US2419799A - Receiver transmitter - Google Patents

Description

April 29, 1947. Q N 2,419,799

RECEIVER TRANSMITTER Filed Aug. 6, 1945 2 Sheets-Sheet l as as INVENTOR CARL W. SWAN April 29, 1947.

c. w. swAN 2,419,799

RECEIVER TRANSMITTER Filed Aug. 6', 1943 2 Sheets-Sheet 2 Mr-gm 03 m 11' v FIG. 4

mvemon CARL W. SWAN v ATT NEY Patented Apr. 29, 1947 RECEIVER TRANSMITTER Carl W. Swan, Skokie, IlL, assignor to Teletype Corporation, Chicago, Ill.-,- a-corporation of Delaware Application August 6, 1943, Serial No. 497,592

2 Claims.

This invention relates to telegraph apparatus and more particularly to start-stop telegraph apparatus.

It is often desired to have code signal receiv ing apparatus wherein certain predetermined code signals may be received, where visible indications will be given that a certain signal has been received, and which will then transmit a single predetermined code signal as an acknowledgment of the received signal.

The object of the present invention is to provide an apparatus which is responsive to predetermined code signals and which transmits a single predetermined code signal as an acknowledgment of the received signal.

A further object of the invention is to provide indicating means which are operable upon the receipt of an incoming signal to identify the particular signal received.

The apparatus in general comprises a selector magnet, which upon energization in response to received signals releases a receiver-distributor for rotation. The incoming signal permutably con-- trols a plurality of code bars, which, in turn,

control a plurality of code bails. An extension on each code bail controls an electrical switch, to establish an electrical circuit to light a lamp and indicate the particular code signal received. The selector magnet also releases a transmitterdistributor for rotation which transmits a predetermined code signal over an associated signaling channel to indicate that the selector mechanism has operated.

The features and advantages of the invention will become apparent from the following detailed description of a specific embodiment thereof, when read in conjunction with the accompanying drawings, in which:

Fig. 1 is a front elevational View, partly broken away, showing the apparatus embodying the invention;

. Fig. 2 is a sectional plan view, taken approximately on the line 2-2 of Fig. 1,

Fig. .3 is a side elevational View, partly broken away, of the apparatus shown in Fig. 1;

Fig. 4 is a side sectional view, taken approximately on the line 44 of Fig. 1,

Fig. 5 is a fragmentary side sectional view taken approximately on the line 5-5 of Fig. 1;

Fig. 6 is a schematic wiring diagram showing the electrical circuit of the received signal indicator; I

Fig. 7 is a schematic Wiring diagram showing the electrical circuit of the transmitting signal acknowledger; and

Fig. 8 is, a detail view showing the construction of the clutch mechanism. v The apparatus comprises a vertical base H which may be secured to any suitable equipment, such as a panel, etc. A pair of bearing brackets l2 and [3' are secured by means'of screws'to the base H, on opposite sides thereof. A shaftl4-is rotatably journalled in thebearing brackets l2 and I3, extendinghorizontally almost the entire Width of the base ll.

The shaft l 4 is composed, toward the right end, of a receiving-distributing assembly designated generally by the numeral 5, and a transmitterdistributor assembly designated generally by the numeral ll toward the left end. The assemblies It and I! are separated by a somewhat thinner section of shafting, around which is positioned a freely rotatable sleeve l3. The'sle'eve l8 has a gear [9 firmly secured to its left end, as seen in Fig. 1, which in turn engages with a pinion 2| which is situated at the end of a shaft extending from the motor 22 (Fig. 2). The motor shaft 'constantly rotates, causing the pinion 2! to do likewise, thus causing the sleeve l8 to be constantly rotated. The shaft l4, however, is intermittently driven, the driving force being imparted by the constantly rotating sleeve l8.by means of clutching mechanism which will hereinafter be explained in detail. i

A bracket 23, better seen in Fig. 3, is securely fastened to the plate ll,and supports an electromagnet 24 which is positioned adjacent the up,- per end of an armature 26. The armature. 26 is normally positioned away from the electro-magnet 24, by means ofa spring 21 which is secured to the upper end 'of the armature 26 and to the base II. The magnet 24 is responsive to code signal impulses, preferably of the Baudot type, which are'received by the receiving apparatus over a signaling channel, as will be hereinafter explained. a

The receiver-distributor assembly 16 comprises a disc-29 and eight cams 3ll to 31, inclusive, all firmly secured to the shaft I4 in such a manner as to rotate with the shaft. The cam 30 to 31, inclusive, each have an associated cam follower 39 to 46, respectively, which are each shaped with a lug 56, thereon to be operated by the corresponding cam during a predetermined portion of the cycle of operation of the shaft M, the time of operation depending on the individual contour of the cams. The cam followers 39 to 46 are each pivotally mounted in a 'block 48 which is secured 'to and extends from the back of the base II'. The cam followers are normally pivoted 3 'so as to be in engagement with their associated cams by means of individual springs 49.

