US1703152A - Selective system and apparatus - Google Patents

Description

Feb. 26, 1929.

E. E. KLEINSCHMIDT SELECTIVE SYSTEM AND APPARATUS Original Filed Dec. 21. 1922 4 5heets-$heet gww'ntor Feb. 26, 1929.. 1,703,152

E. E. KLEINSCHMIDT SELECTIVE SYS'IEM- AND APPARATUS 7 Original Filed Dec. 21. 9 '4 Sheets-Sheo 2 Feb. 26, 1929.

' 1,703,152 E. E. KLEINSCHMlDT SELECTIVE SYSTEM AND APPARATUS Origina l Filed Dec. 21. 1922 sheetysheet s Feb. 26, 1929. Q 1,703,152

v E. E. KLEINSCHMIDT SELECTIVE SYSTEM AND APPARATUS Original Filed Dec: 21,-: 1922 4 s t s t 4 W 6. LAW, mm mm dra at Patented Feb. 1929.

nnwnnn E. KLEINSCHMIDT, or eni ma; ILLINOIS,

ASSIGNOR, BY MESNE ASSIGN- MENTS, TO MORKRUM KLEINSCHMIDT CORPORATION, OF CHICAGO, ILLINOIS, A

CORPORATION or DELAWARE.

SELECTIVE SYSTEM AND APPARATUS.

Application filed December 21, 1922, Serial No. 608,341. Renewed May 5, 1928.

This invention relates to a system and apparatus for selectively controlling various operations from distant points, for example -control of remote motors, switching appara 6 tus and mechanical operations. It is particularly useful in the transmission of intelligence and in the preferred embodiment herein disclosed the invention is illustrated.

in its application to a printing telegraph 10 system.

In selective systems of the kind referred to, where a plurality of distant operations must be controlled,transmitting and receiving apparatus are essential. Where the numher of operations to be performed is greater than the number of channels for transmission of energy, as for example, where only one line wire is used in a printing telegraph system such as shown, a definitely timed relation of operation must be established between the transmitters and receivers. It will of course be understood by those skilled in the art, that theinventionis not limited to use with a single line wire. A plurality of line wires may be used with the invention in its broader aspects, or the invention may obviously be adapted to signaling over single Morse channels of a multiplex system, or over a single carrier telegraph channel and it is applicable to the usual wireless or radio signalling systems.

Systems maintaining a substantially synchronous relation between distant apparatus are well known in the art. A particular,

class of such systems rely on operating the apparatus in definite cycles to maintain the necessary timed relation. Each cycle of operation comprises a starting of the apparatus at the beginning of the cycle, the performance of a series of operations, and the stopping of the apparatus at the end of the cycle. In the telegraph 'art such systems have become known as start-stop systems.

The present invention is described and shown in its application to a system and apparatus of the start-stop type.

In the start-stop systems of the prior art, it has been the practice to operate the transmitting and receiving apparatus at slightly different speeds. This has been found necessary due to impossibility of avoiding slight variations in driving speed, and to enable proper correction to be made. Two generaltypes of driving means have been used; the

usual motor drive timed to run at definite speeds in various manners; and stepping devices interrupting local direct current cir cuits. The Cardwell start-stop system and the grasshopper distributor systems are examples of the latter type. The usual motor driver systems are cumbersome, expensive and diflicult to regulate. Ordinary stepping systems vary with changes in potential condition of contacts, and numerous other conditions and are therefore impractical. It is obvious that when the speeds of transmitter and receiver change more than a relatively slight degree, the operativeness of the system is completely destroyed until the speeds are readjusted. With transmitter and receiver at distant stations, the readjustment presents serious difficulties and results in annoyance and loss of time.

An object of the present invention is, to provide a system in which cumbersome and expensive motors are eliminated, and in which variations in speed potentials, contacts, and other local conditions are minimized. Another object is the provision of a simple system in' Which the transmitter and receiver are driven at substantially equal speeds, and in which no attention need be given to speed regulation. A further object is the production of a more eflicient, reliable, less cumbersome and cheaper apparatus.

