US2247162A - Start-stop code transmitter - Google Patents

Start-stop code transmitter Download PDF

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Publication number
US2247162A
US2247162A US220682A US22068238A US2247162A US 2247162 A US2247162 A US 2247162A US 220682 A US220682 A US 220682A US 22068238 A US22068238 A US 22068238A US 2247162 A US2247162 A US 2247162A
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US
United States
Prior art keywords
code
lever
levers
bars
letters
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US220682A
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English (en)
Inventor
Beccio Giuseppe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Firm Ing C Olivetti & C S A
Original Assignee
Firm Ing C Olivetti & C S A
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Firm Ing C Olivetti & C S A filed Critical Firm Ing C Olivetti & C S A
Application granted granted Critical
Publication of US2247162A publication Critical patent/US2247162A/en
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L17/00—Apparatus or local circuits for transmitting or receiving codes wherein each character is represented by the same number of equal-length code elements, e.g. Baudot code
    • H04L17/02—Apparatus or circuits at the transmitting end
    • H04L17/04—Apparatus or circuits at the transmitting end with keyboard co-operating with code-bars
    • H04L17/06—Contact operating means

Definitions

  • This invention relates to the mechanism for the transmission of signals in machinesof the 'unrhythmical type known as start-stop and controllable from a distance, in which the depression of each key of the keyboard brings about the displacement of ,five code bars'to form any one of 32 possible combinations each corresponding to a signahand of which areallocated to the operation of the machine for the purpose of (1) spacing the letters, (2) lines feeding (3 shiftingthe letters to symbols and vice-versa (4) carriage returning. The remaining 27 combination'seach correspond to two signals, one a letter and the other a symbol. 1
  • each key efiects the composition of the corresponding code and the making of a connection which sets a series of suitably spaced cams into rotation, these cams serving to spread over a given period of time and to send into the line the electrical current transmission impulses which reproduce the formed code, as Well as the two impulses for the starting and stopping of the receiving apparatus.
  • the arrangement according 'to the invention enables two keys to be operated in succession in less time than is necessaryior the transmission of a signal and with a variation of the regularity of the rhythm which is necessary with known machines, so that it is made possible to attain a mean speed of operationwhich is very close to the maximum speed possible with the machine, and even by inexperienced operators.
  • the invent-ion further provides'for the automatic change-over from the position of letters to that of symbols and vice-versa when, after the transmission of a certain number of letters or symbols it is required to transmit symbols or letters.
  • the transmitting apparatus automatic-ally emits the code symbols or the code letters, whilst the codeof the symbol or of the letter remains registered or stored in the transmitting apparatus and is transmitted as soon as the change-over has been effected. In this way, upon the depression of a key corresponding to a symbol, or to a letter,
  • the camshaft makes two revolutions instead of one and during the first revolution transmits the code symbols or the code letters whilst during the second rotation there is transmitted the code of the symbol or of the letter corresponding to the key which was depressed.
  • Fig. 1 shows the apparatus at rest
  • Figs. 2 and 3 show the apparatus in two positions which they may occupy during the transmission of a code
  • Figs. 6, 7, 8 and 9 show details of the mechanism
  • Figs. 12 and 13 show an arrangement for pre-'- venting the release of the group of cams during the change-over;
  • Figs. 16 and 17 show a modified arrangement permitting an increase in the speed of operation.
  • a universal bar I provided with pivot pins is mounted parallel to the code bars I.
  • Bar 1 is also provided with teeth which are inclined in all cases towards the right so that the depression of any key effects a displacement of the bar 1 towards the left.
  • the spring 8 serves to return the bar I to the right.
  • the bar I is pivotally connected at 9 with a balance beam III which is capable of oscillating about an axis II.
  • To this balance beam is connected a toothed pawl I3 through the medium of a pivot I2.
  • a spring I4 urges the pawl I3 downwards in such a manner as to cause it to engage with the outwardly bent extremity I5 of a lever I6 which is rigidly connected, through the medium of a spindle II,
  • a cam '24 which actuates a roller 25 mounted upon a lever 25 arranged to oscillate about an axis 21.
  • a link 28 connects lever 26 with a further lever 29 which is rigidly mounted upon a shaft 30 upon which is also rigidly mounted a frame 3I which embraces five levers 33 arranged parallel to one another and corresponding respectively to the code bars.
  • the ends 34 of the levers 33 are formed with points which lie opposite to the extremities 4 of the code bars, which are also pointed.
  • Each of the levers 33 is connected to the frame across five springs 32 and through a pivot 36 with a corresponding balance beam 31 which is capable of rocking about an axis 38.
  • the five balance beams 31 are" in turn connected respectively through a pivot 39 to five slides 40 which move through the engagement of slots therein with guide pins 4
  • the cam 24 effects a displacement of the frame 3I and also through the springs 32 of the five levers 33, and thelatter are caused to engage by their pointed ends 34 against either the right or the left. hand face of the pointed ends 4 of the code bars..
