US2346944A - Printing telegraph apparatus - Google Patents

Printing telegraph apparatus Download PDF

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Publication number
US2346944A
US2346944A US498190A US49819043A US2346944A US 2346944 A US2346944 A US 2346944A US 498190 A US498190 A US 498190A US 49819043 A US49819043 A US 49819043A US 2346944 A US2346944 A US 2346944A
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United States
Prior art keywords
bar
selector
bars
function
combination
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Expired - Lifetime
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US498190A
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English (en)
Inventor
Salmon Reginald Dennis
Kirchel Alan Arthur
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Creed and Co Ltd
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Creed and Co Ltd
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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
    • H04L17/24—Apparatus or circuits at the receiving end using mechanical translation and type-head printing, e.g. type-wheel, type-cylinder
    • 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

Definitions

  • This invention relates to printing telegraph receivers and more particularly to .the mechanism for selecting a function to be performed, as distinct from selecting a character to be printed.
  • the selection of a function is commonly performed by means of combination members, set in accordance with the received signal elements, which allow a spring actuated selector member to move towards the combination members, e. g.- into a series of aligned slots in such members.- It has hitherto been usual to provide that the selector member, in moving towards the combination members, positioned an interposing memher in the path of a bail or other cam operated member and it was thus necessary for the selec tor member to remain in its forward position until the performance of the function was definitely determined. The selector member must then be withdrawn from contact with the combination members in order to allow of th combination member being set in accordance with the elements of the next signal. The time allowed for this sequence of operations i limited, and the movements of the selector members into and out of selected position must therefore take place with great rapidity. This is a source of noise and wear in operation,
  • a printing telegraph receiver in which a selector member is allowed to be moved by a spring in one direction to select a function to be performed and is moved in the other direction to initiate the performance of the selected function.
  • the movements of the selector members can be less rapid and therefore less noisy, since the time allotted to both movements can include a large fraction of the time formerly taken by themovement of the cam operated member.
  • a selector bar for each-function which is allowed to move in one direction and then positively moved in the other direction carrying with it in this last mentioned movement a secondary bar which initiates the performance of the function.
  • the selector bar is only allowed to move in the first direction when the function is selected for performance, but since the functions of printing and letter spacing are required in the great majority of selections. the selector bars for these functions are moved invariably and invariably carry with them their corresponding secondary bars in the other direction. In th few cases in which printing or letter spacing is not be performed, this is because some other function has been selected and means is provided therefore for causing the selection of. this last mentioned function to arrest the movement of the secondary bar for the printing. and/or letter spacing function before it has.
  • Fig. 1 is an expanded perspective view of the Fig. 4 showsthe function mechanism by which the release and arrest of a reperforator is controlled.
  • I, 2, 3, 4, and 5 denote combination bars which are set in accordance with received signal elements by means of levers BI and cams 52 in the manner described in British Patent No. 482,048. Pivoted to the left hand ends of these bars are levers I00, each formed with a forked member embracing a rod 4
  • a cam IIlI acts on a bellcrank lever 43 tocause a hammer 56 on each of the levers I00 to" strike one or other of two horizontal portions of detent levers I H or H2 (parts only of which are shown) controlling the release of a disc as' described in United States Patent No.
  • the type wheel I02 is in the form of atype cylinder which is selectively rotated and moved longitudinally by means of two mechanical aggregate motion systems as described in- British Patent No. 441,090, although differing from the latter in that the two aggregate motion systems are, as stated above, sun and planet gear systems.
  • the type cylinder I02 is carried in a frame I 03 which is moved parallel to a paper platen- IM by means of a pinion I engaging a rack I05.
  • the pinion I05 is rotated one tooth at a time by a worm gear I01 on the same shaft which is rotated by a worm I 08 through a friction clutch (not shown) but is normally held stationary until released for one revolution.
  • the frame I03 is moved to bring the typecylinder I 02 against the platen I'M for printing by the action of a printing cam I09 driven through a friction clutch but normally'held stationary'.
  • the printing mechanism is generally similar to that described in British Patent No. 441,090 and is also similar thereto in that the movement of the type cylinder axially in accordance with figure shift or letter shift signals is performed by an' additional element (sun and planet in the case considered) of one of the aggreate motion systems.
