Патент USA US2404814код для вставки
„my s@ m. L. F.' REINHOLD ETIAL, SELECTOR Filed Jan. 24, r1945 £6.. M Mom@ffWMMÓRA a wwwwwwÍ„CDW.a...um@newHmm@l@œ 0 2 _Sheets-Shee‘t l «MY 3Q, 3946. LF. Rami-:OLD ET AL. ` l @Ai?áßlâ SELECTOR Filed Jan. 24, 1945 2 sheetsfsmt 2 Patented July 30, 1946 2,404,814 UNITED STATES PATENT oFFlcE 2,404,814 SELECTOR Leonhard F. Reinhold, Staten Island, N. Y., and James A. Spencer, Teaneck, N. J., assignors to Radio Corporation of America, a corporation of Delaware Application January 24, 1945, Serial No. 574,288 10 Claims. (Cl. 178-69.6) 1 2 'I‘his invention relates to selectors and more particularly to a device for conditioning appa ratus to be controlled from a remote point. In the printing telegraph art, as Well as in the cept that certain of the parts have been moved art relating to remotely controlled indicators, re corders and switching mechanisms, it is frequent ly required that a station selector be provided for conditioning the receiving apparatus to function into operating positions; Fig. 3 shows a fragmentary view of' the struc ture as in Figs. 1 and 2, where va further step of operation is indicated; ' ` Fig. 4 shows an edgewise view of the mechanism indicated in the other figures, this figure being a cross section on the line 4-4 of Fig, 3; and in response to code signals. This is especially Fig. 5 shows in perspective a portion of the se true where such apparatus is normally to be held 10 lecting cam and associated levers. in a standby condition which would relieve it As a background of art to which this invention from continuous operation until after reception relates reference is made to our co-pending ap of a selecting signal. plication Serial Number 485,186 which was filed Accordingly, it is an object of our invention to April 30, 1943, now U. S. VPatent No. 2,375,828, provide a selector which may be suitable as a sta 15 patented May l5, 1945, covering a Printing tele tion selector in a telegraph system or in any ap graph receiver. In that application we described plication of remote control principles. to an indi a typewheel printer having internally notched cator, a recorder or a switching mechanism. code rings which were arranged and adapted to It is another object of our invention to provide be permutationally set in response to code signals auxiliary equipment to be controlled by a code 20 for the purpose of orienting the printer type selecting receiver so that that receiver, although wheel. The typewheel shaft was caused to ro maintained normally in condition to respond vto tate to a printing position, the character was then code signals, shall require further conditioning printed, and the shaft was then rotated further in order to translate traffic code signals into in to a homing position. telli-gence. 25 We now propose to utilize the principles of code It is a further object of our invention to pro signal selection as set forth in said «co-pending vide a station selector which responds to the cyclic application for the purpose of orienting a shaft I setting of an orientable shaft in different posi as shown in the drawings of the instant applica tions which are permutationally varied for dif tion. We also propose to utilize the srtucture, or ferent stations so that individual stations may be 30 its equivalent, as shown in said co-penlding appli selected from a remote point. cation for cyclically rotating an operating` cam Still another object of our invention is to pro shaft 2, as shown in the drawings of the instant vide a plurality of selectors each associated with application. 'I‘he code responsive mechanism one of a group of receivers in a telegraph system, forms no part of the instant invention and is not, and each selector having means for responding to I therefore, shown or described herein. It is suffi a train of code signals individual to itself. A cient to understand that, in response to code sig feature of our selector meetsI a certain require nals as received at any given station, the shaft ment that any unwanted selectors which may re I may be rotated into a selecting position where spond to a given code combination of a series of it is arrested momentarily, and that, preceding code signals shall be tripped out of action upon and following the cycle of selective orientation of receipt of a subsequent code combination. Thus the shaft I, the shaft 2 is rotated from a position only the one selector which is set to respond to a of rest through one cycle and then stopped. predetermined series of code combinations, step Any desired selecting function may be per by step, will be conditioned for further function formed by the station selector as herein shown ing. The other selectors of the group will auto 45 and described. The ultimate accomplishment of matically drop out. Our invention will now be described