US2672501A - Motor control device for telegraphy - Google Patents

Description

March 16, 1954 c w N 2,672,501

MOTOR CONTROL DEVICE FOR TELEGRAPHY Filed Dec. 5, 1950 4 24 :/E u /IA IIIIIIIIIIIMIIAIIIYIA-J' .1

INVENTOR CARL W. SWAN Patented Mar. 16, 1954 MOTOR"CONTROL DEVICE FOR TELEGRAPHY .T Carl-W.1;Swan, IfSkokie, 111., ,assignor to Teletype Corporation, @Chicago, 111., a corporation of .,Delaware .mm licationi December 5, 1950,, Seria1-N.o..1-99,'28,0

"Claims. .1

rThe; present invention relates toremote .control systems andapparatus and more; particularly to automatic motor stop mechanisms.

. :The; system'of the present inventionis particu larly-adaptedto telegraph .lines having unattended-stations. .Insuch isolated lines itis desirable to-stop the motors automatically when no; signals .are received fora predetermined period andtostart themotors-upon resumptionof signal transmission.

.aItI-is thereforeithe principal objectof the present-.inventionito; provide a simplified motor control 'aarrangement which can be'embodied in an .a paratus for the transmission of intelligence suchthat when-there.isnotrafiic on the signal inecoinciidence with .-:each .1 other periodically to 1 efiect the operation. of-ra; contact for controllin armotor circuit.

.rArmoregcomprehens-ive :nnderstanding of ,the invention may :be had from the following descriptiongtakenqimconj unctioniwith :the iaccornpanying :drawi-ngs wherein,

Fig. 1 1.21 anc'elevational z v-iew .:.of .-;.-a preferred :embodimentizofzthermotoracontroldevice according to: the; present:inventiontogether withga .dia-

-Erammatic illustration 1110f; the selectrical .;components :associatedtjtherewith;

feF-i'gz: isian: end wiempffithe rratchet an'dxdisc arrangement of thermotorcontrol:device;;and

:zFig. Badman elevational rview of 8111*:E1t911l5fi6 formeofirmotorgcontrolcdevice.

:"I-Iaving'referenceto Fig. l-zoftzthedrawings; the base-raplate :zof '5 the apparatus :is; indicated-at I I on-iwhichi issmounted-s .a :bracket l 2. :Freely; carnedon-anpivotrstud t3 securedzto, thezbracket l2 arezarpairsiof ratchet wheels Ni and. i1 5. I Integral withr the-iratchet: wheel." M; is: at disc-portion. it, and;integralwwithgthe:ratchet wheel [5 ista disc portion .1. TIIBJKIHSO portions. .116: and :i are .cnntieuousrandaarerzsogamaintained. pmthezsprin ciampingnnstrumentalityislfl. imthepresentrem- (Cl. 178-4i.1)

I2 bodiment of theinvention thespring-clamp this Shown as a three-prongedelement adapted-.110 maintain a frictional relationship hetweemthe ratchet and disc elements.

Operatively related to theteeth of the ratchet Wheels i4 and I5 is a pawl member lfiarticulated to an eccentric drive meansZLrotatably secured to a drive shaft zzrappropriately carriedinthe apparatus. ,Pawl i9 is .provided .at .its freeiextremity with a laterally disposedtooth portion 23 which is adapted to span ,both.v ratchets M .and 5 and to thereby cooperate simultaneouslywith the teeth thereof. ,Pawl memberv I-9.-is..normally biased in acounterclockwise, directionby .spring 24 to maintain thetooth-23 in operative relation to the ratchet teeth. .A .limiting:stop..25 isprovided to insure said operative: relation.

Disc is provided with a single peripheral notch 235 which with-a notch '35 on discdlcoacts with anarm 27 of abell cranklevenifl-mounted pivotally on a pivot studzasecured to the bracket 2. The depending-arm. of hell crank .lever 28 cooperates through suitable openings in. base plate H with the vertical:arm=32.of a bell crank lever '33 mounted pivotally 0n-.a.pivot=stud;.34 appropriately carried in .theapparatus. ,The lever 33 is-also provided with a horizontal armi35. fora purpose to be presently described. .Lever 2B, is normally biased'clockwise :bya springfil).

