US2859277A - Teletypewriter - Google Patents

Description

H. PRATT TELETYPEWRITER Nov. 4, 1958 5 Sheets-Sheet l Filed June 29, 1955 IN VENTOR Harada BVM vf Lz-mu ATTORNEYS Nov. 4, 1958A H. PRATT 2,859,217

TELETYPEWRITER Filed June 29, 1955 3 Sheets-Sheet 2 Y @59.4. LETTER E l LETT E R LETTER LETTER LETTER LETTER wg 5 INVENTOR Haradezz/ Pratt 7M/m4; M @mu/l BY T'Jfw-wv ATTORNEYS H. PRATT TELETYPEWRITER Nov. 4, 1958 5 Sheets-Sheet 5 Filed June 29, 1955 www INVENTOR.

AZTRNEYS Baradei Pnl/Zt BY M +0 Wlmll hwiwlli United States Patent() TELETYPEWRrrER Haraden Pratt, Springdale, Conn., assignor to Dnalex Corporation, Washington, D. C., a corporation of Delaware Application June 29, 1955, Serial No. 518,774

11 Claims. (Cl. 178-25) The present invention relat'es to apparatus for iuformation transmission and reception and relatesparticularly to a teleprinter or teletypewriter capable of transmitting intelligence while retaining a typewritten copy at the point of transmission and also capable of receiving and typing messages.

The teletypewriter of the invention may be brieily described as comprising a keyboard actuated code signal selecting or forming assembly, a printing assembly and electrical means for transmitting the code signals from the selecting assembly to the printing assembly. -The transmitting means may transmit the selected code signals to a remote printing assembly as well as to the printing assembly associated with the keyboard being operated. The signal selecting assembly includes a plurality of notched permutation bars, power means for shifting such bars and a lever actuated lby depression of a key of the keyboard for engaging the notches in certain of the permutation bars to prevent shifting thereof. The particular key of the keyboard which is depressed determines the permutation bar or group of permutation bars which are shifted. The shifting of any permutation bar or group of permutation bars actuates appropriate switches to select a code signal which is transmitted to the printing assembly. The printing assembly includes a plurality of notched selector slides and selector slide positioning means which is responsive to the code signal received from the signal selecting assembly and which acts to align certain notches in the selector slides. When notches in the selector slides are aligned a pawl attached .to a type actuating bar corresponding to the received code signal is permitted to engage and be actuated by a power operated oscillatory drive roller to cause the printing of the appropriate character.

Among the objects of the invention are to provide a teletypewriter of small size and of simple and inexpensive construction which is capable of high speed of operation, to provide a teletypewriter which utilizes 1n large measure the conventional parts of a Well-known commercially -available electric typewriter, to provide a teletypewriter the mechanical parts of which require no power except when actually receiving or transmitting and printing, to provide a novel means for signal selection which retains the nicety of touch and limited key movement of the conventional electric typewriter, and to provide a teletypewriter which maintains, so far as mechanically possible, manufacturing tolerances which do uot exceed those normally used in standard typewriter design and manufacture.

Other objects and advantages of the invention will be described in the following detailed description which has reference to the accompanying drawings wherein:

Figure l is a cross-sectional View of the portions of a teletypewriter embodying the present invention;

Figure 2 is a view partly in side elevation and partly in cross-section of one of the selector slides with its associated positioning and retaining mechanisms;

Figure 3 is a view partly in end elevation and partly in apart `of the frame of 4the machine.

2,859,277 Patented Nov. 4, `1.958

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The invention as illustrated and described utilizes manyv of the 'conventionalparts of a well-known commercially available electric typewriter and any parts not specilically illustrated or described in this application mayk be considered as conventional in such typewriter. For an understanding of the essential features of such electric typewriter reference may be had to United States Patent No. 2,563,722 which issued August 7, 1951, to Henry J. s

Hart.

The teletypewriter of the present invention invloves no mechanical connection between the keys of the keyboard and the type bars. The keyboard'is utilized in a novel manner to select code signals and the keyboard performs no other function.v The code signals selectedby the keyboard are transmitted to theV printing portion of the teletypewriter. The code signals selected by the keyboard may, of course, also be transmitted to a remotely vlocated teletypewriter, thus obtaining a typewritten copyof the message at both the transmitting point and the remote or receiving poi-nt. The printing portion of the teletypc writer is also responsive to code signals ,received from a remotely located point or from other apparatus such as a tape reader.

