US2358477A - Apparatus for selectively positioning typewheels - Google Patents

Description

APPARATUS FORl SELECTIVELY4 POSITIING TYPEWHEELS ATTK/VEY Sept- 19, l944- R. D. SALMON APPARATUS POR SELECTIVELY POSITIONING TYPEWHEELS 1942 4 Sheets-Sheet 2 sla c? 94 v s/b.-

sof-- y Spvt. 19, 1944. R. DfsMMlolq APPARATUS FOR SELECTIVELY POSITIONING TYPEWHEELS Filed May 28, 1942 4 Sheets-Sheet 3 Sept. 19, 1944. iR. D. sALMN 2,'3-585477' APPARATUS FOR SELECTIVELY POSITIONING TYPEWHEELS Filed May 28, 1942 4 Sheds-Sheet 4 INVENTOR.

v i n Aw 0. SAL/van BY bers having a plurality Patented Sept. 19, 1944 APPARATUS FOR SELECTIVELY POSITION- ING TYPEWHEELS Reginald Dennis Salmon Croydon, England, as-

signor to Creed and Company Limited, Croy.-

all!

don, Surrey, England, a company of Great Brit- Application May 28, 1942, Serial No. 444,860 In Great Britain July 7, 1941 172 Claims. (Cl. 178--34) This invention relates to Vapparatus in which a type wheel is selectively positioned under the control of a rotatably mounted member or memof rows of stops associated therewith co-operating with a detent or detents placed successively and selectively in accordance with a code in operative relation with the rows of stops. A teleprinter, (i. e. `a startstop printing telegraph receiver), -of this kind is described in British Patent No. 473,614, whilst a power operated typewriter of this kind is'described and claimed in British Patent No.

It is the object of the present invention to reduce the speed at which the said member or members must be driven. As the shock of arresting the said member is proportional to the square of its speed this is of considerable importance in reducing Wear on mechanical parts.

According to one feature of the presentv invention one or each of said members is provided with a plurality of different rest positions and is selectively allowed to rotate through apredetermined angle between two of said rest positions oris prevented from so rotating according to the rela-j tion between the nature of an element of said code and the rest position of said member.

The invention is applicable to a printing telegraph receiver as described in Patent No. 473,614 in which the typewheel makes one complete revo lution for each half revolution of a member carrying rows of stops. As described in the said Patent 473,614 the said member has two rest positions 180 apart. The detent which is selectively moved in accordance with the nature of the first code element of the received combination arrests the said member after a rotation of 90 corresponding to a typewheel rotation of 180. In applying the'present invention to such an arrangement the member carrying the vrows of stops is provided with four rest positions 90 apart and is selectively allowed a rotation through 90. v

The invention is also applicable to a printing telegraph receiver or to a power operated typewriter as described in British Patents, Nos. 534, 206 and 529,983 respectively in which a typewheel is rotated under the control of Vone member having a plurality of rows of stops and moved longitudinally under the control of another member having a plurality of rows of stops.l In applying the invention to suchapparatus, either or both of the said members would be provided with two rest positions 180 apart. f"

According to another feature of the invention in apparatus of the kind specified one or each of said members is provided with two diiferent rest positions 180 Vapart and is selectively released for rotation through 180 or prevented from so rotatingaccording to the relation between theV nature of an element of said code and the rest position of said member.

In the arrangements of the prior art the typewheel must be returned to an unvariable starting position before it can be released by the rst unit of the code. In the arrangements described in the British Patent 473,614 the speed of the typewheel must be at least 21/2 times that of theY cam shaft operating the detents co-operating with the rows of stops. In British Patents 534,206 and 529,983 there are described arrangements in which the speed of the typewheel is reduced `by proportioning the intervals allowed for the successive movements of the typewheel so as to ydecrease as the degreeof movement to be executed by the typewheel decreases and in this way thespeed of rotation of the typewheel is reduced to twice that of the cam shaft.

The arrangement accordingto the present invention is independent of the improvements ac,- cording to Patents 534,206 and 529,983 but may be used with the latter and if so used the speed of the typewheel is reduced to ll/gtimes that of the cam shaft.

In the preferred embodiments of the present invention the typewheel is mounted so as to rotate withv a rotary shaft carrying the various rows of stops. This shaft is provided with two stops apart for dening the rest positions of the shaft.

A first code element of a given nature, say spacing, serves Vto release the shaft for a rotation of 180 if it is initially in one rest position,

whilstif it' is initially inthe opposite rest position a rst code element of the opposite nature serves to release it for such rotation.