in more the selector may, for example, be the starting of a motor, or the tripping of a clutch, or the clos ing of a relay circuit. drawings in which Mounted on the shaft I are two discs 3, 4, each Fig. 1 shows a system of cams and levers for 50 of which is formed with a digital projection, and producing selective responses to code signals and two other discs 5 andi, each of which is formed for producing an ultimate response by way of with a single notch in its periphery. The digit closing a circuit when the selecting function has and notch of two discs 3 and 5 respectively are been completed; ' correspondingly oriented. The same is true with Fig. 2 shows the same structure as in Fig. 1 ex 55 respect to the digit and, notch of the discs 4 and detail, reference being made to the accompanying 2,404,814 3 4 a stationary holding rod and serves to apply pres 6 respectively. At diiîerent receiving stations in a given system the angular displacements of Athe sure between the roller 39 and the cam 1. Cooperating with the cam 2l is a cam follower roller 24 which is mounted on the upper end of a digits with' respect to a reference point on the shaft I are varied so as to enable diiîerent call signals to be responded to by each station. Another cam 1 is mounted on the shaft I and is usedîfor restoring .the selecting§mechanisnrto normal. A pair of step-cut plates 8 and 9 is shown rotatably mounted on a shaft III. The two discs are fastened onto a hub II and arev urged into a push-rod 40. This push-rod is carried in a cylin drical housing member 4I which in turn is sup ;.portedbygthe' front one >of the ¿frame plates 5I. -~A coiled spring 42 acts under compression to urge the cam follower roller 24 against the periphery 10 .of the cam 2|. `.The ratchet plate 8 is formed integrally with a projection 43 which normally rests on a stop pin i'-44.„prior toz-beinglîstepped forward in a clock homing position by means of a spring I2. An operating pawl I3 is associated with-¿the plate 8. A similar operating pawl y'I4-'is-.associated with » wise'direction. l"When, however, the plates 8 and the plate 9. Pawls I3 and ld‘h'avehe‘elpieces I5 15? 9 have‘beeny `moved two steps the projection 43 engages one'of `the contact springs 45 for closing and I6 respectively which are positioned for a circuit. Suclfa. circuit may, for example, in engagement with restoring; elevers. '..Each =,of.¿the clude a magnetic clutch 46, or other device to be pawls I3 and I4 is urged against the stepped face selectively controlled. Power is supplied by. a of its associated plate by means of a"sp"ring` I1. These pawls are also .pivotally mounted at the 20 battery 41. A switch 48 is provided for opening .».the-selecting;circuit. af ter; the; selecting .-'operation slower. ends; Ofmperatingx-flevers <.I8zand I9.l respec tively.` . has been'completed. -_ Of-,course theiresponsive'de vice 46 maybe-of. any;desired'typev and may'op ¿'I'he"l .upperrportionsrofrievers il Banand .I 9-1 are .tionally be constituted: as avbelL. ax’motor.' or.. an ¿somewhat :M5-shaped. `vThatzis toi-say, .they have extensions such as I8a andzflßhîîth'e tfunctions of 25 .indicators-lier example. Furthermore;F when ¿the . ratchet plate 8 is-»movedftoiitsrsecond'stepzitzmay fwhich’fwill fpresentlyf be.;~«.clescribed. .ïAtf .the-i- end ~ be 4caused to` actuate` anyssort offdevicezmech'an :of extension' :I Sli-ás.a:.downwardly1.extending'fmger «icallyfinstead of electrically. I8c which'frides png“ the f-pe'riphery; ofzthe-rcam-'E -ands may f at :times ¿drop ’intoî the‘rnotchi` in; vthis . The- `maerating procedure cam. There issalsoe.aidownwardlyexten‘ding'1in The operation of ourf` selector may`~be illus-` trated vby consideringTñrst 'that'two code signals .fing Eig?ö. ;'It‘.:;rides on ¿thecameGfand-may:drop >frinto @aranotchî therein. ‘î The ilevers'îlßpand I9` are are successively received, one“ òf vwhich causes the ,.=pivote‘d1.:onz;a ñXedfshaftlZll-fwhich Vis secured to uthe'iframe plates 5I. “'¿Thezshaftf 2: fhasfimounted thereon three' cams `shaft I .to beV rotated >into position where thedigit "on cam'3 -comes'directly under' the'fingerï 26h andthe-notch in the disc 5 comes’directly'f'be oraise‘d :..portion fforfîr controlling .I a. cam: follower. "neath'ïthe‘ toe> piece "|8c. ‘The operation presently to be A'desciï‘ibedfwill be'ïfollowed -by‘ the setting :These :cam followers: are fof” vrollerîformation». and -ofrthe shaft’ I` so- that' the ydigit on- the disc'L 4 is “alignedzwith 'thef`ñnger '21h at theend of llever ~«are.;shown’frespectiv'ely: at7 positions.v 24 and’.y 25. à "The .tworr'ollersi 25 `on ¿the `upper iside of 'the ‘shaft are“=moun-ted« respectively at 'fthe' »left ends f( as 1 arm v21;v and -the> notch inthe' ldisc 6 comes direct 4‘ly/beneath »the'toe piece 19o. *Following Veach .setting of `»the shaft I» »into a selecting