  • the face engaged with depends upon the position which the code bars have taken up.
  • the levers 33 are displaced to the right or to the left and the balance beam 31 is caused to rock to move the slides 40 which reproduce the code formed by the bars I.
  • the slides 40 (Fig. 1) are arranged five levers 43 which are capable of oscillating about an axis 44 and are so urged by springs 45 that a projection 46 on each is maintained in engagement with the respective cams 41 which are suitably freed.
  • the central one of the five levers 43 consists of a single piece as shown in Fig. 6, while the others are each formed of two pieces 43 and 5fl as shown in Figs. 7 and 8 connected to one another after the manner of tongs by a pivot 48.
  • the time may be varied after which a successive signal can be registered, to remain stored during the'preceding transmission. It is, however, always essential that the new registration shall not be carried out before the cam 22 has disengaged the tooth of the pawl I3 from the tooth l5 and the system comprising the bars I, the balance beam III and the pawl I3 has re turned to its rest position, so that the succeeding depression of a key disengages the coupling anew to permit it to efiect a further rotation.
  • the bar 54 If a symbol key is depressed after one has written letters, the bar 54 is displaced towards the .left and remains thereduring the .time'that all succeeding symbols are written. It returns to the right when a letter key is depressed and remains there throughout the writing of succeeding letters.
  • the roller 55 which is urged by a spring 56 against a tooth 51 retains the bar in the one or the other of these positions.
  • the bar 54 through the medium of the pivotal connection 58, controls the threearmed lever 59 which is arranged to rock about a pivot 60.
  • serves through a link 62 to control the movements of a frame 63 which is mounted to rock about an axis 64 and which at its upper end carries a transverse member III! which extends over all the slides 40.
  • the arm 65 controls a frame 66 which is rockable about an axis 61.
  • Frame 66 is of a form which presents an arm 68 upon which four levers 69 are pivoted.
  • Each of these levers supports a pivot 49 which is interposed between parts 43 and which form the first pair and the last pair of the group of five levers 43.
  • the pivots 49 When the pivots 49 are interposed between the extensions Ill and 'II of these levers, these levers bring about a transmission just as though they were formed in one piece.
  • a tooth I2 is formed integral with frame 63 and this tooth is adapted to engage with a tooth 53 on the one-piece central lever 43 having the shape shown in Fig. 6.
  • the axis 61 is not fixed, but is mounted upon a frame 13 arranged to pivot about an axis I4. formed rigid with this same frame.
  • the first mentioned lever 15, together with a spring 11, controls the frame I8 in its movements about the axis I9.
  • the frame I8, like frame I3, is provided with a sideways extension which extends over the slides 40.
  • the second mentioned lever 16 is subjected through the medium of a link 80 to the movement of the carrier for the characters or of the carriage of the machine, or in otherwords, the member of the printing part of the machine which takes up two different positions for printing the letters or symbols.
  • the machine is adapted to print letters when the lever It is in the position shown and symbols when in the position indicated in dotted lines in Fig. 4.
  • the link descends and causes the frame 15 to oscillate on the axis I4, taking with it the pivots 49, the hook l2 and the frame I8 into the position shown in Fig. 10.
  • the pivots 49 entering anew between the extensions 10, H, the hook I2 is withdrawn so that it no longer retains the teeth 53.
  • lever 82 (Fig. 12) fixed on the shaft 14 and terminating in a point, causes during its movement on the pivot 14, an oscillation of a cranked lever I33 arranged to rock on a pivot I04.
  • This lever is arranged to make a return movement under the tension spring I05 to its rest position as soon as the point of the lever 82 has moved past the pin Itt by which it controls the lever I83.
  • lever 13 raises a pointer 83 which is normally held by a spring III! in engagement with a fixed abutment I08.
  • This pointer is provided with a projection shaped as shown in the drawings, and is connected with a pneumatic brake formed by a cylinder 85 in which is mounted a movable piston fitted with a valve H3 which when open permits the rapid movement of the piston towards the right,
  • the pointer 83 is normally to be found in its position to the left as a result of the tension of the spring I07. In this position the raising of the pointer is Without any effect upon the lever H5 in View of the shape of the latter. However, in the transmitting.
  • the pivot I I6 slides during each rotation against the projection I09 so that the lever 83 is always urged towards the right, which in practice, as a result of the delay imposed upon the movement thereof by the brake 85, remains stationary in this position and it responds to the spring I01 only when the transmission is finished.
  • the air brake may be substituted by any other suitable arrangement depending upon friction or inertia or the like to delay the return of the lever 83 to its position of rest under the action of spring II.
  • the frame I3 is connected icy alink 91 with lever 98 pivoted upon a spindle 99, and this lever carriesa pin I00 at its extremity in a position where it can operate upon the teeth 89 and 90.
  • the position of the bar 54 in Fig. 14 corresponds to the position letters.
  • the pin I00 moves against the tooth 90.
  • the pin I08 depresses the tooth 90, expanding the spring 94, and moves into the position shown in Fig. 15, whereupon the tooth 90 returns to its normal position.
