JPS5839437B2 - This telephone connection method for button telephone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a telephone connection system for a button telephone device in which the telephone is connected to a main device and used as a button telephone.

Figure 1 shows a conventional example of connecting this telephone to a button telephone device, where 1 is the main device, 2 is the button telephone, 3 is the main telephone, 8 and 9 are telephone lines (hereinafter referred to as office lines), and 14.15
is the central office line of the button telephone device, 1o and ii are the resistances, 12.1
3 is an extension of the button telephone device, 27.28 is a control line of the button telephone device, 6 is a control unit of the button telephone device, 4a, 5a
is a relay, 4a-1, 4a-2, 5a-1 are respective contacts, 7-1. γ-2 and 7-3 are the capture switches of the telephone 3, 17-1 and 17-2 are the central line capture switches of the button telephone 2, isi, 18-2 are the hook switches of the button telephone 2, and 24 is the hook switch of the key telephone 2. The telephone 3 has a hook switch, 19 is a communication circuit within the button telephone, and 26 is a bell of the telephone.

In general, the operation of a key telephone is such that the key telephone 2 raises the handset, sets the hook switch i s-i, 18-2, and operates the central office line capture switches 17-1, 1γ-2 to pick up an extension or central office line. The information is selected and sent to the main device 1 for necessary control, but the details are not related to the present invention and will therefore be omitted here.

Now, when this device (this telephone 3 is connected and used as a button telephone), in order to detect the hook switch information of this telephone 3, a relay 5a is inserted in series in the communication lines 21 and 22 of this telephone 3. It is necessary to use a contact point to act as a hook switch.

However, in the present telephone 3, the bell 26 is generally connected to the communication lines 21 and 22 as shown by the dotted line, and a separate line 23 is not provided as shown in the figure.

However, if you do not use the method shown in this figure, the bell 26
If you connect the switch between telephone lines 21 and 22, when a central telephone call is made from the button telephone 2 side, the central telephone capture switch for this telephone 3 will be activated on the main unit 1 side. If -2 or 7-3 is pressed, the bell 26 is connected in parallel with the main telephone 3, so there is a risk that the bell 26 will resonate with the dial pulse of the button telephone 2, and when a central office line call is received, the switch will be turned off. Depending on the situation, the bell 26 may or may not ring, making me feel unwell.

Therefore, as shown in the figure, the relay 4 that normally operates when energized
The bell 26 is disconnected by the contact point 4a-2 of a, and the bell circuit 26 is operated only during a power outage.

As described above, the conventional connection circuit has the disadvantage that it is necessary to modify the interior of the telephone 3 and to add an extra terminal and an extra line 23.

The present invention eliminates these drawbacks and provides a telephone connection method for a button telephone device that allows the telephone to be easily connected.

The present invention will be described in detail below based on the drawings.

FIG. 2 is a block diagram of the present invention, in which the same numbers as in FIG. Relays to be controlled, 4b-1 and 4b-2 are their contacts, 5b is the central office line capture relay of this telephone 3, 5b-1
is the contact point.

The operation will be described below. The relay 4b is a relay that is normally energized and operates, and its contacts are in a dotted line state.

In this state, this telephone 3 raises the handset and hook switch 2
When 4 is closed, the communication lines 21 and 22 are connected to 4b-1°4.
The contact b-2 connects to the DC supply resistor 10.degree. 11, and the hook switch detection circuit 29 operates based on the information and sends the signal via 30 to the central line capture switch 7-1.

Therefore, when 7-1 is closed, the signal is sent to the central line acquisition and holding circuit 31 in parallel with the control section 6.

31 uses the information to restore the relay 4b.

Therefore, this telephone 3 is connected to the office lines 8 and 9 via the relay 5b at the contacts 4b-1 and 4b-2 (solid line side), so the relay 5b operates and the contact 5b-1 and maintain the station line acquisition state until the end of the call.

In this way (in the present invention), the connection of this telephone is not simply done with a mechanical central office line capture switch, etc., but the capture signal of this telephone 3 is used to determine whether connection is possible or not. The bell is connected to the central office line in multiple ways, and the bell resonates.
When it is unnecessary (the bell will not ring when a call arrives at this station,
The bell 26 in the telephone does not require any modification.

In the event of a power outage, the relay 4b is restored and the telephone 3 can receive calls from the central office line at any time via the bell 26.

