DE914623C - Improvements in automatic telephone systems - Google Patents

Description

Improvements in Automatic Telephone Systems The invention relates to on telephone systems and switchgear and on the circuits used with them. The invention particularly relates to a telephone system having switches, the contact sets and contain a control mechanism for setting the switch, which is equipped with receiving devices for control circuits that make the setting of the switch. The control mechanism is controlled by the contact sets a ratchet arrangement via contacts from which the circuits start, severed.

In known arrangements of this type, it was necessary in the Control mechanism to incorporate a switching relay since it has been essential that no connections when moving over contacts that when setting the connection are not required, can be done. Therefore the speech lines for each switch in addition to the contacts of the switching relay, which consists of a special Contact material are made and of high quality, ratchet contacts and comb contacts, which depend entirely on the effectiveness with regard to their contact performance which when contact is made by rubbing the work surfaces from dirt, grease and the like, which may interfere with a good electrical connection, getting cleaned.

The main purpose of the invention is to give a device in which a more efficient conversation transmission circuit is achieved with the help of switches is made by reducing the number of Contact elements and especially by reducing the number of those contact elements that affect their performance depend on the friction.

According to the invention, the contact set consists of pairs of cooperating Contacts arranged in sets according to the performances of each outlet are. The associated contacts of each pair are immediate, e.g. B. without intermediate contacts, to the incoming lines on the left in Fig. 6) and to contacts 71 of the ratchet assembly connected so that this facility enables one through a switch Established speaking circuit does not run through the ratchet assembly.

The invention can be more easily understood with reference to the drawings, namely Fig. i shows a partial perspective view of a straight line Contact set with contact strips and contacts made of special metal, with a desired Connection established by appropriate handling of cordless contact members which are referred to as switching arms for the sake of simplicity; Figures 2 and 3 show the circuits of a control stage with ten output lines per stage of a group selector and the basic control circle for this; Fig. Q. shows a plan view on a smaller scale a two-stage selector with cam drive and also the position of the contact set in relation to the voter; Fig. 4a shows the top view of the first carriage trip control mechanism with the carriage in its normal position, while Fig. 4bb shows a similar view for the position shows when the switch makes the second release movement from the position in which he was previously set, was completed and is about to change his to begin the first release movement; Fig. 5 shows a reduced perspective View of the complete selector, which is clamped to a contact set; 6 shows a circuit diagram of an (io / io-) battery test group selector; Fig: 7 shows a circuit diagram of a normal (i o / i o-) line selector; Fig. 8 shows the circuit diagram with two to twenty lines of an io / io multi-line selector for an extension; Fig. G shows the circuit diagram of the control relay set for a set of group selector and line selector switches.

A contact set consists of continuous strips 23, which over the entire length of a predetermined. Unit going through and which at the opposite Sides of the voters are bracketed (Fig. I) to fixed contact members li form. The space between the clamping members forms the contacts for a voter: At their ends. the contact strips 23 are bent to connecting lugs to build. That part of a column of contact records that is assigned to a voter is, is referred to below as a selector contact set, so that Fig. i is a partial view of two voter contact sets, each of which has three steps with two conductors each owns. Each set of contacts is preferably a set of hundreds; H. with ten steps of ten contact sets each. Each set of four contacts will have four strips in front and four combs 2.4 formed. The usual eleventh contact set is also in each step 25 to indicate that the line is busy.

A multiple field column usually consists of twenty such contact sets, which are arranged one above the other, with uninterrupted strips 23, which with connected to the outgoing trunk lines. The switching function of the usual voter arms and cords is taken from a set of combs 24, one of which is provided for each row of strips, which is usually be referred to as a stage, and which finger 26 has that with the various Contact set strips are in a line. Each finger of a plate with combs 24 forms a movable contact member. All contacts of the contact set are off made of special contact material, usually from a precious metal, z. B. Silver, and to ensure economic efficiency, all silver-base metal compounds are used produced by rolling. This rolling process takes place before the metal is annealed carried out.

As described later, each selector switch mechanism is connected to its own Contact set latched in the manner shown in Figure 5. His switch arms are lying in their rest position normally one step before the first step of the contact set. Suitable intermediate layers are used to meet these requirements 21, 22 (Fig. Q.) Between the vertical. Poles. ig and. 2o and the neighboring ones Clamping rods 1 ¢ laid. From Fig. Q. is clear; that the clamping rod 15 the Selector switching mechanism is facing and is so long that it over the side surfaces the vertical links 17 and ig protrudes to accommodate fastening nuts or, alternatively, countersunk fastening screws (Fig. 5) can be used. The other Clamp rod is so long that it attaches. one end protrudes about 20 mm to one to form suitable support for the contact set column when assembling the strips.

The switch mechanism that controls the movement of the switch or contact set arms controls, has two movements: one across the contact set and one into the contact set into it. These movements are known as primary and secondary movements. It Let us now describe the switch construction with reference to Fig. q. given.

Fig. ¢ is partially schematic and therefore does not exactly agree corresponds to the actual design. So are z. B. the drive cams are not circular with a central pivot and overlapping the continuously acting work roll shown while the primary cam is eccentric is attached. The secondary drive cam, which the secondary slide per revolution by two Steps forward is the same size as the primary cam.

Another point through which. themselves. the one shown in Fig.4 Voters from the usual type of construction is that the primary cam is shown as a two-stage releaser, while the secondary cam is a single-stage releaser so that the first is only disengaged and engaged with the drive pulley comes when the corresponding control relay him. releases after pressing it has been while. the latter is released and engages the roller, as soon as the secondary control relay works. With those to be described later. Circuit arrangements are therefore the voter only for a group voter capacity suitable if it responds to a series of impulses for its primary direction of movement should and if he has self-propelled in the secondary direction to a dialing process perform. The primary as well as the secondary cams can be easily triggered Have locking hooks, as shown in Figure 4 in connection with the secondary cam if the circuit regulations are changed accordingly.

According to FIG. 4, a hard rubber disk 47 forms the power source for the drive of the voter. She runs on a common. Wave at a constant speed or ten revolutions per second. The primary and secondary drive cams 48 and 49 are mounted eccentrically and so passable that their smallest radius is the Roll 47 not touched. Each cam has a spring 72 or 64 which is sufficient Energy accumulates to give the cam a slight rotary movement when a locking lever controlled by a control relay 74 or 75 is triggered. if a control relay has triggered the locking hook, the surface of the cam comes out after a slight movement in contact with the roller, which continues to turn the cam. As described later, the pivot of the cam is moved away from the roller, when the cam. revolves with the pressure between the cams. and the role through the load automatically prevents slippage. The pivot of the cam transmits its movement by a single link 76 or 6o directly on a slide 5o or 52. An auxiliary cam consisting of one piece with the main cam acts on a solid surface and. moves drive pin 87 into and out of engagement with the drive tooth, which avoids a ratchet wheel and pawls and a constant elongation of the slide is ensured at all times. The outline of the main cam is such that it gives the slide a constant acceleration and delay granted, thereby reducing stress to a minimum.

