US2239721A - Printing telegraph apparatus - Google Patents

Description

FIGJI April 29, 1941. H. L. KRUM 2,239,721

PRINT ING TELEGRAPH APPARATUS Original Filed Dec. 30, 1936 3 Sheets-Sheet 1 INVENTOR HOWARD L. KRUM ATTOR Y April 29, 1941.- H. KRUM 3 PRINTING TELEGRAPH APPARATUS I Original Filed D80. 30, 1936 3 Sheets-Sheet 2 F IG. 2

INVVENTOR HOWARD KRUM ATI'ORNE April 29, 1941. H. L. KRUM 2,239,721

PRINTING TELEGRAPH APPARATUS Original vFiled Dec. 30, 1936 3 Sheets-Sheet 3 INVENTOR HOWARD L.KRUM

ATTORNEY Patented Apr. 29, 1941 P'RKNTING TELEGRAPH APPARATUS Howard L. Krum, Beverly Hills, C'alif., assignor to'Teletype Corporation, Chicago, 111., a corporation of Delaware Application December 30, 1936, Serial No. 113,237 Renewed February 26, 1940 30 Claims.

The present invention relates to printing telegraph apparatus and more particularly to telegraph apparatus wherein characters are" printed upon a tape.

' The principal object of the invention is to provide a simple, efficient, and relatively inexpensive printing telegraph machine operable under the control of permutation code combinations of signaling conditions.

According to the present invention, there are provided selectable instrumentalities controlled by'a single magnet selector mechanism, which, in turn, control the operations of type wheel and printing mechanisms. main'op'erating shaft, which is connected to the motor for continuous rotation therewith, a sleeve operatively connected to the shaft through a ratchet or grab clutch mechanism, said sleeve carrying a set of code discs which are fixed thereto, as well as a series of cams, a driving ratchet, anda type wheel. The code discs are notched in permuted manner determinative of the positions of the characters on the type Wheel so that when a series of seeker levers, permutably selected by means of a single magnet pin barrel selector, are

actuated simultaneously, upon finding an alignment of wards and notches corresponding to the permuted arrangement of said levers, a printing mechanism is operated at the proper time to effect printing in accordance with the received 7 character signal.

,In one form. of the invention, the type wheel is fixed to the aforementioned sleeveand has associated therewith aratchet wheel, also fixed to said, sleeve, and cooperative with said ratchet wheel is a. spring actuatedpawl, which when released, is biased toward the ratchet wheel to be impulsively actuatedtherebyto efiect, through interconnecting linkage, the inpingement oi a platen against the type Wheelto produce printmal stop position, with the blank portion of the type wheel presented to the printing hammer.

The above andother objects of the invention will be apparent from the following description when taken in conjunctionwith the accompanying drawings, wherein like reference characters There is mounted on the p designate similar parts throughout the several views; in which- Fig. 1 is a fragmental elevational view of the apparatus according to the present invention;

Fig. 2 is a partial top view of the apparatus shown in Fig. 1;

Fig. 3 is a fragmentary side elevational view of the apparatus of the present invention;

Fig. 4 is a partial elevational view of the printer with the front plate removed, to show the selector mechanism;

Figs. 5, 6, and 7 are views of the selector mechanism in accordance with the present invention; and

Fig. 8 is a view showing an alternative form of printing mechanism.

The combination sending-receiving apparatus shown in Figs. 1 and 2 comprises essentially a printing unit indicated generally as I I and a keyboard transmitting unit indicated generally as I2. In practice, of course, two or more of such apparatusesare interconnected in a telegraphic signal line for intercommunication. Although various forms of transmitting mechanisms may be employed, the one chosen to illustrate' the present embodiment is in accordance with the transmitter mechanism disclosedin U.. S. Patent No. 1,595,472. As shown in Figs. 1 and 2, the keyboard portion is provided With a set of keys I3 arranged similar to the well-known typewriter keyboard, and the key levers I4 associated with the keys I3 are pivotally mounted on 'a, common shaft (not shown) and are spring held in normal horizontal position in well-known manner. I

Key levers I4 extend over a number of pairs of code bars I5 and I 6 included in the selecting mechanism which is of the formdisclosed in U. S. Patent No. 1,884,753 granted to H. L. Krum. The bars I5 and I6 of each pair are supported (Fig. 1) at each end by T-shaped rocker arms I! mounted on pivot rods I8. T-levers H are provided with offset lugs I9 and 2|, which uphold the code bars I5 and I6, respectively, of the corresponding pair of code bars. The rocker arms I! of each pair of code bars are pivoted to and reciprocate a permutation bar 22. Each key lever I4 is arrangedto depress one of the code bars I5 or I6 of each pair of code bars and, through the medium of rocker arms I! and bars 22, to lift the other code bars. The permutation bars 22 are set in characteristic combinations and for this purposethe code bars I5 and I6 are provided with notched upper edges, the bars of each pair being complements; that is, the high portions of one bar are opposite the low portions of the other bar of the same general pair. It is also noted that the code and permutation bars have no normal position and are moved back and forth by the key levers l4. As is clearly apparent from Fig. 1, the bar I6 is lowered and the bar i is raised by certain key levers. since each key sets the code bar in its individual combinational position, two keys cannot be completely depressed at the same time, and any attempt to do so will bring the code bars to their mid-position, which is, of course, a non-selecting position.