Description of the keyboard and the code signal selector mechanism The keyboard preferably includes a conventional number of keys. lt will be suicient to describethe construction and operation of only one such key and its associated mechanism, it being understood that the other keys and their associated mechanisms operate in a similar manner. The key 10 is pivotally mounted at 11 to a cross bar 12 forming a portion of the frame of the machine. The key bar 13 of the key 10 is provided with a rearwardly extending arm 14 which carries a lug 15 ,on its rearward end. The lug 15 is positioned to engage a vertical arm 16 of a bell crank lever 17 which is pivotally mounted at 18 in a cross bar 19 forming l A tensionspring member 20 connects the key bar 13 and the bell'crank lever 17 in the manner shown in the drawing and serves to normally retain the key bar 13 and the bell cran lever 17 in the positions shown in Figure l. -'p

Fixed to the frame of the machine are permutation bar supports 30 which slideably support in side by sidehori-v zontal positions a plurality of notched signal permutation - bars 31, 32, 33, 34 and 35. The supports 30 also rigidlysupport a comb guide 36 which provides vertical guideways for the horizontal arms 21 of the bell crank levers 17.

A generally U-shaped member 40 has its open ends pivotally mounted to the frame of the machine at `11 and has its closed end extending under the key bars 13 of all keys 10 of the machine. The U-shaped member 40 carries a switch actuating member 41 which engages and depresses spring contact member 42 of a single switch designated generally by the reference numeral 4 3. It will be understood that engagement of the spring contact member 42 with the rigid contact member 44 will close the switch 43 upon depression of any key.

an individual switch 61, 62, 63, 64 and 65. fswitch 61 is illustrated in Figure 4, the remaining switches 'being shown in Figure 6. The switches 61 to 65 are iden- :tical and include a stationary contact arm 72 and a movable contact arm 73. The movable contact arm of switch 61 is movable by means of a lever 74 which is pivotally Amounted at 75 and which engages a notch 76 in the The arrangement of the signal permutation bars 31, 32, 33, 34 and 35 can be better understood by reference to Figure 4 where those bars are shown in vertically disposed or exploded relationship rather than in their actual side by side relationship as illustrated in Figure 1. Each fof the signal permutation bars 31 to 35 is provided with `an individual first spring member 50, which biases or tends to urge its associated permutation bar to the left as seen-in Figure 4. The end of each of the signal permutation bars is engaged by the armature 51 of an elec- 'tromagnet 52 which is energized by closing of the switch 43. When the electromagnet 52 is de-energized armature V'51 is held in the position shown in Figure 4 by means of a'spring member 53 which is of sutlicient strength to -overpower all of the spring members 50 and to retain the permutation bars in the positions shown in Figure 4.

1 Each of the permutation bars 31 to 35 is provided with Only the permutation bar 31. The switches 62, 63, 64 and 65 are Vsimilarly equipped and arranged with respect to the permutation bars 32, 33, 34 and 35 respectively.

Operatively associated with all of the permutation bars '31 to 35 is a single switch 80 having a stationary contact arm y81 and a movable contact arm 82. The movable contact arm 82 is moved to close the switch 80 by means kof a lever 83 which is pivoted at 84 and which engages notches 85 in all of the permutation bars 31 to 35. 'I'his arrangement causes the switch 80 to be closed upon movement of any of the permutation bars to the left from the positions shown in Figure 4. The switch 80 is preferably closed a short time interval after the closing of any of the switches 61 to 65.