The carriage is built on a chassis 31 on which the primary and secondary control relays 74 and 75 are mounted, either directly or indirectly, as described later. Two carriages are provided: a U-shaped primary carriage 52, of which both side arms 53 and 54 form switching arms, and a secondary L-shaped carriage 5o, on whose long arm 5 1 the primary carriage. runs. Both carriages run on rollers and have a toothed drive link. The primary slide is moved step by step on a rail which is arranged on the long arm of the secondary slide and thus also carries the switch arms 53 and 54. A state of equilibrium is thus maintained by the switch arms which rest on a rail 34 which is arranged at right angles to them and which forms an extension of the armature 32 of the magnet. The secondary slide is moved step by step on rails formed by the chassis, which with it thus also support the primary slide and the arms assigned to it.

As an introduction to the work of the switch it is assumed that there, he as a line selector acts, d. H,. that both basic movements are caused by voter surges being controlled.

In this case, both the primary and secondary cams are a two-stage release or, instead of this, suitable circuit arrangements are provided, to enable surge control for single-stage trip cams.

The primary relay 74 is responsive to the first series of surges and couples the associated drive cam in a manner to be described later 48 with the drive pulley 47, creating one on the same pivot. seated drive link 76 receives a reciprocating motion and its tip with the toothed drive member the primary carriage 52 cooperates; by one of the number of selected current surges to bring the corresponding number of steps forward and then the switch arms in a Bring position opposite the corresponding step of the contact set. Then it will be the trigger magnet 78 energized, whereupon the attached to the armature 32 of the magnet Rail 34 lifts the shell, arms 53 and 54 slightly in their ends; so that these ends are aligned with the serrated ridges 24 of the stage of the contact set into which they are then introduced. Because the contact set consists of fixed contact members 23, which differ from the one. Side of the switch to the opposite side extend in farm of metal strips, and consists of movable contact members, one for each fixed contact member in each switch which the teeth of a comb 24 are insulating pieces between the comb plates and the strip arranged (Fig. z). The second series of received power surges acts on the secondary relay 75, which then intermittently connects the associated drive cam 49 with the Drive pulley 47 couples, whereupon the secondary drive element 6o also has a Performs a reciprocating movement and the secondary slide 50 a number corresponding to the selected number Number of steps moved. The secondary slide takes the primary slide and thus the switch arms attached to the latter. At the end of second The tips of the switching arms are counted over the corresponding contacts in the contact set. Now the release magnet is switched off to put the tips between the contacts to lower what they were previously in order to maintain a firm contact between the arriving ones The trunk line and the selected outgoing trunk line.

When the switch is to be triggered, the trigger magnet is activated excited again. The mechanical training of the primary and secondary wheels The pawl is such that the slide through. Spring tension in its normal position return and the switch arms as well. easy to follow like during the first shot of the switch, as the switch arms are removed from the contacts by the excitation of the tripping magnet of the contact set are lifted out.

When developing the new automatic telephone system on which .the voter according to the invention has a large share, both the mechanical as well as the electrical formation, and be at this stage a brief lighting of the circuit switched on, as certain aspects of the circuit system have a very large influence on the final design.

It should be noted, however, that certain mechanical features are independent of the arrangement of the circuits and vice versa. The present Invention shows how two features of the design are advantageously combined with one another can be.

One of the main differences in this selector switch is that: ß the connection function now falls to the contact set and is separated from the selector. It seems extremely desirable. this state not just for the sake of simplicity of the voter, but also to maintain effectiveness of speaking consistently. As a result, all switch contacts must be outside. of the wires going through which look like this in every voter. must like the top right Part of Fig. 3 or the upper part of Fig. 6, from which it can be seen that the voice line of each voter neither through relay contacts nor i switch latch plugs and base mounts.

When designing circles of currents that meet these conditions, the following factors had to be taken into account: r. It is highly recommended that the holding and battery power connection in the first stage or at least in an earlier part of the series of electrical surges.

2. Avoiding main line contacts means that the with two or more sets of selector arm-equipped selectors and the contact sets are not equipped with switching relays, so that generally only one output line i is available per step for each stage, e.g. B. with a voter with a hundred outlet lines (ten stages with ten output lines each), and it is proposed j., one. to use those with a hundred outlets in the new system. The new Voter drive arrangement allows ever. but a second search speed, which ge. Provides fifteen or more output lines on a direct line check. The use of such voters also allows four to be used Wires, and this fourth wire is used to complete the subsequent circuit arrangement to simplify when a voltage bridge in an earlier stage of the switch series is used.

3. The use of the fourth wire gives the: possibility of independent Avoid relays in the voters. The primary and secondary slides can be used as Relays are used because they are readily of the same general type can be used like the standard relay types used by the UK postal administration.

.I. The possibility of avoiding special bearings for the relays, allowed to give the voter the most suitable form for his own purpose, and it has been found that a simple design with a height of about 38 mm is quite possible.

Each selector usually contains three basic relays that usually are marked with A, B and C «- earth. In the present case, the circuits are such, that these relays are only provided once per series, thus eliminating the need for them of voters with a hundred outlets. is further justified and material savings can be achieved in the relay.

One of the problems caused by using the through battery powered relay is raised at an early stage in the connection the impulse. In this case the relays are usually subject to surge faults and are concentrated in the first, stage, so that there is no difference results. The magnets become an initial extra reinforcement as a result subjected; however, this has an avoidance of amplification in any case the voters themselves result, where @ the incoming current surges directly to the magnets get instead of a relay A amplified. be .. furthermore are. the magnets self-correcting and perform a single operation in the event of a power surge, no matter whether long or short.

Fig. 2 and 3 show the basics of the new circuits. The combined Primary magnet with relay VR is excited directly via the negative line (pulsing), only one step is taken for each up and down movement of the relay.

The Z-wire is used to switch between primary and secondary when operating the combined tripping magnet and relay ZR. This unit has a relatively high resistance and, consequently, a low power consumption for excitation until the secondary movement is completed. As soon as this movement begins, the relay VR, which also serves as a switch hold relay, is held by the private line and, when it is triggered at the end of the call, excites the trigger magnet again to initiate the triggering of the switch.

The only controls that reach the voter come over the four incoming wires. All signs and service calls are battery powered Relay fed. It can therefore be seen that only battery and end connections in addition to the four control wires are required. As a result, it is a six-pole Trial pawl has been used in place of the usually U-pole pawl. Where voters have a specific role to play, this number can undoubtedly be enlarged; but if the voter is solely his mechanical function has to meet, the required number is very small.

