Патент USA US2134626код для вставки
Oct. 25, 1938. E. SHIPTON ET AL » ' IMPULSE 7 TRANSMITTER 2,134,626 ‘ > Filed Dec. 12, 1934 . 5 Sheets-Sheet‘ 1 .24 33 11 A 15.26 22 22 4-5-67 2 23 23 22 23 , g2: . % w.” 87 34 i . izga-nué, ATTORNEYS Oct. 25, 1938. E. SHIPTON ET AL 2,134,626 IMPULSE TRANSMITTER Filed Dec. 12, 1934 F ‘b c rI r I j 5 sheets-sheet 2 ‘q a’. 17 15 F16 H ‘7 ‘50 a‘??? 12 © 1? Ii 20 21 I [ PM: H ,?il ' .52 i - _ mid @ 5F , . ~ @ _ 5,K--F[Z-8--71\ “I51 I 60% mm“ 7' N: j 1“?A‘ 5/ ~ _ ' _’ \65 7; 9 66' M' ~ * — £1; EtETJQFIQI-FPIIPI' w W w ft; . ' my /Nl/E/V7_ORS r TORNEFS ' Oct. 25, 1938. E. Sammy“ ETA]. ‘ , 2,134,626 IMPULSE TRANSMITTER Filed Dec. v1.2, 1934 ' 5 Sheets-Sheet‘ s _ WW‘ #Zwg ATTORNEYS ' Oct. 25, 19.38. > E. SHIPTON ET AL IMPULSE ' 2,134,626 TRANSMITTER Filed Dec. '12, 1934 v ~ 7 I 5 Sheets-Sheet 4 Hg; 23 M4, T ‘ 2% 2,: ATTORNEYS ‘ Oct. 25, 1938. E. SHIPTON ET AL 2,134,626 IMPULSE TRANSMITTER Filed Dec. 1?, 1934 TjMNPRS ___ ___ 103 5 Sheets-Sheet-S __ ABCD .1: JHK|LM 2 73 NVVENTORS ATTORNEY/5 2,134,626 Patented Oct. 25, 1938 UNITED STATES ‘PATENT OFFICE * 2,134,626 IMPULSE TRANSMITTER Edward Shipton, London, and Oscar Douglas _ Kennedy, Burnham, England Application December 12, 1934, Serial No. ‘757,245 In Great Britain December 12, 1933 8 Claims. (Cl. 179—90) The present invention relates to impulse trans; looking at the letters and numerals displayed in mitters for automatic telephone systems or the the various windows, the calling subscriber can see the called number which he has set up. If, like. ' The impulse transmitters hitherto employed desired, in addition to or instead of setting up 5 have generally been of the dial or ?nger hold numbers in the windows, the setting up devices 5 type, and have the disadvantage that errors may maybe provided with pointers moving over a be easily made in selecting the required number, scale on which the numbers or letters are writ which results in loss of time in completely redial- . ling the number to be called,_ and also in expense 110 if the call to the wrong subscriber is completed. According to the present invention, a calling impulse transmitter for automatic telephone sys terms or the like comprises means for setting up the impulses to be transmitted and giving a Visi 15 ble indication thereof to the calling subscriber. After the number to be called is thus set up and ten. . . ' A feature of' the invention consists in con structing the selecting means for the impulse 10 sender so that they may be set in an easy fashion to impulse'accurately the desired number of im pulses; This may be effected by ‘providing a spring pressed member adapted to engage in an indentation so as to locate the selecting means 15 in the 'correct position. Alternatively, the se can be seen by .the calling subscriber to be cor- 1 lecting means may be so constructed that accu rect, a calling lever, button or the like is oper ated to send out the calling impulses. The oper 20 ation of this calling lever or button, can restore all the setting up members to zero. Preferably, however, this action does not take place, the set ting up members remaining in the same position after the calling lever or button has been oper25 ated.’ 1 . - It will thus be seen that with the arrangement according to the invention there can be no possi bility of the subscriber accidentally calling the wrong number. Moreover, the arrangement has 30 the advantage that, if the same number has to be called a second time, the setting up means is already set and it is thus only necessary for the calling lever or button to be operated, thus re sulting in a saving of time. Further, in several 35 cases it is not necessary to alter all the elements set up and in such cases less operations than are necessary with the ordinary dials need be effected to complete the call. Another advantage of the (arrangement is that it is possible to preselect a 40 call; for example whilst still talking on one call a second call may be set up and impulsed out immediately the ?rst call is ?nished. According to one embodiment of the invention, the arrangement comprises a number of setting up means corresponding to the number of groups of impulses to be transmitted in effecting a call, for example, when calling with seven groups of impulses, the?rst three setting up devices may represent the ?rst three letters, and the remain; 50 ing four setting up devices the four digits of the number to be called. Each setting up device com prises a knob, thumb disc or the like, and,’ on moving the setting up device, the letter or nu meral selected appears in a-corresponding win dow or aperture in the device. In this way, by rate setting is not essential, that is to say, so that there will be no fear of incorrect