US2477832A

US2477832A - Automatic transmitter

Info

Publication number: US2477832A
Application number: US792883A
Authority: US
Inventors: Reginald G Schuler
Original assignee: Teletype Corp
Current assignee: AT&T Teletype Corp
Priority date: 1947-12-20
Filing date: 1947-12-20
Publication date: 1949-08-02
Anticipated expiration: 1966-08-02

Description

Aug'. 2 1949- R. G. scHuLER 2,477,832

AUTOMATIC TRANSMITTER Filed Deo. 20, 1947 4 Sheets-Sheet 1 INVENTOR REGINALD G. SCHULER BY 71u27( ATTORNEY Aug. 2, 1949. R. G. SCHULER 2,477,832

AUTOMATIC TRANSMITTER Filed Dec. 20, 1947 l 4 Sheets-Sheet 2 lNvENToR REGiNALD G. SCHULER ATTORNEY N $5 ll.

Aug Z,1949. R. G. scHULER 2,477,832

` AUTOMATIC TRANSMITTER Filed Deo. z, 1947 4 sheets-sheet s FIG. 3

FIG. 4

lNVENTOR REGINALD G. SCHULER Aug 2, 1949- R. G. scHUmzRV AUTOMATIC TRANSMITTER Filed Deo. 2o, 1947 4 sheets-sheet 4 INVENTOR N i REGINALD G. SCHULER n g.

ATTORNEY Patented Aug. 2, 1949 AUTOMATIC TRANSMITTER Reginald G. Schuler, Crystal Lake, Ill., assignor to Teletype Corporation, Chicago, Ill., a corporation of Delaware Application December 20, 1947,Y Serial No. 792,883

'7 Claims.

i This invention relates to telegraph tape transniitting apparatus and more particularly to apparatus for automatically feeding a telegraph tape into transmitting position upon the completion of Fig. 1 is a side elevational view of the trans- 2 mitter, partly cut away to show more clearly the features of the invention;

Fig. 2 is a top plan view of the transmitter and the auxiliary tape feeding apparatus;

transmission from a prior-telegraph tape. Fig. 3 is a sectional view taken substantially In a centralv telegraph exchange where an atalong the line 3 3 in Fig. 1; ktendant is taking care of a series of telegraph Fig. 4 is a fragmentary sectional view taken transmitters this invention is particularly useful. substantially along the line 4-4 in Fig. 1; By this Iinvention an operator is able to keep a Fig. 5 is a fragmentary isometric perspective seriesV of telegraph transmitters supplied conl0 View of the mechanism which controls the autotinuously with tape messages without waiting for matic tape feed out and new tape feed in mechatheend of the message currently `being transnisms; and i mitted. When a particular transmitter is func- Fig. 6 is a fragmentary isometric perspective tioning, the Iattendant may insert the leading view ofthe gearing. end ofa new tape into position over an auxiliary The present invention as disclosed herein is feed wheel and thereafter, upon the completion of particularly adapted for use with a telegraph the current message, a blank or end of message tape transmitter such as shown in the patent to signal will be sensed by the tape sensing levers M. T. GOetZ, 2,296,845, dated September 29, 1942 wiiieh is autometioaiiy transmitted. when the Itis to be particularly understood, however, that blank or end of message signal is sensed a bail the transmitting SyStem diSClOSeOl n the GOetZ is allowed to move into a position wherebyv the patent is modified in accordance with the present mechanism is actuated for automatically feedinvention and for details of the descriPtiOn 0f ing out the oldtape and feeding the new tape the transmitter itself reference should be had into transmitting position. l The leading end Yof te Sad patent the new tape having been fed to transmitting posi- In the drawings la transmitter base I I supports tion, the entire new tape is then rapid1y fedV apair of side plates l2 and I3 on which is mounted over an auxiliary feed wheel, thus making it posa 110D plate I4. A COVeI plate l5 has -a talee SlOt sible for theA attendant to position another new I1 therein and is removably mounted on the top tape on the auxiliary feed vvhee1. In this menplateelt- A power gear i8 is rotatably mounted ner the elapsed time between messages is only 0n the Side plate I3 and iS t0 be COHSdeI'ed aS the very short interval of time necessary to feed continuously rotating. The power gear I8 meshes the new tape into transmitting position from the with a transmitting SleeVe gear I9 t0 Supply 10- auxiliary feed Wheel. tational power to la transmtting sleeve 2 l. A gear An object of the invention is to provide an 22 meshes with and is continuously rotated by the apparatus for automatically feeding a new tape DOWeF gen1' la and SelVeS aS a SOulCe 0f DOWeI' OI' into transmitting position upon the completion the Can SleeVe 23. A igea? 24 Secured t0 and rtatof transmission of a message from a prior tape. able with the cam sleeve 23 meshes with a gear 26 lAnother object of the invention is to provide secured'to a freely rotatable sleeve 2l. The gear an apparatus for automatically transmitting 2B lin turn meshes With en autOmdtlC tene feed blank space out signals during the interval of out gear 28. AnOtlfleI gear 29 also Secured t0 time |between the completion of transmission of the sleeve 21 meshes with a new tape advancing One message :and the start 0f transmission of a gear 3| Secured. t0 the rotatable Sleeve 33. The succeeding message. gear 22 which is continuously rotating meshes A further object of the invention is to provide with an idler gear 32 which in turn meshes with an apparatus for rapidly feeding an entire tape, a Continuously rotating new tape feed in gear 34. the leading end of which has been fed into trans- A dlVe member 35 0f e Single revolution Clutch mitting position, over an auxiliary feed wheel to indeated generally by the numeral 3l S Splined thereby render the auxiliary feed wheel in eonto the shaft 38 and is continuously rotated due dition to receive a succeeding tape. to they continuous rotation of the transmitting Other objects, features, and advantages of the 5O sleeve gear I9 which is also secured to the shaft invention, Ialthough not specifically recited above, 38. A toothed portion 39 on the drive member 36 will be apparent from the following detailed decooperates with atoothed portion 4l on the drivenY scription when read in conjunction with the acmember 42to impart rotation thereto. A spring companying drawings, wherein: 43 abuts a collar 44 on the transmitting sleeve 2| and a collar 46 on the driven

