US2189541A - Printing telegraph apparatus - Google Patents

Description

Filed March 26, 1938 FIG.2

INVENTOR. CHARLES W. BURCKY I A ATTORNEY.

&\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ 3 7 4 2 G I.- 3 l l F 8 3 3 M 4 2 2 2 O 2 5 5 6 9 a 9 o m 3 0 7 G F Patented Feb. 6, 1940 PRINTING TELEGRAPH APPARATUS Charles W. Burcky, Chicago, 111:, assignor to Teletype Corporation, Chicago, 111., a corporation of Delaware Application March 26, 1938, Serial No. 198,178

1 5 Claims.

' a plurality of spaces automatically, the time incident the movement of the carriage between 1 the respective tabulator positions is a factor which must be considered for satisfactory and reliable operation. Operation from an automatic tape transmitter requires special provisions to suspend operation of the transmitter during the tabulating period and to start the transmitter promptly upon the arrival of a carriage to the desired tabular position.

The main object of the invention is the provision of control instrumentalities for use with tabular recording whereby the period transmission is suspended is minimized with a consequent reduction in the loss of line time occasioned by such operation.

A further object of the invention resides in the provision of a system arranged for tabular operation whereby-.transmission from the automatic transmitter is resumed by a condition established function. As disclosed in the aforementioned patent, the spacing mechanism of the printing telegraph receiver includes a multi-toothed ratchet adapted to cooperate with a pair of pawls actuated by a printing bail to function as an escapement mechanism so that upon each revolution of its main shaft the spacing worm gear integral with the spacing ratchet is permitted, under normal operating conditions, to escape one tooth at a time, and hence to rotate through a corresponding angle.

As, also disclosed in. the cited patent, a series of function levers is provided. These levers cooperate with a series of selector vanes which are set permutably in accordance with the character of the received code combination signal. Included in the group of function levers is a particular lever which has been identified as a tabulating function lever. When the tabulating function lever is selected, mechanism is operated whereby the upper spacing pawl is moved out of engagement with the tooth of the spacing ratchet, at which time itsfront end is lowered, thereby unlatching the tabulating bar to permit it to be at a station of the system remote from the station at which the transmitter is located.

A feature of the invention resides in the control of interruption of transmission from the transmitter which has been stopped due to the presence of a tabulating signal in the control record and of resumption of transmission by a printing telegraph receiver located at a station remote to that of the transmitter. Such an arrangement possesses the outstanding adva-ntages that line time is materially conserved and that a remote printer is utilized as the control instrurn'entality for the resumption of tre-ismission following tabulation.

The above and other objects of the invention are accomplished by the provision in a printing biased by its spring toward the type carriage. With the upper space pawl thus disengaged, the lower space pawl returns to its normal position free of the teeth on the spacing escapement ratchet, which, permits the spacing worm to make one complete revolution instead of only one-third of a revolution during the time that the main shaft rotates through one revolution. Consef 'quently, the carriage will be spaced continuously telegraph apparatus of the form disclosed in U. S.

' Patent No. 1,904,164 of tabulating mechanism which includes a tabulator bar extending across the front of the machine and which is carried by rackets mounted in the typing unit and capable of oscillation toward or away from the type carriage. Carried on the tabulator bar are a number of adjustable stop control members which determine the position at which the type carriage may be automatically spaced through a plurality of character spaces upon the reception of a code signal combination identified with the tabulating a distance for each revolution of the main shaft, which is three times that of the normal spacing distance. p

The movement of the type carriage is arrested at the desired tabulating position by permitting the upper space pawl to engage with a tooth. on the spacing ratchet. The latter function is effected by the coaction of a cam mounted on the type carriage and one of the adjustable stop control members secured to the tabulator bar. The tabulator bar is thus cammed forward or away from the carriage against the action of its spring, and in so doing, permits the aforementioned mechanism to be restored to its nomal position in latched engagement with the tabulator bar.

described will be repeated.

ingly, the present invention provides instrumentalities for the suspension of transmission upon the presence in the control record of a tabulator signal or a particular arrangement of the perforations in the control record or strip. When such perforations are sensed, certain instrumentalities respond tocontrol the energlzation of a relay whereby operation of the transmitter or distributor is suspended temporarily following the transmission to the connected line circuit of the code combination signal identified with the tabulatlng function which effects operation in the printing telegraph receiver connected to the line whereby its carriage will be advanced automatically to the desired tabular position. Following the transmission of the code combination signal identified with the tabulator function and with the transmitting distributor in its normal position, a relay is held energized by current flowing in the line circuit. Each of the receiving printers connected to the line circuit is equipped with a pair of contacts which are included in the line circuit; that is, the line circuit extends through such contacts. When a carriage of one 'of the printers arrives at the desired tabular position as determined by the position of the stop members on the tabulator bar, mechanism is operated whereby the noted contacts are opened. Opening of such contacts opens the line circuit and causes the deenergization oi the relay at the transmitting station. whereupon circuit conditions are established to restart the transmitter and effect resumption of transmission to the re ceiving printers connected to the line circuit. Transmission continues until a tabulator signal is sensed. whereupon the operations previously A better understanding of the invention may be had from the following description when taken in conjunction with the accompanying drawings, wherein Fig. 1 is a front elevational view of the principal part of the printing telegraph receiver showing the application of the tabulating mechanism thereto supplemented with a schematic circuit diagram illustrating the control instrumentalities of the transmitter which may be located at a station remote to that at which the receiver is located;

