US2331952A - Printing telegraph apparatus - Google Patents

Description

Oct. 19, 1943. J, Z NN R 2,331,952-

PRINTING TELEGRAPH APPARATU S Filed Nov. 6, 1941 2 Sheets-Sheet 1 INVENTOR.

WALTER J. ZENNER m B Y c DLC H 'A' ORNEY,

Oct. 19, 1943. w. J. ZENNER 2,331,952

PRINTING TELEGRAPH APPARATUS Filed Nov. 6, 1941 2 Sheets-Sheet 2 FIG.4 4

INVENTOR. WALTER J. ZENNER A ORNE-Y.

Patented Oct. 19, 1943 PRINTING TELEGRAPH APPARATUS Walter J. Zenner, Des Plaines, 111. assignor to Teletype Corporation, Chicago, 111., a corporation of Delaware Application November 6, 1941, Serial No. 418,009

Claims.

The present invention relates to prihting telegraph apparatus and more particularly to recomers responsive to iso'chron'ous code signals having a single Selective current impulse.

The principal object of the present invention is to provide all emeient age printer of Simple construction operable upon the start-Stop principls and comprising a minimum Of operating par A feature of the invention is to provide a page printing apparatus having a single selector magnet which controls a cam printing mechanism to produce a printed record in response to equal length code signals, each composed of two elements of o posite signaling characteristics whose individual time intervals are variable but complementary, so that their summation in each code signal is equal to a predetermined time con- 's'tant.

In accordance with the present invention, the line signal for each character consists of a nocurrent starting impulse and a current definitive impulse. in the event that signal elements of opposite polarity are employed. the starting irn= pulse will be of positive or negative current, and the definitive impulse will be of negative or positive nature, respectively. Specifically, each code signal is composed of two signal elements in which each signal element occurs but once in a code signal. elements in each node signal is constant, and a1 though each element varies in length, nevertheless each element in each code signal is the coinelement of the other element of that particular code signal. Hence, each signal is formed and each character is determined by the relative length of the elements composing the code signal.

Upon the reception of the starting impulse, a selector magnet, which is normally energized since the idle condition or the line is of marking or current nature, releases its armature to control a power clutch; thus permitting a type wheel to rotate, in phase with a controlling element in 'a remote transmitter. During the rotation of the type wheel; the selector magnet, upon deter mination of a starting impulse which occurs si-- muItaneQusI with thebgiiihihg of the definitive impulse of opposite polarity or current condition, again becomes energized and attracts and operates its armature, which action serves, in the preferred form of the invention, to actuate a cam printing mechanism to efiect printing at the instant when the reversal or signaling condition occurs in the one signal cycle. In

The sum or the lengths of the other words, the receiving magnet, upon a reversal of signaling conditions, during the rotation of the type wheel, which occurs at the termination of the starting impulse and the beginning of the contiguous definitive impulse, attracts its armature and causes a printing hammer to operate to print a character. After printing has been effected, the type wheel is released and continues to rotate and is stopped as it completes one revolution.

A better understanding of the invention may be had from the following description taken in conjunction with the accompanying drawings, wherein like reference characters designate similar parts throughout the several views, and in which,

Fig. 1 is a graphical representation of the type of the code signal employed in operating the printer according to the present invention;

Fig. 2 is a perspective view of the printer, viewing the structure from one side thereof;

Fig. 3 is a perspective view of the printer, viewing it from the opposite side;

Fig. 4 is a side elevation of the printer showing the character selecting mechanism;

Fig. 5 is a side elevation of the printer showing the character spacing and line feeding function mechanism, and

Fig. 6 is a cross-sectional view of the printer showing the type wheel mechanism and the page guiding apparatus.

There is indicated in the graphical representation illustrated in Fig. 1 a sequence of monopulse isochronous code signals representative of alpha;- bet characters, for example, G and N. All code "signals according to this code are of equal length, each code signal consists of two elements of different signaling characteristics; for em ample, current-no current, difierent potential or difierent polarity, and each code signal comprises only a starting condition or selecting impulse A and a contiguous definitive condition or impulse B. The point at which the reversal of the current or characteristic nature of the code signal occurs is determinative of the identity of the character to be printed and is the point at which printing is effected. The stop interval between signals is indicated D in Fig. 1 and is of variable duration.

