US2375588A

US2375588A - Autointerpregraph signal recorder

Info

Publication number: US2375588A
Application number: US511439A
Authority: US
Inventors: Luther S Rose
Original assignee: Individual
Current assignee: Individual
Priority date: 1943-11-23
Filing date: 1943-11-23
Publication date: 1945-05-08
Anticipated expiration: 1962-05-08

Description

May 8, 1945. s. ROSE I ATOINTERPREGRAPH SIGNAL RECORDER Fild Nov. v25,' 1943 3 Sheets- Sheet l ma.. //r: m9

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c f www?? INVENTOR. LuTI-Ler 5. R m5 E ATTORNEYS.

May 8, 1945. L. s. RosE AUTOINTERPREGRAPH SIGNAL RECORDER 3 Sheets-Sheet 2 Filed NOV. 23, 1943- May 8, 1945. L. s. RosE Y 2,375,588

AUTOINTERPREGRAPH SIGNAL RECORDER y Filed Nav. 2s, 1945 5 sheets-,sheet 's FIG. e.

" FIG. 1o.

AFIG-12.. lsb' |52 INV ENTOR.

LLJHEI" El. ITQCIEE Patented May 8, 1945 UNITED STATES PATE-NT OFFICE AUTOINTERPRE GRAPH SIGNAL RECORDER Luther S. Rose, San Antonio, Tex.

Applcatiil Nvembel 23, 1943, Slil N0. 511,4 39

(o1. iis-2e) 4 Claims.

Tlirisinvention relates to telegraphy and more particularly to yan autointerpregraph signal recor-oer, and is an improvement upon the printing telegraph receiver disclosed in my U. S. Patent No. 2,323,155, dated June 29,1943- An important object is to provide a novel telegraph system embodying means for receiving international Morse code or any code consisting oi a combination of dots and dashes or, in other words, long and short electrical impulses, representing alphabetical and numerical characters, this means functioning to convert the dots and dashes into typ'ewritten messages.

A further object is to provide av system of this character which may be used universally to decode messages, and which System is adaptable for use in wire telegraphy as well as in connection with wireless telegraphy for the translation of code signals into print.

Another' object of the invention is to provide a receiving system for code messages wherein the code signals are translated into print by electro-magnetic meansoperable for routing the signals to proper key actuating means of a typewriter.

A still further and important object of the invention is to provide a code receiving and printing system of this character wherein the number of vcontrol relays is reduced to a minimum, thus providing for simplicity', low manufacturing cost, and reduced floor space'.

A still iurther object is to provide a, receiving system for code messages which may be readily associated with standard typewriters for typing the code messages intotypewritten messages.

Another important object is to eliminate certain relays contained in the apparatus disclosed in my patent referred to above, and to employ, with a sensitive relay, two associated Small, light weight electro-mechanical switches.

Gther obiects' and advantages of the invention willbe apparent from the following detailed de scription of the invention, taken in connection with the accompanying drawings, forming a portion of this specification, and in which drawings:

Figure 1 is a wiring diagram of a preferred embodiment oi the lallparatus.

i'igure 2 is a view of a preferred form of circuitcontrolled switch means for the apparatus.

Figures 3, 4, and 5 are diagrammatic views illustrating progressive position of electro-mechanical switching devices forming parts of the circuit-'controlled switch means.

Figures 6, 7, and 8 are enlarged fragmentary D; and spacing 0r operating `means F for the characters-receiving means G.

The typewriting machine A may have a plurality ol conventional key 4levers I5, operating type bars in the usual manner, the connection between these key levers l5 and the novel apparatus being armatures to be later described.

The receiving relay means B, includes a receiving relay iii, which is, preferably, a sensitive one, employed to pick up the weak signals and relay the impulses to the local circuit of the ap' paratus, an armature l'l, associated with the relay lt, pvoted at one end and so movable between spaced contacts lil and i9 and connected through battery lines or conductors 29 and 2l to battery 22,there being an open-circuit switch 23, having switch 24 and contact 25 interposed in the battery lines. `The armature l'l is normally held in engagement with the contact i8 as 'by a retraction coil spring 25.

