US2040856A - Tape advancing device - Google Patents

Description

y 9 H. L. KRUM ET AL 2,040,856

TAPE ADVANCING DEVICE Filed Nov. 2, 1934 3 sheefc's sh eet l HOWAPD 1.. KeuM WAL 757? J. ZENNEP May 19, 1936.

H. KRUM ET AL TAPE ADVANCING DEVICE Filed Nov. 2, 1934 I5 Sheets-Sheet 2 INVENTOR HOWARD L. APUM BY WALTE/R ./.ZENNER I ATTOREEY Patented May 19, 1936 UNITED STATES PATENT OFFICE TAPE ADVANCING DEVICE of Delaware Application November 2, 1934, Serial No. 751,126

Claims.

This invention pertains to combination printing telegraph and projection systems, and more particularly to devices for imparting continuous movement to the recording medium through the telegraph and projection machines.

It has been found desirable in brokerage offices to project upon a screen the information printed on a ticker tape, so as to accommodate simultaneously a greater number of observers. This result is achieved by printing the information to be displayed upon a transparent or translucent tape and subsequently passing the tape through a projection machine. Normally the tape is advanced through the printer by a step-by-step spacing mechanism, thus imparting to the tape a movement which produces a running account of the ticker information proceeding along the projection screen spasmodically. Such a system is not conducive to easy reading. v

The principal object of this invention is to provide a solely mechanical means for imparting to the recording medium a continuous movement at a speed consistent with the eifective operation of the cooperating recording device.

According to a feature of the invention, the printing telegraph receiver includes a mechanism responsive to signalling conditions for selectively determining a character to be printed on a strip, and a pair of elements effective for each character selection to control the continued actuation of a motor driven tape advancing device.

The foregoing and other objects are achieved by eliminating the customary step-by-step spacing mechanism of the recording device and utilizing a device whereby a continuous motion is imparted to the recording medium during a continuance of recording operations and is arrested automatically 1' on the cessation of recording operations.

In accordance with the preferred embodiment of the present invention, the projecting unit is inserted in the space or location normally 0ccupied by the spacing mechanism of the recording apparatus, which may be of the type disclosed in U. S. Patent No. 1,989,710, issued to A. H. Reiber et al., and as thus arranged, the projection unit is mterpositiohed between the recording anparatus and the tape advancing device, such that the tape is drawn through the printing zone of the recording apparatus, then immediately through the projector to the tape engaging members of the tape advancing device.

Specifically, the tape advancing device according to the present invention includes a ratchet drive mechanism impelled alternatively by each of a pair of pawls actuated by a single cam having such conformation as to impart to the ratchet driven mechanism a uniform continuous movement through an overlap of the operative strokes of the reciprocating pawls; that is, a complete reciprocation of each pawl comprises an operative stroke and a return stroke, and the final portion of the operative stroke of one pawl overlaps the initial portion of the operative stroke of the other pawl, thus insuring a continuous rotation of the ratchet wheel on the tape engaging roller shaft and precluding the possibility of any hesitative or jerky movement to the tape. With this type of drive mechanism, although the pawls operate upon the ratchet wheel alternatively, still there are short periods when the alternations are being effected when both pawls are acting upon the ratchet simultaneously to produce the aforementioned overlap. Moreover, the action and inaction of the pair of pawls with the common ratchet wheel is controlled through a flexible push wire or cable means by a pair of cams in the recording or printhad from the following description, taken in con- 4 junction with the accompanying drawings, in which Fig. 1 is a perspective view of the tape advancing device of the present invention;

Fig. 2 is an elevational view of the driving mechanism for the tape advancing elements;

Fig. 3 is a sectional view taken on line 3-3 of Fig. 2;

Figs. 4 to 7 inclusive show various operative positions of the driving mechanism shown in Fig. 2;

Fig. 8 is a fragmental perspective view of the control mechanism for the tape advancing device associated with the main operating shaft of the printing apparatus disclosed in the aforementioned patent; i

Fig. 9 illustrates the operative relationship between the tape advancing device and the printing apparatus;

Fig. 10 is a sectional view taken on line ll-l I of Fig. 9, and

Fig. 11 is a schematic diagram illustrating the application of the present invention to a projection system.

Generally, the projection machine is preterably juxtapositloned to the recording device to reduce to an absolute minimum .the time transpiring between the recording and the appearance or that record on the screen. The maintenance 01' a minimum distance between the recording hood that the information on the portion of the tape between the recorder and projector will be displayed until after further recordations are made, which, in the eventof an inactive market, might not occur for an appreciable time.