'Ihe nature of the invention will be better understood from the following description of two different embodiments thereof taken in'conjunction with the accompanying drawings of which:

Fig. 1 is a perspective exploded viewof a printing telegraph receiver according to the invention, some parts being omitted for the sake of clearness.

Fig. 2 is a like view of feeding Fig. 1.

the printing and paper Fig. 3 is alike view of additional mechanisms 4 hich may be used 'with that of Fig. 2 forcer-V tain applications of the receiver. l 4' mechanism of the receiver shown in clutch 3 from gear 4, which is driven from the l driving motor. normal stop arms 5 and 6, a iirst selecting arm (positive) 1 and a first selecting arm (negativelv The typewheel shaft 2` carries 8, a member 9 having secondtselecting arms, a Y

member I having third` selecting arms, amember II having fourth selecting arms, and a member I2 having fifth selecting arms. It should be observed that the second, third, fourth and fifth selected members have two, four, eight and.

sixteen arms respectively.

Co-operating with the normal stop arms al'd y 6V is a detent lever' I V3, normally held in engagement with the arm 5 or 6 by means of a downwardly extending portion/engaging with a common latch I4r against the action of spring -I5. Beten-ts I6, `I1,y I8, I9, 29 and 2I loo-operate with stop arms 1, 8,'9, I0, Il and |72 respectively, each detent having a downwardly extending arm adaptedv to co-operate with the common latch member 'I4. Each detent isracted uponby a spring,` tendingV to Withdraw it from the path of its. associated stop Detent I6 isf provided with a third arm carrying` a bearing, in Vwhichis journalled a. pivot 22. The pivot 22 carries a. cam lever'23 adapted' to cooperate with a 'cam 24 'and lprovided with a latch face 25'., This latter is adapted to cooperate with one end of acam lever 26, the other end of theleverbeing adapted to cooperate with a projection 21 carried by the frame 28, journailed on the pivot 38. ,L The' frame 28 is under the fcontrol of thereceiving electro-magnet 29.

The camlever -26 cooperates with a cam 30, and is journalledupon a pin 3I carried by a spring.- loaded lever 32.-

A similarset of lparts is provided in association with each of the remaining .detents I1, I8, I9, 2U and 2|. For' example, learn lever 42 is carried by the pivot pin journalled inthe third arm of detent I1, and the latch face'4l onA cam lever 4-2 cooperates with one end of cam lever 39. VCam `leverA 39 isgjournalled upona pin carried by a spring loaded lever 44. Cani 'levers 42 and 39 cooperate with cams' 45 and 49 respectively. Y 4

Cam lever 39 Vdiffers however from cani lever 26 in that the former co-operates with theframe 28 and not with theV frameextension 21. ',The cam levers associated with the other detents and corresponding to cam levers 26'and 39 'co-operate with the; frame 28 similarly to cam lever 39.

Cam lever 23v is provided with an extension 23a, and other' similar `cam levers lsuch as'42 are provided with simi-lar; extensions, all arranged to lbe alcted upon by a common resetting lever 33,. operated by a resetting cam 34. The lever 33 is provided with a pin Y35, which co-operates `with a projection on the common latch I4, which isY pivoted on rod 59 `whereby the latch may be operated when the cam llever 23 and similar cam levers are reset.4 A specialcam 36 is providedV4 for operatingthe normal stop arm I3. A 5-hump cam 31 is provided to move the electro-magnet armature carried by the frame 28 against'the Y poles of the electro-magnet during the receipt of the middle portion of each unitof the code.

The operation of the device is as follows: Upon receipt of a starting signal, the shaft I is clutched to the constantly rotating shaft driven from the driving motor by any well known means (not shown) the typewheel shaft being held by thelever I3' in the position shown, or in a position V180" displaced from the position shown, the detent I3 being held into engagement with one or other of the arms 5 and 6 against the action of spring I5, by means of the common latch member I4; During the receipt of the first unit f the code, the first hump on cam 31 will depressthe frameV 28 `carrying the electro-magnet armature, so as to bring the armature into conf tact Withthe electro-magnet 29. If, at this moment, there is a current flowing in the winding of the electro-magnet, the frame 28 will be held in a downward position; if no current is flowing in the winding, the frame 28 will be released so that it will return to the position shown. Immediately after the operation of the first hump ontheY cam 3-1, when the frame 28 has taken up a-'selected position, the lcams 30 and 49 will act at the samel moment to Ipress forward the cam 25 levers 26- and 39. With the frame 28 in the position shown, i. e. away from the magnet 29, the lower end of lever 26 is clear of the projection 21, so that it will not be held thereby. Consequently, when the cam 30 presses on the hump on the lever 26, the lower end of the lever 26 will move towards the left and the spring 40 will be slightly extended, and the upper end of the lever 26 will remain firmly in engagement with the latch 25 on cam lever 23.