The cam follower 45 is formed at its forward end with an upwardly-extending lug 5|, and at its opposite end with an upwardly extending member 52 which acts as a clutching and clutch release member (Fig. 8). The cam follower 45 is normally held in a downward position asthe lower end of the armature 26 is normally above the upturned lug 5|. This pivots the member 52 which is a part of the cam follower 45, in a counterclockwise direction, as viewed in Fig. 3, and

allows it to disengage the clutching mechanism, as will be explained later. In the event that the armature is moved from above, the upturned lu 5|, due to the energization of the magnet 24, the cam follower 45 will pivot in a clockwise direction, as viewed in Fig. 3, under the tension of the spring 49, which will result in the member '52 also being moved in a clockwise direction to thereby allow the clutching mechanism to engage'ahd cause rotation of the shaft [-4. The cam follower 45 is under the control of its associated cam 35 and will only be permitted to rise during a certain period of the cycle of operation of the shaft l4, even though the armature 26 may not be above the upturned lug 5 I.

' Cam followers 39, 40, 42, 44 and 46 are each formed, toward their forward end, with a shoulder 53 and a square end 54, as better seenin 3. These cam followers are normally urged toward thecontour of'their associated cams 30, 3|, 33, 3,6, and 31, respectively, by means of the indif'dual springs 49, which causes engagement of the, upwardly extending lug 56, on thecam followers, with the cam surface. During a certain portion of; the cycle of operation of shaft l4, an indentation in the contour of the cam will be presented to each lug. 56, on each cam follower which, due to the spring 49 pivoting the cam follower in a clockwise direction, as viewed in Fig.

3, willv cause the, cam followers to rise to their upper position. The forward end of the cam followers are heldin a lateral position by means of a pair of guide plates 51, one plate being positioned, to either side of theindividual cam followers.

The cam follower, 4| isformeduat itsforward end in a configuration, as seen in Fig. 4, wherein theforward end is formed of two opposite, roundedlugs 58 with an. opening between. them in the shape .of. a semi-circle which has an upwardly extending lug 59, in the center thereof. The cam-follow.er.4| is normally held with its front end in an upward position, with the armature 26' extending into the opening between, the lugs 58 and to one or the other side of. the upwardly extending lug59. Thus, the lug 59 acts tov lock the armature 26 in its forwarder-backward position. During a predetermined portion of the cycle of operation of the shaft M the cam 32, which is associated with the cam follower 4|, will; force the cam follower 4| to its downward position, overcoming the tension of the spring 49. During the interval that the cam follower 4| isinits downward position the upwardly extending lug, 59 will be at a lower elevation than the} bottom of the armature 26, which will allow the armature to be moved to its inward or outward position, depending. on the nature of the impulses of the code signal being received by theqreceiving apparatus. Thisinterval is relatively short in duration and the cam immedie el i s eaiter l ws e m el o e 1, to

4 rise again due to the force of its associated spring 49, thereby causing the upwardly extending lug 59 to be positioned above the elevation of the bottom of the armature 26 and either in front or behind it. When this occurs the armature 26 will be locked in whichever of its two positions it happens to be in at that time, until a subsequent downward movement of the cam follower 4|. w I

A pair of brackets 6| and 62 are secured perpendicularly to the base H, on either side of the cam followers previously described, and, in turn, support between them, toward their lower forward edge, a block 63.