position it »viewed in"‘the"ïñgures) - of loperating leversV 2lil and 21. These lever.; are pivotallyim’ounted'respec- i '-is» arrested’ for afsuflicient time soV that 'the se rtivelyforr-'theL arms-ï-Ißaiandf 19a. f’lievers 26’ and I" 21 fea'chbhave r-fdownwar‘dlyf-«extending- arms 26a lecting operation may be completed bythe rota tion of fthey camïshaft- 2. -After' the performance » andf~f21a,»~ and‘fthey' 'have 'horizontally extending ~ `‘of-each-«selecting operation -the -shaft I -is- caused arms "ending-in" fingersl26b vandì 21h. ì‘The fingers 2617- and“ '2 1b“ are” normally >h'e'ldA `sliiliciently clear `to/be-rotated toa‘horning position. VVThe shaft I, therefore;=m'akes `one complete but interrupted of"- discs* 3' and' 4‘- so`- that. theüligits` on these 'discs ‘may‘freely’ rotate. beneath'. them. " 'The clearance `vi_s,; however, “closely adjusted“ by ‘means ofY a.. 'stop member'28 which ¿spansthe .space between 'the zframejplates‘SI `and i'sheldby'th'ese platesin any 55 desired, position ._ _of ...adjustment _about its Vexcen ...tric bearings 2.9. @The rollersl 25...are- urged. downwardly.: against „the perípheries of, the> cams.22 and 23 by virtue .of _lthesspringctension ein. lsprings 3D „which f.. are .ñxedlymounted at,.the lower. end Varid arehooked into=the,levers"26.and"21 respectively. ...A' holding, pawl.3I.Tis...pivota_lly .mounted on a shaft.' 32..,and ,is urged„againstY the. periphery, of `.th'e_„.plate-.8.,]oy..meanssoff,aspring 33. »On»,.th’e .65 .hub . which .. carries, the pawl., 3 I , is .a , cylindrical member 34 which is ».drüled` to. receive .a-push rod 35. At the right hand endof. .the push-.rod ¿35..is a crossepim36-which'is„.engaged..in they slot :of î:ai.-bel1....c1:ankf.31. . Bell fcrank~31 _is -pivotally .fmounted oniazstaff 38.1, and zits' rightV hand' exten sion carriesacam- follower- roller-'39 which is po .sitioned in-¿the sameA plane with,y andrides on, .ther periphery-.of ¿cam 1. ¿1A-¿spring 50. is., con nected.- between'onem'm otthezbelb crank'v 371 and revolution-A in responseto ‘the reception »of each code signal. ' “The codesignals are received on- a code trans lating ' device -:suchä as '-"shown lin . our- aforemen tioned =co-p_ending :patent application, ’Serial ’Number 485,186», operating as a start-stop' device. .Ther two shafts I' and'.A 2.are-` stationary untill the lselecting A.magnets ‘> of ' the` code r translator have been> actuated. 'These shaft " I'i-and" 2 are- then .simultaneously i rotated; shaft I ‘beingf given. a greater. velocity thanïthatv of shaft 2 so that any selectedv position .around theA circumference of the circle - may -be-.reached ‘while "shaft >`2 4rotates >through:'substantially 180° more or less. Shaftv 2 thena‘b'rings its1cams22fand 23A up tothe posi tions .shoWnïin "Fig,u l, immediately -' subsequent to which the cam followers Am0un-ted»"onf'the .leversN 21:' and 1' 26 are>` successively. lifted. f Cam 123: has-1a hump which actuates lever 21 prior" to the actuation of lever 26 by a: similar Ahump on :cam :22. If'the ñrstxcode .signal` to'be received ¿is-'Suchasto-position the digitÍ on disc 3L under ,theçñnger 26h, then .lever 26 willv beY fulcrumed =,atithe tip 'ofv linger-2Gb and. will cause’ lever I8 to be rotated on its pivot bearinguîß. îThis rota tion of `lever;.l8 is .at .thistime-apermittedî by the 2,404,814 5 position-ing of the notch in cam 5 so that it may be entered by the toel piece I8c. The result is to move the pawl I3 to the left and to rotate the ratchet disc 8 through an arc represented by one step, or the distance between the two steps of discs 8 and 9. ‘ After the discs 8 and 9 have been moved one step, as above described, the shafts I and 2 are second step of the selecting cycle will then be completed after restoring the shaft I to its hom ing position. Then the digit on cam 4 is for a. second time brought around and stopped under neath the linger 2lb. At this time the pawl I4 will operate to advance the ratchet disc 9 to the end of its course where the projection 43 is brought into engagement with the under-contact returned to their homing positions where they 45 for closing the circuit to the device 46. are_de-clutched from their driving motor (not 10 Restoration of the discs 8 and 9 to normal is shown) until after reception of `a second code accomplished at different times under varying selecting signal. Such a signal may, for exam ple, result in the positioning of shaft I so that the digit on disc 4 comes directly beneath the conditions as will now be explained.V ( 1) The ñrst condition to be considered is _ where the selector has operated at unwanted This selective setting operation is 15 stations to advance the ratchet discs 8 and 9 finger 2lb. then followed by the rotation of the cam shaft 2 through positions which will cause the actua tion of levers 26 