US2213475A - Telegraph transmitter - Google Patents

Description

Sept 3, 1940- A. H. REBER 2,213,475

TELEGRAPH TRANSMITTER INVENTOR. ALBERT H. RElBER A. H. REIBER 4 l 2,213,475

TELEGRAPH TRANSMITTER Filed .July 1a, 19:58 3 sheets-sheet 2 FIGS.

INVENTOR. ALBERT H. REIBER A ORNEY.

Sept. 3, 1940. A. H. REBER I E D i INVENTOR. ALBERT H. Rx-:lsER 79 BY |55 AT ORNEY.

Patented Sept. 3, 1940 UNrrEo STATES '2,213,475 TELEGRAPH TRANSMITTER Albert Hf Reiber, Evanston, Ill., assignor to Teletype Corporation, Chicago, Ill., a corporation of Delaware Application July 18, 1938, Serial No.219,7 "11 21 Claims.

This invention relates to printing 'telegraph apparatus and more particularly to telegraph transmitters for the transmission of character identifying signals. l

Transmission of vcharacter identifying signals in telegraph systems is frequently achieved in accordance with a control strip'including control indicia formed in varying combinations either by manually or remotely operated apparatus. Specifically, the control indicia may be in the form of transverse rows of perforations formed in a tape either b-y a keyboard perforator or by a signal controlled perforator which is commonly referred to as a reperforator. The tape thus prepared passes through a transmitter or sensing `mechanism to control correspondingly the transmission in succession of impulses videntied with the perforations, which has its tape entrance channel separated from the tape exit channel of the perforator with the result that a 'short length of tape extends between the perforator and transmitter and contains a group of periorations, for the last character perforated is not sensed unless instrumentalities are provided for advancing the tape to present such group of perfol-ations to the transmitter. Prior to the transmis-sion of signals for the succeeding groups of perforations, blank tape represented by the distance between the perforator and the 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.

An object of the invention is the provision of a telegraph signal transmittingy :apparatus to obviate diiculties previously encountered and to make possible the sensing of the last control indicia on the control strip without requiring the further advancement of the strip.

Another object of the invention is the provision of a unitary tape sensing mechanism and distributor which is extremely simple and very compact.

The above and other objects of the invention' ranged to set permutably a plurality of bars which set correspondingly a plurality of vinterponents to control, Vupon the operation of a mechanically operated punch hammer, the operation of punches arranged in a transverse row to perforate a control strip in'accordance with the code allocated to a depressed key lever. Cooplerating withy the code punches is a feed hole kpunch for inserting in the tape a feed hole which cooperates with a tape feeding mechanism of the sensing unit to advance the tape therethrough step by step in order that the groups of perforations therein will be sensed successively.

' The tape sensing mechanism includes, as previously outlined, the sensing fingers which are mounted lin a carrier capable of oscillation about a xedpivot away from and toward the exit tape channel of thekeyboard periorator. Normally, thel tape entrance'channel of the sensing unit is immediately adjacent the exit channel-of the perforator and the tape passes directly from the perforator to the sensing unit and Without any eX- posed portion of the tape. When the perforator is operated, the tape feed mechanism thereof advances the tape and moves'the sensing unit about its pivot a distance equal to the distance between the transverse rows of perforations. The sensing unit, through the sensing lingers, then senses the transverse row of perforations and controls 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 lingers. f

The sensing unit operates at a definite predetermined speed, whereas 'the perforator may be operated at a speed dependent upon the speed of the operator. If the perforator is operated at a speed'higher than the speed of rotation-of the transmitting cam shaft, 'the tape will be fed at a rate higher than the rate at which it is consumed by the sensing unit, in which case the sensing unit will be pushed in a counterclockwise direction about its pivot until it reaches a predetermined position when, if the perforator is continued to be operated at a speed higher than the speed of operation of the transmitting cam shaft, thetape will be formed in a loop extending between the sensing unit and the perforator.

WhenA a cessation in the operation of the perforator occurs, the tape will continue to be ad- Vancedthrough 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 not 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 sensing unit will bemoved about its pivot to permit its sensing fingers to sense the transverse row of perforations therein. y

A better understanding of 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 structure embodying the present 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 elevationalview of the structure disclosed in Fig. 3;

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

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

Fig. '7 shows a modification of the sensing unit associated with the perforator; and

Fig. 8 is a circuit diagram of the electrical connections for the apparatus disclosed in Fig. 3.

The present invention may be considered as including three principal units, a tape perforator 9, a tape sensing unit I9, and a transmitting unit I I (Fig. 3.) Each of the several units is mounted on a base casting I2.

The perforator shown (Figs. 1 and 5) comprises a set of punches I3 movable through openings in upper and lower guide plates I4 and I5 and cooperating with a die plate I6, the plates I4 and I6 being spaced apart to form a tape guide. Ihe punches I3 are selectively operated by an actuating member or hammer I1 and a set of permutation bars or interponents I8 corresponding in number to the number of punches I3.

