US2121873A - Telegraph printer - Google Patents

Description

June 28, 1938.

M.- HEBEL ET AL TELEGRAPH PRINTER Filed Aug.'l8, 1957 5 Sheets$heet 1 INVENTORS June 2 8, 1938. M. HEBEL ET AL 2,121,873

TELEGRAPH PRINTER Filed Aug. 18, 1937 5 Sheets-Sheet 2 June 28, 1938. M. HEBEL El AL TELEGRAPH PRINTER Filed Aug. 18, 1937 5 Sheets-Sheet 3 M12 Galidfl'myer BY 4 W rizey June 28, 1938. M. HEBEL ET AL TELEGRAPH PRINTER Filed Aug. 18, 1937 s-sheets sheet 4 [Wm Taxes Maria? HeeZ d" Kari Gzmdymyer M. HEBEL ET AL TELEGRAPH PRINTER Filed Aug. 18, 1937 June 2a, 1938.

5 Sheets-Sheet 5 [Mi a/r02: Mar/m 6%62 4 Karl Gafidfimyer Alto new.

construction of such type printing telegraphs and,

Patented June 28, 1938 TELEGRAPH PRINTER Martin Hebe], Hechendorf-on-Pilsensee, and Karl -Gundlflnger, Frankfort-on-the-Main,

many

Ger-

Appiication August 18, 1937, Serial No. 159,724

In Germany August 22, 1936 22 Claims.

Type printing telegraphs employ ,as a rule trains, for example, of five current impulses for the transmission of the various signals. The keys of the transmitter control an appropriate number of permutation'members which determine the operation of one or more transmitter contacts. If the permutation members are actuated directly by the keys, depression of the keys is made difficult and it has, on' this account, been proposed that the permutation members should be displaced by springs controlled by the keys. With this system, a key, when depressed, lies in the path of one or more permutation members and allows or prevents the setting of the selected permutation members. The springs under the influence of whichthe permutation members are set are energized by a motor which .also is used to control other parts of the type printing telegraph.

The purpose of the invention is to simplify the in particular, to avoid the necessity of providing a motor for controlling the various parts. In

"accordance with the invention, a magnet is provided which is energized before each transmission and thus sets the permutation members and energizes their springs. Furthermore, when a transmitter key is actuated, the permutation members are released by a control member common to all the keys so that they can be set by their springs. This is effected by putting the magnet temporarily out of action. Thus, the necessity for using a driving motor to avoid direct control of the permutation members by the keys is eliminated and the keys can be struck'without being loaded by the permutation members. The common controlling member ispreferably such that, on being actuated, it not only causes the magnet to be put out of action but also looks the permutation members in the position which they have assumed under the influence of the depressed key until the current impulsetrain has been transmitted.

An example of construction of a type printing telegraph in accordance with the invention is shown in the accompanying drawings in which:-- Figures 1a and 1b show in perspective the relative dispositions of the keys and the permutation members.

Figures 2 to 7 are detail views illustrating the positions taken up at various times by various parts of the apparatus and 7 Figures 8 and 9 show two suitable circuit arrangements for the actuation ofthe telegraph transmitter. V

parts of the bars SB which lie beneath the guide members L. When the magnet MAN is ener-.

gized, its armature lifts the ends SK against the action of the springs bkl--bk and brings the parts of the bars SB lying beneath the keys out of range of the keys. The springs bkI-bk5 arecontact springs, and are arranged so that the contacts controlled by them are reversed when the bars SB are moved. The bars SB also have hook shaped ends SP (Figure 1b) which can engage with the end PH of the armature MHA of a magnet MH.

