US2773931A - Printing telegraph apparatus - Google Patents

Description

Dec. 11, 1956 E. E. KLEINSCHMIDT ETAL 2,773,931

PRINTING TELEGRAPH APPARATUS Filed Aug. 15, 1951 15 Sheets-Sheet l INVENTORS fawn/'70 E KLE/IVSCHM/DT EDWARD F KLE/NSCHM/DT BY CARL P ANDERSON TTORNEYS 1956 E. E. KLEINSCHMIDT ETAL PRINTING TELEGRAPH APPARATUS Filed Aug. 15, 1951 15Sneets-Sneet 2 INVENTORS EDWARD E. KLE/NSOHM/DT EDWARD F KLE/NSOHM/DT CARL P Alvasfisoxv arjwwvtg.

AT RIVEYS Dec. 11, 1956 Filed Aug. 15, l95l E. E. KLElNSCHMlDT ETAL 2,773,931

PRINTING TELEGRAPH APPARATUS 15 sneaks-sheet :s

INVENTORS EDWARD E. KLE/NSCHM/DT Eon 4R0 F KLEl/VSCHM/DT CARL P A/vamsorv 72 7 a MM,

ATTORNEYS E. E. KLEINSCHMIDT ETAL 2,773,931

PRINTING TELEGRAPH APPARATUS 'Dec. 11, 1956 15 Sheets-Sheet 4 Filed Aug. 15, 1951 T7 SMM m. m w w T as R N 0 E WE r W :b. E w A Nr E WWA FF E. E. KLEINSCHMIDT EFAL PRINTING TELEGRAPH APPARATUS Dec. 1 1, 1956 15 Sheets-Sheet 5 Filed Aug. 15, 1951 INVENTORS EDWARD E KLE/IVSCHM/DT EDWARD F KLE/NSCHM/DT CARL P ANDERSON E. E. KLEINSCHMiDT EI'AL 2,773,931

PRINTING TELEGRAPH APPARATUS fies, 11, 1955 Filed Aug. 15, 1951 15 Sneets-Sheet 6 I INVENTORS EDWARD E KLE/NSGHM/DT I y 50mm 1? KLE/NSGHM/DT 5 CARL P ANDERSON Dec. 11, 1956 Filed Aug. 15, 1951.

E. E. KLEINSCHMIDT ETAL 2,773,931

PRINTING TELEGRAPH APPARATUS l5 Sheets-Sheet '7 INVENTORS EDWARD E KLE/NSGHM/DT EDWARD F KLE/NsDHM/Dr CARL P ANDERSON BY XM 770% 9 3W ATTORNEYS Dec. 11, 1956 E. E. KLEINSCHMEDT ETA!- 2,773,931

PRINTING TELEGRAPH APPARATUS l5 Sheets-Sheet 8 Filed Aug. 15, 1951 INVENTORS EDWARD E KLE/NsGHM/DT EDWARD F KLE/NSCHM/DT CARL P ANDERSON A ORA/5Y5 Dec. 11, 1956 Filed Aug. 15, 1951 E. E. KLEINSCHMIDT ETA!- 2,773,931

PRINTING TELEGRAPH APPARATUS l5 Sheets-Sheet 9 EDWARD F KLE/NscHM/m CARL P ANDERSON Dec. 11, 1956 E. E. KLEINSCHMIDT ETA!- PRINTING TELEGRAPH APPARATUS 15 Sheets-Sheet 10 Filed Aug. 15, 1951 INl ENTORS KLE/NSCHM/DT EDWARD E.

fan 4R0 F KLE/NSOHM/DT CARL P ANDERSON BY M,

ATTORNEYS Dec. 11, 1956 Filed Aug. 15,

746 Qua E. E. KLEINS CHMIDT ETAL 2,773,931

PRINTING TELEGRAPH APPARATUS l5 Sneets-Sheet 11 INVENTORS EDWARD E KLE/NsaHM/Dr Ffffifi EDWARD .F /QE/NSGHM/0T By CARL P ANDERSON v 726 M ww Dec. 11, 1956 E. E. KLEINSCHMIDT 2,773,931