In general these objects are attained by utilizing ordinary locally generated commercial sources of alternating current to drivethe transmitters and receivers in definitely timed relation with respect to the" frequencies of such sources. The potentials and frequencies of such sources .are standardized and closely regulated. All communities large enouglnto require telegraph service have such sources of alternatingeurrent for lighting and power purposes. The speed of operation of the apparatus in the present system is timed by these local sources and advantage is thereby derived from the close regulation customary on such owersystems. For the details of the pre'ferred form of invention, reference may be had to the following description and to the accompanying drawing of which Fig. 1 is a plan view showing the essential elements of the transmitter.

Fig. 2 is a front elevation of the transmitter with parts broken'away to show the driving means.

Fig. 3 is a plan elevation showing essential elements of the receiver and control of an operating magnet.

Fig. 4 is an end elevation of the receiver with parts broken away to show the driving means and control of a selector mechanism. Fig. 5 is a plan view of a modified form of receiver and driving means therefor.

Fig. 6 is an end elevation of the modified form with parts broken away. to show the driving means and cont-r01 of the selector.

Fig. 7 isa diagram showing a system wherein the invention is applied to a plurality of receivers and transmitters in the same circuit.

Transmitting apparatus.

Referring to Figure l, numerals 1 to 6 denote a plurality of transversely movable permutation bars each bearing a plurality of cam surfaces 7. A plurality ofletter or signal bars 8 are mounted to co-act with the cam surfaces on bars 1 to'6, so that when the bars 8 are depressed, bars 1 to 6 are moved transversely in various combinations in accordance with a predetermined code as is well known in the art. Bar 6 is a. universal bar and is moved transversely by the depression of each key or signal bar 8. As

bar 6 moves transversely to the left on depression of a. key, it engages pawl 9. Pawl 9 is moved forward by 6 and actuates bell crank 10, upon which 9-is pivotally mounted at 11. Bell crank 10 moves about its pivoted point 12 and closes contacts 13. As pawl 9 is moved to the left its cam surface 14 rides on fixed pin 15 and stresses spring 16. After contacts 13 have been closed the cam action of pin 15 on surface 14 moves pawl 9 about point 11 to release the pawl from actuating engagement with bar 6. In this manner, if a key is held depressed after the selective combination controlled thereby has been sent, contacts 13 will be free to open and a second character will not be'sent.

When the key is released pawl 9 and bell laminated soft iron core 19.

Wound upon the legs 20 and 21 of core 19.0

crank 10 will be returned to normal position under influence of the contact spring. and spring 16. The usual keyboard interlock (not shown) may be provided to guard against release of a depressed key before the combination has been completely transmitted.

Closure of contacts 13 completes an energizing circuit from a locally generated source of alternating current, to cells 17 of a timed alternating current magnet. This magnet comprises a permanent horseshoe magnet 18, to one leg of which is secured a U-shaped Coils 17 are Pivoted at 22 to the other leg of permanent magnet 18 is a soft iron armature 23.

When contacts 13 are open, a normal magnetic field is set up by 18, through core 19 and armature 20, tending to retain 20 in the position shown in Fig. 2. Legs 20 and 21 are cut at an angle and insure sticking of the armature 23 in either of its biased positions. \Vhen contacts 13 are closed, reversals of current supplied to coils 17 alternately strengthen and weaken the normal magnetic field at legs 2O and 21, thereby causing oscillation of armature 23 about pivot 22 in unison with the reversals of the current supplied by the load alternating current source. Pivotally mounted on 23 is a forked double acting pawl member 25. As the-lower end of 23 moves to the right in i Fig. 2, the upper branch of 25 pushes on a teeth of driving wheel 26 and the lower branch of 25 is moved from engagement with one tooth and rides over the next tooth on 26. On the return movement of 23, the

lower branch of 25 pulls on the tooth it has ridden over, and the'upper branch moves away from the tooth it pushed and rides over the next tooth. In this manner it will be apparent that wheel 26 is rotated in definite timed relation with respect to the reversals of alternating current. This timed relation may of course be varied as it depends on the throw of pawl 25 and the number of teeth and size of toothed wheel These are varied to adapt the transmitter to the particular local conditions and speed requirements. It will therefore be obvious that two stations on the same system need not necessarily have the same frequency of alternating current supply. Forexample a transmitter on 60 cycle supply may be driven to send impulses at the same rate as a trans- -mitter on a 25 cycle supply. For the sake of uniformity in apparatus, the same frequency of alternating current at differentstations is to be preferred.