  • the letter spacing is, however, not carried out as described in British Patent No. 441,090 but in a manner that will presently appear.
  • a plurality of selector members 6', I, 8, 9 (Fig. 1), I0, II (Figs. 2 and 3), I2, I3 (Fig. 3), and I l, I5 (Fig. 4) is provided, one for each function to be performed. These members differ from one another in the arrangement of projections thereunder.
  • the selector bars I0 and II, allotted to the letter spacing and printing functions, are not provided with any projections thereunder.
  • the other selector bars are provided with projections thereunder which co-act with notches in the combination bars I 5 and in additional combination bars 25 and 25.
  • the selector bar 9 for example, is for the figure shift function and is provided with projections which co-act with notches in the combination bars I 5 and the same applies to selector bar I, which is allotted to the all negative signal.
  • the selector bar 6 which may be regarded as a typical selector bar for a function to be selected after all the bars I 5 and 25 and 26 have been set has projections co-acting with notches in all these bars.
  • Each selector'bar '6 I5 is urged to the right by a spring such as B) and its right hand end rests against a common bail 20.
  • a spring such as B
  • the bail 20 is moved to the right by a cam III
  • Selector bars I0 and II ar drawn to the right by their springs and any other selector bar that finds notches in the combination bars so aligned as to allow the projections thereunder to pass through a series of aligned notches is also drawn to the right.
  • Each selector bar 6 II and I4 and I5 is provided with a pawl 6a Ila and Ma, I5a pivoted to the selector bar and having two arms. These arms areheld one upright and one horizontal, by a spring 6b IIb and I012, I511. At the end of the horizontal arm of each pawl is a toothBc. H0 and I40, I5c.
  • I5c rides past a tooth 501.. H03 and I 411, I5d on a corresponding secondary bar 0e He and. Me, I5e.
  • the bail 20 is then returnedtothe left by cam I I0 and positively moves the selected selector bar to the left.
  • Each of the selector bars 6 I5 (except bars I0 and II) is provided with an upright projection 6h 9b and I2h I5h. This projection co-acts with two horizontal bars 2
  • a selector bar such as '6 is moved to the right the projection such as 6h thereon moves both bars 2I and 22- in an anti-clockwise direction.
  • .- suppresses the printing f-unction
  • the bar 22 suppresses the spacing function when so moved as will presently appear.
  • Selector bar I I is the bar for the printing function and selector bar I0 that for the letter space function accompanying printing.
  • bars I0 and II are always drawn to the right, carryingwith them pawls Ifla and Ha.
  • the upright arm of pawl Ila is high enough to co-act with bars 2I (bar 22 being cut away opposite said arm), as well as with a fixed bar 23 beneath the bars 2I and 22,,whi1st the up right arm of pawl [0a co-acts with the bar 22 only, bar 2
  • Secondary bar IIe engages bell crank lever 32- which in turn rotates bell crank lever 52- clockwise and releases for ro tation for one revolution a detent cam 53 and printing cam I09; The latter reciprocates the type wheel I02 against and away from platen I04.
  • Bail 20 moves to the leftbeyond its normal position and as selector bars I0 and II reach the end of their travel the upright arms of pawls I01; and Ma engage the fixed bar 23 and disengage the teeth I0c and lie from the teeth Ind and IId respectively and the secondary bars We and lie are returned to their normal positions by their respective springs. Bail 20 moves back to its normal position and selector bars 10 and II follow it.
  • will have been moved in an anti-clockwise rotation and will engage the vertical arm of pawl Ila to rotate the pawl clockwise and prevent the tooth l lc engaging the tooth ll d on the secondary bar He.
  • the secondary bar He will therefore not be carried to the left with the return movement of the bar H.
  • is cut with a notch opposite the upright arm of pawl Illa so that movement of bar 2
  • bar 22 will have been moved counterclockwise and will act on pawl lta to prevent movement of secondary bar we in the same manner as described above for the action of bar 2
  • Selector bar 9 is for the figure shift function and is selected by a series of aligned notches in the combination bars I 5. When bail 20 moves to the right therefore selector bar 9 can only follow it when allowed to do so by the combination set up on the bars 9 5.
  • the projection 9h on selector bar 9 is of such height as to move both bars 2! and 22 anti-clockwise when selector bar 8 moves to the right and so suppresses both printing and letter spacing functions.
  • the secondary bar 96 associated with selector bar 9 is provided with a downward projection 92' at its right-hand end, which engages with one arm of a three arme'd lever 40. Another arm of lever 40 is engaged by a similar downward projection 81 on the secondary bar 8e associated with the selector bar 8 for the letter shift signal.
  • a third arm of the lever 49 engages between two uprights on a combination bar 25 arranged parallel to the combination bars I 5.
  • the bar 25 is furnished, like bars I 5,