Having reference to Figs. 1 and 2, the printer structure comprises side plates II and I2 which are mounted on a base plate l3, and are main tained in a predetermined spaced relation parablel to each other by spacer rods l4, l5, and I6 (the end only of rod [6 being shown in Fig. 3).

As indicated in Figs. 2 and 3, a motor H is shown mounted on the side plate H by means of posts l8 and i6. A third post is also provided for mounting the motor H which post is not shown in the drawings. It is, of course, understood that the motor I1 may, if desired, be mounted on the basej plate l3. It is necessary that the speed of the motor at the receiving station be regulated so that the type wheel of the printer rotates substantially in phase with a controlling element at the transmitting station.

Upon the armature shaft 26 of the motor I1 is secured a pinion gear 2| which meshes with a drive gear 22 carried on a shaft 29 suitably journaled in ide plates H and I2. The gear 22 is connected to the shaft 29 by means of a friction clutch comprising a pair of discs of frictional material compressed between the flange of a flanged collar 23 and an indexing wheel 24. Compression is imparted to the friction clutch by a compression spring 25 positioned between the collar 23 and a nut 26 screwed onto the end of shaft 29. In this manner, the shaft 29 upon which the type wheel 21 (Fig. 3) and indexing wheel 24 are fixed is given a normal urge to rotate.

A selector magnet 3| is carried by a bracket 32 mounted on the side plate I I. An armature lever 33 is associated with magnet 3| and is carried on a pivot shaft 34 secured to the side plate Armature lever 33 is provided with an arm 35 (Fig. 4) to which is pivotally connected a depending pawl member 36. Pawl 36 cooperates with a ratchet wheel or printing cam 31 and is normally urged into engagement with the cam teeth of the printing cam 31 by means of a spring 38 distended between pawl 36 and lever arm 35. The cam 31 is mounted rotatably on stud 39 fixed to the side plate Upon the de-energization of magnet 3|, the armature 33 will be released and will rotate slightly in a counterclockwise direction about pivot 34 under the action of a spring 4| against an eccentric stop member 42, which provides an adjustable stopping means for the armature lever 33. As the armature lever 33 is thus released, the pawl 36 is thereby raised, so as to engage the next tooth on the ratchet cam 31 so that when the armature 3| is again energized and the armature lever 33 is attracted, pawl 36 will have downward movement imparted to it which will cause the cam 31 to be stepped one angular step in the clockwise direction.

Associated with the cam 31 is a printing control lever 43 which is pivotally mounted on the I side plate H by means of a pivot 44. The printing control lever 43 is provided with an arm 45 terminating in a V conformation whereby it cooperates with the cam teeth of the cam 31. The printing control lever 43 is also provided with a lug 46 which cooperates with the notches of the indexing wheel 24. The printing control lever 43 is provided with a spring distended between lever 43 and a spring post on side plate I whereby arm thereon is held into cooperative engagement with the cam 31.

Pivotally supported on the pivot 44 and disposed on the inside of side plate II is one end of the printing bail 41. the other end being correpsondingly pivoted at 59 to the side plate I 2 (Fig. 2). On its arm adjacent the plate H, the printing ball 41 is provided with an eccentric stop 48 (Fig. 4) which extends through an aperture in the side plate I l into cooperative relation with the printing control lever 43. In this manner,

when the ratchet printing cam 31 is actuated stepwise to cam out the print control lever 43 through the instrumentality of the projection 45 and the lever 43 is actuated counterclockwise against the action of its spring 46, lever 43, through the instrumentality of said eccentric stop 48, will impart corresponding rotation to the printing bail 41 against the action of its retractile spring 49 (Fig. 3) to cause the printing bail 41 to strike against the periphery of the type wheel 21 to effect the printing of a character upon the record material inserted therebetween.

