US2215802A - Transmitter for step-by-step telegraph systems - Google Patents

Transmitter for step-by-step telegraph systems Download PDF

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Publication number
US2215802A
US2215802A US182201A US18220137A US2215802A US 2215802 A US2215802 A US 2215802A US 182201 A US182201 A US 182201A US 18220137 A US18220137 A US 18220137A US 2215802 A US2215802 A US 2215802A
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US
United States
Prior art keywords
lever
shaft
key
transmitter
depressed
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
US182201A
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English (en)
Inventor
Thompson Alfred Edward
Salmon Reginald Dennis
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
Original Assignee
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
Application granted granted Critical
Publication of US2215802A publication Critical patent/US2215802A/en
Anticipated expiration legal-status Critical
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
    • H04L19/00—Apparatus or local circuits for step-by-step systems
    • 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

Definitions

  • This invention relatesto transmitters for stepby-step type printing telegraph apparatus, and has for its object to provide such a transmitter that will be cheap to construct, that" requires 5 for signalling purposes two line conditions only,
  • l transmitting contacts are operated by means of a shaft that sends only two or four impulses per revolution of the shaft.
  • a keyboard to be used for controlling the transmission of the signals, having 15 the keys arranged in a plurality of rows as in a teleprinter or typewriter.
  • Other features of the invention comprise arrangements for looking a depressed key in depressed position and preventing any other key being depressed until 20 the required number of impulses have been sent; and for preventing the simultaneous depression of two keys.
  • An important feature of the invention is that a delay period occurs between the depression of a key and the commencement of 25 the transmission of impulses since this delay ensures a definite pause between successive series of impulses.
  • Fig. l is a plan view of the apparatus, partly in section and with the keyboard omitted;
  • Fig. 2 is a side elevation of Fig. 1, looking 35 in the direction of the arrow X, but including the keyboard; i
  • Fig. 6 is a view showing an alter-native mechanism to that of Figs. 4 and 5;
  • Figs. 7, 8 and 9 show details; Figs. ill, 11 and 12 show the mechanism for 4,5 sending out a continuousseries of impulses of long duration for synchronising purposes.
  • the apparatus shown therein is adapted to be driven by means of a manually rotatable handle, but it is to be 50 understood that other driving means, such as an electric motor may be used.
  • the handle I is fixed to a lever 2 clamped around a sleeve 3 fixed to a shaft l.
  • This shaft 4 drives, through the medium of a coiled spring, a shaft 9 which must 55 be kept in continuous rotation whilst the transmitter is operated.
  • the shaft 9 drives the driving portions [2a and it of two toothed clutches, the driven portions of which are normally held stationary. When a key is depressed these clutches are tripped and sleeve 22 and shaft 30 *5 are caused to rotate.
  • Sleeve 22 which is driven at a much higher speed than shaft 30, actuates, by means of cams thereon, the transmitting contacts, whilst shaft 30 rotates until one of a helical series of levers 32 thereon releases the key v that has been depressed, whereupon sleeve 22 and shaft 30 are arrested.
  • a cylindrical drum 1 Upon the shaft 4, driven by means of handle I, or by means of a motor, is fixed a cylindrical drum 1.
  • the shaft 9 is supported in bearings to rotate freely and its axis is in line with the axis of shaft 4.
  • One end of a coiled spring 8 is fastened to the interior of drum 1 and the other end to shaft 9, so that shaft 9 is driven from shaft t by tension applied tothe spring 8.
  • a gear wheel l0 fixed on shaft 9 meshes with gear wheels H and I2.
  • Gear wheel 12 is fixed to the driving portion lila of a toothed clutch.
  • Gear wheel ll is fastened on a stub shaft E3 to which is fastened a gear wheel M which meshes with gear wheel [5 fastened on the driving portion iii of a second toothed clutch.
  • the keys 33 are arranged in three rows as in a teleprinter and are carried by key levers 34 all pivoted on a rod 35, andare held in position by individual springs 63.
  • To each key lever 34 is fixed a pair of parallel plates 36 confining between them a two armed lever 39, Ml, pivoted on the key lever by means of a knuckle joint 31 which permits limited movement only.
  • the levers 39, iii are held in position by springs 38 fixed theretoand to the key levers 34.
  • a lever 45 (Figs. 4 and 5) pivoted to which is a latch 46, which engages with the end of a lever 18 under the action of a spring 41.
  • Lever 48 is shaped as shown in Fig. 8, is pivoted in blocks 49, 50 and carries a detent 5
  • the part 52 is urged towards the driving part In of the clutch by a spring 53 and is slidably mounted on a shaft carrying a cam 54.