member

42 and 3 continuously urges the driven member 42 towards the drive member 36. A cam lll on the driven member 92 is of such configuration that an electromagnetically actuated lever 88 operated by an electromagnet (not shown) will engage the cam t1 to disengage the driven member i2 from the drive member A lug 49 `on the transmitting sleeve 2| is fitted within .a slot 5| in .the driven member 12 whereby the transmitting sleeve 2| is rotated about the shaft 3f; whenever the ciutch members 36 and il?. are in engagement with one another. The lever 48 is adapted to engage the cam di whenever the electromagnet (not shown) is de-energized.

The transmitting sleeve 2| carries the usual series of transmitting cams 52 which cooperate with the usual series of gooseneck levers 53 for controlling a series of transmitting contacts 55. Also carried by the transmitting sleeve 2| is a. start-stop cam 59 which cooperates with a gooseneck lever t to control a pair of start-stop contacts (not shown specifically).

A pair of brackets '51 journal frictionlessly a shaft 58 around which a sleeve 59 is rotatable.

The sleeve 59 has a pair of collars 6| which cooperate respectively with a pair of friction washers 62 which in turn cooperate respectively with a pair of collars 63 secured to the shaft '58. The collars and friction washers assembly provide a friction clutch mechanism whereby the sleeve 59 can be rotated independently of the shaft 59 or can be rotated with the shaft 58.

VThe sleeve 59 has a tape feed wheel 61| thereon mounted for rotation therewith. The tape feed wheel til has a series of pins 66 spaced evenly around the periphery thereof which extend through a slot G1 in the top plate `||l and into a groove 98 in the cover plate I6 to thereby enter feed holes in a telegraph `tape 69 `to advance it through the transmitter. Also secured to the sleeve 59 is a ratchet wheel 1| which `is adapted to be `advanced step by step by a pawl 12 in order to advance the feed wheel 64. When vthe .feed wheel 54 is advanced by means of the Apawl 12 and ratchet wheel 1|, `the collars 6| will slip against the friction washers 62. The automatic tape feed out gear 29 also drives the feed wheel 511i, but through the medium of ythe collars 9| and .G3 and friction washers 62 assembly. Under normal transmitting conditions the ratchet wheel 1| and feed pawl 12 control the rotation of the feed wheel 64.

The pawl 12 is Ybiased in a counterclockwise direction (Fig. 1) on its pivot bolt 13 by means of a spring 14 suitably secured at its other end to the transmitter frame. The pawl 1.2 is mounted pivotally by means of .its pivot bolt 13 on a bell crank lever 16 which is mounted pivotally on a shaft 11 and carries a cam follower or roller 18. The roller 18 is held in operative engagement with a tape feed cam 19-on the transmitting sleeve 2| by means of a spring -8|. The `cam 19 has a configuration such that the low part thereof will present itself opposite the roller 18 when the tape 99 is not being sensed which allows the .spring 8|, at this time, to pivot the bell crank lever 16 counterclockwise causing the pawl 12, which is held against the ratchet wheel 1| by its spring .14, to advance the ratchet wheel 1| thereby advancing the feed wheel 64.