A T-rail US and a further rail GS are disposed beneath guide members L which have gaps in them into which the rail US can enter. The rail US is under the action of a spring UF (Figure 1a) which tends to draw the rail forward (as seen in Figure 1) or to the left (as seen in Figures 2 to 7) The rail US is connected to the armature UA of a magnet U by a part UT joined to the armature at UG. This armature UA controls a pair of contacts ul and ull, the contact ul being actuated during the first part of the movement of the armature and the contact all only during the last part of the movement of the armature. The T-rail US can be influenced by each and every key, the rail GS only by two'special keys T2 and TB which operate through the guide members LZ and LB and serve to effect the letterfigure and figure-letter shifts. The two keys swing the rail GS in opposite directions. The rail GS has a pin GA (Figure 1b) which drops into a resilient seat GR and thus holds the rail in one or the other of itstwo positions. The rail GS lies beneath the parts LP (Figure 2) of the guide members of one of the groups of keys, 1. e., the letter keys ,or the figure keys, and thus prevents the keys of that group from being struck.

The lower part LK of the guide members L is serrated in accordance with'the setting of the bars SB which it is to determine. The bars SB themselves could, of course, be serrated and the edge LK of the guide members L be plain. When a key is struck, some of the bars SB are held depressed against the action of their springs bk while others are allowed by the gaps in the parts LK to move up under the action of their springs bk.

As already mentioned, the rail US can be turned on its pivot by each and every one of the guide members L. Figure 2 shows the guide member Ll of a letter key and the guide member L2 of a figure key and the common rails US and GS. The rail GS lies under the part LP of the guide member L2 of the figure key so that only the letter key can be struck. The guide members, have extensions LU which can act on the common T-rail US. If, for example, the guide member Ll is depressed, the rail US is swung to the right (Figure 2), sliding on the right hand surface of the extension LU. This surface has two parts sloping at different angles so that the rail US is moved in two steps, the first of comparatively great and the second of comparatively small magnitude. The pivotal movement of the rail US is transferred by means of the connecting member UT (Figure 1) through the joint UG to the armature UA, which, during the first part of its movement actuates its contact ul and closes a circuit for the magnet U so that the latter completes the attraction of the armature. This causes the rail US to swing clockwise (Figure 3) so that the head of its T leaves the side face of the extension LU and abuts against the left hand face of an extension LR of the guide member Ll. When the key is fully depressed as is shown in Figure 3, the cross limb of the rail US enters a notch in the extension LR and as long as the rail US is held in this position, that is to say, as long as the armature UA remains fully attracted, the guide member and its associated key cannot be moved upwards. In this position, the contacts ull are also actuated by the armature UA for a purpose to be described later on. When the rail US is in the notch in the extension LR of the depressed guide member, its cross limb lies beneath the extensions LR of the guide members of the other keys and prevents these keys from being depressed.

The guide members LB and LZ of the shift keys TB and T2 have the same extensions LU and LR as the guide members of the other keys. They are, however, constructed so as to be capable of actuating the rail GS so as to prevent actuation of one set of keys (letters or figures). For this purpose, the guide member LZ has an extension LG which, on being depressed, pivots the rail GS clockwise (Figure 5) while the left hand face of the extension LU is such that on being depressed, it pivots the rail GS counterclockwise (Figures 6 and 7). The figure keys or the letter keys are thus prevented from being actuated.

The magnet MAN (Figure 1a) is always preparatorily energized so as to remove thebars SB from the path of the guide members of the keys. As soon as a key has been completely depressed and the rail US can drop into the locking position, the contact all is actuated by the armature UA and opens the circuit for the magnet MAN. The armature UA then drops and releases the bars SB. The bars which have notches opposite the depressed guide member can now be lifted by their springs bk; the others remain in the pivoted position. The contacts controlled by the springs bk are now actuated in accordance with the combination to be sent out. A distributor is provided for transmission of the selected train of impulses. As soon as the train has been transmitted, the magnet U is tie-energized and opens the circuit train associated with the rail US moves out of the locking position under the action of the spring UF. The depressed guide member and its key are released and are able to return into the normal position.

