US1564421A

US1564421A - Printing telegraph

Info

Publication number: US1564421A
Application number: US432564A
Authority: US
Inventors: Edward E Kleinschmidt
Original assignee: MORKRUM KLEINSCHMIDT CORP
Current assignee: MORKRUM KLEINSCHMIDT CORP; MORKRUM-KLEINSCHMIDT Corp
Priority date: 1920-12-22
Filing date: 1920-12-22
Publication date: 1925-12-08
Anticipated expiration: 1942-12-08

Description

Dec. 8, 1925- E. E. KLElNSCHMlDT PRINTING TELEGRAPH Il Sheets-Sheet l Filed Dec. 22, 1920 "HIM N TOR TTURNEYS Dec. 8, 1925 E. E. KLElNscHMlDT PRINTING TELEGRAPH Filed DSG? 22, 1920 '7 SheebS--Sheet` 2 INVENTOR.

' YMATTORNEYS Dec. 8, 1925- E. E, KLEINSCHMIDT PRINTING TELEGRAPH Filed Dese 22, 1920 'Z Sheets-Sheet y5 A TTORNEYS Dec. 8, 1925- 1,564,421

E. E. KLElNscHMlD'r PRINTING TELEGRAPH Filed De@1 22, l1920 7 Sheets-Sheet' 6 d ff if ad G0 O OO jf O o ooooooooooooooooo OOO OOO OO o o ooooooooooooooo oo' 0 O O OO O OG O OO l f f/ ff W 'Y INVENTOR,

Y n A TTORNEYS Dec. 8, 1925- E. E. KLEINSCHMIDT PRINTING TELEGRAPH Filed Deo. 22, 1920 7 Sheets-Sheet 7 f i INVENTOR.

Y A TTORNEYS Patented Dec. 8, 1925.

uni/ran STATES PATENT OFFICE.

EDWARD E. KLEINSCHMIDT, OF BROOKLYN, NEW YORK, ASSIG'NOR, BY MESNE AS- SIGNMENTS, TO MORKRUMKLEINSCEMIDT CORPORATION, OF CHICAGO, ILLINOIS,

A CORPORATION F DELAWARE.

PRINTING TELEG'RAPH.

. Application filed December 22, 1920. Serial No. 432,564.

To all whom t may concer/n.:

Be it known that EDWARD E. KLEIN- SCHMIDT, a citizen of the United States, re-

siding in New York, borough of Brooklyn,-

in the county of Kings and'State of New York, have invented certain new and useful Improvements in Printing Telegraphs, of which the following is a specification.

One of the objects of my invention is the provision of mechanism, particularly applicable to the Baudot or like systems, in which the usual distributer is dispensed with, and in which line impulses are timed by a rotating member'coactoing with mechanical means such as movable members, thus eliminating the usual distributer brushes and doing away with one of the sources of trouble and ex.- pense in a system of this character.

My invention also hasfor one of its obll jects the provision of a receiving device, in which the printing mechanism is controlled by a rotatable member through mechanical means, and which thusdoes away at the receiving station with the usual distributer.l

lathe. usual Baudot system, the letters or characters are received over the line by means of live group impulses; a sixth impulse is used for'the purpose of stopping the distributer at the receiving station to 3@ bring the same into synchronism with the distributer at the transmitting station, andv still another impulse is used to start the distributer at the receiving station. In accordancewith my invention. the rotatable member at the receiving station is stopped intermittently in response to one of the group impulses, usually the last impulse, and is started by a single additional impulse having a characteristic different from that of the immediately preceding impulse. In accordance with my invention, therefore, the same amount of information is sent over the line by means of a less number of impulses, which means that the speed of receiving is thereby. increased, or that the same speed may; be maintained with greater certainty and accuracy. Still another object of my invention is the provision of la novel signaling mechanism coacting with the message transmitting mechanism.

Other objects` of my invention will appear in the specification and will be particularly pointed out in the claims.