Whilst thel hump on cam 30 is operating cam lever 26,` the hump on cam 49 is operating cam lever 39, the lower end of which is engaged by the'V common member 28, it being assumed that this member is in its upper position. Consequently, the lower end of lever 39 will be held and the upper end will move outwards, so as to becomeV disengaged from the latch 4I carried by cam lever 42, so thatV this lever will be moved in anfupward direction by Aspring 43, thereby preventing Vthe upper end of cam lever 39 from returning toits normal position under the action of spring 43a. It will be observed that spring 43 urges lever 42 in a clockwise direction, thereby producing pressure simultaneously on the upper endv of the lever 39 and on the hump on lever 39 that is in engagement with the cam 49. It willthus be observed that, with the latch member k28 in its upper position, as shown, cam lever 23 is held in engagement with cam 24 by latch member 25 and the upper end of cam lever 26, whilst the cam lever 42 is released, so as to be moved awayy from cam 45, under the action of spring 43. It is clear, however, that, if the common member 28 were in its lower position against the electro-magnet 29, the lower end of lever 39 Vwould be left free, and the lower end of lever into the path of the arm 1 on the typewheel spindle and causing its downwardly extending portion to depress'the common latch member I4, illreby releasing the lever I3, which will be withdrawn from the engagement with arms or 6 ybyV the spring I5. The common latch member I4 will immediately rise to hold the lever I6 in its actuated position.

The common latch member 4 is formed with a knife edge co-operating with the downwardly extending arm of'each detent lever and the knife edge of the latch lies at an angle with respect to the edge of the detents in such a way that detent |6 on rotating in a clockwise direction depresses the latch to an extent sufficient to free detent I3, and similarly any succeeding detent will depress the latch to an extent sulicient to release any previously actuated detent. It should be noted that, with the typewheel held in the i normal position shown, the actuation of detent I6 does not permit the typewheel to rotate except by a very small amount, which corresponds to the clearance provided between the detent |6 and the stop arm 1.

Cam 45 is ineffective on cam lever 42, because this lever has been withdrawn under the action of spring 43 from the path of the hump on cam 45. Consequently, it will be seen that, if the first impulse of the code corresponds to no current in the electro-magnet 29, the common frame 28 will be in its upper position at the moment when the cams and 49 operate, and detent I1 will remain in the position shown in which it is ineffective to arrest the typewheel shaft. 'Ihe typewheel shaft will always be arrested by means of arm 1 and detent I6 if the first code element be spacing. If the typewheel shaft had been resting in a position 180 from that shown by detent I3 coacting with stop arm 6, the shaft 2 iwould be in the circumstances detailed above move into its first selecting position through half a revolution. Similarly, if the first selecting impulse correponds to current in the electro-magnet winding, i. e. is a marking impulse, detent I1 is actuated instead of detent I6 and the typewheel shaft makes either a half revolution or practically no movement at all, depending upon whether it was held by detent I3 being in engagement with-arm 5 or arm 6.

Cam levers 46 and 41, with corresponding cams, are provided for the second unit of the code, and similar levers for the third, fourth and fifth units of the code. In each case, only one pair of levers is provided in contra-distinction to two pairs of levers provided for the rstrunit of the code.

The shaft I also carries the cams required to perform the printing and paper feed functions, the mechanism for which is not shown. This mechanism may be* the same as that described hereinafter with reference to Figs. 1 to 3. After the performance of these functions the cam 34 acts on the resetting lever 33 which restores all the cam levers 23, 42 &c. into positions in which cam levers 26, 39 &c. re-engage the latch faces 25, 4|, &c. At the same time the pin 35 operates the common latch I4 whilst cam 36 operates the detent I3-and all the detents I3, I6, I1, I8, |9,`20 and 2| are restored to the positions shown in the drawings. The shaft 2 is thus freed for rotation, and it rotates until detent- I3 engages stop arm 5 or stop arm 6 whichever it meets rst. As these stop arms are positioned 180 apart the type wheel may be stopped in either of two positions 1809 apart.