PRINTING TELEGRAPH APPARATUS Filed Aug. 15, 1951 15 Sheets-Sheet 12 INVENTORS EDWARD E KLE/NSOHM/DT EDWARD F KLEl/VSGHM/DT B CARL P ANDERSON Dec. 11, 1956 E. E. KLEINSCHMIDT ETA!- 2,773,931

PRINTING TELEGRAPH APPARATUS Filed Aug. 15, 1951 15 Sheets-Sheet 13 Eomgno E KLEINSGflJlI/DT EDWARD F KLEI/VSGHMIDT a) CARL P ANDERSON Dec. 11, 1956 E. E. KLEiNscHMlriT ETAL 2,

PRINTING TELEGRAPH APPARATUS l5 Sheets-Sheet 1 Filed Aug. 15, 1951 m m MMMN w mmmw R N SR m E W N E T 2% A KA WMA United States Patent" 6 PRINTING TELEGRAPH APPARATUS Edward El'Kleinschmidt, Miami Beach, Fla., and Edward F. Kleinschmidt, Wilmette, and Carl P; Anderson, Highland Park, 11]., assignors, by direct and mesne assign-- ments of five-sixths to Kleinschmidt Laboratories, I nc., D'eerfield, 111., a corporationof Delaware, and one-srxth to said Edward E. Kleinschmidt Application August 15, 1951,.Serial No. 241,916

44 Claims. (Cl. 178-23) The preferred embodiment of this invention is adapted-' for use with a telegraph system of the synchronized start- 5 stop type, wherein the signals comprise permutations of intervals or impulses of electrical currentcorresponding to two different line conditions extending'throughout-a definite number of time intervals; The selecting in'tervals or'impulses-of each signal are preceded by a starting interval or'impulse of uniform-line'condition and followed by a stopping or rest impulse or interval which is alwaysthe same and of opposite line condition from"th'at"0f the'starting intervalor impulse;

The two difierent-line conditions arecustomarily-re ferred to as intervals during which marking or spacing impulses are transmitted; The marking impulses correspond to intervals during which 'current'istransmitted" and the spacing impulsescorrespond to intervals during; which no current is transmitted. Usually the start-inter val' consists of a spacing impulse and the stop or'rest in'tervalconsists of a marking impulse. 'In certain instances polarized systems are used whereinth'e telegraph'signals areformed' by reversing the direction of current flowf' instead of interrupting the flow of current; Then the marking'impulse comprises a current flow in one. direction and the spacing impulse a flowof current equal in value but in'the oppositedirection'. The start'and stop pulses are used to maintain synchronism between the transmitting source and the receiving recorders: The preferred embodiment of this invention .is adapted'to operate in conjunction with a start-stop five unit signaling code, althoughitis to be understood that it may" be adapted to operate in conjunction with other codes with out departing fromthe spirit and scope of the invention.

A general object of the invention is to providel'a sendingprintingtele'graphapparatus of greatly improved Iconstruction and arrangement, materially reduced in weight and size, and of increased efiiciency'permittingcsustained oper atiodat a "speed greatlyin excess of that. reached .by machines of'th'eprior'art. l

Th-rnachines of this character heretofore produced, :and particularly'those in commercial use, are very heavy and cumbersome and cannotbe transported readily'lfrom place to place. In use they are installed and seldom moved during vtheir useful life. Suchmachines .donnot readily lend themselves.toinstallations wherethe-scenetofi operation is frequently shifted, such as sporting events, onfield operations of military organizations." Likewise they. {are not suitable .for'installationein, aircraft: where 0 every ounce of weight is of tremendous'importancesa manufacturing and maintenance costs Ducto great demand for the use of telegraph lines it has become increasingly important to economize in the use of line time; In the past to attain increased output or telegraph-printers the operating parts Were required to make more and more revolutions per minute thereby increasingthe wear and strain on the parts until it became almost impossible to fabricate parts that could withstand-the strain. The printers of the prior art in commercial'use'operate at a speed to produce fifty or sixty words per minute which is no longer satisfactory, particularly where the machine is used by the Armed Forces of the United States.

