US2247162A - Start-stop code transmitter - Google Patents

Description

June 24, 1941. a C I 2,247,162

J START-STOP CODE TRANSMITTER Filed July 22, 1938' 6 Sheets-Sheet I r O as 45 14 4'6 [1 IN I o o 1 33 2a 4a a YWQ/I'Vt/OO GIUSEPPE BECCIO.

June 24, 1941. e. BE CCIO START-STOP CODE TRANSMITTER Filed July 22, 1938 6 Sheets-Sheet 2 gvwem/foa GIUSIEPPE BECCIO.

June 24, 1941. G. BECCIO START-STOP CODE TRANSMITTER Filed July 22, 1938' 6 Sheets-Sheet 3 3 H4: em tw GIc/SEPPE BEcc/o.

June 24, 1941. BECCIO 2,247,162

START-STOP CODE TRANSMITTER F iled July 22, 1938 e Sheets-Sheet 4 JUNE 24-, G, C Q START- STOP CODE TRANSMITTER Filed July 22 1958 a Sheets-Sheet 5 3 1 1 0 M4404; GIUJSEPPE BE cc/o.

June 24;, 19411. G. BECCIO 2,247,H62

START-STOP CODE TRANSMITTER Filed July 22, 1938 6 Sheets-Sheet s GwsEPPE Baa/o.

Patented June 24, 1941 START-STOP CODE TRANSMITTER GiuseppeBeccioylvrea, Italy, assignor to Firm Ing. C. ()livettikiz 0., S. A., Ivrea, Italy Application -July 22, 1938, Serial No.I220,682

. In Italy May 2, 1938 9 Claims.

This invention relates to the mechanism for the transmission of signals in machinesof the 'unrhythmical type known as start-stop and controllable from a distance, in which the depression of each key of the keyboard brings about the displacement of ,five code bars'to form any one of 32 possible combinations each corresponding to a signahand of which areallocated to the operation of the machine for the purpose of (1) spacing the letters, (2) lines feeding (3 shiftingthe letters to symbols and vice-versa (4) carriage returning. The remaining 27 combination'seach correspond to two signals, one a letter and the other a symbol. 1

In these machines the depression of each key efiects the composition of the corresponding code and the making of a connection which sets a series of suitably spaced cams into rotation, these cams serving to spread over a given period of time and to send into the line the electrical current transmission impulses which reproduce the formed code, as Well as the two impulses for the starting and stopping of the receiving apparatus.

In those machines in, which'the code bars directly transmit the selection of impulses, a-neW code cannot be produced until the immediately preceding code has been entirely transmitted, and for the purpose of avoiding this possibility these machines normally embody a blocking arrangement which prevents the too rapid depression of one key after another. Asa consequence it is necessary for the operator to carry out the transmission with extreme regularity in order to achieve the greatest operating speed which the machine will permit, and this is only achieved in exceptional cases. Furthermore in known machines the change-over from letters to symbols is carried out by depressing-special keys, and very close attention on the part of the operator is called for if no attempt to write letters is made when the machine is set for symbols and viceversa, Mistakes of this kind can be prevented by the use of suitable blocking arrangements, or one may equally well employ the two supplementary keys described below.

The arrangement according 'to the invention enables two keys to be operated in succession in less time than is necessaryior the transmission of a signal and with a variation of the regularity of the rhythm which is necessary with known machines, so that it is made possible to attain a mean speed of operationwhich is very close to the maximum speed possible with the machine, and even by inexperienced operators.

The invent-ion further provides'for the automatic change-over from the position of letters to that of symbols and vice-versa when, after the transmission of a certain number of letters or symbols it is required to transmit symbols or letters. Upon each conversion of this kind the transmitting apparatus automatic-ally emits the code symbols or the code letters, whilst the codeof the symbol or of the letter remains registered or stored in the transmitting apparatus and is transmitted as soon as the change-over has been effected. In this way, upon the depression of a key corresponding to a symbol, or to a letter,

after letters or symbols have been transmitted,

the camshaft makes two revolutions instead of one and during the first revolution transmits the code symbols or the code letters whilst during the second rotation there is transmitted the code of the symbol or of the letter corresponding to the key which was depressed.

