US1576167A - Storing transmitter - Google Patents

Description

March 9 1925- E. R..WHEE| ER ET A.

STORING TRA'NsMT TER Filed May 9, 1G25 7 Sheets-Sh'effl l JHM *wl i @um 1,576,167 f E. R. WHEELER ET AL STORING TRANSMITTER March 9 ,Y 1926.

Filed May 9, 1925 '7 Sheets-Sh'e'et'? qu" G o O I o o l I /l v I O O 17 o o f S X15 1 o l E\ :7 5 J6 S i j@ S 9 zo( 2l o 11 1o 9 O O j; f 'Z6 March 9 1926.

E. R. WHEELER ET Al.

STORING TRANSMITTER Filed May 9. 1925 7 Sheets-Shen??I 5 vak? 7 March`9,1926. 1,576,167

E. .R. WHEELER ET AL STORING TRANSMITTER Filed May 9, 1925 7 Sheets-Sheet 4 S11/wanton,

51H01 n e 11 Manchy 9 1926.

. 1,576,167 E. R. WHEELER ET AL STORING TRANSMITTER Filed May 9.. 1925 7 Sl'leets-Sh'et 5 March 9 1926.

' l,576,167 E. R. WHEELER ET A L Y i sToRING TRANSMITTER Filed May 9, 1925 7 sheets-sheet e E w lfm elfl'ozum Marh 9 1926. 1 1,576,167

I EL R. WHEELER ET AL sToRING TRANSMITTER Filed May 9. 1925 7 sheetshf v Il! I 56. 'M n@ v J r! y wvelntou,

atto-1 ne Pafiaed Mar.' 9, 1926.

UNITED STATES PATENT OFFICE.

EVAN R. WHEELER,v OF NORTH PLAINFIELD, NEW JERSEY, AND ROBERT F. DIRKES,

OF JAMAICA, NEW YORK, ASSIGN ORS TO THE WESTERN UNION TELEGRAPKH COM- lPAN'YfOF NEW YORK, N. Y., A CORPORATION OF NEW YORK. i

l. set County, State of New Jersey` and Jainaica, in the county of Queens and State of New Yo1k,respect1vely, have invented certain new and useful lmprovement'sin Storing Transmitters, ofwhich the following is aspecification. I This invention relates toI transmitting apparatus for use in automatic telegraph signaling and is adapted for transmitting sim plex, multiplex, Morse or automatic ticker signals.

T he storing of the signals between the setting up by the typist on the keyboard and the automatic sending-on or transmission side of the pin-drum and acts to push the into the line or cable has heretofore been accomplished. by a vtape which was first punched by the keyboard mechanism land then passedy through the tape-controlled transmitter. A'Ihe useof a tape, however, introduced certain defects which are overherein,. s uch as tape sticking, and dust from the tape. l\.[oreover, the loss of time between thesetting up of the'characters andthe printing ofthe same, due to tape lag, is

tpractically eliminated.

is also greatly reduced since the perforated tape became a waste product as'soon as it was used. f

The storing transmitter allows the same flexibility of operation ,astape transmission. The setting up and transmitting portions of the mechanism are independent both electrically and mechanically eXc'eptas limited by the number of characters which can be stored u inthe drum of the transmitter. Thekey oardused for Vsetting up the characters is what istermed as a free keyboard. lthat is, theoperatoris not required to keep lplished from-the keyboard through the cncome by the storing transmitter disclosed The operating cost outward from inl synchronismwith anyy mechanism orde- Appiication inea-May 9, 1925. serial No. 29,158.

up or preparing a character selection, and the other carrying a mechanism for converting into electrical selections the mechanical selections which have been previously pre` pared and stored. The' elements 11e-:ed for' mechanically storing the selections are small metal pins set into holes in the hollow cylin- 'der or drum. The number and arrangement of holes and pins may be as required for the Imrticular telegraph code and transmission system used. In the transmitter illustrated, a code of six impulses per character is chosen and there arc accordingly six pins in eac-b: vertical row in the drum. The number of rc1-tical rows of pins fix the number of characters which may be stored 11p at any one time.

The setting up mechanism is larranged in'- pins outward so that .they exten-d from the v outer surface of the drum. This is accomergizing of certain magnets of hich there are twelve placed in pairs diametrically opposite each other. The operation of these magnets is transmitted mechanically through elevating rods and universal Arings toA levers on the setting up arm which in turn push out such pins as are required for each character selection. The operation of the keyboard also causes the setting up arm to advance to the next vertical row of pins following theA preparation of any selection.