The Contact lt forms one terminal of an automatic time delay switch means 2l, while the op'- posite terminals 28 and 2S of the switch means l.' are connected in series thru conductor 30 to the spacing electro magnet 3l into the ground 3l. The switch means 27 may be considered as a controlswitch and is slower in actionv than the receiving relay it, that is, it Opens and closes the circuits atthe

contacts

28 and 29 only afterv a certain period oi time has elapsed and after the circuit has been closed at contact I8 by the relay it. This switch means 21 performs the functions ol the relays 2l and 22' described in my U. S. Patent No. 2,323,155. Preferably, the switch means is of as light weight as possible.

ltmay be well 'to state here that the switch means 2f'I is controlled by the armature Il of the relay i6. An arm 33 (shown in Figure 2) mounted on the armature I'L'and not necessarily insulated from same, rotatably carries, at its free end, a small rotating member or wheel 34, which latter may be of rubber, ber or leather and is free to rotate and when it is in the up position, as shown in Figure l, it bears against the arcuate face 35 of the arm 36 of the switch means 21 in such a manner as to cause the arm 36 to rotate in a denite direction, since it is pivoted, as at 31 at its center. This causes a straight portion 38 of the arm 3B, extending radially from pivot 31, tomove in the direction of the arrow 39 towards the contact 28 to close the circuit, when a certain time has elapsed after the closing of the circuit at the contact I3 by the armature I1. From this, it may be seen that if this moves at a certain deinite rate of speed and an electrical impulse is immediately received by relay I6, the circuit is closed at I3 only for a short time period and the moving straight portion 38 of the switch arm 36 will not have time to reach the contact 28 and, therefore, the circuit will not be closed at that point. However, if the armature I1 remains in the up position for a longer period. of time, the portion 33 will have time to move around to the position where it will close the circuit at contact 28, and energize electro magnet 3|. If the armature remains up for a still longer period of time'the portion 38 will continue to move around in the direction of the arrow 39 towards the contact 29 and, if enough time elapses, it will close the circuit again at 29 causing the electro magnet 3l to become energized the second time and will in turn perform the same function of the relay 22 as shown in my prior patent referred to above, i. e., causing an extra space to be made, at the proper time, on the typewriter or, in other words, the same as the spacing between two sentences.

The switch arm 3G is as light in weight as possible and free to rotate approximately one half revolution, more or less, against the tension of the retraction spring 4t. The instant the pressure from the wheel 34 is released, the arm 36 will automatically swing back, by the pull of the spring 40, so that they portion 38 will contact the stop 4 l, and the portion 33 will be free to start all over again the instant the wheel 34 makes contact with the arcuate face :l of the switch arm 36. The wheel 34 rotates at a substantially constant speed, controlled as by the motor 42 (there being a suitable conventional Iiexible connection be tween the motor 42 and the shaft on which the wheel 34 is mounted). The speed of the motor 42 is regulated by the means which may be a governor or rheostat.

If the portion 33 of the switch arm 36 should rotate past the contact 29 so that the wheel 34 would normally run ofi' the arcuate face 35 a small electromagnet 44 (connected to the conductor 45, and grounded at 45 and energized by the battery 22 when the armature ll makes contact or closes the circuit at the contact I8) will attract the portion 38 (constructed of magnetic material) and draw it slightly past the point where the wheel 34 would run off of the face 35 (and would continue to wear against this face). Therefore, no matter how long the armature l'! remains in the up position and the switch arm 33 rotates to a, certain point, the latter will stop at the electromagnet 44 and, while the wheel 34 will con tinue to turn, it will not rotate against the face 35.

The arm 33 of Figure 2` is secured rigidly to the armature I1 in any way most convenient.

Both

contacts

28 and 29 are connected thru conductor 30 to conductor 41, which leads to the typing circuit which will be described later. From contact i8 a conductor 4B extends to a brush contact 49, electricaly connected with the switch arm 36, and the conductor 45 is connected with the conductor 48.

The contact lll forms one terminal of switch arm 5!! through conductors 5l and 52 and brush 53. The xed contact 34 leads to the switching means C thru line 55. This switch arm 5D and associated structure forms a slow acting switch similar to the switch arm 36 and associated structure, is pivoted as at 5B, has an arcuate face 51, a straight arm portion 53, contraction coil spring 59 operatively connected to the portion 58, a stop Gli and electromagnet 6l for the portion 58. rlhere is also provided a conductor 52 to the conductor 5l and ground 63 for the electromagnet Eil. This switch arm 5i? differs from arm 36 in that it operates when an electrical impulse is being received by relay i6 which causes the arma ture ll to move down and the wheel 34, contacting the arcuate face 51, eieots rotationof the arm Eil) in the direction shown by the arrow 64 toward the contact 34. This switch operates only when an electrical impulse is being received, while switch arm 3E operates only when no electrical impulse is being received. Only one of the two switches operates at any one time. If an electrical impulse of short duration is received by the relay I3 the armature Il moves downward making contact with contact I9 and, at the same time, the wheel 34 contacts the face 51 andstarts the arm in the direction of the fixed contact 54. However, if the impulse is of a short duration only and the speed of the motor 42 is true, the arm 5Fl does not reach contact 54, therefore the circuit will not be completed. If an electrical impulse of a longer duration is received by the relay l5 the arm 50 will have time to reach contact 54 electrically connected to line 55.