  • the bars I 5 and 25 are shown in Fig. 1 in their extreme left hand positions. These bars are formed with notches which co-act with projections on the underside of'the selector bars (except H! and H) to allow of a certain selector bar being selected when the notches are in alignment with the projections. No attempt has been made in the drawings to show any particular arrangement of notches which will be in alignment for any particular code selection, the bars I 5 being shown in position for the allnegative selection and the notches therein being shown aligned for the projections on all the selector bars 6 9 and I2 l5. It will, however, be clear to anyone skilled in the art. how the notches and projections are arranged since such arrangement iswell known. It is clear that the bar 25 acts to select certain function selector bars which are only to be selected in the figure shift position.
  • a seventh combination bar 25 is provided, normally urged in one direction by a spring El.
  • the selector bar l is provided for the all negative signal, and when bail 20 moves to the right, this selector bar also moves to the right if selected by the setting of combination bars I 5.
  • the pawl la carries the secondary bar 1e to the left and a vertical projection 58 thereon engages one arm of a two-armed bell crank lever 59 and rotates it counter clockwise.
  • the other arm of lever 59 en ages combination bar 26 and moves it to the left against its spring 51.
  • a pawl 60 mounted on a fixed portion of the machine has a tooth 6
  • pawl 60 is rotated counter clockwise and the tooth 6
  • bail 20 moves back to the left it allows pawl 60 to be rotated clockwise by its spring 63 and to come into position to engage the tooth 62 and when secondary bar He is released it is prevented from returning to normal position.
  • the secondary bar l'e holds combination bar 26 in set position.
  • the combination bar 2'6 then permits certain selector bars to move to the right following the next signal combination.
  • Any selector bar associated with a function requiring the all negative signal is provided with a depending projection adapted to engage with the combination bar 26 in its unset position but to pass through a notch therein when itis held in set position.
  • Combination bar 25 is, however, held by the new selector bar having entered a notch therein, but when ball 2% moves to the left to initiate the required function, combination bar 25-is returned by spring 5'! to normal position.
  • Reciprocal functions Functions which respectively initiate and terminate a particular control may be termed reciprocal functions.
  • Figure shift and letter shift already described fall in this class. Other examples are release and arrest of a reperiorating device. In the case of figure and letter shift the reciprocal action is ensured by an additional combination bar 25.
  • the reciprocal action is accomplished in a similar manner, as far as possible.
  • Selector bars I and [4 (Fig, 4) are allotted to reperforator release and reperforator arrest respectively.
  • the corresponding secondary bars I 5e and Me are provided with upright projections each engaging an arm of a three armed lever 64, the third arm 65 cooperating with a spring (not shown) whereby the lever is held in one or the other of two set positions.
  • a fourth arm 66 is pivoted on the lever 54 and is held against a stop thereon by a spring.
  • a third selector bar I6 is provided and furnished with a projection with which the arm 56 engages.
  • the selector bar I5 has no projections on its underside but is provided with a pawl I60. and a secondary bar I Se in the same way as other selector bars.
  • the selector bar I5 Upon receipt of the reperforator release signal the selector bar I5 is selected and when the bail moves to the right and then back to the left, the pawl l5a moves the secondary bar lie to the left to rotate the three armed lever 64 and so move the arm 66 clear of the projection on the selector bar I6.
  • selector bar I4 When the reperforator arrest signal is received and bail 20 moves to the right the selector bar I4 will be allowed to move to the right, as well as selector bar I6, and when bail 20 move to the left secondary bar Me, as well as secondary bar I59, will move to the left.
  • the three armed lever 64 will be rotated to bring the arm 66 there- 011, against the projection in selector bar I6 and this; selector bar will thus be prevented from moving to the right upon subsequent movement of bail 29.
  • the spacing signal causes the selection of a selector bar I2 which does not carry a pawl and is not provided with a secondary bar. It is, however, provided with an upright projection I271. which i high enough to be opposite bars 2
  • the signal combination for such a character moves the combination bars I 5 and possibly 25 to present a series of aligned notches to a selector bar I3 which does not carry a pawl and is not associated with a secondary bar.
  • the upright projection I371. on the selector bar I3 moves the bar 22 anti-clockwise to engage the pawl Illa on the selector bar III to suppress the letter spacing function, but does not move the bar 2
  • Printing telegraph receiver including a se lector member, spring means for moving said member in one direction for function selection, means for moving said member in the other direction, and means actuated by the latter movement for initiating the performance of the selected function.
  • Printing telegraph receiver comprising a selector member for a function to be performed, a secondary member associated with the selector member, means for moving the selector member in one direction when the corresponding function is selected, means for returning the selector member in the reverse direction, means actuated by the selector member for moving said secondary member with it in the reverse direction and means actuated by the movement of said secondary member in said reverse direction for initiating the performance of said function.