The hammer I1 is arranged to oscillate about a pivot I9 and is operated by arm 20 secured to one end of a lever 2I whichis pivoted on Arod 25 journaled in ears or projections 28 and 29 formed on the outer edge of a vertical wall 39 of a casting. Lever 2I carries at its opposite end a cam roller 32 which cooperates with a cam to operate cyclically hammer I'I and eect its oscillation and correspondingly the operation of ther punch pins I3.

As disclosed in Fig. 1, a sleeve 33 having a pin 34 is adjustably mounted on arm 20. Pin 34 extends loosely through an aperture in hammer I1.

Mounted oppositely to arm 20 is a second arm 36 which, like arm 20, carries an'adjustable sleeve 31 which has an elongated pin 38 in alignment with ra punch pin 39. Punch pin 39 is partially enclosed in a housing 49 which conceals a spring 4I 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 is separ'ated 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 I, the hammer I1 will be oscillated about its pivot I9 and the feed hole punch 39 will be moved upwardly by pin 38 which extends through an aperture in hammer I1 to perforate the feed hole, and will be restored to the position shown in Fig. 1 by spring 4I following the restoration of lever 2l to the position shown in Fig. 1.

The interponents or permutation elements I8 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 upturned, which portion is slotted to form guide channels for the forward end of each of the interponents I8.

Upon each setting of the interponents I8, lever ZI is oscillated and hammer I1 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 I8. Also, upon the operation of arm 2I, pin 38 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 4I, whereas the withdrawal of the code punches is accomplished by a stripper bail 44 which is pivoted at 45 and which has` secured thereto oneend of ra retractile spring 46. As disclosed, the punch pins I3 are each pr'ovided with a shoulder which cooperates with the lower surface of spring actuated stripper bail 44 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 I1 is returning to the position shown in Fig. 1, spring 46 is effective to withdraw the actuated punches I 3 and restore them to their normal unactuated position.

As previously described, for each operation of lever ZI', 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 48 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 50 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 54 formed on feed pawl 49 and arranged with an arm 55 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 48 and to back step the feed drum 41 to present a previously perforated row of perforations in alignment with the code punches I3. A spring tensioned lever 51 pivoted on member 56 cooperates with star wheel 50 to back space the feed drum 41 and in turn the tape 43.

A spring 6I connected to the lower extremity Of feed pawl 49 serves to hold the feed pawl in l'IIS i engagement with ratchet teeth 48 of the feed drum and also normally holds the hammer I1 against the adjustable sleeve 33. When hammer |1 is moved in a clockwise direction by the action of lever 2|, spring 6| is extended. Consequently, when the force on lever 2| is relieved, the energy stored in spring 6| is releasedV and hammer |1 is restored to the position shown in- Fig. 1. Feed pawl'49 will also be restored and in being so moved, will rotate feed drum'41 to advance the tape 43 to present a succeeding area thereof in alignment with the code punches I3. It is thus seen that for each operationof hammer I1, feed drum 41 will be rotated and the tape 43 will be advanced step by step.

The interponents or permutation elements I6 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 the key levers extend a number of pairs of code bars, and since in the form shown there are ve 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 eachend by a rock arm 66. Each bar hasits endsguided by oppositely disposed guide combs 58. These rock arms are pivotally mounted on a shaft 61 secured to a block 69 which extends vtransversely of the bars 64 and 65 and which is arranged with a plurality of slots, one for each rock arm 66. A similar block 69 (not shown) is positioned adjacent the right-hand end of bars 64 and 65, as viewed in Fig. 1, 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 58. The rock arms 66 are subtsantially 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 lower edge of the corresponding code bar 64 and its other lug projects rearwardly beneath the lower edge of the corresponding code bar 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 68. rIn the form disclosed, each bar 68 is connected to its in dividual lever 69, which is pivotally mounted on shaft 10 and which has its upper end connected to its interponent I8; that is, individual to each bar 68 and its companion interponent I 8 is a lever 69, so that for each movement of bar 68, corresponding movement of interponent I8 results.

Cooperating with the upper ends of levers 69, which are beveled, is a rod or roller 1I 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 14. Rod 1I serves as a detent for levers 69.

Each of the key levers 62 which extends across the code bars 64--65 is arranged, when operated, to engage and depress one of thecode-bars of each pair and thereby set the same and the permutation bars 68 and interponents I8 in a characteristic combination. the punches I3 will be operated in the same characteristic combination upon the operation of hammer I 1 through lever 2|.

For effecting the operation of the punches I3 through the interponents I8, each key lever 62 is arranged to depress a universal bar 15'which is slidably mounted in the same manner as the code bars 64-65 and also cooperates withA a pair of rock arms secured to a connecting link l16 to operate a bail 11 which constitutes a part of the release mechanism effective for controlling the application of power to lever ZI. As disclosed in Fig. 5, one arm of bail 11 engages an adjusting screw 18 fixed in one end of pivoted arm 19 y to rotate, when the connecting link 16 is shifted,

arm 19 and remove the stop projection from the path of spring operated latch and allow yapplication 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 the key levers 62.