Fig. 2 is a transverse sectional view of the receiving printer taken approximately on line 2-2 of Fig. 1;

Fig. 3 is a cross-sectional detail view taken approximately on line 3--3 of Fig. 1;

Fig. i is a sectional detail view taken on line 4--4 of Fig. 1; and

Fig. 5 shows diagrammatically a detail of the tape transmitter embodied in the transmitting apparatus located at a transmitting station.

The present invention has been applied to a receiving printer of the construction shown in U. S. Patent No. 1,904,164 issued April 18, 1933, to S. Morton et al. and consequently for the details of such a printer reference should be made to such patent.

The printing telegraph receiver to which the present invention has been applied includes a primary selecting mechanism of which only the single selector magnet 8 has been shown. However, such selecting mechanism is of the swordand-T-type disclosed in U. S. Patent No. 1,745,633 to S. Morton et al. which, incidentally, is fully and completely disclosed in Patent No. 1,904,164

cited previously. Cooperating with the primary nals from the automatic transmitter. Accordselecting mechanism is a secondary selector vane assembly which is indicated generally by the numeral 9. The selector vane assembly 9 controls, through a set of hell crank levers it, a set of curved code bars I l carried in a movable type carriage indicated generally at l2. As set forth in Patent No..1,904,164, the type carriage is movable longitudinally with respect to a stationary platen (not shown), but manifestly the inven tion is not limited to its application to the particular form of receiving printer disclosed in such patent.

Disclosed in Fig. 2 is a main operating shaft 55 to which power is communicated from a continuously operating motor (not shown). Shaft l5 carries a spacing mechanism indicated generally by the reference numeral [6, as well as the selector cam assembly (not shown) which cooperates with selector magnet 3, as fully disclosed in Patent No. 1,745,633. Spacing mechanism l8 controls, through a gear H, a shaft l8, a gear i9, and a racl; 20, the movement or advancement of the type carriage l2 to form character spaces. Such movement tends to wind up a carriage return spring mechanism (not shown) which is effective upon the receipt of a carriage return signal to return the carriage l2 to its normal beginning of line position.

An auxiliary shaft 2! is mounted parallel to but above shaft l5. A number of mechanisms are mounted on shaft 21 such as, for example, printing ball 22, function lever ball 23, and the escapement elements of the spacing mechanism [6. Printing ball 22, which is actuated by a spring 2 at the proper time in the operative cycle. functions to reciprocate a pull bar operatlng member 25 to cause, through a pull bar 26 following its selection, the operation of a particular type bar 21.

The selector vane assembly includes a plurality of vanes 32. These vanes control a series of function levers among which and provided especially for accomplishing the objects of the present invention is a tabulating function lever 33 which, like the other function levers, is pivoted on a common pivot rod 3t and is assembled in a slot in the function lever comb 35. Function lever 33 has an individual spring 36 tensioned between the lever and the printer frame to retate the function lever 33 clockwise about pivot 34. However, the biasing of lever 33 is restrained by the function lever ball 23 acting through rod, 31 on arm 44. Lever 33 has on its arm 38 code notches and projections which cooperate with the vanes 32 of selector vane assembly 8 and which are coded to correspond to the tabulator signal; that is, upon the setting of the vanes 32 in response to the signal identified with-the tabula lng function, function lever 33 will be operated for performing its allocated function.

Mounted on main shaft I5 is a sleeve member 40 which comprises integral therewith a ratchet 39 and a spacing worm 3|, which meshes with gear ll. Sleeve member 40 is operably connected to shaft [5 through a friction clutch (not shown) and through which it is rotated by power from shaft 65, unless blocked by the pawls of the spacing mechanism l6.