Pivotally mounted on a pivot shaft 60 carried in the block 63 are a series of selector levers 64, one, positioned in front of and corresponding to the cam followers 39, 40, 42, 44 and 46. The selector. levers 64 are formed with a slot 66 toward their bottom, by means of which they are mounted pivotally in the block 63. However, the slot is longer in length than the rod on which the levers are pivoted, so that there can be a limited upward and downward movement of the selector levers. The forward lower end of the selector levers has secured therein a spring 61 which is connected at its top to a bracket 68 which extends outwardly fromthe bracket 62. The springs 61 normally pivot the selector levers 64 in a clockwise direction, as viewed in Fig. .4, wh ch causes their upper ends to be positioned in engagement with the square end 54 of the corresponding cam, follower. The selector levers 64 are laterally aligned with respect to their associated cam followers 39, 40, 42, 44 and 46, by means of the previously mentioned pairs of guide plates 5], one of which extends on either side of a portion of the selector levers 64. The upper inner edge of each of the selector levers 64 is formed with a shoulder. 69 which may or maynot be engaged by the square end 54, of the. associated cam. follower, depending on the position of the cam followers. The forward edge of. the selector levers 64 is formed of three outwardly extending lugs H spaced substantially as indicatedin Fig. 4. The selector levers 64 are normally held in their upward position by means ofthe springs 61. In the event that the square end54 of the cam followers rise to a high enough position, due to their corresponding cam contours, the selector levers will move inwardly so that the square end of the cam follower will rest upon the shoulder 69 of each selector lever 64, Upon a subsequent counterclockwise actuation of the cam follower, due to the contourof their associated cams, the selector levers 54-wlll also be depressed, a distance limited by the length of the slot 66 at their pivot point, because of the pressure exerted by the cam followers upon the shoulders 69.

Three code bails 12, I3, and 14 are mounted pivotally to the block 63 and are urged inwardly under the tension of their individual springs 16. 'These bails each have five reversible code lugs" connectedv thereto, which'may beposltioned with their body projection either above or below thebail. Each of the lugs 11 are connected to the bail so as to be aligned with one of the selector levers 64. The code bails l2, l3, and M have rearwardly extending arms", 19, and 8|, respectively (Figs. 3, 4, and 5), the utility of which. will be explained later.

. Asmentioned above, there are five reversible code lugs 11 positioned on each of thecpdebails,

antic?) s a. oneeachjn' front. of eachof the five'iselector bars 6E .The reversible code lugs are positioned .witlia' body projection extending either above o'ii-below the code bail, with-a leaf spring of the code lug on the opposite side of the codebail holding it in place. Thus, it is possibleto reverse the code lugs T! to a position with its body projection either above or below the code bail. Depending on whether the body projection of the code lug is above or below the code bail will determine whether the body projection will engage the lug H on the selector lever 64 and thus prevent the code bail from moving to its inward limit under the force of its associated spring E6 or whether it will enter the space between the lugs ll. The code lugs are positioned in predetermined positions so as to predetermine the code signal to which the particular bail E2, 13, or M will be responsive; in other words, the position in which the bailswillmove clockwise in response to predetermined positions of the selector levers it responsive to a received code signal.

The cam follower 43 which is under the control of the cam 35, is formed with a depending "por- 'tion 82 which is terminated in a block having anfadjusting screw 83 therein. Adjacent the depending portion 82 (of the cam follower '33) is a member 853 pivoted in the block :33, which extends the width of the five selector levers 64 and which controls a lever as which is also mounted pivotally in block 63. The lever 8% is laterally positioned by means of a pair of guide plates 8?, one being positioned on each side of the top of the lever. The front edge of the lever 88 is positioned against the code bails l2, l3, and 14, so that when the lever 86 is in its forward position, the balls will not be able to move inwardly, even though a correct setting of the selector bars ha occurred. The member 84 has an edge which, as previously mentioned, extends across the back of the five selector bars 64; this limits the inward movement of the selector bars. During a certain portion of the cycle of operation of the shaft 1 3 the cam follower GS'is presented with a r cess in the cam 34, which results in the cam follower being free to pivot in a counterclockwise direction, as viewed in Fig. 4. When this occurs the depending portion 82, of the cam follower 43, likewise moves in a counterclockwise direction allowing the member 84 to move to a limited extent in a clockwise direction, as viewed in Fig. 4. Any movement of the member as allows the member 86 to move inwardly, under the force exerted by the springs 16 urging the bailslZ, 13 or M inwardly, providing that a proper signal has been received. After a limited period of counterclockwise movement of the cam follower d3 it will again be moved in a clockwise direction, as viewed in Fig. 4, due to the contour of the surface of the cam 35. This device acts as a lock to prevent the bails from moving from an outward position except during a limited period of the cycle of operation of the shaft l4.

