US1931672A - Signaling system and apparatus therefor - Google Patents

Description

0 611. 24, 1933. MQRTON r AL 1,931,672

SIGNALING SYSTEM AND APPARATUS THEREFOR Or iginal Filed July 11, 1930 4 Sheets-Sheet 1 INVENTOR5 STEEL/N6 MORTON HOWARD L. KEUM EDWARD E. KLEINSCHM/DT BY M ATTORN S. MORTON ET AL SIGNALING SYSTEM AND APPARATUS THEREFOR 4 Sheets-Sheet 2 Original Filed July 11 1930 INVENTORS smeu/vs MOETO/V Hon 4E0 1.. Mel/M EDW/IED E. MLE/MCHM/DT BY ,v MATTORN Oct. 24, 1933.

S. MORTON ET AL SIGNALING SYSTEM AND APPARATUS THEREFOR Original Filed July 11, 1930 4 Sheets-Sheet 5 FEDS INVENTORS STERLING moero/v HowAeD L maum EDWAED E. KLEl/VSCHM/DT BY 2 D MATTOR Y v 45 0 NH Oct. 24, 1933. s. MORTON r AL 1,931,672

SIGNALING SYSTEM AND APPARATUS THEREFOR Original Filed July 11, 1930 4 Sheets-Sheet 4 INVENTORSI STE)L/N6 MOETON HOW PD L. KEUM EDWARD E. KLE/NSC/lM/DT 'ATTO Y Patented Oct. 24, 1933 UNITED STATES SIGNALING SYSTEM AND APPARATUS THEREFOR Sterling Morton, Chicago, Howard L. Krum, Kenilworth, and Edward E. Kleinschmidt, Highland Park, Ill., assignors to Teletype Corporation, Chicago, Ill.,

ware

a corporation of Dela- Original application July 11, 1930, Serial No. 467,352. Divided and this application May 31, 1932. Serial No. 614,365

24 Claims.

This invention pertains to signaling systems and apparatus therefor, and more particularly to selective signaling systems and apparatus for printing telegraph operation.

The present application is a division of application Serial No. 467,352, filed July 11, 1930, which eventuated into United States Patent No. 1,904,- 164, dated April 18, 1933, and relates particularly to mechanical motor control devices for selectively controlled recorders. This invention is especially applicable to communicating systems comprising a plurality of stations having recording apparatus in which each apparatus or device is provided with an independent operating ormotor circuit, and in which it is desirable to control the operation of such circuits from a station or ofiice in order to avoid having to run the motors unnecessarily when the apparatus is idle. It is particularly economical and advantageous in those instances where recorders are employed interdepartmentally, in which event the motors need run only when messages are being interchanged, thus resulting in a maximum of service at a minimum of expense.

The primary object of the present invention is to provide a motor controlling device which is operatively associated with the selective apparatus of a receiving printer.

Another object of this invention is to provide a safety means which is located in the fnotor supply circuit and which is effective to insure stopping the motor with the recording mechanism invariably in a predetermined position and to condition the motor for starting upon the interruption of the signaling circuit.

A better understanding of the invention may be had from the following description, taken with the accompanying drawings, wherein:

Fig. 1 is a front elevational view of acombination transmitting and printing apparatus embodying the present invention.

Fig. 2 is a left side elevational view of the apparatus shown in Fig. l with parts broken away.

Fig. 3 is a transverse sectional view illustrating the relation between the selector mechanism and the function levers, and shows in addition thereto the relation of the mechanical selector to the motor control mechanism.

Fig. 4 is a perspective view of the switching or break mechanism.

Fig. 5 is a fragmentary perspective View of the motor control mechanism with certain parts broken away for clarity.

Fig. 6 is a side elevational view of the selector mechanism.

springs.

(Cl. fill-4.1)

Fig. 7 is a sectional i/iew on line 7-7 of Fig. 6 and shows a plan view of the armature lever locking device.

Fig. 8 is a fragmentary side elevational View with eliminated parts in dotted lines showing details of the orientation mechanism and starting mechanism of the selector shown in Fig. 6.

Fig. 9 is a detail sectional view taken approximately on line 9--9.;of Fig. 8 and shows the starting members of th selector illustrated in Fig. 6.

Fig. 10 is a detail side elevational view of the latching mechanism of the motor stop device comprising the present invention.

Fig. 11 is a detail plan view of the mechanism shown in Fig. 10.

Fig. 12 is a cross-sectional view through the selector vanes showing the sixth vane in the shifted or figures position.

' Fig. 13 is a view similar to Fig. 12 showing the sixth vane in the unshifted or letters position.

Fig. 14 is a wiring diagram of the motor controlling circuit.