As disclosed in Fig. 3, an electric motor 88 has on its shaft a gear 89 which meshesl with a gear 99 secured to a shaft 9| journaled in bearings 92 and 93. Also secured to shaft 9| is a gear 94 and the driving portion of a friction and positive clutch 95. tive 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 keylevers 62, the code bars 64-'65 will be operated as will the universal bar 15 to effect the operation of the clutch release mechanism. Upon the oper'- ation of such mechanism, clutch 95 is effective, whereupon power is communicated to sleeve 96 and thus to cam 91. As cam 91 rotates, lever 2| v is operated to actuate hammer |1 against the action of spring 6|. vIt is thus seen that, for each operation of a key lever, the code bars 64,-65 will be set in a characteristic combination, that the interponents I8 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 direction, 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 I1 is restored to its normal position by the action of spring 6|, which serves also to ad-l vance 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 `I3.

Between feed drum 41 and the entrance end of the tape guide formed between the plates I4 and 4I6 is a member 98 which has its upper surface curved to direct the tape from the feed wheel tothe entrance of the tape guide in coop- Correspondingly,

Through the friction and posi-v eration with a wire loop 99 formed to correspond The sensing unit 'Ihe sensing unit I0 includes two separate frames indicated generally by the numerals |05 and |06. Each of these frames is mounted on pivots such as |01 and is capable of beingrotated on said pivots.

'I'he carrier |05, as disclosed in Fig. 1, nor.- kmally abuts the plates I4 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 I4 and |6 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 ve code punches I3, there will be a corresponding number of sensing fingers l; that is, there will be a sensing linger ||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 the plates |08 and |09 when the plates |08 and |09 abut the plates I4 and I6 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 includes, in addition to the plates |08 and |09, side members and ||2. These members are pivotally 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 springs ||6 and ||1 are secured and which, as subsequently described, is fastened to side members |40 and |4|. The opposite ends of springs ||6 and ||1 are secured to spring posts ||B and ||9, respectively, which are secured to members and ||2, respectively.

The springs ||6 and |1 serve to maintain the frame |05 normally under spring tension and tend yto rotate the frame |05 in a clockwise direction, as viewed in Figs. land 2.

Plate |09 is apertured to receive the end which is serrated, as shown in Fig. 6, of a rod |25 which is operated cyclically and which serves to grip the tape 43 and hold it against movement during the period the fingers I0 are sensing the perforations in the tape 43.

Mounted on shaft |26 are a plurality of bell crank levers |21, |28, |29, |30, |3I, and |32. These bell crank levers are individual to a sensing finger I0, except bell crank` lever |30, which isI individual to rod |25. As disclosed, the sensing ngers ||0 are pivotally secured to one arm of their respective bell crank lever on a center line substantially coincident with pivot |01, which have an extension 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. l, and to move its sensing finger ||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 noperforation in alignment therewith, its movement is correspondingly restricted.

' Common to all of the bell cranklevers and cooperating with an arm thereof is a bail |31 pivoted at |38 and carrying on an extension a cam roller.

"and another rear side plate (not shown).

|39. Bail |31 cooperates cyclically with the bell crank levers |21-l32 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.

The frame |06 includes side members |40 and |4|, a cross piece |42, and a rotatable rod |43. Side members |40 and |4| are pivoted on pivots |01 about which frame `|05 rotates.

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. Step-bystep rotation of pin wheel |45 isaccomplished 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.

As vdisclosed in Fig. 4, the lower end of stepping pawl |46 is secured to an arm of a lever |49 pivoted on stub shaft |50 and provided with a cam roller |5|. Pivoted on a rod |52 and tensioned against the pin wheel |45 is a tape nger |53 (Fig. 2).

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, Isl, and |32 to @sect their proper position.

Each bell crank lever 54 has a hook |51 at its upper end which engages the insulated upper end of a spring contact |58 and each of the latter cooperates with a contact finger |59, the

pairs of contact fingers being mounted upon but insulated from a supporting bar |60 carried by the base casting. Each spring contact |58 tends to engage its associated contact finger |59 and also serves to hold a lug |6| on the horizontal arm of the corresponding bell crank lever |54 in engagement with the surface of a cam |62, the latter forming a part of a cam sleeve |65 sleeved on a horizontal shaft 63 and extending over the horizontal arms of the bell crank levers |54. The cam |62 is provided with a helical series of slots which, as the cam is rotated, successively pass over the lugsl |6| of the bell crank levers |54. As the corresponding recess passes over one of the lugs, the associated switch contacts |58- |59 are closed, provided the horizontal arm of the bell crank lever |54 is not restricted in its movement.

