US2911471A - Receiving system for telegraph signals - Google Patents

Receiving system for telegraph signals Download PDF

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Publication number
US2911471A
US2911471A US632719A US63271957A US2911471A US 2911471 A US2911471 A US 2911471A US 632719 A US632719 A US 632719A US 63271957 A US63271957 A US 63271957A US 2911471 A US2911471 A US 2911471A
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US
United States
Prior art keywords
armature
signal
cam
lever
telegraph
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
Application number
US632719A
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English (en)
Inventor
Augustin Johann
Holstein Otto
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of US2911471A publication Critical patent/US2911471A/en
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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
    • H04L17/16—Apparatus or circuits at the receiving end
    • H04L17/18—Code selection mechanisms

Definitions

  • This invention particularly relates to receiving selector mechanism for telegraph signals of the code combination type in which the telegraph signal elements arrive suc cessively.
  • the change in position of the selecting sword member is determined by the position assumed by the armature at the moment in which the sword member is advanced toward it. If the first telegraph signal element, arriving after the start element, is a no-current or space element then the armature will remain dropped but if this element is of the current-on or mark type, then the armature, in the meantime, has been attracted again, thus causing the first selecting sword member to assume a position corresponding to the current condition of the first code signal element. After this first selecting sword member has again been withdrawn from the armature, the second selecting sword member, after a period of about 50 milliseconds, subsequently to the commencement of rotation of the selector cam barrel, will be advanced toward the extension on the armature of the receiving magnet. Accordingly, this selecting sword member, in the same manner as the first one, will be moved into a defined, predetermined position which, in turn, depends on the position of the armature and, consequently on the no current or current on condition of the second signal element. 7 4
  • the third, fourth and fifth selecting sword members also are moved toward the armature of the receiving magnet and set to their respective positions.
  • the current on stop element which is customary with the .start-stop type.
  • the start element Upon arrival of the new code signal the start element again causes the relapse of the armature of the receiving magnet, and the releasing of the selector cam barrel; in this way there is initiated the repeated process of receiving successive telegraph signal codes.
  • the extension of the armature is not rigidly connected with. the armature, but is hinged to it in a resilient manner. Even when disregarding the extremely complicated construction of such types of receiving systems, it is impossible with them toachieve a substantially greater receiving margin and higher telegraph speeds.
  • the receiver control bush with levers and small levers registers or stores the elements of a signal combination mechanically in a register, e.g. consisting of slides, in such a way that for this registering process there are only required very slight forces and lever movements.
  • the power-consuming setting of the selecting bars, how- 'ever, is taken over and carried out by a cam plate which,
  • the receiver control bush moves the armature control lever at half or at the same speed of rotation as beforewhich depends on the desired printing speed-toward the receiving magnet. In this way there is achieved a quieter operation of the lever arrangement at the smallest lever wear and at an increased printing or telegraph speed.
  • FIG. 1 is a diagrammatic representation of sufficient of the selector mechanism of a teleprinter for a proper understanding of the invention
  • Fig. 2 is a view of the selector cam barrel
  • Fig. 3 illustrates the profiles of two of the cam disks.
  • the reference numeral 14 represents a plurality of displaceable slide members which serve as code element storage means and the number of which corresponds to the number of signal elements in the type of telegraph code used.
  • the slides 14 are urged in one direction by springs 15, and can be latched and unlatched by the action of pawls 11, under the control of levers 6, projecting teeth 8 on which are urged by the associated springs 7 with slight force against the peripheries of cam plates 27 on the selector cam barrel, so that they are capable of engaging in shallow depressions 29, provided that they are not prevented from doing so in this moment by an extension of armature 2.
  • the armature 2 by the action of the teeth 28 of a star-shaped wheel 26 (see Figs. 2 and 3), is in known manner moved at a predetermined time position toward the magnet 1.
  • the armature 2 of the receiving magnet 1 is pivoted at point 3 and, at its front end 4, is provided with a detent 5, which when used with the standard five-unit code cooperates with five three-armed levers 6.
  • a spring 9 By the action of a spring 9 the armature 2 is removed from the receiving magnet whenever this magnet is de-energized.
  • the arms 10 of the five levers 6 are pressed with their teeth 8 against the edges of five cam disks 27 on the cam barrel and thereby actuate the pawls 11, which are pivoted at point 12, and the ends 13 of which cooperate with the five side members 14 for storing a signal combination.
  • the slide members 14 are provided with depending projections 16 which abut against an arm of a lever 17, which is pivoted at point 18, and, in conjunction with a roller 35, is acted upon by a cam disk 20.
  • the cam disk 20 takes over the power setting of the selecting bars under the control of the slide members 14 by actuating a lever 21, which is pivoted at point 22, and the end 23 of which is provided with the five T-shaped members 24, adapted to coact with the five slide members 14 of the storage means. It will be noted that all the levers involved in the control process only perform slight movements during the latching and the unlatching operations.
  • the selector cam barrel (Figs. 2 and 3) carries a single star wheel 26 provided with teeth 28 (Figs. 2 and 3b) for actuating the armature 2 in the manner described heretobefore.
  • the cam barrel five cam disks 27 which are provided with diametrically disposed shallow depressions 29 and'29' (Figs. 2 and 3a) for causing the actuation of the levers 6 and two limiting stop arms 25.
  • the cam barrel is driven through a friction clutch and is arrested after each cycle of operation by a stop arm 25.
  • Such arrangements' are well-known and are described, for example, in US.