Fig. 15 is a fragmental plan view showing the motor drive connections.

Fig. 16 is a circuit diagram of a printing telegraph system embodying the present invention.

As set forth in the copending application of which this is a division, the combined sendingreceiving apparatus comprises essentially a printing unit and a keyboard transmitting unit. Although various forms .of transmitting mechanisms may be employed the one chosen to illustrate the present embodiment is the transmitting mechanism disclosed in U. S. Patent 1,595,472.

As indicated in Figs. 1 and 2 the keyboard unit is readily insertable into the base portion of the printing apparatus and is detachably secured thereto by means of suitable shoulder screws. Briefly, the keyboard unit is provided with a set of keys arranged similar to the well known typewriter keyboard and the key levers are pivotally mounted on a common shaft and are spring held in normal horizontal position by individual Arranged transversely below the key levers in operative relation thereto are a series of five notched selector bars which are adapted to be operated permutably in accordance with each key lever depressed to operate a series of contacts correspondingly and to establish circuits for the transmission of a series of signal code combinations which are received at the receiving station by a single selector magnet in the printer apparatus.

The selector magnet, being responsive to these received impulses, is energized or deenergized in correspondence with the nature of the impulses, as is well known. The apparatus herein disclosed is operated by various code combinations of impulse conditions and is selectively controlled. thereby. These impulse conditions are. translated into mechanical operations and functions by means of a selector mechanism 15, through a selector magnet 16.

Having reference to Figs. 2 and 3, the selector magnet lfioperates a selector armature lever 17 as it is energized and deenergized. The successive conditions of lever 17 determine the positions of a series of selector fingers or swords 18 which in turn control the operation of a set of T-levers 19 to move the selector vanes 21 to correspond to the received code combinations. Thus, the setting of the selector vanes determines either the selection of a character to be printed or the selection of a function lever 22. A number of function levers are provided to perform various functions or operations other than printing, and when a function lever has been selected it is permitted to rotate slightly about a common pivot shaft 23 by means of its individual spring 24. The functions and operations of a remotely located printing apparatus thus may be controlled by the selective operation of one of the function levers 22. i

The electromagnet 16, referring to Fig. 3, has an armature 25 fixed to the lever 17 which is supported upon a pivot stud 26. A spring 27 has one of its ends secured to armature 25 and its other end secured to an adjusting screw 28 (Fig. 2). The magnet 16 is connected to a signal line 20 which is normally energized and" holds the armature against the tension of its spring 27. As indicated in Fig. 3 one end of the lever 17 is T-shaped and is provided with a pair of laterally extending arms or abutments 29 and 31, which cooperate with arms 32 and 33 on the rear end of selector fingers or swords 18 to position the latter either in their right or left hand positions.

The selector fingers 18, of which there are five in the present instance, are thin fiat members separated by thin flat guide plates 34 which serve to keep selector fingers 18 properly spaced. The guide plates are mounted on studs 35 and are themselves spaced by washers 36, the studs being aflixed to frame 3'? (Fig. 6). The selector fingers 18 are adapted to go through two different movements, first, a reciprocating movement and then a rocking movement. Each selector finger 18 has a V-shaped end with which it engages its respective rockable T-lever 19 also arranged be: tween the guide plates 34 and the several of which are pivotally mounted on a stud 30, and each comprises three arms.

Arms 38 of each T-lever are provided with rounded ends, as shown, and engage bifurcated members 39 fixed to the selector vanes 21 and act through T-levers 19 to position the selector vanes 21.

As indicated in Fig. 1 the vanes 21 extend almost entirely across the printer and are adapted to be rotated either clockwise or counterclockwise for selection purposes. These vanes are adapted to control the setting of a series of permutation code bars for character printing (as set forth in the copending application) and the selection of a series of funct'on levers for the various functional operations.

Power for operating the selecting mechanism is supplied by a motor 41 (shown in Figs. 2 and 15) through a pinion 42, mounted on the motor-shaft, and gear 43 keyed to main shaft 44 of the printer.

The main shaft 44 is suitably journaled' in antifriction bearings 45 and 46 (Fig. 15) and/mounted upon the shaft near one end thereof is a cam barrel 47 (Fig. 3) frictionally connected to the main shaft 44.

The cam barrel 4'7 (Figs. 3 and 6) has a spirally arranged series of cams 48, one for each of five bell cranks 49, whereby the latter are rotated in succession about their common pivot 51, and are thus caused to reciprocate their selector fingers 18 successively by reason of circular portions intermediate the arms 32 and 33 of selector fingers 18 engaging cooperating socketsin bell cranks 49. In addition to this longitudinal reciprocal movement, the free ends of selector fingers 18 have a lateral swinging movement between a pair of studs 52. Springs 53 associated with bell crank levers 49 normally hold the selector fingers 18 in their forward or right-hand position (as viewed in Fig. 3) in engagement with the T- levers 19, whereat each selector vane 21 is held in a corresponding one of its two positions aforementioned.