The shaft |63 is journaled in a side plate |64 On the sleeve |65 carrying cam |62 is a shoulder or cam |66, and the sleeve is splined to a driven portion |61 which constitutes a part of a positive clutch through which power is communicated to the sleeve |65. The driven portion |61 of the clutch has integrally formed therewith a cam surface |68 which cooperates with an extending portion of a bail or clutch throwout lever |69 pivoted at |16, and functions as a disengaging means. A lateral projection of bail |69 cooperates with the armature of an electromagnet which, when energized, withdraws the horizontal projection |11 of bail |69 free of the cam is mounted a .gear |13, the latter being meshed with a gear 94 and driven continuously from power supplied by motor 88. Normally, of course, spring |1| 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 coo-peration of the horizontally extending portion of bell crank lever |69 with the projection of cam surface |68. Consequently, the

transmitting cam sleeve |65 which carries the y cams |62 is normally held against rotation by the stop member or bell crank lever |69, which is held in such position upon the deenergization of electromagnet |10.

As previously described, cooperating with each of the bell crank levers |54 is a bell crank lever |21, |28, |29, |3|, and |32 which are positioned in accordance with the position assumed by their respective sensing ngers H0. yIf the sensing ringer ||0 is held depressed, which will be the position it assumes if a perforation is not aligned therewith, the free end of its bell crank lever lies in the path of the horizontal arm of its bell crank lever, such as |54. Thus, when the recess in cam |62 aligns with lug |6|, the bell crank lever such as |54 is held against movement andthe contacts |58`|59 will be held open. However, if a sensing nger lllis 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 of the recess of cam |62 thereto, which results in the closure of contacts |56 and |59.

As sleeve |65 rotates, the recesses in cam |62 are presented successively to the lugs |6I on the bell crank levers |54 and the contacts |58 and |59 will be operated in a manner corresponding to the position of the sensing ngers l0; that is, if the sensing fingers ||0 sense a perforation in the tape 43, the associated bell crank levers |54 will be operated for effecting the sequential closure of contacts |58 and |59. 'Howeven if no perforation is sensed, then the contacts |58 and |59 will not be allowed to close but will be held open in the position shown in Figi.

Also secured to sleeve |65 are cams |14 and |15. Cam |14 cooperates with rollerv |39 secured to an arm of bail |31 for operating the bail cyclically, as previously and to be subsequently described. Cam |15 cooperates with roller |5| secured to one arm of bell crank lever |49 and serves to operate stepping pawl |46 to engage the next succeeding tooth of ratchet wheel |44 and cause the corresponding rotation of pin wheel |45 and, in turn, the relative movement of tape 43.

The periphery of shoulder |66 is formed as a cam having a recess to be entered by a roller 8| carried by a spring biased arm |82 pivoted to the frame at |83. The purpose of the cam sur.- face on shoulder |66, and particularly of the recess therein, in cooperation with roller |8|, is to prevent singing or chattering of the clutch comprising driving portion |12 and driven portion |61 during periods of arrestment of the latter, and to control the initial rotation of cam |62. Since spring |1| opposes the disengagement of driven clutch portion |61 from driving portion |12, a slight torsional bias may be required to establish and maintain a gapv 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 surface |68 against stop member |69. Cooperation of roller |8.| with the descending 'slope of the recess in the periphery of shoulder |66 provides the desired torsional bias. Y

Control of the initial rotation of cam |62 is important because very early in a cycle of rotation it controls one of the bell cranks |54 to impress 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 iirm engagement of the clutch portions is established, as, for example, by frictional engagement of the tips of the clutch teeth, distortion of some portion of the signal combination to be transmitted is likely to result, due to subsequent slipping of the clutch portions into rrn engagement and accompanying variation in the velocity of cam |62. The immediate establishment of rm engagement between the clutch portions may be assuredby exerting upon the driven clutch portion |61 a drag sufcient to resist rotation due to frictional engagement between the teeth. The desired drag is furnished by engagement of roller |8| with the periphery of shoulder |66 and particularly with the sharp ascending slope of the recess therein which roller |8| encounters substantially immediately upon the tripping of stop member |69.

Electromagnet |19 is controlled thro-ugh contact springs |18 and |19 which are insulatedly mounted to a frame member. Contact spring |19 carries at its free end an insulator arranged to be engaged by an arm |86 formed on the member |4| of the frame |06. When `the frames |05 and |06 are inthe position shown in Fig. 1 with the plates |08 and |99 abutting pilates |4 and |6 of the perforator, arm |89, as shown in Fig. 1, holds contact |19 free of contact |18. In-

stantly that frames |05 and |06 are moved clock-l spring |1| to move driven portion |61 rearwardly,

as viewed in Fig.'3, or to the left as viewed in Fig. 4, to engage the driving portion |12 of the positive clutch. Sleeve |65 and the camsl secured thereto are thereupon rotated.