As illustrated in Fig. 11, the tape supply is derived from a tape spool II located either interiorly or exteriorly of a printing unit l2 which may be of a type similar to that disclosed in the aforementioned patent. The tape i0 is passed over a platen I3 of the printing unit, then to an adjacently disposed projector M, from which it passes over a tape guide l5, around a guide roller 16, through tape engaging means 41, to a reel it! of a tape take-up device which is, in the present embodiment, located in the tape advancing device.

Referring to Fig. 1, which illustrates the tape advancing device, it is observed that this device comprises a continuously running motor 2|, which imparts, through a pinion 22 mounted on the shaft thereof, continuous motion to a. worm gear 23 carried on a main drive shaft 24 which is journaled in bearings mounted in brackets 25 and 26 supported on the base 21 of the tape advancing device.

Also mounted on shaft 24 are a cam 28 and a grooved pulley 29. The pulley 29 is operatively connected by a belt 3| with a pulley 32 carried on the tape reel shaft (not shown) journaled in a bracket 33 mounted on the base 21, which shaft also carries the tape reel I8 of a tape take-up device indicated generally as 34. The belt 3| functions so that when the tape I0 is held taut between the tape engaging means l1 and the reel 34, it slips on the pulley 32, thus precluding the likelihood of severing the tape. For this purpose the belt 3| has been found to give best results when constructed of a continuous helical spring, since its yieldability provides the utmost of protection to the tape against severance and compensates for the increasing diameter of the tape wound on the reel 34.

Having reference to Figs. 1 and 2,. the cam 28 operates upon a pair of cam follower rollers 35 and 36 carried by levers 31 and 38 pivoted at 39 and 4|, respectively, to bracket 26. Lever 31 is normally biased by a spring 42 extending between the extremity of lever 31 and bracket 26, thus constantly maintaining follower roller 35 in operative relationship with the periphery of cam 28. Similarly, lever 38 is normally biased by a spring 43 extending between the extremity thereof and bracket 26, thereby holding follower roller 36 constantly in contactual relationship with cam 28.

Pivotally connected to and depending from the extremities of levers 31 and 38 are a pair of pawl members 44 and 45 respectively, which are yieldably connected near their lower extremity by a common spring 46 which tends to maintain these pawls in operative relationship with a ratchet wheel 41 interposed therebetween. Pawl teeth 48 and 49 of pawl members 44 and 45 respectively,

are operatively disposed with respect to ratchet parting rotative motion to 'ratchet wheel 41.

Pawl member 45 is still proceeding in an upward direction, and through its coengagement with ratchet wheel 41 is effecting its rotation. Now, pawl member 45 has still, to continue to coact with ratchet wheel 41 through the angular distance indicated by numeral 52 to its extreme vertical or upward position, but as pawl member 45 traverses this distance, pawl member 44 will traverse simultaneously the angular distance indicated by numeral 53, thus showing that for a predetermined period, both pawl members 44 and 45 are acting to impart, simultaneously, rotative motion to ratchet wheel 41, thus providing an overlap of operative coaction. As the pawls 44 and 45 are actuated'from the position shown in Fig. 4 to that shown in Fig. 5, the cam 28 has rotated an angular distance represented by the relative positions of the dot 54 indicated on cam 28.

The position of the pawl members and 45, shown in Fig. 6, is that position at which the pawl member 45 has been returned to its extreme lowermost'position preparatory to again imparting rotation to the ratchet wheel 41, and pawl 44 is shown as still coacting with ratchet wheel 41 to impart rotative motion thereto. Now, as pawl 44 continues in its downward direction-in coactive engagement with ratchet wheel 41 to impart continued rotation thereto, pawl member 45 is being returned upwardly concurrently therewith in coactive engagement with ratchet wheel 41. This concurrent engagement of pawls 44 and 45 with ratchet 41 will continue for a predetermined interval of time or until pawl members 44 and 45 have traversed angular disin Fig. 7, at which time pawl member 45 has reached the position indicated by the numeral 51 (Fig. 7), thus again providing an overlap of the operative strokes of the pawl members 44 and 45. To complete the sequence, the pawl 45 continues its upward effective movement in coactive engagement with ratchet 41, andpawl 45 is again returned from the position shown in Fig. 7 to its extreme upward position shown in Fig. 1 preparatory to repeating the aforedescribed cycle. By this manner, smooth rotational movement is assured to ratchet wheel 41 as there is no instant at which ratchet wheel 41 is not being subjected to the actions of either one or both of the pawl members 44 and 45.

As long as pawl members 44 and 45 are permitted to remain in operative engagement with ratchet wheel 41 through the biasing action of spring 46, they will, through their reciprocative mo .icns, impart constant rotation to ratchet wheel 41. However, when it is desired to arrest the rotation of ratchet wheel 41, the pawl members 44 and 45 are acted upon by the mechanism brackets 26 and 62.

right (as viewed in Fig. 1) beyond the bracket 62 and carries on its end a knurled roller 63 which comprises a part of the tape engaging means H. A tape pressure means indicated generally as 64, which comprises a U-shaped portion 65 carried on a stud shaft 66 mounted in the bracket 62 is disposed above the roller 63. Loosely mounted on a stud shaft 61 and disposed between thearms of the member 65 is a pressure roller 68.

