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June 14, W38. M. AMANN ET AL 25,120,350 PRINTING TELEGRAPH RECEIVER Filed Feb. 29, 1956 59.7 ' I” ' a Sheets-Sheetl June 14, 1938. M. AMANN ET Al.‘ 2,120,850 PRINTING TELEGRAPH RECEIVER Filed Feb. 29} 1956 s Sheets-Sheet 2 kg \\ W @x @ fiwerzlors MAX A/mv/v ALF/e50 LA/IL HANS H/ITZl/VGEE .J. étorizeys. June 14, 1938., M. AMANN ET AL 2,120,85Q ‘PRINTING TELEGRAPH RECEIVER Filed Feb. 29, 1936 6 Sheets-Sheet 3 I ‘ fm/emors MAX AMA/VA! June '14, 1938» M. AMANN ET AL 2,120,850 ' PRINTING TELEGRAPH RECEIVER Filed Feb. 29, 1936 s Sheets-Sheet 4 l%lml June 14, 1938. M. AMANN ET AL' 2,120,850 PRINTING TELEGRAPH RECEIVER Filed Feb. 29, 1936 6 Sheets-Sheet 5 A MP3“. / 14/%“? m” By June 14, 1938. M. AMANN ET AL 2,120,850 / ‘PRINTING TELEGRAPH RECEIVER Filed Feb. 29, 1936 ®,@22 s Sheets-Sheet 6 a gy, ?n a m 1m - ga 2‘, /I I ® 6uIn! w @ ® #0 9I Q W w a “a.(z, .%a// Wm’. IMI3.H. v Iw hw _%"W 2HJ“a 7.I iy‘I <_ . ?ya.1%rfiav%0/wI~wv /6 a” 5/ 0yMinn. ”W42. n m L m fm wnv ‘W M EL LE5 Attorneys. 2,120,850 Patented June 14, 1938 UNITED STATES PATENT OFFICE 2,120,850 PRINTING TELEGRAPH RECEIVER Max Amann, Alfred Lahl, and Hans Hatzinger, Frankfort-on-the-Main, Germany Application February 29, 1936, Serial No. 66,426 in Germany March 2, 1935 17 Claims. This invention relates to printing telegraph re ceivers having a type wheel and a selecting mech anism which comprises a set of rotary permuta tion or code discs and a set of testing members 5 adapted to cooperate with the discs and which can be set into different positions by means of a single magnet. In this type of receiver, the various testing members are successively set by the magnet under the in?uence of the successive 10 current impulses of a received telegraph signal through the agency of a rotating device. The whole set of testing members is then moved towards the rotating discs which have grooves in their peripheries arranged so that the testing members can only engage in them and thus lock the discs in one particular angular position of the discs for any one setting of the testing mem bers. The type wheel is connected to the code discs and rotates with them. When the discs are 20 at rest, a particular type lies in front of a print~ ing hammer by means of which this type can be printed. 213 The object of the invention is to reduce as far as possible the load borne by the above-mentioned magnet when setting the testing members and to transmit the force to be used for setting these testing members through an auxiliary device so that the sensitivity of the magnet can be increased and the magnet can be made to respond to weak current impulses. In accordance with the inven tion the setting of the testing members is effected as a consequence of the position taken up by a rotary device controlled by the magnet and as a result of the force maintaining this device in ro tation. The rotary device is positively set dur ing the rotation so as to determine a particular setting of the testing members and is held in the set position merely by bringing the armature of the magnet into one of its two extreme posi 40 tions at particular intervals of time. The test ing members are thus set only indirectly in de pendence upon the position of the armature. The magnet itself thus does not exert the force for setting the rotary device and for setting the testing members. The position of the magnet armature is moreover positively determined by the rotary device and the setting of the testing mem bers is effected positively according to the posi tion assumed by the rotary device which is itself dependent upon the position of the armature, by the ‘force maintaining the device in rotation. In order that the invention may be thoroughly understood and be more readily carried into effect, an example of construction in accordance (Cl. 178-34) therewith will now be described with reference to the accompanying drawings, in which:— Figure 1 is a plan view of a telegraph receiver in accordance with the invention. Figure 2 is a sectional elevation of the re- 5 ceiver. Figure 3 is a cross-section taken on the line III—III in Figure 1. Figures 4-6 illustrate details of the mechanism 1O shown in Figure 3. Figure 7 is a cross-section taken on the line VII—VII in Figure 1. Figure 8 is a diagrammatic representation of the selecting mechanism. Figures 9 and 10 show the selecting mechanism 15 in two testing positions. Figure 11 is a perspective View of the testing levers of the selecting mechanism. Figure 12 shows diagrammatically the positions taken up by various parts of the selecting mech 20 anism on selection of the letter A. Figure 13 is a cross-section taken on the line XIII-~XIII in Figure 1. Figure 14 is a sectional plan View of part of 25 the arrangement shown in Figure 2. Figures 15 and 1'7 are plan views showing in two different working positions the devce provided for bringing the printing mechanism into opera tion. Figures 16 and 18 are respectively a side eleva 30 tion and a front elevation of part of the device shown in Figures 15 and 17, and Figure 19 is a sectional elevation to a larger scale of a detail illustrated in Figures 15 and 17. The illustrated receiver has a single receiving 35 magnet and the whole of the members which are necessary for printing a type are mechanically controlled during and after reception of the ap propriate code signal. The type is carried by a type Wheel and the 40 printing takes place on a paper strip when the type wheel is at rest. The type wheel can assume 64 different positions and one of 32 different po sitions can be selected on reception of a 5-unit code signal. Shift signals cause the type wheel 45 to be stepped backwards or forwards through l/64th part of a revolution. In this way, ?gures and signs can be printed in addition to letters of the alphabet. In some positions, correspond ing to switching steps and the like, printing is 50 prevented. The setting of the type wheel is controlled by 'means of a selecting mechanism comprising two sets A and B each of 5 testing levers each of which cooperates with a pair of code discs. The testing 55 2 2,120,850 levers can be displaced individually relatively to normal position illustrated in Fig. 2 by the pawl the pair of code discs associated with them. This displacement is effected by means of a distributor which is rotated as synchronously as pos sible with the transmitting distributor or the re ceived signals. The various testing levers are displaced successively and the displacement is I33, seen in Figs. 3 and 4. The sleeve I28 has oblique grooves I34 (Fig. 14) cut in it at one of its ends in which engage dogs or lugs