The electro-mechanical switching means C serves to route the received signals or electrical impulses, for operation of the proper keys of the typewriter A, and embodies a ratchet or escapement means 65 operable for controlling the position of two rotating members or switches 66 and 61.

The switch 66 may be considered a group selece tor switch, that is, it selects the letter or character group to which the particular code group belongs, while the switch 61 may be considered a combination selector switch, as it selects the proper circuit switching combination for each particular code combination.

The ratchet escapement means 65 embodies a rotating member or ratchet wheel 63 fixed upon a metallic shaft 69 suitably journaled in a support 10 shown in Figure 2. This shaft 89 is rotated by means of a motor 42 which is connected to the shaft through a suitable train of speed reducing gears 1|, to reduce the speed, and a sliding clutch 12 which latter may be any preferred form. The oppositeside of the sliding clutch 12 is connected to the escapement wheel $8, by cooperation of an expansion coil spring 13. The motor may be run continuously and is connected to the shaft 69 through the sliding clutch 1l with just enough pressure to cause the spring 13 to contract sufliciently to cause the shaft 69 to turn normally when the dog or stop arm 14, to be described, is disengaged from the teeth of the escapement wheel 68.

It may be noted that, by having the spring 13 positioned as it is, the motor 42 is not required to turn as fast as it normally'would do as the escapement wheel B does not turn continuously, but operates intermittently; therefore Ythe spring 13 will be caused vto comp-ress to a certain tension and as quick as the dog or stop arm 14 is disengaged from the teeth of the wheel t3, `the latter will immediately rotate the shaft (with vthe switches) thereby speeding up the action of the

switches

96 and 51. This is very important in the operation of the apparatus as a whole. As shown, the ratchet wheel 69 is provided with twelve spaced apart teeth or lugs 15 and I5 to 35, the last being the starter tooth and this latter presents a greater area to thedog 14 than does the

teeth

15 and 15 to 84, whereby one movement of the armature 95 will not wholly release the tooth 85 from dog 14, but a second movement o1 the armature 85 will effect such release, and each time the armature 95 moves upwardly to release a tooth, other than tooth 85, the wheel 08 will rotate a step, this to be explainedsubsequently in detail.

Rotation of the escapement wheel 68 is controlled by two relays B6 and 01 which are respectively grounded on one side as at 88 and 89. One side of the relay 81 is connected thru line 90 with the battery line 20, while one Side of the relay 86 is connected thru line`5| with the contact I9. Thus, it will be seen, that operation of the escapement means 65 is controlled by the relay |6 and battery 22. It will be noted that current will ow directly from the battery 22 thru relay 81 to ground 89 and, thereby, keep the relay 81 energized until the circuit is broken in this line, as will later be seen, by the open circuiting switch 23. The relay 81 has an armature 9| pivoted as by pin 92 and spring urged as at 93 against a stop 94. There is also an armature 95 for the relay 86, pivotedl by the pivot pin 92 at one end thereof and is normally spring urged against. the armature 9| by a retraction coil spring 95. The dog or step arm 14 is the free end part of the armature 95. The pivot pin 92 is a pivot for both armatures and extends through a suitable stationary member, as a bearing. This arm 14 ycooperates with the starterrtooth or lug 05 of the escapement wheel 68 for holding the latter at a starting position, when the dog or stop arm 14 is disengaged from the ratchet teeth or lugs 15 to 84 and'15.

When the relay 81 is energized, the dog 14 is forced up, into a position free of the lower part of the starter lug 85. Now, each time the receiving relay I6 is actuated and causes the armature I1 to engage momentarily the contact I9, a circuit will be closed thru relay 86 and cause its armature 95 to move upwardly as in Figure 4, with the dog 14 fully releasing the lugv 85, so that the wheel 68 will be released and rotate one notch or step in the direction indicated by the arrow 96. Thus, when the relay 81 is energized, the wheel 68 will be rotated one tooth or lug each time an electrical impulse is received thru the relay 86. A leaf spring 91 is mounted. on the armature 95. Its function is to take up shock when the tooth or lugs strike the dog 14.

