US2213223A

US2213223A - Telegraph transmitter

Info

Publication number: US2213223A
Application number: US219772A
Authority: US
Inventors: Howard L Krum; Albert H Relber
Original assignee: Teletype Corp
Current assignee: AT&T Teletype Corp
Priority date: 1938-07-18
Filing date: 1938-07-18
Publication date: 1940-09-03
Anticipated expiration: 1957-09-03

Description

Sept. 3, 1940. H. L. KRUM ET Al.

TELEGRAPH TRANSMITTER Filed July 18, 1938 5 Sheets-Sheet 1 FIG.;l

L.. 0 waa U 9 lll/4 HoARo l.. KRUM ALBERT H. REIBER Gttorneg Sept 3, 1940- H. L. KRUM E-r Al. 2,213,223

TELEGRAPH TRANSMITTER Filed July 18, 1938 5 Sheets-Sheet 2 F l G. 7 ZSnventor HOWARD L. KRUM ALBERT H. REIBER Gttotneg Spt.

3, 1940. H. L; KRUM E'r AL TLEGRAPH TRANSMITTER Filed July 18,v 1958 s sheets-sheet s (Ittorneg h Patented epi. 3', 1940l D'STATES p 2,213,223 TELEoaArn TRANSMITTER,

Howard Krum, Miami Beach, Fla., and Albert H. Reiben', Evanston, Ill., assig'nors to 'Eeletype Corporation, Ghicago, Iii., a corporation of Del- @Wavre Application my it, ieee?, serai No. ziaria lil Claims. (Cl. 17E-fi?) w Another object of the invention is the provision of a transmitter of the aforementioned type which has its elements arranged to cooperate with'a control strip with extreme accuracy and without mutilation thereof which, if occurred,

might render its advancement irregular and interfere with signal transmission.

A feature of the invention resides in the separation of sensing and strip advancing instrumentalities of a transmitter capable of transmit- 20 ting the signal for the last control indicia applied to the strip and their coordinate operation to avoid mutilation of the strip feeding perforations and thus insure its accurate and regular advancement.

,25 Transmission of character identifying signals in telegraph systems is frequentlyachieved in accordance with a control strip including control -indicla formed in varying combinations either by manually or remotely operated apparatus. g@ Specifically, the control indicia may be in the form of transverse rows of perforations formed in a tape either by a keyboard perforator or by a signal'controlled perforator which is commonly referred to as a. reperforator.' The tape thus pre- 35 pared passes through a.` transmitter orfsensing mechanism to control correspondingly the transmission ln succession of impulses identiiied with .the 'perforationa which has its tape entrance channel separated from the tape exit channel of the perforator vwith the result that a. short length of tape extends between the perforator and transmitter and contains a group of perforations, for the last character perforated is not sensed unless instrumentalities are provided for advancing the tape to present such group of perforations to the transmitter. lPrior to the transmission of signals for the succeeding groups of perforations, blank tape represented by the distance between thev perforator and thek transmitter is passed through the transmitter and line time commensurate with -said'length of blank tape is consumed, with the consequent transmission of no intelligence.

The above and other objects of the invention areaccomplished by the provision either of a,

/ of the tape. the tape feed mechanism thereof advances the manually operated keyboard perforator or a signal controlled perforator operative in conjunction with a tape sensing mechanism including a plurality of sensing fingers set permutably in accordance with the perforations or control indicia 5 in the previously prepared control strip to control the transmission of impulses symbolic of the character to be reproduced. The perforator to which the invention has been specifically applied comprises a plurality of key levers arranged to l0 set pemut'ably a plurality of bars which set correspondingly a plurality of interponents to control, upon the operation of a mechanically operated punch hammer, theoperation of punches arranged in a transverse row to perforate a coni5 trol strip in accordance with the code allocated to a depressed key lever. Cooperating Withthe code punches is a feed hole punch for inserting in the tape a feed hole which cooperates with a tape feeding mechanism of the sensing unit to 29 advance the tape therethrough step by step in order that the groups of perforations therein will be sensed successively. l The tape sensing mechanism includes two frames capable of oscillation about a. -flxed pivot away from and toward the exit tape channel of the keyboard perforator. Normally, the tape entrance channel of the sensing unit is immediately adjacent the rexit channel of the perforator and the tape passes directly from the perforator to 30 the sensing unit and without any exposed portion When the perforator is `operated,

tape and moves the sensing unit about its pivot a distance equal to the distance between the transverse rows of perforations. The sensing fingers are mounted in one of the frames and sense the transverse row of perforations to control through appropriate levers the operative position of a contact operating member individual thereto for effecting, upon the operation of a cam distributor, the transmission of impulses corresponding to the setting of the sensing fingers. Mechanism for advancing the tape through the sensing unit or for effecting 'relative movementA between the sens g unit and the tape is mounted in the other frame. These frames are interconnected by springs and tend to follow each l other.