My invention will be best understood by reference to the accompanying drawings in which I have illustrated the preferred embodiment of my invention, and in which Fig. 1 is a side elevation, partially in section, illustrating the preferred form of the transmitting mechanism embodied in my invention and showing the cover plate removed to show the working parts: Fig. 2 illustrates the driving mechanism and the associated parts of the transmitter, as viewed from the opposite side plate on whichthe same is mounted; Fig. 3 is a plan view illustrating particularly the receiving mechanism; Fig. 4 is a side elevation, partially in section and partially broken away, and taken from the opposite side of the device from which Fig. 1 is taken; Fig. 5 is a sectional plan view of parts of the transmitting mechanism;Fig. 6 is a fragmentary perspective view of a partof the transmitting mechanism; Fig. 7 is a sectional elevation of the receiving mechanism taken along line 7 7 of Fig. 8; Fig. 7a is an end view and Fig. 7b a perspective view of the structure shown in 7; Fig. 8 is a det-ail view illustrating the escapement mechanism of the receiver; Fig. 9 is a detail view illustrating the escapement in a different position from that shown in Fig 8; Fig. 10 is a perspective view of the notched discs with which the rotating member at the receiver is provided, and the cooperating levers controlling certain contacts: Fig. 11 is an end elevation of Fig. 10; Fig. 12 is a plan view of the grooved drum and feed wheel beneath which the tape passes, and of the associated parts; Fig. 13 is a sectional side elevation of the discs and associated parts by which the signalling mechanism and the transmitting mechanism are interlocked; Fig. 14 isA a detail view of the mechanical means for operating the signal bell at the transmitting station. and Fig. 15 is a diagram of the electrical connections.

Like reference characters indicate like parts throughout the drawings.

Referring now to the drawings, and first of the y to the diagram in Fig. 15, 10 is a contact arm at the transmitting station, indicated, in general, at A, the contact vibrating between two stationary contact points 11 and 12 connected to o posite sides of a battery 13, the middle po1nt of which is grounded, as at 14. The vibrating contact arm 10 1s.

connected to the line conductor 15, which includes at the receiving station, in the form here illust-rated, a polarized relay 16, the line being grounded at the receiving station, as at 14, the 'receiving station being indicated, in general, by the character B. ln the Baudot'system, each letter or character 1s usually sent by means of a. group of live impulses having different polarities to .produce the desired combinations. l have illustrated at 17, 18, 19, 20 and 21, the usual selector magnets, as well as the sixth impulse magnet 22, which initiates the printing. rlhese magnets are all included in a local circuit 23, comprising a source of electric energy, such as a battery 24. The respective circuits of the

mao'nets

17, 18, 19, 20, 21 and 22 are controlled by sets of

contacts

25, 25, 26, 26a, 27, 27, 28, 28a, 29, 29u and 30, 30, respectively.

Referring now to Figs. 1, 2 and 4, 31 indicates, in general, the frame of the machine comprising a bed plate 32, on which is mounted the operating motor 33, a base' plate 34 being secured to-the bed plate 32 and `carrying the upright plate 34, on which most of the parts of the transmitting mechanism have their bearings. The vibrating arm 10, referred to in connection with F ig. 15, is mounted on an elbow lever 35, pivoted at 36 in a bracket 37, mounted en the oase plate 34. A spring 39 is connected to the lever 35 andV to a stationary part of the device and tends to move the arm 10 against the contact point 12 which, in the specific embodiment of my invention here shown, is the negative Contact, contact point 11 being the ostive contact. Beneath the lever 35 is isposed a plurality of arms indicated, in general, at 40, (see Figs. 1 and 5) and which are individually represented by the reference characters 40a, 40", 40C, 40d, 40e and 40'?. The horizontal portion of the elbow lever 35 extends across all siX of the arms, so that the elevation of any one of the arms will rock the elbow lever 35 and move the contact arm 10 against the contact at the right, as viewed in Fig. 1. A spring 41 is provided for each of the arms 40, one end of the spring being attached to the upper sideI of the arm, and the other end to a stationary part, so that the. spring tends to elevate the arms against the action of the spring 39, and the springs 41 are suliiciently powerful to overcome the springs 39 and move the arms when the latter are unrestrained. To each of the

arms

40, 40", 40, 40d and 40e are pivoted, when used in the Baudot system, live upwardly extending plungers 43, the upper ends of which are preferably cylindrical and pass through slots 44 in a plate 45, secured to the upright plate 34B, the upper ends of the plungers cooperating with a perforated tape, in a well understood manner. An additional guide late 47 is preferably secured to the underside of the plate 45 and is provided with slots 48, through which the live plungcrs also pass. The plungers 43 are moved to the right, as viewed in Fig. 1, by springs 49 which bring the plungers into engagementwith set screws or other stops, by means of which the positions of the plungers may be adjusted. No plunger is connected to the sixth arm Zlf which is actuated by its spring 41/each time the arm is released, in the manner hereinafter described.