The armature lever 33 (Fig. 4) is provided with an extension 5| at its free end, which cooperates with the free end of a stop-start lever 52 pivotally supported at 53 to the upper end of an orientation member 54, which is pivotally mounted at on the side plate Stop lever 52 is provided with a lateral portion or projection 56 which is directed toward the index wheel 24. Secured to the index wheel 24 and directed toward the side plate H is a projecting member 51, which cooperates with the projecting portion 56 of the stop lever 52. When the selector magnet 3| is energized, and the armature lever 33 thereof is pulled in its clockwise or attracted position against the action of its spring 4|, the end 5| depresses the free end of lever 52 and urges said lever 52 in a counterclockwise direction about its pivot 53 against the action of spring 58 to bring the stop projection 56 into the path of the clockwise revolvable stop lug 51. In this manner, the shaft 29 to which the indexing wheel 24 is fixed, is held against rotation, while the gear 22 continues to rotate due to the friction clutch with which it is cooperatively related to shaft 29.

For orientation purposes the lever on index arm 54 may be rotated about its pivot 55 upon the loosening of the clamping screw 6| whereupon the stop lug 56 may be moved rightwardly or leftwardly to change the stopping position of the stop lug 51 to correspond to the reception of the start-stop code signals. Upon the de-energization of the selector magnet 3|, the armature lever 33 is released and responds to its spring 4| to be rotated counterclockwise against the stop 42. As the result of this movement, the end 5| is lifted away from the free end of the stop lever 52, which is then free to respond to the pull of its spring 58 to cause said lever 52 to rotate clockwise about its pivot 53 thereby moving the stop lug 55 out of the path of the stop lug 51, thus permitting the shaft 29 to rotate.

Slidably mounted on the shaft 29 is the type wheel 21 (Fig. 3). To impart rotation to the type wheel 21, the shaft 29, between the side plates H and I2. is of square conformation and fits into a square hole in the type wheel 21. The type wheel 21 is moved along the shaft 29 through the instrumentality of a U-shaped bracket 63 carried slidably on an auxiliary shaft 64. Bracket 63 is provided with a vertical arm 65 (Fig. 6) which terminates in a forked end and fits into a groove integral with the hub of the type wheel 21, whereby as the bracket 63 is moved along the shaft 64, as will hereinafter appear, the type wheel 21 will be urged correspondingly along its shaft 29 by means of the articulation of the arm 65 with the hub of the type wheel. Secured to the bottom of the bracket 63 is a thin metal strip 65 which extends upwardly and is interposed between the type wheel 21 and the printing bail 41. In registry with the printing zone, the strip 66 is suitably apertured so as to permit printing to be effected therethrough and to prevent smudging otthe printed record. Also pivoted on the shaft 64-isa bracket 61 which carries an inking rollertt thebrack et. 6! being spring urged. by a spring. (not shown. but which is;wound around the. shaft 64) in suitablemanncr "to bring the inking roller 68 constantly into contact with the peripheryotthe type wheel 21.

To accomplish the: functionof character spacing, a cable H is secured tothebracket 63; and extends around a pulley 12 (Fig; 5) carried: on a bracket 13 secured to the; side plate l-2. The side plate I2 is apertured adj'acentto pulley 12 to. permit the passage or the cable H therethrough which is then directedfrom the pulley 12 to the groove in the periphery of a grooved pulley M which is rotatably mounted on the side plate l2 by moment a studio, Also mounted on; stud 15' and secured to. the: pulley Id-by means of the screws T6 is" a spacingratchet. 11. operating with the ratchet Tl is a pawl l'-8 which is: pivotally carried on the extremity of the de pending arm of a. bell crank. lever 19 pivoted on a common stud 81: secured to the side plate 12. The horizontal arm of the bell crank 19 cooperates at its extremity with alcam 2B fixed to the shaft 29. According. to the start-stop principle of operation of the printer herein described, the shaft 29 makes one revolution for each char acter signal, and correspondingly the cam 28 also makes one revolution to, operate the bell crank 19: once for each Character printed. The cam 28 is shown in Fig, 5 substantially in. its stopped position wherein it can be seen. that the spacing; operation occurs substantially atlthe end of the printing. cycle of operation; As the-shaft 29 is released for rotation and the cam. 28: thus is initiatedinto rotation, the cam 28 after traveling substantially 240 begins; to rotate the bell crank lever 19 clockwise against the action ofits spring 82? thus urging. the pawl 18: leftwardly (as viewed in Fig. 5) to pick up the next or following tooth of the ratchet. wheel H. The pawl. i8 is normally urged. into. cooperative relation. with the teeth on the ratchet. wheel llby aepring. 83 distended between a projection on the .pawl lever 78 and. a projection on. the. bell crank lever it: so that clockwise rotation, is. normally. imparted to the pawl lever 1-5; After the cam 28 has rotated substantially 360", the" bell crank. lever T9: is allowed to drop. off the high part of the cam whereby the spring 82 effects the counterclockwise. rotation of lever T9 to; im-

