DE665930C - Circuit arrangement for coin operated telephones with network group traffic - Google Patents

Description

Circuit arrangement for coin operated telephones with network group traffic subject of the main patent is a circuit arrangement for l \ Tetzgruppe coin telephones, where the control of the fee control switchgear in the office by the pay phone controlled, series-connected money pulse relays with different pick-up characteristics he follows. To enable coins to be inserted before and after you lift the receiver, the money pulse relays are equipped with counter-windings, which are in different Branch lines are connected and one of which is winding with the occupancy relay is connected in series. When you lift the handset, there is no switching effect exercised on the money pulse relay, since both windings of the money pulse relay are in the opposite direction Senses are aroused. However, the tightening conditions are reduced by the counter-windings the money pulse relays, which are supposed to respond to currents of different strengths, are unfavorable influenced.

The present invention is now intended to improve the security of this known Circuit are increased, so that a particularly precise adjustment of the money pulse relay can come in failure and the work of the money pulse relay from fluctuations in Line resistance is largely independent. According to the invention this is thereby achieved that a separation of the line loop formed by lifting the handset in the case of an outgoing connection by a and Auxiliary relay of the payphone connected in series with your occupancy relay in the office is brought about and is lifted again when the Numinern disc is opened. the circuit is chosen according to the further invention so that when pulling up the dial (at the beginning of the election) dialing pulse relay switched to the line with simultaneous Shutdown of the Get +, pulse relay is pre-excited by the occupancy relay, see above that already the first choice =. pulse can be picked up by the dial pulse relay can. Since the separation of the line loop in the Coin operated auxiliary relays under the influence of one of the hook switches controlled number disk auxiliary contact is in order to exclude the possibility of fraud, this auxiliary relay is equipped with a second winding that goes into the pick-up circuit of the locking magnet is switched, so that even when the receiver is hung up for a short time a secure drawing of the connection is guaranteed.

In the figure, only those parts of the circuit are shown which are necessary for an understanding of the invention. The charge selector controlled by the money pulse relay and the device for checking that the amount inserted corresponds to the value of the connection established by appropriate switching mechanisms in the office have been omitted. The circuit is therefore to be supplemented accordingly by the devices of the main patent. For the switching means that correspond to the same switching means of the main patent, the same reference numerals of the main patent are chosen. In contrast to the circuit of the main patent, an auxiliary relay R with two windings RI, R II is provided in the coin telephone, of which the winding R II should be high-resistance. The hook switch operates two sets of contacts, of which the contact ka closes at the beginning of the movement of the hook switch. the contact set ke with the contact springs i ke, ke, 3 ke is only turned over at the end of the movement of the hook switch. The dial is equipped with a decade contact, which is thrown when the dial is opened for the first time and remains in the working position until the receiver is hung up. This decade contact has two contact springs i dk and 2 dk. As in the main patent, the money pulse contacts are designated with glo and g, - ,, which are briefly turned over by inserting an io-pfennig or 5o-pfennig piece. The mode of operation of the circuit is as follows: If the coins are thrown in before the handset is lifted, the coins are thrown in without any influence on the occupancy relay A , since the line leading to the relay A is interrupted by contact 2 ke. The control of the money pulse relays Xlo and X ,, 0 takes place via the b-wire A through the contacts glo and g5o. The `contacts i xlo and ix 'are used to set the charges @ väliler. By lifting the receiver, the contact ka. Is switched when the hook switch begins to move, so that the relays A and R in the following circuit are activated: Earth, RI, i ke, Iza, i dk, i sin, i kr, i d, i st, i y, A, battery. Contact 3a leaves the preselector Uli 'on . Relay R binds via a contact ir and therefore remains energized, when the contact i ke opens the connection path again at the end of the movement of the hook switch.With contact 2 r, the relay R opens the loop closed by the contact - ke, so that wires a and b are completely separated from each other even after lifting the receiver are, with the exception of a bridge formed by a small capacitor C, over which the official signal can reach the handset.

After lifting the receiver, the money pulse relays X., 0 and X50 are controlled as before via the b-wire through contacts 91 ″ and g;, 0. The money pulse relays are switched off and the line loop for transmitting the dialing pulses is only switched off through the raising of the dial. By (las first raising of the dial, the contact i folded dk and thereby open the circuit for relay R and A, since the line loop is now on both sides leads to the battery. In the Bader is lk 2 (the lockup solenoid S11I In order to avoid the difficulty in the known circuit in generating the impulses by dividing the impulses into two different relays, the current impulse relay J is pre-excited via its winding JII by the contact ia of the bending relay A i (ik the line loop is established, while relay D is energized by the fall of relay A in the office via contacts 2v, 2a approx. Relay I 'had already been attracted by the pre-excitation of relay J. The relay J is delayed by a short-circuit winding J1, so that after opening the contact ia it lasts until the contacts i d and 2 d have established the circuit for the relays J and ß. When the dial expires, the relay J is energized in pulses by the pulse contact ftsi and transmits the current pulses through contact 2 i. to the office. Through the contact 3 i. the rotary magnet of the follower, not shown, is controlled. The short circuit for winding J 1I is canceled by the Ilontalct 3 d, so that the relay .1 works without dropout delaying during the pulse generation. Contact 3 d switches on relay I ', which should be dropout delayed.