Operation For the purpose of clarity, let it be assumed 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 |69 abut the plates i4 and i6 of the perforator. Under such circumstances, contacts |18 and |19 are opened and electromagnet |16 is deenergized, which results in stoppage of sleeve |65. i

If, under such conditions,V the keyboard perforator is operated through the depression of its key levers, the permutation bars 66-65 will be set permutably..` For each depression of a key lever, mechanism is operated for rend-ering clutch effective, whereupon power is communicated to sleeve 96, and in turn, to cam 91. The permutedsetting of the permutation bars 64-65 causes a corresponding setting of inter- 75.

tol

sleeve 31 and pin 38 operates punch .39',

against the laction of spring 4| to perforate a fle-ed hole in tape 43. Operation of hammer |1 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 depressed key lever which caused the setting of the permutation bars 64 and 65. As hammer I1 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 6I becomes effective to restore hammer |1 and stepping pawl 49 to their normal positior or the position shown in Figs. l 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 of frame |06 about its pivot a distance equal to the distance through which the tape is advanced. Frame |05 remains in the position shown in Fig. 1, due to the action of springs |I6 and |I1, in which case the sensing fingers IIO are in alignment with the transverse row of perforations inserted in tape 43 as a result of the described depression of a key lever.

The movement of frame |06, asr described, causes arm |80 to move free of contact |19, whereupon contacts |10 and |19 are closed and a circuit for the energization of electromagnet |10 is completed.

Electromagnet |10 withdraws, through its armature, latch |69 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 of sleeve |65 is prevented, due to the cooperation of roller |8| 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 |34, the movement of the sensing fingers I0 and the tape gripping rod |25. Sensing fingers ||0 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 ngers ||0 are sensing the perforations in tape 43 and the transmission of the impulses indicative of their setting.

Also, as sleeve |65 rotates, `cam |62 identified with the start impulse is effective on the bell crank lever |54 to cause the opening of contacts- |58 and |59 for the transmission* of a start impulse. Significant, of course, is the fact that for each cycle of rotation of sleeve |65, the bell crank lever |54 identiled with the start impulse will be actuated invariably to cause the opening of 'its'contacts |58 and' |59 to transmit the starting impulse. As sleeve |65 continues its rotation, its cams |62 are presented sequentially to lugs |6| on vthe bell crank levers |54 which,

as previously described, are released to close con' tacts |58 and |59, if a sensing finger I0 finds a perforation in the tape 43. If the sensing nger I I0 fails to iind a perforation in tape '43, then bell crank lever |54, through the bell crank lever individual to that particular sensing finger, will be restrained against movement and will not close contacts and |59. `Through the `rotation of sleeve |65, the impulses identified with the particular transverse row of perforations will be transmitted.

During the transmission of the impulses through the operation of contacts |58 and |59, 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 |84 to rotate pink wheel |45. However, at that instant, rod |25 has been moved upwardly and engaged tape 43 4tohold 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 |05.

After the last of the several bell crank levers |54 has been subjected to the action of the last of the cams |62, cam |14 operates bail |31 to rotate bell crank levers |21-I32 in a clockwise direction, as viewed in Fig. l, to withdraw the sensing ngers ||0 and the tape gripping rod If, during the cycle of rotation of shaft |63 just described there has been no further operation of the key levers 62, the frame |05 remains in -abutting relation with the plates I4 and I6. However, if, during the cycleof rotation of shaft |63 another key lever 62 or other key levers 62 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 |45 through the frame |05 and the transv-erse rows of perforations in the tape 43 will be sensed successively and the impulses indicative thereof will bev transmitted upon the rotation of sleeve |65. y

If the keyboard periorator is operated at a speed considerably faster than the speed of operation of sleeve |65, the frames |05 and |06 will be rotated to the position shown in Fig. 2 when a loop of tape, asshown in Fig. `2, will form between the frame |05v and the plates |4 and I6 of the perforator. As the pin wheel |45 rotates, the tape 43 will be presented to the tape sensing fingers ||0.

If there is a prolonged cessation in the opera-- 43. During such movement, the successive rowsl of perforations will be sensed and the impulses`v indicative thereof will be transmitted through the rotation of sleeve |65. y

If, during the aforementioned movement of frames |05 and |06 in clockwise direction there is no operation-of the perforator, the movement of the frames |05 and |06 continues until frame abuts the plates I4 and I6 of the perforator. When in such position, the last row of perforations in tape 43 will be sensed and the impulses identied therewith will be transmitted. Also, arm |89 Will have engaged Contact |19 to open contacts |18 and |16 to deenergize electromagnet |10. Electromagnet |18, upon being deenergized, restores the stop latch in the path of cam surface |68 which, upon being engaged, forces driven portion |51 against the tension of spring |1| to the right, as viewed in Fig. 4, whereupon a disengagement between the driven and driving portions of the clutch occurs and sleeve |55 is thus stopped.

Upon a resumption in the operation of the perforator, contacts |18 and |19 are closed and electromagnet |18 is energized, with the result that sleeve |65 rotates for continuing the operation as previously described.

M odi fication According to the modification shown in Fig. 7, the sensing unit has but a single frame |81 pivotedon pivots |88. As shown, frame |81 normally abuts the plates I6 and I4 of the perforator which, in every respect, is similar to the perforator previously described.