Key actuating means D includes solenoids for operating the keys of the typewriter A and are arranged in banks andare associated with selector switching means E provided for completing a circuit thru these banks in sequence. For convenience, these key-actuating solenoids will be referred to by the .letters andv numerals with which they are associated. vWhile only five banks of solenoids have been shown, this number may be increased in accordance with the number of code characters to a code group which it is desired to receive. In the arrangement illustrated, the numeral |00 represents a bank of two sole noids or electromagnets for operating the lkeys T and E; IOI a bank of four solenoids for operating the keys M, N, A and I; |02 a bank of eight solenoids for operating the vkeys O, G, K, D, W, R, U and S; |03 a bankof sixteen solenoids for operating the keys H, V, F, L, P., J, B, X, C, Y, Z and Q, four of these solenoids being extra and need not be employed unless necessary; and |04 -a bank of solenoids for operating the numeral keys of the typewriter. These key-actuating solenoids are each independent of one another and are connected to' separate spring contacts |05 which are mounted on an insulated strip |06 disposed longitudinally of the shaft 69.

The metallic shaft 69 is grounded as at |01 and is provided with metallic segments |08, |09, H0, III and II2, shown particularly in Figures 2 to 5, which are so spaced about the shaft and of such length and so related to the spring contacts |05 as to complete electrical circuits vthru their respective banks of solenoids in sequence when the shaft is rotated in the direction indicated by the arrow I3 their disposition radially about the shaft being such that only one segment will contact a solenoid bank at one time. As will be seen,

Respectively associated with the solenoid banks |00 to |04 is a series of solenoid selector or rout ing switches II4, IIE, IIE, I|1 and IIB which control opening and closing of circuits to selected solenoids of the banks as is apparent from Figure 1. The switch II4 may be a single-pole double throw switch, the switch I I5 a double-pole doublethrow switch, the switch ||6 a four-pole doublethrow switch, the switch I I1 an eight-pole doublethrow' switch and the switch H6 an eight-pole double-throw switch. The switch blades of the switches II4 to IIB are connected to control rods or bars II9 and are held in an upward normal position by springs |20. The switch blade of the switch II4 is connected by conductor 41 to the line 30.

These selector switches II4 to II8 are respectively controlled by a series of holding relays I2 I, |22, |23, |24 and |25, each having an armature |26 connected to the control `bar I I9 of their respective selector switches. The armatures |26 are electrically connected by line |21 to the line leading to the battery line 20. 'Each of the relays |2| to |25 is grounded at one side as at |28 and at the other side of each are respectively connected tor contacts |29 to |33 which are engaged by the armatures |25. Thus the relays I2I to |25 when energized, function to operate their respective selector switches thru the control bars ||9 and against the action of the springs |20. Also, when the armatures |26 are vdrawn down they will engage their associated contacts A|29 to Thus, only one bank of solenoids is closed |33 and maintain a holding circuit thru the relay until the battery circuit is opened again.

The rotating selector switch 61 controls circuits to the holding relays |2| to |25 and embodies a rotating switch arm |35 which is xed on, but electrically insulated `from, the metallic selector switch shaft 69. This arm |35 is connected to a brush arm |36 which is, in turn, electrically connected by the line 55 to the contact 54, whereby, upon closing of the switch 50 the arm |35 will be connected to the battery line 20. The rotating switch arm |35 coacts with'a series of contacts |31 to |4| inclusive, which are in turn respectively connected to the holding relays |2| to |25.

Each of the typewriter key levers |5 is provided with an armature |45 with each of which one of the key actuating solenoids is associated in a manner such as diagrammatically indicated in Figure 1. Thus, each time a character has been typed the circuit will be broken at the open circuiting switch 23.

When the circuit is broken at the switch 23, the escapement means 65 and the selector switches 66 and 61 are all returned to a starting position for proper reception of the next code group.

At this point, an example of the cycle of operation of the receiving system for the code letter F, as used in the International Morse code, will be given. The code letter F consists of two dots, a dash and another dot or, as considered in electrical terms, two by an impulse of short duration, then one of longer duration and, after this, another electrical impulse of short duration, this combination of short and long electrical impulses going to make up the code combination for the letter F.