impulses being sent if the setting knobs or the like are 20 not very accurately positioned. . A further fea ture of the invention consists in so constructing the apparatus that the movement of the setting up devices is large compared with the movement 'of the actual selecting means thus still further 25 simplifying accurate setting of the selecting means. i In the calling systems in use in many auto matic telephone areas in which the subscribers’ numbers include one or more alphabetical num- 30 bers followed by numerical digits, e. g. TEL. 4321, the alphabetical letters are usually arranged in groups of two or three, the same number of im pulses being sent out for each letter of a group which is dialled. For instance, in the London 35 area for the letters A, B, C, the same number of impulses, two, is transmitted. Another feature of the invention, therefore, consists in arranging the setting-up devices for the letter impulses so that only one letter is indicated at a time, there being 40 two, three or more positions of the setting-up devices which transmit the same number of im pulses. This may be effected by connectingthe setting-up disc or knob with the selecting device by means of epicyclic gearing or by a lost-motion 45 connection. For example, in the case of a thumb disc and associated selecting disc, the connection may bemade by a pin and slot connection so that for several positions of the thumb disc the same position of the selecting disc is obtained. 50 The selecting disc may be sprung into position ‘ by means of a locating spring or the like. A further feature of the invention consists in basing the operation of the apparatus on cor rect timing. As is, well-known the time for 55 2 2,134,626 transmitting each impulse is one tenth of a sec number of impulses, the thumb disc is connected to its associated selecting disc by a pin 44 engag ing in a slot :35 cut in the selecting disc. The slot is of such a length that whichever of the three letters is showing in the viewing window the selecting disc is moved to such a position that the spring 23 can force the locating disc and thus the selecting disc into the correct position ond. According to this feature an impulse send er, such as an impulsing cam, is operated con tinuously after the calling lever or button is op erated and the impulsing circuit is completed, short-circuited or a short-circuit is broken at certain times in accordance with the number to be called. ' In order that the invention may be more clearly 10 understood, reference will be made to the accom panying drawings, which show by way of exam- . ple various embodiments of the invention, and in which: Fig. 1 shows a plan view, partly in section, of one form of the invention. Fig. 2 shows a section along the line A—A in Fig. 1. . Fig. 3 shows a plan view partly in section of a modi?ed form of the arrangement shown in 20 Fig. 1. ' Fig. 4 shows a section along the line B—B of Fig. 3. Fig. 5 shows a section along the line 0-0 of Fig. 3 with part of a supporting plate cut away to ing members in the form of teeth a, b, c, d, e, f, g, h, i, 7', the ?rst of which corresponds to a time period of one impulse, the second being slightly 15 longer and corresponding to a time period of two impulses, and so on up to 9', which corresponds to a time period of ten impulses. Thus the ten teeth have different dimensions corresponding to the ten numerals 0 to 9 from which each digit 20 of the numbers to be transmitted may be se lected. Each selecting disc with its ten impulse show the mechanism. Fig. 6 shows a section through a selecting disc along the line. D——D of Fig. 3. pulses at all transmitted, as will be hereinafter i 1 Fig. 8 shows a side view of a selecting disc as used in the arrangement illustrated in Fig. 7. Fig. 9 shows a plan view of a modi?cation of the arrangement shown in Fig. 7. ‘ Fig. 10 shows a section along the line E—E in Fig. 9. Referring to Figs. 1 and 2 of the drawings, the device has eight setting-up members, comprising explained. Mounted parallel with the shaft 9 is a spindle 24 which is rotatably supported in the walls Ill 80 and H of the casing and carries the wipers 25 to 32 which cooperate with the impulse control ling devices or selecting discs M to 2! respec tively. One end of the shaft 24 passes through the wall H and is connected through gearing to 85 a clockwork driving mechanism 33. The clock work mechanism may be of any suitable type and thumb discs 1 to 8 respectively, all rotatably is arranged to start and effect one complete rev mounted on a shaft 9 carried in the walls it, olution of the spindle 24 when the starting handle ii of the casing. The frontperipheries of the thumb discs project through slots l2 in the front wall of the casing, so