part thereby rightward movement to the pawl 18 which will cause theratchet. wheel. 11 to rotate the pulley 1.4 step-by-step until: the type wheel a and its carriage has reached the endzof' the line; whereupon the carriage return signal is received to. cause the type wheel to: return,. as will be presently described, to the beginning-of-line position. Of course, it is understood that the carriage return signal may be received at any time in the line so that a full winding of the cable ii about the pulley 14 does not always occur.

To effect the carriage returnoperation, mechanism is provided for disengaging, and holding disengaged, the feed pawl 18 and thedetent pawl 84 which is pivotally mounted on stud 85 on the side plate L2. The detent pawl 34 is normally biased into cooperation with the teeth oi the ratchetgwheel H by a spring 86. Having reference, to Fig. 2, the shaft 29. is provided at;its end adjacenttotheinner face of the side plate l2 with a pin 9i for-controlling the carriage return operation. Pivotally carried on pivot 92 secured to a bracket 93-fixed to the printing bail 41 is a lever 94, the lower end of which is conformed to cooperate with the pin. 9! inabuttin-g relation under certain operating conditions in-' dicative ofthecarriag return function. The upper end of lever 94 has pivotal articulation with a stud 95 which extends through. an aperture 961 in the side plate l2, and-is fixed to the upper end of a trip lever 91 pivoted on a stud 98- afiixedto the outer side of side plate l2 (Fig. 5). The lower end oflever 91 is adapted to have latching relationship with a shoulder 99 formedona lever HM, whichis ivoted on the common. pivot stud 8! on which the bell. crank 'H-isalso pivotally mounted.- Lever IiH isnor mally biased in a counterclockwisedirection by aspring H32 distended between. the extremity of lever l'lll andla stud Hi3 fixed to the side plate. l2.

As the carriage spacing mechanism comprising the pulley it operates to move the type wheel 27- fromcthe side plate H to theside plate !2; a car-- riage return spring I'M is tensioned. One end ofv the carriage return spring IE4 is anchored at N35 to the sideplata L2,. and tothe other end ofthe carriage returnspring Hi4 there is fastened one end of a cable lil5-,-the other endof which is adapted to be wound around the hub in? of a wheel-and-axle arrangement I08 rotatably mounted at H19 (Fig-.- 4') on the side plate I I-.- Securedto the sheave portion of the wheel and axlemechanism I081. is one end of a cable Ill. (Fig.- 4) which is adapted-to be woundaround thesheave portion oi pulley Hi8; and which extends; as shown in Fig. 4, around a smallpulley H-Z positioned.- in an aperture- H3 in the side plate I], whereby the-cable IH- passes through the side plate l-I andlis attached to the U-shaped' bracket 63 which carries the type wheel 21-.- As the; type-wheel mechanism is steppeda along the shaft 29 trom side plate H to side plate l2 by the. character spacing. mechanism through the instrumentality of pawl 78' and ratchet 11, the spring I04" is tensioned by causing the cable li t to be unwound from: the sheave portionof the wheel: and axle mechanism t08 and the cable Hi6 to be wound: upon the-hub portionv I01 thereof, With the carriagereturn arrangementshown; the cable Wit-moves substantially one-third the dis tance that thecable T I moves for each character spacing, operation thus providing a very compact tensioning arrangement.