  • the speed of operation of the machine may, however, be increased by keeping the time required for effecting the automatic change from the letters position to the symbols position to a minimum, and this result may be achieved by the use of the arrangement illustrated in Figs. 16 and 17. It has already been seen how the displacement of the carriage or of the plate hearing the characters, for adjustments between the letters and symbols positions, by acting upon the link brings the transmission mechanism back into the condition for transmission of the signal previously registered and for subsequent normal transmission. At the moment of automatic change-over therefore, an interruption of the transmission occurs since inevitably the carrying out of the transmission of the code letters or symbols must be awaited as well as the execution of movement by the machine parts.
  • levers I2I pivoted at I22 and these are made to rock as a result of the longitudinal displacement of the bars.
  • the levers I2I are all shaped as shown in the drawings with the exception of the central lever which has the shape shown in dotted lines.
  • lever "I6 is no longer provided but it is substituted by two arms I36 and I24 disposed in two different planes and connected respectively through links I23 and I25 to two frames I26 and I21 arranged to rock on an axis I28 and tending to turnin clockwisedirection under the influence of springs I29 and I30.
  • the cam I33 is provided with a projection of which the angular development is reduced.
  • a roller I carried at the end of lever I3I rests against this projection and the arrangement is such thatat the moment when the lever I34 is moved, the lever I3I moves away from the frames I23 and I2! which therefore move to a position against lever I 2
  • the frame I26 becomes free to respond to its spring I29, whilst if a symbol code is formed the frame I21 responds tospring I3il.
  • at least one of the levers I2I prevents rotation of these frames.
  • form in fact movable extensions of the code bars I20.
  • a printing telegraph machine for producing a code of a plurality of impulses comprising operating keys divided into two groups respectively, letters and marks; combination bars actuated by said keys, a cam shaft carrying cams, means for starting rotation of said cam shaft by the operation of a key and adapted to stop said shaft after one revolution, sliding members, means actuated by said cams for transferring simultaneously at the beginning of the revolution the sode registcred in said bars to said sliding members for releasing said bars for a further registration, a transmission switch, levers actuated in succession by said cams and controlling said transmission switch depending upon the position of said sliding members, a universal permutation bar displaceable lengthwise to two positions, means actuated by the displacement of said permutation bar to prevent said levers controlling said transmission switch tobe controlled by the position of said sliding members during the revolution of said cam shaft, means to bring said levers back under the control of said sliding members after said revolution of said cam shaft, and means to control said latter means through the receiving and printing part of the machine.
  • a printing telegraph machine having five transmission levers actuated by a cam shaft and controlling a transmission switch whereof the first two levers and the last two levers are divided into two parts and the central one is provided with a hook; an oscillatable member bearing pivot pins adapted to be inserted between the two parts of said first two and said last two levers, respectively, and a hook adapted to engage with said hook of the central lever, said member being adapted to perform a revolution whereby said pivot pins being disengageable from said levers and engageable by said hook of said central lever upon oscillation of said member, a lever carrying said member and oscillatable for returning said pivots to a position between said levers and for disengaging central lever from said hook.
  • a code printing telegraph machine comprising operating keys divided into two groups respectively, letters and marks; combination bars actuated by said keys, a permutation universal bar actuated by said keys and displaceable to two positions dependent upon which group of keys is actuated, sliding members lengthwisely displaceable between two limit positions, and means on said members for transferring said code registered by said bars, said members being ing vertical movement of said members, the said universal permutation bar controlling oscillating movement of said frame.
  • prising operating keys divided into two groups; combination bars actuatable by said keys, sliding members movable in vertical direction and upon which said code is transferable from said bars, elements connected to the receiving and printing parts of the machine, a second frame oscillatable upon a journal between two limit positions, said frame in one of said positions preventing vertical movement of said sliding members, said elements controlling oscillating movesaid code registered by said combination bars, a 15 ment of said frame.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mechanical Control Devices (AREA)
  • Mechanical Operated Clutches (AREA)
  • Printers Characterized By Their Purpose (AREA)
US220682A 1938-05-02 1938-07-22 Start-stop code transmitter Expired - Lifetime US2247162A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
IT2247162X 1938-05-02
GB15358/38A GB514575A (en) 1938-05-02 1938-05-23 Improvements in or relating to type printing telegraphy
DEO23587D DE733244C (de) 1938-05-02 1938-05-24 Ferndrucksender mit Aufspeicherung der Zeichen und selbsttaetiger Umschaltung beim UEbergang des Sendenden auf die andere Typengruppe
CH213687T 1938-06-25
FR839965T 1938-06-29