Included in the frame |81 are the sensing fingers |89, pin wheel |58, and feed pawl ISI which cooperates with a ratchet wheel secured to the shaft on which pin wheel is fastened and which cooperates with a cam on cam sleeve |65 to rotate the pin wheel |90 and advance the tape in engagement therewith. The cam which operates pawl |9| is positioned with respect to the other cams on sleeve |55 such that it is effective immediately following the release of the cam sleeve |65.

The sensing iingers |89 serve to control the position of bell crank levers and, in turn, the actuation of contact controllers in a manner similar to that previously described for the sensing ngers |||l.

When the tape is advanced from the perforator, the frame |81 is pushed to the left, as viewed in Fig. 7, about its pivot shaft |88 and, due to the rotation of projection |88, contacts |19 and |18 are closed for completing an energizing circuit for electromagnet |18 to release the transmitting cam sleeve |85. the movement of pawl |9| to engage the next succeeding tooth on rthe ratchet wheel secured to the shaft carrying pin wheel |98 to cause its step-by-step advancement. Such advancement occurs during the start interval of the transmitting cam shaft and prior to the transmission of the rst impulse of the code combination of impulses. Rotation of pin wheel |90 causes they framev |81 to rotate about its pivot |88 in a clockwise direction; moving it in abutting relation to the plates I4 and I6 of the perforator to sense the transverse row of perforations therein.

As the transmitting cam sleeve |65 rotates, the contact controllers |51 will be operated for operating their associated contacts and the transmission of signals indicative of the position of the sensing fingers |89.

If the perforator is operated at a speed higher than the speed of rotation of the transmitting cam shaft, then the frame |81l will be moved about its pivot in a counterclockwise direction until a stop |93 is engaged, when the movement of the frame will be arrested and a loop of tape will be formed.

As sleeve |55 rotates, it causes If there is a cessation in the operation of the perforator, the tape will be drawn step by step, due to the cyclic operation of pin Wheel |90 past the sensing fingers |89 until the. tape between the sensing unit and the perforator becomes taut. When such a condition prevails, the pin wheel |90 will be rotated as previously described and will effect the 4step-by-step advancement of the frame |81 along the tape and toward the tape eXit channel of the perforator to sense the last transverse row of perforations and to abut the plates M and l5. Contacts |18 and |19 will be opened, electromagnet |10 will be deenergized, and camsleeve |55 will bearrested.

While the invention has been disclosed and described with reference to a particular type of apparatus, it is obvious that it may be applied to other forms of apparatus without departing from the spirit and scope of the present invention.

What is claimed is:

1. In combination with apparatus for applying an unlimited number of permanent indicia on a record strip, apparatus in juxtaposition with saidv indicia applying apparatus for sensing the indicia including a plurality of sensing elements cooperating with the indicia, means responsive to said elements, Aa plurality of` electrical contacts, means for operating said contacts sequentially as determined by the operation of said means through said sensing elements, and `means to advance the strip to bring successive indicia in alignment with said sensing elements and for advancing said sensing elements along said strip to a point immediately adjacent the point of application of said indicia when a predetermined condition prevails in said strip.

2. In combination with apparatus for applying an unlimited number of permanent indicia on a record strip, apparatus in juxtaposition with said indicia applying apparatus for sensing the indicia including a plurality o f sensing elements cooperating with the indicia, means responsive to said elements, a plurality of electrical contacts, a rotary cam effective through the control of said sensing elements for operating said contacts sequentially as determined by the operation of said means through said sensing elements, and means to advance the strip to bring successive indicia in alignment with said sensing elements and for advancing said sensing elements along said strip to a point immediately adjacent the point of application-of said indicia when a predetermined condition prevails in said strip.

3. In combination with apparatus for applying an unlimited number of permanent indicia cna record strip, .apparatus in juxtaposition with said indicia applying apparatus for sensing the indicia including a plurality of sensing elements cooperating with the indicia, means individual to each of the sensing elements and set in accordance withthe position assumedv by its element corresponding to the indicia, a plurality of yelectrical contacts, a member individual to each contact and operatively related to a sensing element lthrough said individual means, rotary means for operating said members to control the operation of said electrical contacts in accordance'with the setting of said sensing elements, and means to advance the strip to bring successive indicia in alignment with said sensing elements and for advancing said sensing elements along said Astrip to a point immediately adjacent the point of application of said indicia when a predetermined condition prevails in said strip.

wtf i 4. In combination with apparatus for applying 7|`f an unlimited number of permanent indicia Von a record strip, apparatus in juxtaposition with said indicia applying apparatus for sensing the indicia including a plurality of sensing elements, a bell crank lever individual to each sensing element, a plurality of contacts, a member individual to each contact and each of said bell crank levers, motor driven means operative to control the operation of said members and in turn said l0. contacts in accordance with the position assumed by said bell crank levers as determined by said sensing elements, and means to advance the strip to bring successive indicia in alignment with said sensing elements and for advancing said sensing l elements along said strip to a point immediately adjacent the point of application of said indicia when a predetermined condition prevails in said strip.

