US1972303A - Motor control for printing telegraphs - Google Patents

Description

Patented Sept. 4, 1934 PATENT OFFICE Moron 'ooNrRoL FOR PRINTING TELEGRAPHS Delaware Application June 14, 1933, Serial No. 675,738

. .23 Claims.

. This invention relates to systems and apparatus for operating'printing telegraph machines, and more particularly to systems and apparatus for controlling remotely theoperation of the driving motors of such machines, a I H I. Systems for the remote control of driving motors of printing telegraph receivers have been devised in which a; determined sequence v of line operations resultin stopping the motors at all connected stations andin which, further, a different sequence of line operations will start the motors at all stations. These systems employ local circuits responsive to indirect control over the line for opening or closing a local circuit momentarily, which willresult in setting up acondition for starting or stopping the driving motor, which condition will continue until other signals .over the line result in restoring the operating ornonoperating condition of the motor.

Telegraphic electrical operations are, for the most part, exceedingly short in time duration tomeet the general requirement for. high speed, and when a remote control-operation produces a momentary condition in a local circuit, the time of the local condition may be exceedingly short. It is advisable, therefore, to devise means for prolonging amomentarytelegraphic condition to insure that local apparatus shall have sumcient time to operate fully, The object of this invention, therefore, is to provide means for prolonging by local control a condition which may be set up momentarily by remote control over the telegraph line. v V V 7 A feature is to provide asystem wherein the additional equipment. which is provided for the various functions will 1 not interfere with, the, ordinary purposes of the transmission ofintelligence by normaloperation,

A further feature is tO IJIOVldG a telegraph system so arranged that it maybe left unattended by removing all poweror signalling current from the line circuit without changing the motor control condition; j v 1 A still further feature s to provide such conditions inthe local'system thata telegraph current of any characteristic, either alternating or continuous, maybe usedto operate the local motor control apparatus.

The objects.-andifeaturesi of this invention are such as may be obtained by the utilization of'the various combinations and sub-combinationshereinafter more. fully set forth, and as defined by the scope of the appended clams Theseobjects are attained by providing niechanical latches in a printing telegraph receiver,, one of which may .be

operated in response to telegraphic signals .over the line, and another'of which may be. operated subsequently by the mechanical action of the printer in its normal printing cycle, the arrangement of the operating latches and their controlling members being such that the delay between the operations of a first latch and a second latch shall .be ample to permit the full operation of the functions controlled thereby to effect the stopping of the driving motor. 7

While. many systems provide for stopping the motor by brief interruption of the line circuit or by an extended period of interruption of the line circuit or by reversal of the polarity of the line current or by other changes in the nature of the line current, and while this invention may be adapted for such control, the system herein shown adapts-a local motor control device to respond to a local circuit, which in turn is controlled by a double code of line signals comprising the combination in determined sequence of two codes normally used in the transmission of intelligence, the local circuit being modified throughout a time period beginning as a result of the operation of the second code and ending after a determined duration resulting from the consecutive operation of an orderly chain of mechanical devices.

In response tothe first signal code, a mechanical condition is set up in locking manner so that it endures until after the response to the second code, and inresponse to the second code a mechanical operation occurs which depends jointly upon the receipt of the second code and the continuanceof the condition set up by the first code and the second response is rendered stable and continuous by the mechanism of this invention, and later is terminated after a suitable time interval by further operation of the mechanism of this invention.

Equipment to be added to the printing tele-. graphtypewriter comprises two parts, one part of which is an assembly of electrical devices which will stop the driving motor inresponse to a local signal impulse, and the second part of which is .the apparatus for producing the local signal impulse. The present invention pertains essentially to the production of the local impulse for initiating the motor control function and thespecific motor controlling assembly of apparatus 105 may be of any preferred type such as. that. described in application Serial No. 622,859 for Electromagnetic devices, filed by Oscar A.Morgenstern on July 16, 1932, or such as that described in application Serial No. 595,503, for Motor conno dition is shown in Fig.3, amiss suitable for op eration of a motor control device as'disclosed in the D. S. Hulfish application above identified. A modification is shown in Fig.4. The rocking shaft: 60, contact pair 56, contact pair '57,: and striker 55 are the parts shown in Fig. 1,and are identified by the samelabels; The arm 63 also is identified'in Fig. 1 where it is arranged to' operate the contact pair 74, but in Fig. 4- it is arranged to operate the contact pairs '56: and 57 through mechanicalcooperation with striker 55, by which a s' 'plified electrical circuit is attained.