Aseries of tape sensing levers .82, each of which has a tape sensing pin 83 thereon, are supported pivotally on the shaft 1.1 and varebiased `in a counterclockwise direction by a series of ysprings 8'4. It is deemed desirable'to note at this point that the tape out sensing lever and pin disclosed in the afore-mentioned Goetz patent have been omitted from this disclosure for the reason that it is contemplated that the transmitter herein described will be operating continuously which eliminates the necessity of means for declutching the transmitting sleeve upon .the Acompletion of transmission from the tape.

Each of the sensing levers 82 has a depending portion 89 which cooperates with a corresponding horizontal arm B1 on each of the gooseneck levers '53, to 4thereby transfer signals sensed from the tape 99 .by the sensing pins 83 to the transmitting contacts '55 controlled by the gooseneck levers 53. .A .baili88 .mounted .pivotally on the shaft carries a cam follower or roller 89 which cooperates with a `cam *9| on the sleeve 2|. The roller 89 and cam are held in cooperative engagement by means of a spring 92 on the bail 88. As the roller 99 rides .up the high portion of the cam 9|, the bail '98 is pivoted clockwise (Fig. 1) around the shaft 1.1 .and engages .all of the depending Aportions 86 vof the tape sensing levers 82 to withdraw the tapesens'ing pins 83 from within perforations in the tape 69. As was heretofore stated it is at this time that the pawl 12 engages the ratchet wheel 1| :to advance the feed wheel 64 a step. As the cam follower 89 rides off the high Iportion `of the cam 9|, the bail l88 recedes in a counterclookwise direction in response to the urging of the springs 84 and 92, thus allowing the sensing pins G3 to again sense the tape 69.

A bail 93 is mounted pivotallyon a shaft 94 :and carries a cam follower 96 which cooperates with a cam 91 on the transmitting .sleeve 2|. A spring 98 secured to a depending arm 99 on -the bail -93 biases the bail 93 in `a clockwise direction thus tending to keep the follower .96 in engagement with the .cam 91. Each of the .depending portions -ii' fof Athe sensinglevers 82 carries ahorizontal extension |0| having a notch |02 therein with which the bail .93 is adapted to cooperate. When the sensing pins 83 all ysense spacing impulses in the tape v6.9, i. e., there is no perforations in the tape,

all -of :the notches |02 are aligned beneath the bail 93. The conguration of the cam 91 is such that the `bail 93 is held from engagement with the horizontal extensions |9| of the sensing ylevers .82 until sensing of the tape .69 by the sensing pins B3 is accomplished. At this time the low portionof the cam i9] presents .itself opposite roller 96 which allows the spring '98 to urge the bail 9-1 into the notches |92 if :all .of the notches L82 .arealigned beneath lthe bail 93 which occurs 1 only when all of the sensing pins 831sense spacing impulses in the tape :69. When the end .of the message in the tape 5.9 hasbeen :reached a'blank space out signal consisting of allspacingimpulses will be sensed by the sensing pins 83 .at which time .itis apparent that the :bail 93 will be urged into ,the notches .|a92. -When the sbail 293 is urged into the notches |02 it engagesva :bell crank .lever 5.93 mounted pivotally on a bolt |04 to .trip .off a tape feed out and new :tape feed .in mechanism to be .hereinafter described. The fbell ,crank lever carries a pair of collars which are adapted to cooperate with a pair of friction washers |I2. During normal operation of this invention the cam sleeve 23 is held in a stopped position during which time the collars I I I slip relative to collars |01 and |08. However, when the cam sleeve 23 is released it will be rotated due to friction between collars and the continuously rotating collars |01 and |08.