In Figure 1 the escapement means 65 is shown in its starting position for reception of a code group, the selector switch 66 is shown at a position when the letter F is to be typed, while the switch arms 36 andl 50 are shown in their normal positions. Upon closing of the switch 23 a battery circuit is completed thru the relay 81 to ground 89, thus energizing this relay so that its armature 9| moves to the position in Figure 3 with the dog 14 of armature 95 disengaged from the lower portion of the starter tooth 85, the dog 14, however', still engages a part of the tooth 85. Since the

switches

66 and 61 are on the same shaft 69 with the ratchet or escapement wheel 68, the switch arm of the switch 61 will now engage contact |31 but segment |06 of switch 65 will not have engaged the spring contacts |05 of the solenoid bank |00. It will be seen that closing of the switch 23 places the receiver in a starting position as shown in Figure 3, and all of the code groups will begin at this point.

Now, upon receipt of the rst short impulse of the letter F at the receiving line of the relay |6, the impulse will, in turn cause the receiving relay |6 to become energized and operate the armature l1, which will be only momentarily, as this electrical impulse is of short duration. When the armature l1 is actuated by the relay I6 it engages the contact I9 and completes two circuits at the same time, one circuit being thru the relay 86 of the escapement means 65 and causing the armature 95 to be actuated, allowing the escapement or ratchet wheel 68 to be moved up only one step as shown in Figure 4. The second circuit completed by the armature I 1 is from battery line l0 thru armature |1, electromagnet 6| to ground 63, thereby tending to actuate or energize the electromagnet but, in View of the fact that the straight portion 58 is nowhere near the electromagnet 6| nothing happens unless the portion 58 moves around too far and enters the magnetic field of electromagnet 6| and is held there, in place, until the circuit is broken again at the contact I9. The relay 86 is adapted to operate quickly while the two switches 26 and 50 operate with a delaying action. The switch 50, when the speed regulator 43 is properly adjusted, will operate or close the circuit through portion 58 only when dashes are received, while the relay 86 operates on both dots, or short impulses, and dashes, or long electrical impulses. The switch 36 operates or closes the circuit electrically connected to

contacts

28 and 29 only during long duration signals or during long intervals of time as between long and short impulses in a code group 0r combination, as for letters of the alphabet, figures and the like.

By referring to Figure 4 it will be seen that, upon actuation of the armature 95 the dog 14 has been released from the starter tooth 85, which is the starting point of all code combinations or the beginning point of each letter, and that the dog 14 has engaged the next ratchet tooth 15. The switch arm |35I of the selector switch 61 is on the segment |31 which is connected to the holding relay |2| which operates the solenoid selector switch ||4, but, since the switch 50 is slow in operating and will not operate on short impulses, the circuit is not completed thru relay |2| and the switch I4 will remain in its upward or normal position.

The rst dot or short impulse of F is followed by a space, causing relay I6 to become I deenergized and the armature |1 returned by the spring 26 to make contact with the contact I8. This, in turn, connects the electromagnet 44 and switch 36 into the circuit from grounded battery 22 to line 20, armature I1, contact I8, line I4, brush 49, line 45, electromagnet 44 to ground 46.

The switch arm 36 is normally held in the position shown in Figure 1 by the spring means 40. When the armature |1 is in the up position the wheel 22 engages the arcuate face 35 in such a manner that, if the small motor 42 is operating, the wheel will, in turn, cause the straight portion 38 to start moving in the direction of the arrow 39 toward the

contacts

28 and 29. Since the spaces between characters of a combination, are of short duration and equal to one dot, there will not be time for the switch 36 to reach the

contacts

28 and 29 as it is slow in operation, similar to switch 50,

The circuit is now open to the relay B6, allowing the armature 95`to be pulled downwardly by the spring 96, thus releasing the tooth'15 and allowing the ratchet wheel 68 to rotate until the dog 14 engages the ratchet tooth 15. As in Figure 5, the segment |08 of the rotating switch 66 is now engaging the spring contact fingers |05 of the solenoids T and E of the bank |00 (the current reaching the ground thru shaft 69) but as the switch 36 has not completed the circuit at contact 28, neither of the solenoids in the bank |00 will be energized to operate a key of the typewriter.