After the setting-'up of a character, the transmitting arm, which .extends down over the outer surface of the pin-drum, causes collector shoes to ride up over the top of the pins which' have been` selected or pushedthe i drum. The collector slices in turn close| contacts whichr are also carried on'thegtransmitting arm. For completing the circuits from the contacts on the transmitting arm to outside apparatus, -a commutator-havi-ng a numberof rings insulated' from each other is mounted solidly .on the transmitting arm. Stationary brushes with wires leading to outside circuits-rub on the commutator rings as thearm revolves. i A

'mounted on the transmitting arm acting p through linksand a pawl on a ratchet and v pinion. The stepping magnet is energized -l arms.

' application vof the storing transmitter to plex printer operation.`

from certain of the transmission control circuits. v 4

Means is provi-ded on the setting up arm for restoring the selected pins `to their normal unoperated position consisting of a slpping'plate which pushes the pins back to the surface of the drum just as the setting up arm passes over them. The pins are rcstored just prior to the setting up of a new selection.' j

To prevent the transmitting arm from working too closely to thesetting up arm,

and colliding with it, a contact is attached to the transmitting arm which is opened by a projection on the setting-up arm when the transmitting arm comes suiciently close, the opening of the contact preventing further advancement of the transmitting arm.A

A warning light orbell is provided which operates when the 'drum has been filled to its full storage capacity and the setting up arm lhas approached suiliciently close to the transmitting" arm. 0

In the following det-ailed description wev shall refer -to the accompanyingdrawings, in whichi- Figure 1 is a perspective view of an -a paratus embodying our invention, a porti nbeing broken away to showthel details of-the setting-up magnets and lthe' associated parts for selecting the pins -in the drum;`

Figure 2 is a central 'vertical sectional View of the same;

I Figure 3 is a top plan view of the mechanism for rotating the setting-up arm and the transmitting arm step by, step around the pin drum;

-Figure 4 is a schematic view show-ing one unit of the setting-up mechanism of the stor-l ing transmitter and our arrangement of ap- "paratus for actuating the same;

Figure 5 is an enlarged fragmentary detail perspective view showing the transmitting shoes and contacts for transforming the character selections-mechanically stored in the\pin drum into electrical selections.

Figure is a fragmentary horizontal sec-l tional view through a portion of the drum showing the method of resetting the pins;

Figure 7 is an enlarged longitudinal sectional view of one of the pins;

' Figure 8 is a fragmentary vertical sectional view showingfa preferred method of mounting the setting-up and transmitting Figure is a detail showing the autos matic stop contacts; and Y .Figurev illustrates diagrammatically the Slmf pin-drum consistso'f a metalltilbe' 1v waaier` which is usually about three inches long, six inches in diameter and three-eightlis of an inch thick. The drumrisdrilled with vertical rows of six radially-"extending holes in which ai'e inserted \pins 5. Each pin is about one-quarter of aninch longer than the thickness of the drum and is slotted and perforated as shown in Figure 7 toreceive a small sprin 6 made I of. fine piano wire. lrVhen 'the pin is inserted in a hole in the drum, the spring' exerts a pressureagainst the side of the hole which creates sulicient friction to maintain the pinin any set position unaffected by mechanical jars and vibrations'.

being used for the si'xiirnpul'ses of each c aracter selection. rows or sets of holes may be Varied accord ing to the type4 of service for which the transmitterl is intended, and the storage ca- Each vertical row or set of pins represents one telegraph character, six ins' The number of ,vertical pacity desired. The apparatus has hereto- 4 fore been constructed with 96 vertical rows.

y Preparing selections in the pins.`

Figure 4 shows one of the pins and its associated selecting mechanism. This mechanism is duplicated for each of the other Thepin 5f is shown in: its non-selected position ve selection impulses 'of a character.

with its outerend nearly flush with the outer surface of thedrum. When a pin is` selected it is pushed outward so that it protrudes on the outside of the drum and is nearly flush' with the inner surface. I

vA pair of setting-up magnets 8 are providedA for each impulse selection, arranged diametrically opposite each other just outside a-nd below the pin drum;y The armatures 9 are pivoted at 10 and carry arms 11 which-'are forked at their `outer ends 12 to fit over *shoulder pins 14 on the elevating rods 15, the latter sliding in lower bearing plate 1G. The arms may be connected to the rods 15 vby a ball and socket joint as shown in Figure 2.4 Rigidly mounted on each pair of elevating rods is a universal ring 18 which must be parallel with the pins.