I35 projecting radially inwards from a ring I39, ?xed to a sleeve I31. This sleeve I31 is capable of axial displacement and is guided controlled indirectly by the receiving magnet in during such displacement by guide slots I38 in accordance‘with the received code signal. When the sleeve H29. A drum I53 to whichv is ?xed the testing levers have been set in their displaced the distributor arm I52 is mounted on the sleeve 10 positions, they are brought, as a set, into contact with the pair of code discs associated with them, I29. This drum can be reciprocated easily along the sleeve I29 without angular displacements and, for this purpose is provided with pins I54 (Fig. so that they can engage, as a set, in the grooves formed in these discs when the latter are subse 15 quently rotated. This engagement of the testing levers in the grooves in the code discs is only possible in one of 32 positions of the code discs, this position being determined by the setting of the testing levers. The type wheel rotates with 20 the code discs and thus takes up the position de— 2) ending in rollers which lie in the grooves I33 formed in the sleeve I29. 15 The sleeve I29 terminates at its forward end in a ?ange I59 to which are ?xed a cam disc I68 and a wheel I32. Rotation of the sleeves I28 and I29 with the stopped by the testing levers when thelatter shaft II8 which always takes place to the extent 20 of half a revolution is effected by the pawl’ I 33, (Figs. 3 and 4). The pawl I33 is pivotally mounted at I13 and come into the grooves in the code discs. its curved end normally projects into one of two termined by the selecting mechanism and in which the code discs and the type wheel are The printing or other operation then takes place with the type wheel at rest. The selection of the position of the type wheel corresponding to the setting of one set of testing levers can take place While the other set of testing levers is being set by a subsequent signal. The printing of the selected type (or the shift or other step) is effected directly by the print ing mechanism after the code discs and the type wheel have been brought to rest. These steps are effected by a motor. The receiver (Figure 1) is driven by a. motor I32 through a worm and a worm wheel I84, I85. This single motor is also used to drive and con trol the distributor arm I52 (and the parts con nected therewith), to rotate the code discs I93— I98 and the hub I25 which carries the type wheel I25 and to control the parts connected with the printing or with the prevention of printing. The worm N14 is connected to the shaft I81 of the receiver through a flexible coupling I68. The shaft I81 carries two toothed wheels H2, H3. The wheel II2 meshes with a wheel II4 of twice its own diameter and forming part of the start stop mechanism. The wheel II3 meshes with a smaller wheel H5 which drives the selecting mechanism. The wheel H4 is ?xed to the shaft, ! i8 of the receiver by means of a hub I I6 forming one part of a dog clutch (Fig. 2) and a grub screw H1. The wheel H3 (Fig. 2) is mounted to rotate on the type wheel shaft I22 which is coaxial with the shaft H8. The type wheel I25 and the cam discs I21 associated with it are mounted on. the carrier member I26 keyed to the front end of the shaft I22. At its front end, the shaft I81 has ?xed to it one part 262 of a dog clutch (Figures 15 and 17) by means of which the parts which come into play for eifecting printing are coupled. , Two sleeves E28 and I29 (Figs. 2 and 14) are freely mounted on the continuously rotating shaft H8 of‘ the receiver. The sleeve I28 has forked lugs 592 (Fig. 2) projecting from it in which engage dogs I9I on the part I38 of the 710 clutch i363, H6, which part is free to slide on the sleeve I28. A helical spring E32 abuts against the lugs I92 and the part I38 and is housed with in a drum I3I rigidly ?xed to the part I38. This spring I32 tends to cause the clutch I38, II6 to engage but is prevented from so doing in the diametrically opposite openings I'II in the drum 25 i3I and holds the drum in the stop position. In this position, an oblique surface I 88 bounding the opening I‘II bears against an oblique surface at the upper left hand end of the pawl I33 so that the clutch I18, I38 (Fig. 2) is held disengaged. 30 The drum I3I is prevented from rotating back wards by the check pawl I11 (Figs. 3 and 5) piv otecl at H8 and which normally abuts against the upper edge of the opening I1I opposite to that in which the pawl I33 is engaged. 35 A spring I13 urges the pawl I11 into engage ment and tends to hold the pawl I33 out of en gagement with the openings I'II in the drum I3I. In the normal position, the spring I16 is pre vented from swinging the pawl I33 clockwise 40 because the lower end of the arm I15 attached to the pawl abuts against the cranked end of a bar I85 forming part of a pivotable member I83, (Fig. 6). A third arm !14 (Fig. 3) moving with the pawl 45 I33 is disposed in the plane of two diametrically opposite abutments I19 formed on the edge of the drum I3I. The arm I14 can only come into contact with the abutments I19 when the pawl I33 is pivoted out of the normal position. This 50 only happens shortly before the completion of the half revolution of the drum I3I. The bar I85 can be pivoted about the pivot I831» against the action of a weak spring I84. The arm I82 of the pivoted lever I83 lies opposite the end 55 I3! of the armature I48 of the magnet I58 (Figs. 3, 6 and 7) . When the armature I48 drops, its end I8I abuts against the arm I82, pivots the lever I33 against the action of a spring I84 and releases the arm 60 I15. The pawl I33 is now effectively acted on by the strong spring I16 and, as a result, the arm I15 rides over the sloping face. I86 (Fig. 6) of the cranked part of the bar I 85. The force thus exerted on the arm I85 assists in the pivoting of 65 the lever I83 and the pawl I33 is thus elfectively un-latched by a small movement of the armature I48. In the normal position, the magnet coils are supplied with current and hold the armature I48 70 in the position illustrated in Fig. 7 against the action of the spring I81. The disengagement of the pawl I 33 from the opening I1I in the drum I 3| when the arma ture I48 drops allows the compression spring 75 33 2,120,850 I 32, (Fig. 2) to bring the teeth on the clutch mem ber I39 into engagement with the teeth on the rotating clutch member IIB. From this instant onwards, the shaft I I8 is coupled by the dogs I9I to the sleeves I28 and I29 and the whole of the parts guided by the sleeves, including the dis tributor arm I52, are rotated together. Shortly before the drum I3I has completed half a revolution, one of the abutments I'I'9 (Fig. 10 3) abuts against the. arm I'M and turns the pawl I33 against the action of the spring I75. At this instant, the opening III in which the pawl Ill was previously engaged is opposite the pawl I33. The sloping surface I88 bounding this opening 15 now abuts against the head of the pawl I33 and the drum I3I is moved in the direction of the ing mechanism. The levers I5'I (Fig. 13) by means of which the testing levers I58 are displaced are pivotally mounted in bearings 235 on the rear side of the frame I2I. The levers I51 are curved at their free ends and end in lugs 23? disposed in a circu lar path wiped over by the lug I55 of the dis tributor arm I52 (Figs. 1, 2 and 'l). The lugs 93‘? 