that they can be adjusted by hand, and each disc carries letters or numer als corresponding to the digits to be called. The 45 actual digit set up at any time is ascertained by viewing it through the viewing window I3. In the device illustrated, the ?rst thumb disc I is for setting up special calls, such as for dial ling 0, or it could be used for making calls in 50 conjunction with a house system. The remain ing seven thumb discs are for setting up the seven digits of a seven-digit calling system. In the ex ample shown, the ?rst three digits are letters 55 . Each selecting disc is made of insulating ma terial and is provided with ten impulses control controlling members constitutes an impulse con trolling device. In addition there is a blank space It on the surface of the wheel, so that if 25 desired this canbe set in position and no im Fig. '7 shows a plan View of another form of the invention. 30 for transmitting the corresponding number of impulses. 10 34 is depressed. Conveniently, the clockwork mechanism may be of the type in which the driv 40 ing spring is normally wound, the act of depress ing the lever 34 causing the spring to be further .wound and simultaneously to release a retaining catch. On the mechanism rotating the lever 34 is raised by the spring which unwinds by the 45 amount which it had been wound, the retaining stop ?nally moving in the position to stop‘ the mechanism when one revolution of the spindle 24 has been made. Also geared to the clockwork mechanism is the impulsing cam 35 of known 50 construction which passes between and periodi cally opens the impulsing contacts 36 to e?ect and the remaining four are numerals. Connected and rotatable with each of the thumb discs is a selecting disc, numbered M to the production of a series of impulses each time the mechanism is operated. The clockwork 25 respectively, and a locating disc, all numbered 22 in the drawings. The selecting disc and its associated locating disc are rigidly connected to gether. The locating disc has indentations formed around its periphery (see Fig. 2), With which the end of leaf spring 23, rigidly secured to the casing of the mechanism, cooperates to speed that an impulse is produced every tenth of a second, and the required total number of impulses are produced during one revolution of the spindle 24. The time taken for a revolution 60 ensure that the selecting discs must be set accu 65 rately in position to correctly dial the desired number of impulses. If the selecting disc is not quite accurately set, the pressure of the spring on the side of one of the indentations of the locating disc moves this disc, and thus the select 70 ing disc, into the correct position. The thumb discs l, 5, 6, “l and 8 are rigidly con nected to their associated selecting discs and lo cating discs, but in the case of thumb discs 2, 3 and it which bear the alphabetical letters and in most 75 cases have three letters which give the same mechanism drives the impulsing cam at such a 55 of spindle 24 allows for transmitting ten im pulses in respect of each of seven digits plus the minimum interdigital time periods between the consecutive impulsegroups which are neces sary to allow the exchange apparatus to func 65 tion between the transmission of the successive impulse groups. The wipers 25 to 32 each comprises two spring members bearing contact points which normally engage together. Each of the springs is spaced 70 from its associated spring on the spindle by means of an insulating washer 37, and in order to complete the insulation, the metal spindle 24 is enclosed in a tube of insulating material 38 (see'Fig. 2). The adjacent springs of two dif 75 3 2,134,626 hand spring of wiper 26 throughthe metallic In Fig. 2 the'spindle 24 has been shown in a position corresponding to that which it will' as sume during rotation. Normally, of course, the wiper 25 will just be above the top of a tooth spacing collar 39 andso on for the other wipers. The extreme end springs of wipers 25 and 32 are of its associated selecting wheel so that this wiper is the ?rst one to be operated when the ferent wipers are, however, electrically connected together, that is to say, the right hand spring of wiper 25 is electrically connected to the left electrically connected to the contacting discs 40, 4| respectively, with which brushes 42, 43 re spectively contact. It will be understood from ~ through the wiper arm circuit and impulsing cam 10 the above that normally the circuit is completed from the brush 42 through the contacting, ring and the exchange line. collar 39, left hand spring of wiper 26 and so on rangement shown inFigs. 