The T-levers H at the right-hand side of the unit l2 (as viewed in Fig. 1) are provided with vertically extending arms 23 which terminate in bifurcations adapted to embrace the. lower extremity of the depending arm of individual looking latches 24. The series of locking latches. 24

corresponding to the series of pairs of code bars l5 and I6 is rocked to either .of two positions through the operation of said codebarsp Associated with latches 24 are a corresponding series of contact levers 25 for making and breaking transmitting contacts 26. Contact levers 25 coact with individual contact cams,21,mounted on shaft 28. The shaft 28 is provided with a clutch mechanism, not shown, which is adapted to be controlled by a. universal bar member substantially as set forth in Patent No. 1,595,472. r

The operation of the transmitting unit con: sists essentially in the depression of a key lever M which effects the arrangement of the set of code bars |5--|6 permutably in accordance with a predetermined code combination, the setting of which determines the position of the locking latches 24. The rotation of the cams 21 is initiated substantially simultaneously with the setting of the locking latches 24, and the locking loop 29 controlled by a cam 3| is permitted to rotate in a counterclockwise direction (Fig. 1) to effect the locking of latches 24 during the transmitting cycle. The setting of the locking latches 24 determines whether the contact levers 25 shall or shall not be affected by their associated cams 21 to cause the opening or closing of their associated contacts 26 to transmit over a signal line to the receiving station a predetermined code combination of signaling impulses. Th respective notches in the cams 21 are arranged in a helical progression so that upon the rotation of the cam assembly, the contacts 26 will be controlled successively. The apparatus herein disclosed is operated in accordance with an equal length letter code, in which each code combination is a permutation of marking and spacing conditions and is preceded by a start impulse and followed by a stop impulse, accord ing to the familiar start-stop system. 7

' The receiving portion II of the apparatus herein described comprises a receiving selector mechanism of a type similar to that disclosed in U. S. Patent No. 1,811,133 granted to E. E. Kleinschmidt, which is responsive to the signaling impulses transmitted to it through the transmitting contacts comparable to'contacts 26 of the sending station. Since the normal condition of the signal line is amarking condition, the armature 33 of the selector magnet 32 remains in its actuated or attracted position as shown in Fig. 2. The selector magnet 32 is carried on a bracket 34 mounted on the housing'of the transmitting portion l2. Also secured to bracket 34 is the member 35 to the extremity. of which is pivoted at 36 the armature '33. The armature33 is'pro- Also,

vided with a bifurcated actuating extension 31, Fig. 7, the bifurcated end of which fits into annular channel 38 of the selector cam shaft 4|. The shaft 4| is slidably journaled in a stationary bearing 42 which is supported upon the base housing l2. Formed integrally with the opposite end of shaft 4| is a bearing extension 43 which fits slidably into a suitable recess or bore formed in the end of the stud shaft 44. Stud shaft 44 is journaled for rotation in fixed bearing 45, and rigidly secured thereto and driven thereby is a trip cam 46 which is provided with a driving extension 41. Driving extension 41 is pivotally connected to cam shaft drive member 48 which, in turn, is articulated to cam shaft 4| by means of securing pin 49. The shaft section 44 is driven through a friction or slip clutch indicated generally as 5| (Fig. 3) which may be of any suitable construction and which is driven by a gear 52, rotatably carried on a stud shaft 53 mounted on bracket 54. Gear 52 meshes with and is driven by a pinion 55 which is mounted on the armature shaft 56 of a motor 51, which in operation rotates the shaft 56 at a predetermined and constant speed.

Secured to cam shaft 4| is a stop pin 58 which,

in th position of parts shown in Figs. 4 and 7,

engages a stationary stop projection 59 suitably supported from the framework of the mechanism, A series of selecting cams or pins 6|. is

' arranged and equally spaced helically around the shaft 4| and is rigidly secured thereto. Depending upon the selective condition of shaft 4| (with reference to axial position) the cams 6| will suecessively engage cam portions 62 of selector levers 63, or actuating extensions 64 of latches 65 (Figs. 5, 6, and 7). With each selector lever 63 is as sociated a latch 65, and lever 63 normally tends to rotate in a clockwise direction, while latch 65 normally tends to rotate in a counterclockwise direction under the action of a common spring 66 extended therebetween. The selector levers 63 are pivotally mounted on a shaft 61, while the latches 65 are pivotally carried on a shaft 68. Selector levers 63 have no normal position but remain in their last selected position until a change is effected by their respective cams 6|; for example, shaft 4| normally tends to rotate by the constant torque applied to it through the friction clutch 5|, but is constrained against rotation by the arrestment of stop arm 58 by the stop lug 59, which arrestment is maintained so long as selector magnet 32 remains energized by marking current on the signal line.

Upon receipt of a start impulse, which effects the deenergization momentarily of the selector magnet 32, the. armature 33 will be released and spring 69 will c auseshaf-t 4| to be shifted downwardly, as viewed in Fig. 7, toeffect disengagement of stop arm 58 from stop member 59 there by initiating the rotation of shaft 4|. Shaft 4| will be reciprocated axially in response to the succeeding signaling impulses and the corresponding energizations and deenergizations of the selector magnet 32; that is, if the first impulse after the start impulse is marking, the selector magnet will be energized as the first cam 6| approaches the corresponding selector lever 63 (Fig. 6), whereupon the first camprojection 6| will coact with the cam portion 62 of selector lever 63 to depress said cam lever against the action of spring 66 to permit counterclockwise movement of latch 65 and to cause the engagement of vertical projection 1| of lever 63 with the. shoulder 12 oflatch 65, as shown in Fig.5,

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also to bring projection 10 on lever 63-out of co operative relation with associated seeker levers 60 for the purpose that will hereinafter appear.