Another object of the invention therefore is to overcome the-above enumerated deficiencies of the prior art by providing a telegraph printer in'which the parts are so arranged'and designed'that the weight has'been reduced to one-third the Weight of the commercial printers now=in extensive commercial use and the output increased to onehundred words per minute without sacrificing the durability ofthe machine parts.

Another object of the invention is to greatly reduce the of telegraph printers by' designing certain of the parts for interchangeable-use "in various parts of the machine as well as in' othertypes of printingmechanisms so that such parts may bemanufactured in large quantities and their cost thereby minimized. In particular the same selecting 'control levers," and associated parts, are used and the same operating principles are applied in the signal transmitting apparatus andthe selector of the receiving mechanism.

In theprinters of the prior art it was the practice to have/the rotatable members turn a complete revolution for'each code combination of impulses transmitted and received. When a greater output was desired the entire machine was speeded up with the result that additional strainwas placed upon the parts and the machine became less reliable. The above problem'has been overcome in our device by increasing the number of function operations, code transmissions and selections made in one'revolu'tion of the rotatable shafts thus maintaining reasonable speeds While accomplishing more work per revolution. Accordingly, it is a further object of the inventionto provide a telegraph printer having a very high output without increased operating speed by transmitting and receiving the code combination of impulses representing one character during one-half revolution of the associated rotatable members.

In furtherance of .the above general objects the machine disclosed herein radically differs from previous machines by having a movable carriage which supports thetype'bars and their actuating bars and a selecting spider but does not carry the permutation code bars and cage therefor or the printing bail. Most of the prior art machines have been provided with selector vanes which extend across the front of the machine and are rocked by selecting mechanism to position the code bars.

carried by the movable type carriage to select the type bar desired to be operated. In the embodiment of the invention herein disclosed the code bars have been removed from the carriage and placed upon the stationary part of. the machine. The printing bail also has .been removed from the carriage. The resultant reduction of weight in the typebar carriage permits it to be moved at. a muchgreatcr speed and more positively with the application .of less power than was heretofore possible. Furthermore the light carriage may be stopped in its return movement with a minimum of shock. The carriageispositively controlled in its character spacing move-- ment and also in its return movement by an electric motor;

Aw-more specific 'object of' the invention-is to provide 3 a change gear arrangement which will permit the printer to be operated in association with the present commercial printers at a speed of 368.1 operations per minute (approximately 60 words per minute), or with the British teleprinters at a speed of 404 O. P. M. (approximately 66 words per minute), or at the new U. S. Armed Forces standard speed of 600 O. P. M. (approximately 100 words per minute). Thus the mechanism is arranged so that the speed relation between a fixed motor speed and a. shaft running in timed relation to printing operations may be changed to a plurality of speed relationsips while retaining the gear center positions of the motor shaft relative to the printer operating shaft. v

Another object of the invention is to permit the printer to operate much faster than previous commercial printers by dividing the printer operating cycle into two parts, namely, the selecting cycle and the function cycle, in such a way that additional time is available for the completion of certain functions which require more time to complete their operation than is available in the function cycle alone. At the end of the selecting cycle the control is transferred to the function cycle which conditions the mechanism to print the character or operate the selected machine function at the end of the function cycle. Certain functions such as the carriage return, require more time to complete their movement and the'equipment is arranged .so that these functions are started at theend of the selecting cycle, instead of at the end of the function cycle, which extends the time element between the start of the carriage return movement and the printing of a following character beyond the time of an operating cycle including the starting of the carriage return movement at the end of the selecting cycle and the printing of a following character at the end of the function cycle. Also at the end of the selecting cycle the selecting mechanism becomes immediately available to make the next selection which takes place while the function cycle of the previous selection is being completed.

A further object of the invention is to provide a novel method of supporting the typebar carriage upon a sliding gear so that a fixed relation is maintained between the supporting sliding gear and a type bar selecting driving gear on the carriage while also permitting the carriage to be readily and easily removed and replaced.

A still further object of the invention is to. provide in a telegraph printer a keyboard controlled transmitting mechanism of great simplicity, improved efficiency and prevent repeated transmittal of the same code group if a key is held depressed for too long a time.

A further object is to provide a mechanism to render thenon-repeat means ineffective when the space bar is actuated so that the spacing operations will be repeated until the space bar is released.