The second impulse in the combination for the letter F is also of short duration and appears immediately following the first dot and space. Now, as before, when the second impulse is received, the relay |6 is operated which, in turn, causes the ratchet means 6-5 to operate, moving, in turn, the rotating switch arm |35 on the segment |38 of the switch 61 and placing the relay |22 in condition to be actuated if and when switch 50 is actuated, as the, circuit is never complete until switch arm 50 has closed the circuit at contact 54 and, as the secondimpulse is of short duration, it will not cause the switch arm 50 to actuate, therefore the circuit is left open thru the relay |22, with the switch III in its upward normal position.V

The second'impulse is immediately followed by a space (as heretofore) and this space followed by a third impulse whichis of longer duration. This will actuate the ratchet means 65 and will cause the slow acting switch 50 to rotate, closing the circuit contact 54 and causing the relay |23 to be operated from grounded battery 22, switches 2| and 23, line 20, cont'act I9, lines 5I and 52, brush '53, switch arm 50, contact 54, line 55, brush |36, rotating switch arm |35, segment |39 and relay |23 to ground. The relay |23 being energized, attracts its armature |26, and causes a connection to be made at the contact |3I and at the same time, moves the switch arms of the switch |65 downwardly as in Figure 1. Of course, the solenoid selector switches I|4 to ||8-remain in an upward or normal position for the` short impulses or dots and are moved downwardly by their respective relays I2| to |25 on the long impulses or dashes of the code combination.

There is now another circuit completed from grounded battery 22, switches 2| and 23, lines and 91armature |26 of relay |23, contact |3I, relay |23 to ground |28, thereby completing this circuit and keeping the relay |23 energized even after the moving contact has moved to another segment of the switch 61. This circuit will therefore remain closed until the circuit is opened at the switch 2.3 or anywhere in series with the circuit to the battery 22.

As the third or long impulse toy make up the code combination for F is followed by a space of short duration Athe armature I1 of relay I6 is returned to the position as shown engaging contact I8; also the shaft 69 has now been rotated to a position -where the segment makes contact with the contact fingers |015 of the sole- .noid bank |02 and' connects the solenoids of bank |02 to ground at |01. In view of the fact that the space following the third electrical impulse is of short duration, it will not cause the switch arm 36 to be actuated, therefore there will not be a complete circuit thru the solenoid bank |02 into ground |01 and none of these solenoids in this bank will be caused to operate.

The fourth and last impulseof the code combination for the letter F follows a space of short duration and causes the ratchet means 65 to be actuated as before, which, in turn, moves the contact arm |35 or the switch 6T to the segment |40 and the segment of the switch shaft 69 into engagement with the spring contacts |05 of the solenoid bank |03. This position of the contact arm |35 is before the last impulse has been completed and the segment III is at the end of the last impulse and after the receiving relay I6 is de-energized. As stated, the contact arm |35 is now making contact with the segment leading to relay |24, but this relay |24V cannot be caused -to actuate until the circuit is closed bythe slow acting switch ,50, therefore, `the relay |24 will not operate the selector switch I II on the fourth impulse as it is of short duration andthe armature I'l of relay I6 has now been returned, breaking connection at the contact I9. The armature I1 when returned to the position shown making connection with the contact I8 completes the circuit to the switch arm 36 (which is slow in operation) this circuit including battery 22, switches 2| and 23, armature I'l, contact I8, brush 49 and switch arm 36. A circuit thru the solenoid bank |03 is now open only at the point between the arm and the contact 28.

As the time elapsed after the fourth and last impulse is greater than the spacing time between any of the electrical impulses for that combination (this spacing time being equal to one dash) the switch arm 3B will complete the circuit at contacts 28 and 20. At contact 29 a circuit will be completed from contact 29 thru contact 28, line 30, solenoid 3| to ground 32. This solenoid 3| is employed to cause the typewriter to make spaces, therefore spaces are made on the typewriter, regardless of whether a letter has been typed or not.

Upon actuation of the switch arm 36, there is a circuitclosed (at line 4l) and completing the circuit thru one of the key-actuating solenoids, causing only one letter (F, in this case) to be typed on the typewriter.. This circuit is completed as follows: thru switch I I4 and along the wire to uppermost switch H5 (of Figure 1) (as segment |00 is not active the circuit is not completed thru solenoid bank |03) thence thru the uppermost switch II5 and along the wire therefrom to uppermost switch H6 (of Figure l) as segment |09 is not active the solenoid bank |04 will not be actuated) thence through the uppermost switch I I6 and along the wire therefrom to The open-circuiting switch 23 is adapted to open momentarily each time a key ofthe typewriter has been operated, and while shown, in Figure 1 for convenience only, as being operated by the armature |45 one of the solenoids, this switch is intended to be associated with the spacing bar mechanism of the typewriter whereby the switch 23' will be opened each time that a letter or character is typed or a space made. As will be seen, when the switch 23 is opened' all circuits of the receiver will be open circuited, except the Amotor circuit. This results in actuations as follows: First, the relays |2I to |25 will have been cleared and their switch actuating armatures returned by the springs |20 to normal positions. Next, the ratchet or escapement wheel 68 is caused tov rotate in the direction of the arrow 96 to a normal position as in Figure l, so that it will be ready to start at the beginning (dogY 'I4 holding starter tooth 85) for another letter.. Opening of the switch 23 opens the circuit to the relay 8l' whereby its armature 9| is pulled up by the spring 93. The armature 95 being pivoted at 92 withdraws the dog I4 from engagement by the teeth of the escapement wheel 68 so that the wheel 68 and shaft 69 are free to turn, whereby the