  • a lever 68 (Fig. 5) against the end of which rests a lever 6i tending to turn clockwise about its pivot '52 under the influence of a spring 73.
  • lever 48 pushes lever 48 against spring II to disengage detent 5! from the clutch part 52.
  • the parts 5i and 52 of the clutch engage, and cam 54 is driven by the clutch.
  • the cam rotates the latch 46 is disengaged from the lever 48 thus permitting lever 48 to arrest the part 52 after it has completed one revolution.
  • lever 68 allows lever 6
  • Cam 54 after a period of rotation clockwise in Figs. 4 and 5 depresses a lever 55 and a turned over portion 62 of lever M can move over a nose 53 on lever 55 and hold it depressed.
  • a lever 14 is provided normally held by a spring I5 against cam 54 to prevent any anti-clockwise rotation of such cam and to provide a. definite stop position therefor.
  • Lever 55 is, in the stationary position of cam 54, held against that earn, by a spring (not shown) similar to spring I5.
  • a second arm 58 of lever 55 carries a detent 51 which normally holds the driven part I1 of a toothed clutch out of engagement with the driving part I6.
  • this detent On the depression of lever 55 by cam. 54 this detent is raised and the clutch engages.
  • a gear wheel 28 and cams 22, 23, and 15 are thereupon rotated.
  • Cams 22 and 23 act on levers 24 and 25 which carry contacts co-operating with fixed contacts 26, 21 to send reversals to line.
  • Cam I6 00- operates with a lever 11 which holds the cam .shaft in definite position when the clutch parts I6, and I! are disengaged.
  • the speed of the shaft carrying cams 22, 23 and I6 is controlled by a speed governor (not shown).
  • Gear wheel 25 meshes with gear wheel ill on a stub shaft on which is fixed gear wheel 28.
  • the latter meshes with and thus drives a gear wheel 29 on a shaft 38.
  • the latter carries a helical series of projections 32, one for each key lever and an indicating wheel 3!.
  • the shaft 30' is driven at such speed that it turns through the distance between two adjacent characters on the wheel 3
  • FIG. 6 Ain alternative mechanism for holding the lever 55 depressed after it has been once actuated by the cam 54 is shown in Fig. 6.
  • a lever i9 is fixed to rod 52, and pivoted to latch 19 is a lever 88 with a hooked end shaped as shown in Fig. 6.
  • the hooked end of lever 85 rides on a roller BI mounted adjustably on a bell crank lever 82 pivoted at 83.
  • latch moves into the path of the end of lever 55.
  • lever 55 is depressed by cam 54, it is held by latch 80.
  • the hooked end of latch 85 rises thus allowing lever 55 to rise simultaneously.
  • the latch 88 engaging with the roller GE is moved back out of the path of the end of lever 55.
  • the depression of a key does not immediately operate lever 55 but lever 55 is held operated until the key is released.
  • gear wheel 6 is provided on shaft 4 and a gear wheel 85 on shaft I.
  • Gear wheel 85 drives, through an idler gear 86, a gear wheel 87 fixed on a sleeve 88 freely turning on a shaft 9
  • Gear wheel 5 meshes with a gear wheel 89 on a sleeve 90 also freely rotating on shaft 9
  • Carried on sleeves 98 and 88 respectively are gear wheels 92 and 53 which mesh with pinions 94 and 95 carried by a disc 96 secured to shaft 9i.
  • is a gear wheel 91 which, through gears 98, 99 and I00 drives a sleeve IOI freely rotatable on the shaft.
  • Sleeve IUI carries a cam I52 which acts on levers I83 and I84 (Fig. 9).
  • Lever E33 closes contacts I85 to light a warning lamp when cam I 02 has rotated so far in one direction as to indicate that the tension of spring 8 is too low.
  • lever I 04 is moved by cam 552 into engagement with a cam 5 on the sleeve 3 and tends to hold the handle against being turned thus placing an extra load on the operator.
  • a friction clutch may be placed between the motor shaft and shaft 4 and the lever I04 acting on cam 5 will then hold shaft 4 stationary until the tension of spring 8 has fallen. Alternately the -33 and the subsequent stoppage of the apparatus in a definite position.
  • the key lever I06 has pivoted thereto alever 39a, 40a similar to the lever 38, ill pivoted to other key levers, but there is no projection 32 on the shaft 30 corresponding thereto.
  • the depending arm 40a is very slightly longer than the depending arm 40 of the levers pivoted to other key levers.
  • Key lever idii carries a plate I01 which projects over an adjacent character key lever, say for letter T, and thus when the synchronising key is depressed the adjacent key lever is-also depressed.
  • the frame 41 is tilted only by the arm 40a so that when a projection 32 engages the arm 39 of the lever on the key lever for letter T, it has no effect in releasing the keyboard or in stopping the mechanism.
  • ] carries a gear wheel H2 and mounted to be freely rotatable on a shaft parallel to shaft 30 is a gear wheel III], which is formed with a gap III in its teeth. This gap is normally opposite wheel II 2.
  • Key lever IE6 is extended beyond its pivot 35 and pivoted thereto is a horizontal latch H3 engaging with a bell crank lever H4 pivoted at H5.