Another object is to provide a printer selector mechanism which enables substantially higher speed selection than heretofore possible without subjecting the mechanism to damaging speeds.

A further object is to provide a printer selector mechanismin which all the parts are of sturdy construction andpositive in their operation at high speed.

A still further object is to provide a single magnet selector mechanism having selector vlevers so designed 4' r and arranged as to positively position associated levers to mechanically set up and retain the received signals. Another object is the provision in a single magnet selector mechanism of anirnproved code plate or ring arrangement in which the usual drop in stop bars are arranged in concentric arcs and the stop arm associated therewith utilizes its ends so that a plurality of selections may be made in one revolution of the stop arm..

Av further object is to providein a'printer selector mechanism an orienting orrange finding means in which the adjustment may be initiated at a remote point and registered upon a scale to facilitate the adjustment-of the mechanism.

A still further object is the provision in a printer selector mechanism 'of frictional driving means for the selecting shaft which are normally inactive and operate only to drive the selecting shaft during the selecting opera- ;tion,-thereby reducing to a minimum the wear on the slipfrictional parts.

Another object is to provide in a printer selector, mechanism a selector lever-armature locking arrangement to ining power as an incident of the character spacing movement of the type bar carriage, thereby reducing the necessary wearing parts and decreasing the weight of the carriage.

Another object is to provide a ribbon reversing mechanism which is controlled by the available unused supply of ribbon rather than by the strain or pull exerted upon the ribbon.

A further object is to provide an inking ribbon feeding and reversing device which may be constructed as a unit and quickly and easily installed on or removed from the printerl. p

A still further object is the provision in a telegraph printer of an instrument panel adjacent the keyboardand easily accessible to the operator upon which are located all of the indicating devices and regularly used operating 7 controls, except the motor governor.

Other objects and advantages will become apparent from the following description read in connection with the appended .claims and the accompanying drawings wherein:

' ment of the combined transmitting and receiving apparatus of the invention; I Figure 2 is a rear elevation of the receiving and printingmechanism;

Figure 3 is a perspective view of a portion of the key- A board transmitter;

Figures 4 and 5 are fragmentary elevations showing, essential transmitter elements in position to send marking v and spacing impulses, respectively;

, Figure 6 is. a front elevation of the transmitter show-j "ing it in the normal or unoperated position;

Figures 7, 8 and 9 are front elevations of a portion of the transmitter showing various positions assumed by the.

mechanisms;

Figure 10 is a vertical sectionthrough the novel [transmitter contact mechanism;

Figure 11 is a side elevation of the selector mechanism, transfer mechamsm, and code bar cage of the receiver" of the invention;

tion tothe selector levers;

Figure .13, isadetail elevation of..the:. s top plateand plunger arrangement of the.:orientiug device;

Figure 14 is a rear-elevation of the selector end of the printer of the invention illustrating certain of the. drive gears and function operating cams and levers;

Figures 15 and 16 are detail elevations of .the selecting means showing the selector levers and Y-levers in alternate positions;

Figures 17 and 18are detail elevations of a portion of the-transfer means :showing the Y-levers, T-levers and code rings in alternate positions;

Figure 19 is a detail elevation, partly in section, of aportion of the stop cage;

Figure 20 is a detail elevation ofthe. function cam shaft sliding clutch and clutch latch;

Figure 21 is a perspective view of the clutch latch;

-Figure 22 is a vertical .section throughthe printing mechanism;

1 Figure 23 is a front elevation of the ribbon drive and reversing mechanism;

. Figure 24 is a plan view of the ribbon drive gear and rack;

Figure 25 is a detail elevation of the ribbon reversing cam and cam follower;

Figure 26 is a perspective view of the function selecting mechanism;

Figure 27 is a perspective view of the punch-bar guide block of the function selecting mechanism;

Figure 28 is a perspective view of the function blocking ring of the function selecting mechanism;

Figure 29 is a front elevation of the functionoperating spider and certain other associated mechanisms;

Figure 30 is a side elevation of the function operating spider and function push bar segment;

Figure 31 is a front elevation partly in section of the letter space operating lever;