  • Printing telegraph receiver comprising a bail member, means operable after the receipt of each signal to reciprocate said bail member, a plurality of selector members one for each function to be performed in the receiver, spring means for biasing each selector member toward said bail member, means for restraining said selector member against movement toward the bailed member, means for releasing a selected selector member arranged to permit the selected member to be drawn by an individual spring to follow the movement of said bail member in one direction and to be moved by said bail in its movement in the other direction and means operative on movement of the said selector member in the last mentioned direction to initiate the performance of the required function.
  • Printing telegraph receiver as claimed in claim 3 including means for invariably selecting the selector members for the printing function and the letter space function accompanying printing at each reciprocation of said bail, combination bars arranged for selection of selector members for other functions, means effective on the selection of a selector member for one of said other functions to prevent the movement of the selector member for at least one of said printing and letter space functions from being effective in initiating the performance of its corresponding function.
  • Printing telegraph receiver as claimed in claim 3 including a secondary member associated with each of a plurality of selector members and means for causing the selector member when moved in one direction to move with it its associated secondary member and means for causing said last mentioned movement of said secondary member to initiate the performance of a function.
  • Printing telegraph receiver as claimed in claim 2 including a pawl pivoted on a selector member and a cooperating abutment on said secondary member arranged for engagement by the pawl during movement of said secondary member in reverse direction arranged to move said secondary member in said reverse direction.
  • Printing telegraph receiver as claimed in claim 1 comprising combination bars, one for each element of a received signal, means for settin said combination bars in accordance with the respective elements of a signal, selector mem bers lying transversely of said combination bars complementary means on the combination bars and selector members arranged to enable selector members selected by a particular setting of said combination bars to move relatively to said combination bars.
  • Printing telegraph receiver comprising a pinrality of combination bars, one for each element of a received signal, means for setting said combination bars in accordance with the respective elements of such signal, longitudinally movable selector members lying transversely of said combination bars, complementary means on said selector and combination bar arranged to release a selected selector member for longitudinal movement, means for imparting to such released bar an advance and return movement, and means actuated by said released bar duringthe return movement for initiating a function of said receiver.
  • Printing telegraph receiver as claimed in claim 8 in which the complementary means includes notches in said combination bars and projections on said selector members arranged to engage the combination bars and prevent lengthwise movement of the selector bars except when each projection on a selector bar is in alignment with a notch in the adjacent combination bar.
  • Printing telegraph receiver comprising a plurality of combination bars, means for positioning said bars in accordance with the elements of a received signal, a plurality of selector bars, means for moving the selector bars to initiate functions of the receiver controlled by the setting of the combination bars, and means for preventing a selector bar from initiating such function including a member movable into engagement with such selective bar during its movement by said moving means.
  • Printing telegraph receiver as claimed in claim 10 including selector bars for initiating the printing and letter spacing functions respectively, said preventing means including means actuated by another selector bar for selectively preventing the operation of said printing selector bar and letter spacing selector bar respectively.
  • Printing telegraph receiver as claimed in claim 2 including a function actuating member, and means for shifting said member into and out of operation including means actuated by a secondary member for shifting said means into actuating position and means associated with another secondary member for shifting said actuating means out of actuating position.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Printers Characterized By Their Purpose (AREA)
  • Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
US498190A 1942-08-14 1943-08-11 Printing telegraph apparatus Expired - Lifetime US2346944A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB11402/42A GB559466A (en) 1942-08-14 1942-08-14 Improvements in or relating to printing telegraph apparatus

Publications (1)

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US2346944A true US2346944A (en) 1944-04-18

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US498190A Expired - Lifetime US2346944A (en) 1942-08-14 1943-08-11 Printing telegraph apparatus

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US (1) US2346944A (fr)
FR (1) FR933314A (fr)
GB (1) GB559466A (fr)

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Publication number Publication date
GB559466A (en) 1944-02-21
FR933314A (fr) 1948-04-27

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