rllhe tape 51 has a message perforated thereon, by means of a separate instrument of any suitable character. The tape passes beneath a roll 52, provided with peripheral grooves 53 (Fig. 12) which register with the upper cylindrical ends of the plungers 43, so that when a perforation in the tape comes above the plunger, v the plunger passes through the perforation into the registering groove 53. The perforationsg54, Eig. 12, produce the group of live impulses of the Baudot code, and 55 are a series of feed holes which are engaged by teeth 56 on the roll 52. rlhe roll 52 is rotatably mounted on a pintle 57 which passes through an arcuate slot 58 in the plate 34a and is secured to one arm of a bell-crank 59, pivoted at 60,

the other arm of the bell-crank being provided with an operating handle 61, passing through an arcuateslot 62 in the plate 34a. A guide plate 63 for the tape is mounted on the plate 45 in front of the roll 52, a post 64 preferably being provided to keep the tape in the groove 63, formed in the guide plate. A. stripping plate 65, secured to the plate 34a, preferably extends across and above. the tape to disengage the latter from the feed wheel.

Levers, indicated, in general, at 66, and individually by the reference characters 66a, 66h, 66C, 66d, 66e and 66f, are pivoted at 6i and engage the free ends of the arms 40a, 40", 40, 401,40e and 40f,'respectively. rlhe opposite ends of the levers 66 are provided with projections 68 which are engaged by cams69, secured to Aand langularly displaced with reference to. each other on a shaft 70,

having its bearings at 70a in the frame of the` machine (see Fig. 5), so that the cams successively engage the endsof the operating levers 66, 66", 66, 66d, 6.6e and 66f. Each cam arm is preferably extended to the diametrically opposite sidesof-the shaft, so that each of the arms 66 is twice operated during each revolution ofthe shaft 70 on which the cams are mounted.

The connections by which the operating cams, just'referred to, are actuated by the motor include the shaft 71 of the motor which has its bearings at 71a in brackets se cured to the frame. On this shaft is mounted a worm 72 (see Fig. 4) engaging a worm wheel 73 rotatably mounted on the shaft 70, suitable ball-bearings 74 preferably being interposed between the worin wheel 73 and the shaft. A slip friction, indicated, in general, at 75, is interposed between the worm wheel 73 and the shaft 70, so that the motor may continue to rotate while the transmit ting device is inactive. A friction plate 76 engages the face of the worm wheel 73 and is attached to, or integral with, a hub 77 surrounding the shaft 70. A.v collar 7S mounted adjacent to the hub 77 and is provided with lugs 79, engaging in correspondu ing recesses in the hub 77, so that the two parts rotate together. The end of the collar 78 is preferably enlarged, as at 80, and secured to the shaft by a set screw 81, a coiled spring 82 being interposed between the enlarged end of the collar and the friction plate 76, to produce the desired friction between the plate and the gear.

The roll 52 is driven by means of a pinion 85, secured on the shaft 70 acting through

gears

86, 87 and 88, i(see Figs. 1, 2 and 5), the latter being secured to rotate with the roll 52, it being understood that the gear wheel 88 rotates when the roll 52 is elevated by the handle 61. The elbow lever 59, on

" which the roll 52 is mounted, is normally held in the position, shown in Figs. 1 and 2, by a spring 89, (see Fig. 2), attached to an arm 90, secured on the rock shaft on which the elbow lever 59 is mounted, an adjustable set a rew 91 preferably being attached to the elbow lever and engaging a stop, such as a screw 92 (see Fig. 2). The elbow lever 59, when moved clockwise, as viewed in Fig. 2. is held in position by a friction spring 93, secured on one side of the vertical plate 34.