Figures 32 and 33 are sections taken along line a-a in Figure 31 showing the two adjusted positions of the unshift intermediate lever;

Figure 34 is a side elevation showing the relation between ,the .function blocking ring and platen shifting mechanism;

Figure 35 is a perspective view of the platen. shift mechanism;

. Figure 36 is a perspective view of ther line-feed mechanism;

' Figure 37 is a side elevation of the platen (Figures) shift cams and operating levers;

.Figure 38is a plan view of the carriage returnand spacing mechanisms;

.Figure 39 is a side elevation of the carriage return function .cam and operating lever;

Figure 40 is a detail view of the carriage spacing detent;

Figure 41 is a front elevation of the carriage return decelerating and spacing mechanism;

:Figure 42 is a perspective view of a'portion of the .carriage return and spacing mechanism;

Figure 43 is a plan view partially in cross-section of the carriagereturn clutch mechanism shown immediately to the left of Figure 38;

Figure 44 is a rear view of the supporting mechanism for'the rear of the typebar carriage;

Fignire 45 is a section through a portion of Figure 44;

Figure 46 is a schematic view of the change gear arrangement of our invention; and

Figure 47 is a timing chart for the printer sending and receiving mechanisms.

In order to simplify the drawings, a considerable portion of the frarne structure has been omitted. Also various springs which would normally be employed for restoring various operating" parts to normal,.have been .omitted or.-shown schematically in order to avoid complicatingtthe drawings. Itis to be understood, however,

:thatsuitable supporting means may he provided forthe .wherevernecessary for assisting in the operationiof parts and for restoring the various parts .to normal.

General dazscription -A general description 'of the teletypewriter coordinated .by reference to the several sheets of drawings will first .be given, and thena detailed description of the sending or transmitting mechanism and of the receiving or printing mechanismincluding a detailed description of .the respective component elements of these mechanisms will be given.

.The-preferred embodiment of the invention as .disclosed in the drawings and specification is a complete portable sending and receiving machine capable of operating with standard Baudot code signals. The machine (Fig. 1) comprises a standard telegraph printer keyboard whichoperates a set of permutation code bars to control ansingle contact transmitter (Fig; 3) driven by a series of successively .operating cams mounted .on a shaft connected thru a clutch to an electric motor. The motor is provided with a governor to maintain its speed at 3600 R. P. The transmitter contact is electrically connected with the telegraph .lineto transmit the coded signals to a .remote telegraph receiving printer and also to the receiving or printing portion of the sending machine.

The receiving or printing apparatus comprises principally a selecting mechanism (Fig. 11) including asingle magnet selector which controls permutation code bars in a stop bar cagewhich in turn control the printing mechanism (Fig. 22) to positiona print selecting spider oppositea selected type bar push bar; a power driven cam for effecting printing by actuating a selected vtype bar; a type bar carriagev movable by power driven means for character spacing and for carriage return (Fig. 3.8.); ribbon mechanism (Fig; 23) for feeding an inked ribbon between the actuated type bar and a printing platen and for reversing the direction of movement of .the ribbon; other ribbon mechanism (Fig. 22) for raising andlowering the inked ribbon vertically with each typing operation to permit reading of the printed character; and cam controlled and operated mechanisms (Figs. 26, 35, 36, 37 and 39) forperforming the usual requisite functions of a printer.

Thesingle magnet selector (Fig. vl1) responds to signal impulses sequentially received to correspondingly position a group of Y-levers. When all of the Y-levers are set in their selected positions a print start lever is released and brings a set of T-levers in contact with the Y- levers. The T-levers assume positions which correspond to the positions of the associated Y-levers and in so doing move a set of notched permutation segments into positions corresponding to the signal impulses received. The notched or coded segments are mounted upon. a

stationary part of the machine in a stop bar cage and are associated with drop-in stop bars which are distributed over the coded segments and are spring pressedthereagainst so that one bar will be pressed into one set of notches aligned due to the positioning of the coded segments. This bar, upon selection,.is projected intoithe path of a stop arm, which is carried by a selecting shaft rotated bythe powermeans, to stop the shaft in a position corresponding to the received signal. This setting is in turn transmitted thru a gearing arrangement to a type selecting spider (Fig. 22) having a pair of diametrically opposed depending legs one of which will be positioned in accordance with the received signal to select the particular type bar which corresponds to that signal.