5. In combination with apparatus for applying an unlimited number of permanent indicia on a record strip, a sensing unit in juxtaposition with said indicia applying apparatus including a plurality of sensing elements cooperating with the indicia, strip advancing means associated with 2? said sensing elements, means responsive to said elements, a plurality of electrical contacts, motor driven means for operating said contacts se said indicia when a predetermined condition prevails in said strip.

6. In combination With a strip perforator including code punches and a feed hole punch, u means for controlling the effectiveness of said punches, means for operating said code punches in accordance with the operation of said means and said feed hole punch to perforate a strip With transverse rows of perforations and feed ,M54 said strip, apparatus in juxtaposition with saidstrip perforator for sensing the code perforations in said strip including a plurality of sensing fingers, a plurality of electrical contacts through which impulses characteristic of the perforations 5g).- are transmitted, means for operating said contacts sequentially in accordance with the position assumed by said sensing lingers as determined by the perforations'in said strip, and means cooperating with the feed holes in said strip for moving 55. said sensing fingers along the strip to a point to "sense thelast row of perforations therein.

7. In combination with astrip perforator including code punches and a feed hole punch, means for controlling the eifectiveness of said punches, means for operating said code punches in accordance with the operation of said means and said feed hole punch to perforate a strip with transverse rows of perforations and feed said strip, apparatus in juxtaposition with said strip perforator for sensing the code perforations in said strip including a plurality of senslng fingers movable longitudinally of the strip, a plurality of electrical contacts through which impulses characteristic of the perforations are Igtransmitted means for operating said contacts sequentially in accordance with the position assinned by said sensing fingers as determined by the perforations in said strip, and means cooperating With the feed holes in said strip for mov- 15x. ing said strip to bring successive transverse rows of perforations in alignment with said sensing lingers and for moving said sensing fingers along the strip to a point to sense the last row of .perforations therein when a predetermined condition prevails in said strip.

8. In combination with a strip perforator including record punches and a feed hole punch, means for controlling the effectiveness of said code punches, means for operating said code punches in accordance with the operation of said means and said feed hole punch to perforate a strip with transverse rows of perforations and feed said strip, apparatus in juxtaposition with said strip perforator for sensing the code perforations in the strip including a plurality of sensing lingers, a plurality of electrical contacts, means set in accordance with the positions assumed by said sensing lingers corresponding to the perforations in said strip, means for operating said contacts mechanically as determined by the operation of said means by the positions of said sensing fingers, and strip advancing means in said sensing apparatus operative cyclically either to advance the strip to bring successive indicia into alignment with said sensing lingers or to advance said sensing fingers along said strip to a point to sense the last row of perforations therein. Y

9. In combination with a perforator for applying code perforations and feed perforations in a strip, a unit in juxtaposition with said perforator including a movable frame,l sensing ngers in said frame for sensing code perforations, feed mechanism in said frame cooperating with the feed perforations for advancing the strip, a pivoted lever secured to each of said fingers and responsive to their position, a plurality of elec-` trical contacts, and a rotary distributorl operative upon the movement of said frame to operate said contacts in accordance with the position of said levers. l n

10.` In combination with a perforator for applying code perforations and feed perforations in a strip, a unit in juxtaposition with said perforator including a movable frame, sensing fingers in said frame for sensing code perforations, feed mechanism in said frame cooperating with the feed perforations for advancing the strip, a pivoted lever secured to each of said lingers and responsive to their position, a plurality of electrical contacts, a rotary distributor including means to operate said feed mechanism and to actuate said contacts in accordance with the position of said l levers, and means actuated upon the movement of said frame for releasing said distributor.

11. In combination with a perforator for applying code perforations and feed perforations in a strip, a unit in juxtaposition with said perforator including a movable frame, sensing lingers in said frame for sensing code perforations, feed mechanism in said frame cooperating with the feed perforations for advancing the strip, a pivoted lever secured to each of said fingers and responsive to their position, a plurality of electrical contacts, a rotary distributor including means to operate said feed mechanism during a portion of the cycle of said distributor and to actuate said contacts during another portion of the cycle of said distributor in accordance with the position of said levers, and means actuated upon the movement of said frame for releasing said ldistributor.

1,2. In combination with a perforator for applying code perforations and feed perforations in a strip, a unit in juxtaposition with said perfora- 2 a pivoted lever secured to each of said fingers and responsive to "their position, aplurality of electrical contacts,` anda :rotary distributor operative when said frame 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.

13. In combination with a perforator for applying code perforations and feed perforations in a strip, a unit in juxtaposition with said perforator including a movable frame, sensing fingers in said frame for sensing code perforations, feed mechanism in said frame cooperating with the feed perforations for advancing the strip, a pivoted lever secured to each of said fingers and responsive to their position, a plurality of contacts, a rotary distributor, and means responsive to the movement of said frame for releasing said distributor to operate said contacts in accordance with the position of said levers.