  • the cam disks 27 are arranged on the cam barrel shaft in such manner that the depressions 29 and 29' on each half their circumference are staggered by a suitable amount with respect to one another.
  • the cam barrel is capable of controlling the reception of a complete teleprinter code signal in half a rotation, that is, the cam barrel, in response to the start element of this signal, is released for this half rotation by the action of one limiting stop arm 25.
  • the cam barrel is capable of controlling the reception of a complete teleprinter code signal in half a rotation, that is, the cam barrel, in response to the start element of this signal, is released for this half rotation by the action of one limiting stop arm 25.
  • the cam barrel i.e.
  • the mode of operation of the receiving system is as follows:
  • the armature 2 In the normal condition the armature 2 is continuously attracted by the closed-circuit current flowing through coil 1, and the cam barrel is arrested in known manner by the engagement of a limiting stop arm 25 controlled by the armature with a limiting stop on the cam barrel.
  • the armature 2 Under the action of spring 9, will drop off and by withdrawing the stop arm releases the cam barrel to perform half a rotation.
  • the cam barrel then commences to rotate in the direction as indicated by the arrow at such speed that the teeth 28 on the star wheel 26 periodically advance the armature 2, in about the middle of the time positions of the telegraph signal elements following the start element, toward the receiving magnet 1.
  • the armature 2 will remain attracted. However, when the magnet is not energized in this particular time position due to a space condition, then the armature 2 will drop off with its detent edge 5 in front of the right hand of the levers 6 thus latching them. In the case of a mark element the armature 2 via its detent 5 will unlatch the lever 6, and the first lever 6, under the action of spring 7, will perform an instantaneous slight clockwise rotation, because its tooth 8 is now able to engage depression 29 provided at a suitable point on the periphery of the first cam disk 27.
  • the remaining levers 6 are thereby unlatched but do not perform a movement, because they rest on the circumference of their respective cam disks 26.
  • the rotation of the first lever 6 also causes the pawl 11 to rotate slightly in an anti-clockwise direction thereby unlatching the associated slide member 14 which, under the influence of spring 15, moves with its limiting stop 16 to the right.
  • the first mark element of the telegraph signal is fed into the storage means.
  • the armature 2 by the action of the next tooth 28 of the star wheel 27, is again moved toward the receiving magnet. If in this case the signal element is a no current one, the armature 2 will drop off and will latch the levers 6 by means of its detent 5.
  • the selecting elements 38 are correspond ingly displaced to actuate printing or perforating mechanism of any suitable and known type.
  • this lever 21 is returned to normal by the action of spring 33.
  • a further tooth 34 engages the roller 35 on a lever 17, which performs an anti-clockwise rotation.
  • the end of one arm of the lever 17 engages the depending projections 16 of the slide members 14, which are moved toward the left and latched again by the pawls 11 in their normal positions.
  • the process of restoring the slide members 14, which clears the storage means is terminated prior to the arrival of the first element of the next tele graph code signal. Hence the storage means is ready again to register the next, immediately following telegraph cotle signal.
  • Selector mechanism for telegraph receiving apparatus comprising a rotatable selector cam barrel, a receiving magnet, an armature for said magnet, a plurality of slide members, first lever means which under the control of said cam barrel and responsive to the attracted or relapsed condition of said receiving magnet armature is arranged to successively set said slide members according to the nature of the respective signal elements of a received character code, an individual exploring member for each slide member, selector means individual to each said exploring member and controlled by the movement thereof, a rotatable cam disk, and second lever means associated with said cam disk and said exploring members for simultaneously actuating said exploring members to explore the setting of all said slide members and thereby actuate said selector means during one operative cycle of said cam disk.
  • said first lever means comprises a plurality of levers one for each signal element and provided with projecting teeth
  • said selector cam barrel comprises an equal plurality of selector cam disks formed around their peripheries with shallow depressions, light spring means being provided for urging said projecting teeth on said levers against the peripheries of the respective selector cam disks.
  • each of said selector cam disks is provided on its periphhery with a pair of diametrically opposite shallow depressions whereby a code receiving cycle is performed during half a rotation of said cam barrel.
  • Selector mechanism further comprising third lever means in cooperative relation with said rotatable cam disk and said slide members and arranged to restore the latter simultaneously to their normal position after said selector means has been actuated responsive to a received character code.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmission Devices (AREA)
  • Moving Of Heads (AREA)
US632719A 1956-01-07 1957-01-07 Receiving system for telegraph signals Expired - Lifetime US2911471A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL23798A DE1036309B (de) 1956-01-07 1956-01-07 Empfangssystem fuer Telegrafierzeichen

Publications (1)

Publication Number Publication Date
US2911471A true US2911471A (en) 1959-11-03

Family

ID=7262858

Family Applications (1)

Application Number Title Priority Date Filing Date
US632719A Expired - Lifetime US2911471A (en) 1956-01-07 1957-01-07 Receiving system for telegraph signals

Country Status (3)

Country Link
US (1) US2911471A (de)
CH (1) CH348983A (de)
DE (1) DE1036309B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2979564A (en) * 1956-09-05 1961-04-11 Commercial Controls Corp Code-form converter and communication system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT135224B (de) * 1931-06-26 1933-11-10 Creed & Co Ltd Auswählmechanismus für Telegraphen-Empfänger.
AT136640B (de) * 1932-07-08 1934-02-26 Creed & Co Ltd Auswählmechanismus für Typendrucktelegraphenempfänger.
BE476866A (de) * 1945-10-23
NL83424C (de) * 1949-03-19
DE936876C (de) * 1953-05-05 1955-12-22 Lorenz C Ag Einrichtung zum Empfangen und Auswerten von Telegrafierzeichen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
DE1036309B (de) 1958-08-14
CH348983A (de) 1960-09-30

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