US2593489A - Printing telegraph receiver - Google Patents

Printing telegraph receiver Download PDF

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Publication number
US2593489A
US2593489A US37378A US3737848A US2593489A US 2593489 A US2593489 A US 2593489A US 37378 A US37378 A US 37378A US 3737848 A US3737848 A US 3737848A US 2593489 A US2593489 A US 2593489A
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US
United States
Prior art keywords
frame
armature
storage
storage members
lever
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
US37378A
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English (en)
Inventor
Salmon Reginald Dennis
Turner Frederick James Leslie
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.)
Creed and Co Ltd
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Creed and Co Ltd
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 Creed and Co Ltd filed Critical Creed and Co Ltd
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Publication of US2593489A publication Critical patent/US2593489A/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L13/00—Details of the apparatus or circuits covered by groups H04L15/00 or H04L17/00
    • H04L13/18—Details of the apparatus or circuits covered by groups H04L15/00 or H04L17/00 of receivers

Definitions

  • This invention relates to printing telegraph receivers and more particularly to receivers in which storage members are set in accordance with the code elements of the received signal combination and in which the storage members are afterwards caused to act upon translator mechanism whereby a letter or character is printed, or such other function is performed by the machine, as corresponds to the particular signal combination received.
  • the present invention relates to the selecting 'and'storage mechanism only.
  • British Patent Specification No. 600,297 it is explained that the degree of tolerance for distorted signals which a printing telegraph receiver can develop depends largely on the moment of inertia of certain moving parts one of which is the armature of the receiving magnet.
  • the armature normally occupies one cf two positions, usually referred to as mark and space and is retained in either one or other position according as to whether the current condition in the winding of the magnet represents a mark or a space signal element.
  • Printing telegraph systems usually involve the use'jof; a code in which each character or function 'is re'presented by a fixed number of siglimpulses, commonlyfive, each of which may amark or-a space.
  • the indications have to be transferred to the translator mechanism after which the frame carrying the storage members has to be restored to its original position, and the storage members reset to normal before the first storage member can be presented to the armature for the reception of the first element of the next signal.
  • the object of the present invention is to provide improved means for setting the storage members in accordance with the received signal elements which will avoid the necessity of traversing the storage members while yet permitting the use of an armature member of minimum size, and to enable the maximum possible overlap in the timing of the several operations to be obtained.
  • the storage members may be of the same general design as those disclosed in the abovementioned application, but they are not mounted in a traversing frame.
  • a signal selector and storage mechanism for a printing telegraph receiver in which a striking member is caused to set a plurality of storage members one at a time, each such member being selectively set in accordance with the position of an armature member carrying said striking member, is characterised in this, that the striking member is of dimension no larger than would be necessary'to coact with one storage member only but is caused to coact with each storage member in turn by acting upon an intermediate member spanning the positions of all the said storage members, and that means is provided for causing said intermediate member to act selectively upon said storage member in turn.
  • This intermediate member may consist of a light frame pivotally mounted on a fixed rod and able the spring l2; against a cam carried on the selector shaft i3.
  • the striker lever 8 is operated by the camwhile the arm 5 is held locked by the chopper lever I9 and the striker I is struck outwards through the slot in the turned over end 6 of arm 5, being immediately afterwards withdrawn to its normal position by the action of spring
  • the purpose of the chopper lever l9 (Fig. 1) is to ensure that the striker I is held correctly in the position corresponding to the last signal element received until the indication has been transferred to a storage member in a manner which. will now be described.
  • Lever 34 is mounted on a fixed pivot 36 and its other end 31 is held against a cam mounted on the selector shaft
  • the shape of the cam co-operating with the end 31 of lever 34 is such that as the shaft
  • spring acts in opposition to spring 38. The tensions of these springs are so adjusted that spring 35 is not powerful enough to withdraw the end 31 of lever 34 from contact with the cam on selector shaft I3.
  • the light frame 21 is traversed in one direction by the action of spring 38 and in the return direction by,
  • of frame 21 is so positioned that it is directly opposite the end of the striker I when the armature of the receiving magnet is in one of its two operative positions and if the striker lever 8 is operated while the striker is in this position the lower edge 4
  • Frame 2! is restored to its normal po: sition immediately after each occasion upon which it is actuated by the striker by spring 43 acting on a restoring member 44 rotatably mounted on rod 28 at 45.
  • the limit of travel of frame 21 as it returns to its normal position is determined by'a fixed/bar 46.
  • Shaft 48 is actuated by means of a member 5
  • end 53 is raised, the five storage members 25 are moved towards the bell cranks 49 and the long arm 42 of each storage member engages either the upper or the lower of the corresponding pair of bell cranks 49 thus moving the associated vertical rod 50 into its limiting upper position or into its limiting lower position.