The nature of the invention will be better understood from a consideration of the accompanying drawings, in which i Fig. 1 shows the apparatus at rest;

Figs. 2 and 3 show the apparatus in two positions which they may occupy during the transmission of a code;

Figs. 4, 5, 10 and 11 show various operative positions of the mechanism for effecting the automatic change-over from letters to symbols;

Figs. 6, 7, 8 and 9 show details of the mechanism;

Figs. 12 and 13 show an arrangement for pre-'- venting the release of the group of cams during the change-over;

Figs. 14 and 15 illustrate an arrangement controlling the ultimate displacement of the commutating bar when the machine operates with an automatic response.

Figs. 16 and 17 show a modified arrangement permitting an increase in the speed of operation.

It is necessary, however, to consider the manner in which the results of two successive key depressions are registered or collected. Fig. 1 shows this arrangement at rest. The five code bars I'provided with teeth 2 which are inclined from right to left, are displaced from right to left as a re sult of the depression of one of the key levers '3. These bars slide upon the'pins 5 which engage in slots 6 to determine the final positions at the right or at the left.

A universal bar I provided with pivot pins is mounted parallel to the code bars I. Bar 1 is also provided with teeth which are inclined in all cases towards the right so that the depression of any key effects a displacement of the bar 1 towards the left. After the operation of the key the spring 8 serves to return the bar I to the right. The bar I is pivotally connected at 9 with a balance beam III which is capable of oscillating about an axis II. To this balance beam is connected a toothed pawl I3 through the medium of a pivot I2. A spring I4 urges the pawl I3 downwards in such a manner as to cause it to engage with the outwardly bent extremity I5 of a lever I6 which is rigidly connected, through the medium of a spindle II,

with a lever I8 which, when displaced in such a manner that its lower end moves to the right, disengages itself from a tooth I3 on the coupling member which effects the rotation of the shaft carrying the transmission cams. It will be seen that the displacement of the bar I to the left effects a displacement to the right of lever I8 and also effects the rotation of the camshaft 20 which is arranged to make one complete revolution for each signal transmitted. The extremity 2I of the pawl I 3. however, does not move from the path of the projection on cam 22, and thus even if the key is maintained depressed for a period of time which is greater than that necessary for the complete rotation of the camshaft, the pawl I3 is raised and disengaged from lever I 6 so that the extremity of lever I8 is urged by the spring 23 to re-enter the position shown, thus breaking or opening the coupling when the rotation has been completed. When the key is released the Whole system returns to the normal position under the tension spring 8 and the tooth of the pawl I3 engages with the tooth. I5 to reestablish the initial conditions for the despatch of a further signal. Upon the shaft 20 is fixed a cam '24 which actuates a roller 25 mounted upon a lever 25 arranged to oscillate about an axis 21. A link 28 connects lever 26 with a further lever 29 which is rigidly mounted upon a shaft 30 upon which is also rigidly mounted a frame 3I which embraces five levers 33 arranged parallel to one another and corresponding respectively to the code bars. The ends 34 of the levers 33 are formed with points which lie opposite to the extremities 4 of the code bars, which are also pointed. Each of the levers 33 is connected to the frame across five springs 32 and through a pivot 36 with a corresponding balance beam 31 which is capable of rocking about an axis 38. The five balance beams 31 are" in turn connected respectively through a pivot 39 to five slides 40 which move through the engagement of slots therein with guide pins 4| and 42.

At the commencement of rotation of the shaft 20 the cam 24, through the mechanism described, effects a displacement of the frame 3I and also through the springs 32 of the five levers 33, and thelatter are caused to engage by their pointed ends 34 against either the right or the left. hand face of the pointed ends 4 of the code bars.. The face engaged with depends upon the position which the code bars have taken up. As a result, the levers 33 are displaced to the right or to the left and the balance beam 31 is caused to rock to move the slides 40 which reproduce the code formed by the bars I.