. The action of a cam upon lever 26 or one of the correspondinglevers, followed by the action of a cam on lever'23 or one of the corresponding levers, is equivalent totwo degreesfof movement given to a selecting member. The selective release of cam levers 26 or the corresponding cam levers therefore takes place in the middle of the corresponding signal element periods, Whilst the consequent movement of the detent cooperating with the rows of stops may either take place immediatelyA afterwards or the detents may be moved into operative relation with the different rows of stops by cams angularly displaced in a manner corresponding to the degree of movement permitted to the type- Wheel by the respective rows of stops. It is clear also that thedetents I6, I1, I8, I9, 20 and 2| may be actuated under'control of key board operated combination bars in the manner described in British Patent No. 529,983, the detents I6 and I1 being actuated by the same combination bar and one or the other thereof actuated according as to whether the said combination bar is moved into a given position or not. Referring now to Figs. 1 to 3, a horizontal .Y shaft (not shown) is continuously driven by an electric motor and this shaft is provided with gears meshing with gears 4 and 51. Gear 4 drives a type wheel shaft V2 through friction clutch 3 of any well known kind.V The shaft 2 is, however, normally held stationary by one of the stop arms thereon cooperating with a corresponding detent in a similar manner to that described above. Gear 51 is fixed to a shaft |21 on which is also fixed a ratchet dog |28 of a toothed clutch of well known kind. The ratchet sleeve |29 of this clutch is slidably mounted on shaft |21 and coupled to sleevev rotatably mounted aboeut shaft |21 by two ears (not shown). Sleeve carries the cams for controlling the sequence of operations of the apparatus. For the sake of clearness in the showing of Vcertain parts the ratchet dog |28 and sleeve |29 of the toothed clutch are shown in engaged position and the sleeve I is shown as rotated a certainV amount from its normal resting position. The ratchetdog extent longitudinally of sleeve I and in the rest 2 position is urged towards ratchet dog |28 by a Upon the vreceipt of the starting element of n a signal, magnet 29 is de-energized and the armature 28 is vmoved away from the pole pieces by the action of a spring |4|. An extension piece |38 fixed to the armaturev coacts with an arm |31 and moves it clear of a xed stop |36. The arm |31 is vnormally held against stop |36 byV a spring |35 in such a position that a shoulder on the arm |31 prevents longitudinal movement of the arm.v When extension |38- on the armature 28 moves arm |31 the shoulder thereon is moved clear of the stop |36. Arm |31 is attached at one end to a bell crank |6| fixed to a rod |44 mounted for rotation inthe framework of the machine (not shown). When the shoulder on arm |31 is clearof stop |36-.a spring |62 rotates bell crank IBI and rod |44 in a clockwise direction and arm |31 moves longitudinally of itself. The detent |43 above referred to is fixed on rod |44 andV on clockwise rotation of this rod is withdrawn from engagement` with ratchet sleeve |29, which is Athereupon furged'by spring |30 into` engagement with ratchet'jdog |28.

' Sleeve is thus rotated with shaft |21. 5 l f Inthe embodiment shown, the type' wheeljre- |29 is free to move to a limited printing in the position'selected, but is restored to normal position during the period of the start Velement of the next cycle.

into the path of'stop arms5 and 6. The latch I 4 is part of a frame pivoted on a rod (not shown) and one side of the frame is extended to form a bell crank lever 52. Immediately after sleeve I 'commences to move a cam 34 on sleeve I acts on bell crank lever 52 to remove the latch I4 from engagement with any of the detents I 6, II, I8,

I9, 20 or 2| that may be held by latch I4 in engagement with a stop arm on the type wheel The shaft 2 thereupon commences tol shaft 2.

rotate. Cam 34 then releases latch I4 which moves back to hold detent I3 in position. Shaft 2 comes to rest with detent I3 engaging either stop arm 5 as shown or stop arm 6.

A cam 31 on the sleeve I acts on an extension of the armature 28 and towards the close of the start element commences to move the armature 28 towards the poles of the magnet 29. A little before the middle of the first code element of the signal a hollow in cam 3'I allows the armature 28 to be moved away from the poles of a magnet 29 by its spring I4I. If however magnet 29 is now energised it holds armature 28 in attracted position. Y This movement of armature 28 takes place for each code element of the signal, the armature being held attracted by the magnet or allowed to move away therefrom according as the signal element is marking or spacing. The translating mechanism in the embodiment being described is provided with a plurality of sword members'one for each code element constructed and mounted asV described in British Patent 245,149. Two members Bla, 6|b only are shown. "I'hese members are carried by cam levers 62a., B2b reciprocated by cams 63a., 63h.