Carried on the cam sleeve 23 is a cam |I3 which is adapted to cooperate with a lug I6 on a blocking lever ||4. The blocking lever |I4 is mounted pivotally by a bolt ||1 suitably secured to the main frame and is biased in a counterclockwisedirection by a spring I|8 which constantly urges the lug i6 towards the cam I I3. The blocking lever ||4 carries a shoulder II9 adapted to engage the pawl 12 whenever the blocking lever ||4 is pivoted in a counterclockwise direction which thereby prevents the pawl 12 from engaging the ratchet wheel 1|. y The blocking lever ||4 is adapted to engage a depending foot 2| on the bail 88 whenever the blocking lever ||4 is pivoted in a counterclockwise direction which renders the bail 88 operative to prevent the sensing pins 83 from moving into sensing position. An arm |22 on the blocking lever II4 cooperates with a depending arm |23 on the bell crank lever' |03, whereby the spring I I8 may normally pivot the blocking lever ||4 counterclockwise when the bail 93 engages the bell crank lever |03 to cause the depending arm |23 to slip oi of the arm |22. The blocking lever ||4 also carries a roller |24 which roller |24 cooperates with a cam arm |28 on a latching lever |21 in the form of a bell crank lever pivoted on a shaft |29. Such cooperation pivots the latching lever |21 causing a tooth |28 thereon to be'disengaged from a latching cam |3| 0n the cam sleeve 23. The configuration of the cam I |3 is such that when the blocking lever ||4 is in the position shown in Fig. 1, the lug II6 is opposite a low portion of the cam I|3 which allows the blocking lever I I4 to pivot when released by the bell crank lever |23. The high portion of the cam I|3 presents itself to the lug ||6 when the sleeve 23 nears the completion of a revolution which pivots the blocking lever ||4 clockwise to release the pawl 12 and the depending portion |2| of the bail 88, and to allow the depending arm |23 of the bell crank lever |03 to again engage the arm |22 on the blocking lever |I4.

For reasons which will hereinafter appear it will now be assumed that a new tape |32 has been inserted over an auxiliary tape feed wheel |33. Under this set of conditions when a blank space out signal is sensed in the tape 69 by the sensing pins 83, the bail 93 will drop into the notches |02 pivoting the bell crank lever |03 which releases the blocking lever I I4, allowing the blocking lever ||4 to be pivoted counterclockwise by its spring I8. Thisin turn prevents further sensing by the sensing pins 83, pivots the pawl 12 from engagement with the ratchet wheel 1|, and releases the cam sleeve 23 for rotation.

When a new tape is positioned over the feed wheel 64 there usually is a series of blank or allspace signals in the tape before the beginning ofV message signals. When such a blank signal is sensed by the sensing pins 83 all of the notches |02 in the horizontal extensions IUI of the tape sensing levers 82 are aligned beneath the bail 93 which actuates the mechanism which allows the cam sleeve 23 to start rotating. In order to alleviate this problem the following mechanism has been included.V

A bail |34 is mounted pivotally cnthe shaft 94 and is biased in a counterclockwise direction by av spring |36 suitably secured to the main frame. The bail |34 carries a projecting arm |31 which is adapted to engage a bell crank lever |38 mount-Y, ed pivotally on the bolt |04 and urged in a clock-l wise direction by a spring |39. The bell crankv` lever |38 has a depending portion |4| which is somewhat longer than the depending arm |23 on the bell crank lever |03 and which is also adapted to engage the arm |22 to prevent pivotal move-.- ment of the blocking lever I4. When a new tape is advanced into position over the tape feed wheel 64, the cam ||3 will have already pivoted the blocking lever |I4 in a clockwise direction sui ciently to allow both bell crank levers |03 and |38 toJ be pivoted clockwise by their springs |05 and |39 until the arm |22 on the blocking lever ||4` is latched by the depending portion |4| of the bell crank lever |38. At this time, due to the fact that the depending arm |23 is shorter than the depending arm |4I, the bell crank lever |03 is free'fro'm the arm |22, and the blocking lever ||4 is held in unblocking position by the bell crank |38. If at this time a blank signal at the beginning of the new tape is sensed by the sensy ing pins 83, al1 of the notches |02 will be aligned beneath the bail 93; however, all that occurs is; that the now free bell crank lever |03 will be pivoted against the action of its spring |05, and the blocking lever I4 will be held in unblocking position by the bell crank lever |38. Until the occurrence of a marking impulse in the new tape, there will be successive oscillations of the bail 93 into the notches |02 in the horizontal extensions |0| of the sensing levers 82. Upon the occurrence of the first marking impulse (perforation) in the new tape, the corresponding sensing pin 83 will` sense this marking impulse which will cause the corresponding sensing lever 82 to pivot counter-` clockwise about shaft 11 whereupon the depend ing portion 86 will engage and pivot the bail |34 in a clockwise direction about the shaft 94. Such pivotal movement of the bail |34 causes the projecting arm |31 thereon to move downwardly to pivot the depending portion I4I of the bell crank lever |38 off of the armV |22 on the blocking lever II4. When this occurs the depending arm |23y on the bell crank lever |03 will be in a position to engage the arm |22 on the blocking lever ||4 which prevents the blocking lever from moving to the position whereby the sleeve 23 is released for rotation. The bell crank lever dependingl arm |23 will remain in engagement with the arm |22 until an end-of-message signal is sensed by the sensing pins 83 whereupon the sleeve 23 will be released for rotation in the manner hereinbefore described.