  • is actuatedby the cam on the translator shaft 48 and the arm 41, carrying the pin 26 on which the storage members are mounted, is brought back to its normal position.
  • a frame 55 is rotatably mounted on shaft 48 and has an arm 56 which continuously follows a cam on the translator shaft 52 in consequence of the tension of spring 5?.
  • a cam on the shaft 52 moves the arm 56 of frame 55 and rotates the frame 55 through a limited angle in a direction away from the frame 21.
  • Frame 55 is thereby pressed against the lower extendin arms of the storage members 25 and any such members which were in the operated position, i. 'e., with their long arms depressed, are restored to their normal po-- sit-ions ready to be set by the next stroke of the striker I acting through projection 39 as has al ready been described.
  • the striking frame 21 may be traversed back to its initial position, this movement taking place at tre same time as the assembly of storage members is being rocked forward to transfer the stored signal to the vertical rods 59.
  • Fig. 3 is a diagram which shows the contours and timing of the various cams and the operation of the mechanism described above can be readily understood by following the movements of the various parts.
  • line A shows two complete received five element code combinations. eachpreceded by a start element (space) V and fol-- lowed with a stop element (mark).
  • the first complete signal is represented by a start element (15 milliseconds) followed by mark, space, mark, space, mark each of about 15 milliseconds duration, and a stop element (shown as about 7 milliseconds).
  • Line B" shows the cam contour operating the 70 c'eiv'er would be stopped and, as shown, imme-, diately restarted by the next start element the folarmature resetting lever I4 which operates six times for each signal combination.
  • the armature is held against the magnet after the stop element (mark) until the nextstart ele ment (space) releases it, whereupon it starts up the receiving mechanism.
  • the resetting lever I4 is released, as stated above, While the element is still being received and the armature 2 is then either held against the magnet l or released according as to whether the magnet is energised or not.
  • the chopper lever I9 is operated by the cam contour shown in line C of the figure. This lever 19 locks the cam carrying the striker l in the position corresponding to the signal being received while the cam contour shown in line D operates to drive the striker forward and, as described above, to set the appropriate storage member 25.
  • Line E of Fig. 3 shows the contour of the camfwhich traverses the light frame 21 (Fig. 2) which transfers the indications given by the striker I to the appropriate storage members 25.
  • the return traversing movement commences at the end of the fifth movement of the striker I and is completed during the next following start element when the cam shaft I3 is again in rotation'after' its pause.
  • Line F shows the cam on the selector shaft l3 which operates the clutch (not shown) to start the rotation of the translator shaft 52, which operation, as can be seen, takes place during the receipt of the fourth signal element.
  • This shaft 52 carries the transfer cam indicated in line G, which operates to rock the frame 41 carrying the storage members 25 to transfer the stored signal combination to the bell cranks as engaging the five vertical rods 50, known as code bars which form the first part of the translator mechanism, which transfer operation. has been described above.
  • the transfer cam carried on shaft 52 operates approximately during the receipt of the stop element and immediately after the storage members 25 have set the code they are returned to their normal position whereupon said cam shown in line H operates to restore to their normal. position any of the storage members which have been depressed.
  • a signal selector and storage mechanism for a printing telegraph receiver comprising a signal receiving electromagnet having a cooperating armature adapted to have two selective positions as determined by the successive code elements of a received signal, mechanical means for cyclically moving said armature from one of "said positions to the other, said means operating independent of a received signal, a plurality of storage members, one for each code element, each adapted to be set in response to a received signal code element, striking means, intermediate means disposed between said storage members and said striking means, said striking means adapted to selectively urge said intermediate means against said storage members under control of said mechanical means and said armature and means for traversing said intermediate means with respect to said storage members, said intermediate means adapted to act selectively upon said storage members in turn in response to received signal code elements.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Warehouses Or Storage Devices (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US37378A 1947-07-25 1948-07-07 Printing telegraph receiver Expired - Lifetime US2593489A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB20087/47A GB637673A (en) 1947-07-25 1947-07-25 Improvements in or relating to printing telegraph receivers

Publications (1)

Publication Number Publication Date
US2593489A true US2593489A (en) 1952-04-22

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Application Number Title Priority Date Filing Date
US37378A Expired - Lifetime US2593489A (en) 1947-07-25 1948-07-07 Printing telegraph receiver

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US (1) US2593489A (d)
BE (1) BE483972A (d)
FR (1) FR969508A (d)
GB (1) GB637673A (d)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE977668C (de) * 1951-10-31 1968-03-14 Scm Corp Mechanische Empfangswaehleinrichtung fuer Fernschreibmaschinen

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1932932A (en) * 1933-06-02 1933-10-31 Creed & Co Ltd Start-stop telegraph system and apparatus therefor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1932932A (en) * 1933-06-02 1933-10-31 Creed & Co Ltd Start-stop telegraph system and apparatus therefor

Also Published As

Publication number Publication date
BE483972A (d)
GB637673A (en) 1950-05-24
FR969508A (fr) 1950-12-21

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