Mounted in bearings, or supports (not shown) so as to be rotatably and axially movable, is a pin barrel 27. T oothedwhecl 26 is rigidly fastened to, and rotates, barrel 27. Mounted on barrel 2? in angularly and axially displaced relation to each is a series of pins 28 to 34. Barrel 2'? is normally held in retracted axial position by a contact member 35 through the action of spring 36. Line contacts 37 are normally closed with 27 in retracted position. In normal resting position of the pin barrel, pin 28 engages a latch member 38 and prevents locking of contacts 13.

\Vhen as above described, contacts 13 have been closed by actuation of bar 6, armature 23 commences to vibrate in unison with the alternating current reversals and retates the pin barrel, on the first step, 28 moves out of engagement with 38- which then locks contacts in closed position. Pin 29 then engages a fixed cam member 39. This causes axial movement of the pin barrel and thereby opens contacts 37 causing a preliminary or start condition on the line. After 29 has passed cam 39, barrel 27 is axially restored through action of spring 36, and contacts 37 are again closed. The pin barrel continues to rotate and pins 30 .to 34 successively pass by cam members to 44 carried by bars 1 to 5. As shownin Fig. 1, bars 2, 4 and 5 are actuated and'in this condition interpose cams 41, 43 and 44 respectively in the paths of pins 31, 33 and 34. As each pin passes a corresponding actuated bar (1 to 5) an axial movement of the pin barrel will be caused, actuating con tacts 37 to send code combinations of mark ing and spacing conditions on the line or transmitting medium. It 'will be obvious that the relative times occupied'by marking, spacing start, and stop condition may be varied at will by increasing or decreasing the width of cams 39 to 44 and varying proportions to suit varying line conditions. Block signals or separated interval signals may obviously be sent depending on proportions of the parts. Reversed polarity impulses may also be used if desired, in obvious manner. .After the last impulse of a combination has been sent contacts 37 remain closed, and the pin barrel rotates under control of the local alternating current source until pin 28 engages latch 38 and releases contacts 13. Even if the key is held depressed contacts 13 will open, rotation of the pin barrel will stop, and the key must be released to permit re-engagement of bar 6 and pawl 9 before another code combination can be sent. It will of course be understood that the parts are shown in sche matic form and distorted relation to better illustrate the inventiqn. For the sake of clcarness supports have been omitted and only so much of well known apparatus has been illustrated as is required to clearly show the invention.

Receiving apparatus.

In the preferred embodiment of receiving apparatus shown in Figs. 3 and 4, a motor of the-same type has been shown as is used in the transmitter. This need therefore not be here described, but for convenience the same numerals with 100 added thereto have been used to designate like parts. The local alternating current source need notbe of the same frequency as that at the transmitter, as above pointed out, but this is preferable.

Incoming code combinations of electrical impulses operate line magnet 150 to actuate armature 152 about a pivotal point, un-

der influence of spring 153, in obvious mansimilar to that shown in Figs. 3 and 4.

ner. Movement of 152 (as shown in Fig. 3) caused by a starting line condition, permits pinbarrel 154 to move axially to the right under influence of member 155 and spring 156, movingpin 157.and permitting contacts 113 to close the local alternating current circuit. Pin barrel 154 then rotates under the influence of the local alternating current source in definitely timed relation with respect to the change of line conditions caused by the-transmitter. As the barrel rotates, pins 158- to 162 successively pass trips 163 to 167. If a marking condition exists on the line as a pin passes its trip, axial movement of the pin barrel will be permitted by'150 and the respective pin is caused to align with and actuate its respective trip. It a spacingv condition exists onthe line as a pin passes the trip, no axial movement of the barrel will be permitted and the trip will be unactuated. The rotation of the pin barrel 154 is so timed that bars 1 to 5 (Fig. 1) of the transmitter will cause marking or spacing conditions which control the actuation of trips 163 to 167 re-;