, Disc 1 i1. is provided .with ,a single peripheral notch 35 which withthe notchlton disc It coacts with an .arm .31 of a pluraharmed lever .38 mounted pivotally on a;,,-pivot studz39 secured to thebracket H2. The :dependingarm-ALot-lever 3:3 extendsthroughv a suitable opening in base H and is provided 1 with. a lateral projection. adapted to cooperateendwise-with the extremity of; arm 35 .ofleverifl. vAttached tozthe free end of lever arm-4i is one; end 016-18, springallt, the-other end of whichis, secured-to-ia projectionA Lon lever 3 5. Spring 53 thustends .to impart clockwise rotation to lever 33 and counterclockwise. rotation to lever 38, as well as to maintain projection 2 and arm 35 in endwise contactualengagement under certain operating. conditions hereinafter described. The vertical arm 45 of lever. 38 is adapted to cooperate with a bail member carried on a rock shaft 41 appropriately positioned in the apparatus. Theshaftil-is analogous-to the shaft 31! shown-in,Fig..15 of U. Se Patent No. 2,505,729.

"ihe surfer-seat ofr-leverte cooperates with the plunger t8 oi a--srx itchiei secured to base plate ii. .switch tiwcontrolsa cireui 'iexisending from pn'sit-ive battery; sourcez throiigheswiteh 1-5 1 mover conductor 52, through the winding of magnet 53 to negative battery. Magnet 53 is a part of a control device comparable to the arrangement disclosed in U. S. Patent No. 1,964,268, schematically shown herein. Magnet 53 is provided with an armature 54 which, through a pair of plunger type links 55 and 58, controls a pair of contacts 51 and 58, respectively. Contacts 51 are included in the circuit of a motor 59, and contacts 58 are included in the line circuit. The line circuit extends over conductors 81 through a line magnet 82, which is shunted when the contacts 58 are closed.

As was previously mentioned, the pair of ratchets l4 and 15 are provided with different numbers of teeth; for example, in the present embodiment of the invention, one ratchet is provided with thirty teeth and the other ratchet is provided with thirty-one teeth, so that indices on .the ratchets, such as the notches 28 and 38 on the discs l8 and I1 will coincide every 838 turns (30 X 31) of the main shaft 22. As indicated in Fig. 2 the arms 21 and 31 span both of the discs I8 and [1. Thus in the course of the stepping movements of the two ratchet wheels l4 and I by pawl 13, the notches 28 and 38 will coincide periodically to permit the end of arm 21 to fall therein due to the action of spring 30 upon the lever 28, whereupon lever 28 will be rotated clockwise a predetermined amount to impart counterclockwise rotation to lever 33 to disengage arm 35 from projection 42. thus permitting spring 43 to bias the lever 38 counterclockwise to bring the end of arm 31 of lever 38 into engagement with the peripheries of discs 18 and I1. Then after a predetermined interval the notches 28 and 38 will again coincide, but this time over the 'end of arm 31 to permit the end of arm 31 to fall therein to permit additional ,counterclockwise movement of lever 38 whereupon surface 48 of lever 38 will press the plunger 49 of switch 5| to eifect the closing of said switch to complete the circuit for magnet 53 which will become energized and will pull up or attract its armature 54. If, during the rotation of the ratchets l4 and I5, and hence the discs l8 and I1, the bail 48 is oscillated between the full line and dotted line positions, the lever 38 will be rotated clockwise to cause the projection 42 to swing clear of the arm 35 of lever 33 to permit the end of arm 35 to again block counterclockwise movement of lever 38 and to hold the end of arm 31 free of the peripheries of discs l6 and I1 as shown in Fig. 1.