  • An arm of the bell crank lever H4 engages a detent I" on wheel IIIJ.
  • Fixed to wheel H3 is an arm I09.
  • latch H3 is removed from lever H4 which is pulled by spring H6 out of engagement with detent H1.
  • Spring H3 one end of which is attached to arm I09 pulls this arm and so rotates wheel H until its teeth mesh with those of wheel H2.
  • Wheel I I0 is then rotated, arm I09 being carried round with it and spring H8 tensioned. This rotation continues until the gap III comes nearly into the position shown in Fig. 12. As soon as the gear teeth come out of engagement spring H8 pulls arm I09 to rotate wheel H0 suddenly into the position shown in Fig. 12. In this last part of the movement arm I09 gives a sudden blow to a bell crank lever I I9 and turns it into contact with the arm 39a of the lever pivoted to key lever I36 and so moves the depending arm iila from engagement with the frame II. The frame 4! rises until it engages with the depending arm 43 ofthe lever pivoted to the key lever for letter T. The control of the transmitter is now with the latter and when the shaft 3
  • a step by step receiver which is adjusted into a definite position by the receipt of aseries of impulses exceeding a given number, independently of the exact number of impulses is described in our co-pending application Ser. No. 182,200, filed Dec. 29, 1937, and the transmitter described in the present application is intended to co-operate therewith What is claimed is:
  • a step-by-step telegraph transmitter com prising a transmitting shaft, means for driving said shaft at a predetermined speed, transmitting contacts, means on said shaft to operate said contacts to transmit an even integral number of impulses not greater than four impulses per revolution, a second shaft driven at a speed lower than said transmitting shaft, a plurality of helically arranged projections on said second shaft, transmitter keys representing the characters to be transmitted, members respectively controlled by individual ones of said keys arranged to coact with a respective one of said projections to stop rotation of said shafts and determine the number of impulses transmitted and means controlled by depression of any key for releasing said shafts for rotation.
  • a transmitter according to claim 1 in which said second shaft is driven from said transmitting shaft through reduction gearing.
  • a transmitter for step-by-step telegraphy comprising a rotatable shaft, a plurality of transmitting keys, means actuated by depression of any of said keys for rotating said shaft into a position dependent upon the particular key depressed, a transmitting shaft geared to said first mentioned shaft, transmitting contacts controlled by said transmitting shaft, an intermediate shaft, and meansv operated after a predetermined period of rotation of said intermediate shaft for initiating operation of said transmitting shaft.
  • a transmitter according to claim 3 further comprising means for pivoting said keys on axes parallel to said first mentioned. shaft, means mounted on pivoted levers for preventing simultaneous operation of two keys.
  • a transmitter according to claim 3 further comprising a plurality of levers for carrying said keys, and means for pivotally supporting said keys in a plurality of parallel rows.
  • a step-by-step telegraph transmitter comprising a transmitting shaft, means for driving said shaft at a predetermined speed, transmitting contacts, means on said shaft for operating said contacts upon rotation of said shaft, a second shaft geared to said transmitting shaft for operation at a lower speed, transmitting keys representing the various characters to be transmitted, means for releasing said transmitting and second shafts for a predetermined period of rotation, upon depression of any key, and means for delaying initiation of rotation of said transmitting shaft and said second shaft for a predetermined period.
  • a step-by-step transmitter comprising a rotatable shaft, a plurality of keys for representing the characters to be transmitted, means actuated by depression of a key for rotating said shaft to a position dependent upon the key depressed, means for transmitting a corresponding number of impulses duringsaid rotation, and means for ensuring a predetermined delay between the depression of a key and the starting of said shaft.
  • a transmitter according to claim 7 in which said last named means comprising an intermedi- 'ate shaft, means actuated by depression of a key for starting said intermediate shaft in rotation, and means actuated by said intermediate shaft after a predetermined period of rotation thereof for starting said first mentioned shaft into rotation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmission Devices (AREA)
  • Mechanical Operated Clutches (AREA)
  • Impact Printers (AREA)
  • Pile Receivers (AREA)
  • Gear Transmission (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Common Mechanisms (AREA)
US182201A 1937-01-12 1937-12-29 Transmitter for step-by-step telegraph systems Expired - Lifetime US2215802A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB210431X 1937-01-12