1 and 2 provide an arrangement in which the mechanism is more 15 compact. As in the arrangement shown in Fig. 1, this modi?cation comprises the thumb discs 2 to B of metal (the thumb disc I and its asso ciated setting-up mechanism are omitted in this modi?cation), which are rotatably mounted on 20 the outer periphery of supporting discs 58 car ried on supporting rods 5! mounted between the frames 19 and ll. The supporting discs are spaced from one another by spacing collars 52. The outer peripheries of the supporting discs 5% 25 slide in grooves cut in the thumb discs, the notched portion 53 of the thumb disc, in the case of discs 5, 6, l and 8, closing the groove to that normally the circuit is completed from brush‘ 42 to 43. By separating any two contact springs of one wiper, however, the circuit is broken, and - this separating is effected by the insulating se 20 lecting disc'in the following manner. As will be seen from the drawings, the wipers are arranged spirally around the spindle 24 so that only one wiper is in position at a time to engage with a selecting disc. Each wiper is of '25 such a length that it can only. engage with the. tooth of its associated selecting disc and as the wiper shaft and impulse cam are geared together, the length of the tooth positioned to engage with the wiper as shown in Fig. 2 will determine the 30 number of revolutions which the impulsing cam will make whilstthe wiper springs are separated when moving over the tooth and thus the number of impulses transmitted. Care must be taken correctly to shape the tooth and wiper so that 35 the break and make of the circuit is made quickly and decisively, and no undesired impulses are sent. Normally the impulsing contacts 36 are short-circuited through the wiper spindle, that is, the two contacts of 36 are connected to the 40 brushes 42 and 43 respectively so that unless one set of wiper springs is separated no impulses willbe transmitted. This opening of a'pair of . wiper springs by the insulating selecting discs, however, removes the short-circuit and allows 45 the impulses to be sent over, the telephone line. The wipers and selecting discs are so designed that even if consecutive wipers engage the long est teeth of the associated selecting discs, there is an interval between the disengagement of one wiper from its tooth and the engagement of the next wiper with its tooth equal to the minimum interdigital period allowable. If wipers engage shorter teeth of the discs the interdigital periods are prolonged. 55 contacts'in parallel, both of which are con 10 nected in series with the telephone instrument 44,‘ left hand spring of wiper 25 through the wiper contact and right hand vspring of wiper 25, metal 15 to the contacting ring 4i and the brush 43 so 50 calling lever 34 is depressed. The speech circuit is normally connected , From the above description it will be under stood that each wiper engages in turn with its corresponding selecting disc and will open the circuit along the wiper shaft for a time corre sponding to the setting of the selecting discso that the impulses of the number which has been set up are transmitted in correct sequence. For special calls, such as for calling the oper ator by dialling 0, the extra thumb disc I is provided which is a special services disc. When 65 this disc is in position ten impulses are sent be fore any of the other digits set up become oper ative, thus calling the operator irrespective of the setting of the other thumb disc. Normally, of course, this special services thumb disc would 70 be arranged in such a position that it causes no impulses to be transmitted, that is, so that no tooth of the selecting disc I4 is arranged in the path of the wiper 25. However, the extra disc is unnecessary as all calls can be made with the 75 normal number of setting-up devices. 1 3~to 5 show a modi?cation of the ar keep the supporting discs in position. In the case of thumb discs 2, 3 and 4 the supporting 80 discs are kept in position by a separate ring 54 fastened to the thumb disc, the purpose of which will be more fully explained hereinafter. To the opposite edge of the thumb discs are attached ‘the toothed selecting discs iii to 2! 85 which have inwardly directed teeth around their inner peripheries. The selecting discs are made of metal and in the particular example have ten teeth the length of the ?rst of Which corresponds too. time period of one impulse, the second cor responds to a time period of two impulses and so on to the last which corresponds to a time period of ten impulses. A blank space is also provided as was the case with the arrangement disclosed in Figs. 1 and 2. 