From the disclosure of Fig. 2 it is seen that ratchet 39 has three teeth 45, 42, and 33, the escapement of which will allow the type carriage l2 to be moved forward one step or character space for each actuation of printing ball 22. As indicated, the escapement mechanism comprises a pair of pawls and 4B pivotally aieatei mounted on shaft ii and a lever ll! carried by printing bail 22. Spring it normally tends to bias levers 15 and t toward each other, since it has its ends connected to such levers. lever 35 is normally urged by spring 63 in a counterclockwise direction so that its laterally disposed end 5i engages a tooth ll of ratchet 39. Lever it is normally held out of engagement with ratchet 39 opposing the tension of spring 48 by path of tooth 32.

lever 41 whose free end extends into the path of laterally disposed end 56.

Lever #7 is pivotally connected at 52 to printing ball 22 and is provided at 53 with a slot and screw adjustment whereby the correct relative position of escapement levers 45 and 46 with respect to ratchet 39 may be determined.

As is clearly disclosed in Patent No. 1 ,904 164, the spacing operation occurs immediately following or subsequent to the printing of a character in a manner outlined briefly below.

To print a character, printing bail 22 oscillates and, in so doing, controls the operation of lever ll. clockwise movement of lever t7, lever to, under the tension of spring d8, also rotates clockwise to bring the laterally disposed end 57 into the Due to the space indicated at 54 between lever 41 and the disposed end 55 of lever 65, the latter will not be'acted upon and end 5i remains in engagement with tooth 4i. However, on the further clockwise movement of lever ll, the end 55 of arm 45 is encountered and similar movement is thus imparted to lever d5, effecting the disengagement of end 6i from tooth l! and permitting ratchet 39 to rotate slightly in a clockwise direction under the m fluence of the friction clutch which is located intermediate sleeve in and shaft it. The motion thus noted is limited by the engagement of tooth 32 with laterally disposed end 5'! of lever 45, which lever, as was noted, was free to rotate in a clockwise direction under the tension of spring 38 into the path of oncoming tooth t2. Ratchet 39 is thus restrained from rotation by lever 46, while the character is being printed, following which printing bail 22 and associated lever 47 rotate in a counterclockwise direction actuated by a printing cam (not shown) carried on shaft l5. Restraint upon lever 45 by lever QT through end 55 is thereby rempved, permitting lever/45 to rotate in a counterclockwisedirection under the influence of spring 48 into the path of oncoming tooth 43 of ratchet 39. During this counterclockwise movement of lever A? and after the aforementioned removal of restraint upon lever 65, lever to rotates in a like direction due to the movement of arm ill on laterally disposed end 56, thereby disengaging the end 51 of lever it from tooth t2 andvallowing ratchet 39 to continue its rotation until arrested by the engagement of end M of lever t5 with tooth 53. As a result of the operation of the escapement mechanism, there is a period of overlap during which ends 58 and 57, due to the space indicated at 54, are effective simultaneously toprevent the escapernent of ratchet 39, the ends 5! and 57 being otherwise alternately engageable to permit the escapement of ratchet 39. Since worm 3i and ratchet 39 are integrally connected to sleeve 60, it is apparent that worm ill will have normally the same intermittent or step-by-step motion as was previously described as being imparted to ratchet 39. Worm Si is meshed with gear ll mounted on shaft is and may be operatively connected thereto through a jaw clutch During the initial portion of the indicated generally by the numeral 772. Worm Si and gear ii are so related, according to the present embodiment, that one-third revolution of worm 3! will rotate gear ll through a distance whereby, through gear la and rack iii, the type carriage i2 will be advanced a distance of one characterv space.

As is apparent from the previous description, character spacing occurs automatically with the printing of each character. That is, the spacing function is incorporated into the printing operation. It is well known that there is a code combination of signal impulses allotted to each type bar, but it is possible, however, to employ a code combination of impulses commonly known as the space signal which is identified with no type bar but which will, nevertheless, initiate the operation of the printing mechanism. Under such circumstances, spacing between words is accomplished. When a space signal is received in exactly the same manner as described for the operation of a pull bar 26, the printing mechanism functions in identically the same manner, except that a pullbar 2c is not operated and thus no character is recorded. The spacing mechanism will, however, be operated to effect spacing of the type carriage one character space.

With regard particularly to the specific embodiment of the present invention, continuous spacing of the type carriage may be effected upon the receipt of a code combination of signal impulses identified with the tabulating operation. The function of such a signal combination is to initiate the operation of the tabulatlng mecha nism. I

The mechanically operated tabulating mecha nism comprises a tabulating bar 65 which extends across the front of the printing telegraph receiver, as shown in Fig. 1, and which has two depending arms 66 and 61 which are pivotally formed to produce a quick action upon cooperating with a cam element 7d carried by type carriage l2, in order to terminate suddenly the tabulating operation.

Tabulator bar 65 is also provided intermediate the depending portions 56 and Eli andsuitably positioned relative to function lever 33 with another depending portion 15. Attached to and depending from portion i5 is a member t3, the lower end of which is provided with an aper= ture it having its upper lefthand corner (as viewed in Fig. 2) conformedso as to provide a reentrant stepped portion ii. The tabulator bar 55 is normally urged in a counterclockwise direction, as viewed in Fig. 2, by a spring 18 (Fig. 1).