An extension 66 of the armature 28 is connected to the latter by al spring |40 and is thus moved with it. Extension |56y carries a frame 65 having two depending arms 64; As soon as the position of the armature li'as beendetermined a cam |58 on'sleeve I'movesits cam lever |59 to bring the sword member carried by the cam lever into engagement with` frame 65. 'I'his frame 65 is formed with a knife edge and a knife edge |60 on lever I59`en'gag`es on one side or other of the knife edge on frame 65 to' hold extension 66 and frame 65 in the position they have taken up.v Each of the cams 03a, 63h is in two parts. The lower moves itsrcorresponding sword Ela, E'Ib into engagement with the depending arms 64. If the armature is at this moment held attracted, the left hand projection of the sword member engagesl the corresponding arm 64 and the sword member is rotated in a counterclockwise direction. If the armature at this movement is away fromV the pole pieces, the right hand projection sword member engages the corresponding arm 64 and the sword member is rotated in a clockwise direction.' Y y After asword member has been thus positioned it is moved by the upper cam 63a.,- 63b &c. away from contact with the arms 64'whereupon cam |58 allows lever |59 toY be moved by its spring away from'frame 65, thus leaving thisfframe and vates detent I1.

extension 66 to be positioned in accordance with the next code element. After an interval the lower cam moves the sword member towards a corresponding detent. The sword member Sla for the first element of the code cooperates with two detents I6 and II cooperating with stop arms 'I and 8 on the type wheel shaft. If the sword member 6ta, is set in marking position it actuates detent I6, if in spacing position it actu- Whichever of the detents I6, I'I is acted upon by sword IIa moves latch I4 in a clockwise direction and soy releases detent I3. lTlhe latch I4 is restored to hold detent I6 or I'I whichever has been actuated in new position and all other detents out of the path of the corresponding stop arms. As detent I3 is released the type wheel shaft commences to rotate and according to the relation between the position of the type wheel shaft and the nature of the first code element it is allowed to move only a very small fraction of a rotation or through 180.

Thus, suppose the type wheel to have been arrested in the position shown by the engagement of detent I3 with stop arm 5. If now sword Ila has been set by a marking element and has engaged detent I6, the type wheel shaft is Yalmost immediately arrested by engagement of detent I6 with stop arm 1. It is necessary to allow a small clearance between the positions of stop arms 5 and 1 to make certain that detent I6 will be moved into the path of stop arm I and will not foul the end of the stop arm. 1f, however, sword 6Ia is set by a spacing element and engages detentl I'I the type wheel shaft is allowed to rotate through 180 until detent II engages stop arm 8'.

Suppose on the other hand the initial position of the typewheel shaft to have been 180 from that shown, i. e. detent I3 in engagement will stop arm f6. Thenif detent IB were actuated fora marking element, the type wheel shaft would rotate through 180 until detent I6 en gaged stop arm I6. If detent I'I were actuated bya spacing element, the type wheel would only rotate a very small amount and would be arrested by engagement of detent I1 with stop arm 8.

The sword member SIb for the second code element is moved similarly to sword member 6 a. The sword member 6Ib however cooperates with only: Va single detent I8 which it engages only if it has been set by a spacing element of the code. If the second element of the code be marking sword member SIb is set in a position in which it does not lengage detent I8 and the type wheel shaft is not in that case released.

The sword members (not shown) for the third,

i fourth and fifth code elements co-operate with detents I9, 20 and 2| in the same manner that sword member 6Ib co-operates with detent I 8. Detent I8 cooperates with two stop arms 9, detent ISvwith four Vstop` arms I0, detent 20 with eight stop arms II and detent 2| with sixteen .stop` arms I2.

The reason forV the resilient connection between detent I3 and lever 5I will now be apparent. If the second, third, fourth and fth elements of a code combination are all marking the shaft 2 will remain, at the end of the receipt of such combination, in a position in which lit is held by either detent Is or detent n cooperating with its correspondingstop arm 'I or 8. Stop arm 5'or stop arm 6 will then be in the pathofvw detent I3 and it cannot therefore be pushed into V'operative position. When the I1,v the shaft 2 moves and detent |3 will snap the stop arm against 'e which it has been moved by the spring |65 anfd'v into the path of the stop arm .180 away from it. reference to the 2| ina manner into position just behind The latch I4 is disposedwith detents I3, lo, n, ls, Is; 20 and similar to that in the embodiments previously described. Detent |3 can accordingly be moved past latch I4 at the commencement of a cycle of operations without moving thelatch'far enough to'release any other detentthat` 'is 1'n position, but any detent subsequentlyactuated latch I4 is moved to release detent I9 or detentA Y will release any previously actuated detent.