switches

66 and 61 are returned to a normal or starting position. The starter tooth 85, when it engages the dog 14, causes the ratchet wheel 68 to be stopped at the position shown in Figure l. As the switch 23 is opened only momentarily (until the typewriter key has been returned to normal) the relay B'I is again energized and attracts its armature 9|, whereby the dog 'I4 releases the lower portion of the tooth but engages the upper part of this tooth, as in Figure 3. With reference to Figure 3, all of the code groups begin at this point with the switch arm |35 of the switch 61 always on segment |31 during the iirst impulse (as in Figure 4) and the segment |88 of the switch 66 always engages the contacts |35 of the solenoid bank |06 at the end of the rst impulse as in Figure 5.

If the code combination for a certain `letter consists of three impulses the segment I of the switch 66 will always engage the contacts |05 of the third solenoid bank |62 at the end of the combination.

If the letter consists of a. combination of four electrical impulses thev segment will make connection with the iourth solenoid bank |03 at the end of the code combination (and so on for any code letter group) while the contact arm |35 of the switch 61 always makes connection with the segment for the proper relay |2|, etc.,

depending upon the impulse received, so that and the circuits closed again, the armature |1 of relay I6 engages Contact I8 and connects switch 36 into the circuit thru brush 41 and, if no electrical impulses immediately follow the rst code group, the arm 38 will be caused to move toward the contact 28 and, as no circuit is completed thru any of the solenoid banks but is completed thru the spacing coil 3| to ground 32, when the arm 38 engages the

contacts

28 and 29 to close the circuit, no letter will be typed but a space will be made as between two words in a sentence. Then, if still no further electrical impulses are received by relay I6 the switch 36 will have had time to open the circuit at 21 and will, in tu'rn, cause the arm 3B to continue to move in the direction of the arrow 39 toward the contact 29 and, completing the circuit again, momentarily make and break the circuit to the spacing coil 3|, and causes another space to occur, the same as between the end of one and the beginning of a new sentence. From this it will seen that letters will be spaced, words will also have the correct .spacing between them, and also the correct spaces will occur between sentences as in any ordinary typed letter. 1

The spacing mechanism F for the characterreceiving means represented diagrammatically in Figure 1 at |50 is presented in more detailed form in the Fgures to 13 inclusive, in which the character-receiving means G is shown as a tape 5| on which the message is to be typed, the

tape |5| being in a roll, housed in a slotted container |52 similar to a conventional typewriter ribbon roll housing. Typing paper |53, if desired is provided with a sticker |54 made of material strong enough to guide the tape (preferably a piece of fabric gummed on one side and slotted as shown at |55, |56 and |51). This, in turn, may be gummed to the paper |53 and used as a guide. It is only necessary then to place this sheet of paper |53 around the typewriter roller |58 as shown in Figure 1l and secure the roller |58 to the desired position so that the type bars will strike near the center of the slot |56. This may be done by using the marginal stops on the typewriter or any other means available, since the typewriter carriage may be set to stop at most any position by using the stops, and the typing bars will continue to strike in the same position while the tape will be moved one space each time a letter is typed.

Although Figure 9 shows a preferred form of tape operating means F any other means may be employed which will be suitable for the purpose. As a message is being typed the armature |60 is drawn or pulled down by the magnet 3| from the stop |6|. This armature is attached or pivoted as at |62 to the center of the ratchet wheel |63. During the downward movement of the armature |60, the pawl |64 prevents the ratchet wheel |63 from rotating backwards. When the electromagnet 3| becomes de-energized the contraction coil spring |65 pulls the armature upward and against the stop |6| and, at the same time, this rotates the ratchet wheel |63 a certain distance, equal to a typewriter space since the armature |60 is also provided with a pawl |66 which engages the teeth of the ratchet wheel, as in Figure 9. This causes the tape |5|, which is contacting the peripheries of the wheels |66 and |61, to move the distance of one typewriter space. able means, as a weight |68 or a conventional take 4up may be provided to keep the tape |5| taut. There is, of course, a second pawl 66 pivoted, as at |69 to the armature |60 adapted to engage the teeth of the ratchet wheel |63, as is apparent so that, when the armature |60 moves downwardly upon energization of the electromagnet 3|, the pawl |66 will ride over the teeth, but the pawl |64 will hold thev ratchet wheel |63 against rotation except when the armature |60 moves upwardly.