On the other hand, if the first impulse after th start impulse is of spacing nature, the armature 33 will remain released due to continued deenergization of selector magnet 32, whereupon spring 69 will retain the shaft 4I downwardly (as viewed in Fig. '7) or outwardly (as viewed in Figs. 5 and 6) to cause the first cam projection 6| to coact with the actuating extension 64 of the latch 65 (Fig. 5) associatedwith the first selector lever 63 causing said latch to rotate slightly in a clockwise direction against the action of its spring 66 to permit rising or clockwise rotation of lever 63 .and to bring vertical; lug H of lever 63 into engagement with shoulder 13 of latch 65, as shown in Fig. 6, thereby bringing lug into cooperative relation with associated seeker lever 59. The same selective operations will occur in response to the succeeding signaling impulses, and lever 63 or latch 65 will be directly actuated depending upon the nature of the signal impulse and the corresponding axial position of shaft 4i. Since the stop impulse of the code combination is of marking nature, the selector magnet 32 will become energized as the stop arm 58 approaches the stop member 59 thereby causing armature 33 to be attracted and the shaft 4| to be actuated upwardly as viewed in Fig. '1) bringing stop arm 58 directly in the path of stop lug 59, whereat it will remain until the subsequent reception of a start impulse.

Near the end of the cycle of rotation of shaft 4|, the trip cam 46 cooperates with arm 14 of a clutch release lever (Fig. 6) to initiate the rotation of the elements carried on the main operating shaft 16. Mounted on the main operating shaft 16 is the driving portion 11 of a grab clutch 18. Integral with driving portion 11 is a gear 19 which meshes with the pinion on the motor shaft 56. Thus, gear 19 and driving portion 11 rotate continuously with the motor pinion 55. The grab clutch 18 comprises also a driven portion BI which is slidably carried on shaft 16 and which is splined to a sleeve 82' (Fig. 2) to provide a driving connection with said sleeve. Clutch portion 8| is also provided with a flange 83 which has conformed thereon a cam surface 84 which coacts with a vertical arm 85 of the clutch release lever 15. .When clutch release lever 15 is acted upon by cam46, suificient counterclockwise movement (as viewed in Fig. 6) will be imparted to clutch release lever 15 to effect the disengagement of arm .85 from the. cam

portion 84 whereupon the portion M of: clutch 18 will be urged leftwardly (as viewed in Fig. 3) or upwardly (as viewed in Fig. 2) by a helical spring 86 carried on sleeve 82. In this manner, positive rotation is imparted to sleeve 86 during one cycle of rotation of clutch 18. Since arm 85 of clutch release lever 15 is normally biased toward the clutch portion BI by a spring 81, the extremity of arm 85 will coact with the cam 84 to cause the disengagement of the clutch portion 8| from the clutch portion 11, and as arm 85 strikes the stop portion 88, further rotation of clutch portion BI is prevented.

Integral with sleeve 82 is a sleeve 89 and fixed to sleeve 89 are a series of peripherally notched code discs 9|, as well as cams 90, 92, 93, and 94. Sleeve 89 is fixed to shaft 16, which shaft is journaled in suitable bearings provided in brackets .54 and 95, bracket 95 being secured to front plate 96. In front of plate 96 and fixed toshaft 16 are a. driving ratchet 91 and a type wheel 98.

The code discs 9| are so notched that each permutational setting of the series of seeker levers 60 will, upon sensing the periphery of the code discs, find first a permuted arrangement of wards and notches in the peripheries of the code discs individual to that setting of the seeker levers, and they will control the actuation of the printing mechanism. The character on the type wheel allotted to said setting of the seeker levers corresponds to the code thus first found in the discs. The seeker levers 60 are carried in a cradle 99, and the cradle 99 and seeker levers 60 are both pivotally carried on a common pivot shaft MI. The upper end of each seeker lever 60 is conformed with a nose portion I02 adapted to ride, during the seeking cycle, on theperiphcry of its respective code disc 9|. At the upper end of each seekerlever 60- there is also provided a stepped portion I03 which coacts with an individual latch I04 carried on common pivot rod I05 mounted in vertical arms I06 of the cradle 99. Extended between latches I04, and seeker arms 60 are individual springs I01. Cradle 99 is also provided with a cam follower arm I08 which cooperates with the aforementioned cam 90.

Depending from the cradle 99 is an arm I09 which terminates in a laterally extending portion III (Fig. 3) which controls the printing function, as will presently appear. Pivotally carried at .II2 (Fig. 4) above the latches I04 is a reset bail II 3 which has an arm II4 which coacts with cam 92. The portion III of the depending arm I09 extends through the front plate 96 and cooperates with an arm II5 (Fig. 1) depending from a printing pawl arm H6 which, in turn, is pivotally carried at II1 on the printing hammer lever II8 pivoted at II9 to the front plate 96 and'biased counterclockwise by a spring I20. Arm II5 of the printing mechanism is provided with shoulders I2I and I22 which cooperate with fixed detent I23 and latch I24, respectively. Arms H5 and II6 of the printing mechanism are normally biased upwardly by a spring I25, and arm H5 is normally urged into a counterclockwise direction by a spring I26 extended between arms II5 and II6. Detent I23 is adjustable'in accordance with the tripping movement of portion III' of arm I09 of cradle 99. Latch lever I24 is normally biased in a counterclockwise direction by a spring I21 against a stop I28. An adjustable stop I29 is provided for the printing hammer lever H8, and an adjustable stop I3I is also provided to coact with depending arm I32 of printing pawl arm II6.