In the operation of the motor control device shown in Fig. 1, it is assumed that the circuit for motor 59 is closed at contacts 51 and hence the motor of the telegraph apparatus is running and that, therefore, the main shaft 22 is rotating. The main shaft 22 in rotating, thus causes the pawl 13 to be reciprocated to step the ratchets l4 and I5. It is further assumed that there is trafiic on the signal line and accordingly the shaft 41 will be rocked for each operation of the telegraph apparatus in response to signals received. The bail 48 will therefore act upon lever 38 as previously described to maintain the latching relationship between projection 42 and arm 35. Thus, even if during signal reception, the notches 28 and 38 coincide to permit clockwise movement of lever 28 to disengage arm 35 from projection 42, this condition will exist only momentarily because the shaft 41 is still rocking and hence bail 48 is acting cyclically upon lever 38 to reengage the projection 42 and arm 35 as indicated in Fig. 1. Therefore, switch 5| cannot operate to close the circuit for magnet 53.

Now, if traflic on the signal line should cease, then the bail 48 will no longer oscillate, but remain in its solid line position, while the main shaft 22 is still rotating to continue to reciprocate the pawl 13. The ratchet wheels l4 and I5 will continue to be rotated until the notches 28 and 38 coincide to permit lever 28, under the pull of spring 38, to operate lever 33 to disengage arm 35 from projection 42. Now, lever 38 will be actuated counterclockwise by spring 43 to bring arm 31 in contact with the peripheries of discs I8 and I1, but not enough to depress the plunger 49 of switch 5|. Rotation oi. ratchets l4 and I5, and hence discs l8 and I1, will continue until the notches 28 and 38 again coincide to permit the end of arm 31 to fall therein to cause the surface 48 of lever 38to press against the plunger 48 sufllciently to operate the switch 5|, to close the circuit formagnet 53.

The magnet 53, upon operating, will pull up its armature 54, and through members 55 and 58 cause contacts 51 and 58 to be opened. The motor 59 will stop running due to the cutting off of the power therefor by the opening of contacts 51. The armature 54 becomes latched inits attracted position by a latch element 83. This is necessary because the shaft 22 does not stop immediately, but only gradually as the motor 53 is'brought to a stop. When the shunt contacts 58 are opened, the magnet 82 will be energized by the line circuit current, which is normally marking in the stop condition. -Magnet 82, when operated will pull up its armature 84 against the pull of its spring 85. A spring 88 normally pulls latch 83 and armature 84 to ward each other, and a projection 81 integral with the armature 84 limits the space between latch 83 and armature 84. When the magnet 53 is energized and the armature 54 is attracted, the contact 58 opens and the magnet 82 is immediately energized and the armature 84 is immediately pulled up, stretching spring 88 and permitting the armature 54 to be held latched by shoulder 88. This condition will persist so long as no signals are received on the signal line, which therefore remains in a marking condition (current on the line). 4

However, as soon as a spacing or no current signal is received, the armature will be released and its spring will actuate it until the projection 81 strikes the latch 83 to raise latch 83 out of latching engagement with the shoulder 88. It must be understoodhowever, that when the deenergization of magnet 82 occurs, the armature 54 is still pulled up, and therefore the end of armature 54 becomes latched up by the shoulder 83 of armature 84. Thus, sumcient clearance is provided for the unlatching of latch 83 from armature 54, and the latchingof armature 54 by shoulder 89 of armature 84 instead. This substitution of latching elements for armature 54 is a precautionary measure in the event the occurrence of a spacing condition is a line break instead of a spacing impulse inherent in signal ing. Thus, if a break in the line circuit should occur after the motor has been stopped as Just described, the motor 59 will not be started accidentally. Then when a marking condition (closed line) again occurs the magnet 82 will be operated and the armature 84 will bepulled up to release armature 54 and cause the closure of con-.

agevepm tacts 51 .and @58 :thereby starting 59 .and shunting the :magnetBZ.

.A modified form =.of :the present invention is shown .in. Fi-g.-.3 in which rthe ratchet gears of .the pair of ratche-t gears 1.1 and 12 .are -.mounted :on independent shafts 13 end :14. .Gear .-1.*.I .is .in mesh with gear '1 z-andmotionais imparted toagear H by a pawl 15 carried on an eccentricidfixed-to .a drive shaft .11.. Aspring 11B normally-biases the pawl 1.5 into engagement with the gear ll. Integral with gear H .is -.a disc :member .19 provided with a peripheral notch 8.-I. A disct82 rovided with a peripheral .notch as .is fixed .to the-gear L2. .In the embodiment shown inFigplt -gear III is provided with thirty-one .teeth andgear $12 provided with thirty. teeth.