ln the embodiment of the invention here illustrated, the different characteristicsl o-f the impulses are produced by varying the polarity o-f the group impulses, and an additional impulse is provided having a different polarity from that of the fifth or last group impulse. `That plunger 43 which is pivoted to the arm 40, producing the last of the group impulses, is provided with a in 94 which engages an arm 95, secured on a shaft 96, (see Fig. 6), when this particular plunger `is elevated. The rock shaft 96 is held in one or the other of its positions by a spring finger 97, Fig. 1, the bent end of the spring engaging onone side or the other of a triangular lug 97 1. A downwardlv extending arm 99 is also secured to the shaft 96 and is provided at its lowerl end with a horizontal extension 100, which is ,shaft 96 and brings extension 100 on thi` lower end of the arm 99 over the hook 101, so that when the last cam arm 69 engages the corresponding lever 66t and releases the corresponding arm 40, the latter cannot be elevated because of the lock engagement, and the contact 10 is locked against the contact 12, so that 'a negative impulse is sent.

having a polarity diverse from that of the last of the group impulses. Vhen, on the other hand, the last group impulse is a negative impulse, the plunger 43, corresponding to the last group impulse, is not raised, the pin 94 docs not engage the arm 95 to rock the shaft, and the extension 100 doesk not come into engagement with the hook 101. so that when the lever 66t is rocked by the corresponding cam arm, the corresponding arm 40f is elevated, contact arm 10 is brought into engagement with contact 11, and a. positive impulse is sent over the line. It will be seen, therefore, that the additional sixth impulse always has a polarity the rcverse of the last group impulse. A. second arm 102 is secured to the shaft 96- and -is engaged by a lug 103, on one of the lever arms 66, here shown as the second lever arm the arm 102, rocks the shaft 96 and causes the arm to be depressed, thereby returning the extension to its normal position.

' The signaling mechanism comprises a code wheel 104, secured on a shaft 105, having` its bearings at 106 in the plate 34a, and in a bracket secured to the bed plate, respectively. On the end of the shaft 105, opposite to the cam wheel, is secured a gear wheel 107. meshing with a gear 108, formed on a collar 109, secured on a hub 110, surrounding the shaft 7 0 the hub preferably being integral with a friction disc 111, engaging the gear wheel 7 3 on the opposite face from the friction disc 76, the parts, associated with the collar 109, engaging a collar 112. secured to the shaft, so that the friction disc 111 is held in engagement with the face of the gear wheel by the same spring 82 which holds the friction disc 76 in engagement with the same gear wheel. It will thus be seen that the transmitting mechanism and the signaling mechanism are both geared to the same motor, and interlocking mechanism is provided. which stops the movement of the transmit ting mechanism, when the signaling mechanism is put into operation, and vice versa.. A spring arm 113 (see Fig. 2)' is provided at its upper end with an operating handle 114, passing through a slot 115 in the plate asY . 66", which, when the lever is elevated, engages l llo 34a. The spring arm 113 is secured at its 130* lower end on a shaft 116, having its bearings at 117 in plates 34a and 34", secured to the base plate; Secured on shaft 116 is another arm 118 (see Fig. 13), to the upper end of which is secured a' roller 119 (see Fig. 13) and laterally extending projections 120 and 120a (see Fig. 5), forming detents, the roller and the detente cooperating with discs 121 and 122, secured on

shafts

70 and 105, respectively. The disc 121 is provided, on diametrically opposite sides, with notches 121a which cooperate with roller 119, while disc 122 is provided with a single notch, 122a within which detent 120 is received. Discs 121 and 122,together with the notches and the cooperating roller and detent, are so arranged that, when the roller is received in one of notches 121B, detent 120 is withdrawn from notch 12231 in disc 122, and detent 120a is simultaneously brought into the path of movement of an arm 138, secured toacollar h-, which is, inturn, secured to shaft 70, thereby arresting the transmitting mechanism. On the other hand,V when notch 122a in disc 122 is presented to.