In Figs. 2 and 3 is illustrated the manner in which the displacement of the slides in one direction or the other is produced according as the code bars have been moved to the right or to the left.

Opposite the slides 40 (Fig. 1) are arranged five levers 43 which are capable of oscillating about an axis 44 and are so urged by springs 45 that a projection 46 on each is maintained in engagement with the respective cams 41 which are suitably freed. In view of the necessity of providing for the automatic commutation as is described below, the central one of the five levers 43 consists of a single piece as shown in Fig. 6, while the others are each formed of two pieces 43 and 5fl as shown in Figs. 7 and 8 connected to one another after the manner of tongs by a pivot 48. The pivot 49 which is interposed between the two pieces has the effect of renderin'g them rigid with regard to one another and prevents the raising of the projection 46 until the slide engages with the extremity 50. The projection 46 may enter into a depression in the cam' 41 and the lever acts in known manner upon the electrical contacts on the frame only when the slide 40 lies in the position towards the right, whilst in the reverse case the frame 5| responds to the spring 52 and the electrical contact is made to the left. As soon as the high part 'of the cam 24 is moved from the roller 25, the spring 53 serves to lower the ends 34 of the levers 33, thus disengaging the points 34 on the code bars so that the latter become free for the formation of a further signal corresponding to the depression of a further key, and this signal will remain registered until the cam 24 at the end of the rotation effected for the purpose of transmitting the preceding signal, brings about the transfer 'of the code to the slides 43.

It is important to note that during transmis'- sion of a signal the slides 40 are maintained in position directly by the pins 4 and 34 (Figs. 2 and 3) and afterwards by the frame 3I and the teeth 35 (Fig. 1"); without ever being freed as a result of the elastic connection between the frame 3I and :the 'levers 33 achieved by the springs 32, so that the positions of the slides remain always quite definite and fixed through the period of transmission of the signal.

It will be obvious that by varying the angular length of the operative "projecting portion of the cam 24, the time may be varied after which a successive signal can be registered, to remain stored during the'preceding transmission. It is, however, always essential that the new registration shall not be carried out before the cam 22 has disengaged the tooth of the pawl I3 from the tooth l5 and the system comprising the bars I, the balance beam III and the pawl I3 has re turned to its rest position, so that the succeeding depression of a key disengages the coupling anew to permit it to efiect a further rotation.

The manner in which the automatic commutation arrangement operates can now be seen. For greater clearness that part of the mechanism which is concerned with the commutation is shown separately from the rest in Figs. 4 to 17. In the position of Fig. 4 the mechanism is arranged for the transmission of letters. Thecodes formed by the bars ,I (Fig. 1) are transferred to the slides 40 by the mechanism described above and which is therefore not shown in these figures, and thereafter they are transmitted. Beneath the key levers 3 which are parallel to the above described bars and similarly mounted upon the pivots 55, is mounted a bar 54 provided with teeth 2 which are inclined to the right beneath the symbols key levers, and to the left beneath the letters key levers. If a symbol key is depressed after one has written letters, the bar 54 is displaced towards the .left and remains thereduring the .time'that all succeeding symbols are written. It returns to the right when a letter key is depressed and remains there throughout the writing of succeeding letters. The roller 55 which is urged by a spring 56 against a tooth 51 retains the bar in the one or the other of these positions. The bar 54, through the medium of the pivotal connection 58, controls the threearmed lever 59 which is arranged to rock about a pivot 60. The arm 6| serves through a link 62 to control the movements of a frame 63 which is mounted to rock about an axis 64 and which at its upper end carries a transverse member III! which extends over all the slides 40. The arm 65 controls a frame 66 which is rockable about an axis 61. Frame 66 is of a form which presents an arm 68 upon which four levers 69 are pivoted. Each of these levers supports a pivot 49 which is interposed between parts 43 and which form the first pair and the last pair of the group of five levers 43. When the pivots 49 are interposed between the extensions Ill and 'II of these levers, these levers bring about a transmission just as though they were formed in one piece.