10 have sloping surfaces and when the lug I55 passes over them, the free ends of their levers I5‘? are depressed. arrow shown in Figure 4. This causes the clutch The distributor arm I52 is fixed to the drum I53 (Fig. 2) which is free to move axially rela 15 tively to the sleeve I29 but is constrained to re tate with the latter by the pins I55. The arm I39, IIB to be disengaged, the drum I3I to be stopped and the arrangement to be brought to rest after exactly half a revolution. The selecting mechanism comprises two sets sion spring I55 which abuts against the flange I59 of the sleeve I29. The drum I53 in the right hand position illustratedv in Figure. 2 reaches al A and B of testing levers I58 and the code discs I93-I.96. 25 of the two sets A and B have projections 259 and 298’ which control an escapement for the print~ (Figs. 8-12). The testing levers I58 are not shown in Fig. 2. Each testing lever I58 is mounted on a pin or shaft I98 (Fig. 11). The latter are. mounted so as to be movable axially in the brackets IZI and the side plates 25L (Figs. 1 and 11). The side plate 29I for each set of levers is held at the correct distance from the bracket I2I by a dis tance piece 292. The pins or shafts I98 and therefore the testing levers on them, can be set into a forward or a backward position by means of control levers I51 (Figs. 1 and 13) which pro ject through slots in the flat ends I99 of the shafts I98. They are maintained in these posi tions by springs 299 (Fig. 11). The testing levers I58 can be displaced parallel to the axis of the code discs, the levers I58I--V 40 of the set A relatively to the code discs I93, I94 and the levers I53I'—-V' of the set B relatively to the discs I95, I95 This is diagrammatically il lustrated in Figure 8. The distance apart of the code discs in a pair is less than the sum of the thicknesses of two testing levers I58, (Fig. 11). The tails 295 of the. testing levers of each set abut against each other and are connected together by a spring 297 or 291’. The displacement of the testing levers parallel to the axis of‘ the code discs does not bring their tails 294 out of contact with each other. This is clear from Figure 11, where the testing lever I58III is shown in the extreme right hand position and the testing lever I58IV in the extreme left hand position. This mutual support of the testing‘ levers I58 prevents independent movement of the levers about their shafts I93. The topmost lever of the set B and the lower most testing lever of the set A each has a rear— ward extension 295 and the topmost lever of the set A and the lowermost lever of the set B a simi lar extension 295' (Figs. 9 and 10). A spring 206 is anchored at one end to the projection 395 of the lever I58V and at the other to a control lever I61; a spring 255’ is similarly connected to the lever I53V’ and the control lever I58. The ends 405 and 405’ of the control levers I67 and I-58 abut against the projections 295' so that when one of these levers is swung about its pivot IE?’ or IE8’, the set of testing levers I59 associated with it is swung as a whole about their pivotal axes into or out of engagement as the case may be with the pair of code discs associated with that set. ‘ The lowermost testing levers I59V and I581’ I53 and the drum I53 are acted on by a compresm most to the base of the drum MI. The drum I4! is ?xed on the supporting frame I45. 10 slowly rising and suddenly falling cams I49 (Fig. '7) are distributed over its circumfer ence. During half a revolution of the sleeve I29, these cams, by coming into contact with the two rearwardly projecting lugs I5! (Fig. 2) on the distributor arm I52 determine ?ve forward and backward movements of the latter. The two lug‘s I5I ride at the same time, over oppositely disposed cams I49, the latter being arranged symmetrically on the drum MI. The cranked end I41 of the armature MS of the magnet I50 projects through an opening M5 .35 formed'in the lower part of the drum I/II (Figs. 2 and 7). It prevents the drum I53 from being moved by the spring I55, as, while the lugs I5I are sliding over the cams I49, it slips between the edge of the drum I53 and the base of the drum 40 I4! and remains here when the lugs I5I have passed ‘clear of the cams I49. The lever I4‘! is yieldingly connected to the armature I48 by means of a spring I99 (Fig. 7). This armature is periodically brought up to the pole I65 by the action of the cam disc I59 on the member I 54 ?xed to the armature. The mag net I59 therefore only has to exert a magnetic force to hold the armature I43 attracted to the pole when the part IE4 is free of the cams I53. This release of the part I54 by the cam I53 always takes place at about the middle third of each signal impulse, at which instant, the signal cur rent has reached its peak value. If this release takes place when no current is flowing, the arma ture I48 is turned anticlockwise by the spring I81 and the lever I41 comes out of contact with the drum I53. The cam disc I69 is ?xed to the sleeve I39 which also moves with the distributor arm I52 60 and the drum I53. The arrangement is so de vised that the distributor arm I52 and the drum I53 are engaged by a cam I48 before the part I64 is engaged by a cam I53 and are released by the cam I49 at the earliest, at the same in~ stant as the armature projection I54 is released by the cam I63. In this way, the engagement of the armature lever I47 between the drum I53 and the stationary drum MI is ensured. In order to synchronize the signal impulses and the rota tion of the cam disc I50, the ?ve successive cams I63 are advantageously made of increasing length. The distributor arm I52 and the drum I53 can only be moved axially by the spring I55 when 75 2,120,850 the lugs I5I lie between two of the cams I49 on the drum .I4I. When the magnet I50'is ener gized, such axial movement is prevented by the lever I41 of the armature I40. The lugs 231 on the levers