spectively. 'VVith bars ,2, 4 and 5 actuated, trips 164, 166 and 167'will be set. As trips 163 to 167 areset latches 1.68 individual to each trip operate to retain the set trips in actuated position.- Trips 163 to 167 control' a plurality of the movable slotted selector bars 169. The selector bars 169 control a plurality of actuating bars 170"which in turn control the desired selective operation. A selector of this type is fully disclosed in copending application Serial Number 588,668, filed September 16, 1922, to which reference may be had for details of the selector and mechanism controlled thereby. Only so much at the selector mechanism is here shown as will enable a complete understanding of the invention to be had in its specific application to the selector disclosed in Serial Number 588,668. It should, however, be

understood, that the present invention is usecase, bars 170 would actuate the type-bars,

and magnet 172 would be the printer magnet.

Figs. 5 and 6 illustrate a modified form of driving means for a receiving apparatus It will be unnecessary to describe in detail the operation and only so much as has been modified will be deseribed- Selectivecode eoi'nbinations cause the closure of contacts .on member 282 is spring pressed pawl 285,

which as 28?. rotates, operates on ratchet wheellSti to wind spring 278. pawl 28? prevents release of .278 on de-ener-j gization of 272. In thismanner energy is stored in spring 278 on each operationot magnet 272, to etlect the succeeding rotation oi pin barrel 255i. Parts similar to those shown in Figs. 3 and at are indicated by the same numerals with 100 added thereto.

The system.

A system disclosing a plurality of transmitters and. receivers on a single circuit is disclrsed in Fig. 7. It will be apparent thatthe sole timing means is the regulation attorderlby commercial alternating. current sources local to the apparatus. Apparatus is dri en at substantially equal speeds .all along the line. ceivers are not adapted for general use with common apparatus of the prior art owing to the method of timing. The invention must be applied to prior art apparatus before they can be used in the system. Receivers and trasmitters herein disclosed are therefore peculiar to the system.

Plainly the inventions arenot limited to the specific embodiments shown and described he in, but are to be limited only by the tollok. i g claims.

\Vhat is claim d is:

1. In a selective system including transmitting apparatus adapted to transmit .code

combinations of electrical impulses, and recciving apparatus selectively controlled by said impulses; the method of maintaining a fixed time relation between said apparatus which consists in utilizing alternating current sources local to said apparatus as the sole speed regulating means for said apparatus.

2. In a. selective system, transmitting apparatus operable to transmit selective combinations of electrical impulses, sources of alternating current local to said transmitting apparatus constituting the sole speed regulating agencies for said transmitting appa- Driving energy is sup- Retaining The transmitters and re-.

tit/03,152

ratus, receiving apparatus controlled by said transmitting apparatus, and sources of alternating current local to said receiving apparatus constituting the sole speed regulating agencies for maintaining said receiving apparatus in fixed time relation of operation with respect to said transmitting apparatus. f

In a selective system, plurality of transmitters adaptedto transmit selective combinations of electrical impulses; sources of alteri'iating' current individual to said transmitters c onstituting the "sole agencies for timing the speed of transmission of said impulses; a plurality of receivers responsive tosaid impulses and sources or alternating current individual to said receivers constituting the sole speed regulating agencies tor timing the speed of operation of said recelvers. I

4. Ina selective system, a plurality of transmitting stations; transmitting apparatus at said transmitting stations adapted to transmit selective combinations of electrical impulses; sources of alternating currentlocal to-said stations constituting the sole agencies for timing the speed of operation of said transmitting apparatus, a plurality of receiving stations; receiving apparatus at said receiving stations controlled by said transmitted impulses, and sources of alternating current local to said receiving stations constituting the sole agencies for timing the speed of operation of said receiving apparatus. I

5. In a selective signalling system, aplu; rality oi transmitting stations; transmitters individual to said transmitting stations embodying distributors of electrical impulses, sources of alternating current local to said stations constituting the sole agencies for. regulating the speed of operation of said transmitters; a plurality of receiving stations; receivers individual .to said receiving stations embodying distributors operable in separate cycles to receive said impulses; and sources of alternating current local to said receiving stations constituting the sole agencies for regulating the speed of operation of said distributors.