Operation of keyboard and code signal selector mechanism Let it be assumed that the key l10 corresponding to the letter E is depressed. The lug 15 engages the vertical varm 16 of the bell crank lever 17 and causes the hori- 'zontal arm 21 of the lever 17 to enter the notches 90,

91, 92, 93 and 94 of the permutation bars 31 to 35, respectively. The position of the arm 21 is diagrammatic'ally illustrated by dotted lines in Figure 4 and is designated by the reference numeral 21'. After the arm 21 has entered the notches 90 to 94 but before the key '7107has completed its downward travel, the switch 43 closes to energize electromagnet 52. Energization ofthe 'electromagnet 52 pulls its armature 51 out of engagement with the ends of the permutation bars and thereby stretches the spring 53 and renders that spring ineffective. The springs 50 are then free to attempt to move all permutation bars to the left as seen in Figure 4. lOnly the permutation bar will be moved to the left for the reason that the notch 94 therein has a leftwardly facing with and will provide the associated electrical system with a code pulse corresponding to the letter E. The closing of thev switch 65 is accomplished by the initial leftward movement of the permutation bar 35. A short time after closing ofthe switch 65, the continued leftward movement of the permutation bar 35 will elect closing of the switch 80 which provides thekassociated electrical system with the printing pulse, sometimes called the sixth pulse.

It will be understood that the permutation bars 31 to 35 are notched for all characters and operating functions of the machine. Only the notches for the letters 12, Y and T are shown in Figure 4. It can he seen from inspection of Figure 4 that if the key 10 corresponding to the letter Y is depressed the permutation bars 31, 33 and 35 will move to the left because of the fact that their leftwardly facing shoulders 95, 96 and 97 are rightwardly spaced from the horizontal arm 21 corre-` This results inv closing the` When any depressed key 10 is released by removal of the operators finger, the switch 43 first opens to de-ener-v gize the electromagnet 52. Spring 53 then overpowers the combined force of the springs 50 and returns the permutation bars to their neutral positions as shownin Figurev4. The'spring 20 returns the key 10 to its upward position and also rotates the bell crank lever 17 in a counter-clockwise direction to withdraw the arm 21 from the notches in the permutation bars. If the arm 21 should be momentarily bound by engagement with the shoulders of the notches in the permutation bars, the `key 10 will nevertheless rise freely because of the fact that the lug 15 can withdraw from the vertical'arm 16 of thebell` crank lever 17. However, this binding of the arm 21 will be onlykmomentary because of the fact that the spring 53 will almost immediately restore the permutation bars to their neutral positions in which there is no binding engagementrwith the arm 21.

It has been pointed out that the appropriate switches 61V to 6'5 are closed before the closing of the switch 80 so'that the selection of the code pulses corresponding vto the desired letter will precede the printing or sixth pulse.

This arrangement is desirable but is not ordinarily critical for the reason that the inertia of the printing mechanism hereinafter described exceeds that of the selector slides hereinafter described and there will, therefore, inherently be a time-lag between the actuation of the selector slides and the printing operation. It is also possible to build a time-lag into the electrical system as hereinafter described.

' It will be seen that in depressing a key 10 the only energy required of the operator is that suflicient to rotate the bell crank lever 17 against the action of the spring 20 and to close the switch 43. The bell crank lever 17`is essentially identical for all keys and the identical switch 43 is, of course, closed by depressing any key. The uniformity, lightness andnicety of touch of the keyboard is thus assured. The work of closing the switches 61 to 65 and 80 is transferred to the electromagnet 52. This is an important feature of the invention because itassures uniformity of touch of all keys irrespective of the number of switches which must be closed to provide a .code signal corresponding to the depressed key. For

example, a code signal corresponding to the letter E requires closing only the switches 61 and 80 while depression of the key corresponding to the letter Y requires the closing of switches 61,- 63, 65 and 80. The uniformity of touch of the keys ycorresponding to the letters E and Y would obviously be dihcult to attain Vif`,the appropriate switches were to be closed manually` rather than through the intervention of the electromagnet 52.

Description of the printing mechanism and the selector slides The printing mechanism includes a plurality `of type bars of which only one is shown in the drawing and designated by the reference numeral 101. The type bar 101 is pivot'ally mounted at 102 and is adapted to be moved from the full line position shown in Figure 1 to the dotted line position to engage a platen 103 in a man ner well understood in the typewriter art. The type bar 101 is connected by a link 104 to a type bar actuating lever 105 which is pivotally mounted at 106 to a cross bar 107 which forms a portion of the frame of the machine. An actuator bar 108 is pivotally connected to the lever 105 at 109. A pawl designated generally by the reference numeral 110 is pivotally connected to the actuator bar 108 at 111. The pawl 110 has a nose portion 112 which is arranged to normally rest on an arcuate portion 113 of an oscillatory drive roller 114. The pawl 110 also has a tail portion 115 which is positioned below the drive roller 114 in close juxtaposition to the selector slides hereinafter described. The pawl 110 thus straddles the drive roller 114. A spring member 120 urges the nose portion 112 of the pawl into engagement with the -drive roller 114.