Positioned below the arms '58 and '59 and adjacent the arm 8! are three electrical switches 88, 89 and 9!, respectively (Figs. 3, 4, and Whenever one of the bails l2, H or 14 moves in a clockwise direction, as viewed in Fig. l, its associated arms "l8, 19 or 8| will likewise move in a clockwise direction and cause pressure to be exerted upon an insulated portion of the associated electrical switch, which in turn results in an electrical contact being closed and an electrical circuit established. The electrical circuit,

. pawls 95.

as shown in :Fig. 6, includes threeelectriclights 92, 93 and 9%, which are illuminated upon the closing of one of the electrical switches This acts as a visible indicator, to make it possible to readily ascertain which one of the balls has moved inwardly in response to the predetermined code signal which controls it.

The clutch mechanism, as disclosed in Fig. 8, comprises three pawlsv 96 which are pivotally connected to the disc 29 by means of a post 91. The pawls 36 are normally urged in a counterclockwise direction, as viewed in Fig. 8, by means of their individual springs 98. Each of'the pawls has a single tooth 99 thereon, the teeth being 1 positioned in a staggered relation to each other on the respective pawls, for a reason which will be later explained. The disc 29 is provided with a post iii! which acts as a limit for' the clockwise movement of the pawls 98. Secured firmly to the sleeve 18 is a ratchet wheel 502 which is positioned adjacent the three pawls 96, so that .engagement is possible under certain circumstances. The periphery of the disc 29 has a V-shaped notch I83 in it in which a roller 194 (Fig. l) may rest, depending on the position of the disc 29. The roller Hi l is positioned at one end of a lever me which is mounted pivotally to the bracket 6! and urged against the periphery of the disc 29 by means of a spring 435 (Figs. 3 and i) at its opposite end. In a normal position the memberbz, previously mentioned, engages the end of the pawls 95 and pivots them in a clockwise direction against the tension of their springs 98 as viewed in Fig. 8. This results in the teeth 93 of the pawls 96 being separated from the teeth in the ratchet wheel I02, resulting in no rotation being imparted from the sleeve 58 to the shaft it. Under certain conditions the member 52 will move in a counterclockwise direction (Fig. 8) thus freeing the ends of the pawls 95, which in turn are urged in a counterclockwise direction under the force of their individual springs 98. The teeth as will be urged toward the ratchet wheel H32 until one of the teeth engages the teeth on the periphery of the ratchet wheel. This permits rotation to be imparted to the shaft hi from the constantly rotating shaft it. As mentioned above, the teeth 99 were positioned in a staggered relation to each other on the individual This is done so that no matter what the position of the teeth of the ratchet wheel E02 are in respect to the teeth lit, there will always be an immediate and positive engagement of drive between the two members. Only one tooth will engage the ratchet wheel. The member 52 is only held in a counterclockwise position for a short interval during the cycle of operation of the shaft Hi and will almost immediately reassume its clockwise position. As the pawls 96 are secured to the disc 29 they will rotate with the disc and upon making a full cycle of operation of three hundred and sixty degrees will again come in contact with the member 52, thus being moved in a clockwise direction resulting in the tooth being released from the ratchet wheel. The roller I0 5, which enters the V-shaped notch I03 in the disc 29 simultaneously with the mem ber 52 forcing the pawls Bil in a clockwise direction, acts as an anti-singing device for the clutch ing mechanism. In other words, it positively acts to cause the tooth 99 to be disengaged from the teeth of the ratchet wheel Hi2 so that there will be no partial engagement during the unoperative periods of the shaft l4 and the .disc 29.

" A timing device is disclosed in Fig. 5 whichis utilized to hold the electrical switch ,.9.I its ,closed position and thus insure illumination of the indicator lamp.9,4 for .a definitepredetermined period of time. Connected rotatably to .I8 is an eccentric-III, which rotates with the sleeve I8. Placed around the eccentric III, but

,free to move in respect to the eccentric, is a pawl I I2. .arm I I3 against the surface of the ratchet wheel ,II by means of a springIM. Asecond pawl The pawl II2 is normally held with its H6 is secured pivotally at IIO to a portion of ,the code bail 14 so as to be able .tocmovevertically as the bail I4 rocks about pivot shaft. 60.