The abutments 29 and 31 of the armature lever 17 are located to the left of the arms 32 and 33 of the selector fingers 18 (as viewed in Fig. 3), but are spaced more closely together than the ends of the arms 32 and 33 so that as the armature lever 17 oscillater in response to the received signal conditions abutments 29 and 31 alternatively move into and out of alignment with their respective ends of arms 32 or 33. The selector magnet 16 responds to one of two electrical conditions tohold its armature lever 17 as each of the fingers 18 is reciprocated through lever 49 by a cam 48 of the spiral series of cams on the barrel 4'? to engage the lower stud 52. The arm '32 thus is brought into cooperative relation with the abutment 29 to set the'selector finger 18 in the position shown in Fig. 3. When the magnet 16 responds to the other electrical condition an arm 33 is brought into cooperative relation with abutment 31 to move the corresponding selector finger 18 against the upper stud 52. In this manner the selector fingers 18 successively are set in variant combinations.

Referring to Figs. 6, 8 and 9, a stop arm 54 rigidly attached to the cam barrel 4''! is provided with an upturned end which normally engages a lug 55 on the lower arm of a U-shaped stop gate 56, mounted upon a pivot stud 57 the upper arm of which is adapted to be engaged by a latch 58 which is pivoted at 59 to a journal block forming part of an adjusting plate 61, which in turn is rotatable about a pivot stud 62 mounted on the under side of orientation plate 63.

The plate 63 is fixed to the frame of the selector, and is arranged to be clamped thereto through the agencyv of arm 64 and clamping screw 65. Thus plate 61 is adapted to cooperate with a scale on the orientation plate to indicate various adjusted positions.

A spring 66 extending from gate 56 to the frame of the selector tends to rotate the gate clockwise, as viewed in the Fig. 8, while stop arm 54 being frictionally driven by shaft 44 tends to rotate the gate in reverse direction, in which it is restrained by the latch 58. The pivot stud 62 is coaxial with the inner end of the latch 58 as well as with the axis of the shaft 44. A spring 67 is compressed between the latch .58 and the adjusting plate 61 and normally holds the outer 'end of the latch depressed and in position to engage the upper end of the gate 56, while a trip member in the form of a small bell crank 68 pivo;allymounted in the block 69 through its inner end is adapted to'engage the adjacent end of the latch 58 at a point in line with the axis of shaft 44 and with the axis of the pivot stud 62. A plunger 71 extending through a block 69 engages one arm of the bell crank 68 and is in turn engaged by the eccentric head of screw 72 mounted on the upper arm of the armature lever 1'7. The operation of the selecting mechanism is as follows: The selector magnet 16 is normally energized, but during the first lineimpulse or start interval, which is of spacing or nocurrent nature, the magnet 16 is deenergized and the movement of its armature lever which will be efiected by the spring 27 will cause the head of the screw '72 to shift the plunger 71 and thus rock the bell crank 68 to depress the inner end of the latch 58 and rock the latch about its pivot 59 to effect its disengagement from the gate 56. Gate 56 is then rotated in a counterclockwise direction against the action of spring '66 by the torque of shaft 44 through arm 54 against it as the cycle of operation of the cam barrel is thus initiated. Prior to the reception of the first lineimpulse or start interval rotation of cam barrel 47 by shaft 44 through friction clutches 73 and 74 is prevented by engagement of arm 54 with stop gate 56, which is held by latch 58.'

l/Vhen, however, latch 58 is disengaged upon the receipt of the start interval, the cam barrel 47 is released for rotation with shaft 44. and as soon as the stop arm 54 passes the end 55 of the gate 56, the gate 56 is returned to its clockwise position by its spring 66. During the signal code, the latch 58 will be vibrated incidentally but w'thout effect by the several signal pulses of the code combination as received, but the stop impulse of marking nature, which always terminates the cycle, will permit the withdrawal of the screw '72 from the plunger '71 and thus permit the spring 67 to influence the latch 58 and the bell crank 68 until the former is enabled to engage the upper arm of the gate 56 to cause the arrest of arm .54 and to prevent further rotation of cam barrel 47. The parts are so arranged that the cam barrel 47 is stopped positively by the gate 56 at the end of each cycle and is readily released by the starting movement of the armature lever 17; also'the tripping arrangement permits the orientation adjustment of the gate 56 so that the engagement of the first cam 48 and its cooperating bell crank 49 will occur during the most favorable portion of the first impulse interval of the received selective code.