As shown in Figs. 3 and 4, the laterally disposed portion I'II of depending lever I09 cooperates with a latch arm I33 pivoted at I34 to a bracket I35. Latch arm I33 is normally biased in a clockwise direction by a spring I 36 and is provided with a shoulder I31'which coacts with portion II I to limit the clockwise motion of cradle 99 imparted by a spring I38 (Fig. 2). For

a purpose which will hereinafter appear, cradle 99 is rocked counterclockwise against the action of its spring I38 by the action of cam (Fig. 4) upon arm I08. By this movement of cradle 99, portion III is actuated rightwardly, as viewed in Fig. 4, to coact with inclined cam surface I39 on latch arm I33 whereby latch arm I33 is camm'ed downwardly against the action of its spring, I36 to bring shoulder I31 out of operative relation with portion I I I, and causing shoulder. I31 to become engaged with the shouldered portion 4| of the vertical arm of a latch lever I42 which is normally biased in a clockwise direction by a spring I43.

counterclockwise rocking of cradle 99 will rotate also those seeker levers 60 which are cleared by lugs 18 on selector levers 63 positioned as shown in Fig. 5, but where a lever 63 is positioned as shown in Fig. 6 with lug I blocking a seeker 60, the seeker does not rotate and latch I04 is carried away from seeker 60 and the shoulders engage as shown in Fig.4, thus transferring to seeker levers 60 that combinational code registered on levers 63. l

When cam 99 passes arm I08, spring I38 will urge the cradle 99 clockwise to bringthe nose portions I02 of the seeker levers 60 into contact with the peripheries of the code discs 9|, and. to bring portion III free of the shoulder I31 which is now latched down by the latching lever I42. N

Thereafter, when the seeker levers 60 have found an arrangement of wards and notches in the code discs 9| conforming to the particular setting of the seeker levers 60, said seeker levers will fall into the notches thereby causing cradle 99'to rock further in a clockwise direction in response to the action of its spring I38. This further clockwise movement of cradle 99 will carry portion III further in a leftward direction thus striking the vertical arm I4I of latch lever I42 to effect the disengagement thereof from shoulder I31. Simultaneously, portion II I in its left ward movement disengages arm II5 from detent I23 (Fig. l) permitting spring I to carry printing pawl arm II6 upwardly to bring the tooth I46 thereon into engagement with driving ratchet 91, which, due to its clockwise rotation during the printing cycle, will carry the pawl arm II6 sharply to the left, and due to the cooperative relation between pawl arm I I6 and printing hammerlever II8, lever ||8 will be actuated clockwise about its pivot II9 to bring its platen portion I44 against the proper character on the type wheel 98 to effect printing upon a tape I45;

During this printing operation, pawl arm H6 is carried leftwardly to bring depending arm I32 against stop I3I, and further leftward movement of pawl arm I I6 will cause said arm to be rotated counterclockwise about its pivot III to effect the disengagement of tooth I46 from the ratchet 91, and, due to the momentum imparted to pawl arm II6 by driving ratchet 91, pawl arm II6 will be rotated counterclockwise sufiiciently to bring shoulders I2I or I22 into engagement with detent I23 or latch I24 respectively. Latch. I24 is provided to prevent the pawl arm I|6 from engaging the drive ratchet 9'! more than once during a printing or operating cycle. To effect this result, arm II5, when it is driven downwardly against the action of spring I25, will be prevented from returning upwardly by spring I25 by the coaction of shoulder I22 and latch I24 if the portion I I I happens still to be in its leftward position to prevent the engagement of shoulder I2| with detent I23. Then, when portion I I I is restored to its position whereat it is again latched by latch arm I33, which occurs when seeker levers 60 are cammed out of the notches in discs 9| into which they have just previously fallen, spring I26 will urge arm 5 counterclockwise to disengage shoulder I22 from latch I24 and, since the lower edge of latch I24 is located slightly below the latching edge of detent I23, arm II5 will ride off of the latch I24 and onto the shoulder of detent I23. It is manifest that by this arrangement,

portion I II is effective only once during each rotation of shaft'16to trip arm II5 to effect printing, the portion III being immediately restored, due to the momentum caused by the cammingout action of seeker levers 60 by the notches in discs 9 I. r

The tape I45 is supplied from a source not shown and is directed around a guide roller I4! (Fig. l) thence over a feed roller I48 through a tape guide I49. Positioned above and cooperating with feed roller I48 is a pressure roller I5| carried on a lever I50 which is pivoted at I52 to front plate 96 and is normally biased into pressing engagement with the roller I48 by a spring I53. Spacing or stepping movement is imparted to roller I48 by the spacing mechanism shown in Fig. 4, which comprises a spacing lever I54 plvoted at I55 to the back of the plate 96. Spacing lever I54 is provided with an arm I56 which cooperates with the spacing cam 93 carried on shaft 16. With the spacing mechanism shown, the spacing movement occurs after printing so that durin the major portion of the operating cycle, cam 93 causes spacing lever I54 to be rocked in a clockwise direction against the action of spring I5I to actuate pawl I58 downwardly to bring the pawl tooth into engagement with the next tooth on the ratchet wheel I59. Then approximately at the end of the printing cycle, the follower lever I56 is caused to fall off the high portion of cam 93, thus permitting spacing lever I54 to respond to the pull of spring I51 and to cause pawl I58 to rotate ratchet wheel I59 one angular step, which, through stud shaft I6I, imparts corresponding angular motion to feed roller I 48.