" The pressure means 64 presses against roller 63 by means of a' spring 69. A thumb portion 1| is provided should it be desired to effect manually the release of the pressure exerted by the roller 68 against the tape I0. A flanged tape guide roller I6 is carried on the bracket 62 adjacent to the roller 63. The tape I0 is passed underneath the guide roller I6, thence between the rollers 63 and 68 of the tape engaging means, then around the hub of the reel I8 of the tape take-up device 34.

The disengagement mechanism shown in Fig. 3 comprises essentially, a pair of bell crank members15 and I6 pivoted at TI and I8 respectively,

to the base 21. Members 15 and I6 are identical in construction but are disposed oppositely to each other, thus presenting the inner confronting ends of arms I9 and 8| thereof into substantially contiguous relationship. The extremities of arms I9 and BI are provided with laterally disposed portions adapted to coact simultaneously with a plunger 82 secured to one end of a release cable or push wire 83 slidably operable in a conduit 84 extending between a terminal clamp 85 mounted on base 21 of the tape advancing device, and a terminal clamp 86 (Fig. 8) mounted on a bracket associated with the printing apparatus. Of course, the cable 83 and plunger 82 are connected in any suitable and well-known manner, such that when pressure is applied to the cable at the printing apparatus, plunger 82 will be partially ejected, thus imparting, simultaneously, rotative motion to bell crank members I5 and I6 against the tendencies of a spring 81, extending between arm 88 of hell crank member I6 and depending arm 89 of pivoted member 9| (Fig. 2).

The rotative motion thus imparted to bell crank members I5 and 16 by the plunger 82 acts to spread the pawl members 44 and 45 against the action of their common spring 46 to effect the simultaneous disengagement of pawl teeth 48 and 49 from the ratchet wheel 41. Nevertheless, reciprocative motion is still being imparted to pawl members 44 and 45 by cam 28, the pawl members being guided at their lower ends by a guide member 92 having'bifurcated ends to accommodate pawl members 44 and 45. Carried upon the guide member 92 are a pair of stops 93 and 94 against which the bell crank members 15 and I6 abut due to the action of the spring 61 when the pressureupon plunger 82 is relieved. When this occurs, pawl members 44 and 45 are reengaged under the action of spring 46 with the ratchet wheel 41.

The pivoted member 9|, shown in Fig. 2, is provided with a laterally or forwardly disposed portion 89 which cooperates with ratchet wheel 4'! to serve as a detent therefor when the pawls 44 and 45 are disengaged therefrom. As bell crank I5 (Fig. 3) is rotated through the action of plunger 82 as previously described, its arm I4 coacts with arm 89 of member 9|, causing the ously rotated by the motor.

said patent, the selector cam assembly I03 is friclatter to rotate in a. clockwise direction (as viewed in Fig. 2) to bring the portion 80 into engagement with the teeth of ratchet wheel 41 substantially simultaneously with the disengagement of pawls 44 and 45. This braking or detent feature is essential because without it the tape take-up device 34, which is constantly tending to rotate due to its operative connection with constantly rotating pulley 29, will tend to impart rotation to ratchet wheel 4'! by pulling the tape I0 through the tape engaging device Il, thus tending to defeat the purpose of the invention. Having reference now to Fig. 8 which illustrates the control mechanism for the tape advancing device associated with the printing apparatus, only so much of the printing apparatus is herein shown in Figs. 8 and 10 as is necessary to disclose the present invention. For a more comprehensive understanding of the detailed construction of this printing apparatus, reference may be had to the aforementioned patent. Briefly, the printer I2 comprises a base 95 (Fig. 9) upon which is mounted a continuously running motor (not shown), the pinion 96 of which is shown carried on the motor shaft 91. superposed above the motor compartment are the selector discs and selector members (not shown) which occupy the portion indicated generally as 98. Above this portion is disposed the type basket indicated generally as 99, which, as disclosed in said patent, comprises a series of vertically disposed type bars arranged in two substantially semi-circular groups disposed one on each side of the directional movement of the tape, each type bar being adapted to be rotated inwardly and downwardly toward a common printingzone to effect printing upon the recording medium which enters through a suitable conduit 'I M provided therefor. As previously mentioned, the tape I0, after passing through the said printing zone is directed through the projection device I4 (Fig. 11). The printing apparatus I2 is of the single magnet selector type having a single magnet I02 which coacts with a selector cam assembly I03 carried on a vertically disposed shaft I04 which, through worm gear I05 (Fig. 8) and pinion 96, is continu- As fully described in tionally connected to shaft I04 and is provided with a stop disc I06 which abuts a stop gate I01 (Fig. 9) which, in turn, is prevented from swinging by a stop gate latch I08, the latter being controlled by a bell crank member I09 cooperatively associated with the armature extension of the selector magnet I02.