In-order to allow the depressed key to be re-set earlier, a magnet MH is provided the energization of which. is determined by thecontact ul l. The'hook shaped extension PH of the armature MHA of this magnet engages in the hook ends SP of those of the bars SB which have been able to return into their normal position and beneath the hook ends of the bars which remain in the displaced position. The setting of the bars SB and thus of the contacts actuated by the springs bk can be maintained independently of the position of the guide member of the depressed key, and the relay U can thus be de-energized as soon as the magnet MB is energized.

In the circuit arrangement shown in Figure 8, the five contacts controlled by the bars SB are designated lflcl-bk5. The distributor controlling the transmission of the trainof current impulses'comprises six relays A to F controlled by a cadence tapper consisting of the relays N and 0.

When a signal is to be transmitted, the key AT is depressed so that the relay AN is energized and closesa holding circuit for itself .at its contact anl. The contact an2 closes the circuit for a thermo relay Hi which heats up slowly. If no signals are sent out within a pre-determined period of time, the relay Hi closes its contact hi and thus short circuits the relay AN which releases. The contact an3 closes a circuit for the magnet MAN which responds and preparatorily pivots the transmitter bars SB (Figure 1). If, now a key is depressed for the transmission of a particular signal, the rail US and the armature UA of the relay U coupled to the rail are pivoted through the guide member L. About midway through the movement of the key, the contact m is closed by the armature UA and the relay U is thus energized and attracts its armature UA. The armature UA however cannot be brought into the attracted position until the key has been fully depressed and the rail US can enter the notch in the extension LR in the guide member. When this happens, the. contacts ull, u|2 and M3 corresponding to the contact all shown in Figure 1 are reversed.

The contact 11.! l closes a circuit for the winding I of an auxiliary relay VS which is kept energized during the transmission of a signal by the contact us3. The contact ul2 closes the circuit for the transmitter relay S before relay US responds. The relay S controls the flow of current through the line VL by means of its contact s. The contact us! of the relay VS closes a circuit for the relay N of the cadence tapper. The contact 11.13 for the magnet MAN so that the latter allows its armature to drop and releases the transmitter bars for displacement by their springs. The contacts bkl to bk5 are thus actuated in accordance with the current impulse the depressed key. The magnet MH, the armature of which holds the bars SB in the position they have assumed, is energized when the contact cs4 closes.

The two relays O and N of the cadence tapper work like a relay interrupter. The relay N energizes the relay 0 and the latter opens the circuit for the relay N. The delay in response and release of the relay N is approximately 8 milliseconds and that of the relay 0 approximately 12 milliseconds. An interval of 20 milliseconds is therefore necessary for the successive ener ization and de-energizationoi thetwo relays. Each .1 impulse which ,is emittediby the relay 8 is also to have a duration'oi lid-milliseconds, At each .responseandateach release. therelay O actuates a relay ofIthechain of relays A-F, The relay A (windingl) was energized on response of the relay VS.- By means of its-co I tact al, it closes a holding circuit through its win'ding II and also prepares a circuitior'therelay B. It relay responds after 20 milliseconds, =zthe relay B is energijz'ed and, by .meansr ohcontact bl, w closes a holdingjcircuit throughitswinding II and prepares a circuit for the relayC, Q IL'after a fur- ,ther'20 milliseconds, the/relay O releases, the Icircuitfor the relay C is elo sed. Ina similar mannenthe relays 'A B C, D, E andF are energized successively at. intervals or 20 milliseconds. sac et these relays determines one of the impulses to'besentfoutL, I I I The relayA, in responding, opens the circuit for the relay S which:was closed when, thev contact ui 2 closed. -Thi s'terminates the emissionof the so- 'calld 'star'tf impulse which prepares the receiving devices at the other end 01' the line. I The contact a2 makes the circuit of the relay S dependent upon the contact bkl. If]. the position fof the associated fbar SB, s such that this con-- tact is closed, for example, the relay Sis again remains under the influencef oi f oneof the con- I .tactsbk for a period of, 2 0. milliseconds. A train or; current impulses of uni iorm length is therefore transmitted bythecontacts bk. Simultaneouslywith the ,energization of relayC which takes placeon transmission of @the third selecting impulse,' a relay DR is energized and-by means of contact dr'l', interrupts the circuit for I the elay U. I The relayU allows its armature to drop,