A tooth I2 is formed integral with frame 63 and this tooth is adapted to engage with a tooth 53 on the one-piece central lever 43 having the shape shown in Fig. 6. The axis 61 is not fixed, but is mounted upon a frame 13 arranged to pivot about an axis I4. formed rigid with this same frame. The first mentioned lever 15, together with a spring 11, controls the frame I8 in its movements about the axis I9. The frame I8, like frame I3, is provided with a sideways extension which extends over the slides 40. The second mentioned lever 16 is subjected through the medium of a link 80 to the movement of the carrier for the characters or of the carriage of the machine, or in otherwords, the member of the printing part of the machine which takes up two different positions for printing the letters or symbols. The machine is adapted to print letters when the lever It is in the position shown and symbols when in the position indicated in dotted lines in Fig. 4.

In Figs. 1, 2, 3 and 9 the slides are shown as being provided with slots which engage over pivot pins 4| and 42 so arranged as to permit only horizontal displacement of the slides. these slots are of the form shown in Fig. 4 and the following figures, the slot co-operating with pin II being such as to permit only straight-line movements whilst the other slot permits movements in an upward direction. Such upward movements, however, do not take place so long as one of the two frames 63 and I8 lies over the projections on the slides, and only when these conditions are imposed, are the slides adapted to prevent the lifting of the teeth 50 and as a consequence accomplish their operation.

Assuming that a key corresponding to a symbol is depressed, the code bars which are then operated according to the code corresponding to that symbol effect an immediate registration by transposition to the slides 40. As the code bars are moved, the bar 54 is also moved from the position shown in Fig. 4 to that shown in Fig. 5, together with all those members which are dependent thereon, these members also being moved to the position shown in Fig. 5. As can be seen from this figure, all the pivots 49 are lowered until they are no longer interposed between the extensions 10, H of the levers 43, so that the slides 45 even though upon the teeth 50 cannot Levers I5 and I6 are Actually prevent the projections on the levers 43 from following the cam 41 (Fig. 9). At the same time the hook I2 makes stopping engagement with the tooth 53 so that the central lever cannot rise, even though the corresponding slide is free of it. To sum up, therefore, whatever symbol is formed, during the first rotation of the cams, the code transmitted will be the result of the two first and the two last of the five levers 43 which rise as a result of following the profile of the respective cams 41, whilst the centre lever remains anchored. This code is the symbol code which produces in the printing part of the apparatus the displacement from the position of.

letters to the position symbols. Meanwhile the code corresponding to the registered symbol remains at the dispositions of the slides 40. This displacement of the printing part of the apparatus resulting from the transmission of the symbol code, has the following results:

I. The link descends and causes the frame 15 to oscillate on the axis I4, taking with it the pivots 49, the hook l2 and the frame I8 into the position shown in Fig. 10. The pivots 49 entering anew between the extensions 10, H, the hook I2 is withdrawn so that it no longer retains the teeth 53.

II. The lever 82 (Fig. 12) fixed on the shaft 14 and terminating in a point, causes during its movement on the pivot 14, an oscillation of a cranked lever I33 arranged to rock on a pivot I04. This lever is arranged to make a return movement under the tension spring I05 to its rest position as soon as the point of the lever 82 has moved past the pin Itt by which it controls the lever I83. As a result of its oscillation, lever 13 raises a pointer 83 which is normally held by a spring III! in engagement with a fixed abutment I08. This pointer is provided with a projection shaped as shown in the drawings, and is connected with a pneumatic brake formed by a cylinder 85 in which is mounted a movable piston fitted with a valve H3 which when open permits the rapid movement of the piston towards the right,

" whilst movement in the opposite direction is braked by the vacuum caused in the cylinder as a result of the constricted air entry aperture I I4. This arrangement will be described later. If the pointer 83 is assumed to be displaced to the right as shown in Fig. 13, whilst the printing member is displaced and the levers "IE, 82 are rocked, the lifting of the pointer brings about the movement of a lever I I5 which is rigidly connected with a further pointer I8 and this serves to again free the coupling in such a manner as to permit a further rotation of the camshaft. During this rotation the code signal which had already been registered by the slides, is transmitted.