The upper end of the pawl III; is also normally held in engagement with the teeth of the ratchet wheel I01, by means of the same spring H4. A

lever? is mounted loosely adjacent the block 63, so as to be pivotable under the control of the arm 8I extending rearwardly from the code bail I I. The end H9 of the lever II! is perpendicular to the main body of the lever and is positioned immediately above the electrical switch 9I. A bell crank lever I2I is pivotally connected to the bracket 6| and is normally urged in a counterclockwise direction, as viewed in Fig. 5, by means of a spring I22. On arm I23 of the bell crank lever I2I is positioned adjacent the ratchet wheel I01 in such a manner that upon engagement with a post I08 the bell crank lever I2I will be moved in a clockwise direction. An

. arm I24 forms the second arm of the bell crank lever I 2I and is positioned with its lowest end adjacent to the end H9 of the lever- Ill. The end of the arm I24 is formed witha shoulder I26 thereon, which under certain circumstances engages the end I I9 of the lever I I! and holds it in its depressed or counterclockwise position, as viewed in Fig. 5, thereby holding the electrical switch 9| in its closed position until the lever I I1 is released. The release of lever II 1 occurs when the ratchet wheel I0! is stepped to a position whereat one of the posts I08 will engage the arm I23 of the bell crank lever I2 I, pivoting the lever in a clockwise position against the tension of the spring I22, and thereby freeing the end II9 of the lever II! from the shoulder 126, which had previously held it downward ina latched position. The ratchet wheel I0! is moved in a step-by-step manner byrmeans of the constantly, eccentrically, moving pawl- II2 whose arm I-I3 engages the teeth on the periphery of the ratchet wheel. Rotation of the ratchet wheel-I01 will cease when the arm ,I I3 of the pawl II2-reaches a position where the teeth are omitted, such as is designated by the numeral .109, At this point .the ratchet wheel will not be rotatediurther,

which acts as a pause in the timingdevice. ,However, in the event that the bail 14 is selectedthe pawl II6 will move upwardly and cause the ratchet wheel I0'I to step one notch, which is suflicient to allow the pawl II2 to-again start the ratchet wheel I01 into step-by-step rotation. The omitted portionsv I09 of the teeth on the ratchet wheel I01 are so placedwith respect .to the posts I08 that the rotationbf the ratchet wheel I01 will not stop, while the electrical contact 9I is closed and the lamp94 is illuminated but rather,,-the omitted space isencountered by,

thearmI I3 justafter the post I08 has pivoted the. bell crank, lever I2 I and freed tbe' lever 1 I I] from heshol ilfil IZSlwhich loqke i .d w

M riou n s o tne os 1.08 Q 'th ratchet wheel it ispossible to vary the lengthottirne which the switch 9| will be closed andthe visible indication maintained.

.T e .tran m t i :d s uto wh c i ocate toward the left end of the shaft I4, and to; the

switches are. successively closed upon rotatlon of the shaft I 4 by means of their corresponding ca s. The electricalcontacts. l35 to I40, inclusive, act to suppl the impulses in a standard iiveunit transmission code. The switch I35 when closed ac to ansmit the start i p e, w reas t e s it s 36 t 40. u ive. act to transmit the five code impulses, the proper combination of which in marking or spaeingrelation designates a certain code signal. 'As shown in Fig. 7,, the electrical switches I36 and I39 have been connected to ground over an obvious circuit. When these two switches are closed, by their respective cams I29 and I32, marking impulses will be transmitted. However, as electrical switches I31, I38 and I40 are not grounded, spacing impulses will occur when their respective cams I30.

bymeans of any convenient type of transmittin apparatus. However, a type of apparatus which is especially adapted forsending signals to the present receiver is disclosed in copending United Statesapplication Serial No.,497,591, fi1e d on August 6, 1943, by Carl W. Swan.

A description of operation of the present unit is very similar, regardless of which one of the three possible signals is received. .The three code bails 12,13 and I4 correspond to the letters A, B and C, such correspondence being predetermined by the position or the body pro eqtionof ,the code lugs TI either above or below thebail. However, as bai1,i4 has a timing device associatedwith it, which the other two signal bails do not have, the operation of code bail, Itwillbe. described upon receipt of ,theletterA.

The operation of the apparatus is as follows:

Contrary to the usual practice, whereinthe start impulse is normally of spacing. nature (or no-cu rentland the stop impulse .is .of ,mar king nature or current), the apparatus according .to the. present invention is operable in a system ma n 24 w ich in t r c s st vtee io o th s -1 7 to b oye m an the armatu .2

to be drawn toward the-magnet. j Thearmature 26 wi1l thus bemoved toward the right, as viewed in Fig. 3, with the result that the lower end ot the armature will no longer beaboye ;the upturned-lug 5| of the cam iollower 45. The cam ipllower liis ithen .Iree to pivot under the tension; or; gits essoclockwise direction.