Should the first selective signal condition be a marking impulse condition, the selector magnet 16 will be energized at the time that the first cam 48 operates the bell crank 49 and first finger 18, whereat the latter is adjusted to its markingposition. Had the first impulse after starting been of spacing nature, the armature 17 would have remained in its spacing or unattracted position after the normal spacing start impulse. The first cam 48 would then operate the first bell crank 49 and its finger 18 to its spacing position. The remaining impulses affect the selector mechanism similarly.

To provide a wide margin of operation, the setting of the primary selectors or fingers 18 should be selected or determined at definite point".

or very brief intervals uniformly spaced throughout the selecting cycle, so that such points may register with the mid-portions of the intervals of the received signals or code combinations. It is difficult, however, to so construct the parts of a mechanical selector so as to effect such an operation and particularly where, as is highly desirable in order to permit rapid operatiomthe parts are of light weight and the vibratory movement of the armature lever slight. To provide for a wide margin, however, means is employed for intermittently locking the vibrating armature lever 17 in one or the other of its selecting positions, such locking occurring at definitely spaced points in the selecting cycle, which points are slightly in advance of the time intervals or portions of the cycle during which the setting of the selectors or fingers 18 is effected.

In the preferred form, the locking device comprises a lever '75, Fig. 7, pivoted on a stud '76 and arranged between the two uppermost guide plates 34. The lever is provided with a nose or shoulder 77 and a spring '78 to hold it in engagement with the-periphery of a cam 79 that forms part of and rotates with the cam barrel 47. This cam is provided with a series of projections 81, five in number, which successively vibrate the lever 75 during each operating cycle. The end of the lever '75 is also provided with beveled locking dog 82 which cooperates with a wedge portion 83 fixed to the under side of the armature lever 17. When the nose 77 of the locking lever 35 is on the high portions of the cam 79, the looking dog 82 is out of the path of cooperating wedge portion 83, but when the nose enters the intervening spaces between cam projections 81, the locking dog 82 engages wedge portion 83 and holds the armature lever against movement.

The number of cam projections 81 corresponds to the number of selecting intervals of each signal and they are so spaced-that the locking device 75 is quickly shifted into engagement with the armature by the spring 78 at definite points in each revolution or setting cycle of the cam member 79; which points are so arranged that the armature lever is locked in one or the other of its positions just before any engagement of the arms 32 and 33 with their associated abutments 29 and 31 occurs, so that the setting of the respective selectors is accurately determined at such intervals. Furthermore, the cam projections 81 are so arranged that the armature lever is held against vibration while the arms 32 and 33 of the selecting fingers are in engagement with the abutments 29 and 31, and in this way the armature lever is securely held. It will be observed that in addition to the five positions on cam 79 above mentioned there is provided a longer dwell or high portion adapted to hold locking dog 82 out of engagement with wedge portion 83 when cam 79 is in the stop position. The reason for this will become apparent hereinafter under the consideration of the motor-control mechanism.

An electrical circuit of a printing telegraph system to which the present invention is adaptable is shown in Fig. 16, the stations A and B each being combination sending and receiving stations. Since a complete description of this circuit is given in the copending application, only so much will be described here as pertains to the present invention. The circuits at stations A and B are alike, and the same parts, when found necessary to be referred to, are designated by the same reference numerals. Assuming that station A is conditionedto transmit messages and station E is conditioned to receive messages, the circuit for transmitting code signal impulses over the line wire 130 is completed from grounded battery 131, over wire 132, through keyboard had contacts 133, over wires 13% and 135, through break contact or switch 136, through polar relay 137 (which controls selector magnet 16), over line wire 130 thence through the polar relay 137 at the receiving station to ground (the polar relay 137 at the receiving station affecting its associated selector magnet 16 in a manner well known in the art). It is obvious that the opening or breaking" of contact 136 of either station breaks the signal line circuit. The function of contact 136 will clearly appear from the ensuing disclosure.

The purpose of the motor control mechanism is to start and stop the printer motor by remote control over the signal line. The invention provides that the printer motor shall be automatical ly stopped upon the reception of two similar code signals of predetermined combination successively transmitted. It has also been provided that the motor shall be automatically started upon the opening or breaking of the signal line for a brief interval, as for instance, by simultaneously depressing levers 84 and 85 of the send-receive break mechanism (Fig. 4) to rotate lever 127 to in turn open contact 136, as clearly set forth in the aforementioned copending application. The power supply from a local source is connected to the printer motor through the motor control contact switches 86 and 87, appropriately lo-; cated at the front of the printer as shown in Figs. 1, 5 and 14:.