W'hen .the magnets are energized, the arms 11, carriedvby the armatures 9 raise the elevating rods 15 and 4universal rings 18.

.By using two magnets to lift each ring from opposite sides, the moving parts move freely with'out any tendency to bind and the rings are maintained -in true horizontal position. Placed between the universal rings and the inside of lthe drum is a supporting column 20, depending from the setting-up army 27, on which-'are mounted six selecting hammers 21, pivoted at 23 so that they may be rocked'upwar'dly or downwardly. The in aol iio

ner ends of the selecting hammers are' forked i I and lit closely over the outer edge ofthe cor-. res onding universal rings 18.

en a universal ring is rased, the vcorg` isoA inner end of the corresponding pin 5, forc-v v ingfit through the drum into selected yposition. .To prevent overthrow of the pins fwhen selected and, to cause them to protrude a uniform distance from the surface of the drum, a limit plate 26 is positioned opposite the row of pins being selected and at a sufficient distance from the drum to allow al slight ymovementof the pins between the limit plate and the end of the selecting hammer. Following each character selection, the arm 27 `with its attached mechanism is advanced one step in a manner to be described, so that the ends of the selecting hammers 21 come opposite thev next following row of pins.

Restoring pins to inoperative position.

Just forward of the selecting hammers 21 and also hung from the setting-up arm 27 is a sloping steel xplate, 28 of suiicient height to extend overthe rows \of six pins.

As will he seen from Figure 6, -when the.

.the pins from noving lnwardly too far.

The position of the pins on resetting is thus determined. by the resetplate 28 and the inside -limitplate 29 and onsetting-up by the selectmg'hammers 21 and the outer limit; plate 26. 1

Mechanism for-collecting ami electrically transmitting the stored-up charaezein impulses.

After the preparation of the character selections in the manner above described, the pins 5, which have been selected and protrude from the outer surface of the drum are caused to actuate circuit closers or transmitting contacts for the purpose of sending electrical impulses to the line or of controlling other auxiliary sending apparatus by mechanism illustrated in Figure 5.

In this figure a row or set ofJ pins 5 is shown 'in selected position. A transmittin arm 30 rotatable about the same centra shaft as is the setting-up arm 27, extends down over the outer surface of the drum and carries six collector shoes 31 and six transmitting contacts 32. Each collector shoe is separately pivoted on' a shoulder screw 33 which carries a coiled spring 34 acting to depress the end of the shoe nearest the, pin drum and vto correspondingly raise the outer end which is nearest the transmitting contact 32.v Pins 35 stop or limit the upward motion of the shoes and determine their normaliinopera'ted position. l'lhe ,upper collector shoe 31inf1 `igure5 is shown one row of, pins to the y'right ofthe five lower collector shoes and vrests ion" a'pin-pf the jnext following character.- This is for the purpose of transmitting this. impulse in advance of the others when thev storing transmitter is used for automaticticker transmission. 'It used for simplex printer operation or on other systems than tickers, the

upper transmitting contact and shoe would not be advanced with respect to the others.4

' It is evidentthat the transmitting shoes and contacts may be arranged in any desired relation to each other, as determined by the transmission requirement or theconstructional requirements of the storing transmitter itself.y Likewise the selecting hammers 21 previously described, may be arranged in staggered relation instead of the same vertical line, if desired.

The inner ends of the collector shoes 31 are beveled as shown, and as the transmitting arm 30 is stepped forward from left to right, these beveled surfaces strike the protruding pins 5 which have been selected and slide up thereon, thus causing a rocking of the collector shoes about the pivot screws. The outer ends o-f the collector shoes 31 carry contactsprings 36 which are in a position to make contact with-transmitting contacts 32 when the contact shoes are actuated by sliding up on a selected pin. Thus each pin 5 which is selected causes its corresponding shoe to rock and close its contact 36 against a transmitting contact 32. The impulse which was mechanically selected and stored by the pin in the drum is thus trans-` formed into an electrical impulse. i

When a pin is ynot selected and hence does noty protrude from the outer surface of the drum, the beveled end of the corresponding collector shoe 31 does not strike when passingthe pin and consequently remains in inoperated position. When the transmitting arm 30 comes to rest after each advancement, the collector shoes. 31 -rest on top of the selected pins in thatprow and the contacts 36 and 32 are held closed until the arm 30 is again advanced. The length of the beveled end of collector shoes 31 is such rthat the contacts 26 do not break from contacts 32 when the' shoes are advanced from one` row of selected pins tocorresponding Each contact 32 Mechanism for advancing setting-up and transmitting arms.