By combining the sensitive relay I6 with the two small and light electro-mechanical switches 36 and 50 I have eliminated the three relays 2|, 22 and 48 disclosed in my previous Patent No. 2,323,155 and have, at the same time, decreased the weight, as the motor normally ,used in the code receiving section, is used to operate the switches 36 and 5|) in the present application. By using this switching arrangement, a more practical and reliable method of analyzing the incoming code signals is provided, particularly separating the long electrical impulses from the short impulses.

The electro-mechanical switching means, or

ferred to above, is now presented in a practical form. A more rapid development of the switchy ing operation, with less motor speed and power is provided for, permitting the use of a smaller motor requiring less space and weight and, `by using a small speed regulated motor for the driving power for the switches 36 and 50 a more accurate and dependable speed regulation for synchronizing the electro-mechanical analyzing switches with the incoming code signal, is obtained, with elimination of the relays such as 2|, 22, and 48 forming a part of the assembly disclosed in the prior patent.

Various changes may be made to the form of the invention herein shown and described without departing from the spiritof the invention or scope of the following claims.

What is claimed is:

1. In an autointerpregraph signal recorder, a receiving circuit including a receiving relay responsive to dot and dash code signal impulses; a local circuit separate from the rst circuit, a normally open, slow-acting dash switch, and a normally open slow-acting time interval switch, both in the local circuit, each including a switch arm having a pivoted portion provided with arcuate face and a contact, means ybetween said relay and switches for closing them, including an armature, pivoted at one end and responsive to Any suit-` said relay, a rotating member carried hy said armature and alternately contacting the arcuate iace of each switch; electromagnetic means for moving said arcuate faces out of contact with said rotating member independently of said armature and after said switches have closed; a printing circuit controlled by the time-interval switch and including selector switch means; and circuit selector means controlled by the dash switch for operation of the selector switch means.

2. In an autointerpregraph signal recorder, a receiving circuit including a receiving relay responsive to dot and dash code signal impulses; a local circuit separate from the first circuit, a normally open, slow-acting dash switch, and a normally open slow-acting time-interval switch, both in the local circuit, each including a switch arm having a pivoted portion provided with an arcuate face and a contact, the acuate face of said time interval Switch being greater in length than the length of the Iface of said dash switch; means between said relay and switches for closing them, including an armature, pivoted at one end and responsive to said relay, a rotating member carried by said armature and alternately contacting the arcuate face of each switch;v a printing circuit controlled by the time-interval switch and including electromechanical switching means, said electro-mechanical switching means including rotating members; and a single means for rotating all of said rotating members.

3. In an autointerpregraph signal recorder, a receiving circuit including a receiving relay responsive to dot and dash code signal impulses; a local circuit separate from the first circuit, a normally open, slow-acting dash switch, and a normally open slow-acting time-interval switch, both in the local circuit, each including a contact, a switch arm having a pivoted portion provided with an arcuate face and a contact of magnetic material; means between said relay and switches for closing them, including an armature pivoted at one end and responsive to said relay and a rotating member carried by said armature and alternately contacting the arcuate face of each switch; separate 4means to disengage each of said arcuate faces from said rotating member upon the closing of said switches, each vof said last named means including an electro-magnet disposed in the path of travel of the switch arm with which it is associated, each electro-magnet being in said local circuit; a printing circuit controlled fby the time-interval switch and including selector switch means; and circ-uit selector means controlled by the dash switch for operation of the selector switch means.

4. In an autointerpregraph signal recorder, a receiving circuit including a receiving relay responsive to dot and dash code signal impulses; a local circuit separate from the first circuit; a normally open, slow-acting dash switch, and a normally open slow-acting time-interval switch, both in the local circuit, each including a switch arm having a pivoted portion provided with an arcuate face and a contact arm, and said timeinterval switch having a pair of spaced apart fixed contacts, disposed in the path of travel of the contact arm of said time-interval switch and a lead connecting said fixed contacts means between saidrelay and switches for closing them, including an armature, pivoted at one end and responsive to said relay, a rotating member carried by said armature and alternately contacting the arcuate face of each switch; and a printing circuit controlled by the time-interval switch and including electro-mechanical switching means, and a character spacing means; said lead extending to said character spacing means.

LUTHER s. ROSE.