.Pivotally mounted :on .a pivot-shaft .814 appropriately positioned on one-side of'discs .19 .and 82 is a plural-armed lever-585. Also,.mounted.pivotall-y on a pivot .shaf-t appropriatelylocated on the .other side of discs 1.9 and 82.isa pluralarmed lever.81. Leverfiiis provided with a leftwardly directed-arm .8.8,-a rightwardly directed arm'89, a depending-arm9l and a vertical'arm 92. Arm 88 of .lever Bliss-adapted tocooperate with the periphery of disc TB-and to-coact with notch 8| .as will presently .appear. Arm M is adapted tocontrol aswitch contact :93, analogous to switch 5| in Fig. .1. Arm 89 is adapted to cooperate with a signal controlled and cyclically operable member fid'comparable to bail 46'. :Ver-' tical arm 92 of lever 85 isprovided with a lateral projection '95 adapted'to cooperatewith the peripheryof disc 82 and to react with the notch 83. Th laterally disposed extremity of arm 92 cooperates with the horizontal :arm 96 0f a bell crank 91 .mounted .pivotally-ronzia pivot 98,1the depending 'arm -95 of which cooperates with an arm IOI of plural-armed .lever 81. Lever :81 also. provided with a rightwardly extending arm IIlZconfronting arm .88 and adapted to cooperate with the periphery of disc 19, and under certain predetermined operating conditions to coact with the notch 8i. Lever 81 is further provided with a vertically directed arm I03 which, in turn, is

provided with a lateral projection I04 confront-.

ing projection 95 and which is adapted to cooperate with the periphery of disc 82 and to coact with the notch 83.

In the operation of the arrangement shown in Fig. 3, the motor (not shown) is assumed to be running to impart rotation to the drive shaft 11 and hence to cause pawl 15 to reciprocate, to thereby impart rotation to ratchet gears H and 12 and to the disc members 19 and 92. During signal reception, the member 94 is reciprocated cyclically, and in so doing causes the lever 85 to oscillate in timed relation therewith. In this condition of operation, the lever 85 is prevented from riding on the peripheries of discs 19 and 82 for any sustained period.

Lever 81, through its projections I02 and I04 always rides on the peripheries of discs 19 and 82. The relation of the gears H and 12, and discs 19 and 82 is such that the lever 81 will be actuated clockwise by its spring I05 when notches 8| and 83 coincide respectively with projections or arms I02 and I84 simultaneously. In the present embodiment such coincidence will occur every 930 turns (30 (31) of the main shaft 11, and permit spring I05 to actuate lever 81 clockwise to cause arm IfiI to rotate the bell crank 91 counterclockwise to unlatch the lever 85. Spring I96 will thus actuate lever 35 counterclockwise to cause arm 88 and projection 95 to rid on their respective 6 discs 11.9 :and 82. =-upon thescontinuedarotationsof gears 1.] land 1.2 byypawl .15 :the arm 4.02 .-.ancl 311E0- jection I04 will be .cammedsout of the respective notches 8| and 8.3 and spring I01 will-attemptito rotate the bellicrank91 clockwise, but this action .is prevented by thefact that arm -96:is resting -.'on .theend ofzarm 92.

.Now, it signals are .still being received, the member .94 will continue .to oscillate andlever 85 .will be again actuated clockwise and :arm .92 thereof will be moved. out ofengagement with the arm 95 of bell crank .91 and .lever 85 williagain be blocked against counterclockwise movement by .sp-ringlsfi until lever 81 is enabled by notches 8] ;and 183 to .unlatch the :arm .92. .However, the -..event the member 94 is quiescent following the unlatchment-cf arm 92 the arm 88 and projectioniiE of lever 85 willcontinue toride-onthe peripheries .of therespective discs 19 and-'82 umtil the notches ill and 33 coincide respectively with said projections or :arms 88 and .95 simultaneously. In this event, the lever 85'will beactuated .further in a counterclockwise direction .to close the contact .93 to complete -a circuit .ior energizing the relay analogous to relay 53 in Fig. 1. Otherwise the circuit associated with-contact 953 is the same as that associated withswitch =51 inFig, 1. If atan time before notches -8I and 83 should coincide with arms or projections 88 and 05, the member as should again operate, ;for example, in responseto signal reception, the arm 92 will again become latched-.upbythe bellcrank lever 91 to await the reinitiation-of the motor stopping cycle.