detent 120, the detent is drawn into the notch by a spring 11821, attached to arm 118, which normally maintains the detent in position. `When the operator desires to send a signal over the line, he throws the handle 114 to the right, as viewed in Fig. 1. rlhis movement of theI handle fleXes spring arm 113 and tends to rock shaft 116 clockwise, and as soon as one of the notches 121a in disc 121 is brought opposite roller 119, and at the same time arm 962L is out of the way of arm 1162*, the roller will be moved to the right, as viewed in Fig. 13, and the move.- ment of the transmitting mechanism lwill thereby 'be stopped. The signaling mechanism, which has hitherto been inactive, because of the friction disc 11, slipping on the gear wheel 73, now begins to operate and code wheel '104 .transmits a-desired signal over the line. This is done by operating the same contacts that are used during transmission, cam wheel 104 engaging one arm of a bell-crank 123, pivoted at 1233, which is kept in engagnentrwith the. code wheel by a tension spring 124, the opposite arm of bell-crank 123 engaging the end on one of the levers 66, here shown as the sixth im ulse lever 66f. Code wheel 104 is provi ed with any desired number of teeth 104, suitably formed, and a complete revolution of the code wheel produces a desired signal at the receiving station. In actuating the signaling mechanism with the code wheel illustrated, a plurality of impulses forming signals, the precise nature of which it is unnecessary to describe, are sent over the line. When the code wheel cam is started from the position shown in Fig. 1, arm 123 is brought into engagement with the first tooth 104b and a starting or sixth impulse is sent over the line. lt is necessary for theopera` i mechanism-in thiscase a negative impulse.

Mechanical interlocking means are, therefore,

provided which permit the signal mechanism` to start only when the last group impulse is a negative impulse. An arm 96a is secured to shaft 96, which coacts with an arm 116l attached to shaft 116, to which spring arm 113 is secured, and the parts are so arranged that when the last group impulse is negative, the arm 96n engages the arm 116% thereby 4preventing the rotationof the shaft 116, necessary to the starting of the signaling mechanism, andthe transmitting mechanism will continue to operate until the last group impulse is negative. In the embodiment here illustrated, three different. signals which may be.carriage shift, the letter J, and carriage release, are sent by the code wheel. It may meI remarked, however, that the successive starting impulses of the code wheel are of different characteristics from those of the immediatelylpreceding group impulses, the same as in the transmitting mechanism, and at the end of a given signal, the cam on the arm 123 drops off from the cam 104a, on the wheel immediately below the cam on the arm 123, Fig. 1, and sends a negative starting impulse, which starts the receiver. rl`he extended notch in which the cam on the arm 123 is shown positioned in Fig. 1, permits the. continued rotation of the code wheel 104, after the cam has dropped into its notch, and this permits the movement of the receiver to be arrested, before the transmitting mechanism begins operation. The signal at the receiving station may be a single stroke of a bell which is likewise produced at the transmitting station by a mechanical arrangement, reference being had particularly to Figs. 5 and 14. The bell is indicated at 125. A bell-crank 126 pivoted at 127 is provided with one arm 1262*, adjacent to the gear wheel 107. Thex other arm 126b is normally held against a stop 128 by a spring 129. The free end of the arm 126*j is provided with a hammer 126?. A lug 107Ct is secured on the face of the gear wheel 107 which engages the arm 126a from belowand `rocks the bell-crank, and when the lug 107` is disengaged from the arm 126g, the bell-crank is returned to its normal position by spring 129 with'suiiicient force to cause the hammer 126c to enlOO gagethe bell and give the operator an audible indication that the signaling member has completed one revolution and that a cor-.

responding signal has been given at the rcceiving station. The operator will hold the handle 114 in the position at the right, as viewed in Fig. 6, until the desired nuiiibe of signals have been transmitted and when released, the rock shaft 116, to which the spring arm is secured, is returned to its normal position by a spring 118, (see Fig. 13), when the notch 121n in the disc 121 is brought opposite the detent 120.

' having at its upper end a lateral projection 134, to which is attached the upper end of an over-centering springy 135, the lower end of which is attached to an arm 136, pivoted at its upper end 137, so that, when the lower end of the arm is moved to the right, as viewed in Fig. 2, it comes in the path of movement of the arm 138, secured on the shaft of the transmitting mechanism, to stop the operation thereof. vWhen the arm 131 is raised, by the slack being taken up in the tape, the upper end of the arm 133 is moved tothe right, which moves the fspring 135 past the center of the pivot 137 of the arm 136 and causes the lower end of the arm to snap to the right .into the path of movement ofthe arm 138 on the shaft 70, and thereby stops the operation of the transinittin-g mechanism. Then there is again sufficient slack in the tape, the arm 131 drops and moves the arm 133 out of engagement with the arm 138.