Cooperating with the stepped portion ii is one arm 19 of a lever so plvotally carried at at on a bracket 82 screwed to the function lever comb' 35. The extremity of arm 79 has a laterally disposed portion 8? which cooperates with portion ll of member 83; At the end of arm 86 of lever 86 is carried a vertically extending Bar at has a lonwith an open ended slot adapted to engage a pin 9| secured to escapement lever 45.

Function lever 33 has a horizontal portion 86 so conformed that its extremity 88 engages the lower edge of arm 84 of lever so that when function lever 33 is permitted to rotate in a clockwise direction under the action of its spring 36 due to the proper setting of vanes 32 in response to a signal code combination identified with the tabulating function, the end 88 thereof is raised, causing lever 80 to rock in a clockwise direction against the tension of its spring 92. The end 81 of arm 19 is thereby moved downwardly clear of portion 11, thus permitting spring 18 to urge tabulator bar 65 inwardly (or toward the left as viewed in Fig. 2) until wall 89 of member 83 engages portion 81. Adjustable stops 10 are therefore moved inwardly into the path of cam member 14 which is pivoted at 93 on a portion 94 integrally formed on a bar 95 which is comparable to bar 53 shown in Fig. 1 of Patent No. 1,904,164 and which is employed for retaining the bell crank levers I0 in operative relation to vanes 32. Cam I4, like bar 95 and beli cranks I0, is moved with the type carriage it for carriage spacing and normally tends to rotate in a clockwise direction about its pivot 03, due to the action of its spring 96, but its clockwise rotation is limited by the coaction of stop pin 91 carried thereon with the end of bar 35. Consequently, upon the rightward movement of type carriage l2 (as viewed in Figs. 1 and 4) cam 14, due to its limited rotatability in a clockwise direction will, by its cainming action on stop member 10, rock tabulator bar 65 outwardly, but upon the leftward movement of type carriage I2. cam 14, upon striking the series of stop members 10, will be rotated counterclockwise against the action of spring 30 sufilciently to be inefiective with cam p0rtions13.

Upon the clockwise rotation of lever 80, due to the selection of function lever 33, arm {it and consequently member carried thereby will be raised, and in so doing will, through pin 3i, lift escapement lever 45 free of the teeth of. the ratchet 39 which, since the lever 46 is (after its oscillation by ball 22) prevented from engaging the teeth of ratchet 39 due to being held in its retracted position by lever 41, permits worm gear 3| to make one complete revolution instead of one-third of a revolution during the time that the main shaft I5 rotates through one revolution. Carriage I2 will be spaced continuously a distance per revolution of shaft it: which is three times that of normal spacing, as long as the escapement lever 45 is held out of operative engagement with ratchet 39, which is maintained in this position due to the engagement of portion 81 with the underside of stepped portion 11. Carriage I2 will move continuously until cam 14 co.- acts with one of a series of stops 10, when, through stop 10, cam 14 will urge tabulator bar 65 outwardly or in a clockwise direction, as viewed in Fig. 2, to disengage portion 81 from portion 11, whereupon lever 80 will again be rotated in a counterclockwise direction by its spring 92 into the position shown in Fig. 2. The member 90 carried on arm 84 of lever 80 will again be lowered, permitting escapement lever 45 under the action of spring 48 to engage one of the teeth 4I, 42, or 43 of ratchet 39.

Function lever 33 will be returned to its unselected position at the completion of the first revolution or cycle of operation of main shaft I5 because of the fact that during the cycle,

pursuant to the reception of the tabulating signal, the function lever bail 23 will have been reciprocated once so that rod 31, upon the down stroke of bail 23, will permit spring 36 to urge lever 33 into cooperative relation with vanes 32 only long enough to eiiect the selection and hence the resulting disengagement of pawl 45, whereafter rod 31, upon its upward or return movement, will cam the function lever 33 through arm 44 away from the vanes 32 where it will be held until the reception of another code signal.

During the time that the carriage I2 is moving to efiect tabulation; that is, from the time the tabulation signal is received up to the time when cam 14 engages the next stop 10, the transmission and reception of succeeding character code signals must be prevented, inasmuch as signals I sent or received during the continuous movement of the type carriage for tabulation may not properly effectuate printing. Such a condition is especially true when automatic transmission,

that is, transmission from a perforated tape, is

utilized. Consequently, the present invention has as one of its objects the provision of means for suspending the transmission of code signals during the tabulating operation.