I51 are also disposed in the intervals in each set has a corresponding value. The ends 203 of all'thetesting levers of both sets are exactly the same; The ?ange 209 can, if desired, be provided with between the cams I49. preventing recoil of the code discs when they are stopped by the testing levers. Such a pawl ' If, then, the drum I53 is prevented from mov ing by the armature lever I41, the lug I56 on the arm I752 abuts against the lug 231 formed 10 on a lever““l51 so that the associated testing lever I58 is transferred into its other extreme position. On the other hand, when the lug I5I of the arm I52 is allowed by the armature lever I41 to engage in the space between two of the cams I49, the lug could be brought into action by the movement of the control levers I61 and I68. The toothed wheel II5 (Figs. 1 and 2) is freely 10 mounted on the shaft I22. It is frictionally connected to it both through the clutch plate 2I0 (Figure 2) and through the outermost code control levers I51. The latter therefore remain in the extreme forward position. The extreme forward position of the levers I51 and the testing levers I58 is determined by a disc I96. The pressure exerted on the clutch plate 2I0 can be varied by displacement of a ring 2I2 and a resilient, split, dished disc 2H. The position of the ring 212 can be adjusted by means of a nut 2I3 and any setting can be main tained by means of a lock-nut 2I4. cam 238 (Figs. 1 and 13) before these levers are set by the lug I56 of .the arm I52. This cam 238 is arranged on the disc I62 at a given angle As already stated, the drum I26 carrying the 120 type wheel I25 is ?xed to the type Wheel shaft I22 by means of a key 220. The type wheel a (Fig. 13) in advance of the lug I56 on the arm carries groups of cam discs I21 or a grooved I56 is out of the plane of the lugs 231 on the I 52. In this way, shortly before the lug I56 wipes N) MI over the lugs 231, the testing levers I58 are brought successively into the forward position by engagement of the cam 238 with the rear side of the lugs 231, in which position they can be acted upon by the following lug I 56. 30 The levers I61 and I68 (Figs. 9 and 10) which rest on the uppermost testing levers I581 and I581’ are controlled by a cam groove I6I in the wheel I62 and a follower pin I66 (Fig. 9). They are pivoted simultaneously, one inwards the other ca in outwards during the last 7th part of each half revolution of the wheel I62. When, at the end of the half revolution, the lever I61 (Fig. 9) has been brought into action the member 405 abuts against the free end 205 of the uppermost testing lever I58I of the set A. The blow is transmitted through the tails 204 to the lever I58V so that all the levers of the set A are swung clockwise about their bearing pins I98. Their ends 203 are thus removed from the grooves in the code discs I93, I94. At the same time, the lever I68 is swung so that its member 405' is removed away from the projection 205' of the lowermost lever I581’ of the set B. The spring 206' pulls on the lever I58V' and all the levers of the set B are swung counterclock wise. The ends 203 of these testing leversnow lie on a pair of code discs I95, I96 but do not immediately engage in the grooves therein. (It cannot be assumed that out of the many cases that can occur, that case will be present in which the whole of the ?ve testing levers will be oppo W a tooth in which can engage a check pawl for site corresponding grooves in the discs and, there fore, be able to engage immediately therein.) Moreover, the testing levers of the set B remain under the in?uence of the spring 206’ until all the testing levers can engage simultaneously and stop the code discs. The code discs I93-—-I96 are rigidly connected to the ?ange 209 (Fig. 2) on the shaft I22. The drum for controlling auxiliary devices. The selecting mechanism operates as follows:— > The code signal received in connection with the letter A consists ?rstly of a no current impulse (start element), then two current impulses, then three no current impulses and ?nally a 7th cur rent impulse (stop element). On reception of the start impulse, the sleeve I29 is coupled to the shaft II8 for half a revo lution. During this rotation the distributor arm I52 is displaced axially ?ve times against the action of the spring I55 by means of the lugs I5I which slide over the cams I49, once‘ at the begin ning of each of the ?ve received current impulses. At the same time, a cam I63 on the disc I69 acts on the part I64 of the armature and brings the armature I48 up to the pole I65. At about the 40 ?rst third of each current impulse, (with disc I60 also of the stop impulse) the lugs I5I and IE4 reach the highest point of the cams. The arm I52 is pressed back together with the drum I53 by the spring I55 as soon as the end of , , a cam I49 is reached. If the cranked end of the lever I41 is at this instant lifted and the arma ture attracted, the drum I53 cannot move back wards and the arm I52 remains in the displaced position in which its lug I56 acts on the lug 231 of the appropriate testing lever. In the case under consideration, after the start impulse, the armature which has been brought near the pole remains attracted for two current impulses and thus prevents the return move ment of the arm I52. The lug I56 on the dis tributor arm thus acts on the lugs 231 of the control levers I51I and I51II (Fig. 13), and thus displaces the testing levers I581 and II. The following three no-current impulses allow the 60 armature which, on further movement towards the pole by means of the cam I63, meets no mag The smallest cam in the code discs extends net holding force, to release and, as the lever I41 is also released, the arm I 52 and the drum I 53 to assume the right hand position illustrated in 65 Figure 2. The three levers I51III, IV and V are thus not effected by the lug I56 and with the test ing levers I58III, IV and V, remain unset. The resetting cam 238 is in advance of the lug I56 of the distributor arm I52 and brings into the forward position the control lever I51 of the set A which is to be acted upon. After reception of the signal, the testing levers over all; part of its circumference. The distance 37:5 between the ends 203 of the testing levers I58 I58I—V of the set A are displaced as is shown in Figure 8 for the set B. 75 > pair of code discs I93, I94 belonging to the set A is identical with the pair of belonging to the set B, but the displaced through 180° relatively The discs in each pair are also discs I95, I96 two pairs are to each other. similar except 7-0 that one is provided withcams in the form of humps and the other with cams in the