When the receiver is hung up, the blocking magnet S1l is excited via the battery, J II, 2d, b-wire, 2 die, 3 ke, SAI, earth. When the hook switch is fully depressed, the delay contact block is returned to the rest position, so that the low-level path of the blocking magnet is opened. The blocking magnet SII has, however, bound itself via its high-resistance winding and the high-resistance winding R11 of the relay R. In this circuit, the relay R responds while the relay J drops out. The release of J is initiated in the office, which in the case of a chargeable connection leads to the cashier by energizing the cashier relay, which is not shown. The cashier magnet KLlI is attracted via contact i kr of this relay. If the checkout process has ended or if the checkout has not taken place at all in the case of a connection that is not subject to charges, relay D drops out. As a result, the b-wire is de-energized, so that the blocking magnet SJI and the relay R also drop out. The relay R is, however, drop-out delayed, so that the relay R keeps on via its contact ir, the contact i ka, the contact iv and the resistor II'i, or via A, if I- has dropped out, "- on if the The speaking guest had already picked up the receiver again and thus thrown the contact i lza. This case can occur if the hook switch was only actuated with a short blow. Without the pre-excitation of the relay R via the blocking pins, in such a case the temporary contact closure, which is caused by the contacts lze and ka. will be unsuccessful, since during the closing time of these contacts the release in the office may not have occurred, i.e. there is still no battery on the a-wire. However, due to the pre-excitation of R and its delayed fall, relay A is re-excited in the office after D and I 'fall.

If the speaking guest on the coin-operated telephone does not hang up in the prescribed manner, but operates the hook switch so far that the ke contacts open, but the number disk auxiliary contacts dk are not yet reset, then the blocking magnet S11 is excited via 3ke without triggering to lead in the office, since the relay J does not drop out via the winding S 11 I. On the other hand, when the locking magnet is attracted, the relay B drops out, which sends a busy buzzer to the voice lines via 3 b and .I d. The sum symbol is transmitted to the subscriber via a capacitor C. The normal release only occurs when the partial liner switches the hook switch in this way. deeply depressed that the number disc contacts i dk and 2 dk trigger and thereby the low-resistance path for the locking magnet S_lI is opened.

When there is incoming traffic, the relay U is energized by the line selector via the cAder. Through the contacts i ii and 2 ii of this relay, the speech wires are switched to the line selector so that earth from the line selector to the a-wire and the battery from the line selector to the bAder. As a result, the relay R cannot respond when the receiver is lifted. Therefore, when the hook switch opens the contact i kg after completing its movement and closes the contact 2 ke, the speech loop is closed and the relay R is disconnected from the speech vein.

Claims (5)

PA Tr`TAvsPRücziL: i. Circuit arrangement according to patent 639 778 for @ lünzferiissprecher finit network group traffic, in which the control of the charge control switchgear is carried out by means of a series-connected money pulse relay with different pick-up characteristics, which is controlled by the coin-operated telephone, characterized in that the line loop formed by lifting the handset is disconnected in the case of an outgoing connection by a Handset activated and finite occupancy relay (A) in the office connected in series auxiliary relay (R) of the coin operated telephone and is canceled again when the dial is opened (contact I dk). 2. Circuit arrangement according to claim i, characterized in that the connection of the auxiliary relay (R) via a contact device controlled by the handset hook (ka, 1, e) takes place, via which a contact closure only when the hook switch is moved caused, and that the auxiliary relay (R) has its own contact (i r) into one of the number disc contact (i (17z) dependent, via the occupancy relay (A) leading circuit switches. 3. Circuit arrangement according to claim i and 2, characterized in that the auxiliary relay (R) has two windings (RI, R II), one of which is a high-resistance winding (R II) in series with the blocking magnet (S IJ) and in parallel a circuit formed by the number disc contact (2 dk) and the receiver hook contact (3 ke) is switched, with the effect that when the hook switch is fully depressed and the groove disc auxiliary contact (dk) is reset at the same time, the auxiliary relay (R) responds and a control relay (J) in the transformer is below simultaneous triggering comes to waste. q .. Circuit arrangement according to Claims i to 3, characterized in that the auxiliary relay (12) when resetting the Dial auxiliary contact is brought to attract, as a result of its drop-out delay is excited when the hook switch is pressed down for a short time and is in a by picking up the receiver again. 5. Circuit arrangement according to Claims i and 2, characterized in that by one Contact (i a) of the occupancy relay (A) activates the dial pulse relay when you lift the handset (J) is pre-excited so that when the dial is pulled up on the line switched dial pulse relay (J) can already receive the first dial pulse.