45 The outer periphery of each of the selecting discs is scalloped to form locating scallops 55. With these scallops a leaf spring 56 cooperates to ensurethat the selecting‘ disc is set accurately in position. a ' The centres of the supporting discs 55) are open 50 and allow a spindle 51 to pass therethrough. This spindle is jo-urnalled in the casing H] and ' wall H and carries seven pairs of spring wipers 58 to 64 which cooperate with the selecting discs 55 It to 2! respectively. One end of the shaft 51 passes through the wall IE and is connected through gearing to a clockwork driving mech anism 65. The clockwork mechanism may be similar to that described in connection with Fig. 60 1, the action of depressing the lever 34 serving to wind the clockwork spring arranged in the drum (55. When the lever 34 reaches its fully depressed position it moves a cam 61 to move a spring pressed pawl t8 out of engagement with a notch in the stopping wheel 69 (see Fig. 5). The motor then rotates and the end of the handle 34 moves to release the cam 6'! so that when the spindle 5'! has made one complete rotation the paWlEB again engages with the notch in the stopping wheel [iii to stop the mechanism. Also geared to the clockwork mechanism is the impulsing cam ‘ii! the teeth of which operate a spring set ii to open and close contacts for the transmission of the impulses. The speed of the mechanism may 4 2,134,626 be controlled by the governor 72. The‘ mecha nism drives the impulsing cam at a speed to produce an impulse for one tenth of a second or otherwise according to the particular system in which the apparatus is to be used and it- is so to the spindle 5'! that su?icient impulses are produced during one revolution of the spindle 5"! to allow for transmitting ten impulses in re spect of each group of impulses and to allow for 10 short time intervals between the transmission of two successive impulse groups. The contacts of each pair of spring wipers 58 to ‘36 are insulated from one another along the spindle 5? in the same manner as the wipers in 15 Fig. 1. Normally the pairs of springs contact together to short circuit the impulsing circuit but are opened when an insulating member carried by each wiper and shown at Ma and Bla in Figure 3 engages with a tooth of the selecting 20 discs 65 to 2! . The arrangement thus works sim ilar to the arrangement described with reference to Figs. 1 and 2. As in the case of Fig. l the thumb discs 2, 3 and Q bear the alphabetical letters and have three 25 letters which give the same number of impulses. In order to attain this end, the notched discs 530. (which also carry the rings on which the alpha betical letters are marked) of thumb discs 2, 3 and 4- are rotatably mounted in another groove cut in the outside of the thumb discs 2, 3 and 4 and are given a limited movement by a projec tion ‘i3 formed in the groove engaging in a slot l4 cut in the notched disc 53a (Fig. 6). This ar rangement corresponds to the pin and slot con— 35 nection shown in Fig. 1 and the slot is of such a length that whichever of the three letters is showing in the viewing window the selecting disc is moved to such a position that the spring 56 can force the locating discs and thus the select— ing disc into the correct position for transmit ting the corresponding number of impulses. The apparatus is driven by a clockwork mech anism 33. On depressing the lever 34 the clock work mechanism operates substantially as de scribed with reference to Fig. 1. The clockwork mechanism causes the spindle 82 to make seven complete rotations before it is stopped again. Also geared to the clockwork mechanism is a commutator 81 and brush 88 which is geared down 7 to 1, with reference to the shaft 82. This commutator has seven contacts each of which is 10 engaged by the brush 88 for one complete revo lution of the shaft 82., The commutator con tacts are connected to seven spring sets 84 so that each of the spring sets is connected in se quence in the line circuit and controls the trans 15 mission of the impulses in accordance with the setting of its associated selecting disc. Also geared to the clockwork mechanism is an impulse generating device (not shown), the im pulses from which are controlled by the opening 20 and closing of the contacts of the spring sets. When the spindle 82 rotates, the thumb discs, the sectors and the locating discs also rotate, the spring contact sets 84 opening and closing on each rotation and controlling in sequence the 25 impulses sent out in accordance with which spring set is connected to the line circuit through the commutator 81 and the setting of its asso~ ciated selecting disc. By making the teeth square out it is possible 30 for the correct number of impulses to be trans mited even if the sector is not absolutely accu rately positioned, and provided that it reaches to or does not project beyond the tooth in ques— tion there will be no fear of incorrect impulses 35 being