To achieve the carriage return operation the carriage return signal is received by the selecting magnet 32 and is :oil suchnaturethat, having ref-'-- erence; to Fig. 1, the: portion A of the signal (which is the portion ofspacing nature)- is 0t short duration, as is exemplified by the relative position between. the-pin 9| and thelower endoi the-lever 94in Fig. 2c The'angular'positionnient between these two elements indicates that between the initiation ofrotation of shaft 29 and theinstant ofregistry of the pi'n 94 withthe lower end of lever. 94, a short time interval. has elapsed whereuponv the marking portion of the code-sig nal isimpressed on the signal line to energize the magnet 31.. Normally, for ordinary cl iaracterv printing operations, upon the energization of magnet 3| in; response tothe marking: portion of the code signal, as shown inFig- 1,.theenergiza tion of. the selector magnet- 3l will cause the operation of thearmature lever 33 in a clockwise direction (as viewed in Fig. 4) to cause, through the print control lever 43, the actuation of the printing bail 41 counterclockwise (as viewed in Fig. 2), and the lever 94 is caused to rotate about the fulcrum pin 95. However, during the carriage return operation, the marking portion of the signal is received when the pin 9I is in registry or blocking relation with the lower end of the lever 94 so that when the printing bail 41 is actuated by the print control lever 43 the lower end of lever 94 abuts the pin 9| and causes the lever 94 to rotate about the pin 9! as the fulcrum thereby imparts motion to the fulcrum pin 95 which is fixed to the lever 91, and hence the lever 91 is caused to rotate about its fulcrum 98 in a counterclockwise direction (as viewed in Fig. 5) against the action of its spring II2 to cause the bottom end of the lever 91 to become disengaged from the shoulder 99 from lever IBI. Lever IOI is now free to respond to the urge of its spring I02 and is thereby rotated in a counterclockwise direction. Pivotally connected to lever IUI and depending therefrom is a pawl arm I I3 which is normally biased in a counterclockwise direction by a spring II4 extending between the lever H3 and the extremity lever of IIII. Lever I I3 is provided on the side confronting the side plate I2 with a stud I I which cooperates with the detent pawl 84 so that when the lever IOI is permitted, through the disengagement of the lever 91 from the shoulder 99, to respond to the pull of its string I02, this movement is imparted to the lever II3 which, through stud I I9, imparts clockwise rotation to lever 84 against the action of spring 86, thereby releasing the detent pawl 84 from the ratchet wheel 11. The free end of the pawl arm 84 cooperates with an overhanging projection I I5 integral with the feed pawl 18.

When the pawl 84 is raised by the stud IIiI, its end will cooperate with the end II5 of lever 18 to disengage the pawl 18 also from the ratchet wheel 11. The pulley 14 is now free to respond to the pull of the carriage return spring I04, which by rotating the wheel and axle arrangement I98 causes the cableI II to be wound upon the sheave portion of the arrangement I88 while the cable I 06 is unwound therefrom. In this manner the tpye wheel actuating bracket 83 is caused to be moved from the side plate I2 to the other side plate II, thereby unwinding the cable II from the pulley 14. To maintain the pawls 18 and 84 in their disengaged position during the carriage return operation, a laterally disposed lug or projection H6 is provided on the detent pawl 84. As the ratchet wheel 11 is rotated during carriage spacing operations, a stud II1 carried thereon is also caused to move therewith so that it moves away from the lever II8 pivoted at II9 to the side plate I2 (Fig. 5). As this occurs, spring I2I causes lever II8 to be biased counterclockwise to bring its extremity to bear against the lug II6 of the detent pawl 84. Now, as the stud II1 recedes from the lever H8, and the lever 84 is raised by the stud Hi], the lever I I8 through its shouldered extremity acts to hold. through the projection II6, the lever 84 latched against downward movement by its spring 86. In this manner, the pawl arms 18 and 84 are held disengaged from the ratchet wheel 11 during the carriage return operation. However, at the completion of the carriage return operation, the pin or stud I I1 on the ratchet wheel 11 returns to its position adjacent the lever H8 and is stopped thereat by the hook portion I22 of said lever I I8.