A rocking arm 76 is pivotedupon the frame at 77 and is urged byspring :78 into engagement with the striker '55; The arm 63 carries a finger 80, pivoted at 81- upon the arm' 63 and urged clockwise by spring 82 into engagement with pin 83 fixed upon the rocking arm 76. The operation of themodification shown in Fig. 4 is as follows: At each operation of the specific type bar 40, the rocking shaft 60 moves the arm 63 into the dotted'line position which carries finger 80 to slide uponthe pin 83 into its extended dotted linep'os'itiomthe movement of the finger 80 being thus-ineffective upon con tacts- 56 and 57. should'the code"shift be recordedupon the code bars 10, it will result in the movement of striker 55, which in the modification of Fig. 4 will move the rocking arm 76 into its alternative or dotted line position, thus moving the pin 83 into its alternative dotted position and moving the finger 80 into its dotted line position, in which position the members 55, 76, 80, and 83'Wil1 be held pending the receiptof unshift code upon the code bars 10, While the shift striker 55 is held shifted to hold the rocking arm 76 in its dotted position, should the specific type bar 40 be operated, the armf03 will be operated and the finger 80 now in its vertical dotted line position will be propelled to strike the operating springs of the contact pairs 56 and 57 and to operate those contacts, in which opera tion the tooth 64 will pass the tooth 72 and will be restrained by the tooth 72 to maintain the contacts 56 and 57 operated until latch subsequently is lifted by cam follower 19. The result, electrically, will be identical with the result attained in Fig. 1 or Fig. 3," depending upon whether contacts 57 or 56 are connected for service. Apparatus of the O. A. Morgens'tern device shown in Fig.2 is as follows: With motorsnonoperating, a line circuit extendsiromground 101 through battery 102, manual switch 103, typewriter operating magnets 104, relay contact pair 105-, wire 106, winding of locking magnets107,

wire 108, wire 109, manual switch "110, line jwire 111, stations 112 and 113 to ground 114, thus holding-the locking magnet- 107 energized. Qperating relay 115 has 'anarrnature 116 which} when released to be retracted by its spring 119, causes its contact pair 117 toiclose,its contact pair 118 to close, and its contact pair105' to open. In normal condition of idleness, asshowmthe armature" 116 is restrained by a latch lzomounted upon apivot 121 which is common to the latch 120 and armature 122' of locking magnets 107 and. which-isdrawn toward the armature 122 by spring 123 and: is: restrained bylufg "l24 which engages armature122. A return spring 125" is provided todrawthe armature 122 away from the locking magnets 107 and in its retracted position the notch 12 6 in a r mature 122 may engage the adjacent endof armature 116 or the armature l16.in. its retracted position may en-'- gage the armature 122toobstruct that annature against retractiom Contacts 57 and 74 are connected in series with magnet 115 and local power supply. 130.1 The contactsll'? are connected in seriestwith driving motor 131 and local power supply'l30. Contacts 105 are connected as a shunt around the transmitting contacts,132.; Contacts 18 are connected as a shunt upon the winding of the magnet 107. Stations 112 and 113 are similarly equipped. a Y

The operationofthe mechanism shown in Fig. 2 'is as follows: The motor isshown in non-operating condition. .By manual operation ofkey 110 at any station, the line. circuit described .will be opened, the magnets 107 at all stations will be Ydemagnetized, spring 125 will retract armature 122 thereby liitinglatch 120 to unlatch armature 116 to permit armature 116to move into engagement with notchizd, but not to move sufficiently to operate any or" its contact pairs 105, 117, and 118. Immediatelythereafter the key 110 is released to close thelinecircuit, which reenergizesmagnet 107and draws armature 122 to release armature 115,. whereupon armature 116 engages armature 122 mechanically to prevent its retraction by spring 125 and armature 116 operates contact pair 118, to shunt and deenergize magnet .107, operatesits contact pair 105 to remove the shunt irom transmitter contacts 132 and operates its contact pair 117 to close the power circuit of the motor 131, thus starting the motors 131 at all stations through similar operations thereat. To stop the motors 131 at all stations, any operating station by its transmitter 132 may send to all magnets 10 1 code signals to set the code bars '10 for the shiftcode, thereby operating and locking the contacts 57, and thereafter sending. in like manner the code to operatethe specific type bar 40 which will operate the contacts 74 to close and latch, thereby en ergizing magnet 115 and attracting its armature, thus operating its contact pair 117 to stop the motor 131, operating its contact pair 105 to shunt the transmitterl32 and operating its contact pair 118 to open the shunt of the locking magnet 107,

