connected to the incoming telephone line 5 via the holding resistor 19 to form a DC loop, and the outgoing telephone line 5' is connected to the incoming winding of the coupling transformer 20. A telephone transfer machine connected to the calling side winding of the coupling transformer 20 via the side holding switch 12'.