In Figs. 3 and 4, a centrifugal arrangement is shown for producing substantially constant rotation of the motor. A fly-Wheel 139 is secured on4 the shaft 71 and is provided at one side with a recess 140, in which is suitably mounted a strap spring 141, to which'is secured, beyond the center, weights 142 which preferably pass through openings 142a in the iiy-wheel. Any movement above normal of the fly-Wheel causes the Weights 142 to flex the spring 141 to .such an extent, as to withdraw a thrust bearing'143, cai'- ried by the spring, from engagement with an arm 144, pivoted at 145. The outer end of the arm 144 carries a contact 146 which nor- Inally engages a contact 147, the contacts being included in the armature circuit of the motor. When the speed of the motor increases beyond normal, and correspondingly that ofthe fly-wheel, the contacts are opened, introducing resistance in series with the armature, and thereby reducing the I speed of the motor.

In the receiving mechanism which c0opcrates with the transmitting mechanism, worm 72 on shaft 7l is engaged by a second worm wheel 148, (see Fig. 4), secured on a vertical shaft 149, having its bearings at 150 and 151 in the bed plate and in a plate 152, secured, by means of posts 153, to the bed plate. On shaft A149 is secured a rotating member, indicated in general, at 154,. and comprising discs 154, 154'), 154C, 154, 154e and 154 Each disc is provided, on diametrically opposite sides, with notches 155, Figs. 11 and 15, and as will be apparent from an inspection of the disc 154f, shown inFig. 10, the notches in the successive discs being angularly displaced, withreference to each other.

- Rotating member 154 is rotated at a speed very slightly in excess of that of cams 69 at the transmitting station, and is stopped and started twice at each revolution, to keep the same in synchronism with the rotating member at the transmitting station. A magnet 156, (see Fig. 15), is included in the local circuit 23 of the receiving station. One terminal of this magnet is connected to one pole of local battery 24, while the opposite terminal of the magnet is connected to the opposite pole of the batterY through armature 16a of the polarized relay. Magnet 156, therefore, isfenergized in response to each positive impulse and is not energized when a negative impulse comes over the, line. Now, in order that selector magnets 17, 18, 19, '2O and 21 may be energized in response to certain impulses, here shown as the positive impulse, and in order that the magnets may not be energized in response to the impulse of opposite polarity, means are provided whereby the line circuits, including the respective selectcnl magnets, are closed in response to positive line impulses, but prevent the circuits, including the selector magnets, from being closed, in response to negative line impulses. Arms' 157 are pivoted at 158 and are formed at theirends with lugs 159 which register with discs 154 and are adapted to be received in notches 155 thereof, and thereby permit the arms to drop, provided they are otherwise free. The arms in their normally raised positions engage the respective contact springs 25, 26, 27, 28, 29 and 30 and hold them out of engagement with their cooperating contact points. The magnet 156 is provided with an armature 160, mounted on an arm 161, pivoted'at 162, the free end of arin 161 being provided with a. universal bar l163, Fig 7, which is lnormally disposed opposite lugs 164, formed on the o ne side of the five arms 157 controlling sprin 25 .to 29, inclusive, when armature 160 is in its normally retracted position, as shown in Figs. 3 and 15, arm 161 being held against that a local impulse operates the sixth pulse magnetafter each code combination has been set up on magnets 17 to 21. Vith the parts in the position shown in Fig. 3 and the universal bar 163 directly opposite lugs 164, the lugs engage the universal bar and arms 157 cannot drop into notches 155, under pressure of contact springs 25 to 29. Now, when a positive impulse comes over the line, armature 16, Fig. 15, is closed against the front contaft, the circuit, including magnet 156, is thereby closed and the magnet energized, thereby attracting armature 160 and withdrawing universal bar 163 from lugs 164,

including that lever whose lug 159 will come opposite the notch 155, at the time corres onding to the assumed positive impulse.

ne arm 157Uwill thereby drop, closing corresponding contacts 25, 25a to the corresponding selector magnet. When, however, a negative impulse comes over the line, magnet 156 is not energized, armature 160 remains in its retracted position, thus leaving universal bar 163 opposite lugs 164, and when a notch 155 in a cooperating disc 154 comes opposite a lug 159, the corresponding lever 157 cannot drop into the notch, with the consequence that'the corresponding contacts remain open-and the corresponding selector magnet is not energized. It will be seen, therefore, that the selector mechanism is under the oint control of the line impulses and the rotatable member at the receiving station.