form of grooves.v ' ‘ 5 2,120,850 However, during the reception of the stop cur rent impulse, the displaced levers of the set A are released by the lever I61 through the agency of the cam track I 6| in the wheel I62. The test“ ing levers are thus pivoted by the spring 2% act ing on the end 205 of the lever I58V so thatthe ends 203 of these levers lie on the code discs I93 and I94 of the set A. The testing levers of the set E which up to now have been in engagement with their code discs are swung out of engage ment as a set by the lever I68 which is caused to strike the tail 225’ of the lever I531’ (Fig. 10). The levers I58I’—V’, however, are still not re— turned into the forward normal position. In the meantime, on reception of the stop 15 impulse the maintenance of the sleeve I29 is pre pared by the arm I52 and can be effected without in?uencing the succeeding steps. As soon as the ends 203 of the testing levers 20 in set B are removed from their operative posi tion in the grooves of the discs I95 and IE6, all restraint is removed from the code discs and these are driven by the wheel H5 through the clutch 2M, H5. The 'shaft I22 and all the code discs 25 and all the other parts rotate together at a rela tively high speed. The time required for a complete revolution of the shaft I22 corresponds approximately to the duration of ?ve signal impulses on the assump 30 tion that two sets of testing levers are used. During the rotation, all the ends 203 of the engaged set A of testing levers will slide on the code discs I93 and I94. These testing levers can engage in the grooves in these discs when, as il lustrated in Figure 12 for the set B, the one ap propriate position out of the 32 possible engaging positions is reached. In any other position, there may be from one to four of the levers I58 above corresponding grooves, but no engagement there— 40 in is possible because the abutment of the testingv levers one on another only allows the levers to move all together, that is to say, as a set. The engagement of the levers of the set A is accelerated by the- action of the spring 286. When the selecting position is reached, the shaft is suddenly stopped by the ends 203 of the testing levers I58I—V. The impact caused on stoppage of the type wheel shaft I22 is received directly by the bearing pins‘ I88 of the testing 50 levers. The relative positions assumed by the code discs and testing levers for the selection of the letter A (the case under consideration) is illus trated in Figure 12. Here, however, the selec“ tion was effected by the lever of the set 13 and the discs I95 and I96 of the set B which are dis placed by 180° relatively to the code discs of the set A. The letter A on the type wheel I 25 is then in the printing position. The two sets A and B 60 are used alternately for successive incoming signals. During one half revolution of the dis tributor arm I52, the testing levers of the set A are set and are released for cooperation with the discs I955, I92 and during the next half revolu '-> tion, the levers of the set B are set and released for cooperation with the discs I95, I96. The impulses transmitted to the magnet I59 regards the impulses of any one signal) the re ceiver has to be provided with a device for regu lating the phase position of the selecting mecha nism relatively to the start-stop mechanism. At the ?rst release of the armature M8 after the start impulse, the start-stop mechanism cou~ ples the shaft M8 to the sleeve I28 through the clutch wheels H5 and I32 for half a revolution. This sleeve I28 (Fig. 14) is coupled to the sleeve I29 of the selector gear by the dogs I35 on the flange I 36 which engage in the oblique grooves I34 at the forward end of the sleeve I28. The flange I36 is ?xed to the sliding sleeve IZi'I which is guided the longitudinal slot I33 in the sleeve I29. The sliding sleeve I3‘! is formed with a 15 circumferential groove in which half rings 29] are housed. The ring 391’ is held by means of the nut I29 on the tubular screw threaded extension I40 of the ?xed drum MI. ‘The nut I39 has a milled head I42 with which engages resiliently a blade M3 mounted on the frame Ill-5 (Fig. 2). The ring I35 is displaced by rotation of the nut I39 which can be effected when the blade M3 is lifted. This rotation brings the dogs I35 against the walls of the oblique slot I34 which have a de?nite position in the normal position of the start-stop mechanism and the grooves I38 in the sleeve I 29 are caused to take up a new position relatively to the start-stop mechanism. The distributor arm I52 and the cam disc I68 30 are thus rotated relatively to the sleeve I28 of the start-stop mechanism. The setting nut I35 can be provided with mark ings to determine the phase position of the se lecting mechanism relative to the start-stop 35 mechanism. The arm I52 and its lugs I5! and E55 slide over the rising parts of the cams I49 on the ?xed drum Ill! and come up against the lugs 23‘! of the levers I5‘! controlling the testing levers 40 I58 at particular instants of time during the re ceived signal impulses, according to the relative phase positions assumed by the selecting mecha nism and the start-stop mechanism. Also, by means of the cams I63 on the disc I62 (Fig. '7) the 45 armature its is pressed towards the pole I25 at the appropriate most favourable instant of time. In this way, the armature, the position of which‘ determines the position of the drum I53 and the arm I52, is controlled with certainty by the mag 50 net even with strongly distorted impulses. The most favourable phase position, which may vary quickly particularly with open line telegraph op eration can be set and corrected during opera tion. 55 A printing device translates the position given to the type wheel shaft I22 by the selecting mech anism. If the shaft is in a position associated with letters or signals, printing will be effected; if in a position associated with switching steps, printing will be prevented. This printing mechanism is controlled by the cam discs II--V on the carrier 2% (Fig. 15) which is mounted on the shaft IEB'I. The lever devices cooperating with these cams control further le 65 vers (not illustrated) some of which cooperate with the cam discs I2'l on the type drum IZE and others of which effect the release and return of the printing hammer 221. The sleeve 2M by means of which the part 2262, 70 (Figs. 15 and 16) of the clutch 255, 262 is ?xed selecting mechanism, to use only those parts of ' the various impulses of the signal in which the on the shaft IIl'I carries the sliding half 269 of the clutch. The part 260 is pressed towards the most favourable current values