The type bar 101, actuating type bar levery 105, actuator bar 108 and pawl 110 are movable from the full line positions shown in Figure l tothe dotted line positions :shown in that ligure by mechanismhereinafter described. 'The foregoing elements are biased to their full line positionsby means of a spring member 121 secured to the type bar operating lever 105 and to a cross bar 122 which forms a portion of the frame of the machine. It will be understood that there is a type bar actuatingV lever 105, an actuator bar 108V and a pawl 110 for each type bar 101 of the machine.

Positioned below the tail portions 115 of the pawls 110 and in parallel relationship to the drive roller 114 are aplurality of selector slides 131, 132, 133, 134, 135. These selector slides are slideably mountedin stationary supports 136 and 137. The actual positions and rela- ..t..v, ,tionship of selector slides is shownrin Figure 1 while the selector slide 131 is shown in detail in Figure 2. The selector slides are shown diagrammatically in vertical spaced or exploded relationship in Figure 5. When the drive roller 114 is in its full line position illustrated in` Figure 1 the nose portions 112 of all pawls 110 rest on the arcuate surface 113 of the drive roller and the tail portions 115 of all pawls are heldV out of engagement in general vertical spaced relationshipefrom the selector slides 131 to 135.

Each of the selector slides 131 kto 135 is provided with a spring member 150 which tends to retain its associated slide in its rightward or full line'position shown in Figure 5. The selector slides are provided with solenoids 152, 153, 154, 155, 156 respectively. The solenoid 152. associated with the selector slide 131 is illustrated in Figure 2. The remaining solenoids 153 to 156 associated with the selector slides 132 to 135 are similar and are Aillustrated diagrammatically in Figure 6. kThe solenoidv 152 is provided with an armature 160 which is pivoted at'161 and which engages notch 162 in the selector slide 131. The solenoids 153 to 156 are smiliarly equipped and associated with their respective selector slides.V solenoids 152 to 156 will move its associated selector slide to the left from the full line position shown in Figure 5. The selector slide 131 is provided with a latch 165 `which is pivotally mounted atV 166 to the frame of the machine. The latch 165 is urged toward the selector "slide, 131 by means of a spring member 167 and when the selector slide 131 is moved by its Solenoid 152v the latch 165-engages a notch 168y and momentarily retains IIh'esele'ctor slide 131Y in the shifted position. The-se- It will be seen that energization of any of the Iector'slides 1'32 to 135 are provided with simila'rlllatches 172, 173, 174 an 175 respectively-(see-Figure 3)..k

The drive roller 114 is oscillated throughjthe angle a (in counterclockwise direction as seen in FigureY l.) by means of a rotary solenoid 180 having an armv 181 connected to the drive roller by means of a link 1821 A spring 183 connected to the link 182 and to a stationary portion 184 of the frame ofthe machine returns the drive roller to its full line position shown in Figure 1 when the rotary solenoid 180 is de-energized.

Energization of the rotary solenoid 180 causes the drive roller 114 to turn through angle a in a clockwise direction as seen in Figure 3. A finger cam 190 `is pivotally connected to the drive roller 114 at 191 and is biased against a stop member 192 onthe drive roller by means of a spring 193'. A cam follower 194 is slideably mounted in a portionl 195 of the frame of the machine and is positioned above the latch members V165, 172, 173-, 174 and 175. Oscillation of the drive roller 114 in a clockwise direction'as seen in Figure 3 (caused by energization of the rotary solenoid`180) causes the nger cam 190 to move the cam follower 194 to disengage any of the latches which may be holding selector slides in shifted positions. y