Referring to Figure 4, the primary and secondary control control relays 74 and 75 are of the standard type used by the UK Postal Administration with extensions 82 and 83 on their respective armatures for cam control. As mentioned earlier, these controls take the form of a simple pawl for secondary movement which is triggered when the relay is energized. For the primary movement, however, an escapement control is provided which requires an upward and downward movement in order to effect the release. On the primary drive cam plate 48, the part cooperating with the escapement consists of two upright pins i io and i ii, while on the secondary drive cam 49 the corresponding part of the simple hook is either pin 112 or pin 113 , which are spaced i8o ° from one another are arranged so that a half turn of the cam is necessary for each release of the hook. It should be emphasized that the cam is designed to move the secondary slide two steps forward for each revolution.

Movement, both primary and secondary, is made possible by the joint action of two disks initiated, the drive pulley 48 or 49, which interacts with the surface of the continuously rotating drive pulley 47 or the like, and a disc, not shown in FIG. 4, which has a stationary surface is in contact and during the rotation of the drive pulley the end of the piece 6o or 75 deflects more or less normal to the reverse direction.

The speed of the primary movement is exactly half that the secondary, so that the step time is 60 ms. The common division of an impulse in telephony is 66 ° / a for the effective shock (closure) and the rest for the opening. This relationship is maintained. From now on at the primary feed 40 ms and the return 20 ms, the secondary takes place Movement at half the value of this speed.

The switch works as follows: With regard to a number of selected pulses, the primary relay 74 causes the primary movement, i. H. the Primary carriage 52 is along the long arm 51 of the secondary carriage by one Number of sledges according to the selected number moves and sets the from sled 52 held. Contact arms opposite the corresponding level of the contact sets.

At the end of the pulse series, the circular arrangements exist so that the Tripping magnet 78 is excited to raise the contact arms 53, 54 slightly in their tips, whereby these tips from the combs in which they are subsequently inserted, come out.

The secondary relay 75 is now energized to be self-interrupting initiate secondary rotary motion. This lasts until the relay 75 is released, as soon as the test contact arm on a free 'output line in the selected group as a result of the indexing movement of the secondary slide, which at Advance carrying the primary carriage and arms secured by it.

As soon as the secondary movement by triggering the secondary relay 75 is complete, the trip magnet is de-energized to move the tips into the contact sets to lower that necessary for the connection between the incoming and the elected outgoing line were used. The switch is triggered by the subsequent re-excitation of the tripping magnet.

The selector wiring is done with pre-formed wires. she begins with the plug 37 (Fig. 5) and enters the chassis through an ebonite sleeve 133 a. Immediately inside the chassis, an arm is led directly to the primary drive, while the other arm to the trip magnet and the one inside the chassis Spring set leads and is led through another sleeve to the secondary drive.

From Figure 5 it can be seen that the switch plug 37 comes into engagement with a pawl 71 which is screwed to the vertical member 18 of the contact set. The pawl 71 is mounted on two insulators so that there is sufficient clearance between the pawl and the vertical member 18 to accommodate an arm of the voter chassis when it is brought into position. With regard to the latching and releasing of the selector, reference is made to the earlier FIGS. First of all, it should be noted that the secondary drive and control relay 75 can be easily removed from the voter chassis. The control relay is electrically connected to the remainder of the voter circuit by one arm of the preformed voter wiring cable. If the voter is in relation to the contact set in the position according to Figure 4 and 5, the plug 37 is at the end of the chassis arm 31 a; engaged with the pawl 7i, while an L-shaped switch piece on the same arm engages a pin i28 (Fig. 5) on the link 17. The other arm 31 b of the chassis also has an L-shaped cross-section and, with its slotted end, grasps the clamping rod 1 6 protruding from the contact set, whose nut i29 (FIG. 4) is tightened to both the chassis arm 3 1 b and the To connect contact set (on his voter) with the support member 130 , which sits on the column in the office. At this point, the clamping rod 16 is also grasped by the slotted end of an elbow (FIG. 4, not shown), the other, slotted end of which is grasped by the pin in the chassis arm 31b. So if the voter is to be disengaged; so it is first necessary to loosen the locking nut 129 and then hold the secondary unit in place with one hand while the chassis is withdrawn with the other hand. While the chassis is being retracted, the secondary unit can be tilted inward; so that it comes free of the roller drive, and can then also be withdrawn. As already mentioned, this unit and the chassis are connected to one another by the wiring cables. When the selector is to be latched, the reverse process takes place, so that the secondary unit is inserted first and then the chassis is coupled, whereupon the locking nut 129 is tightened.

The slide mechanism of the switch can be easily removed from the chassis will. If rubbing shift arms are used, this decrease is done through use a compact plug and socket connection in the circuit of the switch arm cords.

Another point to be made is that, though As described so far, the switch arm tips two line movements at right angles to each other, followed by a slight turning movement, if a Dialing is effected, the invention also has in mind the case where the last Push-in movement also linear and at right angles to the first of the two main switching movements is.

Various principles have already been explained for the switching arrangements to which others are now to be added. The group and line voters should be kept as simple and standardized as possible, and all changes should take place in the battery-powered relay set, which is a special unit is latched and is used to control the successive switches. Apart from that from the question of standardization lies one of the main advantages of this type of Circuit in the fact that improvements can be introduced without the touching mechanical parts of the office. One of these examples described later is with the introduction of the timing device of the surge circuit (British Patent 549 047) described by means of which responsive to power surges Circuits are used regardless of the ratio of the absorbed current surges to work, with the separate timing functions of the usual relays B and C are combined with a timing function which only shows the total length of each Current impulse measures, instead of the individual parts of the same as before. With the normal Design of an office would require every voter in the office to change to introduce this feature. now it can simply be used or omitted by changing the first relay set. With the increasing length of the connection, about which to choose and the general implementation of AC methods this point is very important.

Let us now consider the circuit according to FIGS. 2 and 3 in detail. As mentioned in British Patent No. 556,619, the main drive cam is two-stage release, while the secondary drive cam only has a single stage release if the switch is to work as a group switch, d. H. with chosen Primary movement and free secondary movement and from a simple control circuit is controlled as in Fig. 3.

When a subscriber calls, the control relay set or group according to FIG. 3 is connected to the call line via any apparatus, which may be a line searcher. Relay A works, whereupon the selector switch, which is permanently assigned to the control relay, is prepared for work by extending the earth via the negative and P-lines. The ground on the negative line operates the first control relay VR corresponding to relay 74 in the above description, which sets up a locking circuit for itself from the private line P at contacts vr i. The armature lock on the relay VR allows the associated drive cam to easily revolve into the second holding position, and if the relay A collapses at the beginning of the first current surge, the relay VR in turn trips and releases the drive cam. Under the action of the spring, this continues to rotate and comes into engagement with the roller and then completes one rotation independently of the control relay, as already described. With the next and subsequent pulses in the series, the primary slide is actuated in a similar manner and moved forward by a number of steps corresponding to the number selected. From Fig. 3 it can be seen that relays B and C are kept in operation during the series by their delays. Relay B monitors the connection and maintenance of the grounded P-line, while relay C keeps the Z-line open in order to prevent premature actuation of the trip relay ZR, which is connected to the Z-line during the first primary step due to the mechanical action of the normally closed contacts N. i of the switch is connected.