occur. As the point at which the most favourable operating part 262 by a helical spring 255 which abuts 75 against the carrer 264. The carrer 264 is freely conditions occur varies, (although constant as from the transmitter are more or less distorted according to the conditions in the line. It is usual, for the purpose of controlling the 6 2,120,850 mounted on the end of the shaft I01 and rotates with the part 269. tributed over their circumference. The cam discs II—V can be carried round through one-third of a revolution of the shaft 191 by means of the clutch 269, 262. The clutch 269, 262 is controlled by a pawl 2M pivoted at 255. This pawl has two claws 25'! and 258 (Fig. 16) which cooperate with the diamond shaped projections 259 on the part 260 of the 10 clutch. have threecorresponding humps'uniformly dis~ A spring 242, (Fig. 18) tends to keep the pawl 241 out of engagement with the pro jections 259. The pawl MI is pivoted by a rod 249 hinged to it and pressed by the spring 242 against the front 15 of two arms 249 and 250 pivotally mounted on a common pin 248 which is arranged in line with the rod' 240. The arms 249 and 259 are pressed together by a spring 25I and can be swung about their hinge 20' 248 by means of .a pin 252 on a T-shaped member 254 also pivotally mounted on the pin 248. The branches of the T-shaped member are engaged by control levers 24B and 221. The control levers 246 and 24'! can be acted on by the arms 298 The clutch member 269 is permanently under the pressure of the helical spring 266 so that when released by the pawl 24!, it is moved to-' wards the wheel 262' for the purpose of clutch ing the cam discs II-V to the shaft I01. When the pawl 24! is disengaged, the clutch member 269 is free for axial and angular move ment (Fig. 17). Shortly before the end of '1/3 of a revolution, the sloping face of the next pro jection 259 abuts against a corresponding‘slop ing face on the arm 25'! of the pawl 24! which has been again brought into action in the mean~ time. Consequently, the clutch member 260 is 15 displaced against the action of the spring 266 nd, as the projection 259 abuts against the head of the arm 258 of the pawl 24l is held after ex— actly 1/3 of a revolution. The cam disc II, chortly after the'b-eginning of the rotation of the carrier 20: 261i presses on the ?nger 268 of thepawl MI and, on further rotation, swings it against the action of the spring 262 into'the locking position. In this way, the rod 240 is again attracted to the and 208' (Figs. 9, 10 and 13) which are adjust~ ably ?xed to the testing levers i58V and I581’. The arrangement controlled by the rods 246 the levers 2&9 and 250 of the escapement mecha nism. The pawl 2M is thus again held in its and 24‘! operates as follows:— locked position. When the testing levers of the set B (Figs. 9, left and then abuts on the front face of one of the lever I581’ is pivoted clockwise, the arm 208’ During the rotation of the cam discs II—V for one-third of a revolution, various levers are actu 30' ated by these cam discs so as to in?uence the moves away from the left hand end of the rod printing hammer for striking the type to which 24? (Figs. 15, 1'7 and 18). At the same time, the testing lever I58V of the set A is placed on‘ its code disc and remains there until the ends ‘293 of the testing levers of this set A ?nd it possible to engage in the discs in the so called testing po sition. As long as the lever I58V is not fully en the type wheel has been set or to prevent print ing and effect desired switching operations. The 10 and 18) are removed from the code discs and gaged, the arm 298 has no effective in?uence on the right hand end of the rod 245. When, how ever, the testing position is reached, (Fig. 18) the rod 246 is pressed towards the right by the arm 298 acting under the in?uence of the pull of the spring 206 which also accelerates the engage ment in the code discs of the set of testing levers A. The T-shaped lever 248 carrying the pin 252 _is thereby pivoted clockwise as is therefore the lever 249 against the front face of which the rod 249 has, up till now, been pressed. The lever 250‘ 5'; is also caused to turn by the spring 25!. The rod 299 moves towards the right under the pull of the spring 242 and arrives in a position between the levers 249 and 250 and thus prevents the full pivotal movement of the arm 250 which remains in an intermediate position, (Figure 17) and causes the spring 25l to be extended. It is only when, later on, the rod 249 is tempo rarily pressed towards the left that the arm 250 will move from its intermediate position under the in?uence of the tensioned spring 252 and abut against the arm 249 which has been swung into its extreme position (Fig. 19). The rod 240 now abuts against the front of the pivoted arm 259. It is only when the set of testing levers A . has been made inoperative and the levers of the set B are placed on the code discs and have en gaged therein and the pivoted levers 249, 250 are swung counter-clockwise, that the rod 249 and with it the pawl 24l are released. There are three diamond shaped projections 259 spaced at equal intervals on the circumfer ence of the clutch member 260 (Fig. 16). By means of these projections, the cam discs II-V are released for the duration of one-third of a 75 revolution of the shaft I09. The cam discs II—V cams of the cam discs II—V also serve for the displacement of the paper to be printed and of the ink ribbon. This is not illustrated in detail 35 as it is of no importance as regards the inven tion. We claim: 1. Type printing apparatus comprising a se 40 lecting device for determining a type according to received code current impulses of the Baudot type, said selecting device comprising a type wheel, a set of selecting discs connected to said 45 type wheel, means for rotating said selecting discs and said type wheel, a set of testing members adapted to control said selecting discs, a setting device for setting said testing members relatively to said selecting discs, means for rotating said setting device, means for setting said setting de vice during its rotation, a magnet adapted to- be in?uenced by said code current impulses and pro vided with an armature adapted to in?uence the setting of said setting device, and means acted upon by said setting device during its rotation whereby to set said testing members successively under the in?uence of said means for rotating said setting device and in dependence upon said armature. 2. Apparatus as claimed in claim 1 in which said means for setting said setting device dur* ing its rotation comprise a stationary disc pro vided with cams on its-circumference adapted to displace said setting device axially during its 65 rotation. 