Tabulator bar 65 has a depending tongue 98, the lower end of which cooperates with a bell crank lever 99 pivoted at I00 (Figs. 1 and 3) to a base lill. One arm of hell crank 99 has one surface inclined to cooperate with the beveled end of tongue 93, and the other arm of bell crank 99 engages a pin I02 secured to lever I03 which is also pivoted at I80. EXtEYlCllLI between arms on bell crank 99 and lever I03 is a spring I04. Lever I03 is urged normally by a spring I41 against a stop pin M8 to allow contacts I49 to close. Contacts l4!) are connected in a series circuit with a line conductor I06 and the windings of the electromagnet 8 of the primary selecting mechanism.

Also as disclosed in Fig. 1, the line conductor 506 extends to other printing telegraph stations such as I01! and I08 where a printing telegraph receiver similar to that described above is located. It is, of course, understood that additional stations may also be connected with line conductor I06.

One terminal of the single selector magnet 8 of the primary selecting mechanism is connected to a line conductor I09 extending to a distant station indicated by the numeral H0 where transmitting apparatus of the construction as generally shown in U. S. Patent No. 1,632,297 to E. E. Klelnschmidt may be located. Significant, however, is the fact that according to the present invention, the tape transmitter or tape sensing mechanism is arranged with an extra set of contacts, the function of which will appear hereinafter.

The transmitter shown diagrammatically in Fig. l as being located at station H0 includes a set of tape sensing elements I I I (Fig. 5) which, under the control of a tape or signal storing medium H2, controls a corresponding set of contacts H3 connected directly on one side to a source of current and on the other through individual conductors II4 to segments II5 of a distributor HE. A second set of contacts II1 are also controlled by the tape sensing elements III and are actuated in response to the perforations in tape H2 in the same manner as are contacts H3. However, unlike contacts H3 which impress current from the common source of battery upon any one of the contacts thereof that are closed, certain ones of the contacts H1 are permanently connected. in series to correspond to the predetermined code combination allotted to the figures shift signal and to the predetermined code combination allotted to the tabulation signal. For example, with the contactors H8, Fig. 5, in the dotted line position shown in Fig. 1, which is identified with the figures shift signal, a circuit will be completed extending from battery, through the contactors H8 and the respective contacts H1 in series, conductor H9 and the winding of slow-to-release relay I20 to ground. However, with all of the contactors H8 in the dotted line position except the lowermost contactor, as viewed in Fig. 1, and with such contactor H8 moved to its left-hand position as viewed in such figure,'a circuit will be completed extending through the left-hand front contact of relay I20. n

The distributor H6, in addition to the segments H5, includes a brush arm I2I secured to a shaft I22 to which power is communicated from a continuously operating motor (not shown) through a friction clutch (not shown), a continuous ring I23, and'stop and start segments I24 and I25, respectively. Brush arm I2I, which carries a brush adapted to bridge the segments of the outer ring with ,the continuous ring I23 which is connected to line conductor I09, is normally held against rotation by the armature I26 of stop magnet I21 which has its winding connected with battery I28 through a manual switch I20 and the extreme left-hand armature and back contact of relay I30. With switch I29 closed and with relay I30 deenergized, electromagnet I21 will be energized and armature I26 will be held out of the path of brush arm I2I.

Also secured to shaft I22 are two cams I3I and I32. Cam I3I cooperates with pivoted arms I33 and I34 to control certain electrical circuits, as will be later described, while cam I32 operates a pivoted arm I35 against the tension of a spring I36 to hold mechanically armature I31 of an electromagnet I38against its pole pieces. in Fig. 1, arm I35 is held out of engagement with armature I31 when shaft I22 is in its normal or arrested position. Immediately that shaft I22 moves from its rest position, arm I35, by the action of its spring I36, engages armature I31 and moves it mechanically against the pole pieces of relay I30.

In addition to relay I30, a relay I40 is provided which controls, through its upper armatures and back contacts, an energizing circuit for the upper winding of relay I38 and through its lower armatures and front contacts the energlzing circuit for the lower windings of relay I38. The armatures of relay I40 are adjusted such that contacts are made before the others are broken; that is, the contacts shown in Fig. 1 as normally closed are maintained closed upon theenerglzation of relay I40 until the front contacts thereoi are closed.