Y transmitting cbm Shaft, the tape will be fed at .u

a rate higher than the rate at which it is consumed by the sensing unit, in which case the two frames composing the sensing unit will be pushed in a counterclockwise direction about their pivot until they reach a predetermined position when, if the perforator is continued to be operated at a speed higher than the speed oi operation of the transmitting cam shaft, the tape will be formed in a loop extending between the sensing unit and the perforator.

When a cessation in the operation of the perforator occurs, the tape will continue to be advanced through the sensing unit by the tape advancing mechanism thereof. When the loop of tape has been exhausted and the tape becomes taut between the sensing unit and the perforator, and provided operation of the perforator is notV resumed, the sensing unit due to the cyclic operation of the tape advancing mechanism and its cooperation with the feed holes in the tape, will be moved in a clockwise direction toward the perforator and in such movement, which is step by step, the transverse rows of perforations will be sensed successively until the sensing head is brought in abutting relation to the perforator when mechanism is operated for discontinuing the operation of the tape advancing mechanism through arresting the rotation of the transmitting distributor cam drum.

Immediately that operation of the perforator is resumed, the tape will be advanced thereby and the one frame of the sensing unit will be moved about its pivots to start the distributor cam drum whereby the tape advancing mechanism of the sensing unit is operated and due to the fact that the tape between the perforator and sensing unit is taut, the sensing unit will be positioned to allow the sensing ngers to sense the row of perforations and transmit, through the operation of the transmitting cam drum, a corresponding signal. During transmission, the tape is gripped by a tape gripping element operated by a cam on the cam drum.

A better understanding oi' the invention may be had from the following description, taken in conjunction With the accompanying drawings, wherein Fig. 1 is a front elevational view of apparatus embodying the invention;

Fig. 2 is another view of a part of the structure disclosed in Fig. 1 but showing the sensing unit displaced from the perforator;

Fig. 3 is a partial plan view of the essential elements of a keyboard perforator, tape sensing unit, and a signal transmitting device;

Fig. 4 is an end elevational view of the structure disclosed in Fig. 3;

Fig. 5 is a sectional view taken substantially along the line 5-3 of Fig. 3;

Fig. 6 is a detail view of the tape holding mechanism of the sensing unit; and

Fig. 7 is a circuit diagram oi' the electrical l connections for the apparatus disclosed in Fig. 3.

'I'he present invention may be considered as including three principal units, a tape perforator 9, a tape sensing unit IB, and a transmitting unit II (Fig. 3). Each of the several units is mounted on a base casting i2.

The perforator shown (Figs. l and 5) comprises a set of punches I3 movable through openings in upper and lower guide plates I4 and I 5 and cooperating with a die plate I6, the plates I4 and I6 being spaced apartto form a tape guide. The punches I3 are selectively operated by an actuating member or hammer I 'I and a set 0f permutation bars or interponents I3 corresponding in number to the number of punches I 3.

The hammer I1 is arranged to oscillate about a pivot I9 and is operated by arm 20 secured to one end of a-lever 2| which is pivoted on rod journaled in ears or projections 23 and 23 formed on the outer edge of a vertical wall 33 of a casting. Lever 2| carries at its opposite end a cam roller 32 which cooperates with a cam to operate cyclically hammer I1 and eiect its oscillation and correspondingly the operation oi' the punch pins I3.

As disclosed in Fig. 1, a sleeve 33 having a pin 34 is adjustably mounted on arm 23. Pin 34 extends loosely through an aperture in hammer I 'I.

Mounted oppositely to arm 20 is a second arm 36 which, like arm 20, carries an adjustable sleeve 31 which has an elongated pin 33 in alignment vwith a punch pin 39. Punch pin 39 is partially enclosed in a housing 40 which conceals a spring 4| arranged to subject punch 39 to spring tension and restore it to its normal position. Punch 39 is guided at its upper and lower extremities by guide plates and cooperates with -a die plate 42 which ls separated from the upper guide plate to form a tape guide. Punch 39 serves to apply to tape 43 the feed holes in advance of the application of the code perforations by code punches I3. It is thus seen that for each operation of lever 2|, the hammer I'I will be osclllated about its pivot I9 and the'feed hole punch 33 will be moved upwardly by pin 33 which extends through .an aperture in hammer |'I to perforate the feed hole, and will be restored to the position shown in Fig. 1 vby spring 4I following the restoration of lever 2| to the position shown in Fig. 1.

'I'he interponents or permutation elements Il are movable back and forth over the face of hammer I1 and are adapted to be positioned in different combinations with their outer ends either in operative positions beneath the corresponding punches I3 or in inoperative positions out of alignment with punches I3.

The free end of hammer I1 is uptumed. which portion is slotted to form guide channels for the forward end of each of the interponents I3.