1i The setting-up arm 27 and the transmitting arm are separately rotatable about a central vertical shaft 41. Our preferred 'form of bearings is shown in Figure 8. 'Setting-up arm 27 has a thrust ball bear- 42 which rests upon a shoulderf43 on the shaft 41. This bearing supports the weight of the setting-'up arm and its associated mechanism. Radiial bearing 44 is placed in .the upper part of the bearing 0 housing of arm 27 and rests on shoulder 45 of shaft 41.

Similarly transmitting arm 40 has a thrust A bearing 46 resting onshoulder 47 of shaft v 41. `.Trans1nitting arm 30 carries the com- 25 mutator 39 through which the electrical connections 4are made from the -various contacts and magnets on the rotating arms to the outside associated apparatus.

As shown inFivure 1, setting-up arm -27 im has secured to it 1the supporting column 20 which carries the selecting hammers 21 for setting the pins inthe desired selections. 'Ihis arm also carries the outer Aand inner limit plates 26and 29 respectively and the reset plate 28. Figure 3 shows in top plan view the driving mechanism for actuating both arms. The setting-up varm 27 Icarries a bell-crank 50 which is pivoted at 59 and carries a pawl 51. Action of the armature 56 advances the pawl51 one tooth'on the ratchet wheel 52 and the armature 56, upon being restored under the influence of the.

' spring 69, advances the ratchet wheel 52. Mounted on the shaft of ratchet wheel A15 52 is a pinion 6 3 which meshes with gear 2 and steps the setting-up arm 27 -one space. To^prevent pawl 51 from throwing out on the return stroke and also to check the effect of the inertia of the arm tending to \step two spaces instead of one, we have' de- 'vised a novel `locking device comprising a crank arm 57, pivoted at-54", and which is Y so ,shaped and located with respect tothe arm 50 and'pawl 51 as to prevent the lat- 55 ter from turning on its bearing 501 and disengaging when the lever arm 50 is in the `position shown." This locks the pawl 51between the crank arm 57 'and at 00th of the Iratchet 52-and thereby prevents any `:tur-

60 her movement of the setting-up arm. Up-

' pn the operation of the magnet 74, the crank 57 releases, dueto its shape andy arrangement and offers no resistanceto the advancement of the pawl 51by turning on its pivot 54a.

Thus a' positive step and lock is obtained 65A 'with a ratchet combination. Backward movement of the ratchet 52 is prevented by T e' transmitting arm 30 is driven in a similar manner. Lever 60, pivoted at 67 is 'I0A actuated by armature pivoted at 66, through link 68. The lever carries pawl 61 which engages ratchet 62 and through ,the pinion and-circular rack 2 advances the A arm 30 on the return 4stroke of the arma- 75 -ture 65 under the tension of spring 71, Crank 64 pivoted at 72 prevents the overthrow of pawl 61 at the end of the return stroke in the same manner as previously explained with crank 57 acting to prevent 80,

overthrow of the setting-up arm 27.

Automatic stop for the trammtz'ng arm.

The storing transmitter disclosed herein is capable of sending .the character immediately following the one set-up, but for better mechanical working margin, it is usually better to transmit the secondi character following the one set-up. Thus the lag between the preparation of a character and the transy mission of the same character is greatly reduced when compared with tape transmission. If the operator should stop sending or for some reason send slower than the speed ,of transmission, a device is provided for stopping the operation of the transmitter stepping magnet. A contact 76 in series with magnet 70 carried by the transmitting arm 30 is adapted to be engaged by a rod 77 carried by the setting-up arm 27 lwhen the relative position of the arms is such that the transmitting arm is within two characters of the setting-up arm thereby opening the oircuit of the transmitter actuating'magn. nGt 0. y

Wamfng light for setting-up arm.