When a figures shift signal appears in tape H2, sensing elements III operate to set contacts II3 and contactors H8. Through contacts H3 and the operation of distributor H6 a code combination of impulses identified with the figures shift signal will be transmitted over line conductors I09 and I06 to the printing telegraph receiver shown in Fig. 1- and the printing telegraph receiver located at stations I01 and I 08, respectively. Such printing telegraph receivers respond to their selecting mechanisms in accordance with the transmitted code combination As shown of signaling impulses. Through contactors H3 a circuit is completed for relay I20 extending from grounded battery, through contacts I II and contactors H8 which will be in the dotted line position, the circuit controlled by arm I33 will be open. Current continues to flow through the winding of relay I20 from battery connected to contactors H0, for the contactors H8 remain in engagement with the contacts I II for the greater part of the cycle of distributor H6 or until the tape sensing elements III are withdrawn from the tape which occurs near the end of the cycle of distributor H3. Relay I20, however, is slow to release and retains its armatures in their attracted position until arm I33 engages its con tact due to the action of cam I3I, when a locking circuit for relay I20 will be completed extending from grounded battery, through arm I33, righthand armature and front contact and winding of relay l20'to ground. Relay I20 will thus be maintained energized.

Following the transmission of the signal impulses for the figures shift signal, the tape II 2 will be advanced through mechanism provided therefor to present the next transverse row of code perforations in alignment with the sensing elements III. If the next transverse row of perforations corresponds to the tabulation signal, the contacts III? will be correspondingly set and a circuit will be completed whereby relay I30 will be energized. This circuit may be traced from grounded battery, through the contacts III! and contactors H8, left-hand front contact and armature of relay I20 and the winding of relay I30 to ground. Relay I30, in energizing, opens atits left-hand armature the energizing circuit for electromagnet I21 which is thereupon deenergized and armature IE3 is moved into the path of brush arm IZI so that upon the completion of the cycle of rotation of brush arm IEI, it will engage the latch on armature I23 and will be held against rotation pending the energization of electromagnet IZ'I. lay I 30 extends from grounded battery, through element MI under the control of relay I30, middle armature and front contact and winding of relay I30 to ground. Relay I38 is thus held energized. Through the extreme right-hand armature and front contact of relay I30 a circuit extends to re lay I33 which will he energized, when cam I 3i is in its normal or arrested position and pivoted member I33 is in engagement with the electrical contact associated therewith. The back con tacts of relay I40 are maintained closed pending the closure of the front contacts thereof so that for an instant current flows through both sets of windings of relay I33. With the upper back contacts of relay I30 opened, relay I33 is main== tained energized since current now fiows from. grounded battery, through segment I23, the brush carried by brush arm IEI, ring I23, armature I 42 of relay I30, lower windings of relay I33, armature I43 of relay M0, line conductor its,

Winding of the single selector magnet 8, contacts I49, line conductor I06, and through the printing telegraph receivers located at stations I01 and I08 which have their printing telegraph receivers equipped with contacts I44 and M corresponding to contacts I49. Relay I38 is thus maintained energized and the locking circuit for relay ISO is maintained closed through arm I4I.

When the sensing elements III sensed the transverse row of. perforations in tape II2 for the tabulation function appearing after the figures shift signal, contacts II3 were set accordingly and during the cycle of rotation of brush arm I2I impulses identified with the tabulation operation were transmitted over conductors I09 and I06 and were impressed upon the single selector magnet at each of the connected stations.

In response to the operation of the single selector magnet, the selecting mechanism for the printing telegraph receivers at the respective stations operates, and causes the setting of the vanes 32, whereupon the function bar 33 identified with the tabulator operation is operated to cause the pawl 45 to be moved free of the teeth on ratchet 39 so that the carriage I2 advances continuously until cam I4 engages a stop element 10 mounted on tabulator bar 65. When cam I4 engages a stop I0, tabulator bar 55 is moved in a clockwise direction, as viewed in Fig. 2, the pawl 45 is restored to the position shown in Fig. 2 or a position where member 5i lies in the path of tooth SI, 42, or 43. Arm 98 is moved to the solid line position shown in Fig. 3 and in moving to such position rotates bell crank lever 89 against the action of spring I04 when function bar 33 operates. Lever I03 remains in the position shown. against stop pin its due to the action of spring It'l. When tabulator bar 83 is moved by cam I I, arm 58 is restored to the dotted line position shown in Fig. 3 and in so moving, rctates bell crank 99 in a direction such that its lower arm engages pin I02 and rotates lever I03 against the action of spring I lI, whereupon contacts 530 are opened only momentarily to transmit a start signal and thus unshift all printers on the line circuit without printing a false character. Engagement of arm 98 with the upper arm of hell crank 99 is adjusted to provide for proper time and duration of opening of contacts I49 to produce the desired condition.