Although theinventionhas been describedrin connection with certain specific :forms :ther.eof,. .it will be understood that it has further application and that it is not limited rbythe-embodiments shown for illustration.

The invention claimed is:

.1. In combination, a timing mechanism --;comprising a pair of toothed elements having different numbers of teeth, a disc individual to each toothed element and movable therewith, each of said discs having a single peripheral notch, a common actuating member for rotating said toothed elements, whereby a predetermined operative relationship between said notches is periodically recurrent, a first means having facilities for simultaneously sensing said discs for coaction with said notches, a second means having facilities for simultaneously sensing said discs for coaction with said notches, said first means responsive to a positionment of said notches in one or" said operative relationships to condition said second means for operation, and a contact controlled by said second means, whereby said second means is effective in response to a positionment of said notches in another of said operative relationships to operate said contact.

2. In combination, a timing mechanism comprising a pair of toothed elements having different numbers of teeth, a common actuating member for rotating said toothed elements, whereby a predetermined operative relationship between cidence of said notches, said first means respon sive to a first coincidence of said notches to condition said second means for response to a sec- 'ond coincidenceof said notches, a contact, and means responsive to the simultaneous sensing of "said notches by said first and second members sequentially to control said contact.

' 3. In combination, a timing mechanism comprising a pair of toothed elements having different numbers of teeth, a common actuating mem- J her for rotating said toothed elements, whereby a predetermined operative relationship between said toothed elements is periodically recurrent, a disc having a single peripheral notch operably associated with each of said toothed ele- 'ments, a first member having facilities for simultaneously sensing said discs for coaction with said notches, a second member having facilities for simultaneously sensing said discs for coaction with said notches, a latch means for said first'member controlled by said second member in response to the simultaneous sensing thereby of said notches for unlatching said first member, a 'signal controlled cyclically operated member for periodically efiecting the latching of said first member by said latch means, and a contact con-' trolled by said first member, whereby in response to the non-operation of said cyclically operated member said second memberis operated upon a simultaneously sensing of said notches to unlatch said first member which in response to a simultaneous sensing of said notches operates said contact.

4. In combination, a timing mechanism comprising a pair of toothed elements having different numbers of teeth, a disc individual to each toothed element and movable therewith, each of said discs having a single peripheral notch, a common actuating member for rotating said toothed elements, whereby a predetermined operative relationship between said notches is periodically recurrent, a first means having facilities for simultaneously sensing said discs for coaction with said notches, a second means having facilities for simultaneously sensing said discs for coaction with "said notches, said first means re"- sponsive to an alignment of said notches in one of said operative relationships to condition said second means for operation, and a contact controlled by said second means, whereby said sec,- ond means is effective in response to an alignment of said notches in another of said operative relationships to operate said contact.

5. In combination, a timing mechanism comprising a pair of toothed elements having dif ferent numbers of teeth, a common actuating member for rotating said toothed elements, whereby a predetermined operative relationship between said toothed elements is periodically recurrent, a first means having facilities for simultaneously sensing said discs for coaction with said notches, a second means having facilities for simultaneously sensing said discs for coaction with said notches, a latch means operated by said second means in response to one of said operative relationships to control the operation of said first means, a signal controlled cyclically operated means to cyclically reset said latch means, and a contact controlled by said first means, whereby upon a cessation of operation of said signal controlled means said first means is effective in response to another of said operative relationships to operate said contact.

CARL W. SWAN.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 924,616 Kettering June 8, 1909 1,688,711 Hewitt et a1 Oct. 23, 1928 2,102,070 Harris Dec. 14, 1937 2,290,626 Bosomworth July 21, 1942 12,386,009 smith Oct. 2, 1945 2,522,461 Potts Sept. 12, 1950 2,531,528 Potts Nov. 28, 1950 i MA

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