JPS6112158A - Public telephone set - Google Patents

Abstract

PURPOSE:To attain low cost and miniaturization by using a single detection relay only to detect a response of an opposite party and operation of an emergency switch for circuit forming. CONSTITUTION:A control section CNT starts the control operation by the ON of a coin detection contact CCL and the ON state of a hook switch HS<1> in response to the deposition of a coin after hook-off. When the opposite party responds after dialing, a detection relay ANS is operated, held and the information representing the response is transmitted to the control section CNT. In operating an emergency switch ES after emergency talking, the detection relay ANS holds the operation and even if the detection contact CCL is opened, the talking is enabled by a contact ans<1> and the information representing the operation of the emergency switch ES by a contact ans<3> is given to the control section CNT.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] A relay detects the polarity reversal of line voltage in response to a response from the other party after leaving the base, and also makes a free call in response to the operation of an emergency switch. It concerns public telephones that are allowed.

[Prior art]

FIG. 1 is a circuit diagram showing a conventional example. When a coin is inserted after the hook switch H81 is activated by reed and off-hook,
Coin detection contact (hereinafter referred to as detection contact) CCL is on
5 A direct current loop is closed by the telephone call circuit TKO, from the first line terminal L1 to which the positive line of telephone port # (hereinafter referred to as line) is connected, to the second line terminal to which the negative line of the line is connected. A loop current is passed to L2, and a dial circuit (not shown in the diagram) can make a dial call, and the exchange connection is established by the exchange responding to the dial call.

When the other party responds after the exchange connection is completed, the polarity of the DC voltage applied to the line from the exchange is reversed, and the voltage is transferred from the line terminal L2 to the diode D5 - through the make pole of the hook switch H62, which is in the off-hook state. Communication circuit TKO - diode D6 - detection contact CCL - diode D2 - hook switch H8'' - response detection relay (hereinafter referred to as
Detection relay) ANS-Line terminal, current is passed through the route, and this causes the latching type detection relay ANS
performs the operation and holds it.

Then, the contacts ant' and ans2 of the relay ANS operate, and the contact ans1 bypasses the diode D1, and the contact an- prepares a recovery route for the failure detection 91 NO ANS.

When on-hook is performed in response to the end of the call, hook switches H8' and H8'' are restored and the line voltage is in the initial state, so this time, line terminal L1 - detection relay ANS - hook switch H8 A current flows in the opposite direction to that during operation through the route of contact ans2 - diode D3 - line terminal L2, which restores the detection relay ANS to its initial state and restores the exchanger by opening the DC loop. do.

In addition, when making an emergency call, go off-hook and
When the non-locking type emergency switch ES is operated, the latching type emergency relay CF is energized via the detection contact CCL, which is in the process of being restored, without inserting a coin, and this maintains operation, so the contact ef of this is turned on. Then the detection contact CC
I, and closes the DC loop.
You can dial a specific number and make calls in response to the other party's response.

Note that when on-hook is performed in response to the end of the call, the line terminal L1 - hook switch H8'' - emergency switch:
, /ChigS-Emergency Sl/ -Cp'-Detection contact CCL-
Electricity is supplied to the route of contact cf - diode D4 - communication circuit TKO - diode D7 - line terminal L2 in the direction opposite to that during operation, thereby restoring the emergency relay CF to the initial state.

However, in such a conventional configuration, each relay A is a latching type that performs multi-operation holding using a permanent magnet or mechanism.
The system requires an NS and a CF, which are expensive and require a large space to accommodate, creating drawbacks that hinder the reduction in price and size of public telephones.

[Summary of the invention]

The present invention has the purpose of fundamentally eliminating the drawbacks of the conventional one, and by improving the circuit configuration, the detection relay and the emergency relay are shared, and the same function as the conventional one is realized by only the detection relay. The present invention provides an extremely effective public telephone set.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to FIG. 2 showing an embodiment.

In the same figure, the anode of the first diode D1 is directly connected to the make contact H8' of the hook switch connected to the line terminal Ll, and the cathode of this and the communication circuit T
A detection contact CCL is connected between one end of KC,
Detection relay A for diode and detection contact CCL
The make contact ans" of the NS is connected in parallel, and the anode of a second diode D2 is connected between the diode D and the detection contact CCL. The cathode of this diode is connected to the transfer terminal of the hook switch. It is connected to one end of a magnetic latching type detection relay ANS via the make pole at contact H82.

In addition, the other end of the detection relay ANS is connected to emergency switches F and S.
line terminal Ll via the break pole side transfer contact of
The transfer contact mns" of the detection relay ANS is connected to the other end of the detection relay ANS through the make pole of the transfer contact of the emergency switch ES, and the break pole is connected to the other end of the detection relay ANS, and the transfer contact H8 of the hook switch The make pole is connected to one end of the detection relay ANS via the break pole at ", and the anode of the third diode Ds is connected to the main pole of the contact ins", and the cathode of this is connected to the line terminal L2. connected to the communication circuit T via the constant voltage diode ZD.
Connected to the other end of KO.

Therefore, when a coin is inserted after off-hook, the hook switch H31 is turned on and the detection contact CCL is turned on.
A DC loop is closed via the telephone communication circuit TKO and the constant voltage diode ZD, making it possible to make a dial call in the same way as in FIG. ,
The Zener voltage causes the capacitor C1 to be charged via the discharge blocking diode D4, and the terminal voltage of this is supplied as a local power source to the control unit CNT, which includes a processor such as a microprocessor, memory, etc.
T starts a control operation in response to a rise in power supply voltage.