and 21 for a second time. Since lever 21 operates prior to lever 26 and since it is now caused to be fulcrumed at the tip of finger 2lb, the pawl I4 will be moved to the left while engaged with the stop on disc 9, thus moving the discs 8 and 9 to their most advanced posi tion where the extension 43 engages with the lower one of the contacts 45 and closes the cir sponse to the completed selecting operation. cuit of device 46 for providing the desired re sponse to the completed selecting operation. The 4advancing movement of pawl I4 is immedi ately followed by an ineiïectual release action through the rotation of lever 26 on its pivot bear ing`49. This release action is ineffective because the pawl I4 has already been engaged against the step of disc 9 and has driven the two discs 8 and 9 forward so as to be held by the pawl 3|. It should be constantly born in mind that our selector is arranged to set up conditions in any one of a plurality of receiving stations so that the subsequent transmission of intelligence sig through one step. At these unwanted stations the discs 8 and 9 must be returned to normal at the time of a reception of the second selecting code signal. At these unwanted stations, there 20 fore, if they have been partially selected, the rotation of lever 21 on its pivot center 49 will kick out the pawl I"4 because there is no position ing of the digit on cam 4 under the finger 2lb. The selectors at the unwanted stations having 25 been dropped out by this operation will then be in readiness for response to a full complement of selecting code signals if any one of these sta tions‘is subsequently required to be selected. ` ` (2) After the ratchet discs 8 and 9 have been 30 fully advanced by reception of two code signals ’ which are capable of accomplishing this fullad vancement, the code discs 8 and 9 can only be restored to normal inresponse to a special code _ signal designated for this purpose. Such a signal 35 is arranged to orient the shaft I so that atits point of arrest the bell crank 31 will be moved into its actuated position for driving the push rod 35 into the path of the push rod 40. The push rod 35 now stands in this position while nals shall be responded to at only one station. 40 the cam shaft 2 rotates to the point of position Accordingly, the selecting code signals which are ing the opposing humps on cams 2I and 23 in a to be used for making a station selection will vertical axis. The push ro`d 49 is, therefore, de be varied permutationally. That is to say, the pressed atthe same instant that lever 2l is caused digits on cams 3 and 4 will be differently disposed to rotate on the pivot center 49 `and to kick out in angular relation to a common reference point the pawl I4. Pawl 3| will be simultaneously on all of the shafts I at diiferent stations to be kicked out so that the ratchet disc 8 will return individually served byvtheir selectors. It is, how half way to` the point where it will be held by ever, within the scope of the invention to provide pawl I3. A further rotation of the Cain shaft -2 cams 3 and 4 and associated cams 5 and 6 so now causes lever 26 to be actuated for kicking arranged that in addition to being able to re 50 out pawl I3. The complete restoration of the spond individually at different stations to ap cams 8 and 9 is, therefore, accomplished and all propriate selecting signals, all stations may be elements of the selector are returned to their simultaneously called in response to a special homing positions. code signal. For enabling all stations to respond It is contemplated that in certain instances simultaneously, therefore, it is only necessary to 55 selection of a station may require the transmis provide two digits on each of the cams 3 and 4. The reference points of the digits which are used for individual station calling will then be as sion of three or more selecting code signals rather than only two as herein shown and described. In such case the lever mechanism including the shown and described, while the reference point combination of levers 26 and I8 and their asso of the cam digits for the universal calling signal 60 ciated pawls and cams will of necessity be in will be uniform at all stations. If desired, the two digits on cams 3 and 4 for universal calling may be given the same angular disposition with creased in number. By arresting the shaft I in successively different positions corresponding to sequential action of the two levers 26 and 2'I it mentof such ratchet plates until the extreme position of advancement is reached. This modifi the digital arrangement on the cams 3, 4 and respect to the common reference point on shaft the like, the ratchet plates 8, 9 and the like may I. Due to the fact that the humps on cams 22 65 be engaged by different operating pawls,V each and 23 are disposed at an