The contacts 86 and 8'1 are connected in parallel with each other and in series with the printer motor, as clearly illustrated in Fig. 16. The right hand contact 86 is operated by arm 92 of lever 66, Figs. 3 and 5, which closes said contact when the motor stop function lever 22 is in its unsc lected position, as will hereinafter appear, and said lever 88 also permits contact 86 to open due to its own spring tension when the motor stop function lever 22 is in its selected position. The left hand contact 6'! is normally open and is closed only during the cycle of operations following the selection of the motor stop function lever 22, for the purpose of preventing the stopping of the motor while said lever 22 is in its selected position. However, should the printer motor come to rest, while the motor stop function lever 22 is in the selected position, it would be impossible for lever 68 to close its associated contact 66 when it is again desired to start the motor. The foregoing will become apparent in the following detailed disclosure.

Referring to Figs. 3 and 5, attention is had to function levers 22 and 68 which are rotatably mounted on coon fulcrum shaft 23. One arm 69 of lever 66 (Fig. 3) is adapted to cooperate with an arm 101 of a substantially U-shaped motor-stop lever91 while the other arm 92 coacts with contacts 66; also, lever 88 tends to rotate in a counterclockwise direction, as viewed in Fig. 6, under the influence of spring 93. The normal tendency, therefore, of lever 68 is to keep contact 86 closed. Function lever 22 is conduced to clockwise rotation by its spring 24, but is normally restrained from such rotation by the action of a function bail 94 upon an arm 95 thereof (Fig. 5) as set forth in said copending application. Arm 90\of lever 22 is also adaptedto cooperate with arm 101 of motor stop lever 91, and arm 97 cooperates with T-lever 98. Motor stop lever 91 is rotatably mounted on a lJ-shaped bracket 99, Fig. 5, which in turn is fixed to the frame. Lever 91 comprises the substantially horizontal arm 101 which also co-acts with arm 89 nosncva of lever 88, and a substantially vertical arm 102 to which is attached one end of spring 103 urging lever 91 in a clockwise direction against a stop 104 (Fig. 3).

1 Referring to Figs. 10 and 11, it will be seen that to the free end of arm 102 of motor stop lever 91 is pivotally connected 2. pair of latches comprising an upper latch 105 and a lower latch 106, adapted to engage extension 107 of armature lever 17. Saidlatches 105 and 106 normally tend to bear against a stop 108 due to the distendingaction of a spring 109 against their respective opposite portions 110. Armature lever extension '107 is provided with step 112, with which lower latch 106 is adapted to engage, while upper latch 105 engages the inside face of extension 107, the purpose of which will hereinafter appear.

Mounted on ,pivot 113, Fig. 3, which is common also to lever 91, is a release lever 114 provided with a pin or stud 115 fixed thereto and arrangedto extend through a slot 116 in lever 91 and adapted to cooperate with the depending arm of the armature locking lever 75 (Fig. '7). The free end of release lever lll'is provided with an eccentric adjusting screw 11'! to co-act with an arm 118 of lower latch 106. Also,-located substantially adjacent pin 115 and secured to lever arm 102 is an eccentric adjusting screw 119 to cooperate with arm 121 of release lever 114. The purpose of release lever 114, as will hereinafter become apparent, is to provide a safety means to insure the operativeness of the motor control device of the present invention.

I As before mentioned, arm 97 of motor stop function lever 22 cooperates with T-le'ver 98. Referring to Fig. 5, it will be noted that the laterally disposed end 122 of said arm 97 co-acts with adjusting screw 123 mounted on lever 98. This operable relationbetween levers '22 and 96 is required to insure that the printing unit will always be in communicative relation with the others; that is, that the signal line will always be closed at the completion of a cycle. As set forth in the hereinbefore mentioned Patent No. 1,595,- 472 relating to the keyboard associated with the present invention, said keyboard in its transient operative positions is adapted to open and close the signal line. Now, since the keyboard receives its power directly from the printer main shaft it will be apparent that should the motor be stopped indiscriminately there is a possibility that the keyboard shaft will be stopped while in an operating position with a line contact open, thereby rendering the printers non-communicative.