herail US returns .into thenormal position and 45ig't'hef depressed key can; together with itsguide I piece move back I into the, normal position, The

setting of I thebars SB. and of the contacts bk controlled, by. them is however maintained by i t energizaj h, oi the, magnet .MH. At, the beginning of the transmission of the fifth select- I ing, impulse, the relayoEprespondsand, bymeans {of its contact e2,

opensth'e circuit for the magnet I'he, relay MH dropsrafter. a, delay of approximately 20 milliseconds and, -after the transmission of the nan-,imnune, releases the transmitter barsSllsothatthey can drop back into their normal position.,,-If the armature of the relay U hastalready dropped; :the magnet has already. he e n. energizedagain by, way or the contact ul 3.- As,

long as, the. bars SB are blocked by the armature of the magnet MIL-the magnet MhN cannohattract .its armature. As I soon however, asthis blockinghas been released, the magnet MnNattracts its armature and paratorily pivots the bars SB At theendof the transmission of. the filth, selecting; impulse, ,the relay F is also energized, and, by means of'its contact opensthe-circuitioi the auxiliary relay V801 the transmittersothat .this'relay drops and stops th 'ev cadence tapperg.v The contact 13 opens: the circuit for": the. j transmitter relay S which drops and, ,by means of its, contact -s,- reestablishes normal conditions inthe line'VL. The

"eontactj f4 interrupts: the holding circuit for the v'vindings'II or the relays A, B' and C which drop the relays thus-return not directly controlled i When,

and thus interrupt'the holding circuits through the windings II of the relays D, E andF. All I to their normal position. The magnet MAN alone remainsenergized under the control of the starting-relay AN. If there is no further signaltransmission for a considerable time, this magnet also'de-energizes on'attraction; 01 the thermo-relay Hi.

except that the magnet MH which blocks the transmitter vbars. SE is omitted. For deenergizing the relay U on the transmission, or the selecting impulses and thus releasing the blocking of the actuated-key, two relaysUR, and ,VR are provided.v The relay UR is controlled by the contact bktand the relay VR by the-contact N05. The circuit of the transmitter relay is, is by the contacts bid and bkS upon the transmission oi the fourth and fifth impulses but by the contacts m2 and 01:2 ofthe two relays UR and VR. The fourth and fifth impulses determined by the contacts blclv and bk5 are stored by the relays UR, and VR. i

at the beginning of the signal transmission, the relay VS isenergized, the contact us5 closesthe circuit for the relays UR, and VR.

vIf the selected combination is suchthat, the contacts bkd and -bk5 are closed; both relays are energized and by means of their contacts ml or orl close holding circuits fonthemselves- If,

on transmission of the third impulse, the relay U is de-energized by the energization ofthe r lay DR and the depressed key is thus released, the key returnsoto its no rmal position and the bars SB: are preparatorily pivoted again by .energization of the magnet MAN. If the relays UR and'VRin sofar as'they have been energized in accordancejlwith the selected combination re.

main however energized independently of the contacts bled and b705, the transmissionof the fourth and fifth impulse of 'theselected combination-is ensured by contacts vrZ and m and the holding I f The circuit arrangement-shown in Figure!) is-- circuit for the storing relays UR and is in- .terrupted at the contact f5 when the .relay F responds after the emission of, the fifth impulse,