The inside surface I23 of hook portion I22 is so contoured as to cause a budging action between the stud H1 and the lever II8 to impart a slight clockwise motion to the lever II8 against the action of spring I2I to insure the disengagement of the shouldered extremity of lever I I8 from the lateral portion IIB whereupon the spacing pawl 18 is returned into engagement with the teeth of the ratchet wheel 11 by spring 83, and the detent pawl 84 is returned into engagement with the teeth of the ratchet wheel 11 by spring 86. The beginning-of-line condition of the printing mechanism is as shown in Fig. 5.

The lower end of the line feed pawl H3 is proided with a hooked portion I24 and a lateral guiding portion I25. The hooked portion I24 cooperates with a, ratchet wheel I26 fixed to shaft I21 journaled in the side plates II and I2. The ratchet I26 is fixed to the shaft I21, and also fixed to the shaft I21 and disposed between the side plates II and I2 is a guide roller I28, Figs. 4 and 6. The guide portion I of the line feed pawl I I3 cooperates with the guide member I23 (see Fig. 3) secured to the side plate I2. A jockey roller I3I is mounted on a spring I32 fastened to a bracket I33 secured to the side plate I2 whereby the line feed ratchet I25 is held or detained in its operated position. The side plates II and I2 are provided with bearings for a shaft I34 which carries a paper roll I35 (Figs. 3, 5, and 6) on which a paper web roll I36 is carried. Cooperating with the guide roller I28 are a pair of pressure rollers I31 located one at each extremity of the roller I28. Pressure rollers I31 are carried on suitably supported brackets I38 and are spring biased by spring I39 against the guide roller I28. The paper I36 is passed around the chute I 4| and thence between the pressure rollers I31 and guide roller I28 and up along the guide I42 through the printing zone between the printing bail 41 and the spring member 66, thence out of the printing mechanism. Thus, during each carriage return operation, the line feed operation is performed simultaneously, since upon the upward motion of the pawl I I 3 not only are the detents 18 and 84 disengaged from the ratchet wheel 11, but also, the line feed ratchet I26 is operated by the pawl II3 to efiect a line spacing or feeding operation of the paper web I38 from the roll I35.

The cam 28 not only spans the bell crank 19, but also is wide enough to act upon the lever IIlI so that at the completion of the revolution of cam 28, said cam will operate upon a shoulder portion I43 of lever Ifll to depress the lever IGI, or rotate it clockwise against the action of its spring I02 to permit the reengagement or latching of the lever 91 with the shouldered portion 99 of lever IOI, whereat the lever I0! is held until a subsequent carriage return signal is received. The shaft I21, as shown in Fig. 3, is extended beyond the side plate I2 and carries at its extremity a hand wheel I44 for manual line feeding operations.

General operation Before beginning operation of the printing apparatus herein shown, the orientation index pointer 54 is manipulated so that the stop lug 56 of lever 52 is properly adjusted to efiect substantial synchronization with the received signals, after which the index arm 54 is properly clamped in place. The normal operating condition of the line is a marking or current condition whereby the selector magnet 3| remains energized, and the stop lug 56 is presented into the path of the stop lug 51 thereby holding the type wheel shaft 29 quiescentwhile the gear 22 constantly rotates. It is assumed that the type wheel 21 is positioned at the beginning-of-line position preparatory to printing a, new line.

Due to the nature of the isochronous code sig nal employed in controlling the operation'ofthe printer according tothe present invention, the commencement of the start impulse causes the selector magnet 3'I to be de-energized andlper mits spring 3| to actuate the armature lever33 to its counterclockwise position against. the stop 32, but in response to thismovement of arma= ture lever 33, stop lever 52 is removed by its spring 58 from engagement withhstop lugil, permitting the shaft 29 and theelements controlled thereby to rotate.