As is well known, a printing apparatus of this type is selectively operated by means of equal length letter codes or equal length code combinations of signalling conditions or impulses and in which the elements carried on the main oper ating shaft I04, are adapted to make one complete revolution each time a character is to be printed. Printers of this type are operatedon the startstop principle, wherein each group of selecting or code impulses is preceded by a start impulse and followed by a stop impulse, the function of which primarily is to maintain unison between the transmitting apparatus and the receiving apparatus. Since the normal stop condition of the signal line is markingmr current, selector magnet I02 is normally energized and its armature lever is normally attracted so that upon the receipt of a start signal, which is of a spacing or nocurrent nature, it will be deenergized momentarily, thus releasing its armature lever, which causes the bell crank I09 to rotate slightly in a counterclockwise direction, causing latch I06 to rock slightly in a clockwise direction, and permitting disc I06, which receives its motion from the shaft I04, to

'swing the stop gate I01, thus permitting the selector cam assembly to make one complete revolution, the stop gate I01 in the meantime being returned to its normal position by a spring (not shown) to be again latched thereat by latch I06 during the stop condition of the signal line.

Shaft I04 is carried by anti-friction bearings (not shown) mounted in brackets III and II2 and carries various cam and clutch assemblies which are described in detail in said patent, with the exception that cam assembly indicated generally as I I3 has been added for the purpose of the present invention; As disclosed in said patent, the flanged sleeve I I4 is fixed to the shaft I04 for rotation therewith and comprises a part of a combination friction and grab clutch generally indicated as H5. The driving portion II6 of the tooth or grab clutch, also fixed to the shaft I04, is adapted to rotate with portion H4. A disc II1, together with a pair of felt washers are interposed between the portions I I4 and I I6 so that, due to the pressure exerted by a helical spring II8, the disc II1 tends to rotate due to the frictional relationship of the parts mentioned, until the stop lug IIB thereon abuts stop arm I2 I The illustration in Fig. 8 shows the parts which are carried upon the main shaft I04 in a position in the course of their rotation, the stop position of the lug IIQ- being indicated, in dotted lines, as abutting arm I2I. The driven portion I22 of the grab clutch is shown engaged with the driving portion II6, but when the stop lug H9 has reached the stop position in engagement with arm I2 I, the cam portion I23 on the driven portion of the clutch I 22 will have reached a point in engagement with the follower roller I24 carried on a bracket I25 fixed to frame I26 of the printing apparatus, in which position the portion I22 will be cammed upwardly against the compressive action of a' helical spring I21 to effect the disengagement of the driven portion I22 from the driving portion H6, which is the normal stop position of clutch I I5. To illustrate further, for purposes of clarity, the action of the'combination friction and grab clutch II5, it will be assumed that arm I2I has been actuated to become disengaged from thelug H9, whereupon disc H1 is initially rotated by reason of its frictional connection with shaft I04. Member I22 is also rotated initially by disc II1 through lug I20 thereon until'the cam portion I23 passes beyond roller I24, in which event the member I22 is urged by spring I21 into meshing engagement with driving portion II6 of the grab clutch, the latter being effective for substantially the remainder of the rotation to impart positive movement to a cam member I3I operatively connected thereto, or until cam portion I23 again coacts with roller I24 to disengage the grab clutch and lug III! will again be arrested by arm I2I to arrest the action of the friction clutch.

Mounted above the portion I22 of the grab clutch is the multi-cam member I3I which is :onnected with said portion I22 for rotation therewith by tongue and groove means. By having reference to said patent, it will be noted that the multi-cam I3! is provided with two cam grooves to control various printing functions. In practicing the present invention, cam groove I32 is employed as one of the pair'of control cams, and is adapted to coact through a follower roller I33 with one end of a lever I34 pivoted at I35 to the frame I26 for operating lever I34. The outer end of lever I34 is provided with a shoulder screw I36 which operates reciprocatively in a slot I31 of a link I38. The lower end of link I36 is pivotally connected to arm I39 of a bell crank lever I4I pivoted at I42 to a bracket I43 fixed to frame I26. Arm I44 of lever I4I carries a camfollower roller I45 which coacts with the periphery of a cam I46 adapted to rotate through frictional interconnection with shaft I04. Lever I4I normally tends to rotate in a clockwise direction under the action of a spring I41 distended between arm I39 thereof and bracket 90. Cam disc I46 has integral therewith a vertical lug I48 which cooperates with a stop arm I49 to arrest the rotation of cam disc I46.