General operation The relative positions of the parts during the period of rest are as shown in Figs. 1 to 7 inclusive, and the motor 51 is assumed to be continuously running, thus applying a constant torque to friction clutch 5| and causing constant rotation to the driving member 11 of the grab clutch I8. Upon reception of the starting impulse, the selector magnet 32 will be deenergized, thus permitting armature lever 33-31 to respond to the action of spring 69 associated with the selector cam shaft 4|; that is, cam shaft 4| will be moved downwardly, as viewed in Fig. 7, to cause the disengagement of stop arm 58 from stop member 59, and initiation of rotation of cam shaft 4| is thus effected. Then in response to succeeding signal impulses of marking or spacing nature, cam shaft 4| will be reciprocated in a corresponding manner. Thus, as clearly set forth in aforementioned Patent No. 1,811,133, the selector levers 63 or latches 64 will be actuated by the cams 6| to cause a permuted setting of levers 63 in accordance with the received code signal.

Near the termination of the code cycle, cam 46 will actuate the clutch release lever '15 to disengage arm from the driven portion 8| of grab clutch I8, whereupon through the engagement of portions '11 and 8|, grab clutch 18 will cause the rotation of the elements mounted or carried on shaft '16; namely, code discs 9|, cams 90, 92, and 93, driving ratchet 9'1, and type wheel 98. When shaft I6 is thus initiated into rotation, cam 92 coacts with reset bail M3 to rock the latches I04 clockwise to bring seeker levers 60 into the position shown in Figs. 5 and 6 whereat the seeker levers 60 are in their unselected positions, and latches I04 engage the lower shoulder of the series of shoulders I03. Immediately thereafter cam actuates cradle 99 in a counterclockwise direction against the action of its spring I38 to bring, first, the seeker levers 69, which through springs I91 will tend to follow cradle 99, into coaction with lugs 19 on selector levers 63 in such manner that those selector levers 63 which are in their elevated position, as shown in Fig. 6, will, through lugs 19 thereon, prevent the seeker levers individual thereto from rotating in correspondence with cradle 99. Those seeker levers 69 which are estopped by lugs 19 will resist the pull of spring I91, and accordingly, latches I94, which are constrained to follow'cradle 99, will engage the upper shoulder of the series of shoulders I93. On the other hand, those seeker levers which are not estopped by lugs 10, as shown in Fig. 5, will continue to rotate with cradle 99, and latches I94 will continue to engage the lower of the series of shoulders I93. I

Concurrently, as previously described, portion III of depending arm I99 of cradle 99 will cam the latch lever I33 downwardly by its action on cam surface I39 to permit'latch lever I42 to engage shoulder I31 and lock the lever I33 in its downward position. Thus, after cam 99 passes arm I98, cradle 99 will respond to the pull of its spring I38 to bring the latched seeker levers 69 into contactual engagement with code discs 9I, and as the code discs 9I continue to rotate, a permuted arrangement of wards and notches will eventually be found which corresponds to the permuted setting of the latched seeker levers 69, at which instant, when such setting is found, the selected seeker levers will fall into the notches corresponding thereto thus permitting spring I38 to actuate the cradle 99 slightly farther in a clockwise direction, whereupon portion II I will be actuated leftwardly sufficient to disengage shoulder I2I of arm II5 from detent I23. Spring I25 will thereupon be free to act to bring tooth I46 of pawl arm I I6 into engagement with the driving ratchet 91.

The rotation of driving ratchet 91 will carry pawl arm II6 sharply toward the left (as viewed in Fig. 1) which action will cause, through pivot II1, printing hammer lever H8 to be rotated sharply in a clockwise direction against the tension of spring I29 to impinge platen I44 against the proper character on the type wheel corresponding to the code signal received. In this manner, the characters on the type wheel are caused to be printed while the type wheel is in motion or on the fly. As previously mentioned, the leftward movement of pawl arm II6 will cause, through the striking of arm I32 against stop I3I, the pawl arm II6 to be rotated counterclockwise, disengaging pawl tooth from ratchet 91, permitting ratchet 91 to continue its rotation until shaft 16 is stopped by the engagement of arm 85 of the clutch release lever 15 and portion 89 of the flange 83, and also to restore arm II5 into latching engagement initially with either detent I23 or latch I24, and subsequently to bring shoulder I2I into engagement with detent I23 in the previously mentioned manner.

It is understood that during normal operation of the apparatus, the constituent parts move rap idly, and accordingly, the seeker levers 69, which have fallen into corresponding notches in, the code discs 9|, are immediately thereafter cammed out by the inclined surface of the cam notches and in so doing the momentum imparted to the seeker levers 69 by this cammingout action is transmitted to the cradle 99, which is thrust sharply in a counterclockwise direction sumbination of signals is received; that is, with the arrangement according to the present invention, the printing of more than one character per cycle is prevented.

Modification A further feature of the present invention reside's in the provision of a toggle printing mechanism, as shown in Fig. 8. 'In this form of printing mechanism, portion III of depending arm I99 of the cradle .99 acts to initiate the operation of a toggleprinting mechanism, instead of the printing mechanism for effecting the fly printing as disclosed in the principal embodiment'of the invention. In this form of the invention, the cradle 99, when acted upon by cam 99, will set the latch I33 inthe-manner described in connection with the principal form of the invention. Withthe latch I33 so conditioned as to have shoulder131 thereof engaged by the latch lever I42 and the seeker levers 69 in contactual engagement with the peripheries of the code discs while performing the seeking function, the cradle 99 (when the seeker levers 69 are set in accord ance with a received code combination have found a corresponding arrangement of wards and notches in the code discs) will be actuated sharply in a clockwise direction by the action of spring I38 so that portion III will, in the presently described form of printing mechanism, act

, upon a latch lever I62 to rotate it against the action of its spring I63 out of engagement with arm I64 of a togglelever I65 pivoted at I66 to the front plate 96.