The setting of the selecting shaft is also transmitted to a function selecting spider (Fig. 26) which initiates the ope ation of certain of the functions, namely letter shift, motor .stop, call bell, and letter spacing. The line feed, figure shift, and car-riagereturn functions (Fig; 14) are controlleddirectly by drop-in stop bars in-the stop bar cage. .The. rapidity of operation of theprintep-is greatly increased by controlling these three functions at this point. I A cam shaft rotatably controlled' by the selector start lever carries a'start leverrestoring cam, a print cam, a function operating cam,-a line feed cam, a shift cam, and a carriage return cam. The cam shaft rotates for one-half revolution and theprint and func-v tion spiders are operated by their respective cams at the end of the rotative motion of the shaft. The printing spider is operated by a printing bail on the stationary part ofthe machine. This bail extends across the rear of the printing mechanism for the length of the printing line and is operated by the print cam.

The printing spider will be positioned in an inoperative position when the function spider is in an operative position and correspondingly the function spider will be in an inoperative position when the printing spider is in an operativeposition. The function spider when in an operative position cooperates with a function segment block provided with slots in which push bars are located. T'hesepush bars are directly connected to the 'bar and normally this operation will also cause the platen to unshift if it happened to be in the figures shift position when the space bar was operated. This arrangement reduces the possibility of error in, the printed matter should the platen fail to unshift when the Letters Shift key is operated. A simple adjustment'may be made to prevent the operation 'of the unshift means and thereby permit the platen to remain in'the figures shift position when the space bar is depressed.

The'type bar carriage is fed to the right'step-by-step by power driven means set in operation through a pawl controlled escapement movement operated by the forward and return stroke of the space function push bar.

The carriage is returned to its starting position by power means set in operation by the depression of the Carriage Return key which disengages the spacing mechanism and engages a clutch between the power shaft and jthe carriage return mechanism. An intervening slip clutch is provided to take .up shock due to the rapid acceleration of the carriage. Near the end of the carriage return movement the driving gears are unmeshed and an arm attached to the carriage return gear enters a slot in a decelerating cam which gradually reduces the speed of the moving carriage until it comes to a stop at which point the carriage return clutch is released and the spacing mechanism reengaged.

Keyboard transmitter The preferred embodiment of this invention utilizes an electrical transmitting device comprising a set of contacts; instead of the usual distributor member, operated'by a rotatable cam drum which is released for onehalf revolution at a time by the actuation of any of the keys; During this one-half revolution of the cam drum the contacts are actuated to transmit a code group of impulses which represent the character of the key which is actuated. The rotatable cam member is stopped and started for each character code group transmitted and a non-repeat mechanism is provided to prevent repeated transmittal of thesarne code group if the key lever-is held depressed for too long a time. However another mechanism is provided to render the non-repeat mechanism inoperative when the space bar is actuated so-that" the spacing operation will be repeated until the space-bar is'released; The rotatable cam drum' -is nor' mally prevented from rotating by a stop latch which is controlled by a universal bar which operates each time a key or the space-bar is depressed; and means are provided for regulating the amount of movementbetween theuniver'sal bar and the stop latch; Other means controlled by the'cam drum during its rotation return the stop latch to its normal position so that it will be effectiveto stop the rotation of the cam drum upon its completing one-half revolution, The keyboard and transmitter are assembled as a complete unit on a frame which is secured to the printer frame in a manner to permit its easy removal for the interchange of keyboard trans mitter and printer units.

The rotatable cam drum actuates'transmitter selector levers in one of two varieties'of motion to open or close the associated electrical contacts. These transmitter selector levers as well as certain other parts are identical to parts used in the printer selector mechanism and the same principles of operation are applied in both mechalectively responsive to the actuation of finger keys 50 (Fig.