transmitted. . To effect a call with the apparatus described the. thumb discs are set so that the letters or numbers corresponding to the station to be called appear in the viewing windows. For eX 40 ample if one of the numbers is 8 the thumb disc Figs. 7 and 8 show another embodiment of the is moved around until 8 appears in the viewing invention. In this arrangement the thumb discs 1 window in which position two of the teeth of the 2 to 8 control the operation of sectors 80 over corresponding selecting disc are blocked out and eight impulses are sent when the mechanism is 45 the surfaces of impulse controlling or selecting 45 discs 8| each having ten or more teeth according operated. to the number of impulses to be sent in each With the apparatus described in Figs. 7 and 8 group. These teeth are arranged around ap seven complete turns of the spindle and spring proximately half the periphery of the selecting 50 disc. All the selecting discs are mounted on the spindle 82 which is journalled in the wall I!) and plate H. The sectors are also approximately semicircular in shape and are carried by sleeves 33 surrounding the shaft 82 so that by moving 55 the thumb disc the sectors may be moved to cut out one or more of the teeth. Rigidly con nected to each sector is a locating disc 85 which cooperates with a leaf spring 86 in a manner similar to the spring 23 shown in Fig. 1 to locate 60 the sector in the various positions. Each of the springs 85 is carried from a member rigidly se cured to the shaft 82. Engaging with the periphery of each selecting disc is a set of spring contacts 84 which are vi 66 brated to control the impulsing circuit when moved over the teeth. The spring sets are se to cured to the casing of the mechanism. In order to compensate for the three positions corresponding to the same number of impulses for the alphabetical thumb discs 2, 3 and 4 these thumb discs are themselves rotatably mounted on their associated sleeves 83 and connected to the locating discs 85, which are rigidly connected to the sectors, by means of a pin and slot con 76 nection as explained above. sets are necessary to e?ect a call, and in order to reduce the time, the teeth of consecutive se lecting discs may be arranged on opposite por 50 tions of their peripheries so that the time which would be wasted with the arrangement illus trated in Figs. 7 and 8 in moving the spring sets over the blank portions of the discs until the next set of teeth are engaged is eliminated. In 55 this way the time in making the call is halved and only four complete revolutions of the spindle are necessary. By arranging the teeth to occupy slightly less 60 than a quarter of the periphery of a disc and using the other quarter to enclose the selecting sector, it is possible to make a single disc do the Work of two, thereby requiring only four spring contact sets for sending seven or eight groups of impulses. The selecting sectors can be arranged adjacent the opposite surfaces of the selecting disc. The number of selecting discs and spring sets can be further reduced by arranging all the 70 teeth on the periphery of one disc and providing it with all the selecting sectors in which case only one spring set is necessary and the commu tator may be entirely dispensed with. Such an arrangement is shown in Figs. 9 and 10 in which 75 5 2,134,626 the single impulse selecting disc 90 has its pe riphery divided up into fourteen sections alter nately provided with teeth and plain sections The plain portions are preferably slightly larger than the toothed portions to allow for the interdigital period between the sending of the di?erent groups of impulses. Arranged ' (see Fig. 10). to be moved from a plain portion over its asso ciated adjacent toothed portion are seven select 10 ing sectors 9! to 91 each rotatable about the having to turn ‘it right back again through eight positions. The impulsing apparatus according to the in vention may be mounted in a separate casing or, alternatively, may be mounted in or on a telephone .instrument in a manner similar to that in which the usual dial is a?ixed to the instru ment. Further, it might be associated with a preset impulser; that is an impulser which has several complete numbers or series of groups. set 10 spindle 98 to which the selecting disc is ?xed. up, any one of which may be selected for trans Each of the sectors is mounted on a sleeve the mission. ?rst sleeve 99’ surrounding the shaft 98, the second sleeve lil? surrounding the sleeve 99 and so on. The free ends of the sleeves are provided with thumb discs 2_ to 8 for setting purposes. Stop-s llll may be provided on the selecting disc for preventing the sectors from being moved over toothed portions with which they are not 20 intended