The periods between the times atwhich the sword members act upon their corresponding detents preferably decrease as `Athe degreeof movement to be executedzby the shaft 2 decreases and accordingly eachsword member is restored y to an intermediate position after b eing set by; the

armature extensionv in whichitj may remain-be-V Y t0 act upon its corresponding..

fore being moved detent.

During the `rotationofba'n1. sleevefljcamj acting on cam lever I3 I graduallyrotates rod I 44 to bring detent `|113 into position to 1re-engage a cam surface on ratchet sleeve |29 Ain ,orderg that it may withdraw this ratchet sleeve from engagement with ratchet dog |28 against theaction v 'Y of spring |36. As rod HUI` rotates, .bell `crank lever |6| rotates with it andwithdraws armV |3`|` from engagement with extension piece |38 .until the shoulder on arm |31 is .in position to err-1.v

-gage fixed stop |36. Near` the endpf `a'. cycle'.

rotation the cam |33 leaves lever;|3|, rod detent gagement of the shoulder on arm ,|31 withfthe Mland |43 free, since they are nowfheld'byeilxed'stop |36. The cam'sleeve I .comes'torest duringthe period of the stop element theratchet.

sleeve` |29 having been withdrawnfrom engage-.

ment with ratchet'dog |28.

YI1; win be seen from Fig. 1 that theerlaaetes" onY the type wheel are arranged in two; rows,

letters in one and figures `and punctuation'marksV inthe other. The particular row of characters* v Y i I 5 with bell crank85. Bell crank 8`|isf0rmed with an upstanding portion 81d. -Thisupstanding portion movesagainst a 'downwardly extending extension 9.0agof ialverh'ifwhich ylever isfnorV 1 mallyresting with an upstanding` eX't'e'nsionSll` thereof againstiixed stopv 93,'.and rotates-'this lever anti-clockwise, extending.. spring. 84. A Lever |3 fi'zfied on pivot rod 91v isconstrained by spring y 921- i3d-follow lever Y9|).v As -trun'nion 88I reachsthe endeof its travel'a'n arm offlbell 'cranklever' 81 meets a,Y `latcl1-89f'and lis .thus rotated YSlightly Clockwise- The epsandmebgiiog 81a it ymoved lclearzof. the downward entensionfajand.lever y90. thus i allowed tortatein'a .clockwise direction .under theaction ofsprin'g 84. extension HI on lever 9|) rotatesY lever |3.Y .As the printing hammer J |50 is-fixed on vrod `|37 it is moved with lever-73 first away from- .the'type wheel and then towardsrit.- YThelcloc'kv'vise movement of lever 981s arrested by the -stop 9 3', but the momentum of lever. I3 and the. printing hammer '|50l carry them on until theprinting. hammer strikes the -ink ribbon. emparer tape against the type wheel. The spring SZdraws'themagain away from the type wheelp-v Thecharacter selected is on two paper` lever A `|2 y pivoted on al fixed pivot (not shown) andgsoremoves itjfrom engagement witha bell crank 95. Bellrank 95 is rotated by spring 96 andpawl '10; rotatesratchet wheel 69 bythe space of onetooth.- Ratchet wheel .69 is `fixed on spindle Gland Ythus the paper isfed by thespace Y of one charactenf Y,

to be presented to the paper tape is determined by shift signals viz: the Letter shift'orthe Figure shift signals.

The. reception of either'. l

shift signal sets the type wheel shaft'2 fin achar'- r acteristic. positionas in the case. of. any. other signal.j.'1he type wheel :|41 is fixed toa sleeve4 6|] splined to shaft`2so as .to rotate.therewith but'free to move longitudinally thereof.v Sleeve 60 carries a plate |52. Once per revolutionof camsleeve I after the rotation of the type-wheel has nished, cam|5'| thereon strikes-'a lever |51v` pivoted at |54, downwardlyand cam |56.'strikes Y a lever |53, pivoted at |55 eupwards-Qlf .Ltter shift has been selected plate |52 is positioned below lever |5I and if Figure shiftfis' selected,- plate |52 is positioned above level` |53; *Incom sequence the sleeve with the typelwheelfwill be raised or lowered. The type'wheel will -bei held in one or other of these positions by.' means of a jockey roller 88, Fig. 2 engaging inl oneor other of two depressions '|9 on the sleeve 6 0.