As the 'speed of the transmitting arm, due

t0 its regulation from associated outside apparatus may be appreciably slower than the speed of character preparation', all of the sets of selecting pins -in the drum can be filled andthe setting-up arm 27 will then be liable t6 interfere with the transmitting arm 30. vWe therefore, provide a signal to warn the operator of the impending interference so that he can stop until the. transmitting. arm has regained its lead. lVe therefore, /attach a, leaf spring 80 to the setting-up arm 27 and a contact stud 81 to the y,transmitting arm 30 so that when the setting-up `arm is within ten characters of the transmitting arm, the stud 81 engagesV f the spring 80 and 'thereby completes a circuit through a red lamp. The operator 125 thereupon completes the quotation or word being set up and then waits for the light to be' extinguished. As soon as the transmitbetween the'stud and the spring is broken andfthe opera-tor., then 'resumes werken thek keybbara. i y

Ogrqztzfbn vof setting-tip 'Mechanism' n sto'rf` Ying, transmitter from manuallyv operated key-board.

Onemeans for causing the setting-up mechanism in the `storing transmitter to function from a ykey-board is illustrated in Figure 4. This form of key-board and the method of selecting is the same as used in the well-known VVe'stern Union key-board tape erforator. l I

Re erring to Figure 4, when one of the keys of the key-board, represented byfthe .'key 100, is depressed, itengages certain of the selectable bars 101, determined by its comb 102. TheA selected bars slide. downward and to the right upon fixed rods 103 and cause a rotation of the corresponding selecting fingers 104 about pivot rod 105. The outer ends 106 of the fingers which are thus by interposing4 the ends 106 between the hammer and the lowerl ends of the corresponding bell-cranks 108. There are six cranks 108, one for each of the six selecting impulses of a 'character and a seventh, 109, which controls the energizing of the actuating magnet 74 which advances the settingup arm 27. As the depressed key 100 approaches ,its lowest' point, it strikes bar 110,

and .causes contact 111 to close and therebyl complete a'- circuit through magnet 112.-

Armature 113. rotates shaft 114 anti-clockwise and causes the hammer 107 to carry the ends 106 of the selected fingers upwardly until they impinge upon the lower endsof the corresponding cranks 108, causing` .them to rotate about shaft rod 11/5. The insulated adjusting screws 116` carried by the cranks 108, strike againstone leaf of theirrespective pairs of contacts 117 and this causes the selected contacts to close-and complete circuits to the pairs of ring magnets 8 which' are `connected lto 'the operated contacts. vThe operation of magnets 8 cause the vselecting pins 5 to be pushed outwardly in the drum of the storing transmitter as previously explained. A Y

The feed contact crank 109 being longer than cranks 108 is actuated with each move-v ment of the hammer to close the circuit of the magrnet."74.l While the energizing of magnet 74 coincides with the energizingof the ring magnets 8, it will be remembered that the sep forward of tti/e setting-up arm 27 takes lace upon the defenergizing. mag-l net 74 and hence the hammers 21 return tol p their normal position just before the settingup arm 27 is advanced to the next row of pins. -4

The transmitting contacts 32 onthe `storing transmitter are electrically connected as shown, to segments onl one ring of the distributing transmitter TD, thebrushe's B of which rotate continuously at a constant speed as is well understood. These contacts in turn, through -the distributor segments and brushes, act on the line transmitting relay LR which sends the marking vor spacing signals to line.

As 'the last contact No. 5 on thesegmented ring of the distributor has actuated the line relay LR, a segment S on the local dis-y tribntor ring operates the magnet 70, which steps forward the transmitting arm 30 on the storing transmitter. This advances the transmitting shoes 31 to the next row of pins 5 and anew selection is thereby made ready when the distributor brushes reach the first or shift segment on the transmitting ring of thel distributor.

`WVhen the transmitting arm 30 advances sufliciently close to the setting-up arm 27, the projection 77 acts to open contacts' 76, as previously explained, thereby opening the circuit through the stepping magnet on the transmitting arm and removing ground from the transmittingcontacts. -'The arm cannot advance therefore, until more selections are set up and Whilecontact 76 remainsv open, the line transmitting relay LR does not receive any` impulses and sends only ,spacing `current to the line.

Us@ of storing transmitter rzotwr .9g/stems.

It will be evident to telegraph engineers that this storing transmitter may be used instead Iof thetape transmitter in multiplex, Morse and automatic stock ticker systems. A

In using' the storing transmitter for the los control of automatic transmission for` stock e tongues and contacts o't' ting contacts on the transmitting arm 30 of the storing transmitter.