Although 5b is performed using a relay in the present invention, it goes without saying that it can also be performed using other means, such as a magnetic transmission element or an optical transmission element.

Further, it goes without saying that the present invention is not concerned with the number of control lines on the button telephone device side.

Additionally, it is not always necessary to ring the bell 26 when the relay 4b is restored during a power outage, and it goes without saying that the key telephone device itself may be provided with an incoming call ringing device in the event of a power outage.

FIG. 3 shows an embodiment of the invention.

The operation is described below.

When normally energized, the relay 4b is operated by the resistor 37 and the transistor 38G, and the contacts 4b-1 and 4b-2 are on the dotted line side.

In this state, when the telephone 3 presses the central office line acquisition button and lifts the handset, a communication path is established using the next route.

(■→Low resistance 0→Diode 32→Contact 4b-1→Talking line 21→Main telephone 3→Talking line 22→Contact 4b-2→Resistance 11→Ground) At the same time, the transistor 34 is turned on by the current flowing through the resistor 33 This will happen.

Therefore, current flows through the following route.

[■ → Transistor 34 → Switch γ-1 → Resistor 35 →
Base-emitter of transistor 36 → Earth] Therefore,
Transistor 36 is turned on and transistor 38 is turned off.
Since it becomes F, the relay 4b is restored.

For this reason, the telephone 3 is connected to the central office lines 9 and 10 via contacts 4 b-1 and 4 b-2 + relay 5 b.
Relay 5b operates.

Therefore, the contact point 5b-1 is made and continues to supply (2) in place of the transistor 34 to maintain the central line.

At this time, even if the button telephone 2 is operated, the transistor 34 does not operate because of the presence of the diode 32, and the telephone 3 maintains the extension state.

In the event of a power outage, the relay 4b is naturally restored, so the operation is the same as in FIG. 2.

FIG. 4 shows another embodiment of the present invention, in which the telephone lines 12 and 13 of the button telephone device are used in place of a central office line and an extension line, or when the telephone 3 is connected to a central office line. The present invention is also effective in cases where a simple mechanical switch such as a capture switch cannot be used.

It goes without saying that the DC power supply does not necessarily have to be used as the extension line of the key telephone as shown in FIG. 5, but may supply current to each telephone separately.

As described above, the present invention includes a loop monitoring means 29 that outputs a detection output 30 when the telephone 3 forms a loop circuit with respect to an extension communication circuit (including the example of 12° 13 and FIG. 5);
When this loop monitoring means 29 outputs the detection output 30, the telephone key 7-
1 is operated, the extension circuits 12 and 13 of this telephone 3
．． A loop circuit for the switching means 31, 4b, 4b-1, 4b-2 for switching the connection to the central office lines 8, 9 and the central office lines 8, 9 of the telephone 3 was formed. a detecting means 5b detecting the formation of the loop circuit; and a switching means 31 while the detecting means 5b detects the formation of the loop circuit.
, 4b, 4b-1, and 4b-2.

Moreover, the switching means 31, 4b, 4b-1, 4b-
2 is a relay 4b that performs the switching operation at the time of restoration.

By using 4b-1 and 4b-2, there is no problem in operation even during a power outage.

As explained above, according to the present invention, modification of the present telephone,
There is no need to change the cord (this has the effect of making it easy to connect the phone).

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a conventional circuit example, FIG. 2 is a schematic configuration diagram of the present invention, FIG. 3 is a circuit diagram showing one embodiment of the present invention, and FIG. 4 is a circuit diagram showing another embodiment of the present invention. , FIG. 5 is a circuit diagram showing a partially modified example of the embodiment of the present invention. 1... Main device, 2... Key telephone,
3...This phone.

Claims (1)

[Scope of Claims] 1. Loop monitoring means for outputting a detection output when the present telephone forms a loop circuit with respect to the extension communication circuit O; and a loop monitoring means for outputting a detection output when the present telephone forms a loop circuit; a switching means for switching the connection of the telephone to the extension communication circuit to the office line when a telephone key is operated to capture the office line; and a loop circuit for the telephone to the office line. This telephone connection method in a button telephone device includes a detection means for detecting the formation of the loop circuit, and a holding means for holding the switching state of the switching means while the detection means detects the formation of the loop circuit. 2. The present telephone connection system in the button telephone device according to the preceding item, characterized in that the switching means is constructed using a relay that performs the switching operation at the time of recovery.