As has already been stated, the pointer 83 is normally to be found in its position to the left as a result of the tension of the spring I07. In this position the raising of the pointer is Without any effect upon the lever H5 in View of the shape of the latter. However, in the transmitting.

machine the transmission camshaft has, as a result of the depression of a symbol key, already made a rotation. As the result of this rotation a pivot H6 provided on the coupling has operated upon the projection I 09 on the lever 83 so that this lever is displaced from the position in which it is shown in Fig. 12 to that shown in Fig. 13. A moment later, lever 83 is raised to free the coupling as a result of the pneumatic brake not being able to resume its position of rest. Conversely, in the receiving machine the conversion from letters to symbols has taken place as a resuit-of the code received, but the camshaft being stationary, the lever 83 is in contact with the pivot I08and the raising produced as a result of the displacement is without effect upon the coupling so that the latter is not freed to move. This of course is essential in order that the machine which is in condition for reception shall not in its turn transmit a code and upset the operation. It is topbe noted that in the transmitting machine wherein the camshaft makes a rotation for each code transmitted, the pivot I I6 slides during each rotation against the projection I09 so that the lever 83 is always urged towards the right, which in practice, as a result of the delay imposed upon the movement thereof by the brake 85, remains stationary in this position and it responds to the spring I01 only when the transmission is finished. Naturally the air brake may be substituted by any other suitable arrangement depending upon friction or inertia or the like to delay the return of the lever 83 to its position of rest under the action of spring II.

It can now be seen how the automatic transference from symbols to letters is effected, by reference to Fig. 10 wherein the mechanism is shown as arranged for the transmission of symbols. 0n the depression of a key corresponding to a letter, the bar 54 is carried to the right and all the parts which depend for their operation upon this member are moved to the position shown in Fig. 11. However, whatever the code which has been registered by the slides, given that the lateral extensions H0 and H I of the frames 83 and I8 have been displaced by the projections 8I on-the slides, these slides cannot prevent the tooth 50 from rising in following the profile of the cam, but they will themselves be raised so that the code transmitted will be simply the code letters. The slides therefore are moved to the position indicated in dotted lines in Fig. 11.

This code brings about the necessary displacement of the printing member, and as a result of the movement of link 80 the mechanism returns to the position of Fig. 4. Similarly, the lever 82 (Fig. 8) effects a displacement of the pointer I8 and a further rotation of the camshaft, and during-this rotation the code registered at the slides and corresponding to the letter to be transmitted, is-transmitted, whilst the lateral extension III of the frame I8 extends over the projections on the said slides to prevent the latter from rising.

It is to be understood that in automatic responding machines the call is made with the machine set in the position symbols.

Upon th automatic response drum there are arranged the codes to be transmitted which act in succession upon the teeth 86 through the medium of mechanism provided for this purpose. It may happen, however, that the dcspatch of codes symbols or letters will not be produced as a result of the displacement of the bar 55 but by the automatic response drum. It is therefore necessary that the bar 54 shall take up the appropriate position, since it will not be possible to transmit letters when the bar 54 is in the position corresponding to symbols, or vice versa. The bar 54 is provided with two lugs 81 and 88 which carry teeth 89 and 90 which are arranged to rock on pivots SI and 92. Springs 93 and 94 serve respectively to maintain these teeth in engagement with stops 95 and 96. The frame I3 is connected icy alink 91 with lever 98 pivoted upon a spindle 99, and this lever carriesa pin I00 at its extremity in a position where it can operate upon the teeth 89 and 90. The position of the bar 54 in Fig. 14 corresponds to the position letters. When a symbol key is depressed the bar is moved to the left and the pin I00 moves against the tooth 90. During the movement of the machine to the position symbols the pin I08 depresses the tooth 90, expanding the spring 94, and moves into the position shown in Fig. 15, whereupon the tooth 90 returns to its normal position. If, however, the displacement to the position symbols is not brought about through the medium of the bar 54 but under the control of the automatic response drum, the pin I00 slides whilst moving downwards upon an inclined shoulder on the tooth 89, thus bringing about a displacement of the :bar 54 such that the final position thereof will again be that shown in Fig. 15. Similarly, on departing from this figure one arrives at the position indicated.

in Fig. 14 whether the code position letters is produced through the medium of the bar 54, or whether this code, is emitted by the automatic response drum.