The operation of the storing transmitter when substituted for the tape transmitter in the ticker system described in'said application will be evident. After the preparation of a selectionin the form of pins 5 pushed outward from the drum 1 -of the storing transmitter, the transmitting arm ad- 'vances the transmitting shoes 31 to the pin selection and causes the closing of the transmitting contacts 32, 36 corresponding to the character selected. These contacts complete ments of the A and B selector heads' on the ticker transmitter shown in said application. The brushes of the ticker transmitterwiping over the selector heads, complete a circuit to the stop magnet when they reach the `line of segments correspondlng to the character selected and, as described in said application, the energizing of the stop magnet sto-ps the rotation of the tickertransmitter shaft and causes the ticker to print the desired character. The closing of. the operating contact on the ticker transmitter starts the operation of the control relays and at the same time energizes the stepping magnet 7 0 on the transmitting arm 30 of the storing transmitter which on its return stroke advances the arm with the transmitter shoes to the next line of pins.

As' previously noted, the top .shoe 31 on the transmittingar'm is shown in Figure 5 one row of pins in advance ofithe other five shoes. This controls the shift selection for each character which is necessary in automatic ticker transmission.

We claim 1.4 In a telegraph system, a signal storing transmitter; comprising a stationary drum or cylinder, a series of sets or groups of permutation elements positioned upon axial planes of the cylinder and slidably mounted in radial apertures therein, a setting-up or selectingv carrier rotatable about the axis of said cylinder, selectable members mounted on said carrier for successive engagement wvith said sets of elements, a transmitting carrierrotatable axially of saidA cylinder, and circuit closerspositioned on said transmitting carrier for engagement successively with the selected elements.

2.v In a storing transmitter as set forth in claim 1, said permutation elements compl-Esing pins provided with yieldable means frictionally engaging the walls of said aper- I tures to hold the pins in any set position.

3. In-a storing ltransmitter as setforth in claim 1, means for rotating said carriers independently of each other.

4. In a storing transmitter as set forth in r'claim `1, said vcylinder having a peripheral rack, said carriers being each provided with a pinion andratchetmechanism engaging said rack, andy an vactuating magnet to operate said mechanism to impart a step by step movenient to the carriers.

l5. A storing fitr nsmitter comprising a trollin stationary drum or cylinder, a transmitting carrier axially rotatable about said cylinder, circult controlling elements mounted on the carrier, permutation pins arranged in sets or groups, slidable in radial apertures in said cylinder and selectively movable into the paths of respective ones of said circuit conelements, a selecting carrier rotatable axially of saidicylinder and having a set of permutation controlling elements lo,

cated within the cylinder operatingv to Shift the pins of a set selectively in varlous combinations depending upon the signal to be transmitted by that set, meansto rotate said carriers independently, and mechanism tov actuate said permutation elements as they areI brought successively opposite each set of pins, said mechanism having a. single I'eciprocable `member for each permutatioh element operatively connected therewith to actuate the same in any position.

G. A storing transmitter of the type described, comprising a stationary drum or cylinder, a transmltting carrier axially rotatable about' said cylinder, circuit controlling elements mounted on said carrier and lmovableexteriorly of said cylinder, permutation pins mounted in radial apertures in the cylinder and selectively movable into' the path of respective ones of said circuit controlling elements, the latter being adapted to slide upon the sides of the selected pins and thus exert no force' to change the position of the pins.

7. In a device of the type described, a cylinder or drum, a carrier arm axially rotatable about the cylinder, and means to actuate said carrier, comprising a pawl and ratchet driving mechanism' and means restricting the movement ofthe pawl arid permitting it to move over only one tooth of the ratchet at atime and preventing any overthrow of said pawl due to the inertia of the mass of .the moving parts.

-8. A storingl transmitter, comprising :1 stationary drum or cylinder,- permutation pins carried thereby and arranged in groups or Sets, hammers mounted upon a carrier rotatable axially of said cylinder ,to position said hammers opposite said sets successively, a series of rings positioned in planes parallel to said 'pins and operatively connected respectively to -said hammers to permit the' latter to move circumferentiallv thereabout, stationary magnets having their armaturessoperatively connected to recipro-4 cate said rings parallel with the axis of the cylinder, and a keyboard selecting mechanism to selectively energize said magnets in variousy combinations depending upon the signals to be transmitted.

nder in vertical rows, a setting-up' or selectsuccessively by the selected pins in said sets, ing carrier rotatable within the cylinder and and means for rotating said carriers indehaving actuating members arranged to move pendently of each other. 10

said sets of pins successively into selected In testimony whereof We aix our signa- 5 combinations, a transmitting carrier rotattures. v

able exteriorly around said cylinder and EVAN R. WHEELER. having circuit closing members actuated ROBERT F. DIRKES.

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