Printing and paper' feedingoperatio'ns are carried out in the following manner." Whilst the type wheel is being rotated in aecorlance' with? TOOK a frame |34, pivotedon rod |66, ina 0106K:

wise direction. A trunnioln Yon arm 9|b of l the frame |34 rotates bell crank 85 anti-clockv wise on pivot 9|. `Bell crankil'l pivotedlat-86 on the long arm of bell )crank is thus moved vWhen lever 85 is rotated clockwise during the irst. part of the nexty cycle a short extension 15 of this leverengages a p inj-"H Xed lso-bell crank and relatchesit against "-lever |2' v thereby withdrawing pawl 'I3 by thespace of gone tooth.

The inkri'blbon |68 is -fed from a mechanism (not shown) described in United States VPatent No e2l,090,811, the feeding pawl'bei-ng actuated by means .of a 4bell crankA (not shown) moved by arm 9| offrame |34. .g1- f' r When a shiftysignal is ;received, the jockey roller 80 is'. forced out of engagement with the sleevetGIl-.andtlever 118. is; Vrotated `in an anticlockwise direction against spring Lever |8 er1-gages Aa .pin 82a onlatch-BZ and moves this latch. clockwiseout of engagement with; latch 89,-.` :Latch 89 moves anti-clockwise about its pivot 16; 'so that, as' lbelL crank Y8l `moves anti clockwise withlever18,5,"it5willnot be arrested by latchV 89 and will not release'lever 90; The

rapid'movenrient. ofthis lever under the. action` of spring 81| is," therefore. prevented; :and Vno printing or tape feed ensues. 1 5 f Iff-the typewheebbeY moved' infrespon' 'e Ato' .the

endfof the lever into-the! A( Y on theY type hammer, so that the latter-will lloel .arrestedY loefo're'a it reaches Yprinting 'p'osition, but

moved' to bring printing .hammer |58 against the vtype wheel, it strikes a tape will",therefore` befed in w'the' normal manner i but no printing willtakeplacef The machine maybe 'usedfasf the vprinter portion of ay cyphering'machineand'ifit be so usedrx forprinting a cyphered message, it isnecessary to 'insert a space after every ve'characters.

When 'frame |34 is-move'dv in an anticlockwise direction; arm Sla moves a pawl ||5,` Fig. 3 into Y engagement' with a ratchet wheel I|4xed-on4 the same shaft I'I as the normal ratchet -feedl wheel-'69. Ratchet vwheel ||4 is provided with one sixth ofthe number'of'teeth on ratchet wheel 69,'in'the present case four teeth to 24 teethy in'y wheel |'9`: Thus, afterV every ve steps thatr been moved ratchet wheel ratchet' wheel 69' has II5o`to rotate the shaft 61 69y by` an additional tooth.v

astratte devices successively res'spnsive to signal seunce elements arranged; -to arrestthefrslector'unit in selctedr'position, iniudif La first selector stop devic'responiv to `the first selector signal elementA arranged to stop the selector unit initially in eitherone of two positions in axial register with said-intersignal stop positions.

2. A'printingl telegraph receiver as set forth in claim 1,V inrwhich said stop positions are'circumferentiallyjspaced by 180".V Y u 3. A printing telegraph receiver as set forth in claim 1, in which saidy first selector stop device includes two separate rotary stops carried bythe selector unit, andfseparate'detents each engaging lon of said rotarystops.

4. A printing telegraph receiver as set forth in claixn l'. in which each stop position of the inter:- si'gn'al stop device is slightly spaced in advance:

OftheCOrreS'p'Onding `stop position of said first` 201.' selector stop? device 'by a' distance sufficientV tot If the machine`r` is set for any other'condition i than typing a cypher 'messagelacontrol lever disables the mechanism for inserting a space after every ve characters; Thiscontrol lever rotates a spindle ||2 clockwise and by means of levers I and I|3 holds the pawl I I5 from engagement with ratchet I I 4. f

In order that paper tape may be conserved,Y

a device has been provided, whereby when the machine forms part of aftransmitter and receiver' and a local record of transmitted -messages'is-notr required, the paper feedingrmechanism-rnaybef put out of action. This device is associated Vwith the send-receive switch vso that the'- device' can only be operated when the switch isin send position. Cam Figr3'is'mounted-onla spindle, terminated with a knurled-knob IZI-project-V ingfthrough the top platel (notshown) y of thei 35.5;ven1-,- damage to a detent obstructed bya stop permit positive interference-free engagement; upon' operation of the latterY device when the; intersignal stop device is released.