Weclaiin: 1

1*. A telegraph transmitter .comprisinga plurality of transmitting keys, a plurality of permutation members influenced by said keys, springs acting on saidpermutation members, a magnet for displacing said permutation members against the action of their springs, acontrol member displaceable; by each-of said keys, meansifor energizing' said-magnet before each transmission,

means controlled by said control means for temporarily putting said magnet out ofaction on actuation of ,one of said-transmitting keys and means ifor emitting a train of currentimpulses determined by the setting 7 ofsaid. permutation members. I I I I 2. A telegraph transmittercomprising. a pinrality of transmitting keys, a plurality of permutation members, springsacting on said permutation members. and strivingto move them against said transmittingkeys, I a, magnet for, displacing said permutation members against the action of their springs, a control member displaceable by each or said-transmitting keys, means ,for energizing said magnet before each I transmission, means controlled by-said control memberfor-temporarily putting said magnet out-of action at-each actuation of said transmitting keys, means controlled by said contr'ol'rnember for locking said i; assume under the influence of their springs when said magnet is put out of action, means for sending out a train of current impulses determined by the setting of said permutation members and means for releasing said permutation members after transmission of said current impulse train.

3. 'A telegraph transmitter comprising a plurality of transmitting keys, a plurality of permutation members, springs acting on said permutation members and striving to move them against said transmitting keys, a magnet adapted to displace said permutation members against the action of their springs, a control member controlled by said transmitting keys, means for energizing said magnet before each transmission, means controlled by said control member for temporarily putting said magnet out of action at each actuation of one of said transmitting keys, magnetically controlled means for locking an actuated transmitting key in the depressed condition and means for transmitting a train of current impulses determined by the setting of said permutation members.

4. .A telegraph transmitter comprising a plurality of transmitting keys, a plurality of permutation members, springs acting on said permutation members and striving to move them against said transmitting keys, a magnet for setting said permutation members against the action of their springs, a control member controlled by said transmitting keys, means for energizing said magnet before each transmission, means controlled by said control member for temporarily putting said magnet out of action at each actuation of one of said transmitting keys, a magnet for locking an actuated transmitting key in the depressed position and for holding the remaining keys against actuation and means for transmitting a train of current impulses determined by the setting of said permutation members;

5. A telegraph transmitter comprising a plurality of transmitting keys, a plurality of permutation members, springs acting on said permutation members and striving to move them against said transmitting keys, a magnet for setting said permutation members against the action of their springs, a control member controlled by said transmitting keys, means for energizing said magnet before each transmission, means controlled by said control member for temporarily putting said magnet out of action at each actuation of one of said transmitting keys, a magnet controlled by said control member for locking said permutation members in the position they assume under the influence ,oi their springs when said magnet is put out of action, means for transmitting a train of current impulses determined by the setting of said permutation members and means for releasing said locked permutation members after said train has been transmitted.

6. A telegraph transmitter comprising a plurality of transmitting keys, a plurality of permutation members, springs acting on said permutation members and urging them against said transmitting keys, a magnet adapted to displace said permutation members against the action of their springs, means for energizing said magnet before each transmission, a control member common to all said keys, a magnet acting on said control member and holding it in a position in which it locks an actuated transmitting key in the depressed position and holds the undepressed transmitting keys against actuation, contacts adapted to be actuated by said control member in its locking position whereby to put said first mentioned magnet out of action and means for transmitting a train of current impulses determined by the setting of said permutation members.

'7. A telegraph transmitter as claimed in claim 1 comprising also contacts adapted to be actuated by the control member in its locking position whereby to bring into operation said current impulse transmitting means. I

8. A telegraph transmitter comprising a plurality of transmitting keys, a plurality of permutation members, springs acting on said permutation members tending to move them against said transmitting keys, a magnet adapted to displace said permutation members against the action of their springs, a transmission starting key, a contact controlled by said starting key, a holding relay controlled by said contact and adapted to close a circuit for theenergization of said magnet, a control member common to all said keys, a magnet acting on said control member and adapted to hold said control member in a position in which it locks an actuated transmitting key in the depressed position and to hold the unactuated transmitting keys in the raised normal position, contacts adapted to be actuated by said control member in its locking position whereby to put said first mentioned magnet out of action and means for transmitting a train of current impulses determined by the setting of said, permutation members.