6. In a selective signalling system, a plurality of transmitting stations; transmitting been transmitted; sources of alternating current local to said transmitting stations constituting the sole agency for timing the speed of rotation of said distributors; a plurality of receiving stations; receiving apparatus at saidreceiving stations, said receiving apparatus embodying a plurality of rotary distributors started into rotation to receive said impulses and arrested in rotation at the end of each revolution. after said selective' combination has been received; and sources of alternating current local to said receiving stations constituting the sole agencies for timing the speedof rotation of said receiving distributors;

. 7 In a selective signalling system, amovable distributor; and a' source of alternating current controlling said distributor and controlled by said distributor, the frequency of said alternating current being timed independently of said distributor.

8. In a selective signalling system, a rotary distributor; and a source of alternating current controlling said distributor and controlled by said distributor, the frequency of said alternating current being timed independently of said distributor.

9. In a selective signalling system, a distributor movable in cycles, a source of alternating current timed in frequency independently of said distributor; and electro-responsive means actuated by current supplied by said source and causing said distrlbutorto 'be'rotated in fixed time relation with respect torever'sals of said current.

10. In a selective system, a rotary distributor; -a source of alternating current timed in frequency independently of said distributor; and electro-responsive means energized by reversals of current supplied by said source and. driving said distributor in fixed time relation with respect to said reversals of current. a

11. In a selective signalling system, a distributor movable in cycles, and arrested in motion at'the end of each cycle; an independently timed local source of alternating current; and electro-re'sponsive means actuated by current supplied by said source and causing said distributor to be rotated in fixed time relation with respect to reversals of said current.

12. In a selective system, a rotary distributor; arrested in motionat the endof" tributor for maintaining said contacts closed until a revolution has been completed by.

said distributor, thereby causing said distributor to bearrested in motion at the end of said revolution.

14. In a selective system, a selector mechanism, a movable member co-acting with said selector mechanism to cause selected operations to be performed; and an alternating current motor actuated by a local independently timed alternating current controlling said movable member, said motor comprising an oscillating member, a plu rality of coils, controlling said oscillating member, and a normally magnetized core for said coils.

15. In a selective system, a selector mechanism, a rotary distributor co-acting with said selector mechanism to cause selected operations to be performed; and an alterhating current motor actuated by a local independently timed alternating current driving saiddistributor; said motor comprising a normally magnetized core, a plurality of coils.carr1ed. by said core, and

an oscillating pawl carrying member controlled by said coils and rotating said distributor. I s

16, In a selective signalling system, a receiving apparatus selectively controlled by incoming selective combinations of electrical impulses, and a source of alternating current local to said receiving ap aratus constituting the sole agency for timing the speed of operation of said apparatus with respect to said incoming impulses. 17. In a selective signalling system, a receivingapparatus controlled by incoming selective combinations of electrical impulses; said-receiving apparatus embodying a dis-v alternating current local to said receiving apparatus constituting the sole agenc for timing the speed of operation of sai distributor with relation to said incoming impulses.

18. In a selective signalling system, a receiving apparatus controlled by incoming selective combinations of electrical impulses, said receiving apparatus embodying a rotary distributor started into rotation to receive said impulses, and. arrested in rotation at the end of each revolution after a selective combination has been received; and a source of alternating current local to said receiviipg apparatus constituting the sole agency for timing the speed of rotation of said distributor.

. 19. In a selective system,.a selecting mechanism, a rotary distributor, an alternating pendently of said distributor, means responsive to incoming code combinations of electrical impulses co-acting with said distributor to control said selector mechanism, and means responsive to said alternating current source controlling said distributor ,tributor operable ,in cycles; and a source of current source. controlled by said rotary distributor and timed in frequency inde-- unison with revers to maintain a definite timed relation of movement of said distributor with respect to said incoming impulses.

20. In a selective system, a movable dis tributor; electro-responsive means controlled by incoming code combinations of electrical impulses and ,controlling said distributor; a source of alternating current controlled by said distributor and timed in frequency independently .of said distributor; and means responsive to said source for maintaining movement of said distributor in fixed timed relation with respect to said incoming impulses. I i

21. In a selective system, a rotary distributor; electro-responsive means controlled by incoming code combinations of electrical impulses and controlling said distributor; a source of alternating currenflcont-rolled by said distributor and timed in. frequency independently ofsaid distributor; and

means responsive to said source for maintaining movement of said distributor in fixed timed relation with respect to said incoming impulses.