Upon each'setting of the interponents I3, lever 2| is oscillated and hammer I 1 is moved about its pivot to form a row of perforations in tape 43 through the actuation of punches I3 corresponding to the setting of the interponents I3. Also, upon the operation oi' arm 2|, pin 33 will be actuated and feed hole punch 39 will be operated to perforate the feed hole in tape 43 in advance of the formation of the row of code perforations.

Withdrawal of the feed hole punch is achieved by spring 4|, whereas the withdrawal of the code punches is accomplished by a stripper bail 44 which is pivoted at 45 and which has secured thereto one end of a retractile spring 46. As disclosed, the punch pins I3 are each provided with a shoulder which coope'ates with the lower surface of spring actuated stripper bail 6G so that when the punches I3 are raised, stripper bail 44 will be moved about its pivot 45 against the action of spring 46 and Without any binding .action on the punches I3. When hammer il is returning to the position shown in Fig. l, spring 46 is effective to withdraw the actuated punches I3 and restore them to their normal unactuated position.

As previously described, for each operation of lever 2 i, punch 39 is operated to form a feed hole adapted to be engaged by the pin teeth of a feed drum 41. The latter is provided with. ratchet teeth 46 to be engaged by a feed pawl 49 which is pivotally mounted to hammer I1 and which is thus reciprocated upon each operation of the latter. A star wheel 56 and a knurled portion 5I which facilitates manual rotation are integrally formed and are secured to feed drum 41 by means of a nut. Formed on the outside of a bearing sleeve through which drum 41 'passes is a disc 52 provided with a projection .53 arranged to cooperate with an arm 66 formed. on feed pawl 49 and arranged with an arm cooperating with a slot formed in a member 56 which is capable of being depressed to cause the Withdrawal of feed pawl 49 from cooperation with teeth 6 6 and to back step the feed drumy 61 to present a previously per` forated row oi perforations in alignment with the code punches i9. A spring tensioned lever 6l pivoted on member 56 cooperates with star wheel 56 to back space the fe tape 99. l

A spring 6 l' connected to the` lower extremity of feed pawl i9 serves to hold the'feed pawl in engagement with ratchet teeth 66 of the feed drum and also normally holds the hammer Il against the adjustable sleeve 33. When hammer lli is moved in a clockwise directionby the action of lever 2 i, spring 6| is extended. Consequently, when the force on lever 2| is relieved, the energy stored in spring 6| is released and hammer il is restored to the position shown in Fig. l. Feed 'pawl i9 will also be restored and in being so moved, will rotate feed drum 91 to -advance the tape i3 to present a succeeding area thereof in alignment with the code punches I3. It is thus seen that for each operation of hammer i1, feed drum 66 will be rotated and the'tape 43 will be advanced step by step.

The interponents or permutation elements i9 are set in different combinations by a plurality of key levers 62 suitably mounted on a pivot rod and normally upheld in raised position by individual springs, the levers being provided at their forward ends with key tops 63.

Beneath Athe key levers extend a number of pairs of code bars, and since in the form shown there are five interponents I8, a corresponding number of pairs of code bars are employed. Each pair comprises a

bar

64 and 65 and each pair of bars is supported adjacent to each end by a rock arm 66. Each bar has its ends guided by oppositely disposed guide combs 58. These rock arms are pivotally mounted on a shaft 61 secured to a block which extends transversely of the

bars

64 and 65 and which is arranged with a plurality of slots, one for each rock arm 66. A similar block 60 (not shown) is positioned adjacent the right-hand end of bars 6d and 65, as viewed in Fig. l, which, too, carries a shaft 61 constituting a pivot for correspondingly shaped rock arms and which also serves to limit the endwise movement of

bars

64 and 65. One pair of rock arms is interposed between each two code bars comprising a pair, and the bars are held in proper spaced relation by the guide combs, one of which is shown at 56. v The rock arms 66 are substantially T-shaped or widened at their upper ends and are provided with offset lugs on opposite sides of and spaced some distance from the shaft 61. One of the lugs of each arm projects forwardly into a notch on the lowerv edge of the corresponding code bar 6l and its other lug projects rearwardly beneath the lower edge of the corresponding code d drum i1 and in turn the each pair and thereby set the same and the perbar 65. With this arrangement. the depression of either bar of a pair of code bars rocks the arms and lifts the other code bar.

Each pair of rock arms 66 is pivoted to a longitudinally movable permutation bar 66. In the .5 form disclosed, each bar 68v is connected to its individual lever 69, which is pivotally mounted on shaft 10 and which has its upper end connected to its nterponent I8; that is, individual to each bar -68 and its companion interponent I8 is alol lever 69, so that for each movement of bar 68, corresponding movement of lnterponent I9 results.

Cooperating with the upper ends of levers 69, which are beveled, is a rod or roller 1| secured to a U-shaped member 12 pivoted on rod 13 and urged into 'cooperation with the beveled end of each of the levers 69 by a spring 19. Rod 1| serves as a detent for levers 69.