When the cam sleeve 23 is released for rotation. the gear 24 secured thereto drives the gear 26' which in turn drives the tape feed out gear 28 tov rapidly advance the tape feed wheel 84 thereby feeding out the old tape 69.

The sleeve 33 is rotatably mounted on a shaft |42 to which shaft is secured the new tape feed in gear 34. A toothed clutch drive member |43 secured to the shaft I 42 cooperates with a toothed driven member |44 which is slidable longitudinally on the shaft |42. The drive member |43 and driven member |44 are both part of a single revolution clutch |46 of the same type as that designated by the reference numeral 31 herein.

tinuallyfurging the fdriven :member |14 towards the drive emember M3. IRelative rotation between vlthe :sleeve =|48 :and Jdriven imember M4 is prevented due to .a lug 52 :on .the sleeve |48 which is .seated within :a slot |53 lin 'the ydriven member |44. ,The isleeve 8.48 :carries .a lug |54 which cooperates .withalug |56'on'thesleeve 33 in order 'that rotational .movement ofthe sleeve |f48 mayw'be transmittedito the Sleeve.33; .andndue to lthe .cooperation rbetween the ,lugs |54 `and |56 it;possible 'to frotate .the sleeve 33 zalmost I'one complete revolution relative tto the sleeve M48. A-clutch fthrowoutlever |:5.8,is .pivoted on a Vpair of lbolts 5.9 :secured .',to the transmitter :side `,plate |.3 :and 1is biased in .a fclockwise :direction against the driven :clutch member |44 -by -a :spring ;|:6| suitably secured to :the main frame. Theclutch throwout lever .|58 lcooperates with :a "cam (not shown) and aLlug |62 on the ldriven 4member whereby -the driven member|44 iszcammedfrom engagement vwith `the drive member |43 against the urging fof compression spring |5| whenever theclutch throwout lever Y|58 engages the driven member |44.

apertures `|69 .and |15 in `rthe top plate |.4 and cover .plate |6, respectively. When a ynew :tape |32 rhas .been positioned in .the tape slot |1 over the auxiliary tape feed wheel |33 the Ytape sensing .portion |68 will sense -the new tape -|32 in the tape .slot .|1, and pivotal movement of the new tape .sensing lever |63 into the aperture |15 in the Ycover plate |.6 will be prevented. .Itis .toxbe noted that the sensing portion |68 of the new tape sensinglever `|63 isadapted to engage the new tape |32 a short distance .beyond .the point where .the feed pins on the .auxiliary feed wheel |33 engage Ythe new tape. The reason for .this is Vthat .it is necessary to insure that the new tape |32 is engaged by the auxiliary feed wheelat the time it issensed. If rthe sensing portionV |68 is positioned alongsidethe tape engaging portion of 'the auxiliary vfeed Wheel |33, an uneverily torn new tape |32 might conceivably besensed whereas it wouldnot yet beengaged'by the .auxliary tape feed wheel |33. A link Y||| is secured pivotally by a bolt -|12 to the new tape sensing lever |63. and.is connected pivotally to ,a latching lever |13by means of a bolt |14. The latchingflever |13 is mountedpivotally on the shaft |29 and has a Atooth 16 which cooperates `with lan Aindentation (notshown) in .a locking cam .|11 on the At a time when a new 4tape |32 from the locking cam |11 `which allowsthesleeve 23 to rotate .when released by the .latching leverl21.

.A clutch trip-off lever 282 is mounted pivotally onitheY shaft |29 anda cam follower 283 thereon rides a cam :264 'secured to the sleeve 23. The clutch trip-off lever ,2,82 cooperates with a depending .arrn .283 on the clutch throwout lever t ltofactuate the clutch throwout lever |58. A latchvlever-281 mounted pivotally Von a shaft 208 and biased yin a clockwise direction by a spring 2 69 is adapted to latch a second depending arm 3H `on lthe clutch throwout lever |58 when vthe clutch .throwout lever |58 has been actuated by the clutch .trip-olf lever 282. A stud 2|2 secured to ythe link `|-1| cooperates with the latch lever 28,1 whereby the latch lever 201 is released from latchingiengagement with the depending portion 21|| of the clutch throwout lever |58 whenever there .isnonew tape |32 in the tape slot |1 above the auxiliary tape feed wheel |33. When the clutch =throwout lever |58 is thus released by the latch .lever 20.1 further rotation of the auxiliary feed wheel |33-.through the medium of the clutch |46 is prevented.