22. In a selective system, a distributor movable in cycles; electro-responsive means controlled by incoming code combinations of electrical impulses initiating a cycle of movement of said distributor; a source of alternating current controlling the cyclic movement of said distributor in .deiinitc timed relation with said incoming impulses; and means controlled by said distributor and controlling said source to arrest movement of said distributorat the end of acycle.

23. In a selective system, a rotary distributor movable in cycles; electro-responsive meanscontrolled by incoming code combinations of electrical impulses initiating a cycle ofv movement of said distributor; a source of alternating current controlling the cyclic movement of said distributor in definite timed relation with said incoming impulses; tributor and controlling said source to arrest movement of said distributor at the end of a cycle.

24. In a selective system, a rotary distributor movable in cycles; .electro-responsive means controlled by incoming code combinations of electrical impulses initiating acycle of movementotand controlling said distributor; a sourceof; alternatlng cur- .rent; electro-responsive, means vibrating in als of current generated,

by said source maintaining cyclic movement of said distributor in timed relation with respect to said impulses; and means controlled by said distributor controlling said source to arrest movement of said distributor at the end of a cycle.

25. In a selective system, a rotary distributor movable in cycles; a magnet controlled by incoming code combinations of ment of and controlling said distributor; a

and means controlled by said dis respect to said impulses; and contact mechanism actuated by said distributor and controlling said source to arrest movement of said distributor at the end of a cycle.

26. In a selective system, a distributor movable in cycles; electro-responsive means controlled by incoming code combinations of electrical impulses initiating a cycle of move source of alternating current; electro-responsive means actuated by reversals of current generated by said source; a stepping mechanism actuated by said last mentioned means and controlling movement of said distributor in fixed timed relation with respeot to said incoming impulses; and a contact mechanism actuated by said distributor and controlling said last mentioned ,means to arrest movement of said distributor at the end of a cycle.

27. In selective system, a rotary distributor movable in cycles; electro-responsive meanscontrolled by incoming code combinations of electrical impulses initiating a cycle of movement of and controlling said distributor; a source of alternating current; electro-responsive means actuated by reversals of current generated by said source; a stepping mechanism actuated by said last mentioned means and actuating movement of said distributor in fixed timedrelation with respect to said incoming impulses; and a contact mechanism actuated by said'distributor and controlling said last mentioned means to arrest movement of-said distributor at the end of a cycle.

28, In a selective system, a selecting mechanism, a movable distributor controlling said selecting mechanism, actuating means for said distributor, and means responsive to code combinations of electrical impulses coactingwith said distributor to control said selecting mechanism; said actuating means being under control of movement in one direction of said distributor, and said selecting mechanism being under control of movement'in another direction of said distributor.

. 29. Ina selective system, a 'rotatry and axially movable distributor; means responsive to code combinations of electrical impulses controlling said distributor; means controlling'rotation of said distributor and controlled by axial movement thereof; and

selecting mechanism controlled by rotary I movement of said'distributor.

30. In a selective system, a rotary and ax- I ially movable distributor; means responsiveto code combinations of electrical impulses sponsive means actuated in fixed timed relation with respect to sald incoming lmpulses controlling said distributor; actuating means adapted to rotate said distributor and controlled by axial movement thereof; and selecting mechanism controlled by rotary movement of said distributor.

31. In a selective system, a rotary and axially movable distributor; means responsive to incoming code combinations of elec trical impulses controlling said distributor; a source of-alternating current; electroresponsive means actuated in fixed timed relation Withrespect to said incoming impulses by reversal ,of' current generated by said source; a stepping mechanism actuated by trolled by combined axial and rotary move-.

ment of said distributor.

Y 34. In 'a selective system, a rotary and axially movable distributor; means respon sive to incoming code combinations of electrical impulses controlling said distributor; a source of alternating current; electro-reby reversal of. current generated by said source; a'steppmg mechanism actuated by said electro-responsive means rotating sald distributor; and a contact mechanism con trolled by axial movement of said distributor and controlling said source: I 35. In a selective system, a movable distributor; means responsive to incoming code combinations of electrical impulses controlling said distributor; a source of alternating current local to said distributor; an electromagnet including a permanently magnetized core and controlled by reversals of current derived from said'source; an armature for said electro-magnet vibrating in timed relation With said current reversals; and a stepping mechanism actuated by said armature to actuate said distributor-in timed relation with respect to'said incoming impulses.