Each of the key levers 62 which extends across the code bars 66--65 is arranged, when operated, to engage and depress one of the code bars of mutation bars 66 and interponents I9 in a characteristic combination. Correspondingly, the 26 punches E9 will be voperated in the same characteristic combination upon the operation of hammer l1 through lever2i.

For eiiecting the operation of the punches I9 through the interponents i6, each key leve'r 62 is arranged to depress a universal bar I5 which is slidably mounted in the same manner as the code bars -65 and also cooperates with apair of rock arms secured to a connecting link 16 to operate a bail l1 which constitutes a part of 'the release mechanism effective for controlling the application of power to iever 2|. As disclosed in Fig. 5, one arm of bail 'I1 engages an adjusting screw 18 ilxed in one end of pivoted arm 19 to rotate, when the connecting link 16 is shifted, arm 19 and remove the stop projection from the path of spring operated latch 89 and allow application of power to the cam for operating lever 2|. The form of the release mechanism may correspond to that disclosed in 'Patent No. 2,019,505 to A.' H. Reiber of November 5, 1935, and consequently reference is made to such patent for a full and complete understanding of the construction and operation of the release mechanism which is operated by the universal bar upon the depression of any of thekey levers 62.

As disclosed in Fig. 3, an electric motor 8 6 has` on its shaft a gear 89 which meshes with a gear 90 secured to a shaft 9| journaled

inv bearings

92 and 93. Also secured to shaft 9| is a gear 94 and the driving portion .of a friction and positive clutch 95. Through the friction and positive clutch 95 a sleeve 96 on shaft 9| is rotated. Secured to sleeve 96 is' a cam 91 which cooperates with roller 32 mounted on one arm of lever 2|. Upon the depression of any of the key levers 62, the code bars 66--65' will be operated as will the universal bar 15 to effect the operation of the clutch release mechanism. Upon the operation of such mechanism, clutch 95 is effective, whereupon powery is communicated to sleeve 96 and thus to cam 91. As. cam 91 rotates, lever 2| is operated to actuate hammer I1 against the action of spring 6|. It is thus seen that, for each operation of a key lever, the code bars 64-65 will 70 be set in a characteristic combination, that the interponents |6 will be correspondingly set, that the clutch 95 will be effective and power will be applied to cam 91, and that through cam 91 the hammer I1 will be moved in a clockwise direc- 75 tion, as viewed in Fig. 1, to cause code punches I3 to perforate the tape and punch 39 to perforate the feed hole, following which the hammer |1 is restored to its normal position by the action of spring 6|, which serves also to advance the feed drum 41 through` the operation of feed pawl 49 to advance tape 43 to present the succeeding area thereof in alignment with punches Betw'een feed drum 41 and theentrance end of thetape guide formed between lthe plates I4 and I6 is a member 98 which has its upper surface curved to direct the tape from the feed wheel to the entrance of the tape guide in cooperation with a wire loop 89 formed to correspond with the contour of drum 41 and arranged to hold the tape firmly against the drum 41. 'I'he wire loop 99,is fastened to an arm |00 which is pivoted'to permit the wire loop 99 to be moved free of the feed drum 41. Positioned above the code punches I3 is a chaff or chad chute |0|.

The sensing unit The sensing unit I0 includes two separate frames indicated generally by the numerals and |06. Each of these frames is mounted on pivots such as |01 and is capable of being rotated on said pivots.

The carrier |05, as disclosed in'Fig. 1, normally abuts the plates |4 and I6 of the perforator and has its entrance channel for the perforated tape in alignment with the exit end of the tape guide formed between plates |4 and I6 and formed by the separation of plates |08 and |09. Plates |08 and |09 are apertured to receive the reduced portion of a sensing pin such as ||0. Inasmuch as there are five code punches I3, there Awill be a corresponding number of sensing fingers ||0; that is, there will be a sensing finger ||0 for each of the possible perforations appearing in a transverse row of perforations..

The separation between the code punches I3 and the apertures in lthe plates 08 and |09 when the plates |08 and |09 abut the plates I4 and |6 corresponds to the normal spacing between successive transverse rows of perforations in tape 43. Usually the transverse rows of perforations are one-tenth of an inch apart and therefore the punches I3 and the apertures in plates |08 and |09 are correspondingly separated.

As disclosed in Fig. 4, the frame |05 includes, in addition to the plates |08 and |09, side members and ||2. mounted on pivots |01.