' 5.',A printing telegraph receiver comprising a .rotatable typewheel and mechanism responsive,l to a received signal sequence for rotating the` type wheel into selectedprinting position comprising a rotary selector unit associated with the typel wheel including a series of stops, aY series of-fdetents each associated with a stop, and means responsive to the signal sequence elements for selectively shifting said detents into stop engaging'position, at least one of said detents beingY provided with a yieldable joint arranged to preduring said shift.

6i In a printingtelegraphsreceiver of the type includinga rotatable type Wheel and mechanism` responsive to a received signal sequence for roitatingthe typewheel Vinto selected printing machine. This knobl hastwopositions marked Non-feed and- Fe'ed. When-turned to the L- Non-feedV position, the cam |251acts-on a ro'd"VV |24 supported on a lever |23 pivoted about'rod.`

|56. A lever |20 is fixed on aro'd |22 mountedon leverY |23. Lever |201is normallyheld by spring-I I2I inengagement vwith bell cranktle'ver'82 and when cam |25 acts on rod-|24, lever IN1-rotates' bell crank 82v clockwise against theda'ction of spring 8| and's'o removes thershoulder thereon fromengagement with latch 891 Thisla'tch thus" rotates anti-clockwise, when permitted lto fdo so n by pin 98 on arm 9Ib of frame' |34; andmoves out of the path of bell crank `8`I. The'printingV hammer is then not tripped nor the tape fed during subsequentr` action of the machine. In`

order to ensure that the above arrangement'is inoperative when the machine is receiving'froma distantstation, the spindle IIB is coupledto' the operating rodof the send-receive switch. When this switch is moved into receive position,l

the rodv I I9 is turned clockwise carrying withit-` lever I|1 against the action of -spring-v IIS Rod I I8, xed on lever I I1, is therefore moved againstlever |20 moving it clear ofbellcrank 82, which thereupon returns to normal position.

What is claimed is:

' 1. A'v printing telegraph receiver comprising'a rotatable type wheel, and'mechanism responsive` to a received signal sequence for rotating the type wheel into selected printing position comprising4 a rotary selector unit associated' with lthetype wheel, an intersignal-stop device arranged Ito stopV the selector in either of two positions between signal sequences, and aseries'ofselective stop ciated with" a' given stop; and means; respon'sive to; the signal sequence elements fori selectively shifting said'detents into stop engaging position, a detent actuating member associated with each given'detent, -meansl responsive to a signal eley Vment'for` selectively setting veach actuating member in' and out ,of operative' position; and means forthereafter operating said actuating member,

said'last-mentionedfmeans for'operating the actuatingz members A operating successive members at` ,decreasing time intervalscorre's'ponding to y said decreasing angles.

.'7. Aprinting telegraph receiver asf-set forth in claim 6, including cam means g forvi shifting the detents into stop engaging position.

8;.;A2 printing telegraph receiverias set forth in claim 6, including cam means -forioperating the actuating members. A t

9. A printing ltelegraph receiver' comprisinga rotatable typefwheel, mechanism responsive to a received signal sequencefor rotating theV type wheel into `selected printing-position and meansHV forllongitudinally/shiftingfthe type wheel including a'longitudinally movable: and rotatable type wheelsupport, longitudinallytmovable actuating means adjacent the support,means for movingsaid 4actuating means upon the reception of each signal sequence, andv'meansjresponsive to a signal sequence for shiftinglsaid type wheel support selectively into and out of position for engagement by said actuating member.

10. A printing telegraph receiver for printing ve unit code messages comprising printing mechanism, means responsive to successive received signal sequences for selectively actuating the printing mechanism to print a character for each sequence, means for feeding a. tape past the printing mechanism by steps corresponding to the receipt of signal sequences, and means for automatically feeding the tape an extra step after the printing of five characters thereon.

11. A printing telegraph receiver as set forth in claim 10, in which the tape feeding means comprises a ratchet, anY associated pawl, means for actuating the pawl once for each signal sequence received to advance the tape one step. a second ratchet, an associated pawl, and means actuated at the end ofeach signal sequence for operating the second pawl to advance the tape an additional step.

12.V A printing telegraph receiver as set forth in claim 10, in which the tape feeding means comprises a ratchet, an associated pawl, means for actuating the pawl once for each signal sequence received to advance the tape one step, the extra step feeding means including a second ratchet and an associated pawl, and means for disabling the second pawl and thereby eliminating automatic spacing between code units.

REGINALD DENNIS SALMON;

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