Upon becoming thus disengaged, lever I65 will be swung sharply in a clockwise direction by a spring I61 extended between vertical arm I68 of toggle lever I65 and a spring post (not shown) attached to front plate 96. Pivoted at the extremity of arm I68 is a toggle link I69, to the extremity of which-is pivoted the free end of a printing lever I1I-pivoted at I12. Thus during the toggling actionof lever I65 and link I 69, I

printing lever I1I isrotated slightly in a counterclockwise direction sufliciently to bring a platen I13 integral therewith against the selected character on the type wheel 98. Lever I1I also carries a stabber I14 which cooperates with a star wheel I 15 so that at the instant of printing, the type wheel 98 is maintained momentarily .with the selected character in printing position.

Tocompensate for this, the type wheel and star wheel are yieldably connected to the shaft 16, in a manner similar to that disclosed in United States Patent No, 2,181,708, issued Nov. 28, 1939, to A. H. Reiber, so that the shaft 16 may continue in its rotation, and upon completion of the printing operation, the type wheel and star wheel will be returned to their proper angular position with relation to the shaft 16.

To restore the toggle mechanism to its operative position after printing, the cam 94 on shaft 16 is provided with a reset lever I16 pivotally mounted on the plate 96. Reset lever I16 is provided with a cam follower arm I11 and a reset arm I18, the latter arm coacting with an arm I19 i will rotate clockwise, and'at a predetermined instant in the cycle when latch I62 is stripped out of engagement with arm I64 as previously de scribed permitting toggle lever I65 to swing toward the right under the action of its spring I61, the arm I19 integral with toggle lever I65 will coact with the depending arm I18 of the reset lever I'IB to swing said reset lever H6 in a counterclockwise direction against the action of its spring I8I. Near the end of the operative cycle, cam 94 will coact with arm III of the reset lever II6 imparting to the reset lever II6 clockwise rotation which, through arm I18, will impart counterclockwise rotation to toggle lever I65 against the action of its spring I61 to bring arm I64 again into latching engagement with latch I62 preparatory to the initiation of a succeeding. printing operation.

Although the present invention has been disclosed in connection with certain specific embodiments thereof, it is understood that such embodiments are merely illustrative and not restrictive and that all forms coming within the scope of equivalency of the appended claims are intended to be covered by the invention.

What is claimed is:

1. In a printing telegraph receiver, a shaft, a type wheel carried by said shaft, a series of code discs aflixed to said shaft, a single magnet selecting means, a plurality of seeker members selectively positionable under the control of said means for cooperation with said code discs, means for positioning said seeker members whereby the selective position of the type wheel is determined, and a printing mechanism initiated into operationu nder the direct control of said positioning means in response to the cooperation between said seeker members and said code discs to cooperate with said type wheel for recording.

2. In a telegraph printer, a type wheel, a printing hammer coacting with said type wheel, a plurality of discs fixedly related to each other, said discs being notched in permuted manner determinative of the positions of the characters on the type wheel, means responsive to received code combinations of signaling impulses, a plurality of seeker levers, and means for positioning said levers permutably in accordance with the operation of said means whereby the selective position of the type wheel is determined, said means effective directly upon the presentation of a code in said discs corresponding to the setting of said levers for releasing said printing hammer for coaction with said type wheel.

3. In a telegraph printer, a type wheel, a printing hammer coacting with said type wheel, means for operating said hammer, a plurality of discs fixedly related to each other, said discs being notched in permuted manner determinative of the positions of the characters on the type wheel,

a plurality of seeker levers, a selector means for controlling the permutabie setting of said levers in accordance with receivedcode combinations of signaling impulses, and means for positioning said levers permutably in accordance with the operation of said means whereby the selective position of said type wheel is determined, said means effective directly on said hammer operating means upon the presentation of a code in said discs corresponding to the'setting' of said levers for releasing said hammer operating means for coaction with said type wheel.

4. In a printingtelegraph -receiver, a shaft carrying a type wheel, a series of discs fixedly related to each other and carried by said shaft,

said discs being notched in permuted manner determinative of the positions of the characters on the-type wheel, a single magnet selecting means, a plurality of seeker members selectively positionable under the control of said means for cooperation with the coded peripheries of said code discs, means for positioning said seeker members whereby the selective position of the type wheel is determined, and a printing mechanism including a toggle device, said device controlled by said seeker members to effect the operation of said printing mechanism.

5. In a printing telegraph receiver, a shaft carrying a type wheel, a series of code discs affixed to said shaft, selecting means, a plurality of seeker members selectively positionable under the control of said means, means for positioning said seeker members whereby the selective position of the type Wheel is determined, a printing mechanism, and a latch means for said printing mechanism, said latch means controlled directly by said positioning means in response to the cooperation between said seeker members and said code discs for initiating the operation of said printing mechanism.

6. In a printing telegraph receiver, a shaft carrying a type wheel and a ratchet, a series of code discs affixed to said shaft, selecting means, a plurality of seeker members selectively positionable under the control of said means, means for positioning said seeker members whereby the selective position of the type wheel is determined, a printing mechanism including a spring-actuated pawl member, and means controlled by said seeker members incooperation with said code discs for releasing said pawl member for coaction with said ratchet to effectuate the operation of said printing mechanism.

'7. In a printing telegraph receiver, a shaft carrying a type wheel, a series of code discs affixed to said shaft, a single magnet selecting means comprising a plurality of cam members, a selector member and latch member individual to each of said cam members, means whereby said cam members operate said selector members or said latch members in response to received signals, a plurality of seeker members, means for transferring the selection from said selector members to said seeker members, and printing mechanism effective in response to the cooperative action between said code discs and said seeker members to coact with said type wheel to efiect printing.