whereby the line current from battery 102 will energizethe locking magnets 107 and hold the armature 122 in the position shown in Fig. 2, thereby locking the armature 116 mechanically. All of these operations occur during the extended period of time between the operation of contact 74 by'striker- 66 and the unlatching of. contact 64 by n'iain shaft 21' and its cam follower 19. The line 111 may be opened for an extended period of time by opening the manual switch 103, during which time there will be no consumption of energy because then thecircuitof'magnet 115 is opened at contact pair 74, the circuit of motor 103 is o'penedat contact pair 117 andthe circuit of magnet 107 andlca is opened at switch 103.

In case the source or supply 130 should be a1- ternating current, the time periodprovidedibetween the operation of the striker 66 and the operation of the ,return of cam follower, 19 will be ample to include a plurality of alternationsof the current, thereby insuring. operation. of the magnet 105 which might not have responded had a momentary closure of the contact pair'74 occurred at the time between peaks of current and had'the interval not been extended by the system of latching of this invention. Even with a direct current source 130,the'magnet .115 has considerable work to vdoand requires a considerable time to reachits maximum magnetization,

BOY

which interval of time, is assured by .the system ofl'atching of this invention. Local control of a function of a receiving telegraph machine by the double code method, which comprises .first placing .the receiving device :in shift :position and then utilizing a normal recording function to effect a function entirely different, has been used successfully for motor control, but has required the provision of a quick-acting relay which would respond .to a momentary interval produced by the second code. Where :the motor control devices inthemselves are such that they are not adapted to respond to an extremely short electrical impulse, it :becomes desirable to supplement the control device by a sensitive relay reliablyoperated by themmomentary signal impulse or to .provide means for lengthening the signal impulse, and it is to the second alternative of this problem that the present invention is directed. In gen-- eralytheinvention comprises supplying a .me-. chanical latching means for extending the me chanical condition which controls the motor stopping impulse in preference to providing an electrical. condition for accomplishing an equivalent result.

'Ihe method of applying'the latching means and'the. specific design of the latch will vary with the printer to which the .device is to be applied, and although the invention has been described in connection with a specific form thereof, it will be understood that it has fur-'- ther applications and it is not intended to .be limited in scope by the embodiment shown herein for illustration.- 1

I The invention claimed is:

1.. In a telegraphic device, a code-controlled member, a power member, a latching member under control of said power member and operating to unlatch in every cycle of said power member, and a latchable member operable by said code-controlled member and cooperating with said latching member.

2. In a telegraphic device, a power member, an operatingv member, a selector responsive to code combinations of electrical signals to actuate said operating member, and a latching. de-' vice for controlling said operating member, and operated by said power member to unlatch said operating member at every cycle of operation of 'said member.

3. In a telegraphic device, a code-controlled latchable member, a cyclically controlled latching: member cooperating therewith and operating to unlatch at every cycle of operationpof'said telegraphic device, and an electric contact, controlled :by said code-controlled member.

4. In a telegraphic device, a latchable member, means momentarily operable for shifting said latchable member, a latch for said member. when in shifted position, and cyclic means for operating said latch in every cycle of said-telegraphic device to release said member. 7

In a telegraph typewriter, a power shaft rotatable in each printing cycle, an operating member operable to be shifted in a printing cycle, and a latch for engaging. saidoperatin'g member to delay the return of said operating member, said latch operable bysaid powerjshaft to release said operating member at the end of every printing cycle.