Publications (1)

Publication Number Publication Date
US2247162A true US2247162A (en) 1941-06-24

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ID=32071274

Family Applications (1)

Application Number Title Priority Date Filing Date
US220682A Expired - Lifetime US2247162A (en) 1938-05-02 1938-07-22 Start-stop code transmitter

Country Status (5)

Country Link
US (1) US2247162A (fr)
CH (1) CH213687A (fr)
DE (1) DE733244C (fr)
FR (1) FR839965A (fr)
GB (1) GB514575A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2431314A (en) * 1941-06-30 1947-11-25 Int Standard Electric Corp Printing telegraph system controlled by vibrations of tuning forks
US2691062A (en) * 1951-10-23 1954-10-05 Teletype Corp Telegraph transmitter
US2754364A (en) * 1951-06-14 1956-07-10 Kleinschmidt Lab Inc Keyboard transmitter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE970439C (de) * 1954-06-05 1958-09-18 Siemens Ag Tastenlocher fuer Fernschreiblochstreifen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2431314A (en) * 1941-06-30 1947-11-25 Int Standard Electric Corp Printing telegraph system controlled by vibrations of tuning forks
US2754364A (en) * 1951-06-14 1956-07-10 Kleinschmidt Lab Inc Keyboard transmitter
US2691062A (en) * 1951-10-23 1954-10-05 Teletype Corp Telegraph transmitter

Also Published As

Publication number Publication date
DE733244C (de) 1943-03-26
GB514575A (en) 1939-11-13
FR839965A (fr) 1939-04-17
CH213687A (fr) 1941-02-28

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