angle to each other for taking its turn in producing stepwise advance will be seen that when the digits on cams 3 and 4 are simultaneously situated under the fingers cation of our invention will be readily under- ' 26h and 2lb that, although pawls I3 and I4 are 70 stood by those skilled in the art without further both moved to the left, pawl I3 only will be illustration or description. effective in advancing the ratchet disc 8 in re We claim: _ sponse to the first code signal setting of the cam 1. A selector of the type which is controlled. by 3. Pawl I4 returns in time to act as a holding a telegraph receiver `responsive to oodle Signals, pawl against the step in ratchet disc 9. The 75 said selector comprising a plurality of selecting 2,404,814 8 , of „selecting signa1s,„a-.settable rotor. and a; »plu rality> of coaxially mounted cams, the -rotor and cams being vmounted on two different shafts l>for actuating each selector unit, and being subject discs-.eachycarrying a projecting digitand each firmly; mounted-on a- shaft the orientation» `of which is selectively obtained by said telegraph receiver,v anv operatingcam shaft having a piu to control by said telegraph instrument, a device ralítyof cams thereon, each cyclic revolution to be actuated by Yadvancement of the ratchet of which-is effected subsequent tothe reception discs to a predetermined step, a pawl4 retracting of each selecting code signal, said orientable shaft system operableto disengage andrelease the par beingarrested in a signal-controlled position dur tially advanced ratchet discs at all but a-selected ' ing a partV of said cyclic revolution, a ratchet and pawl combination corresponding to each of said 10 one of said stations, a holding pawl> operable to retain the ratchet discs of the unit at the‘ïse selecting discs, the several ratchets being rotat lected station in its advanced position, and code signal responsive means for unlatchi'ng said hold ing pawl and for restoring the entire selecting able as a unit, an operating lever for individually supporting each pawl, the several levers having a common pivot, a cam follower lever linked to each Vsaid pawl operating lever, means operable 15 unit to normal at the selected station. 6. A selector comprising a settablerotor having two digit-carrying discs and two notched discs, cam‘follovver lever when the associated selecting by an appropriate one of said cams through its the orientation of a digit and a notch being `the same in one cooperating set of discs and the same disc is oriented into a selecting position for caus ing that cam follower lever to be pivoted `at the apex of the digit on that disc, whereby the asso 20 in the other cooperating set, the orientationl of the two digits being predetermined with respect ciated pawl is actuated for stepwise advancement of its ratchet, and meansV responsive to a condi to a reference `meridian so as to render this se lector alone among a group of selectors respon sive to a giventrain of codesignals, a cyclically selecting `position for causing the associated 25 operable cam shaft, cams on said shaft, two cam tion of orienting ‘a selecting disc into a non ratchet to be released by its pawl. follower levers arranged to ride the peripheries of said cams, each lever> having a linger for feel 2. A selector ofthe type which responds cycli cally to the orientation of a variously settable shaft and to the driving force of a start-stop cam shaft, said selector comprising at least two 30 ratchet discs rotatable as a unit about a ñxed axis and having a staggered relation between a ratchet step of one disc and that of the other, a plurality of levers each carrying a pawl for engagement with a respective one of said ratchet 35 u discs and swung on a common axis, cams mounted on said cam shaft, a cam follower lever opera ing the presence or absence ofa rotor disc digit in a selected position, two ñxedly pivoted paw-l-r carrying levers each linked to a respective -one Vof said cam follower levers and having> a> >pawl pivotally mounted on one extension thereof lwhile a toe piece terminating another extension there of is arranged to ride the periphery of a respective one of said notched vdiscs and at times. to seat it-> self in the notch, a ratchet disc assembly subject to stepwise advancement by saidpawls when a toe tively associated with each said cam and with piece enters a disc notch, and means for unlatchfa corresponding digit-supporting disc which is ing a pawl during a cycle of the cam shaft when mounted on said settable shaft, each said vcam 40 the rotor is set to a non-selecting position.. f ' follower lever being linked to an extension arm 7. In a cam-driven ratchet-and-pawl actuator on a respective one of said pawl carrying levers for a selector, a rotor having a .homing .position and being movable by a peripheral