US3472955A - Telegraph apparatus having intermediate storage capability - Google Patents

Telegraph apparatus having intermediate storage capability Download PDF

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Publication number
US3472955A
US3472955A US609852A US3472955DA US3472955A US 3472955 A US3472955 A US 3472955A US 609852 A US609852 A US 609852A US 3472955D A US3472955D A US 3472955DA US 3472955 A US3472955 A US 3472955A
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United States
Prior art keywords
transmission
code
signal element
signal
lever
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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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US609852A
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English (en)
Inventor
Heinz Deimling
Erich Lutz
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International Standard Electric Corp
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International Standard Electric Corp
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Publication date
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
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Publication of US3472955A publication Critical patent/US3472955A/en
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    • 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
    • H04L13/02—Details not particular to receiver or transmitter
    • H04L13/08—Intermediate storage means

Definitions

  • the present invention relates to key-controlled transmitters operating on the start-stop principle, for use in connection with printing telegraph apparatus (teleprinters), or the like, comprising an arrangement by which there is permitted momentarily an input rhythm which is in excess of the transmission rhythm.
  • the transmitter is capable of absorbing or intercepting the momentarily appearing typing peaks, normally involving two characters, by a type of intermediate storage.
  • this is accomplished in a simple manner in that the keyboard locking which is effective during the transmission of a keyed-in character, is eliminated upon transmission of the penultimate signal element, and in this way the mechanically, electromechanically, or electronically preset condition of the last signal element is maintained for the period of time required for the transmission of this last signal element. This is also the case in an intermediate storing-in of a new code combination.
  • FIGS. 1, la, and 2, 2a show, in schematical representation restricted to the most essential parts, that particular portion of the transmitter associated with the last signal element of a multicontact transmitter of a known type, being mechanically influenced by the key-controlled code bars.
  • FIGS. 1, 1a, and 2, 2a The transmitting arrangement shown in FIGS. 1, 1a, and 2, 2a, provides, for each signal element according to the representation, a transmitting contact 1, a sensing lever 2, and a controlling cam plate 3 which together constitute the transmitting cam shaft which is driven by the transmitter shaft 4.
  • this includes a control cam (not shown) for producing the synchronizing pulses commonly referred to as the start-stop elements.
  • the transmitting cam shaft comprises a further, cam plate (not shown) for effecting control of the keyboard locking in conformity with the cycles.
  • this consists of a holding bar 5 arranged transversely over the code bars 8, and by which the code bars 8 are retained in the one or the other final position, by engagement to the grooves 8a, for a predetermined period of time in the assumed position.
  • this period of locking or holding usually lasted from the end of the start element to the beginning of the stop element.
  • the setting of pull levers 7 (operating levers) as actuated by the code bars 8 was maintained in the intended position during the time of transmission of the signal elements. During this time, therefore, it was impossible to reactuate the keys, so that in any case the complete transmission of a signal combination was required, before the keyboard could be released for a new keying-in.
  • the pull lever 7 associated with the last signal element consists of an upper operating lever portion 7a and a lower fork part 7b, which are both pivoted on shaft 6 common to all of the operating levers 7.
  • the two lever portions 7a. and 7b are connected to one another by a spring 70, so that in the normal condition, they will assume the stretched-out position as illustrated in FIGS. 1, 2, and 2a.
  • the cam plate (not shown) associated with the holding bar 5 is designed in such a way that the blocking of the keyboard is already eliminated immediately after the transmission of the penultimate signal element.
  • the fork portion 7b of pull lever 7 under the action of the spring 70, is swivelled with respect to the upper operating lever portion 7a which is retained by the sensing lever 2.
  • the tension of the spring 70 is chosen so that it will neither have an influence upon the engaging position between the levers 2 and 7a, nor will it be capable of retracting the code bar 8 out of the newly set position.
  • the keyboard is again locked by the holding bar 5 in the manner as already described hereinbefore until the transmission of penultimate signal element is effected. If, within the stroke of an immediately following new keying-in, there is again effected a resetting or displacement of the code bar 8 according to FIG. 2a as associated with the last signal element then, in this particular case, the operating lever portion 7a with its snug 7d is placed against the snug 2a of the sensing lever 2 which has already engaged at this time position. Only if the latter, after the completed transmission of the last signal element, is lifted out again by the cam plate 3, the operating lever portion 7a is permitted to assume the position corresponding to the newly keyed-in character (signal element).
  • this relay In the case of transmitters employing preliminary contacts which are set directly by the code bars, and which are interrogated with the aid of a transmission distributor, the idea of the invention may be employed in such a way that the code bar associated with the last signal element, and via the preliminary contact associated therewith is aimed at controlling a relay.
  • the switching circuit of this relay is so designed that this circuit, by a corresponding contact control on the part of the transmission distributor is interrupted each time during the transmission period of the last signal element until to the end of the stop element as a maximum.
  • this relay comprises a hold circuit which is each time momentarily interrupted at the beginning of each cycle of the transmission distributor, i.e. during the start element. In the course of this, a further delay contact takes over the function of the preliminary contact to be controlled.
  • the idea of the present invention may also be applied to transmitters having a purely electronic mode of operation, and in which the individual signal conditions are keyed into storage stages.
  • a two-stage shift register which is being stepped on each time during the start element or, at the latest, at the end of the transmission of the penultimate signal element.
  • An improved key-controlled telegraph transmitter arrangement operating on the start-stop principle, in which there is momentarily permitted an input rhythm which is higher than the transmission rate, and in which each code element of an actuated key is established for transmission by the position assumed by a respective code bar (8), in response to said actuation, and by the subsequent sensing of that position by a respective sensing lever (2), wherein the improvement comprises a pull lever (7), in operative arrangement with the sensing lever (2), associated with the last signal code element, and coupled to the corresponding code bar (8), said pull lever (7), in response to a premature following input code signal and elimination of the keyboard locking subsequent to the transmission of the penultimate code element of the preceding signal, providing for an intermediate storage of the corresponding code element of the premature following signal while simultaneously retaining the code element of the preceding signal until that element is transmitted.
  • said pull lever (7) is comprised of an upper operating lever portion (7a) and a lower fork portion (7b), said upper operating lever portion (7a) having a snug (7d) at the free end thereof designed to interact with the snug end (2a) of sensing lever (2). 45 3.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Input From Keyboards Or The Like (AREA)
US609852A 1966-02-08 1967-01-17 Telegraph apparatus having intermediate storage capability Expired - Lifetime US3472955A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEST24962A DE1278480B (de) 1966-02-08 1966-02-08 Verfahren und Anordnung zum Ermoeglichen eines gegenueber dem Sendetakt kurzzeitig hoeheren Eingabetaktes bei tastaturgesteuerten Fernschreibmaschinen