to cooperate. . The sectors are located in position by the locating discs I02 which. cooperate with leaf springs I03 as in the arrangementipreviously de scribed. To compensate for the three positions 25 for sending the same impulses on the alphabeti-. cal discs 2, 3 and 4 these are connected to the locating discs through'a pin and slot connection. The spring set H14 is ?xed to the spindle I05 of the clockwork mechanism 65, which is sub 30 stantially the same as that illustrated in Fig. 3 and is arranged to make'one complete rotation when the operating lever 34 is depressed. When the clockwork mechanismis operated the spring set moves around the periphery of the selecting 35 disc and eitherallows the impulses generated by the impulse generator to be transmitted over ‘the exchange line or short-circuits them in ac cordance , withv the setting of the sectors. Further in all the arrangements described ad 40 justing means may be provided for a ?nal ad justment of the relationship between the select ing discs and the wipers. For example, in the arrangement shown in Fig. 1 the wiper spindle may have an adjustment relative to the clock 45 work mechanism or for adjusting the distance between the teeth of the selecting discs and the axis of the wiper spindle. ' It will be understood that with the arrange ment according to the invention no impulses are 50 sent out over the transmission line to which the device‘ is connected, even though the receiver be lifted, until the calling lever is depressed. Thus it is possible to preselect a call even whilst the exchange line be engaged with an existing call. . By providing a normal position in which no impulses are sent it is possible so to adjust the setting-up members that a part code, such as “TOL” or “TRU” may be sent without interfer 60 ence from any‘ other impulse groups. More over, it is possible‘to transmit impulses from. any group for testing or other purposes. Further, by arranging the setting-up devices, such as thevthumb discs, so that they ‘can be 65 completely rotated in either direction from any one setting to any other setting, the advantage is obtained that the re-adjusting of the device from one setting to another setting may be made in the minimum of time. For example, if one of the thumb discs indicates ?gure 9 and the next number to'be called on that disc is 1 it is only necessary to move the disc through three posi tions, that is through 0 and the normal position 75 to readjust the device to indicate 1 instead of I claim: ‘ ‘ . 1. An impulse transmitter for transmitting a plurality of groups of impulses, each group cor 15 responding to a digit of the number to be trans- ' mitted, comprising'a plurality of setting-up de vices, one for each digit of the number to be transmitted, means for visibly indicating the digit set up by each setting-up device, an impulse 20 generating means adapted to operate continu ously each time the mechanism is operated, an impulse controlling device individual to each set ting-up device, and means for adjusting the po sition of each impulse controlling device in ac~ 25 cordance with the setting of its associated set ting-up device, said impulse controlling devices successively cooperating with the impulse gen erating means to permit the transmission of groups of impulses corresponding to the digits 30 set-up on the setting-up devices. 2.'An impulse, transmitter for transmitting a plurality of groups of impulses, each group cor-' responding to a digit of the number to be trans mitted, comprising a plurality of setting-up de 35 vices, one for each digit. of the number to be transmitted, means for visibly indicating the number set up, an impulse generating means . adapted to operate continuously each time the mechanism is operated, a selecting device indi 40 vidual to each setting-up device, means for ad > justing the position of each selecting device in accordance with the setting of its associated set ting-up device, a plurality of impulse controlling members on each selecting device having differ ent dimensions corresponding to the different 45 numerals, a plurality of contact devices one for each selecting device and means for moving said contact devices relatively to the selecting devices so that the same cooperate in turn with one 50 impulse controlling member of each selecting de vice to permit, in association with the impulse generating means, the transmission of each group of impulses and to control the number of impulses transmitted to each group in ac cordance with the time the contact devices con 55 tact with the impulse controlling members‘. 