At the end of the first series of impulses, relay C triggers after its slow tripping period and energizes relay ZR, which lifts the switch arms 3. to the relevant stage of the contact set, and forms an operating circuit for the secondary control relay RR at contact zy2. During operation, this relay locks the relay ZR to the contacts rr i and also triggers the locking lever on the secondary drive cam, which engages with the inch. In this case, the locking lever arrangement between the extension of the armature of the secondary relay and the drive cam is not of a centrifugal force type, so that it receives movement until it is activated by the triggering of the relay RR and the subsequent introduction of the tip of the extension of the armature into the plane of the stop of the operating cam is interrupted. The associated spring, which detects the drive, periodically supports the maintenance of the movement. The secondary slide moves forward step by step, taking the primary slide and the contact arms attached to it with it and introducing them step by step into the selected stage of the contact set. In the first secondary step, the secondary step contacts NR i and NR 2 are operated mechanically, so that the holding circuit of the relay VR at contact NR 2 is transferred to the P line and locked for the remainder of the call via the resistor VRR.

At the end of each secondary step, the operating current of relay RR opened by the breaker contacts r i. This happens during the procedure the secondary drive pawl with the secondary rack. When this happens, will the secondary winding of this relay, however, via a friction search switch arm P. connected to the corresponding line of an outgoing trunk line. If a search line is occupied, it is terminated so that the relay RR remains held and the secondary slide is moved to the next set of output lines.

When a set of output lines is free it becomes the P-contact arm not ended, and the breaker contacts r i de-energize the relay RR quickly, so that the pawl falls on its anchor in the position in which it does the secondary movement interrupted, the movement cycle of the cam is ended.

The relay ZR is now triggered and drops the switch arms, so that their tips sink into the contact sets of the selected contact set and press the moving contacts against the fixed contacts in the contact set. Through this the calling party and the battery-powered relay set will be on the following Voter stage switched through. This can either be a line selector or a be another group voter level. In the latter case, the process is as already described. In the first case, the operation of the battery-powered relay set is the same as described, but with the exception that it occurs twice while the circuits are running are modified from those in FIG. In detail these circuits will be described later with reference to Figs.

If the calling subscriber now hangs up, relays A and B in the tax rate trip, and the interruption of the earth from the P line triggers relay VR , whereupon a working circuit for relay ZR again via contacts vr2 and NR i is closed. The switching arms are lifted out of the contact set again and, as described earlier, the primary and secondary carriages are now released to return to their normal position under the action of their springs. The mechanically operated springs also return to their normal position, and the relay ZR is triggered at the contact NR i, so that the selector is ready for use again.

As for the next voter, his primary control relay is his or her primary control relay in the election has been operated via the negative lead, and when releasing relay A, the Control relay released and initiates a single primary step. When the relay B trips, relay C trips the following relay B, and the selector trip relay is energized and actuates the secondary control relay, whereupon a bound secondary movement begins. If the switch arms hit a free output line or if they get there to the i i contact, where contacts are actuated according to the contacts S i (Fig. z), so the secondary control relay trips, interrupts the drive and triggers in turn the trip relay off. The trip relay opens when it returns to the normal position the holding circuit for the primary control relay, which during the secondary movement was held, and the latter de-energizes the release magnet when it returns to its normal position, whereupon the switch in the same way as described for the previous voter, returns to the starting position.

If all output lines of a stage are occupied, the Switching arms in the eleventh position, in which contacts S i are operated mechanically and open the circuit of relay RR to the secondary movement in the same way to stop as with a free output line, so that the switch the control relay set switches through to the eleventh contacts of the contact set. It should be mentioned that the positive eleventh contact is permanently grounded so that the earth is via the positive lead is returned to the control group, which responds to this, and the return a busy signal to the calling party in a manner to be described later initiates. If a spin count is to be provided for the stage, so could these are connected to the P contacts of the eleventh stage, and the actuated Contacts S i could, in the manner of a switching combination, connect the earth to the frictional Switch on switch arm P to operate the crank counter in this state.

Let us now consider the battery test types of selector switches, in which the freaking out is not due to the absence of the earth, but by one negative current is displayed. Such switches usually include more Relays than those working with earth potential, so that the drive cut-out relay does not works fast enough because of the increased weight of the switch, so that usually a safety gear must be provided for him. In the present case, however no more relays than usual are required, because the drive interrupt relay can lie in the control control set, while the switch contact sets themselves the Exercise switch functions.

The circuits of a battery test group selector with ten levels and ten output lines per stage (io / io) (Fig. 6) of a normal exchange dialer (Fig. i) and an io / io-3, multiple line selector (Fig. 8) for an extension with extension groups from two to ten lines should now be used in conjunction with the control relay set Circuit described in accordance with Fig. 9 «-earth.

The circuit arrangements of this relay set are such that they are independent whether the secondary movement of a switch under selector surge controls or in response to an initial drive, the secondary cam triggers a simple ratchet. This characteristic could also be due to the primary movement Apply when the primary control relay would not also serve to control the Have the switch held by the P-line after the secondary movement commenced and the subsequent return triggers the switch.

When checking the circuits of the battery-powered control relay group 9 it can be seen that the ordinary A-B-C surge group in the basic circuit of Fig. 3 is replaced by the speed-time surge circuit according to the British Patent 54.9 047. This was done to prevent the use of the normally tuned Avoid relays B and C and also because the usual standard surge procedures have reached the limit of their usefulness, as evidenced by their growing use results, which are now electromechanical pulse regenerators at Telefonämtersy stones Find. In the case of speed timing arrangements, the surge speed is on Position of the current impulse ratio measured as before, so that the line values, which disturb the pulse ratio, but not their speed, now almost can be neglected.

The speed timing circuit consists of a single timing circuit with a capacitor QD, a resistor Y0 and a neon tube NT and serves to compare the total length of the opening-closing period of each current surge of a received series with a predetermined period on the order of 150 ms, which is essentially the total length corresponds to each current impulse with the impulse speed permitted in practice by Beringst.

The circuit opens at the start of the first surge in a series actuated and restored to its original state by each subsequent current surge in the series State brought back until the last surge is absorbed, whereupon the circuit either initiating the release of the connection or the circuit in question Switch on for the other required functions, depending on whether the impulse series with normal or activated impulse relay ends.

When a calling party is switched through to the control group, the relay AA works and actuates the relay BR on the contacts aa i, while the contacts aal quickly charge the capacitor QE via the resistor YM to the office battery voltage. When the relay BB works, it applies a monitoring and holding earth to the contacts bb7. To the incoming P-line and switches to the contacts bb4. the ground potential to the outgoing (right) negative line in order to operate the primary relay i VR in the first group selector, which is assigned to the control group whose circuit is shown in FIG.