Publications (1)

Publication Number Publication Date
US2215802A true US2215802A (en) 1940-09-24

Family

ID=10156205

Family Applications (1)

Application Number Title Priority Date Filing Date
US182201A Expired - Lifetime US2215802A (en) 1937-01-12 1937-12-29 Transmitter for step-by-step telegraph systems

Country Status (6)

Country Link
US (1) US2215802A (fr)
BE (2) BE425717A (fr)
CH (2) CH233476A (fr)
FR (1) FR831558A (fr)
GB (8) GB490361A (fr)
NL (1) NL58050C (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2487118A (en) * 1945-06-15 1949-11-08 Mecanique Et Transmission Metr Telegraph keyboard transmitter
US2622153A (en) * 1948-10-15 1952-12-16 Teletype Corp Multiplex telegraph system utilizing electronic distributors

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE960545C (de) * 1953-03-21 1957-03-21 Lorenz C Ag Tastensperre, insbesondere fuer Fernschreibmaschinen
SE8802426L (sv) * 1987-10-31 1989-05-01 Triumph Adler Ag Anordning foer avtryckning av paa en summatypsbaerare anordnade skrivtecken

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2487118A (en) * 1945-06-15 1949-11-08 Mecanique Et Transmission Metr Telegraph keyboard transmitter
US2622153A (en) * 1948-10-15 1952-12-16 Teletype Corp Multiplex telegraph system utilizing electronic distributors

Also Published As

Publication number Publication date
FR831558A (fr) 1938-09-08
GB502522A (en) 1939-03-17
GB490361A (en) 1938-08-12
BE425717A (fr)
GB503384A (en) 1939-03-27
NL58050C (fr)
GB490404A (en) 1938-08-12
CH210431A (de) 1940-07-15
GB501717A (en) 1939-02-27
GB501420A (en) 1939-02-27
BE425638A (fr)
GB502521A (en) 1939-03-17
CH233476A (de) 1944-07-31
GB490413A (en) 1938-08-12

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