3. An impulse transmitter for transmitting a plurality of groups of impulses, each group corresponding to a digit of the number ,to be 60 transmitted, comprising impulse generating means adapted to operate continuously each time the mechanism is operated, a plurality of select ing discs one for each group of impulses to be transmitted and each comprising a plurality of 65 impulse controlling members of different lengths corresponding to different time periods, a set ting-up device for rotating each selecting disc to bring a particular impulse controlling member into operative position, a plurality of contact de 70 vices one for each selecting disc, each contact device being adapted to cooperate with the im-v pulse controlling member that is in the operative position, and means for moving the contact de vices relatively to the selecting discs to permit 75 6 2,184,626 the transmission of each group of impulses and control the number of impulses transmitted in each group in accordance with the time that said contact devices cooperate with the impulse con trolling members that are in the operative posi tion. 4. An impulse transmitter for transmitting a plurality of groups of impulses one for each digit of the number to be transmitted, comprising im 10 pulse generating means adapted to operate con tinuously each time the mechanism is operated, a plurality of selecting devices one for each group of impulses, ten impulse controlling members car ried by each of said selecting devices, means for adjusting the position of said selecting devices plurality of groups of impulses, each group cor responding to a digit of the number to be trans mitted, comprising a plurality of setting-up de— vices, one for each digit of the number to be transmitted, means for visibly indicating the CI number set up, impulse generating means adapt ed to operate continuously each time the mecha nism is operated, a plurality of selecting devices, one for each group of impulses and each com prising an annular disc and impulse controlling 10 members arranged on the internal periphery of said disc, said impulse controlling members be ing of di?erent lengths and corresponding to dif ferent time periods, a rotatable spindle arranged within said discs, and a plurality of contact mem to move any one of the impulse controlling mem bers into the operative position, a rotatable mem bers, one for each impulse group, carried by said spindle and means for rotating the spindle to ber, a plurality of contact devices carried by said rotatable member, one for each selecting device, and means for rotating said rotatable members with respect to said selecting devices, each con tact device being adapted to cooperate with an impulse controlling member on the correspond cause the contact members to cooperate with one of the impulse controlling members on each disc, and thereby permit a group of impulses to be 20 transmitted during a time period corresponding ing selecting device to permit the transmission of each group of impulses and to control the num ber of impulses transmitted in each group. 5. An impulse transmitter for transmitting a plurality of groups of impulses, each group cor responding to a digit of the number to be trans 30. mitted, comprising a plurality of setting up de vices, one for each digit of the number to be to the impulse controlling member. 7. In an impulse transmitter comprising a plu rality of impulse controlling selecting devices, cor responding setting-up devices and means for in dicating the number set-up; a lost motion ‘con nection between said selecting devices and said corresponding setting~up devices, and locating means associated with each of said selecting de vices for holding it in one position whilst the corresponding setting-up device may be moved transmitted, means for visibly indicating the number set up, impulse generating means adapt to any one of several positions. 8. An impulse transmitter comprising a plu ed to operate continuously each time the mech rality of setting-up devices, means for visibly in 35 anism is operated, a selecting device individual dicating the number ‘set-up, a series of impulse w to each setting-up device, a rotatable spindle, means for rotating said spindle, and a plurality of contact members arranged in spiral staggered relation on said spindle and arranged to cooperate 40 with said selecting devices in turn during a single rotation of said spindle and thereby permit the transmission in sequence of each group of im controlling selecting devices connected with said pulses. 6. An impulse transmitter for transmitting a setting-up devices, and adapted to be brought into predetermined operative positions, said setting up devices each comprising a rotatable member rotatable through a complete circle which can be rotated in either direction from any one set ting to any other setting, EDWARD SHIPTON. OSCAR DOUGLAS KENNEDY.