The speed of operation of the machine may, however, be increased by keeping the time required for effecting the automatic change from the letters position to the symbols position to a minimum, and this result may be achieved by the use of the arrangement illustrated in Figs. 16 and 17. It has already been seen how the displacement of the carriage or of the plate hearing the characters, for adjustments between the letters and symbols positions, by acting upon the link brings the transmission mechanism back into the condition for transmission of the signal previously registered and for subsequent normal transmission. At the moment of automatic change-over therefore, an interruption of the transmission occurs since inevitably the carrying out of the transmission of the code letters or symbols must be awaited as well as the execution of movement by the machine parts.

This disadvantage may be overcome by substituting for the link 86 an arrangement which is the equivalent thereof but which is controlled by the receiving code bars as soon as these bars have reached the position corresponding to the letters code or to the symbols code.

Since the receiving code bars under the conditions being considered take up the position which corresponds to the code transmitted immediately after the reception of the last impulse, all loss of time is eliminated.

In this arrangement, there are connected to the five code 'bars I20, five cranked levers I2I pivoted at I22 and these are made to rock as a result of the longitudinal displacement of the bars. The levers I2I are all shaped as shown in the drawings with the exception of the central lever which has the shape shown in dotted lines. Upon shaft 14, lever "I6 is no longer provided but it is substituted by two arms I36 and I24 disposed in two different planes and connected respectively through links I23 and I25 to two frames I26 and I21 arranged to rock on an axis I28 and tending to turnin clockwisedirection under the influence of springs I29 and I30.

The frames I26 and I21 are held at rest by a stop I31 projecting from a lever I3I pivoted at one end' at I32 and controlled at the other end by a cam J33 mounted on the shaft I34 which controls the printing mechanism and which is consequently set in motion at the instant that the code bars I have reached their position, and is stopped after a complete oscillation.

It should :be noted that the connections between the links I23 and I and the arms I33 and I24 are pin and elongated slot connections to obtain a delayed action.

The cam I33 is provided with a projection of which the angular development is reduced. A roller I carried at the end of lever I3I rests against this projection and the arrangement is such thatat the moment when the lever I34 is moved, the lever I3I moves away from the frames I23 and I2! which therefore move to a position against lever I 2| r If a code letters has been formed upon the bars I26, the frame I26 becomes free to respond to its spring I29, whilst if a symbol code is formed the frame I21 responds tospring I3il. For any other code combination however, at least one of the levers I2I prevents rotation of these frames. The levers I 2| form in fact movable extensions of the code bars I20. A further arrangement of the parts will enable the code bars themselves to control the rotation of the frames I26 and I2!. In the position shown in Fig. 17 the frame I21 has moved itself during the beginning of the rotation of cam I33 taking with it the link I25 and causing all the parts connected therewith to rotate.

The elongated slot formed in the link I25 permits the frame to resume its position of rest under the action of the cam I33 and the lever I3I without the movement thereof being transmitted to the arm I24. When a letters code has been formed, the frame I26 may turn, to bring about a movement in the opposite direction of the shaft 14, thus moving the mechanism into the position for the transmission of letters.