hump on an and means for variably orienting the same in dif appropriate one Vof said cams in either of two ferent selected positions, a plurality jof disc> sets modes depending upon the orientation of said on said rotor, ,each set comprising a Vdisc having a settable shaft to arselecting or a non-selecting radially. extending digit and a discV havingV a position, one of said modes being effective to ad notch the meridian of which is the same as thatY vance a pawl _so as to step forward its ratchet of said digit, the angle between two digits being disc, and the other of said modes being effective predetermined in accordance with successive po-. to release a' pawl from its ratchet disc, and means 50. sitions of orientation which are chosen for con- Y operable by said ratchet disc unit after advance trol of the selector, a pivoted ratchet disc assem ment thereof through a predetermined’number of steps for giving effect to the completion of the operational steps of the selector. bly `comprising a plurality of discs with stepped peripheries, and a lever system for advancing said assembly step-by-step through apredeterminedY _ 3. A selector according to claim 2 and including 55 arc, said lever system including pawl-carrying means operable by a third cam on said cam shaft, ' levers and pawl-Vunlatching levers', each pawl butisubject to selective control by setting the carrying lever being ñxedly pivoted and integrally orientableA shaft into a position which is reserved for a restoring operation, whereby the ratchet disc unit is unlatched and allowed to be retracted formed with a toe-piece extension for entering the> notch of one of said rotor discs respectively, each` paWl-unlatching lever having a ñnger for oppos ing the digit on one of the digit carryingl discs respectively, and also having a cam follower eX tension and a pivotal linkage with a compan to a homing position, . 4. A selector according to claim 2 and includ ing means for unlatching the ratchet disc at the ionate one of the pawl carrying levers. _ ` position of an intermediate step of advancement upon rotation of the cam shaft after setting the 65; 8. In a selector, the combination according to orientable shaft to a non-selecting position. claim '7 and including re-set devices of two types for restoring said ratchet disc assembly >to a nor-` 5. A system of selector units‘located at dif mal position, Vone typ-e being effective through one of said unlatching levers to release the ratchet disc assembly from an intermediate step of ad vancement, and the other type including a hold ing pawl which engages the ratchet disc assemblyk only at the last step of advancement and is/jun latched therefrom in response to the setting of ferent stations, each unit being mechanically coupled to a receiving telegraph instrument, each selector'unit comprising ratchet discs to be ro tatably advanced step-by-step-in response to the reception of selecting code signals, a lever sys tem including a plurality of pawls arranged and adapted to effect said step-by-step advancement of .theratchet discs in response to the reception ze said> rotor ,to acontrolling position for this func-f 2,404,814 tion, and cam driven means for producing the un l0 latching movement of said holding pawl. sponses of said selector, a holding pawl effective to retain the ratchet member at the extremity of 9. In a call selector, the combination of tele graph receiving means for setting a rotor to dif its advancement, and means responsive to the re ception of a code signal of “sign-01T” signiñcance, ferent selected stops, at least two successive set tings being required to complete a selecting op eration, a cyclically operable cam shaft and lever which signal is manifested by the setting of said rotor to a special stop, whereby said holding pawl mechanism driven by cams on said shaft under control of indexing devices on said rotor for pro ducing either a selecting response or a non-se lecting response to the reception of a code signal, a ratchet member subject to stepwise advance ment by pawls which are propelled by said lever mechanism, and subject to tensional retraction upon unlatching said pawls, feeler extensions on elements of said lever mechanism for engagement with said indexing devices, thereby to differen tiate between selecting and non-selecting re is subject to an unlatching movement which is cam-propelled upon revolution of said cam shaft. 10. The combination according to claim 9 and l() including means under control of said rotor when set to a non-selecting stop for causing a pawl to be disengaged from a step in said ratchet 'mem ber and for preventing the stepwise propulsion of that same pawl, whereby the ratchet member is released from an intermediate step of advance ment and permitted to be retracted. LEONHARD F. REINHOLD. JAMES «A. SPENCER.