The forward end of the actuator bar 108 is guided by Va comb guide 200 which is secured to the cross bar 12. Oscillation of the drive roller 114 upon energizationof the rotary solenoid 180 will, in'a manner hereinafter de# scribedpermit the nose portion 112 of a single pawl 110 to enter a groove 205 in thei drive roller to engage a shoulder 206 and to cause the pawl 110, the actuator bar 108, type bar actuatinglever` and type bar101 to move from'the full line positions shown in Figure 1" 4to the dotted line positionsshown in that figure.l The` sta tionary bars 210, and 211 cooperate respectively witha nger 212 on the actuator bar 108 and a nger 213 on the pawl for the purpose of disengaging'the nose portion 112 of the pawl 110 from the shoulder 206 of the drive roller 114 at a pre-determined timeduring the movement of the mechanism while performing the printabove-mentioned Hart Patent No. 2,5 63,7 22.4

Operation of the printing mechanism vand selector slides For the purpose of describing the operation of the selector slides and printing mechanism it will be assumed that a code signal corresponding to the letter E has been received by the apparatus. This code signal may have been received from the keyboard and permutation bar mechanism described above or it may have been received from a remote transmitting mechanism ora tape reader. InV any event, the received code signal corresponding to the letter E will energize only the solenoid'156 (Figure 6) and will shift the selector slide from theV full line position shown in Figure 5 to-'the dotted line position shown in that figure. The selector slide 135 is retained momentarily in this shifted position by its associated latch 175. The selector slides 131 to 135 will then have notches in their edges adjacent to drive roller 114 which are in alignment, and the tail portion 115 of the pawll 110 associated with theV letter E is capable of entering those aligned notches, but this is the only' tail portion'of any pawl. 'which lies' above aligned notches in the selector slides. The sixthk pulse or printingl pulse is then received and serves to energize the rotary solenoid to oscillate the drive roller'114 in the counterclock- Wise direction as seen in Figure 1. The nose portion 1112 of all pawls 110 will drop partiallyinto the groove 205'of thedrive roller butall pawls except 'tliat'crL asma?? respondingfto `the letter. .E will berestraned by the selector slides -omldropping 4far enough into the groove 205 to engage the shoulder 206. The pawls which are restrained bythe selector slides will engage and ride upwardlyon the. ramp portion 220 of the drive roller. The nose portion 112 of the pawl 110 corresponding to the letter E will be engaged by the shoulder 206 on the drive roller 114 and the letter E will be printed in a manner which will be apparent from the foregoing description.

Assoon as the nose portion 112 of the pawl 110 corresponding to fthe letter E has been engaged by the shoulder 206 and the printing operation has been initiated, the linger cam 19,0 engages camfollower 194 which operatesto release the latch 175 from the selector slide 135. The selector slide then returns to its neutral position underthe inuence of its spring 150 and all selector slides are then ready for the reception of a subsequent code signal. In this manner the apparatus is -capable of preparing itself for printing of a subsequent character while the printing operation of one character is being completed. Upon de-energization of the rotary solenoid 180 the drive-roller 114 returns to its original position and during such movement the :Enger cam 190 rides over the cam follower 194 without movement of the cam follower. Figure 5 also illustrates the notching of the selector slides for the letters Y and T. It will be understood-that the selector slides are notched for all characters and yoperating functions but it is suicient for the purpose ofunderstanding the invention to describe the printing of y:onlya lfew characters. Assuming the apparatus receives the code signal corresponding to the letter Yj the solenoids 152, 154 and 156 will be energized and the selector slides. 131, 133 and 135 will be shifted to permit the tail portion 115 of the pawl 110 corresponding to the letter .Y to enter aligned notches in the selector slides. T heiletter Y will then beprinted in the manner described above. Similarly, if the apparatus receives a code signal corresponding to the letter T the solenoid 152 be energized and the selector slide 131 will be shifted so that the tail portion 115 of the pawl 110 corresponding to the letter T will enter aligned notches in the selector slide tok cause printing of the letter T.