36. In a selective system, a movable distributor; means responsive to incoming code pulses; and a contact .mechanism controlling said source ac tuated by'said' distributor.

37. In a selective system, a movable distributor; means responsive to incoming code combinations of electrical impulses controlling said distributor; a source of alternating current local to said distributor; an electromagnet actuated by current reversals generated by said source; an armature for said electro-magnet vibrating in timed relation with-said current reversals; a double acting pawl controlled by said armature; and a ratchet-member stepped by said pawl on each movement of said armature to step said distributor.

38. In a selective system, a rotary distributor; means responsive to incoming code combinations of electrical impulses controling'said distributor; a sourceof alternating current local to said distributor; an electromagnet actuated by current reversals generated by said source; an armature for said electro-mag net vibrating in timed relation with said current, reversals; a double acting pawl controlled by said armature; a ratchet member stepped by said pawlon each movement of said armature to rotate said distributor in definite timed relation with respect to said impulses; and a contact mechanism controlling said source actuated by said distributor.

39. In a printing telegraph system, a movable distributor; electroresponsive means controlled by incomingcode combinations of electrical impulses controlling said distributor; selecting mechanism controlled by said distributor; printing mechanism'controlled by said selecting mechanism; a source of alternating current controlled by said distributor; means responsive to said source of alternating current maintaining a definite timed relation of movement of said distributor with respect to said impulses; and. operating means for said printing means controlled by said distributor.

40. In a printing telegraph system, a rotary distributor; electro-responsive means controlled by incoming code combinations of electrical impulses controlling said distributor; selecting mechanism controlled by said distributor; rinting mechanism controlled by said selecting mechanism; a course of alternating current controlled by said distributor; means responsive to said source of alternating current maintaining a definite timed relation of movement of said distributor With respect to said impulses; and op- I erating means for said printing means controlled by said-distributor.

41. In a printing'telegraph system, a dis tributor movable in cycles; electro-responsive means controlled by incoming code com binations of electrical impulses initiating a cycle of'said distributor; a source of alter.- nating current controlling the cyclic movement of said distributor in fixed timed relation with respect'to said incoming impulses;

,a selecting mechanism controlled by said distributor; a printing mechanism controlled by said selecting mechanism; operating means for said printing mechanism -controlled by said distributor; and means controlled by said distributor controlling said source to arrest movement of said distributor at the end of a cycle.

42. In a printing telegraph system, a rotary distributor movable in cycles; electroresponsive means controlled by incoming code combinations of electrical impulses initiating a cycle of said distributor; a source of alternating current controlling the cyclic movement of said distributor infixed timed 1 trolled by said .controlled by code combinations of electrical impulses to initiate a revolution of said distributor and controlling said selecting mechanismto select a character; a source of alternating current; electro-responsive means vibrating in unison with reversals of current generated by said source to drive said distributor in definite timed relation to said impulses received by said first mentioned electro-responsive means; means controlled by said distributor to operate said printing mechanism, and means controlled by said distributor controllingsaid source to arrest movement of said distributor at the.

end of a revolution.

44.. In a selective system, electro-magnetic means responsive to incoming combinations of electrical impulses; a movable distributor started in operation by said electro-magnetic means and continuing in definite timed operation with respect to said incoming impulses under control of an independent source of alternating current local to said distributor, and means controlled by said distributor to stop operation thereof when a complete combination of impulses has been received.

45. In a printing telegraph receiver, a distributor, a tension spring for supplying energy to rotate said distributor and'means for maintaining the tension of said spring between predetermined values. p

46. In a printing telegraph receiver, a rotating shaft, a tension springfor supplying energy to rotate said shaft, and means including a second spring for maintaining the tension of said spring between pre-determined values.

47. In a printing telegraph receiver, a rotatable shaft axially operable in response to a received code combination of impulses, a

tension spring for supplying energy to rotate said shaft, an eleetro-magnetic means, and means including a second spring con trolled by said electro-magnetic means for maintaining the tension of said spring between pre-determined values.