Arm I49 is pivoted on a fixed vertical rod II carried in .the printing apparatus and is adjustably secured by slot-and-screw adjustment I52 to arm I53 of a bail I 54 also carried .on rod I5I.

Bail I54 is also provided with an arm I55 which has a cam surface I56 (Fig. 10) which cooperates with lug III) to effect at a predetermined instant in the cycle of operations, asiwill hereinafter appear, a slight counterclockwise rotation to bail I54 to effect in turn the release of lug I40 from the stop arm I49. Bail I54 normally tends to rotate in a clockwise direction under the action of a coiled spring I51 encircling the rod I M as indicated in Fig. 8.

Stop arm I2I, previously alluded to, is a part of bail member I6I pivotally mounted on the rod I5I. Having reference to Figs. 8 and 10, it is noted that arm I2I is provided with a lateral projection at the extremity of which is carried an adjustment cam screw I62, the function of which is to adjust the operative relationship between arm I55 and bail I6I so as to procure the proper coaction between lug I I9 and cam surface I56. Bail I6I normally tends to rotate'in a clock-' wisedirection due to the action of a spring I60 distended between arm I2I and the frame of the printing apparatus.

As noted in Fig. 10, bail I6I is provided with an arm I 63 which coacts with a pair of shoulders I64 and I65 on arm I66 of a lever I61 pivotedat I68. The extremity ofarm I69 of lever I61 is provided with a-cam following portion I1I which coacts with a release cam I12 associated with the selector cam assembly I03. Lever I61 normally tends to rotate in a clockwise direction, as viewed in Fig. 10, by a spring I13 acting to hold arm I 66 into cooperative engagement with arm I63 of bail- I6I such that when arm I63 engages shoulder I64, portion In is presented in the circumferential path' of release cam I12. When, during the cycle of operation of selector cam assembly I03, cam I12 coacts with portion "I to rotate it slightly in a counterclockwise di- 'rection against the action of spring I13, shoulder I64 will become disengaged from the extremity of arm I63, thus permitting bail I6I to respond to spring I60 to be rotated slightly'in a clockwise direction until the extremity of arm I63 engages shoulder I65. This movement of bail I6I effects the disengagement of arm I2I from lug I I9, thus initiating the rotation of cam disc II1 which, as previously noted, rotates for a brief period under the action of the friction clutch until cam I23 rides out of engagement with roller I24 to permit the engagement of the grab clutch members 6- portion of its revolution, it cooperates with cam portion I56 to effect the counterclockwise rotation of bail I6I to release cam disc I46 for rotation. It is thus seen that the initiation of the cam disc I 46 follows the initiation of disc H1, and. hence grooved cam member I3I, so as to produce an out-of-phase relationship between the cams I46 and I3I. As cam II1 continues its rotation, lug II9 eventually is arrested after a single cycle of rotation by stop arm I2I, but cam I46 continues to rotate thereafter for a short period until lug I48 is arrested by arm I49, thus enabling a predetermined further action of the feeding means I1. This out-of-phase relationship is utilized in actuating levers I34 and MI in such mannerthat during the continuous outof-phase rotation of, cams I3I and I46, link I38 will be maintained substantially quiescent in its vertical uppermost position, which is that position shown in full lines in Fig.8.

During the inoperative or rest period of the printing apparatus, levers I34 and I H assume the dotted line positions shown in Fig. 8 and link I38 assumes its lowermost position, and in so doing, depresses the cap member I15 of cable 83 to the dotted line position, imparting corresponding downward movement to plunger I16 and cable or push wire 83 to effect, as previously described, through hell cranks 15 and 16 (Fig. 3), the disengagement of pawls 44 and 45 (Fig. 2) from ratchet 41. Now, upon the initiation of rotation of disc H1 and cam I3I in response to the disengagement of stop arm I'iI from lug II9, lever I 34 will be actuated to its solid line position in Fig. 8 and thus carry, by means of the stud screw I36, link I38 upwardly, at the same time imparting counterclockwise motion to lever I4I against the action of spring I 41 independently of cam I46, in this manner holding cam follower I45 out of engagement with the periphery of cam I46.