By this action of armature lever 33, the pawl 36- is moved into engagement with the next tooth on the printing cam 31. At an instant in the cycle of rotation of shaft 29 determined by the particular character to be printed and evidenced by a reversal of the current in the line, the magnet 3| becomes energized and instantly effects the movement or attraction of its armature lever 33, thuscausing, due to the action of pawl: 36 upon printing cam 37! and consequently the action of cam 3! upon print control lever-43, and in turn the action of the lever #3 upon the stud 48-, the printing bail 31 to swing toward the type wheel 2 and press the page material I36- against the character. selected. The projection 46 on the print control lever 43 acts-on the indexing wheel 24- to arrest the type wheel momentarily from rotation. While the shaft 29 is thus rotating, the cam 28 is also operating andtoward the end of the cycleof rotation, cam 23 operates upon bell crank lever 19 to rotate, through feed pawl I8, the ratchet wheel "IT to effect character, spacing, in the ,manne'rflpre viously described.

This procedure continues until the carriage return signal is received, whereupon in response to the carriage return signal the magnet 31' is first de-energized momentarily, causing the type wheelshaft 29 to rotate as previously described, and thereafter causing the selector magnet'3l to be again energized upon a reversal of current in'the lineat the=-instant when pin 9| is in registry or blocking relation with the lower end of lever 94. The energization of magnet 3I at this time causes, through lever 43, the operation of the print bail 4'! and hence lever 94 to cause lever 94 to rotate clockwise about its pivot 92 to swing the latch lever 9'! out of latching relation with lever IllI, thereby permitting spring I02 to operate lever IUI to raise the line feed pawl H3, and through stud III] raise the detent lever 8.5 and feed pawl 18 out of engagement with the character spacing ratchet 'I'I thereby permitting the ratchet IT to rotate in a counterclockwise direction until the stud II'I thereon strikes against the hooked portion I22 to release or disengage the lever H8 from the portion H6 and in the meantime concurrently with the carriage return operation, the pawl II3 operates to rotate the line feed ratchet I26 clockwise (as viewed in Fig. to efiect the line feeding operation, after which the printing apparatus is in position for another line of printing.

What is claimed is:

1. In a telegraph page printer, a start-stop shaft, a type wheel carried thereon, means responsive to the first portion of a received signal for starting rotation of saids'liaft and responsive to the second portion of said signal for i'estorring stop conditions tdtikidslieift, means for advaneirigsaia type wheeialorigsaid shaft to ro= diio character -paes,...and a printing bail, co"- extensive with the total movement of said type wheelon saieshaft, operablepy said first means in response to said second portion of said receivd signer 2:11: a telegraph page-printer, astart-s'top short, a cam printing means, asingie magnet responsive to equal length code signals, each signal comprising sir-start Go'fiditipnafid a Stop condition or complementary periodic lengths, means to perform character spacing,- and means resprmsive to the start condition of asignal for initiating rotation ofsaid shaft and simul taneously preparing said'printing means for of festive -operation,- and subsequently responsive to the transition from start to stopvconditionlto effect initially the camming .of-saidt rintmg IiiasHSySEGGllidl-Y operation of said character spacing means and subsequently; the ar'iestment of said shaft.

3i In: a telegraph page printer responsive to isochronou's nronopu lse code: signals comprising arr initial portionanda definitive portion-a starts-stop" shaft, aatyp'e wheel carried thereon, aprinting :ba-i'l, means responsive to: the initial portion of said signals to release. said: shaft for rotationto: condition said typewheel to. perform printing operations, means effective upon the transition from saiciinitia pa ties-to th efinitive-sort n lo saideeiena t ene a e's i to consummate "the pr ntin ope at on s ac hanism fo am ss n sai type whee alone a dsh t'te prod e-ch racte ;sp es; d, ans carried bysaid shaft effective in response to said release of said shaft and subsequent-topaid printingloperationto effect the operationlof; said spacing mechanism.

4.311% 3; pager-printer; asir rgle magnet responsive -toequal length code signals, each signal comprising a firstconditionand a: second c"on.- dition ,of corriplementary, peribdiollengths, pawl and ratchet printing means, indexing means for said printing means responsive to said firsmorrdi'tion ror'pre par g. for action, rhfelir'isie fifctiv' v from said first to" said second condition to" earn said printing means to effect, under the control of said indexing means, the printing operation, means to form character spaces operative as an incident to the printing operation, and carriage return means directly controlled by said printing means.