Secured to side members and 2 are L- shaped members ||3 and 4, respectively. These members cooperate with portions of rod ||5 which extends beyond the members and ||2 and to which one end of springsl ||6 and ||1 are secured and which, as subsequently described, is fastened to side members |40 and I4|. The opposite ends of springs 6 and ||1 are secured to spring posts ||8 and ||9, respectively, which are secured to members and I l2, respectively. The springs 6 and ||1 serve to maintain the frame |05 normally under spring tension and tend to rotate. the frame |05 in a clockwise direction, as viewed in Figs. l and 2. 1 v

Plate |09 is apertured to receive the end which is serrated, as shown in Fig. 6, of a rod |25 which is operated cyclically andwhich serves to grip the tape 43 and hold it against movement during the period the fingers 0 are sensing the perforations in the tape 03.

Mounted on shaft |26 are a plurality` of bell These members are pivotallycrank levers |21, |28, |29, |30, |3|, and |32. 'I'hese bell crank levers are individual to a sensing finger ||0, except bell crank lever |30, which is individual to rod |25. As disclosed, the sensing fingers 0 are pivotally secured to one arm of their respective bell crank lever on a center line substantially coincident with pivots |01, which have anfextension cooperating with a guide comb |33. Fastened to the other 'arm of the bell crank lever is a spring |34 which serves to rotate its bell crank lever in a counterclockwise direction. as viewed in Fig. 2, and to move its sensing nger ||0 vertically to sense the perforations in tape 43. If a perforation appears opposite a sensing finger ||0, it moves to its fullest extent, whereas if there is no perforation in alignment therewith, its movement is correspondingly restricted.

Common to all of the bell crank levers and cooperating with an arm thereof is a bail |31 pivoted at |38 and carrying on an extension a cam roller |39. Bail |31 v cooperates cyclically with the bell crank levers |21|32 to rotate the bell crank levers about their pivot |26 in a clockwise direction to withdraw sensing fingers 0 and tape finger |25 free. of tape 43. The manner in which bail |31 is operated will be subsequently described.

Rod |43 carries a ratchet wheel |44 and a pin wheel |45 which cooperates with the feed hole perforations in tape 43 to advance the tape through the, sensing unit step by step. Stepby-step rotation of pin wheel is accomplished through the cyclic operation of feed pawl |46 which cooperates with the teeth of ratchet wheel |44 to cause its step-by-step advancement. A detent |41 secured to side member |4| and to which a spring |48 is secured, serves to hold the pin wheel in its advanced position.

The transmitting unit Individual to each of the bell crank levers |21, |28, |29, |3|, and |32 is a bell crank lever |54 pivoted on shaft |55 and held in proper position by spacing washers on shaft |55 and by a guide comb |56 which also has an extension cooperating with the lower arms of bell crank levers |21, |28, |29, |3|, and |32 to effect their proper position.

Each ben crank lever |54 has a nook |51 at the surface of a symmetrical cam |62, the latter forming a part of a cam sleeve sleeved on a horizontal shaft |53 and extending over the horizontal arms of the bell crank levers |50. The cam |62 is provided with a helical series of slots which, as the cam is rotated, successively pass over the lugs |6| of the'bell crank levers |54. As the coraeiaeee responding recess passes over one of the lugs, the associated switch contacts fist-|59 are closed, provided the horizontal arm of the bell crank lever l|l is not restricted in its movement.

iii'

' oi a bail or clutch throwout lever ltii'pivoted at 11b, and functions as a disengaging means. A lateral projection of bail 169 cooperates with the armature of an electromagnet i1@ which, when energized, withdraws the horizontal, projection -l'il of bail |59 free of the cam surface iBS and its horizontal projection to allow member itl to y be shifted by spring lli into cooperation with the driving portion i12 of the clutch which is secured to a shaft ite on which is mounted a gear |13, the latter being meshed with a gear @il and driven continuously from power supplied by motor 88. Normally, of course, spring lll tends to move driven portion |61' into cooperation with driving portion |12 of the positive clutch, but is prevented from such motion due to the cooperation of the horizontally extending portion of bell crank lever l59 with the projection oi cam surface ie. ionseduently,A the transmitting cam sleeve H65 which carries the cams it? is normally held against, rotation by the stop member or bell crank lever We, which is held in such position upon the de -energization of eletrornagnet llt.

As previously described, cooperating with each of the bell crank levers E56 isa bell crank lever |21, |28, 29, |3i, and |32 which are positioned in accordance with the position assumed by their `respective sensing fingers lit. If the sensing linger llt is held depressed, which will be the position it assumes if a perforation is not aligned therewith, the free end oi its bell crank lever lies in the path of the horizontal arm of its bell crank lever, such as lit. Thus, when the recess in cam |52 aligns with lug iti, the bell crank lever such as |54', is held against movement and the contacts |58|5Q will be held open. However, if

a sensing nger IIB is allowed to ascend, which results from the presentation of a perforation in alignment therewith, its associated bell crank lever such as |54 is released upon the presentation oi' the recess of cam |62 thereto, which results in the closure of contacts ist` and E59.

|59 will be operated in a manner corresponding to the position of the sensing :lingers im; that-is,

if the sensing fingers llll sense a perforation in the tape 8S, the associated bell crank levers |56 will be operated for effecting the sequential closure of contacts |58 and |59. However, if no perforation is sensed, then the contacts l58 and' |59 will not be allowed to close but will be held open in the position shown in Fig. 1.