i The modification of Figure 7 Figure 7 diagrammatically illustrates the wiring diagram for a slightly modiiiedform of the apparatus. The parts which are identical to the elements already described are designated by corresponding reference numerals. In this modiiication the electromagnet 52a, which corresponds to the electromagnet 52 and the associated permutation bars and springs, is used to close only the switches 61, 62, 63, 64 and 65. Switch 43a, which is closed by depression of any key and which corresponds to the switch 43 is in this instance a doublethrow switch. The contact 230 is normally closed and serves to maintain relay 231 in energized condition. The Winding of relay 231 is shunted by a condenser 232. Contact 233 of relay 231 is open while that relay is energized. Depression of any key on the keyboard actuates switch 43a to open contact 230 and close contact 234. The closing of contact 234 energizes electromagnet 52a toshi-ft the proper permutation bars to actuate the appropriate switch or combination of the switches 61 to 65. The opening of contact 230 breaks the circuit to relay 231, but Vthe condenser 232y prevents that relay from deenergizing for a length of time suicient for the appropriate lshifting of the permutation bars. After a short and predeterminable time relay 231 will become dee'ner'gized to 'close contact 233 `and energize printing solenoid180. v l

. ,This arrangement assures that the printing .function notbe initiated lfor a brief time interval Vafter the switch 43a has been closed by kdepressing a keyof the keyboard.4 time interval adequate; to'permit appropriate shifting of the permutation bars, The time l interval can be adjustedV by varying the capacitance of the condenser 232. All other portions of the apparatus illustrated 'in Figure v7 operate in the manner described above. .Y .f

Attention iscalled to the fact that the mechanical portions ofthe apparatus consume no power except during the actual reception and printing of a character.' This is an important advantage of the invention in that the machine can be leftfunattended in a remote location and will utilize no power except when actually receiving and typing a message. v

The tail portions of all pawls 110 are maint ed out of engagement with the selector slides while those slides are being shifted. This prevents frictional resistf ance to movement of the selector slides and reduces the amount of power required to operate solenoids 152 t l 'Ihe teletypewriter according to the present invention is capable of utilizing the chassis, the housing, and many of the conventional parts of the presently commercially available electric typewriter. This fact contributes to economy of production and facilitates the problem of servicing ofthe apparatus.

I have illustrated and described what I now consider to be the preferred form of my invention. It should be understood that various modications and alterations may be made without departing from the broader scope of the invention as delined by the following claims.

I claim:

1. In a teleprinter, a key, a plurality of parallel signal permutation bars, a lever extending transversely of said permutation bars and actuated -by depression of said key to engage said permutation bars, means biasing each of said bars longitudinally in a lirstvrdirection, spring 'means Y the shoulders on the remaining bars being spaced from Y said lever, motor means having an energizing circuit closed by depression of said key and operative to reduce the effect of said spring means on said bars to permitsaid biasing means to move suchremaining bars in said rst direction, and switch means responsive to movement of such remaining bars in said rst direction to selecta code signal. i

2. In a teleprinter, a plurality of keys, a .plurality of parallel signal permutation bars, a lever for each of said keys extending transversely of said permutation bars and actuated by depression of its respective key to engage said permutation bars, lirst spring means tending to move each of said bars longitudinally in a first direction, second spring means normally overpowering said first spring means and holding said bars aga-inst movement in said lirst direction, each of said bars having a shoulder thereon for each of said levers and facing in said first direction toward its corresponding lever, a shoulder on at least one of said ba-rs being positioned adjacent its corresponde ing lever and the corresponding shoulders on the remainingbars being spaced from such lever, motor means having an energizing circuit closed by depression of any of said keys and operative to reduce the effect of. said second spring means on said bars to permit said rst spring means to move such remaining bars in said lirst direction, and switch means responsive to movement of:

direction to select a such remaining bars in said 'irst means and holding said bars against 'movement in said first direction, the notches in said bars forming shoulders facing in said rst direction toward said lever with the shoulder on at least one of said bars being positioned ad jacent said lever and with the corresponding shoulders on the remaining bars being spaced from said lever, motor means operative to reduce the effect of said second spring means on said bars to permit said first spring means to move such remaining bars in said rst direction, a switch closed by depression of said key for energizing said motor means, and switch means responsive to movement of 4such remaining bars in said first direction to select a code signal.

4. In a teleprinter, a plurality of keys, a plurality of parallel signal permutation bars, a lever for each of saidkeys extending transversely of said permutation bars, means actuated by depression of each key to move its corresponding lever to engage said permutation bars, iirst spring means tending to move each of said bars longitudinally in a first direction, second spring means normally overpowering said first spring means and holdingsaid bars against movement in said rst direction, said bars having shoulders thereon facing in said rst direction toward a bar engaging lever with the shoulder on at least one of said bars being positioned adjacent such bar engaging lever and with the shoulders on the remaining bars being spaced from` such lever, motor means operative to reduce the effect of said secondv spring means on said bars to permit said first spring means to move such remaining bars in said first direction, a single switch operated by depression of any of said keys for energizing said motor means, and means responsive to movement of such remaining bars lin said first direction to form a code signal.