1) arranged substantially like the-keys of the ordinary typewriter and attached to the upturned ends of key levers 52 which pass thru aligning and guiding slots in comb member 54, keyboard frame member 56 and a rear frame comb member 58 (see Fig. 2). The keyboard may be removably secured to the printer frame by screws 60. Spnings (not shown) may be secured between the key levers 52 and a turned over portion of rear comb member 58 to position the key levers 52in the slots and-to pull them-upwardly in a manner well known .in the art. v

When a key 59 is depressed against the tension of a spring the associated key lever 52 positions a series of five permutation bars 64 (Figs. 1 and 3) in various combinations which represent, according to the predetermined arrangement, the character assigned to the particular key 50' depressed. Each permutation bar- 64 is provided with beveled notches 68 cut therein in a manner well known in the art which allows the bars to be cammed into position by the operation of a keylever 52.

The, permutation bars have elongated slots 70 at their ends which surround mountingstuds 72, secured in the frame in any suitable manner and provided with spacing collars 74 for positioning the bars,"so that the bars are free to move .transversely under the key levers 52 to either one of two positions. The notches 68 in each bar have variously, arranged inclined faces, one such face being provided on each bar for each key lever 52, so that the bar is adapted to be moved to its right hand position by some of the keys and toits left hand position by the other keys to set: the bars'into different combinations. A universal bar 76 is mounted in front of the first permutation bar 64 and is provided with notches 78, each having a similarly inclined face, so that the universal bar 76 is moved to its right hand position whenever any key 50 is actuated. t

Each permutation-bar'64- is provided at its right hand end with a notch 80 (Figs. 4, '5 and 6) in its upper edge which engages the lower end of a. corresponding blocking latch or lever 82. The fiveblocking latches 82 extend upwardly and are mounted upon a cornmonvpivotal support 84 secured to the frame. The latches 82 control a set of transmitter selector levers 86 and each is provided the-cam with which it is associated, as will'be later e'x -which the end of screw 132 engages.

Jplained- A bracket-90'(Fig. 3) having a turnednp com-bportion forsupporting andguiding blocking latches 82: is secured to frame member 56 by suitablemeansias screws-91.

.A transmitter cam shaft 92 is journaled in the key- :board frame member 56 and connected .thru a friction clutch of a type well known in the art, to a shaft 96 (see Figs. 1 and 38) suitably journaled in themachine frame -98..and rotatably connected thru gears 100 and 102 to a constantly rotating power shaft 104, journaled in themachine frame, on which is secured a helical gear 106 which meshes with a worm gear 107 (Fig. 46) on the drive shaft .109. of an electric motor 108 (Figs. 1, 2 and 46) which is mounted on the machine frame 98. The motor 108 is provided with a suitable governor for maintaining its speed constant, the governor .being provided with suitable means-by which thespeed of the motor 108 may be adjusted. Such a governor is disclosedin detail in copending applicationSerial No. 160,687, filed May 8, 1950, now U. S.-Patent.No. 2,617,904 dated Nov. 11, 1952, by Carl P. Anderson.

.Secured to the camshaft 92 is a cam drum generally indicated at 110 (Fig. 6) provided with aseries of cam sections 111arranged helically around the drum .to successively engage and operate the selector levers 86. In

.the particular embodiment of the invention herein disclosed seven selector levers 86 are provided, .one for the startimpulse, five for the code impulses, and one for the stop impulse. A camsection 111 is provided for each 'of .the selector levers 86 and in addition a restoring cam section and a latch cam section are provided for purposes herein-after disclosed. It is to be understood that the number of permutation bars 64, blocking latches .82, selector level-s86 and cam section 111 is not limited tothe number disclosed herein but that the number is variable and determined by the number ofcurrent impulses comprising ,the particular code in use. Each of the cam sections has a pair of diametrically opposed raised portions .or cam lobes 112 which, due to the helical arrangement normally held against rotatable movement by a latch or locking bail 114 (Figs. 3 and 6) which is pivoted on pivot post 116 and has a shoulder 118 arranged to engage either of the two stops 120 formed in the front cam section of the cam drum 110. A spring 122 fastened between the machine frame and the latch 114 tends to disengagethe latch and its shoulder 118 and therebypermit thecam drum 110 to rotate but this movement is restrained by the end 124 of the latch 114 which is turned sideways to normally engage the ,top 126 of a clutch release lever128 pivoted on a stud 130 secured in the keyboard frame 56. An adjustingscrew 132'has screw threaded engagement with an orifice in the clutch release lever 128 to permit the lever to be adjusted relative to the universal bar 76 fastened between a turned over edge 136 of the lever 128 I and a post on the frame 56 tends to force the universal bar 76 to the left-and tomaintain the top 126 of lever 128 under the end 124 of latch 114 as shown in Fig. 3