vAssuming .that the cam seelve 23 has been released for rotation,.as was heretofore stated, the

feed .wheel 64 will .be rotated through the

medium ofgears

24, 26, and 28 to rapidly feed out thel old tape .69. Rotation ofthe gear -26 also causes .gear 28 to rotate since both are secured tothecommonfsleeve -21 .rotatable about a shaft 2|3. During .that portion lof rotation of sleeve 23 whenthe teeth-.on the collar |86 are travelling from the position shown by numeral |93 to the position `shown by numeral |86 (Fig. 1) an arc of .missing teethon the gear 29 is opposite the gearBl. By-thetime the sleeve 23 has travelled to .the position thereof shown in Fig. 1, the trap door..8| will .have been-raised to its upper positionforming.abottom for the tapeslot |1, and

.the teeth .on-thegear 29 `will mesh with ,gear :3|

which ,will-rotate the-auxiliary .feed wheel |33 to advance the new tape A|372 towards the feed Wheel.-.64. ,The numberof teeth on the gear 29 is the exact number required to advance thenew tape |32 tothe yposition where one feed hole therein is '.engagedby a feed pin 86 on the 'feed wheeli-Bli. Thereafter the high part of cam 204 causes;.thelclutch trip-olf .lever 282 to trip ythe clutch i L46 :to fallow the `auxiliary vfeed vwheel |33 to'be advanced l.through .the medium of the'continuously .frotating gear 24.

in the :following description Yof the operation ofziliheiinvention it:is assumed that a -tnew `tape |312 Ehasbeen apositioned over the auxiliary feed pivotally'onabolt =|89securedgtto the :side mlatc' wheel |33 which causes the latching ilever. |113 to bedisengaged from camv |11, and that the message inthe' tape 69 has been transmitted leavling the rst blank spacel out signal in the tape 69 in a positionwhere it is sensed by the sensing p ins 83. It should be recalled that at this time the bell crank lever |38 is disengaged from the arm |22 on the blocking lever H4.

Asthe sensing pins 83 sense the first blank space outr signal in the tape 69, the notches |82 in the sensing levers 82 align themselves beneath the bail 93 which at this time is pivoted clockwise by the springv 98. As the bail 93 -moves in this manner it engages and pivots the bell crank lever |03 thus unlatching the blocking lever H4. Unlatching -of the blockinglever H4 from beneath the vertical arm |23 of the bell crank lever |83 allows the'spring H8 to urge the blocking lever H4 into the position thereof shown in Fig. 1, where the tooth H6 vrides the cam II 3, which "results in the camming of the latching lever |21 from engagement with the latching cam I3 I, the blocking of the bail 88 due to engagement of the blockingflever H4 with the depending foot |2| thereof, and the disengagement of the pawl 12 from the ratchet wheel 1|. Disengagement of the latching lever |21 from the latching cam |3| releases the sleeve 23 for rotation through the medium of the friction washers H2. f

.During the time while the old tape 69 is being rapidly fed out of the transmitter the sensing f.

pins 83 are prevented from Vperforming a sensing operation due to the blocking of the bail 38 by engagement between the vblocking lever H4 and the depending foot I2I of the bail 88. At this time the transmitting' cam sleeve 52 is continuously rotating so that blank space out signals will be transmitted automatically.

At the start of rotation of the sleeve 23, the teeth |86 on the collar |81 are in the position represented by numeral |98, so that subsequent rotation of the collar |81 with the sleeveV 23 raises thetrap door I 8| toits upper position within the aperture |82 in the top plate I4. The gear 2,4 rotates with the sleeve 23 and by means of the

gears

26 and 28 rotates the feed wheel 64 to rapidly feed the remaining portion of the tape 69 over the feed wheel 64 and out of the transmitter. The gear 29 also rotates when the sleeve 23 rotates, but due to the arc of missing teeth on gear 29, krotational motion will not be transmitted to the gear 3| until the trap door |8| has been latched in itsupper position.4 With the trap door |8| in its upper position the teeth on the gear 29 mesh with and rotate the gear 3| only until the new tape |32 has been advanced to the position where a feed hole therein is entered by one of the feed pins 66 on the feed wheelr 64.

l By. the time one of the feed pins 66 on the feed wheel 64 engages the new tape |32 the high part of the cam |92 will engage the roller |9 I to trip the latch |88 from engagement with the depending portion |96 of the trap door lever |18 which allows the trap door I8I to drop to the position indicated by numeral 20|. Also at the time when a feed pin 66 has engaged the new tape |32, the high portion of the cam H3 has reached the position opposite the tooth I I6 on the `blocking lever vI I4 which causes the blocking lever I I 4 to be pivoted from blocking engagement with the de pending portion |2| of the bail 88, thus allowing the sensing pinsv 83 to ysense the new tape |32. Pivotal movement of the blocking lever H4 by the cam I I3 also causes the shoulder I I9 to be withdrawn 'from engagementvwith thepawl 12 10 which allows the feed wheel 21 to be advanced through the medium of the pawl 12 and ratchet wheel 1 I, after which transmission from tape |32 is immediately commenced.