It has been hereinbefore set forth that the automatic stopping of the motor is accomplished by the reception of two successive similar code signals; namely, the figures shift signal. Upon the reception of the first of these signals the apparatus is operated in the following manner: the sixth vane 124 (Figs. 12 and 13) is efiected by the shifting or unshifting of the platen, upon receiptof a figures shift or a letters unshift signal. Now, in order to render the motor stop function lever 22 operative, the sixth vane 1241 must assume the position shown in Figs. 3 or 12, which is the shift or figures position. Therefore, the first of the two similar motor stop signals merely'places the sixth vane 12% in the proper position to register opposite its respective notch in the motor stop function lever 22 whereby it may effect the selection and operation thereof. Upon the reception of the second successive motor stop signal, which also is the "figures shift sig= Mill) nal the selector vanes will assume their predetermined positions to agree with the respective code notches in the motor stop function lever 22, thus allowing said lever to rotate in a clockwise direction about fulcrum 23 under the influence of its spring 24. This rotative motion imparts through end 122 (Fig. 5) of lever 22 and arm 125 of lever 98 counterclockwise rotation to the latter lever 98, which through its end 126 efiects lever 127, as described in said copending application, to cause the send-receive break mechanism (Fig. 4:) to assume its receive position; that is, its position for receiving messages. It is necessary that upon automatically stopping the motors of the apparatus connected in the line said apparatus be also automatically conditioned to receive messages, in which position the apparatus would be prepared to receive the motor start signal which comprises opening and closing the signal line, as shall presently appear. The rotation oi the motor stop function lever 22, as above mentioned, also, through its arm 97, closes motor control contact 87 until the cycle of operations of the apparatus has been completed, during which cycle contact 86 is opened. At the completion of the cycle contact 87 is again opened, when function lever 22 is restored to its unoperated position by the coaction of function bail 94 with arm 95, thus breaking the motor circuit and causing the motor to stop.

This clockwise rotation of lever 22 imparts, through its arm 96, rotation in the opposite direction to motor stop lever 91, Fig. 3. Arm 101 of lever 91 imparts clockwise rotation to contact operating lever 88 against the action of its spring 93, thereby permitting contact 86 to open so long as motor stop lever 91 is in the latched position presently to be set forth. The counterclockwise rotation of arm 102 of lever 91 carries the pair of latches 105 and 106 mounted thereon to the left, so that upper latch 105 is caused to engage extension 107 of armature lever 1'7 since said armature lever is normally in the marking or attracted position due to the face that selector magnet 16 is always energized while thetprinters are in communicative relation. Such is the relation between the motor stop lever and the selector arma ture lever while the motor of the printing apparatus is stopped and the line circuit closed. It should he understood that, as before mentioned, locking dog 82 is held out of engagement with wedge portion 83, for the reason that, if such were not the case, and locking dog 82 were permitted to engage the underneath side of wedge 83, (as shown in Fig. 7), armature lever 17 would be locked between said locking dog 82 and upper latch 105, thereby rendering the printer inoperative.

Now, when it is desired to start the motors of the printers which are in communicative relation, the keys 8 1 and 85 of the send-receive break mechanism (Fig. 4) are depressed simultaneouslyr to theaforementioned break position 128 and are so held for a period of time equivalent to the transmission of at least two code-signals. The operation of keys 841 and 85 in this manner rocks lever 127 in a clockwise direction to open contact 136, and as a result thereof, the signal line 130 is broken at contact 136 causing the deenergization of selector magnet 16 and the release of armature 17 which will rotate slightly in a clockwise direction under the influence of its spring 27 to effect the disengagement of latch 105 from extension 107 and the engagement of latch 106 with the step 112 as indicated in Fig. 10. This is the relation that obtains between armature l7 and motor stop lever 91 so long as contact 136 is held open (that 1 is, as long as the signal line is broken). It is noted that in this position latch 105 is disengaged from extension 107 and is out of operative alignment with said extension so that when extension 107 is again actuated vertically, due to the closing of contact 136 by the release of levers 84 and 85 to effect the energization of magnet 16 and the counterclockwise movement of armature 17, step 112 will be lifted out of engagement with latch 106, and latch 105 will be rocked against the action of spring 109, thus permitting the motor stop lever 91 to respond to the urge of its spring 103; the latch 105 merely slipping oil the upper surface of extension 107. The resulting clockwise movement of lever 91 (Fig. 3) therefore permits lever 88 to rotate in the oppositddirection under the action of its spring 93 to close contact 86 in the motor circuit to eiiect the starting of the motor. It is obvious that the breaking and fmaking of contact 136 is necessary to start the motor. In the event that the line circuit is either inadvertently opened or is purposely opened after the days run, the motor will not be started because as explained above the latch 106 will engage step 112 thus preventing this occurrence. The motor, therefore, will remain inert until the line circuit is again closed.