of-the drawings. The adjusting screw 132 permits the release lever 128 to be adjusted relative to the universal bar 76 whereby the amount of movement of the universal 'bar 76 necessary to effect the operation of the tripping A spring 134 10 engages the end 1240f latch 1141which. is thereupon lowered to its alternate position ,by the tension of-spring 122. The end 124 engagesthe side of, an .ear 138 formed on the top edge of a transmitterrepeat block lever 140 pivoted on stud andprevents movement oftheblock lever because ear 138 extends a few thousandthsof an inch higherthan the end 124 (Fig. 6). Aspring 142 is fastened between anear144 on the block lever 140 and ear 146 on the lever 1'28 and is placed under tensionwhen the car 146 moves to the left while-the ear-144 of lever 148 is blocked. The downward movement of latch 114 is sutlicient to remove the shoulder 118 from engagement with the stop 120 on the cam drum 110 which willrotate for one-half revolution due to its connection ,thru the friction clutch tothe constantly rotating motor 108.

Each selector lever 86 (Figs. 4 and 5) has upturned portions 148 and 150 adjacent its ends, a cam follower 152,.and anotch 154 which fitsaround a squared shoe 156 loosely held on the pivot post 116. A spring- 157 is secured between the machine'frame and-the lever '86 to normally hold the lever against the shoe 156 atone end and a stop 158-at-the other end. The turned .up portions 148 and 150 engage and position a contact bail 160 pivoted at 162-.and having a pair of movable contacts 164 and 166 which cooperate with contacts 168 and170 respectively to control the condition of the line circuitof the associated telegraph system.

Contacts 168 and 170 arenlounted in contact sup- .ports172 and 174 (Figs. 6 and 10) which are adjustable screws engaging terminals 175 fitted into a supporting block 176 formed .of;insulating material. The'contacts 168 and 170 areplungers which are-pressed downward by coiled springs 178 positioned between shoulders 179 formed on the contactplungers and guide plugs .180

screwed into-the upper portion of the contactsupports 172 andil74. The supports 172'and 174. may be 'turned .in or out until the contacts 168 and 170 are in proper relationship with the contacts .164 and 166 at which time screws 182 may be set to maintain. the adjustment:- It is to be noted that the contact bail 160 is not biasedzor spring pressedinonedirection, as is usual inmechanisms of this type, but isoperated solely by mechanicalrmeans which assures positive operation in the, manner desired.

.The contact bailu160 isengaged-nearits ends by theupturned portions 148and 150 of the transmitter-levers 86 -with.just.sufiicient clearance to permit the levers and contactbailto pivot without excessive lost motion.

.As a contact-164 or 166 is raised to meet its associated contact-168 or 170 the'initialashock of meeting is cushioned or absorbed by the coiledrspring 178 within the contact support which compresses as'the'plunger'moves upwardly in the support. The distance which the contact on bail .160moves after it first engages its associated contactuntil it reaches its full extent of movement must be interrelated with-the initial tension of the spring and .the relatively low weight of the plunger contact as well as the adjusted normal position of the contactsso that the contacts will remain in engagement throughout their prescribed movement withoutaany intermittent opening and closing of the contacts which has become known as bounce. The initial tension of spring 178 is fixed by its being positioned between shoulder 179 onthe contact and guide plug 180. "This tension is not changed when the-contact support is adjusted in the block 176 to determine the normal position of contacts 168 and 170 in relation to theirassociated contacts 164 and 166, and is sufiicient to cause the closed set of contacts to remain together during an upward movement of bail 160. The contact arrangement disclosed prevents any undesired'or unauthorized opening of the contacts due to bounce as is usual in'spring pressed contacts because the mechanical. arrangement is such that the contacts,

once closed, are .held' firmly together until the next. op-

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