14. In combination with a perforator for applying code perforations and feed perforations in a strip, a unit in juxtaposition with said perforator including a movable frame, sensing fingers in said frame for sensing code perforations, feed mechanism in said frame cooperating with the feed perforations for feeding the strip past said sensing fingers, signal transmitting means, means for operating said transmitting means in accordance With the setting of said fingers, means for operating said feed mechanism, means actuated by said transmitting operating means for operating said feed operating mechanism at the beginning of its cycle, and means actuated upon the movement of said frame for releasing said distributor.

15. In combination with a perforator for applying code perforations and feed hole perforations in a strip, a unit in juxtaposition with said perforator including a plurality of sensing fingers for sensing the code perforations, feeding mechanism cooperating with the feed perforations for advancing the strip or the unit, a number of pairs of spring contacts, a corresponding set of controllers therefor, a rotary cam member cooperating with said controllers and normally holding said pair of contacts open and having portions for permitting the shift of said contactors and the closing of said pairs of contacts in order and at spaced intervals, a stop for arresting said cam member in normal position, means for releasing said stop in advance of the operation of said sensing fingers, and means operated upon the advancement of the tape from the perforator for operating said stop releasing means.

16. In combination with a perforator for applying code perforations and feed perforations in a strip, a unit in juxtaposition with said perforator including a plurality of sensing ngers for sensing the code perforations, feeding mechanism cooperating with the feed perforations for advancing the strip or the unit, a number of pairs of spring contacts, a corresponding set of controllers therefor, a rotary cam member cooperating with said controllers and normally holding said pair of contacts open and having portions for permitting the shift of said controllers and the closing of said pairs of contacts in order and at spaced intervals, members intermediate said sensing fingers and controllers operative by said sensing fingers for controlling the position of said controllers during the rotation of said cam memberandthus theoperationf-of said cont,acts;;and' j means on the cam member forv operating j said' feeding mechanism either to'advance the` strip through said sensing unit or advance the sensing unit along saidstrip;

1'7. In combination with a. perforator forap.-

plying code perforations and feed hole perforations in a. strip, a unit in juxtaposition With said pelforator `including'a pluralityzof sensing fingers for sensing the code perforations, feeding mechanism cooperating with the feed perforations for advancing the strip or the unit, a number of pairs of spring contacts, a corresponding set of controllers therefor, a rotary cam member cooperating with said controllers and normally holding said pair of contacts open and having portions for permitting the shift of said contacts and the closing of said pairs of con- -tacts in o-rder and at spaced intervals, members intermediate said sensing fingers and said controllers operated by said sensing fingers to control the operation of said controllers upon the rotation of said cam member, and means for operating said members cyclically to allow the operation of said feeding mechanism.

18. In combination with a perforator for applying code perforations and feed hole perforations in a strip, a unit in juxtaposition with said perforato-r including a plurality of sensing fingers for sensing the code perforations, feeding mechanism cooperating with the feed perforations for advancing the strip or the unit, a number of pairs of spring contacts, a corresponding set of controllers therefor, a rotary cam member cooperating with said controllers and normally holding said pair of contacts open and having portions for permitting the shift of said contacts and the closing of said pairs of contacts in order and at spaced intervals, members intermediate said sensing fingers and said controllers operated by said sensing fingers to control the operation of said controllers upon the rotation of said cam member, and means operated cyclically for withdrawing said sensing fingers from. sensing relation 'with said strip,

19. In combination with a perforator for applying code perforations and feed hole perforations in a strip, a unit in juxtaposition with said perforator including a plurality of sensing fingers for sensing the code perforations, feeding mechanism cooperating with the feed perforations for advancing the strip or the unit, a number of pairs of spring contacts, a corresponding set of controllers therefor, a rotary cam member cooperating with said controllers and normally holding said Vpair of contacts open and having portions for permitting the shift of said contacts and the closing of said pairs of contacts in order and at spaced intervals, members intermediate said sensing fingers and said controllers operated by said sensing fingers to control the operation of said controllers upon the rotation of said cam member, a bail for operating said intermediate members, and means on said cam member for operating said bail whereby said members are operated cyclically.

20. A telegraph transmitter for transmitting signal impulses from a control strip having rows of signal indicia. including means for sensing the indicia, circuit control means, and means for operating said control means successively in accordance with the operation of said indicia sensing means, and means to advance the strip to bring successive indicia in alignment with said sensing means and for advancing said sensing means along said strip to a. point opposite the last indicia in said strip when a predetermined lcondition prevails in said strip.

21. A telegraph transmitter for transmitting signal impulses from a control strip having rows of signal indicia including means for sensing the indicia, circuit control means, a rotary distributor effective through the control of said sensing means for operating said circuit control means sequentially as determined by the operation of said sensing means, and means to advance the strip to bring successive indicia in alignment with said sensing means and for advancing said sensing means along said strip to a, point opposite the last row of signal indicia When a predetermined condition prevails in said strip.

ALBERT H. REIBER.

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