6. .In a telegraph typewriter, aprinting mem ber, main power shaft,andj a latching device comprising a latch member operatingy-to 'unshaft, a latchablemembgar ,oper ablegby .said

printing member, and. an, electric ,contact cone trolled by said'latched memberc I' 8. In a motor control system-,,a;;printing ber,.a power shaft, a latching device, including a first latch member operating cyclicallyto unlatclnat every revolution-bf. said power shaft; a second latch member operable by said printing member, and a motor,controlling device operable bysaid latching-device. ;f

9. In a motor control system, aprintin meme ber, a power shaft, a; latching device including a first latch member operating cyclicallyv at every revolutionaof said power-shaft, asecond latch member operable by said printing member, an electrical contact controlled.by-said latche ing device, and amotor controlling device operable under .control 'Of Said contact 10. In a motor control system, a printing train comprisin a series of; striking members, an-electricalcontact, a contact controlling member adapted to be struck and operatedby one of said train members, a latch for latchingsaid member when struck, a main-shaft, and a ,cam on. said main shaft controllingsaidlatch; to move into latching'position prior to the-operation of said contact controlling member andto move out of latching position subsequent to gthe striking :of said contact controlling ,member;

.11. In amotor control system, a printing train comprising a series ofv striking members, an electrical contact, a contact controlling member adapted to be operated by one of the members of said train, a latch for latchingsaid member when operated, a main shaft,.acam on saidmain shaft controlling .saidlatch ateveryrevolution to move out of latching position subsequentto the operation of said contact controlling member, and a motor controlling ,device operable under control of said contact.

12., Ina motor control system, atypebar, a striker associatedwithsaid type-bar, a contact controlling member adaptedto be, engaged by said striker, a. latch for restraining said contact controlling member, a main operating shaft,=a first cam thereon for operating said typerbar,

and a second cam thereon. for subsequently dis engaging said latch from. said contact. controlling member.

13. In a motor trical contact, .a .contactf controlling member adapted to be operatedby. said. striker alatch for restraining said contact controlling member in operated position, a. mainoperating shaft, ,a

i-ng saidfsecond member in operated position, a

main operating shaft, a ii.rat.;cam thereon for operating said type bar, and a; secondcam thereon for subsequently disengagingsaid latch, from saidm'emben;

15. 1:! a motor control =system a shift1rame,

"controlsystem, a, bar,a striker associated with said type bar, an elec:

a contact operable thereby, a printing member, a contact operable thereby, a motor control circuit containing said contacts, a latch for said second contact, and delay means for operating said latch to unlatch said second contact.

16. In a motor control system, a shift frame, a contact operable thereby, a printing member, a contact operable thereby, a circuit containing said contacts, a latch for restraining said second contact, delay means for operating said latch to release said second contact,'and a motor control device controlled by said circuit.

17. In a motor control system, a shift frame, a contact operable thereby, a printing member, a contact operable thereby, a motor control circuit containing said contacts, a latch for said second contact, and mechanically operated cyclic delay means for operating said latch to unlatch said second contact.

18. In a motor control system, a shift frame, a first contact controlled by said shift frame, a printing mechanism, a second contact controlled by said printing mechanism, a motor control circuit containing said first and said second contacts and closable by said contacts jointly, and a mechanical latch prolonging the interval of closure of said circuit.

19. In a motor control system, a shift frame, a first contact controlled by said shift frame, a code-signal selecting mechanism, a second contact controlled by said mechanism, a motor control circuit containing said first and said second contacts and closable by said contacts jointly, a, mechanical latch prolonging the interval of closureof said circuit, and cyclic means for unlatching said latch.

20. In a motor control system, a motor, a plurality of devices operable sequentially to stop said motor, means momentarily operable for shifting one of said devices to its operated posi- 1 tion, and further means operating in every power cycle for continuing the period during which said device occupies its operated position and for releasing said latched device at the end of the power cycle.

21. In a motor control system, a motor, a plurality of devices operable sequentially to stop said motor, means momentarily operable for shifting one of said devices to its operated position, means for continuing the period during which said device occupies its operated position, and further means operable within the same cycle of selective operations for releasing said device.

22. In a motor control system, a motor, a plurality of devices operable sequentially to stop said motor, selective means momentarily operable for shifting one of said devices to its operated position, a mechanical latch for continuing the period during which said device occupies its operated position, and further means for releasing said latch within the same selective cycle.

23. In a motor control system, a motor, a plurality of devices operable sequentially to stop said motor, selective means momentarily operable for shifting one of said devices to its operated position, a latch for said device, and further means operable within the same selective cycle of operations for unlatching said device.

HOWARD L. KRUM. ALBERT H. REIBER.,-

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