Publications (1)

Publication Number Publication Date
US3472955A true US3472955A (en) 1969-10-14

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Family Applications (1)

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US609852A Expired - Lifetime US3472955A (en) 1966-02-08 1967-01-17 Telegraph apparatus having intermediate storage capability

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US (1) US3472955A (en])
BE (1) BE693774A (en])
CH (1) CH460081A (en])
DE (1) DE1278480B (en])
NL (1) NL6701934A (en])

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1367735A (en) * 1921-02-08 Amos f
US1902943A (en) * 1931-05-01 1933-03-28 Int Communications Lab Inc Keyboard transmitter
US1915280A (en) * 1931-08-06 1933-06-27 Int Communications Lab Inc Single contact keyboard transmitter
US2336197A (en) * 1940-09-17 1943-12-07 Rca Corp Signal storage in telegraph printer systems
US2623118A (en) * 1948-10-08 1952-12-23 Creed & Co Ltd Keyboard controlled telegraph apparatus
US2678965A (en) * 1953-01-29 1954-05-18 American Mach & Foundry Magnetic memory circuits

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1367735A (en) * 1921-02-08 Amos f
US1902943A (en) * 1931-05-01 1933-03-28 Int Communications Lab Inc Keyboard transmitter
US1915280A (en) * 1931-08-06 1933-06-27 Int Communications Lab Inc Single contact keyboard transmitter
US2336197A (en) * 1940-09-17 1943-12-07 Rca Corp Signal storage in telegraph printer systems
US2623118A (en) * 1948-10-08 1952-12-23 Creed & Co Ltd Keyboard controlled telegraph apparatus
US2678965A (en) * 1953-01-29 1954-05-18 American Mach & Foundry Magnetic memory circuits

Also Published As

Publication number Publication date
CH460081A (de) 1968-07-31
NL6701934A (en]) 1967-08-09
DE1278480B (de) 1968-09-26
BE693774A (en]) 1967-08-08

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