9. A telegraph transmitter as claimed in claim 8, comprising also contacts controlled by said transmitting keys during the depression of a transmitting key for energizing the magnet acting on said control member.

10. A telegraph transmitter comprising a pinrality of transmitting keys each provided with a guide member adapted to be displaced with its associated key, a plurality of permutation members, a spring acting on each of said permutation members and urging it against the guide member of a depressed transmitting key, a magnet for displacing said permutation members against the action of their springs, means for energizing said magnet before each transmission, a contact adapted on actuation to de-energize said magnet, projections on said guide members, a rail adapted to act on said projections whereby to hold the guide member of an actuated transmitting key in its displaced position and to preclude displacement of the guide members of the unactuated transmitting keys, a magnet for controlling the movement of said rail, means for energizing said magnet, said means being controlled by the guide member of a transmitting key during the first part of the movement of said key controlled by said rail in its locking position for controlling said contact and means for transmitting a train of current impulses corresponding to the setting of said permutation members when freed by said magnet.

1 A telegraph transmitter as claimed in claim comprising also means for putting out of action said rail controlling magnet after said current impulse train has been transmitted.

12. A telegraph transmitter as claimed in claim 10 comprising also means for locking said permutation members in the position which they assume under the influence of their springs after their setting magnet has been put out of action, said means being controlled by said impulse transmitting means during the transmission of said train, means for putting out of action said rail controlling magnet, said "means being controlled e *byI-said current impulse transmitting means after -actuation o!- said permutationmember lockin 7 means, and means torreleasing said permutation m mbers after the transmission oi said current impulse-tram: x a

j 'l3. A-telegraph transmittercomprising a'plu-g 'rali t'y or transmitting k'ey's each provided with aguide member, a plurality of permutation'members, springs acting on-said permutation members against the guide member or-a. .depressed transmittingfrkfl. contacts controlled- I 'i-jrality of transmitting keys each provided with a and 'urging them by said permutation-members, a magnet for dis-' the permutation members,

placing said permutation members'againstjthe acorenergizing said magnetbeioreeach transmission, means for lock- *ing the guide member of-a depressed transmitting key,- sa'idamea ns preventing: guide members or the undepressed keyaya .contact controlled. by said last-mentioned means for putting ;out oi' a'c'tion the magnet for displacing means for transmit- 1 tion-or their springs, means ting a train of current. impulses corresponding to -t'he ,settir ig oi, said contacts controlled by said permutation members and said guide member locking means adapted to put current, impulse transmltting means into action; v 7

.14. A telegraph transmitter as'claimed in claim x .f 13, in'wh ich said permutation member contacts filtation members.

are carried 'by' the springs acting onsaid permu- 15. A telegraph transmitter comprising a pluralityof transmitting keyseach provided with a guide member, a plurality of permutationmem-fi bers, springslactin bers and urging them against the guide member 01' a depressed transmitting key, contacts controlled by said for displacing said permutation members against means'for energizing I permutation members, a magnet the action of their springs, said magnet before. each transmission, means ,for locking the guide member mitting key and for preventing actuation of the undepressed keys, a contact controlled by said last-mentioned means for putting out oi action the magnet for setting the permutation members, a current impulse transmitting relay, a distributor connecting said transmitting relaylsu'ccessively in circuits dependent upon the various contacts controlled by said permutation mem-' bers and means controlled by said ide member locking means for putting said distributor into action.

'16.- A rality. of transmitting; keys each provided with a guide member, -.a" plurality of permutation .members, springs acting on said-permutation members and urging said permutation members against the guide member of a depressed transmitting key, contacts controlled bysaid permutation members, a magnet for displacing said permutation members against the action of their springs, means for energizing said magnet before each transmission, means for locking the guide member of a depressed transmitting key and for preventing movement of the guide members of the undepressed keys, v

said last-mentioned means for putting out of aca contact controlled by tion the magnet for setting the permutation mem [bers, storing relays controlled'by the contacts of some of said permutation members, a current impulse transmitting relay,a distributor adapted to connect said transmitting relay successively in circuits dependent upon said permutation member contacts and in circuits dependent on said stori ng relay contacts and means controlled by saidjguide member locking means for putting .saiddistributor into action;