8. In a printing telegraph receiver, a type wheel, a single magnet selector mechanism comprising a plurality of cam members, a selector member and latch member individual to each of said cam members, means whereby said cam members operate said selector members or said latch members in response to received impulses, a plurality of seeker memberS means for transferring the selection from said selector members to said seeker members, .a series of discs fixedly related to each other,.and notched in permuted manner determinative of the positions of the characters on said type wheel, and a printing mechanism controlled by the cooperative efiect between said seeker members and the permuted arrangement of notches in said discs for printing from said type wheel.

9. In a printing telegraph receiver, a shaft carrying a type wheel, a series of code discs aflixed to said shaft, a selecting means, a plurality of seeker members selectively positionable under the control of said means for cooperation with said code discs, means for positioning said seeker members whereby the selective position of the type Wheel is determined, a toggle printing means, and means effective under the control of said seeker members for operating said toggle printing means to efiect the printing operation.

10. In a printing telegraph receiver, a shaft carrying a type wheel, a series of code discs affixed to said shaft, a single magnet selecting means, a plurality of seeker members, means for transferring the selective condition from said selecting means to said seeker members whereby the selective position of said type wheel is determined, a printing mechanism, and means effective in response to the cooperative action between said code discs and said seeker members for determining the instant of operation of said printing mechanism.

11. In a printing telegraph receiver, a type wheel, a single magnet selector mechanism comprising a plurality of cam members, a-selector member and latch member individual to each of said cam members, means whereby said cam members operate said selector members or latch members in response to received impulses, a plurality of seeker members, means for transferring the selection from said selector members to said seeker members, a series of discs fixedly related to each other, and notched in permuted manner to correspond to the permutable settings of said seeker members under the control of said selecting means determinativeof the positions of the characters on said type wheel, a toggle printing means, and means effective under the control of said'seeker members upon the cooperation of said seeker members with the coded peripheries of said code bars for operating said printing means to effect the printing operation.

12. In a printing telegraph receiver, a shaft carrying a type wheel, a series of code discs affixed to said shaft, a single magnet selecting means, a plurality of seeker members, means for transferring the selective condition from said selecting means to said seekermembers whereby the selective position of said type wheel is deter- 'mined, a toggle printing means, and mechanism effective in response to the cooperative effect between said code discs and 'said'seeker members for operating said printing means to eifect the printing operation.

13. In a printing telegraph receiver, a shaft carrying a type wheel and a ratchet, a series of code discs affixed to said shaft, a single magnet selecting means, a plurality of seeker members, means for transferring the selective condition from said selecting means tosaid seeker members whereby the selective position of said type wheel is determined, a printing mechanism in cluding a spring actuated pawl member, means effective in response to the coaction between said code discs and said seeker members for releasing said pawl member for cooperation with said ratchet, and means responsive to the coaction between said pawl and said ratchet to effect the printing operation.

14. In a printing telegraph receiver, a shaft carrying a type wheel and a ratchet, a series of code discs affixed to said shaft, a single magnet selecting means comprising a plurality of cam members, a selector member and latch member individual to each of said cam members, means whereby said cam members operate said'selector members or latch members in response to received signals, a plurality of seeker members, means for transferring the selective condition from said selector members to said seeker members whereby the selective position of said type wheel is determined, a printing mechanism including a spring-actuated pawl member, and means effective in response to the coaction between said code discs and said seeker members for releasing said pawl member for cooperation with said ratchet to eiTectuate the operation of said printing mechanism.

15. In a printing telegraph receiver, a shaft carrying a type wheel and a ratchet, a series of code disc-s afiixed to said shaft, a single magnet selecting means, a plurality of seeker members, means for transferring the selective condition from said selecting means to said seeker members whereby the selective position of said type wheel is determined, a printing mechanism including a spring actuated pawl member, means effective in response to the coaction between said code discs and said seeker members for releasing said pawl member for cooperation with said ratchet to effectuate the operation of the printing mechanism, and means for limiting the period of cooperation between said pawl and said ratchet.

16. In a printing telegraph receiver, a shaft carrying a type wheel and a ratchet, a series of code discs affixed to said shaft, a single magnet selecting means comprising a plura'ilty of cam members, a selector member and latch member individual to each of said cam members, means whereby said cam members operate said selector members or latch members in response to received signals, a plurality of seeker members, means for transferring the selective condition from said selector members to said seeker members whereby the selectiveposition of said type wheel is determined, a printing mechanism including a spring-actuated pawl member, means effective in response to the coaction between said code discs and said seeker members for releasing said pawl member for cooperation with said ratchet to effectuate the [operation of said printing mechanism, and means for limiting the period of cooperation between said pawl and said ratchet.

1'7. In a printing telegraph receiver, a shaft carrying a type wheel and a ratchet, a series of code discs affixed to said shaft, a single magnet selecting means, a plurality of seeker members selectively positionable under the control of said means, means for positiening said seeker members whereby the selective position of the type wheel is determined, a printing mechanism including a spring-actuated pawl member, means controlled by said positioning means in response to the cooperation of said code discs and said seeker members for releasing said pawl member for coaction said ratchet to effectuate the operation of said printing mechanism, and means for limiting the period of coaction. between said pawl and said ratchet.