5. In apparatus for establishing a code signal, a key, a plurality of parallel signal permutation bars, a lever extending transversely of said permutation bars and actuated by depression of said key to engage said permutation bars, first spring means tending to move each of said bars longitudinally in a first direction, second spring means normally overpowering said iirst spring means and holding said bars against movement in said first direction, said `bars having shoulders thereon facing in said iirst direction toward said lever with the shoulder on at least one of said bars being positioned adjacent said lever and with the shoulders on the remaining bars being spaced from said lever, motor means having an energizing circuit closed by depression of said key and operative to reduce the effect of said second spring means on said bars to permit said first spring means to move such remaining bars in said lirst direction, and means responsive to movement of such remaining bars in said first direction to establish a code signal.

6. ln apparatus for establishing a code signal, a key, a plurality of parallel signal permutation bars, a lever extending transversely of said permutation bars and actuated by depression of said key to engage said permutation bars, first spring means tending to move each of said bars in a first direction, second spring means normally overpowering said first spring means and holding all said bars against movement in said first direction, certain of said bars having shoulders thereon facing in said irst direction toward said lever and positioned adjacent said lever and the remaining bars being devoid of shoulders facing in said irst direction closely adjacent said lever, motor means having an energizing circuit closed by depression of said key and operative to reduce the effect of said second spring means on said bars to permit said first spring means to move such remaining bars in said first direction, and switch means responsive to movement of such remaining bars in said rst direction to establish the pulses of a code signal.

7. In a teleprinter, a key, a plurality of parallel signal 10 permutatioribars', .a lever extending transversely of' said permutation bars and actuated by depression of said key to engage said permutation` bars, iirst spring means tending to move'each of said bars longitudinally in a iirst direction, second spring means normally overpowering said first spring means and holding said bars against movement in said first direction, said bars having shoulders thereon facing in said first direction toward said lever with the shoulder on at least one of said bars being positioned adjacent said lever and with the shoulders on the remaining bars being spaced from said lever, motor means having an energizing circuit closed by depression of said key and operative to reduce the effect of said second spring means on said bars to permit said iirst spring means to move such remaining bars in said first direction, first switch means responsive to movement of such remaining bars in said rstdirection to select the pulses of a code signal, second switch means responsive to movement of any of said bars in said first direction to provide a printing pulse, an oscillatory drive roller having an arcuate surface thereon and a groove therein, a plurality of selector slides parallel to said drive roller, said selector slides being positioned adjacent a surface of said drive roller generally diametrically oppositev said groove, said selector slides having notches in the edges thereof adjacent said drive roller, a type bar actuating lever, an actuator bar connected to said lever, a pawl pivotally mounted on said actuator bar, said Apawl having a nose portion, means urging said nose portion toward said drive roller to engage said arcuate surface of said roller and to. enter said groove upon oscillatory movement of said roller, said pawl having a tail portion positioned between said roller and the notched edges of said selector slides, said tail portion of said pawl being" positioned in spaced relation to said notched edges of said selector slides while said nose portion of the pawl is in engagement with said arcuate surface of said drive roller and said tail portion entering aligned notches in said selector slides when sad nose portion enters said groove in said drive roller, selector slide positioning means responsive to said pulses of a code signal to position said selector slides to align notches therein adjacent said tail portion of said pawl, an electromagnet responsive to said printing pulse to oscillate said drive roller to initially cause said nose portion to enter said groove and to subsequently rn'ove said actuator bar and said type bar actuating lever, and means for transmitting said pulses of a code signal and said printing pulse to said selector slide positioning means and to said electromagnet respectively.