movement oi the ated transmitting key, a magnet having an armajarmature near the I actuated by the guide member of a transmitting means controlled by magnet, said armature her into a position-in member of a depressed ment of the guidemembers of the remaining g on said permutation mem l of a depressed trans-- telegraph transmitter comprising a pin 1'7. A telegraph transmitter as claimed in claim 16, comprising also'me'ans for releasing said guide membersatter energizationoi said storing relays and means for putting said storing relays out of action after' transmission. of va current impulse train, determined by tion members,

18. A telegraph transmitter-comprising a pluthe setting of a said permutauidetmember, aplurality otpermutation members,'springs,ac ting on said permutation members -andiurging them against the guide member 01' a videpressed-kema controlmember controlled by said guide members .on depression of the associture connected to said control member, a plusaid controlmember pole of said magnet on being key, acontactadapted to be actuated by said armature in being thus brought near said pole and adapted on such actuation to energize said being adapted on being attracted to said pole to swing said control memwhich it holds the guide key and precludes movekeys, afurther magnet for displacing said permutation members against the action of their springs, means for energizing said further magnet before each transmission, a contact adapted to de-energize said magnet-on being actuated by *rality of transmitting keys'each provided with aguide member, a plurality of permutation members, springs acting on said permutation members and urging them against the guide member of a depressed key, said guide members on depression of the associa control member controlled by ated transmitting key, a magnet having an armature connected to said control member, a plurality of contacts controlled by said armature, said control member being adapted to bring said armature near the pole of said magnet on being actuated by the guide member of a transmitting a contact actuated on such movement of said armature whereby to energize said magnet, said armature on being attracted to said pole being adapted to swing said control member into va. position in which it holds-the guide member of a depressed key and precludes movement of the guide members of the remaining keys, a further magnet for displacing said permutation members against the action of their springs, means for energizing said further magnet before each transmission, a contact adapted to de-energize said further magnet on being actuated by said armature when it strikes the pole-of its magnet, a current -impulse transmitting relay, contacts con trolled by said permutation members, a distributor connecting said transmitting relay successively in circuits dependent upon said permutation member contacts, a contact controlled by said armature for putting said distributor into action and means controlled by said distributor for putting said flrstmentioned magnet out of action.

20. A telegraph transmitter as claimed in claim 19, comprising also a magnet for locking said permutation members in the position which they assume under the influence of their springs. means for switching in said magnet, said means being controlled by the contact of the armature connected to the control member when it strikes the pole of its magnet, means actuated by said distributor during the transmission of the current impulse train for putting said magnet out of action and acting on said control member and means actuated by said distributor after the transmission oi. said current impulse train for putting out of action the magnet controlling said permutation members. i

21. A telegraph transmitter comprising two groups of transmitting keys, two shift keys, guide members connected to said transmitting keys and to said shift keys, a plurality of permutation members, springs acting on said permutation members and urging them against the guide member of a depressed key, a magnet for displacing said permutation members against the action of their springs, a control member adapted to be actuated by the guide members of all said keys, means for locking the guide member of a depressed key and for preventing movement of the guide members of the remaining keys, said means being actuated by said control member on being actuated by a guide member or a key, means actuated by said locking means for putting said magnet out of action, a rail controlled by said two shift keys and always looking one of said groups of transmitting keys and means for transmitting a train of current impulses corresponding to the setting of said permutation members under the influence of their springs.

22. A telegraph transmitter as claimed in claim 21, in which the guide members of the two groups of transmitting keys are provided with various A projections and in which the rail controlled by the two shift keys is pivotally mounted beneath the guide members of the transmitting keys and lies in each of its two positions in the path of movement of said projections of the guide members of one of said groups of transmitting keys.

MARTIN HEBEL. KARL GUNDLFINGER.

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