Then, when the other party answers after dialing, due to the polarity reversal of the line voltage, line terminal Lg - diode D - telephone circuit TKO constant voltage diode ZD, - diode D8 - contact CCL - diode D! -Hook switch H8'' -Detection relay AN8 -Emergency switch ES -Line terminal energizes in the direction of operation through the route, and detecting relay A
NS operates and holds the contact an
s' Yoshi diode D, and detection contact CCI,
, and prepares a recovery route through contact ins", and provides information to the control unit CNT that the other party has responded through contact ans3.

When on-hook is performed in response to the end of the call, the line terminal L1 - emergency switch ES - detection relay ANS - hook switch l'lS" - whale an+s" - is activated in response to the restoration of the hook switch H8 penalty furnace as shown in FIG. Diode D3
- Current in the recovery direction passes through the route of line terminal L3,
When the detection relay ANS is restored to the initial state, the DC loop is opened and the exchange is restored.

In addition, during an emergency call, if you operate the non-locking emergency switch ES after going off-hook, the line terminal L1 - hook switch H81 - diode DI - diode D2
- Hook switch H8" - Detection relay ANS - Emergency switch ES - Contact ana" - Diode D3 - Line terminal L
2 route is energized in the direction of operation, and the detection relay ANS
maintains the operation, and the diode D is connected to the contact &n8'.
1 and the detection contact CCL are bypassed, and even if a coin is not inserted and the contact CCI is off, the DC loop is closed and the call is possible, and the contact ana"
Accordingly, the recovery route is prepared in the same manner as described above, and information indicating that the emergency switch ES has been operated is provided to the control unit CNT through the contact ans3.

In addition, in response to on-hook after the end of the call, power is supplied in the direction of restoration through the same route as described above, and the detection relay ANS is restored.

However, it is necessary to use an early make type contact (ILnB) that turns off the break pole after the detection relay AN8 sufficiently approaches the operation holding state.

Further, the control unit CNT connects contact a immediately after the start of the control operation based on the start of supply of local power corresponding to the closure of the DC loop.
If information from "im" is given, emergency switch ES
It is determined that this is an operation by the other party, and the dialing of a specific number is allowed free of charge.However, if information is given from the contact ans after a certain period of time has elapsed from the start of the control operation, it is determined that the other party has responded, and the coin is released. It is used to control storage, etc.

In addition, Diode D! , D3 is the detection relay ANS
The diode D5, which is connected between the emergency switch ESO main pole and the break pole, is used to prevent malfunction by passing current only in a specific direction to the emergency switch ESO. This is to prevent interruptions in the DC loop.

Therefore, by using only a single detection relay ANS, it is possible to detect the other party's response during a paid call and the operation of the emergency switch ES assuming a free call, and it is also possible to form a circuit according to these conditions. This makes it possible to easily reduce the cost and size of public telephones.

However, as the detection relay ANS, in addition to one that uses a permanent magnet to maintain reverse operation, it is also possible to use one that maintains operation mechanically, and depending on the conditions, the diode D may be omitted or The same applies if a break contact is used for the contact &n83.A) The power for the control unit CNT may be supplied separately, and the control operation may be started in response to the flow of loop current or the operation of the hook switch contact. In particular, various modifications are possible, such as the control unit CNT may be configured by a combination of various logic circuits without using a processor.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, two latching type relays are integrated into one, and the number of parts and housing space are reduced, making it possible to reduce the price and size of public telephones. However, remarkable effects can be obtained in charge-type public telephones.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a conventional example, and FIG. 2 is a circuit diagram showing an embodiment of the present invention. Ll, Ll...-Line terminal, H8"...Hook switch (make contact), H82...Hook switch (transfer contact), -D s~D3...
Diode, CCL 11e...detection contact (coin detection contact), TKO...talk circuit, ANS...detection relay (response detection relay), ansl...contact (make contact), an112...・Contact (transfer contact), anlI3φfist 0 contact 1CNT...Control unit. . Patent applicant Tamura Electric Manufacturing Co., Ltd. Nippon Telegraph and Telephone Public Corporation

Claims (1)

[Claims] A make contact of a hook switch connected to a first line terminal to which a positive line of a telephone circuit is connected, a first diode having an anode connected to the make contact, and a connection between the cathode of the diode and one end of the telephone circuit. a second diode having an anode connected between the detection contact and the first diode; and a make pole between the cathode of the second diode and the transfer contact of the hook switch. a latching type response detection relay, one end of which is connected to the first end of the detection relay;
A break pole side transfer contact of the emergency switch is connected to the line terminal of the emergency switch, and a break pole is connected to the other end of the detection relay via the make pole of the transfer contact, and the break pole side transfer contact of the hook switch is connected to the other end of the detection relay. a transfer contact of the detection relay whose make pole is connected to one end of the detection relay via a pole; and a second line terminal whose anode is connected to the main pole of the contact and to which the negative line of the telephone line is connected. and a third diode having a cathode connected to the other end of the communication circuit, and a third diode having a cathode connected to the other end of the communication circuit;
and a make contact of the detection relay connected in parallel to the coin detection contact.