Upon the opening of contacts M3, I l-3, or I65, depending upon which contact is first operated, or depending upon the printer whose contact is adjusted to exercise control to open the line circuit and control the restarting or" transmission, current is removed from the lower windings of relay I38, and since the circuit for the upper windings thereof is opened at the uppermost bacl; contacts of relay I40, now energized, relay 238 is deenergized so that its spring M6, which has a lower tension than spring I 36, moves arm Ml free of its electrical contact, whereupon the holding circuit of relay I is opened. Relay N30 is thus deenergized to cause the energization of electromagnet 52?, which removes armature I25 from the path of arm I2I to allow such arm to rotate. Cam I3I is rotated, opening contacts I33 and 436. Opening of contact I33 opens the holding circuit of relay I20, whereas contact I34 in opening removes the ground connection from relay I40 which was deenergized upon the deenergization of relay I30. Relay H50 completes, through its upper back contacts, an energizing circuit for relay I38. The characteristics of relay I38 may not be such to cause the attraction of the armature, I31 of relay I38 upon the closure of the back contacts of relay I40 and consequently cam I32 is arranged shortly after its release with shaft I22 to move arm I35 downwardly and force armature I31 mechanically against its pole pieces independently of the circuit controlled by relay I40. However, with current flowing through the upper windings of relay I38, armature I3! will be held attracted.

Particularly significant with regard to the circuit arrangement previously described is the fact that the windings of relay I38 are not included in the line circuit during the transmission of code combinations of signaling impulses but are connected therein only upon the energization of relay I40, the energlzation of which occurs only when a tabulator signal follows im- ,mediately a figures shift signal in the tape. Should a tight tape condition develop immediately following the energization of relay I20, advancement of the tape will cease, but relay I20 remains energized. Upon resumption of tape advancement, the tabulator signal will be sensed and relay I30 will be energized to effect the desired control. Consequently, no additional impedance is included in the line circuit to alter or change the characteristics of the line. Also, by using a relay I38 having the same electrical characteristics as selector magnet 8, the operating conditions of the line circuit can be easily determined, for the use of a relay I38 is the same as if another receiving printer were added to the circuit.

While the invention has been disclosed and described with regard to a particular type of receiving printer, it is obvious that other forms and types of receiving printers might be utilized for the achievement of the present invention without departing from its scope and spirit.

What is claimed is:

1. In a telegraph system, a line circuit extending between a plurality of stations, a transmitter at one of said stations, a printing telegraph receiver at the other station responsive to impulses transmitted from said transmitter, said transmitter including a distributor and a record reader for sensing the control indlcia on a control strip, means for discontinuing transmission from said transmitter, means responsive to two successive predetermined groups of control indicla on said strip for operating said means to discontinue transmission from said transmitter, and means operated by said receiver for establishing a condition to resume transmission from said transmitter.

2. In a telegraph system, a line circuit extending between a plurality of stations, a transmitter at one of said stations, a printing telegraph receiver at the other station responsive to impulses transmitted from said transmitter, said transmitter including a distributor and a record reader for sensing the control indicia on a control strip, means for discontinuing transmission from said transmitter, means responsive to predetermined control indicla on said strip for operating said means to discontinue transmission, and means remote from said transmitter and local to the receiver at any of said stations for starting transmission upon the establishment of a predetermined condition in said line circuit.

3. In a telegraph system, a single line conductor extending between a plurality of stations, a transmitter at one of said stations, a printing telegraph receiver at each of the other stations responsive to impulses transmitted from said transmitter, said transmitter including a distributor and a record reader for sensing the control indicia on a control strip, means for discontinuing transmission from said transmitter,

amass-i means responsive to a predetermined condition in the record reader for operating said means to discontinue transmission, and. means included in a receiver at a station in said line circuit remote from said transmitter for establishing a condition whereupon said transmitter resumes the transmission 7 of impulses.

4. In a telegraph system, a line circuit extending between a plurality of stations, a transmitter at one of said stations, a printing telegraph receiver at each of the other stations responsive to impulses transmitted from said transmitter, said transmitter including a distributor and a record reader for sensing the control in'dicia on a control strip, means for discontinuing transmission from said transmitter,-means responsive to a predetermined group of control indicia on said strip for operating said means to discontinue transmission, means in each of said receivers responsive .to the establishment of a predetermined condition, and means in said transmitter responsive to the operation of said last mentioned means in any ofsaid receivers for restarting said transmitter.

5. In a telegraph system, a line circuit extending between a plurality of stations, a transmitter at one of said stations, a printing telegraph received at each of the, other {stations responsive to impulses transmitted byfsa'id, transg'mitten'isaid transmitter including'a; distributor and afrecord reader for sensing the; control indicia on a control strip, means for-f controlling transmissiondrom said transmitter", a pair of relays operated successively in response to two successive predetermined groups of control indicia on said strip for operating said means to discontinue transmission, and means controlled by one of said receivers for establishing a condition to resume transmission from said transmitter.

6. In a telegraph system, a line circuit extending between a plurality of stations, a transmitter at one of said stations, a printing telegraph receiver at each of the other stations responsive to impulses transmitted from said transmitter, said transmitter including a distributor and a record reader for sensing the control indicia on a control strip, means for controlling transmission from said transmitter, a pair of relays operated successively in response to two successive predetermined groups of control indicia on said strip for operating said means to discontinue transmission, and means responsive to a predetermined condition for causing the release of one of said relays to restart transmission from.

said distributor.