The means for stopping and starting the rotating member of the receiving device during each revolution, and thereby keeping the same in cyclic synchronism with the movement of the rotating member at the transmitter, comprise an escapement, including two diametricaily opposite arms 167, Fig 7, secured-to the face of one .of the rotatingdiscs 154 and each carrying at its end a detent 168 pivoted at 168a and cooperatin with two arms 169 and 17 0, pivoted at 171, ig. 8, and biased to move towards each other by springs 172, connected to extensions 173, at` the ends of the arms. An arm'174 is secured to member 161 which is actuated by armature 160 and extendsy between

arms

169 and 170. When the armature is retracted, arm 174 will engage arm 176 and move it in one direction, and when the armature is attracted by its magnet, arm 174 will engage arm 169 and move it in the opposite direction. lThe detent 168 is constructed and arranged to engage the ends of one or the other of

arms

169 or 170, and when it so engages either arm, the detent is tilted about pivot 168% so as to be freed from the other arm. In Fig. 8, detent 168 is engaged by the side extension of arm 169, and thereby tilted up, so as to clear the face extension of arm 170, while in Fig. 9, it is engaged by the face extension of arm 17 0, and thereby tilted down, so as to glide along the side extension of arm 169. The last impulse of the group impulses coming over the line, whether it be positive or negative, causes detent 168 to engage one or the other of arms 169. or 170, depending upon whether this last impulse is positive or negative. Now, when the, additional impulse having a polarity the opposite' to that of the last group impulse, comes over l the line, arm 174 will move the other arm to release the detent` so that the rotating member of the receiving deviceis always stopped by the last group impulse and is started in response to the additional impulse.

A friction device, indicated, in general, at 175, is provided for the rotating member of the receiving device, and as this vfriction member is similar to that already described in connection with the transm tting device, the same need not be described in detail.

The operation of the described printing telegraph is as follows: Assume that the operator desires to send the letter a. In the Baudot code, this letter is formed by two positive impulses, followed by three negative impulses. As the tape passes-through the transm'tter, perforations, forming the letter a transversely of the tape, will be made up of two perforations in the first two spaces, followed by three blanks. When cams 69, therefore, successively engage the ends of the first two levers 66, 66", the opposite ends of these levers willl be elevated, thereby permitting springs 41 to lift successively the first two arms 40a and 40h, as the upper ends of plunger-s 43 pass through the first two perforations of the tape. movement of arms 4()a and 4Gb will successively move contact tongue 10 into engagement with contact point 11, thereby sending two Successive pos'tive impulses over the line. The two positive impulses, passing over the line, will bring the armature 16a of relay 16 into engagement with its contact points at the times when

notches

155 and 155 of discs 154a and 154'J are opposite lugs 159 on levers 157, thereby permitting levers 157 to drop into the notches, since magnet 156 has withdrawn universal bar 163 from lugs- 164 on the levers 157. rlhe tivo sets of

contacts

25, 25a, 26, 26a are, therefore, successively closed, and selector magnets 17 and 18 are successively energized. 'When the three next operating lever-s 66, 66d and 66 are actuated by the three succeeding cam arms 69, the opposite ends are lifted from corresponding arms 40, 40d and 40e, but the latter are not permitted to rise, since their up- The l per ends are in engagement with the tape, the three last spaces corresponding to the group of impulses, being blanks. Contact tongue l0, therefore, remains in engagement with contact point 12, so that, in eHec't, three negative impulses are sent over the line. During this period of operation of the transmitter, the armature 16*1 of polarized relay 16 is moved aWay from its contact point with the result that as notches 155C, 155d and 155e of discs 154, 154d` and 154e come opposite lugs 159, the latter are not permitted to drop in the notches, since magnet 156 which is ,controlled lby armature 16a is not energized, universal bar 163 remains opposite lugs 164 of the last cthree levers 157 and

contacts

27, 27, 28, 28a and 29, 29a remain open, ivith the result that the three

selector magnets

19, 20 and 21 remain deenergized, thereby setting up the de sired combination in t-he printer. the last impulse of the group of five impulses is positive or negative, the movement of armature-160 in one direction or the other, will move onc or the other of. arms 169 or -170 and thereby stop the movement of the rotating member of the receiver, as heretofore explained. Now, when the additional sixth impulse, which is of opposite polarity to that of the last of the group impulses, comes over the line, armature 160 is moved in the opposite direction, the

other arm

169 or 170 is moved in the opposite direction from the preceding arm and detent 168 is released, hereby starting the rotating member of th receiver in synchronism with the rotating member of the transmitter.