As before noted, the rotation of cam I46 begins subsequent to the rotation of cam I3I and after rotating a short distance, cam I46 engages follower I 45 and acts to maintain for a predetermined definite period, lever I4I in its full line position while cam I3I at the completion of its rotation tends to rotate lever I34 again into its dotted line position. Stud screw I36 will now occupy the position at the lower part of slot I31, link I38 being maintained in its uppermost position solely by means of cam I46. During successive cycles of operation, the cams I3I and I46 are rotating substantially continuously, thus maintaining the out-of-phase relationship between cam groove I32 and periphery of cam I46 so that levers I34 and I act alternately to maintain link I38 in its uppermost position, un-

der which condition the pressure is relieved from tation of cam I3I is first arrested by the abutment of lug II8 upon stop arm I2I, and lever I34 assumes the dotted line position shown in Fig. 8 with the "boulder screw I36 located at the bottom of slot I31. Subsequently thereto the rotation of cam I46 is arrested by the abut- I38, whereupon pressure is again applied to cap member I15 actuating the push wire 33 to effect, through hell cranks 15 and 16, the disengagement of pawls 44 and 46.

General operation.

Briefly, during the inoperative condition of the printing apparatus; that is, that condition which obtains upon the cessation of signal reception, the link I38 is held in its lowermost position by spring I41 to apply pressure to push wire 83 to maintain, through hell cranks and 16 (Fig. 3), the pawl members 44 and 45 out of engagement with ratchet wheel 41 and'the detent 38 in engagement therewith. However, during the continuance of this condition, the motor 2| of the tape advancing device is continuously running and through pinion 22 and gear 23 rotates operating cam 28 and pulley 28, thus causing, through cam 28, the pawl members 44 and 45 through their respective levers 31 and 38 to reciprocate ineffectively, and tending, through pulley 29, to rotate tape reel I8 to take up the tape between the tape engaging device I1 and said reel.

Now, upon the reception of code signals for the initiation of printing operations corresponding thereto, the start signal will deenergize the normally energized selector magnet I02, causing its armature lever to trip latch I88 through the medium of hell crank I09, to permit the rotation of selector cam assembly I63 by the removal of the restraint of stop gate I81 on disc I36 (Fig. 9). As the cam assembly I83 rotates, release cam I12 (Fig. 10) will, in timed relation with the selective operations, coact with cam portion I" to rotate lever I61 against the action of spring I13 to efiect the disengagement of shoulder I64 from arm I63 of bail I6I. Bail I6I is then permitted to rotate slightly in a clockwise direction by the action of spring I68. The movement of bail I3I effects the release of disc I I1 for rotation by disengaging stop arm I2I from lug IIO.

As previously mentioned, disc II1 rotates a short distance due to friction until grab clutch H6 and I22 are permitted to engage. Under the positive driving action of the grab clutch, cam I3I continues in its rotation. Lever I34, due to the conformation of cam groove I32v shortly thereafter is rotated from its dotted line position shown in Fig. 8 to its solid line position, and through shoulder screw I36 raises the link I33 and rotates lever I4I therewith against the action of spring 1. Push wire 83 is thereupon freed, to be acted upon by spring 81 (Fig. 3) through bell crank members 16 and 16, thus re moving the restraint upon pawl members 44 and 45 (Fig. 2) and permitting the engagement of their respective pawl teeth 48 and 48 with ratchet 41. engaged from ratchet wheel 41.

Due to the reciprocating'movement of pawl members 44 and 45 and the overlap relationship between operative periods of teeth 48 and 48 upon ratchet 41, as previously described, uniform rotative motion is imparted to ratchet wheel 41 in a counterclockwise direction (as viewed in Simultaneously therewith detent. 33 is dis- Fig. 2), thus imparting like rotation to the tape engaging roller 63 whereby, through the cooperation of pressure roller 38, the tape I8 is, d

' code signals, cam, I 46 has been provided, as previously described, which is operative in out-o!- phase relation with cam I3I; thatis, while lever I34 has been returned to its inoperative or dotted line position, the tape advancing device is nevertheless maintained in actuation for a short period between signal code combinations; otherwise the tape advancing device would be actuated intermittently in timed relation to the reciprocal action of link I38. However, this reciprocal action of link I38 during the reception of successive code signals has been prevented by the out-ofphase relationship between cams I3I and H6. Thus, after lug II9 has traversed a predetermined distance, it coacts with cam portion I56 to rotate bail IN to effect the release of arm I49 from lug I48, thereby permitting cam I46 to rotate, which rotation during a single operation will continue for a period after cam I3I has come to rest. However, due to the out-of-phase relationship herein described, disc Ill, and hence cam I ill, will have been reinitiated into further operation before cam I46 has arrived at its normal stop position. Therefore, the contour of cam I46 is so conformed that when cam I3I has rotated lever I34 to its dotted line position, lever I will be acted upon by cam I46 to maintain link I38 in its uppermost position, thus preventing link I38 from pressing upon cam I15 and acting upon push wire 83. So, during successive cycles of operation, lugs H9 and I43 will be released foroperation in timed relation to effectuate the out-of-phase operation of cams I3I and I46.