When the blocking lever H4 is pivoted by the high portion of the cam H3, it is pivoted sufficiently to cause the depending arm |4| of the bell crank lever |38 to latch the arm '|22 of the blocking lever II 4. Also at the time when the new tape |32 has advanced to the position where it may be sensed by the sensing pins 33, the high portion of cam 294 causes the clutch trip-orf lever 262 to be pivoted to trip the clutch throwout lever |58 from engagement with the lug |62 which releases the sleeve 33 for rotation through the medium of the gear 34. When the clutch throwout lever |58 is tripped from engagement with the lug |62, the latch lever 291 engages the depending arm 2H to hold the clutch throwout lever |56 in tripped position.

, In the case when the end of message signal has been sensed in the tape 69 but a new tape |32 has not been placed over the auxiliary tape feed wheel I 33, the new tape sensing lever |63 will sense notape which causes the tooth |16 on the latching lever |13 to engage the indentation in the locking cam |11, thus preventing rotation of the sleeve 23, while it is otherwise released for rotation by the latching lever |21. At this time the blocking lever I I4 has pivoted to the position shown in Fig. l and remains in this position whereby the pawl 12 is disengaged from ratchet 1| and the .bail 88 is blocked, locking the sensing levers 92 in the position shown in Fig. l. Only a release of the sleeve 23 by the latching lever |13 will allow the old tape 69 to be fed out over the feed wheel 64. However, the tail of the tape 69 may be manually withdrawn, the pull necessary beingonly that required to overcome the friction between the collars 6| and friction washers 62. Whether the tail -of the tape 69 is manually withdrawn from or left in position over the feed wheel 64 makes no difference in subsequent operations, for in either case the sleeve 23 will commence rotation as soon as it is released therefor by the latching lever |13. When it is desired-to transmit a message from a new tape |32 this new tape is'inserted over the auxiliary tape feed wheel |33 in the ordinary manner. This new tape |32 is then sensed' bythe new `tape sensing lever |63 il which pivots the latching lever |`|3 to release the sleeve 23 for rotation. The subsequent sequence of operations is the same as those hereinbefore described when a new tape |32 has been positioned over the auxiliary feed wheel |33 while a message is being transmitted from the tape Q9.

Various changes and modications may be made in the present invention without departing from the spirit and scope thereof.

What is claimed is:

1. In a telegraph transmitter includingT transmitting means, a main feeding means for advancing a telegraph tape past a tape sensing position at tape sensing speed, a secondary feeding means for causing said main feeding to advance a Itail of said telegraph tape out of said tape sensing position at a speed greater than said tape sensing speed, tape sensing means normally operable to actuate the transmitting means in accordance with signals sensed in Said telegraph tape, a receiver for receiving a new telegraph tape, an auxiliary feeding means normally inoperable for advancing said new telegraph tape into said tape sensing position, an end of message responsive mechanism rendered operable when an end of message signal is sensed in said telegraph tape for disabling said main feeding means and said tape sensing means, and for rendering said secondary feeding means operable to cause said main feeding means to advance said tail of said telegraph tape out of said tape sensing position at said speed greater than said tape sensing speed, and for rendering said auxiliary feeding means operable to advance the new telegraph tape into tape sensing position, and means effective when the new tape has reached the tape sensing position for rendering said tape sensing means and said main feeding means operable to sense and advance the new tape and for simultaneously disabling said secondary feeding means.

2. In a telegraph transmitter including transmitting means, a main feeding means normally operable for advancing a message control form past a message control form sensing position at a message sensing speed, means for rendering said main feeding means operable to advance a message control form out of sensing position at a speed greater than said message sensing speed, message control form sensing means for normally controlling the transmitting means, a normally ineffective auxiliary feeding means for advancing a new message control form into the message control form sensing position, an end of message responsive mechanism rendered operable when an end of message signal is sensed in said first-mentioned message control form for disabling said sensing means, for actuating said means for rendering said main feeding means operable to advance a message control form out of sensing position at a speed greater than said message sensing speed, and for rendering said auxiliary feeding means effective to advance the new message control form into said message control form sensing position, and means effective when the new message control form has reached the sensing position for rendering said message control form sensing means operable and for rendering said main feeding means operable for advancing the new message control form past the sensing position at message sensing speed.