According to Fig. 6 interrupts the relay i VR, the contacts i vr i. The Se'heinwi resistance via the resistor YA, which for -usually with: the line P is connected to indicate @ that the switch for a previous test switch is free, if such a switch is used. The armature anchoring of the relay i VR allows the associated drive cam to revolve into the second setting, so that the switch is now ready to receive a series of current surges.

In the meantime, the working relay BB at bb 2 has connected an exchange signal via the common line DTE to the middle winding of the relay AA , and the exchange signal reaches the incoming voice lines by induction and via them to the calling subscriber.

When relay AA trips on the first surge of a selected series, relay E energizes in series with relay B, which is thereby held. The working relay E switches on the relay MD at e 4, which at md 3 interrupts the official sign circuit and locks it to earth via the contacts md i, d 3 and bb 5 . The contacts aal allow the discharging of the charged capacitor QE through the relay HR, which operates. The size of the capacitor is set so that the contacts ltr3 in the earth circuit for negative wiring interrupt this circuit for a period of time that is sufficient to trigger the selector relay i VR and thus release the drive cam so that the selector can perform a primary step hears. This somewhat unusual type of pulse repetition, which is exactly a different type of regeneration, is used in connection with the simple secondary locking lever release control mainly to ensure that: this movement is controlled by the selected current surges or acts independently in a functions required of them. The details of this procedure will be given later.

When relay AA is working again at the end of the first rush current, relay BB remains held across relay E in parallel with resistor YL. Under Liesen circumstances the relay E also remains in operation, and the capacitor is charged QE eel quickly .the resistance YN at the contacts. The second opening pulse in the series therefore activates relay HR for a short period of time in the same way as for the first, and the earth circuit via the negative line to selector relay i VR is briefly opened for the second time, whereupon the voter performs a second step. This happens for each subsequent current surge in the series until at the end of the series the relay remains in operation for the relatively long interruption period between two numbers.

During this period, the voter initiates the secondary movement. Pulse speed time measurement circuit in the following way: When the relay E is actuated for the first time, ie at the beginning of the first recorded opening current impulse, E 3 becomes positive via the resistor Y0. Pole of the battery has prepared a charging circuit for the speed time capacitor QD, and when the relay HR trips after the momentary opening pulse has reached the selector, the capacitor QD begins to charge. The corresponding values of the resistance and capacitance, to, rs are such that the capacitor needs about 150 ms to reach the response voltage of the neon tube. In precise terms, the charging time is 150 ms, minus the actuation time of the relay HR, which operates for a given period of time at the beginning of the opening period of each current surge received.

If the second opening period is received before 150 ms have elapsed since the beginning of the first opening period, then the relay HR works again and quickly charges the capacitor QD via the resistor YM via the resistor YM, and the rapid charging of this capacitor Relay HR triggers Discharging and charging of capacitor QD takes place for each current surge, until at the end of the series the relay AA remains in operation and thus the voltage of the capacitor QD decreases the response voltage of the neon tube NT i5o ms Beginning of the last opening current surge of the series reached.

When responding, the neon tube NT switches on the relay ZZ, and this relay switches its upper winding in series with the resistor YM and c2 and interrupts the relay E in its contacts cc i, which slowly begins to trigger. At the contacts. CC 2 , the battery is connected to the line Z via the winding of the relay D, and since the primary step contacts i N2 of the selector are closed when the switch works step by step in the primary direction, the battery voltage is applied to the combined tripping magnet and relay i ZR connected. The relays D and i ZR work under these conditions.

During operation, the relay i ZR lifts the switch contact arms out of the step contacts., in. which they had been pushed out and operated on the contacts i zr i the secondary control relay i RR from the grounded negative line to a closed secondary drive movement of the switch to search for a free output line to initiate a subsequent switch.

The relay i RR initiates the release of the pawl from the secondary drive cam during operation and switches the relay i ZR on, the contacts irr i. the battery through the resistor YC. In the first secondary step, the secondary step contact springs i NR i and i NR 2 are actuated. The former switch off the initial working circuit of the relay i ZR, so that the relay D trips in the control relay set, without having caused any circuit operations in this stage. The holding circuit for the relay i VR is transferred to the grounded P line to the contacts i NR 2.

The contacts i zr2 switch the abrasive test arm RW i on the positive line through and from there via the resting contacts f 7 and h7 nd press contacts and CC5. the resistance YQ to the upper action of the shutdown relay HR.

When the test arm RW i meets a free outlet line like her is indicated by an impedance, as is usually the case with the P-wire this switch is connected, the relay HR works quickly and disconnects at the Contacts hr3 the earth potential, which is carried to the negative line, whereupon the relay z RR trips to stop the switch movement, and on the contacts i rr i the relay i ZR is de-energized to bring the switching arms into contact with the contact set to bring and so switch through the control relay set to the following selector stage. For reasons to be described later, the control group relay H does not have enough Time to work at this stage.

The secondary drive disconnect pins i ri operate in the same Way as described earlier for the earth testing groups.

Turn around. if we now go back to the control relay assembly, it can be seen; that when the relay CC is actuated. To initiate the secondary movement, it remains locked, either until the end of the slow release time of the relay E; when the interlock circuit is connected to the. Contacts e i, or until termination currently; which will be required to find a free trunk line if Circuit at contacts hr i is open, whichever is longer.

If the relay i ZR is switched off in order to switch the control relay set through to the next selector stage, the contacts i zr2 open the output test circuit and thus release the relay HR in the control relay set, whereby the following selector, which is in use, is connected to it via the P -Wire is monitored by the control relay set. When releasing the CC relay, the control record is ready to dial the next number; to control the setting of the following selector now in use. If the participant should hang up now, relay AA collapses and relay E is operated in series with relay BB, which holds. Capacitor QE is discharged through relay HR and therefore sent down the negative lead to the next voter by a single surge. Approximately 1 50 ms after relay AA is triggered, the speed time limit circuit comes into operation, whereupon relay CC operates, and since relay AA is now normal, the holding circuit of relays E and BB is turned off and the first starts to trip slowly due to its inertia , while the latter solves relatively slowly due to its non-inductive resistance circuit with the resistor YN. When the relay BB is triggered, the interlocking circuit for the relay CC is opened at bb i, and when the relay E is triggered, the holding earth is removed from the P line via e7, the relay i VR, which. was previously held, is now triggered and at the contacts i vr 2 a. Re-actuation circuit for the relay i ZR closes, whereupon the group selector is triggered in the same way as described earlier for the Erdprüfgruppenwähler.

What the. subsequent. Voters are concerned, so his first control relay is actuated via the negative line after its use and by releasing the. Relay AA the momentary opening in the earth potential is connected to this line, whereupon the primary control relay triggers and initiates a first primary step. i5o ms later the relay CC, and works. During the slow release time of the relay BB, the battery voltage is brought to the Z line via the winding of the relay D to switch on the release relay Time has been replaced. The switch now swings in and completes the first secondary step. If the relay BB trips during this time, then it can be seen that the corresponding breaker contacts trip the trip relay, whereupon the incoming line on the voters to the set of. Output lines is switched through, which it is opposite. It should be noted, however, that since only relay BB is normal, the negative lead in the control group will be cut off. the P-line and the tripping relay are energized again and initiates the tripping of the switch :.