The periphery of shoulder its is formed as a cam having a recess to be entered by a roller itil carried by a spring biased arm it pivoted to the frame at |83. The purpose of the cam surface on shoulder itt, and particularly of the recess therein, in cooperation with roller iti, is to prevent singing or chattering oi the clutch comprising driving portion i12 and driven portion itl during periods of arrestment of the latter, and to control the initial rotation of cam it. Since spring lli opposes the disengagement of driven clutch portion itl from driving portion i12, a slight torsional bias may be required to establish and maintain a gap between the clutch portions after bare disengagement has occurred, it being understood'that disengagement and separation of the clutch portions results solely from rotation of clutch throwout cam suriace its against stop member |69. Cooperation of roller lill with the descending slope of the recess in the periphery of shoulder it@ provides the desired torsional bias.

Control of the initial rotation of cam it@ is important because very early in a cycle of rotation it controls one of the bell cranks l5@ to irnpres's upon the telegraph line the start impulse, the eiect of which is to set in operation any telegraph printer connected to the line. if cam |62 should be permitted to be rotated far enough to initiate the start impulse before firm engagement of the clutch portions is established, as, ior example, by frictional engagement oi the tips of the clutch teeth, distortion of some portion or the signal combination to be transmitted is likely 'to result, due to subsequent slipping of the clutch portions into rm engagement and accompanying variation in the velocity of cam it?. AThe immediate establishment of iirm engagement between the clutch portions may be assured by exerting upon the driven clutch'portion itl a drag sufficient gagement between the teeth. The desired drag is furnished by engagement of roller iti with the periphery of shoulder and particularly with the sharp ascending slope of the recess therein Sii dit

to resist rotation due to irictional enwhich rller |81 encounters substantially imme- I diately upon the tripping of stop member |59.

Electromagnet |10 is controlled through contact springs |18 and |19 which are insulatedly mounted to a frame member. Contact spring 519 carries at its free end an insulator arranged to be engaged by an arm ISG formed on the member itl of the frame |55. When the frames m5 and ||l|5` are in the position shown in Fig. 1 with the plates |08 and |09 and i5 of the perforator, arm |85, as shown in Fig. l, holds contact |19 free of contact |18. Instantly that frames |65 and 105 are. moved clockwise about their pivot, which occurs upon the operation of the perforator and the advancement of tape therefrom, arm i3d moves free of contact |19 and contacts |18 and llt are thereupon closed to cause the energization of electromagnet 11G. Electromagnet |10 is energized and through its, armature, withdraws stop latch its to allow spring |1| to move driven portion |51 rearwardly, asviewed in Fig, 3, or to the left as viewed in Fig. 4, to engage the driving portion |12 of the positive clutch. Sleeve |85 ,and the cams secured thereto are thereupon rotated.

abutting plates id that all of the characters previously perforated in the tape 43 have been transmitted and that the sensing unit has been moved to a position Where the plates |08 and |09 abut 'the plates Iii and I6 ofthe perforator. Under such circumstances, contacts |18 and |19 are opened and electromagnet |10 is de-energized, which results in stoppage of sleeve |65.

II, under such conditions, the keyboard perforator is operated through the depression of its key levers, the permutation bars 64--65 will be set permutably. For each depression of a key lever, mechanism is operated for .rendering clutch 95 effective, whereupon power is com Amunicated to sleeve 96, and in turn, to cam 81.

The permuted setting of the permutation bars 64-65 causes a corresponding setting of interponents i8 through the actuation of levers 69 which, through the roller 1| by the action of spring 14, will be held in their set position. Certain of the interponents i8 will be positioned beneath and in alignment with the punches I 3. Cam 91 now being rotated causes operation of lever 2| which, through adjustable sleeve 33, op-

erates hammer i1 and through adjustable sleeve 31 and pin 38 operates punch 39 against the action of spring 4I to perforatea feed hole in tape 43. Operation of hammer I1 causes the movement of the punches I3 through the interponents I8 which have been positioned to the right, as viewed in Fig. 1, to perforate tape 43 with a transverse row of perforations symbolic of the character identified with the Ydepressed key lever which caused thesetting of the permutation bars 64 andl 65. As hammer V|1 was moved vertically, stepping pawl 49 was brought into engagement with the next succeeding tooth of ratchet portion 48. As cam 91 continues its rotation, spring 6| becomes eective to restore hammer I1 and stepping pawl 49 to their normal position of the position shown in Figs. 1 and 2. The downward movement of stepping pawl 49 causes pin drum 41 to rotate in a counterclockwise direction, as viewed in Fig. 2, and advance the tape 43 a distance determined by the distance between succeeding teeth on ratchet 48.