5. In a telegraph page printer, a start-stop shaft, a cam printing means, a single magnet responsive to equal length code signals, each signal comprising a start condition and a stop condition of complementary periodic lengths, means to perform character spacing, means responsive to the start condition of a signal for initiating the rotation of said shaft and simultaneously preparing said printing means for effective operation, and subsequently responsive to the transition from start to stop condition to effect initially the camming of said printing means, secondly the operation of said character spacing means and subsequently the arrestment of said shaft, a first instrumentality associated with said printing means, a second instrumentality associated with said start-stop shaft, carriage return means, and means efiective under certain predetermined operating conditions through the 00- operation of said instrumentalities to enable the operation of said carriage return means.

6. In a telegraph printer, a start-stop shaft, a cam printing means, a single magnet responsive to equal length code signals, each signal comprising a start condition and a stop condition of complementary periodic lengths, means to perform character spacing, means responsive to the start condition of a signal for initiating the rotation of said shaft and simultaneously preparing said printing means for effective operation, and subsequently responsive to the transition from start to stop condition to effect initially the camming of said printing means, secondly the operation of said character spacing means and subsequently the arrestment of said shaft, a carriage return control instrumentality, a sensing member pivotally carried by said printing means and articulated to said instrumentality, a fulcrum member associated with said start-stop shaft, and carriage return means effective under certain predetermined operating conditions through the cooperation of said sensing member and said instrumentality.

'7. In a telegraph printer, a start-stop shaft, a printing means, a single magnet selecting means responsive to monopulse code signals to select a character to be printed, character spacing means, means controlled by said selecting means to effect sequentially the initiation of said shaft for rotation, the operation of said printing means, the operation of said spacing means and the arrestment of said shaft, a carriage return control instrumentality, a sensing member pivotally carried by said printing means and articulated tosaid instrumentality, a fulcrum member associated with said start-stop shaft, and carriage return means effective under certain predetermined operating conditions through the cooperation of said sensing member and said instrumentality.

8. In a telegraph printer, a start-stop shaft, a printing means, a single magnet selecting means responsive to monopulse code signals to select a character to be printed, character spacing means, means controlled by said selecting means to govern sequentially the initiation of said shaft for rotation, the operation of said printing means, the operation of said spacing means and the arrestment of said shaft, a carriage return control instrumentality, a sensing member pivotaliy carried by said printing means and articulated to said instrumentality, a fulcrum member associated with said start-stop shaft, carriage return means effective under certain predetermined operating conditions through the cooperation of said sensing member and said instrumentality, detent means for facilitating the completion of operation of said carriage return means, and cam means associated with said detent means for controlling the restoration of said carriage return means to its operative condition.

9. In a telegraph page printer, a start-stop shaft, means responsive to the first portion of a received signal for starting rotation of said shaft and responsive to the second portion of said signal for restoring stop conditions to said shaft, a type wheel, means for advancing said type wheel along said shaft to produce character spaces, carriage return means, a printing bail, coextensive with the total movement of said type Wheel on said shaft, operable by said first means in response to said second portion of said received signal, a first instrumentality associated with said printing means, a second instrumentality associated with said start-stop shaft, and means effective under certain predetermined operating conditions through the cooperation of said instrumentalities to enable the operation of said carriage return means.

10. In a telegraph page printer responsive to isochronous monopulse code signals comprising an initial portion and a definitive portion, printing means including a typing instrumentality, means responsive to the initial portion of said signals to initiate operation of said printing means, means effective upon the transition from said initial portion to the definitive portion of said signal to consummate the operation of said printing means, spacing mechanism, means to operate said spacing mechanism to effect character spacing movement of said instrumentality, and means effective in response to said initiation of operation of said printing means and subsequent to said consummation of operation of said printing means to effect the operation of said spacing mechanism operating means.

WALTER J. ZENNER.

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