3. In a telegraph transmitter including transmitting means controlled by a message control form sensing means, a main feeding means for feeding a message control form, an auxiliary feeding means for feeding a new message control form into transmitting position for advancement thereafter by said main feeding means, a control form receiver for receiving a new message control form, a control form senser operable on the new message control form when received by said control form receiver, a latch associated with said control form senser and operable therewith for conditioning said auxiliary feeding means when said control form senser is operated by the new message control form, an end of message responsive mechanism effective when an end of message signal is sensed in a prior message control form for rendering inoperable the message control form sensing means, said end of message responsive mechanism being further effective when said auxiliary feeding means has been conditioned for rendering said auxiliary feeding means effective to feed the new message control form into transmitting position, and means effective when the new message control form has reached the transmitting position for rendering the message control form sensing means operable to sense the new message control form and control the transmitting means.

4. A telegraph transmitter including transmitting means and a message control form sensing means, a main feeding means for feeding a message control form, an auxiliary feeding means for feeding a new message control form into transmitting position for advancement thereafter by said main feeding means, means controlled by the new message control form for conditioning said auxiliary feeding means for operation, a mechanism effective normally when a blank signal in the control form is sensed by said message control form sensing means for rendering the message control form sensing means inoperable, said mechanism also being effective normally when a blank signal in the control form is sensed by said message control form sensing means and when said auxiliary feeding means is conditioned for operation for rendering said auxiliary feeding means effective to feed the new message control form into transmitting position, means controlled by the message control form sensing means for rendering inoperative said mechanism until a signal different from a blank signal is sensed by the message control form sensing means, and means effective when the new message control form has reached the transmitting position for rendering the message control form sensing means operable to sense the new message'control form and control the transmitting means.

5. A telegraph transmitter including a transmitting means and a message control form sensing means, a` main feeding means for feeding a message control form, an auxiliary feeding means for feeding a new message control form into transmitting position for advancement thereafter by said main feeding means, means controlled by the new message control form for conditioning said auxiliary feeding means for operation, mechanism effective normally when a space out signal in the control form is sensed by said message control form sensing mean for rendering the message control form sensing means inoperable, said mechanism also being effective normally when a space out signal in the control form is sensed by said message control form sensing means and when said auxiliary feeding means is conditioned for operation for rendering said auxiliary feeding means effective to feed the new message control form into transmitting position, means controlled by the message control form sensing means for rendering inoperative said mechanism until a signal different from a space out signal is sensed by the message `control form sensing means, and means effective when the new message control form has reached the transmitting position for rendering the message control form sensing means operable to sense the new message control form and control the transmitting means.

6. In a telegraph transmitter including transmitting means controlled by a message control form sensing means, a main feeding means for feeding a message control form, a feed wheel for feeding a new message control form, a first means for actuating said feed wheel to advance a leading end of the new message control form into transmitting position, a second means for actuating said feed wheel for advancing the remainder of the new message control form over said feed wheel, said main feeding means being operable to feed the new message control form after it has been advanced to transmitting position by said feed wheel and said first means for actuating said feed wheel, a control form receiver for receiving the new message control form, means for conditioning both of said feed wheel actuating means when the new message control form is received by said control form receiver, an end of message responsive mechanism effective when an end of message signal is sensed in a prior message control form for rendering ineffective the message control form sensing means and the main feeding means, said end of message responsive mechanism being further effective when both of said feed Wheel actuating means have been conditioned for first actuating the first of said feed wheel actuating means, and when the leading end of the new message control form has been advanced into transmitting position, for simultaneously rendering effective the second of said feed wheel actuating means and said main feeding means, and means also effective when the leading end of the new message control form has been advanced into transmitting position for rendering the message control form sensing means effective to sense the new message control form and control the transmitting means 7. In a telegraph transmitter including transmitting means controlled by a message control form sensing means, a main feeding means for feeding a message control form, an auxiliary feeding means for feeding a new message control form, a directing means for directing a, leading end of the new message control form from said vauxiliary feeding means into transmitting position to be thereafter advanced by said main feeding means, a control form receiver for receiving a new message control form, means for conditioning said auxiliary feeding means when a new message control form is received by said control form receiver, an end of message responsive mechanism for rendering inoperable the message control form sensing means, said end of message responsive mechanism being further effective when said auxiliary feeding means has been conditioned for rendering said auxiliary feeding means and said directing means effective to respectively feed and direct the new message control form into transmitting position, means effective when the new message control form `has reached the transmitting position for rendering the message control form sensing means operable to sense the new message control form and control the transmitting means, and means for rendering said directing means inelective to thereby allow said auxiliary feeding means to feed the entire new message control form.

REGINALD G. SCI-IU LER.

REFERENCES CITED UNITED STATES PATENTS Name Date Potts Mar. 27, 1945 Number