Let us now turn to the group selector according to FIG. 6 again. If all outgoing trunk lines have been found to be occupied, the secondary movement is continued until the test arm Rgr i reaches the eleventh contact, the P-contact of which is connected to a resistance battery, so that the drive cut-off relay HR works and the secondary control relay i RR triggers and thus interrupts the rotary movement. At this time the relay E has been triggered, and as a result the operating relay HR triggers the relay CC on the contacts lar i . In the selector relay, i RR, the relay i ZR is triggered when triggered, whereupon the contacts i S i of the eleventh contact set take effect and bring the earth back via the positive line to switch on the relay C in the control group. The relay G switches during operation. Contact gi and closes an exchange signal earth at contacts g2 via the common line BTE to the middle winding of the relay AA, from which it returns to the calling subscriber.

As for the eleventh P-contact, its output P-contact permanently connected to the resistance battery. It can therefore be seen that the incoming P-contact of the additional contact switch pair has been removed, so that, if, the Contact arm when the relay i ZR is triggered, the output contact does not is grounded by the control relay set and therefore further selectors are connected to the same battery can be switched on. When releasing the relay i ZR, the contacts are also i S i of the first step take effect and connect the earth. a spin counter at; which with the positive output contacts of the contact set in the eleventh step connected.

It should be mentioned that when controlling a group selector, the the test arm RW i determined negative battery, if then a free switch is present, is removed about 10 ms after actuation of the relay HR, d. H. when this selector relay i RR and i ZR trips in turn and the relay HR trips for this reason receives a locking circuit via contacts cc4 and lar2, about triggering. of relay CC. in the event that during a second search movement the relay E should not trigger before the relay HR im Responding to finding a free output line. The switch relay H, one winding of which is in series with the working winding of relay HR, is given a working time that is longer than this io-ms period to ensure that it does not work when the tax rate regulates the setting of a group selector. Under conditions where the tax rate regulates the hiring of a trunk manager, receives the control relay H enough time to operate as described later.

Assume now that if. the group voter has been selected is, the participant hangs up without voting. In this case, it becomes a series of rushes generated by a single surge, but relay AA remains at the end of the pulse normal. The voter is triggered using exactly the same lines as that of the subsequent voter if the calling party hangs up after he only chose one number.

It is now assumed that the following voter put into operation is a regular line selector, the circuits of which are shown in Fig. 7, from which it can be seen that the switch part of the contact set is the same as in Fig. 6 is. After the claim, the primary relay becomes 2 VR actuated, and the preliminary work of this switch up to the excitation of the trip relay 2 ZR at the end of the first series of received bursts is the same as for the group selector of Fig. 6. The working relay 2 ZR connects the secondary relay 2 RR with the grounded negative lead; however will. in this case, since the relay 2 RR with connected to earth rather than to the battery, this relay held normal as a result the dissipative effect of the earth on the negative line, with the earth also doing so serves to hold the lifting relay 2 VR. As a result, there is no automatic secondary movement instead, and the control group relay D remains in series with the relay 2 ZR.

When the next series of power surges received by the control group then each time the relay HR works for a short period of time at the beginning the opening period of a rush current, and the negative lead earth connection is replaced by a battery connection across the resistor P, and the secondary selector relay z RR is actuated for each pulse received for a period of time, which from, the working time of the relay HR is kept.

It should be remembered that the secondary drive cam is a simple one Ratchet release ha, t and there was therefore selected current surges to act on him can and it is necessary to ensure that the control relay 2 RR after it has been actuated by responding to a control surge, in good time has been triggered to bring a stop to the path of the secondary cam, before this cam has completed the half revolution, which is necessary to the Shift rods. to take a step forward. For this purpose the length of the secondary impulse, as regulated by the HR relay, is set smaller than the 30 ms period which is required for the cam to turn half a revolution accomplished. Each subsequent push corresponds to the first, so that the sledge took pace is dialed into the contact set step by step.

In the control group, the relay CC conducts at the end when it is working of the first series of amperages causes the relay E to trip slowly while the relay BB is held. An interlocking circuit of the relay CC is actuated by the Contacts d i open so that when the relay E after its slow trip period trips, the relay CC immediately returns to its: normal state and the circuit is now ready for the next selected number.

When the relay CC works at the end of this next number, the open test relay HR and the switch relay H are connected in series via the positive line and from there via the contacts 2 Zr 2 and the test arm RW i to the P-conductor of the called subscriber.

If the called line is free, a resistance battery will be used placed on this conductor, and the relay HR works with it in series. The difference from the group selector can in this case, there, the selector relay 2ZR on the relay D is switched, the relay HR does not trigger the relay 2 ZR during operation, and as a result, the switch relay H is given time to during the slow trip of relay E, which started again when relay CC was actuated, slowly again trigger. Lead at all public line selector switches (ordinary and. With extensions) three lines. to the line circuit of each participant and connect the negative and positive contacts of the output leads of the contact set with the corresponding ones negative and positive lines of the line circuit, while the private lines the subscriber with the Z-contacts of the outgoing lines, of the contact set are connected and the P contacts of the outgoing. Lines, of the contact set are not connected. If. therefore the relay H works, the contacts close h5 earth via the Z wire to short-circuit the line selector relay 2 RZ and so to switch the control record through to the line of the called subscriber. the Earth is also connected to the private line of the called subscriber via switch contact sets on, closed to mark this line as busy and such, the necessary Control in the subscriber's line equipment to effect the incoming Receiving a call .. The connection to the private line of the called party takes place initially, via the switching arm R W i and then, if. 2 ZR triggered is about the main contacts.

Contacts h4 and k7 connect a grounded paging machine GNR to the negative via the winding of relay F. Line and a paging machine via the line RRB and the resistor YS to the positive line to the. to ring the called subscriber, while the contacts h2 connect a call signer via the line: RTE with the winding of a relay AA , from. where the callsign to the calling party. Party returns.

When the called subscriber answers, the relay F works and removes the short circuit from its right-hand winding on the contacts fi, via which it locks, while on its contacts, f 6 and. f 7 the call is stopped and the battery-powered relay D at f 4 and f 5 via the outgoing. Lines are switched through to the calling subscriber. The conversation can now begin.

It should be mentioned that, although the relay D was actuated before the final triggering of the relay E, the opening of the contact d3 has no effect on the relay MD , since this was held via the contacts h i and 94. If either the relay G or H is actuated when testing a subscriber line, the relay D drops out; before enough time has passed after the de-energization of the relay E to allow the opening of the contact e4 and thus to allow the de-energization of the slowly releasing relay ED and an opening of the contact md i. If the relay D works, the relay AID trips shortly afterwards and connects a circuit from the battery to the contact md'2 via the resistor YR, the contacts and2 and the contact f 2 to the counter line 3IT to operate the counter of the calling subscriber .