As previously mentioned, release lever 11 1 (Fig. 10) is provided to insure the operativeness of the motor control device. Having reference to Fig. 7, the cam 79 is there shown not in its normal stop position, but rather in one of its transient positions for purposes of illustration. In the normal stop position of the cam 79 its surface 138 is presented toward the nose 77 of lever 75, thus holding locking dog 82 out of engagement with wedge 83 while the cam 79 (and hence the selector) is in its normal stop position. If it were not because of the release lever 114 a condition as shown in Fig. 7 would possibly occur wherein the armature 17 would be locked against movement with the cam 79 stopped in other than its normal stop position, thus rendering impossible the selective operation of the armature. This condition would obtain in the event that the operator, after sending the pair of motor stopsignals, inadvertently strikes another key, thus sending out a newcode combination of signal impulses, the start impulse of which is received the instant before the motor has come to a complete stop, thereby effecting the release. of armature 17 and operation of plunger 71 to in turn release the cam 79 preparatory for another cycle of rotation. But should the motor have just enough momentum to rotate cam 79 an angular distance representative of the first impulse interval (start interval) the condition shown in Fig. 10 will obtain, the locking dog 82 will engage the upper surface of wedge 83, and the nose 77 will enter the firstnotch in the cam 79. Now, the effectiveness of lever 114 will become apparent, because by its use the condition just represented cannot occur, because as soon as nose 77 of lever 75 enters the notch in cam 79 the depending arm of lever 75 (Fig. 7) impels pin 115 toward the right to in turn swing lever 114 (to which pin 115 is attached) to the right (Fig. 10). This movement of lever 114 imparts counterclockwise movement to lower latch 106 to effect the disengagement thereof from step 112, the effect of which has already been described. The motor will thereupon be again started, and since the apparatus his transmitted motor stop signal has been inat the sending station operates in response to the transmitted signals in exactly the same manner as the apparatus at the receiving station,

the sending operator is apprised of the fact that I transmitting and recording apparatus, it. is, of

course, understood that the invention is capable of embodiment in many forms other than that particularly disclosed without departure from the spirit and scope of the invention as defined in the appended claims.

What is claimed is:

i. in combination, a recording mechanism, a motor for operating said mechanism, a power supply circuit for said motor, a pair of contacts in said circuit, and means for operating said contacts successively to insure stopping said motor with the recording mechanism in a predetermined position.

2. In a signaling system, a signal circuit, a recorder in said circuit responsive to code com binations of signaling conditions, a motor for driving said recorder, a power supply circuit for said motor, and means to control the supply of power, said recorder including mechanism to stop said motor with said recorder invariably in said motor for starting by interruption of said signal circuit.

3. The invention as defined in claim 2 in which said recorder is provided with a single control electromagnet responsive to said code combinations of conditions, said motor control means being mechanically associated with the armature of said electromagnet.

4. The invention as defined in claim 2 in which said control means includes,,means to prevent starting of said motor while said signal circuit is interrupted.

5. in a telegraph system, a signal circuit com= prising a plurality of interhommunicatingsta tions, recorders at each station with motors in dividual thereto, means for transmitting code combinations of signaling conditions between stations to control said recorders, and means op= erable from one station to control the supply of power to the recorder motor at a distant station, including mechanism to stop said motor with said recorder invariably in a predemrmined po= sition in response to predetermined signaling conditions, and means to condition said motor for starting by interruption of the signal circuit.

6. In a signaling circuit, a recorder including a single magnet selector mechanism'responsive to code combinations of signaling conditions, a motor for said recorder, and means to condition said motor for starting whereby said motor is subsequently started in response to an intt-irrup= tion of said signal circuit.

7. in a signaling circuit, a recorder including a single magnet selector mechanism responsive to received code combinations of electrical con= ditions, a driving motor therefor, and means mechanically associated with said selector mech= anism to control the starting of said motor in response to opening and then closing said signal: ing circuit.

8. In combination, a selective recorder responsive to received code combinations oi electrical eandra conditions, a driving motor for said recorder, and means operable from said transmitting station to stop said motor with the recorder invariably in a predetermined condition in response to a plurality of predetermined code combinations of conditions.

9. The combination as set forth in claim 8 in which said predetermined code combinations are of like character.

10. In a selective mechanism, a selector magnet responsive to the received code'combinations of signaling conditions, an armature for said magnet adapted to perform selective control oper= ations by its movement between two positions, an element for positively maintaining said armature in either one of said two positions during selective operation thereof, a driving motor, motor starting means controlled by said armature, and

inter-engaging mechanism between said motor starting means and said element whreby said motor starting means is prevented from becoming inoperative when said armature is held stationary by said element.

ll. In combination witha control. circuit, a single magnet selector mechanism, a driving motor therefor, a power supply circuit for said moe tor, motor stopping mechanism, motor starting mechanism, and mechanism responsive to code signals to operate said motor stopping mechanism and thereby condition said motor starting mechanism for operation, said motor starting mechanism adapted to respond to a subsequent interruption of the control circuit to start the motor.