3. Apparatus as claimed in claim 1, in which said means for setting said setting device during its rotation comprise a ?xed disc provided with a ring of cams arranged in pairs diametrically opposite each other and adapted to act simulta neously on said setting device to displace it ax~ ially. 4. Type printing apparatus comprising a se lecting device for determining a type in accord 2,120,850 ance with received code current impulses of the Baudot type, said selecting device comprising a type wheel, a set of selecting discs connected to said type wheel, means for rotating said select ing discs and said type wheel, a set of testing members adapted to control said. selecting discs, a rotary se’t'ng device for setting said testing nembers relatively to said selecting discs, a mag net adapted to be influenced by said code cur— 10 rent impuises and having an armature adapted to in?uence said setting device, a cam disc clutched to said setting device, means acted upon by successively to displace by said the cams armature of said intermittently cam disc dur“ 15 ing rotation of said disc towards the pole of said. magnet, a stationary cam disc, means acted upon 7 selecting discs, a set of testing members on said last mentioned, shaft adapted to control said se lecting discs and arranged for axial and rotary displacement on said shaft, projections on said testing members whereby each of them is sup ported by the testing member below it in each of its axial positions, a setting device for axially displacing said testing members, means for ro tating said testing members about their axes, a magnet adapted to be influenced by said code 10 current impulses and having a projection adapt ed to in?uence said setting device. 7. Apparatus as claimed in claim 6, in which said selecting discs are provided on their circum ference with grooves and humps and said testing 15 members are provided with noses adapted on ro release said setting device for axial displacement under the action of said spring, at the earliest, tation of said testing members to be brought to lie on the circumference of said selecting discs and, on rotation of said discs to engage in said grooves in said selecting discs whereby to stop 20 directly rotation of said selecting discs‘. 8. Apparatus as claimed in claim 6, compris ing also a spring acting on said testing members and tending to rotate them as a whole about their axes,‘ said means for rotating said test 25 ing members being constructed as a rotary disc at the same time as that at which the cams of said movable cam disc release said armature of trolled by said controlling cam. acting on said successively by the cams of said stationary disc whereby to intermittently displace said setting device axially during its rotation, a spring acting on said setting device and opposing said axial displacement of said setting’ device; said set ting device, the cams of said movable cam disc the cams of said stationary cam disc being so arranged that the cams of the stationary cam disc said magnet. ’ 5. Type printing apparatus comprising a se ecting device for determining a type in accord ance with received code current impulses of the Baudot type, said selecting device comprising a type wheel, a shaft for said type Wheel, two selecting discs arranged one beside the other on shaft and connected to said type wheel, means for rotating said selecting discs and said type wheel, a set of testing members adapted to control said selecting discs and arranged for displacement parallel to the shaft of said select 40 ing discs, a setting device for setting said test members relatively to said selecting discs, a shaft for said setting device, said setting device being arranged for axial displacement on its shaft, means for rotating said setting device, 45 stationary means for periodical axial displace ment of said setting device during its rotation, a spring acting on said setting device in opposi tion to said means for axially displacing it, a magnet adapted to be in?uenced by said code c1v nt impulses and provided with anarmature adapted to hold said setting device in its axial ly displaced position against the action of said spring, means acted upon by said setting device in its axially displaced position whereby to set said testing members successively out of their normal position under the in?uence of said means provided for its rotation, a rotary re setting device for said testing members set in rotation by said means for rotating said setting (30 device and disposed in advance of said setting device in the direction of rotation of the latter, means acted upon by said resetting device during its rotation whereby to return said test ing members successively into their normal po sition. I 6. Type printing apparatus comprising a se lecting device for determining a type in ac cordance with received code current impulses of the Baudot type, said selecting device compris a type wheel, a shaft for said type wheel, two selecting discs arranged one behind the. other on said shaft and connected to said type wheel, means for rotating said selecting discs and said 75 type wheel, a shaft parallel to the shaft of the comprising a controlling cam and a lever con“ testing members for holding said testing mem bers against rotation by said spring and for al lowing such rotation. '9. Type printing apparatus comprising a se 30 lecting device for determining a type in accord ance with received code current impulses of the Baudot type, said selecting device comprising a 35 selecting wheel, two sets of type discs connected to said selecting wheel, each of said two sets of type discs being of similar construction and be ing displaced relatively to each other through 180°, means for rotating said sets of selecting 40 discs and said type wheel, two sets of testing members, one set of selecting discs being asso ciated with each of said sets of testing mem bers, means controlled by each of said sets of testing members for controlling the associated 45 set of selecting members, the testing members of each set having axes of rotation parallel to the axis of rotation of said selecting discs, the test ing members of each set being provided with projections for mutual support of the testing 50 members. of a set, a spring for each set of test» ing members striving to rotate all the testing members of one, set as a whole about their axes, said testing members being provided with noses adapted, on said testing members being rotated about their axes, to be brought to lie on. the cir cumference of said selecting discs, a control lever for each of said sets of testing members for pre venting and for allowing movement of each set of testing members under the influence of said 60 spring, a rotary disc provided with control cam for controlling said levers in such a Way that at any time there is only one set of test ing members which is rotated under the in?u ence of its spring, a rotary setting device, a 65 magnet adapted to be in?uenced by said code current impulses, said magnet being provided with an armature adapted to influence said set— ting device, and means acted upon by said set ting device during its rotation whereby to dis place the testing members of said two sets axial ly relatively to said selecting discs. 