At the end of the conversation, when the calling party hangs up, the relay AA triggers, whereupon the relay E works in series with relay BB, which holds. The speed time current comes into operation, and 15o ms after the relay AA has been triggered, the relay CC comes into operation and initiates the slow triggering of the relays E and BB. By tripping the relay BB will be; the relays H, F and D triggered while. by tripping the relay E, the holding earth is removed from the P-line, and the various primary control relays in the voter train which have been held by it. are released so that they turn on their trip relays and thus initiate the tripping of their respective switches.

It is now assumed that the line requested turns out to be busy proves. Then the relay H does not work during the tripping time of the relay E, and when relay E trips, relay CC drops and connects relay G with the busy line. The relay G then actuates the one determined by the test arm RW i grounded private line of the subscriber and sends the busy signal to the contacts g2 back to the calling party, while the circuit to the Connection of the battery voltage via the winding of the relay D to the Z line is open and the tripping relay 2 ZR of the line selector then trips. The switch arms The line selector will then be lowered into contact with the contact set, however it should be mentioned that a disturbance is switched on against the busy subscriber the separation in the control group of the negative, positive and Z-wires on the contacts g 5, g i and g q., which at all trunk switches with the trunk dialer contact set the negative and positive P-lines of the subscriber are connected. The P line from the control group and through the selector series to the line selector remains grounded, to hold the series of voters until the calling party hangs up, and there the P-line not. runs through the line circuit of the participant, it can do this without disturbing the called party's line.

It is now assumed that the last two numbers dialed act on a two- to ten-line private branch exchange dialer according to FIG. The primary and secondary setting of this switch is the same as for normal line selectors, however, if the secondary control relay 3 RR is triggered by the control group at the end of the last series of pulses, the relays HR and R are switched in series to the positive long-distance line and operated from here via aie Contacts 3 zr2 and the dormant contacts 3 rr i. The RTV i test arm and the contacts rest on the private wire of the line circuit in the desired extension group on which the switch arms of the line selector have been set. The contacts touched by RW i are connected to the outgoing contacts, which are switched through on the subscriber's private wire like a regular line selector. It should also be mentioned that the Z-wire is switched through to a corresponding contact of an auxiliary contact set via the step contacts 3N2, the capacitor QA, the contacts 3 rr 2 and the friction contact arm RW 2. The auxiliary contact set, which is only used for test purposes, includes the outgoing P-contacts, which are usually not connected to the line selector, while the outgoing Z-contacts are switched through to the subscriber's private lines. The first lines of the extension groups are marked with superimposed alternating current by means of a battery source. The outgoing P and Z contacts are stored on intermediate lines, while a resistor battery is connected to the last line.

When the switch's contact arms are on the first line of an extension group aligned across the AC power source connected to the battery switch arm RW2 back the circuit via capacitor QA and the Z line and the relay HS with its left-hand winding in series with the resistor YP, though this winding of the relay HS is assigned a capacitor QF and an amplifier HRA in order for it to work satisfactorily on alternating current. If the relay HS works, it holds a sliding circuit for the relay E at the contacts hs2, so that the Relay CC in turn locked after actuation by the speed timing circuit remains while the battery voltage is connected to the contacts hs i its other winding prepared for the negative lead.

If the line is found free by the test arm RW i, the Battery voltage of the free line switched back via the positive line, to operate the relay HR. In this case the relay HS remains ineffective because the circuit to the negative line at contact hr3 is open. The relay H, which works after actuation of the relay HR switches in the connection already with the line selector described the extension line selector on the first line of the extension group through after the callsign in the already described manner has been generated.

If, on the other hand, the line is busy, the relay HR does not work, and the battery resistor connected to the negative line via the right-hand winding of the relay HS actuates the secondary selector relay 3 RR so that the switch automatically checks the lines in the group: It should be mentioned that at actuated relay 3 RR at the contacts 3 rr i the positive wire from the test arm RW i to the switch arm RW2 is switched. In the case of intermediate lines of an extension group, the assigned P and Z output contacts are shortened, as will be remembered, so that the control group can still check the private lines of the subscriber in the group during the movement. It should be mentioned that the AC circuit can work independently of the DC and holding circuit for the relay 3 ZR via the contact arm RW2, since it is separated from it at the selector by the capacitor QA and at the control group by the capacitor QF. If a free intermediate line in the group is occupied, the relay energizes HR and triggers the secondary control relay 3 RR to stop the movement. The relay H works and then acts in the manner already described to switch the lines through.

If the first and intermediate lines of the selected extension group are busy, the selector switches on a battery resistor when reaching the last line on his contact arm RW2, which marks the last line of all extension groups. Accordingly, the relay HR operates via the positive line and via the actuated contacts 3 zr 2 and 3 rr i regardless of the state of the corresponding lines. The corresponding output contacts P and Z are of course not connected to the last line of the extension group. During operation, the relay HR opens the locking circuit of the relay HS at the contacts hr 3 , which, when triggered at the contacts lzs2, opens the holding circuit for the relay E, which slowly begins to trigger. The interruption of the battery through the winding of the relay HS to the negative line, while the relay CC is still held by the relay E, causes the secondary switch relay 3 RR to trip, so that the relays HR and H in series across the positive line with the test arm RW i and from there connected to the private line of the last participant in the group so that when the line is free the relay H operates to establish the connection with the called line. When the line is busy, the relay H does not work, but the relay HR remains held via its lower winding to the battery via the resistor YM. When relay E is triggered after its slow release period, relay CC does not work and releases relay HR, while relay G is connected to the positive line at contacts cc 5 and then the occupied earth potential found by test arm RWi with the one already described Determines result.

In the case of a special outgoing line of an extension group is required, such as B. night duty, provided that this is not the first Line of the group is, if the extension dialer responds by dialing, no checking of the extension take place if it is busy, since the relay HS is not has been operated. In order to meet the conditions necessary for the extension check create, the operations that result from it are the same as for one normal line selector when a busy output line is detected.

It should be noted that the circuit of FIG. 8 for a switch Which can be used as a group switch, line selector or extension line selector can work by simply making the appropriate connection with the from contacts touching the test arm, and in the case of a group selector arrangement, since the Test arm RW2 touches a normal contact connected to an alternating current, is fed in series with a battery like the first contact in a group.

Further points and additional features both in relation to the selector switch as well as the control groups will now be discussed.

As mentioned earlier, the outgoing Z-contacts of the Contact set in the line selectors, the P conductors of the subscriber circuits so, that if the control group switch earth via the Z-wire from the contacts h 5 connected to the P-conductor of the subscriber in question, the Z-wire through the control groups and the line voter is passed through without a branch or series resistance, so that various facilities, such as. B. a transmission lock, which was originally reserved for the line voter, now in the control groups can be provided.