8. In a teleprinter, an oscillatory drive roller having an arcuate surface thereon and a longitudinal groove therein, a plurality of selector slides parallel to said drive roller, said selector slides being positioned adjacent a surface of said drive roller generally diametrically opposite said groove, said selector slides having notches in the edges thereof adjacent said drive roller, a type bar actuating lever, an actuator bar connected to said lever, a bifurcated pawl pivotally mounted on said actuator bar and straddling said drive roller, said pawl having a nose portion on one leg thereof, means urging said nose portion toward said drive roller to engage said arcuate surface of said roller and to enter said groove upon oscillatory movement of said roller, said pawl having a tail portion on the other leg thereof positioned between said roller and the notched edges of said selector slides, said tail portion of said pawl being positioned in spaced relation to said notched edges of said selector slides while said nose portion of the pawl is in engagement with said arcuate surface of said drive roller and said tail portion entering aligned notches in said selector slides when said nose portion enters said groove in said drive roller, selector slide positioning means responsive to code pulses of a signal to position said selector slides to align notches therein adjacent said tail portion of said pawl, and an edges thereof adjacent said drive roller, ,-a type bar actuating lever, an actuator bar connected to said lever, a pawl pivotally mounted on said actuator bar, said pawl having a nose portion and a tail portion, means urging said nose portion toward said drive roller to engage said arcuate surface of said roller and to enter said groove upon oscillatory movement of said roller, said tail portion being positioned between-said roller and the notched edges of saidrselectorslides and being in spaced relation to said notched edges of said selector slides while .said nose portion of the pawl is in engagement with said arcuate surface of said roller, said tail portion entering aligned notches in said selector slides when said nose portion entersk said groove in said drive roller, selector slide positioning means responsive to code pulses of a signal to position said selector slides to align notches therein adjacent said tail portion of said pawl, and an electromagnet responsive to a printing pulse of such signal to oscillate said drive roller to initially cause said nose portion to enter said grove and to subsequently move said pawl, said actuator bar and said type bar actuating lever.

10. In a teleprinter, an oscillatory drive roller having an 'arcuate surface thereon and a groove' therein, a plurality. of selector slides parallel to said drive rollen-said selector slides Vbeing positioned adjacent a surface of said drive roller generally diametrically opposite said groove, said selector slides having notches in the edges thereof adjacent said drive roller, a type bar actuating lever, an actuator bar connected to said lever, a pawl pivotally mounted on said actuator bar, said pawl having a nose portion, means urging said nose portion toward said drive roller to engage said arcuate surface of said roller and .to enter said groove upon oscillatory movement of saidlroller, said pawl having a tail portion positioned between vsaidrollerand the notched edges of said selector slides, said tailportion of said pawl being positioned in spacedrelation to said notchedredges of said selector slides'` While said nose portion of the pawl is inengagement, withY said arcuate surface of Vsaid drive rollerl and said tail `pro'rtionentering aligned` notches in said/selectorr slides When-said noseportion enters said groove in said drive roller, Vselector slide positioning means responsiveto code pulses of a signal `to position said selector slides .to align notches Ytherein adjacent said tailportion ofsaid pawl, latch means retaining said selector. slides in such notch aligned position, an electromagnet responsive Vto a printing pulse of such signal to oscillate said drive roller to initially cause said nose portion to enter said groove andfto Vsubsequently move said pawl, saidactuator wbar and, sairltypebar lactuating lever, and cam means carried by said drive roller 'and operative uponA oscillatory movementof said rollerV to disengage said latch means. 11; In a teleprintena key, a plurality of parallell signal permutation bars, a lever extending transversely of saidpennutat ion bars and actuated by depression of said key Atoengage said permutation bars, rst spring means, tending vto moveV yeach of said bars longitudinally ina iirstdirection, second spring means normally overpowering said rst Spring rmeans and holding said bars against movement in said rst direction, said bars having shoulders thereonfacing in said iirst direction toward said lever vvithrthe shoulder on Aat least one of said bars being positioned adjacent Said lever and with the shoulders ,ouV the remaining bars being spaced from said lever, motor means having an energizing circuit closed by depression of saidkey and operative to reduce the eiect vof said secondv spring means onvsaid bars tospermit said first spring means toi movesuch remaining bars in said rst direction, first switch means responsiverto movement of such remainingbars Vin said rst direction to select ythe pulses'offa; code signal, and second switch means re-, sponslve to movement of `any of said bars in said rst direction to provide4 a printing pulse.

' 4 References Cited in therfile of this patent UNITED STATES PATENTS

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