48. In a printing telegraph receiver, a rotatable shaft, axially operable in response to received code combinations of impulses, a

tension springfo'r supplying energy to ro-.

tate said shaft, an electro-magnet, a mechanical connection between said spring and said electro-magnet, and a second spring controlled .by said magnet for operating said mechanical connection whereby energy is transmitted to said first mentioned spring.

49. In a printing telegraph receiver, arotatable shaft axially operable in response to a received code combination of-inipulses, a tension spring for supplying energy to rotate said shaft, an electro-magnet and a second spring for supplying energy to said first spring under control of said magnet.

50. In a printing telegraph receiver, a rotatable shaft axially operable in response to received code combinations of impulses, a tension spring forsupplying energy to rotate said shaft, an electromagnet, a second spring tensionedby said magnet, and means for transmitting the energy in said second spring to said first spring.

51. In aprinting telegraph receiver, a rotatable shaft axially operable in response to received code. combinations of impulses, a tension spring for" supplying energy to rotate said shaft, an electrical source of energy, a second spring tensioned by said source ofenergy, and meahs for transmitting the energy in said second spring to said first spring, said transmission of-energy being controlled by said electrical means.

-52. In a printing telegraph receiver, a roqtatable shaft axially operable in response to received code combinations of impulses, a tension spring for supplying energy to'rotate said shaft, a source of energy, a second spring tensioned by said source of energy and means for transmitting the energy in said second spring to said first spring, the rate of transmission of said energy being controlled by said source of energy.

53. In a printing telegraph receiver, a' r0- tatable shaft axially operable in response to received code combinations ofimpulses, a tension means for supplymg energy to rosource of energy for transmitting energy to said second tension means, said lever being operated-by said second tension means for transmitting-its energy to said first mention tension means. 1 e

54. In a printlng telegraph receiver, s ,ro-

\ tatable shaft axially operable in response tatable'selector shaft and a spring member tinuous operating source of alternating curto received code combinations of impulses, a tension means for supplying energy to rotate said shaft, a source of energy, a second tension means, and a lever controlled by said source of energy and said second tension means for transmitting energy to said first mentioned tension means. 55. In a prlntmg telegraph receiver, a rofor rotating said shaft.

56. In a printing telegraph receiver, a rotatable selector shaft, a spring. member for.

rotating said shaft, a signalling line and means controlled by the received impulses over said signalling line for 'maintaining said spring member at a predetermined tension to-rotate said shaft.

57. In a printing telegraph receiver, a rotatable selector shaft, tension means for providing energy to rotate said shaft and means for controlling the rate of transmission of energy from said tension device to said shaft.

58. In a printing telegraph receiver, a r0 tatable selector shaft, tension means for providing energy to rotate said shaft, a signal-' :ling line, means controlled by impulses 'r'eceived over said line for supplying energy to said tension member, and means for controlling the rate of rotation of said shaft. 59. In a printing telegraph receiver, a roltatable selector shaft, amember for rotating said shaft, and-means responsive to re-- ceived nnpulses for maintainlng'saidspring ceived code combinations :of impulses for selectively operating said shaft to selecta' pre-determined charaeterjfor operation and means responsive to said received impulses for maintaining said spring member in tension. I

61. In a selective system, a group of stations, selecting devices located at each station, electrical connections between said sta tions, means to transmit signals'over said electrical connections 'to control said selectmg devices, meansresponslve to sa1d-s1gnals for selectively operating sald devices,

means for driving andtiming the speed of operation of said selectors comprising a conrent individual to each station, said sources stantially fixed frequency relation with-re spect to each other. r

62. In a selector system, a plurality of stations, rotatable selecting apparatus at each I station, a signalling line connected to said stations, means for transmitting signals Over i said signalling line, means responsive to said signals forjvariably operating said selector apparatus and means responsive to a 4 continuously operating source of alternat: mg current individual to each statlon, for

driving the selecting apparatus thereat at a predetermined speed and acting jointly with each of said sources of alternating current forjmaintaining. said selectors in syn= chronism. H .v l

In testimony whereof he aflixes his signature;

EDWARD'E. KLEINSCHMIDT.

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