Finally, upon a cessation of selective conditions,

cam I3I will first arrive at its stop position to actuate lever I34 to its dotted line position followed shortly afterward by the arrestment of cam I46 by the coaction of lug I48 with stop arm I49 to permit lever I to be acted upon by spring I" to actuate link I38 to its lowermost position, thus applying pressure to cap I15 to push the cable 83 against arms 19 and 8| of bell cranks I5 and I6 to again effect the disengagement of pawls 44 and 45 from ratchet wheel 41 and the engagement of detent 60 therewith, causing the inaction of tape engaging device II.

Manifestly, a tape advancing device has been provided which is responsive to code signalling impulses and which produces a smooth and continuous movement to the tape. It is, of course, understood that the invention is capable of embodiment in many other forms than that specifically disclosed without departure from the spirit and scope of the invention as defined in the appended claims, -or which may come within the scope of equivalency.

What is claimed is:

1. In combination, a printing telegraph receiver comprising a mechanism'selectlvely responsive to signalling conditions for determining a character to be printed on a medium, a device for advancing the medium through the receiver, and an allmechanical means effective during the operation of the receiver and during a predetermined cessation thereof for causing the continuous operation of said medium advancing device.

3. In combination, a printing telegraph receiver comprising a mechanism selectively responsive to signalling conditions for determining a character to be printed on a medium, a device for advancing the medium through the receiver, a motor for driving said device, means contained in said receiver for controlling the effectiveness of said motor drive on said device, and an all-mechanically operated mechanism controlled .by said means for insuring the continued operation of said device during a momentary non-operativeness of said receiver.

4. In combination, a printing telegraph receiver comprising a mechanism responsive to signalling conditions for selectively determining a character to be printed on a strip, a pair of elements efie'ctive for each character selection, a device for advancing the strip continuously including a motor actuated mechanism, and means controlled by said pair of elements for controlling the continued actuation of said motor actuated mecha- IllSm.

5. In combination, a telegraph printing mechanism selectively responsive to received permutation code combinations of current impulses operative to record characters on a tape, a tape moving means, a plurality of cams, means dually controlled by said cams for controlling the operaoperable elements efiective for each character selection, a device for advancing the strip continuously including a motor actuated mechanism, and means controlled by the orit-of-phase operation of said pair of elements for controlling the continued actuation of said motor actuated mechanism.

7. In combination, a telegraph printing mechanism selectively responsive to received permutation code combinations of current impulses operative to r'ecord characters on a tape comprising a first yclicallyoperable means and asecond cyclically operable means, said first means controlled by said impulses and said'second means controlled by said first means whereby both said means operate in out-of-phase relation with respect to each other, a tape moving means, and means controlled bysaid first and second means for controlling the continued actuation of said tape moving means.

8. In combination, a recorder responsive to equal length letter codes adapted to make a record on a tape and comprising a signal responsive means, a first cyclically operable means controlled by said means, and a second cyclically operable means controlled by said first cyclically operable means, a tape moving means, and means controlled by said first and second cyclically operable means for controlling the continued actuation of said tape moving means.

9. In a news exhibiting apparatus comprising a telegraph printing mechanism selectively responsive to received permutation code combinations of current impulses operative to record characters on a tape and embodying a pair oi elements, each making a cyclic movement for each received code combination, and means to impart continuous movement to the tape comprising a motor actuated mechanism controlled by the out-of-phase operation of said pair of elements.

10. In a tape actuatoF, a first member operable under certain operating conditions, a second member operable under other operating conditions, a pair of elements operable reciprocatively by said first member whereby the initial portions and final portions of the operative strokes of said elements overlap to insure uniform continuous operation of said second member, and means for controlling the continued actuation of said second member.

11. In combination, a printing telegraph receiver, a motor actuated tape advancing device, a motion-transmitting means extending therebetween, cam controlled means in said receiver for acting upon said means, mechanism in said device acted upon by said motion-transmitting means, and cam means for controlling said cam controlled means to effectuate through the control of said motion-transmitting means the continued actuation of said advancing device.

12. In combination, a printing telegraph re-' ceiver, a motor actuated tape advancing device, a motion-transmitting means interpositioned between said receiver in said device, a pair of elements in said receiver effective for each printing operation, ratchet drive means in said advancing device acted upon by said motion-transmitting means, and means controlled by said pair of elements for acting upon said motion-transmitting means to control through said ratchet means the continued actuation of said advancing device.

13. In a tape actuator, a continuously rotating cam element, a pair of pawl means continuously reciprocated by said element, and a tape engaging device comprising a ratchet wheel adapted to be continuously rotated by said pawl means, the initial and final portions of the operative strokes of said pawl means adapted to overlap to insure the continuous rotation of said ratchet wheel.

be continuously rotated by said pawl means, the initial and final portions of the operative strokes of said pawl means to overlap to insure the continuous rotation of said ratchet wheel, and means controlled by said mechanism for controlling the continued actuation of said engaging device.