10. Type printing apparatus for printing type characters comprising a selecting device for de termining a type in accordance with received 8 2,120,850 code current impulses of the Baudot type, said selecting device comprising a type wheel, a set of selecting discs connected to said type wheel, means rotating said selecting discs and said type wheel, a set of testing members adapted to V in?uence said selecting discs, said testing mem bers being displaceable relatively to said select ing, discs, a rotary setting device for said testing members, a magnet adapted to be in?uenced by 10 said code current impulses, said magnet being provided with an armature adapted to in?uence said setting device, means for rotating said set~ ting device through one revolution, said last mentioned means being controlled by the arnia» 15 ture of said magnet and means for rotating said setting device relatively to said means for ro tating it through one revolution. ‘r1. Type printing apparatus comprising a set of code discs, a typewheel, means for rotating 20 said code discs and said type wheel in-unison, a magnet adapted to receive a train of current im pulses of the Baudot type, a set of testing mem— bers mounted for independent displacement, means for arresting said code discs and said type 25 wheel in various positions dependent upon the relative setting of said testing members, a source of power other than said magnet and means un der the in?uence of said source of power for ef iecting said relative setting of said testing mem 30 bers in accordance with the current impulses re ceived by said magnet. , 7 12. Type printing apparatus comprising a se lecting device for determining a type-in accord ance with received code current impulses of the Baudot type, said selecting device comprising a type wheel, a set of selecting discs connected to said type wheel, a set of testing members adapted to conrtol said selecting discs, a rotary member mounted for axial displacement during its rota 40 tion, means for rotating said rotary member, sta~ tionary means for displacing said’ rotary mem ber axially during its rotation in one direction as said member passes through particular angular positions, a spring urging said rotary member 45 axially in the other direction in all angular posi tions of said member, a magnet operated by said code current impulses and having an armature adapted to. hold said rotary member against dis placement by said spring, and means acted upon 50 by said rotary member during its rotation where by to set said testing member selectively in ac cordance with the axial displacements of said ro tary member. 13. Type printing apparatus comprising a se 55 lecting device for determining a type in accord ance with received code current impulses ‘of the Baudot type, said selecting device comprising a type wheel, a set of selecting discs connected to said type wheel, means for rotating said selecting 60 discs and said type wheel, a set of testing mem bers adapted to control said type discs, a setting device for setting said testing members relatively to said selecting discs comprising a rotary arm, a ring adapted to rotate with said arm, means for rotating saidrarm, a stationary disc provided with camsadapted to displace said arm axially during its rotation, a spring constantly urging said arm towards said stationary disc, a stop adapted to engage between said ring and said disc whereby to hold said arm against displace ment ‘by said spring, electromagnetically con trolled means adapted, under the in?uence of said code current impulses, to determine the en— gagement of said step between said ring and said 10 stationary disc and means acted upon by said arm during its rotation whereby to set said test ing members selectively in accordance with the axial displacements of said arm. 14. Apparatus as claimed in claim 13, in which 15 said electro-magnetic means comprise a magnet having an armature to which said stop is yield ingly connected. 15. Apparatus as claimed in claim 12, com prising also a cam disc adapted to move with 20 said rotarymember, the cams of said cam disc being adapted to press said armature in a pre paratory manner towards the pole of the magnet. 16. Apparatus as claimed in claim 12, com prising also a rotary cam disc adapted to be ro 25 tated together with said rotary member and hav ing a, plurality of cams adapted to press said ar mature towards the pole of said magnet periodi cally during the reception of said code current impulses, said cams being arranged so as to act 30 successively on said armature and being made of increasing lengths. 17. Apparatus for printing types selected in accordance with received current impulse signal trains of the Baudot type, comprising a type 35 wheel, two sets of selecting, discs, means for ro tating said type wheel and said selecting discs in unison, two sets of testing members associated one with one and the other with the other of said sets of selecting discs, a magnet actuated by said received current impulse signal trains, means controlled by said magnet on receipt of successive trains for alternately setting the test ing members of said sets of testing members into relative positions corresponding to the received train, means for bringing said sets of testing members individually with their testing mem bers in said relatively displaced positions into contact with the associated selecting discs where by to cause rotation of said discs to be arrested when said discs assume an angular position de termining the selection of a type on said wheel corresponding to the received train, and a print ing device comprising means .for producing an impression from said selected type, rotary means Ul. LT controlling said type impressing means, a clutch controlling the rotation of said rotary means and an escapement mechanism controlling said clutch, said escapement mechanism being con trolled by said trains of testing members. 60 MAX AMANN. ALFRED LAHL. HANS HATZINGER.