7. In a telegraph system, a line circuit extending between a plurality of stations, a transmitter at one of said stations, a printing tele graph receiver at each of the other stations responsive to impulses transmitted from said energization of one of said relays whereupon transmission from said transmitter is resumed.

8. In a telegraph system, a line circuit extending between a plurality of stations, a transmitter ment of said condition in said line circuit for resuming transmission from said transmitter.

9. In a telegraph system, a line circuit extending between a plurality of stations, a transmitter at each of said stations, a printing telegraph receiver at each. of the other stations responsive to impulses transmitted from said transmitter and including a tabulating mechanism, said transmitter including a start-stop distributor and a record reader for sensing perforations on a perforated tape, means for arresting the operation of said distributor to discontinue transmission of impulses over said line circuit, means operated by thetabulating mechanism of areceiver in response to the transmission of a group of impulses from said transmitter for opening the line circuit, and means included in said transnii'tter r'esponsive to the opening of said line circuit' atany of said stations for restarting said distributor for the resumption of transmission of impulses determined by the perforations in said tape.

10. In a telegraph system, a line circuit extend ing between a plurality of stations, a transmitter at one of said stations, a printing telegraph receiver at each of the other stations responsive to impulses transmitted from said ter and including a movable carriage and atabulating mechanism responsive to a predetermined group of impulses transmitted from said transmitter for causing the continuous advancement of said carriage, said transmitter including a distributor and a record reader for sensing the control indicia on a control strip, means for discontinuing transmission from said transmitter following the transmission of a group of impulses identified with the operation of the tabulating mechanism in the receiver whereby said carriage moves continuously, means operated when said carriage reaches a predetermined point, and means in the transmitter responsive to the oper ation of said last mentioned means or the receiver at any station for starting transmission from said transmitter.

ii. In a telegraph system, a line circuit on tending between a plurality of stations, a trans mitter at one of said stations, a printing tele graph receiver at each of the other stations responsive to impulses transmitted from said trans= Knitter, said transmitter including a distributor and a record reader-embodying means for sens= ing the control indicia on a control strip, two sets of elements controlled by said indicia sensing means, means for discontinuing transmission from said transmitter, and means controlled by a predetermined successive setting of one or the means controlled by said .indicia sensing means for operating said transmission" discontinuing means to discontinue transmission.

12. In a telegraph system, a line circuit on tending between a plurality of? stations, a transmitter at one or said stations, a receiver at tilt other station responsive to impulses transmitted by said transmitter, said transmitter including a distributor and a record reader for sensing the control indicia on a control strip, a slow-torelease relay responsive to a predetermined group of control indicia on said strip, and means controlled by said relay and operated, provided the next succeeding group of control indicia is of a predetermined character, for discontinuing transmission from said transmitter.

18. In a telegraph system, a line circuit extending between a plurality of stations, a transmitter at one of. said stations, a receiver at the other station responsive to impulses transmitted by said transmitter, said transmitter including a distributor and a record reader for sensing the control indicia on a control strip, a slow-to-- release relay responsive to a predetermined group of control indicia on said strip, means controlled by said relay, and operated, provided the next succeeding group of control indicia is of a predetermined character, for discontinuing transmission from said transmitter, means in the receiver responsive to a particular group of impulses from said transmitter, and means responsive to said last mentioned means for causing said transmitter to resume transmission of impulses in accordance with the control indicia on said strip.

14. In a telegraph system, a line circuit extending between a plurality oi stations, a transmitter at one of the stations, a printing telegraph receiver at the other station responsive to immitter including a distributor and a record reader ior sensing the control indicia on a control strip,

means for discontinuing transmission from said transmitter upon the establishment of a predetermined condition, means normally unresponsive to signals impressed on said line circuit, and means operated through the operation of said transmission discontinuing means for rendering said last mentioned means responsive to impulses impressed on the line circuit.

15. In a telegraph system, a line circuit extending between a plurality of stations, a transmitter at one of the stations, a printing telegraph receiver at the other station responsive to impulses transmitted by said transmitter, said transmitter including a distributor and a record reader for sensing the control indicia on a control strip, means for discontinuing transmission from said transmitter upon the establishment 01 a predetermined condition, means normally unresponsive to signals impressed on said line circuit, means operated through the operation of said transmission discontinuing means for rendering said last-mentioned means responsive to impulses impressed on the line circuit, and means in said receiver for impressing on the line circuit the impulses for operating the means normally unresponsive to signals whereby a condition is established for resuming transmission from said transmitter.

CHARLES W. BURCKY.

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