15. In combination, a telegraph printing mechanism selectively responsive to received permutation code combinations of current impulses operative to record characters on a tape a tape moving means, a pair of sequentially initiated rotatableelements having overlapping cycles of operation, and means controlled by said elements for controlling the continued actuation of said tape moving means.

16. In combination, a printing telegraph receiver comprising a mechanism responsive to signailing conditions for selectively determining a character'to be printed on a strip, a pair of elements effective for each character selection, a device for advancing the strip continuously including a continuously rotating cam element, a pair ofpawl means continuously reciprocated by said element, in engaging device for-said strip comprising a ratchet wheel adapted to be continuously rotated by said pawl means, the initial and final portions of the operative strokes of said pawl means adapted to overlap to insure the continuous rotation of said ratchet wheel, means controlled by said pair of elements for controlling the continued actuation of said engaging device, and means effective upon the controlled inaction of said engaging device by said pair of elements to look said ratchet wheel against rota tion.

17. In combination, means for printing upon a record strip, plural cam means operable secausing said motor to operate said feeding means in response to the operation of the second recited means from normal position, and means for suspending the return of said second recited means to normal position to enable said feeding means to feed the record strip through a predetermined additional extent.

19. In combination, means for printing upon a record strip, an element movable in each cycle of operation of said printing means, strip feeding means, control means responsive to a certain di-' rectional movement of said element for bringing said feeding means into action, and means for suspending the movement of said element in an-" other direction to enable a predetermined further action of said feeding means.

20. In combination, means for printing upon a record strip, means for feeding said record strip, means constantly tending to operate said feeding means, and means including a pair of sequentially initiated rotatable elements having overlapping cycles of operation efiective uponthe inaction of said printing means for rendering said operating means ineffective to actuate said feeding means and for locking said feeding means against actu- I ation.

21. In combination, a printing telegraph re-' ceiver comprisinga mechanism responsive to signalling conditions for selectively determining a character to be printed on a strip, a' pair of sequentially initiated rotatable elements having overlapping cycles of operation eflfective for each character selection, a device for advancing the .strip continuously including a motor actuated mechanism, and means controlled by said pair of elements for controlling the continued actua- 1 tion of said motor actuated mechanism.

22. In combination with a telegraphic device,

a tape moving means, a plurality of cams, means controlled by said cams for controlling the operation of said tape moving means, and mechanical means effective with said cam controlled means for controlling the continued actuation of cams for controlling the operation of said tape" moving means, and means eil'ective with said cam controlled means for controlling the continued actuation of said tape moving means.

24. 'In a telegraphic device responsive mag 1s a motor actuated means, and means controlled by the out-of-phase operation of said first and second means for controlling continued actuation of said motor actuated means.

26. In combination with atelegraphic device responsive to signalling conditions, a strip advancing means, a'continuously rotating cam element, a pair of pawl means continuously reciprocated by said element, a strip engaging device comprising a ratchet wheel adapted to be continuously rotated by said pawl means, the

initial and final portions of the operative strokes ot said pawl means adapted to overlap to insure the continuous rotation of said ratchet wheel,

and signal controlled means to render said pawl means ineffective.

27. In combination with a telegraphic device responsive to signalling conditions, a strip advancing means, a continuously rotating cam ele ment, a pair of pawl means continuously reciprocated by said element, a strip engaging device comprising a ratchet wheel adapted to be continuously rotated by said pawl means, the'initial and final portions of the operative strokes of said pawl means adapted to overlap to insure the continuous rotation of said. ratchet wheel, signal controlled means to render said pawl means ineffective, and means controlled by said signal controlled means to lock said ratchet wheel.

28. In combination, a strip advancing means, a first member operable under certain operating conditions, a second member operable under other operating conditions, a pair of elements operable reciprocatively by said first member to 10 impart, through an overlap of their operative strokes, continuous movement to said second member, and means for controlling the continued movement of said second member.

29. In combination, a strip advancing means,

a first member operable under certain operating conditions, a second member operable under other operating conditions, a pair of elements operable reciprocatively by said first member to impart,

through an overlap of their operative strokes,

continuous movement to said second member, means for controlling the continued movement of said second member, and means controlled by said last recited means to lock said second member against movement.

30. In combination, means for printing upon a record strip, a first cam means operable in each cycle of operation of said printing means, a continuously running motor, and a second cam means having its initiation into rotation controlled sequentially by said first cam means in said'cycle' of operation for causing said motor to feed said strip a predetermined amount following I each printing operation.

WALTER J. ZENNER.

HOWARD L. KRUM.

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