What I claim is:

1. A printing telegraph machine for producing a code of a plurality of impulses comprising operating keys divided into two groups respectively, letters and marks; combination bars actuated by said keys, a cam shaft carrying cams, means for starting rotation of said cam shaft by the operation of a key and adapted to stop said shaft after one revolution, sliding members, means actuated by said cams for transferring simultaneously at the beginning of the revolution the sode registcred in said bars to said sliding members for releasing said bars for a further registration, a transmission switch, levers actuated in succession by said cams and controlling said transmission switch depending upon the position of said sliding members, a universal permutation bar displaceable lengthwise to two positions, means actuated by the displacement of said permutation bar to prevent said levers controlling said transmission switch tobe controlled by the position of said sliding members during the revolution of said cam shaft, means to bring said levers back under the control of said sliding members after said revolution of said cam shaft, and means to control said latter means through the receiving and printing part of the machine.

2. In a transmitter for code printing telegraph machine comprising operating keys divided into two groups respectively, letters and marks; combination bars having wedges and actuated by said keys, a shaft carrying cams, means for starting rotation of said cam shaft causing it to perform one revolution, sliding members, means actuated by one of said cams for transferring simultaneously with the beginning of the revolution said code registered by said bars 20 Said sliding members for releasing said bars for a further registration, said means comprising a balance beam and levers hinged thereon provided with a bevel and adapted to act on either side of said wedges, and a resilient connection and universal frame actuated by a cam of the cam shaft for bringing together said levers to act on the wedges of said bars.

3. In a code printing telegraph machine comprising operating keys divided into two groups respectively, letters and marks; combination bars actuated by said keys, a shaft carrying cam means, sliding members, means for starting rotation of said shaft by actuating a key, means actuated by one of said cam means for transferring simultaneously with the beginning of the revolution the code registered by said bars to said sliding members releasing said bars for a further registration, a transmission switch, five levers actuated in succession by said cam means and controlling said transmission switch dependent upon the position of said sliding members, the first two and the last two of said levers consisting each of two rotatably connected parts having extensions, and means for rendering the two parts having extensions rigid relatively to the corresponding sliding members, said latter means consisting of a pivot pin adapted to be interposed between said extensions of said parts.

4. In a printing telegraph machine having five levers actuated in succession by cams of a cam shaft and controlling a transmission switch wherein the two first and. the last two of said levers each comprises two rotatably connected parts and a projection, the central lever being provided with a hook-like projection; pivot pins adapted to be inserted between projections of said levers to render the same rigid, two groups of keys in the key-board, a universal bar actuated by said keys and displaceable lengthwise to two positions according to whether is actuated a key of one group or the other, an oscillatable member bearing the pivots and a hook, said member oscillating upon the lengthwise displacement of said universal bar, disengaging the pivots from said projections of the levers and engaging during said oscillation said :central lever by said hook.

5. In a printing telegraph machine having five transmission levers actuated by a cam shaft and controlling a transmission switch whereof the first two levers and the last two levers are divided into two parts and the central one is provided with a hook; an oscillatable member bearing pivot pins adapted to be inserted between the two parts of said first two and said last two levers, respectively, and a hook adapted to engage with said hook of the central lever, said member being adapted to perform a revolution whereby said pivot pins being disengageable from said levers and engageable by said hook of said central lever upon oscillation of said member, a lever carrying said member and oscillatable for returning said pivots to a position between said levers and for disengaging central lever from said hook.

6. In a code printing telegraph machine comprising operating keys divided into two groups respectively, letters and marks; combination bars actuated by said keys, a permutation universal bar actuated by said keys and displaceable to two positions dependent upon which group of keys is actuated, sliding members lengthwisely displaceable between two limit positions, and means on said members for transferring said code registered by said bars, said members being ing vertical movement of said members, the said universal permutation bar controlling oscillating movement of said frame.

9. In a code telegraph printing machine com-.

prising operating keys divided into two groups; combination bars actuatable by said keys, sliding members movable in vertical direction and upon which said code is transferable from said bars, elements connected to the receiving and printing parts of the machine, a second frame oscillatable upon a journal between two limit positions, said frame in one of said positions preventing vertical movement of said sliding members, said elements controlling oscillating movesaid code registered by said combination bars, a 15 ment of said frame.

first frame oscillatable between two limit positions, said frame in one of said positions prevent- GIUSEPPE BECCIO.

Images