Incase the operator desires to transmit a signal to anotherstation, he moves operating handle 114 to the right and holds it in this position until one of the notches 121a in disc 121 comes opposite roller 119 when the latter Will engage the notch, there-- by freeing disc 122, thus stopping the movement of the transmitting mechanism and starting the movement of the signaling mechanism. The cams 1042L on the code Wheel 104 are formed-to sen'd through the levers 123, 66f and 40f, the contact tongue 10, and contact points 11 andt12 the desired signal to the receiving station. When the code Wheel of the signaling mechanism has completed its movement, a signal, such as the ringing of a bell, is given at the receiving station and a corresponding signal, given at the .transmitting station through lug 1075, engaging arm 126% as heretofore described. The operator continues to hold handle 114 to the Oright until the desired number of signals, conveying the desired information, have been given. Since the signaling mechanism is driven by the same motor that drives the transmittni'g mechanism, it will be apparent that signals are Whether sent Without loss of time, and since they are transmitted through the same mechanismv by which the regular transmitter operates,

the signals will be lven vwith the same certainty as that of t e message sent by kthe transmitter.

What I claim and desire to secure byLetv means operating in response to a line impulse of one characteristic to restrain said members and 1n response to a line impulse of a different characteristic to permit movement of said members, said selector comprising 'electro-magnetic devices and contacts controlled by said membersand, in turn, controlling said electro-magnetic devices.

2. A start-stop telegraph system embodying a tape perforator, a transmitting apparatus into which said tape is fed from said tape` perforator, comprising means controlled by the perforated combinations in said tape to transmit code combinations of selecting impulses, and means independent of control by the perforated combinations for preceding each code combination of selecting impulses with a receiver start condition; a receiving distributor started into a cycle of operation by saidr start condition and arrested in operation at the end of a complete cycle, and control means interposed between said perforator and said transmitter controlled by the tension of said tape for arresting the operation of said transmitting apparatus only between the transmission of completed code combinations of selecting impulses and in a position to transmit a continued receiver stop condition in a manner to maintain said receivingl distributor at rest until said tape controlled means again initiates operation of said transmitting -apparatus; said start condition being always different in character from said stop condition.

3. The system as set forth in claim 2- in which said stop condition is the same in character as the last selecting impulse of a code combination of selecting impulses.

4.-. A system of telegraphy comprising transmitting means operating continuously and at a. uniform rate to transmit 'code combinations of electrical selecting conditions each preceded by a receiver start condition l differing in character from the last selecting condition entering into the preceding code combination; and a receiver stopped in operation at, the end of each code combination and started into operation by said receiver start condition preceding the reception of each code combination.

The system as set forth in claim 4 in whlch said transmlttmg means comprlses a continuously operating tape transmitter.

, member ycontrolling said selector members, a

' acter from the last condition of the preced-p selector magnet, an armature for said selector magnet vmechanically controlling said selector members` and a mechanical stop member Iorl said rotary member actuated by said armature to release said rotary member for rotation in response to cach start condition.

7. In telegraplrsysten'i comprising apparatus for transmitting code combinations of marking and spacing conditions with a start condition preceding each code combination;

said start condition being diii'erent in char- I ing code combination; a receiver comprising a plurality of selector members, a rotary member permlttlng successlve operation of said selector members, a magnet, an armature for -sald magnet adapted to interfere tary member actuated by said magnet in response to each start condition.

8. The combination as set forth in claim T in which said selector members comprise a plurality of switches, together With a set of selector magnets controlled by said switches.

9. Selecting receiving apparatus responsive to code combinations of selecting conditions, and starting into operation at the beginning of each code combination by a start condition differing in character from the last selecting condition of the preceding code combinati on comprising y,a rotary member, a magnet responsive to all of said condltlons, and a plurality of stops for sald rotary mem- 'ber actuated by said magnet.

EDWARD E. KLEIN SCHMIDT.