The advancement of tape 43 causes the movement o! frame |06 about its pivot a distance equal to the distance through which the tape is advanced. Frame I 05 remains in the position shown in Fig. 1, due to the action of springs ||6 and ||1, in which case the sensing fingers ||0 are in augment with the transverse row of perforations inserted in tape 43 as a result of the described depression of a key lever.

Electromagnet |10 withdraws.'through its armature, latch and frees the shoulder on the cam surface |68 of the driven portion |61 of the clutch which slides into engagement 'with the driven portion |12 of the clutch. However, until the driven and driving portions of the clutch are fully engaged, rotation oi sleeve |65 is prevented, due to the cooperation of roller |8I on the periphery of shoulder |66. However, when the driven and driving portions of the clutch are fully engaged, sleeve |65 rotates.

As sleeve |65 rotates, cams |62, |14, and |15 rotate. Through cam |14, bail |31 is moved to allow, under the tension of their individual springs |30, the movement vof the sensing lingers ||0 and the tape gripping rod |25. Sensing iingers I0 thus assume a position determined by the perforations in the tape. The tape 43, through rod 25, will be held against movement relative to frame |05 during the period the sensing fingers H0 are sensing the perforations in tape 43 and the transmission of the impulses indicative of their setting.

Also, as sleeve |65 rotates, cam |02 identified with the start impulse is effective on the bell crank lever |50 to cause the opening of contacts |58 and |59' for the transmission of a start impulse. Significant, oi course, is the fact that for each cycle of rotation of sleeve |65, the bell crank lever |54 identified with the start impulse will be actuatedinvariably to cause the opening of its contacts |53 and |59 to transmit the starting impulse. As sleeve |65 continues its rotation, its cams |62 are presented sequentially to lugs I6| on the bell crank levers I 54 which, as previously described, are released to close contacts |58 and |50, if la. sensing ringer IIO finds a perforation in the tape 43. It lthe sensing nger H0 fails to iind a perforation in tape 43, then bell crank lever |54, through the bell crank lever individual to that particular sensing linger, will be restrained against movement and will not close contacts |58 and |58. rihrough the rotation of sleeve |65, the impulses identified with the particular transverse ,row of perforations will be transmitted.

During the transmission oi' the impulses through the operation of contacts |58 and |55, cam |15 is effective for causing the operation of stepping pawl |46. Stepping pawl |46 is moved positively upwardly by cam |15 to engage the next succeeding tooth on the ratchet wheel |44 when it is moved downwardly by a spring |54 to rotate pin wheel |45. However, at that instant, rod |25 has been moved upwardly and engaged tape 43 to hold it against movement. Under such a condition, the tape 43 being held against movement, frame |06 will be rotated in a clockwise direction about its pivot, as viewed in Fig. 1, to approach frame |55.

It, during the cycle of rotation of shaft |53 just described there' has been no further operation of the key levers 52, the trame |55 remains in abutting relation with the plates I4 and I5. However, if, during the cycle of rotation of shaft |63 another key lever 52 or other key levers 52 have been depressed, tape 43 will be advanced through the operation of pin drum 41, in which case the tape will be pulled by the action of pin wheel |46 through the frame |55 and the transverse rows of perforations in the tape 43 will be sensed successively and the impulsesindicative thereof will be transmitted upon the rotation of sleeve |65.

It the keyboard pertorator is operated at a speed considerably faster than the speed ol.' operation of sleeve |55, the frames |55 and |55 will be rotated to the position shown in Fig. 2 when a loop of tape, as shown in Fig. 3, will form between the frame |05 and the plates I4 and` I6 of the perforator. As the pin wheel |45 rotates, the tape 43 will be presented to the tape sensing ngers |I0.

. amaeas If there is a prolonged cessation in the operation of theLperforator, the loop of tape shown in Fig. 2 will be, consumed and the'tape between the frame H05 and the exit channel of the perorator will become taut, as indicated bythe dotted lines in Fig. 2. Under such conditions.

1i, during the aforementioned movement of frames i635 and i935 in clockwisefdirection 'there is no operation of the perforator, the movement of the frames iii and itl@ continues until frame iiita abuts the plates i@ and l@ of the perforator. When in such position, the last row or perforations in tape i3 will be sensed and the impulses identified therewith will be transmitted. Also, arm it@ will have engaged contact il@ to open contacts il@ and il@ to deenergize electromagnet liti. Electromagnet lili, upon being deenergized, restores the stop latch in the path of cani surface it@ which, upon being engaged, iorces driven portion lill against the tension of spring l'l to the right, as viewed in Fig. il, whereupon a disengagement between the driven and driving portions oi the clutch occurs and sleeve ist is thus stopped.

Upon a resumption in the operation of the perforator, contacts H3 and' il@ are closed and electromagnet il@ is energized, with the result that sleeve it?? rotates for continuing operation as previously described.