18. In a printing telegraph receiver, a shaft carrying a type wheel, a series of codediscs ailixed to said shaft, a single magnet selecting means, a plurality of seeker members, av cradle for carrying said seeker members, a springactuated latch individual to each seeker member carried by said cradle for latching the seeker members in selective position, means for rocking said cradle to effect the trai for of the selective condition from. said select means to said seekermembers whereby the selective position of said type wheel is determined, and means controlled by said cradle in response to the cooper.-

ati've effect between said code discs and said seeker members to effect printing from said type wheeL' l 19. 111 a telegraph printer, a type wheel, a printing hammer coacting with said type wheel, control mechanism for said printing hammer, a plurality of discs fixedly related to each other, said discs being notched in permuted manner determinative of the positions of the characters on the type wheel, a plurality of seeker levers, a single magnet selector means for controlling the operation of said levers permutably in accordance with received code combinations of signaling impulses, and means eifective upon the presentation of a code in said discs corresponding to the setting of said levers for releasing said printing hammer control mechanism for operation.

20. In a printing telegraph receiver, a shaft carrying a type wheel and a ratchet, a series of code discs affixed to said shaft, a single magnet selecting means, a plurality of seeker members selectively positionable under the control of said means, means for positioning said seeker members whereby the selective position of the type wheel is determined, a printing mechanism including a spring-actuated pawl member, and means controlled by said seeker members for releasing said pawl member for coaction with said ratchet .to effectuate the operation of said printing mechanism.

21. In a telegraph printer, a shaft carrying a type wheel and a ratchet wheel, a printing hammer coacting with said type wheel, a series of code discs afiixed to said shaft, a single magnet selecting means, a plurality of seeker members selectively positionable under the control of said means, a printing mechanism including a spring actuated pawl member, means controlled by the cooperation of said code discs and said seeker members for releasing said pawl member for coaction with said ratchet wheel to effectuate the operation of said printing hammer, means for limiting the period of coaction between said pawl member and said ratchet wheel, and means for varying the printing blow of said printing hammer.

22. In. a telegraph printer, a type wheed, a printing hammer coacting with said type wheel, means for operating said printing hammer, a plurality of code discs fixedly related to each other, said code discs being notched in permuted manner determinative of the positions of the characters on the type wheel, a plurality of seeker levers, a selector means for controlling the permutable setting of said levers in accordance with received code combinations of signaling impulses, means for setting said seeker levers as determined by said selector means, means effective directly on said first recited means upon the presentation of a code in said discs correspending to the setting of said levers for releasing said printing hammer operating means for recording, and means for varying the printing blow of said printing hammer.

23. In a printing telegraph receiver, a shaft carrying a type wheel, a series of code discs affixed to said shaft, selecting means, a plurality of seeker members, means cooperable with said selecting means to condition said seeker members for selective operation with said code discs, a printing mechanism, latch means for said printing mechanism, and means controlled directly by said conditioning means for tripping said latch means to initiate operation of said printing mechanism 'for. printing from said type-wheel.

24. In a printing telegraph receiver, a single magnet selector mechanism comprising a plurality of cam members, a selector member and latch member individual to each of said cam members, means whereby said cam members operate said selector members or said latch members in response to received impulses, a plurality of seeker members, means for transferring the selection from said selector members to said seeker members, a' shaft carrying a type wheel and a series'of disc s affixedly related. to each other, said discs being notched in permuted manner determinative of the positions of the char-' acters on said type wheel, and a printing mechanism controlled by the cooperative engagement between said seeker members and said code discs for printing from said type wheel.

25. In a printing telegraph receiverfa shaft, a type wheel carried by 'said shaft, a series of code disc's aflixed to said shaft, a single magnet selecting means, a plurality of seeker members, means to render said seeker members permutably positionable under the control of said selecting means for cooperation with said code discs, and a toggle printing mechanism controlled by said seeker members for printing from said type wheel.

26. In a'telegraph printer, a type wheel, a toggle printing means coacting with said type wheel, a plurality of. discs fixedly related to each other, said discs being notched in permuted manner determinative of the positions of the characters on the type wheel, a plurality of seeker levers, means for operating said levers permutably in accordance with received code combinations of signaling impulses, and means effective upon the presentation of a coded arrangement of notches in said discs corresponding to the selective position ment of said levers for releasing said toggle printing means for operation.

27. In a printing telegraph receiver, a type wheel, aratchet cooperably related to said type wheel, a series of code discs one for each element of thecode operatively associated with said type wheel, means for rotating said type wheel, selecting'means, a' plurality of members, means under control of-said selecting means for causing said members to cooperate with said discs, and a printing mechanism including a spring-actuated pawl member controlled by the cooperation of said members with said discs, said third recited means acting in response to said cooperation to release said pawl member for actuation by said ratchet to efiect the printing operation.

28. In a' printing telegraph receiver, a shaft, a type wheel carried by said shaft, a series of code discs aflixed to said shaft, a single magnet selecting means, a plurality of seeker members, means to render said seeker members selectively positionable under the control of said selecting means for cooperation with said code discs, and'a ratchet and pawl operated printing mechanism controlled by said. seeker-members for printing from said type wheel. 7 Y

29; In a printing telegraph receiver, a type wheel, a printing hammer ccacting with said type wheel, ratchet and pawl means for operating said hammer, a plurality of discs fixedly related to each other, said'discs being notched in permuted manner determinative of the positions of' the cha'racter's'on the type wheel, a plurality of seeker levers,'means for operating said levers permutably in accordance with received code combinations of signaling impulses, and means effective discs, said discs coded in permuted manner such that each permutational setting of said seeker members will find first a code in said discs individual to the type character corresponding to said setting, a printing mechanism, and means effective directly in response to the coaction between said seeker members and said discs during the process of sensing for initiating the operation of said printing mechanism.

HOWARD L. KRUM.

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