If the circuits of the regular line selector and group selector according to FIGS. 6 and 7 are checked and compared, it can be seen that there is no reason why the line selector circuit cannot be used with a group selector, provided that the Z-circuit is open in the control group is to trigger the magnet 2 ZR through the relay HR when it opens the circuit for the magnet 2 RR on a free line found. Certain other changes are necessary in the control group in order that the relay HR opens the circuit of 2ZR only at the end of a series of pulses or at the end of the test. Such circuit changes avoid the need to maintain circuit 2 ZR through 2 ZR 3, and the circuit according to FIG. 7 can be simplified by connecting 2ZR directly to 2N2. It is obvious that it is impracticable to show all the changes that are possible, and it is only suggested that general guidelines be given according to which the changes can be made, since any person skilled in the art can then easily make the necessary amendments. If z. B. the primary movement has ended, the relay 2 ZR is operated as before, and the control group is arranged so that it is connected to a resistance battery via the negative line to operate the relay 2 RR via contacts, of which the primary relay 2 VR is temporarily held until the secondary drive begins and the actuation of relay 2 RR leaves the secondary drive. When a free line is reached, the shutdown relay HR works on the positive line as before and therefore opens the negative line to drop relay 2 RR, and in this example the Z wire is also opened by contacts of relay HR, to trigger the relay 2 ZR and thereby cause a through-connection to the following switch. In the case where the control group operates in a line selector, it will operate almost exactly as shown and described.

In the case described with reference to FIG. 8, it is possible to use the Insert switch mechanism in any position in an office, and it will be automatic work in the manner requested by him, d. H. as a group selector, as a line selector or as an extension dialer. In the case of FIG. 7, it has been explained how this Circuit suitable for use either as a group selector or as a line selector can be made, however, in this case there is some degree of distinction necessary. This distinction can take two forms: One due to the change of the control group's circuit according to the one sent back to the control group ordered signals according to the type of switch used, so that the work of the control group is appropriate in any case of the type of switch, which is controlled while the other form a modification of the on one or more Magnetic relay affects the switch's applied voltage when the switch is in its Position is moved, z. B. when the relay z RR in a case to the battery voltage is connected and 2 RR to earth if the winding of r RR or 2 RR with a pin of the pawl was connected and with a clamp in the contact set comes into engagement. This terminal could be grounded at a line selector and connected to the battery in the case of a group selector. The amendment in the first case, with z. B. a resistance can be achieved, which in the The switch pawl of the group selector and not the switch pawl of the line selector or vice versa is switched on. If one proceeds according to the guidelines indicated, so it follows that an identically decreasing selector circuit for both group as well as line voter is used, in which case each voter in office either can perform its secondary movement automatically or under the action of the chosen one Electricity surges, depending on the change in the ratchet.

A group switch can also be set up so that it is in works the same way as an extension line selector; H. with an elected Secondary movement. This option can be used in conjunction with the test and set-up function and especially used for long-distance lines, e.g. B. can the voter either call to check the contacts of the first contact set, or he can can be selected in a certain position to the contact set and from here the Perform audit. Another point arises in connection with the selector switches according to the invention. They can be set up for self-running monitoring, as each voter from the driving role the required series of electrical surges can control with a ratio of ten per second (decade selection). A release button at the front of the selector could the power surges on the primary control relay transmitted and the switch respond to it and in the primary direction for example switch to stage g, where mechanically operated springs would energize the trip relay, to make the switch perform a secondary selection process until the contact g is reached at this stage. Further springs would then be actuated to initiate the switching movement to stop.

It should be noted that no extension group with more than ten Lines was mentioned. Such extension groups are exceptions. In such In cases it is suggested to use voter units that have up to a hundred lines and which by connecting one or more auxiliary relays are able to Perform exams across a stage, then trigger and go to the beginning of the stage can be returned and switched to the next level, where it is another Carry out dialing, etc., a method that a secondary trigger without the previously described primary trip is achieved.

Regarding the control group, it should be mentioned that speech transmission capacitors not be switched into the circuit until the impulse has ended, so that the disturbance usually caused by this, which is particularly the case with Impact occurs over long connections is not applicable.

At this point it is useful to briefly review some of the circuit facilities to explain which are currently in common use and which apply to the new system Can be used: First of all, the special trunk line selector be replaced by ordinary line selectors in the new system. These voters are controlled by special control groups accessible to the officers. at the line voters described earlier will be remembered when the demanded Line is busy, the contact arms are still connected, although the necessary one Separation in the control group is provided. If a special control group is used by the officer for long-distance traffic, this group can be the separation between Bridge capacitors when the called subscriber is busy.

With regard to the disturbance, it is possible to make all the simplifications of this Kind of let the control group perform as the participant's P-wire is carried out via the Z-wire through the voter series. The line selector Z contacts are connected to the subscriber P contacts. The same remarks apply to the long-distance call sign, inadmissible holding of calls, disconnection of the last participant etc. The other major genre of simplification is that which usually connected to the first group selector.

Claims (4)

PATENT CLAIMS: i. Automatic telephone system with switches with a contact set and a control mechanism on which circuits for control of the switch, the control mechanism of the contact set by means of a ratchet assembly by moving over contacts from which the circuits exit for control, is separated, characterized in that the contact set consists of pairs of interacting contacts in the lines (P, -, Z, -I- 6 on the right) of each outlet are arranged corresponding sentences, and that the associated contacts of each pair first immediately without any intervening Contacts to the incoming lines (P, -, Z, -I- in Fig. 6 left) and on this can be connected to the contacts of the pawl (71) to establish the control circuit train so that the speaking circuit formed by the switch does not go through the contacts of the ratchet assembly runs. 2. Automatic telephone system according to claim i, characterized in that the circuit wiring of the control mechanism (left half of Fig. 6) to a set of contacts of the ratchet assembly connected and adjustable in a certain way depending on the effect is while the circuit wiring of the contacts and the connection of the other Contact set of the ratchet assembly regardless of the effect of the switch remains the same, with the complete circuit wiring for the controller of the switch is completed when both sets of contacts of the ratchet assembly are connected to each other. 3. Automatic telephone system according to claim i or 2, characterized in that a rotatable shaft (47) as a continuously acting mechanical Power source for driving the switch arms (53, 54) is used in the same step and that a unit of these contact members (control magnets 74, 75) and a special one Control circuit (Fig. 6, lower half, Fig. 7 and 8) for switching on the ratchet assembly is provided so that the unit is connected to the switchboard and the rotatable Shaft is set up exactly with the coupling members (48,49) through which the uniform movement of the shaft in gradual movement of the aforementioned Contact members is converted. 4. Automatic telephone system according to claim 2, characterized in that a battery-fed control circuit (Fig.9) for Controlling each row of switches (Fig. 6, 7 and 8) by means of interaction Control circuits is provided.