While the invention has `neen disclosed and clescrioetl with reference to a particular type of apparatus, it is obvious that it ne applied to other forms of apparatus without departing from the spirit and scope of the present invention.

What is claimed is:

l. combination with a neii'orator for ajcply/ing code perforations and fceri neriorations in a stri a unit including tvvo frames, sensing fingers in one of said frames for sensing code pe:- iorations, feed mechanism in the other frame cooperating With the eetl perforations ier advancing the strip, a pivoted lever secured to each ci" said fingers and responsive to their position, a plurality or electrical contacts, and a rotary distributor operative upon the movement ci one of said :trames to operate said contacts in accordance with the position or" said levers.

2. in combination with a periorator for applying code periorations and ieecl nerorations in a strip, a unit including two frames, sensing iingers in one of said :trames for sensing code perorations, feed mechanism in the other frame cooperating with the ieed perorations for advancing the strip, a pivotecl lever secured to each of said iingers and responsive to their position, a plurality of electrical contacts, and a rotary distributor including means to operate said feed mechanism and to actuate Asaid contacts in accordance with the position of said levers.

3. In combination with a nerforator for applying code perforations and feed perforations in a strip, a unit including two pivote'd frames, sensing fingers in one of said frames for sensing code perforations, feed mechanism in the other frame cooperating withl the feed operations for advancing the strip, a pivoted lever secured to each of said ngers and responsive to their position, a plurality of electrical contacts, and a rotary distributor operative when one of said frames is rotated on its pivot including means to operate said feed mechanism and to actuate said contacts in accordance with the position of 'said levers.

4. In combination with a perforator for applying code perioi'ations and feedperiorations in a strip, a unit including two frames, sensing fingers in one of said frames for sensing code periorations, feed mechanism in the other frame cooperating with the feed perforations for aclvancing the strip, a pivoted lever secured to each of said fingers and responsive to their position, a plurality of electrical contacts, a rotary distributor, and means responsive to one of said frames for releasing said distributor to operate said contacts in accordance with the position of said levers.

5. In combination with a perforator for applying code perforations and feed perforations iny a strip, a unit including two frames, spring means interconnecting said frames to allow their individual movement, sensing fingers in one ci said rarnes for sensing the code narici-ations, feed mechanism in the other of said frames cooper-f ating with the feed perforations :for feeding the strip past said sensing lingers, signal transmitting means, means for operating said transmitting means in accordance with the setting oi? said nngers, means ior operating said feed mechanisin, and means effective during the operation oi' said feed mechanism for holding said strip against movement.

o, 'in combination with apparatus for applying an unlimited number of permanent indicia on a record strip, a sensing unit including a pair oi pivot-ed iframes, means ior normally maintaining said. frames in a predetermined relationship with .each other, sensing elements'carried 'foy one ci said frames, strip advancing mechanism carried hy the other of said frames, means responsive to the control of said elements as determined ov the indicia on said strip, aioluralitv of contacts, means for operating said contacts sequentially in accordance with the operation or' said 'means through said sensing elements, .and means for operating said strip advancing mechanism to ad- Vance the strip to 'bring successive indicia in alignment with salti sensing4 elements and for advancing said sensing elements along said strip ,r to a point inmediately adjacent the point oi application of said indicia when a predetermined condition prevails in said strip.

3. ln combination with a perfor/atar or anplyng code periorations and feed periorations in a strip, a unit including two plvctecl frames,

spring means interconnecting said trames, sensing fingers in one ot said frames for sensing the code periorations, tane holding :means in the frame with said sensing ngers, ieeding mechanism in the other frame cooperating with the feed nerforations for advancing the strip, :means secured to each of said lingers and responsive to their position, a plurality oi electrical contacts, a rotary distributor operated upon the movement of one of said frames to operate said contacts in accordance with the position of salti levers, and means for operating saidl tape iceding mechanism and said tape holding mechanism whereby one of said frames is moved about its pivot against the action of said spring means.

8. i telegraph transmitter including two trames, a sensing element in one oi said frames for sensing signal indicia in a strip, mechanism in the"-other frame for advancing said strip to present the vindicia. to said sensing element,

means controlled by said sensing element, and means to operate said mechanism for each group of signal indicia in said strip and to distribute signal impulses in accordance with the response of said means to said element.

9. A telegraph transmitter including two frames, sensing ngers in one of said frames for sensing code indicia in a strip, feed mechanism in the other frame cooperating with feed perforations in said strip for effecting its advancement, a pivoted lever secured to each of said ngers and responsive to their position, a plurality of electrical contacts, and a rotary distributor operative upon the movement .of one of saidA frames to operate saidcontacts in accordance with the position of said levers.

4position of said levers for transmitting signal impulses in accordance with the indicia in the strip.

HOWARD L. KRUM. ALBERT H. REIBER.