12. In a selective system, a drive motor, a power supply circuit therefor, a single magnet controlled selecting mechanism driven by said motor including an armature, latch mechanism associated with said armature, comprising selectable means for stopping said motor and causing operation of said latch mechanism to prevent the starting of said motor under predetermined conditions.

13. In a printing telegraph system, a plurality of intercommunicating stations each provided with a motor and a motor controlling circuit,

.means in said motor controlling circuit controllable by an operator at a distant station to control the supply of power to the motor, a single magnet selector mechanism, and means mechanically associated with said selector mechanism to control said first recited means, said last re- A 1130 id. 1th a selective mechanism, a selector magnet responsive to received code combinations of signaling conditions, an armature for said mag= I net adapted to perform selective control operations by its movement between two positions, motor control means selectively controlled by said armature, a stepped extension integral with said armature, and means including a pair of latches adapted to co-act with said extension to stop the motor, said latches and said extension being 1% cooperatively related to efiect the starting of the motor only upon one complete oscillation of said armature.

15. in a selective mechanism, a selector mag= net responsive to received code combinations of 5 signaling conditions, an armature for said magnet adapted to perform selective control operations,

a stepped extension associated with said arma- ,ture, a pair of latches, a motor, and means to gamma extension to control the operation of said motor.

16. In a printing telegraph receiver, a selector mechanism, an electromagnetic means for determining the operation of said mechanism, a driving motor, a pair of contacts in the operating aircult of said motor, one of which is normally open and the other of which normally tends to close,

and a function bar responsive to a particular setting of said mechanism for closing one of said pair of,contacts momentarily and opening the other of said pair thereof to control said motor.

17. In a printing telegraph receiver, a selector mechanism, an electromagnetic means for determining the operation of said mechanism, a driving motor, a pairof contacts in the operating circuit of said motor, one of which is opened and the other closed during the operation of the motor, and a function bar responsiveto a particular setting of said mechanism for controlling the sequence of operation of said contacts for the stopping of the motor.

18. In a printing telegraph receiver, a selector.

mechanism, an electromagnetic means for determining the operation of said mechanism, a driving motor, a pair of contacts in the operating motor, means normally tending to close one or saidpair of contacts, and means operated under the control of said electromagnet for rendering said last mentioned means effective to close the contacts associated therewith.

19. In a printing telegraph receiver, a selector mechanism, an electromagnetic means for determining the operation of said mechanism, a driving motor arranged to have its operating circult controlled by said mechanism, and means responsive to a predetermined operation of said selector mechanism for opening and then temporarily closing the circuit of said motor.

20. In a printing telegraph receiver, a selector mechanism, an electromagnetic means for determining the operation of said mechanism, a driving motor arranged to have its operating circuit controlled by said mechanism, and means responsive to a deenergization of said electromagnet followed by an energization thereof for closing the operating circuit oi said motor.

21. In a printing telegraph receiver, a selector mechanism, an electromagnetic means for die termining the operation of said mechanism, a driving motor arranged to have its operating cir cuit controlled by said mechanism, means re= sponsive to a deenergization of said electromagnet followed by an energization thereof for closing the operating circuit of said motor, and latch mechanism operative with respect to said elec== tromagnet for requiring the predetermined deenergization and energization of said electrognet to start said motor.

22. In aprinting telegraph receiver, a selector mechanism, an electromagnetic means for de termining the operation of said mechanism, a driving motor arranged to have its operating cir cuit controlled by said mechanism, means re-= sponsive to a deenergization of said electromagnet followed by an energization thereof for closing the operating circuit of said motor, latch mechanism operative with respect to said electromagnet for requiring the predetermined deenergization and energization of said electromagnet to start said motor, and means effective should said selector mechanism stop in a predetermined peeltion to render said mechanism inefiective.

23. In a communicating system, a signaling circuit, a recorder including a selector mecha nism responsive to received code combinations of signaling conditions, a driving motor therefor, and means associated with said selector mecha-: nism comprising a double tripoft latch to control the starting of said motor in response to opening and then closing said signaling circuit.

24. In a communicating system, a signaling circuit, a recorder including a selector mecha nism responsive to received code combinations of signaling conditions, a driving motor therefor, and means associated with said selector mechanism comprising a double trip-ofi latch to control the starting of said motor in response to open= ing and then closing said signaling circuit, said means including means to insure the invariable operation of said latch.

' STERLING NORTON.

I HOWARD L. UM.

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