ciated spring 49 if the low portion of the associated cam 35 is presented to the lug 56 on the 5am follower, 45 atthat timel The cam follower will pivotfin a clockwise direction, as viewed in Fig. 3, causing member 52 to likewise move in a Such a movement of the member 52 releases the pawls 96, which will then move in a counterclockwise direction, as viewed in Fig. 8', under control of their individual springs 98. One of the teeth 9.9 on the pawls will engage the teeth on the ratchet wheel 32 thereby imparting rotation from the constantly rotating sleeve l8 to the shaft l4. Upon rotation of the shaft M, the cam 36 will likewise rotate so that its low portion is no longer presented to the cam follower 45 and which results in the cam follower being depressed. As the start impulse was only momentary the magnet 24 has become deenergized and the armature 26, under the tension of its spring 27, has been moved to its normal position where its lower end will once again be positioned above the upturned lug 5! of the cam follower, and hold it down. The member 52 is likewise moved to its bottom position so as to be in readiness to again engage the pawls 96 and disengage the clutching mechanism, upon the completion of a cycle of operation of the shaft [4.

The cam 30 will then present its low point to the lug 56 ofthe cam follower 39, thus allowing the cam. follower to be pivoted in an upward direction, as viewed in Fig. 2, under the tension of itsassociated spring 49. The cam follower 39 will be raised a distance sufiicient to allow its forward end 54 to be above the shoulder 69 of the selector lever 64 said lever being pivoted in a clockwise direction (Fig. 4) by its associated spring 6?. Immediately thereafter the cam 30 will cause the cam follower 39 to be pivoted in a downward direction, as viewed in Fig. 2, which will result in'the square end 54 of the cam follower 39 engaging the shoulder 59 on the selector lever- 64 and moving the lever downwardly, the downward movement being limited by the length of the slot 66 in the selector lever 64 at the pivot point 59. The selector lever 54 will be held in its downward position through the entire cycle of operation of the shaft 14, as there is only one low spot on the associated cam 30. x

The description immediately above has gone on the assumption that a marking impulse, during the first unit of the 5-unit code, has been transmitted to the receiving unit thereby energizing the magnet 24 which causes the armature 26 to be attracted, as previously explained. In theevent that a spacing or no-current impulse has been transmitted to the receiving apparatus themagnet 24 will not be energized and the armature 25 will remain in its normal or released position. The lower end of the armature 26, in its normal position, is immediately above the shoulder 53 on the cam-follower 39'andthus will engage the shoulder and prevent the cam follower, from rising, under the force of its associated spring 4.9,even though the low portion of the cam 30was presented to the lug 5-5 on the cam follower. Thus, the cam follower 39 will not be able to rise and the selector lever- 54 will not be engaged thereby to. be moved downwardly-by the cam follower. I

g The cam-32 has five low portions, corresponding to the number of selector levers 64, which control the armature 25 and allow the armature to be locked either in its attractedor in its normal released position, depending on whether a marking or a spacing impulse has been transmitted. The

cam 32 presents a low portion to its cam follower 4|, thus allowing the cam follower 4| to rise under the force of its associated spring 49. .The armature 26 will thus be locked in its marking or spacing position, by means of the lug 59 at the forward end of the cam follower ll This is toinsure that the armature 26, if moved inwardly under a marking impulse, will not return .to its normal position on a shoulder 53 of a selector lever 64 and block the upward movement of a cam follower. The cam follower 4| will be allowed to rise five times, once after each impulse has been received, thus locking the armature 26 in the position in which it has been placed, for a short interval of the cycle of operation of, the shaft l4.

The above description, which has described the operation of one cam follower and its associated selector lever, is then successively carried out to allow the other four selector levers to undergo the same operation. After the five impulses have been received the selector levers will either be in their upward position or held in their downward position by their associated cam followers, depending on whether a spacing or marking impulse was received. Immediately thereafter, the

cam follower 43 is presented with a low portion on its associated cam 34 which allows the cam follower to move in a counterclockwise direction (Fig. 4) thus removing the pressure which its depending portion 82 exerted'on the pivoted lever 84. The lever 84 will then release the pivoted lever 86, which is normally held in an outwardly position and which, in turn, held the bails 12, 13 and 14 in an outwardly position, thus preventing any inward movement of the bails to be causedby their associated individual spring 16. In the event that the code lugs Tl have been positioned with their body projection above the code bar, corresponding to the marking impulses of the code signal which has been just received, or positioned below the bail corresponding to the spacihg impulses received, the bail will be free to move inwardly under the tension of the spring 16. For the present description we have assumed that bail 14 has had its five code lugs Tl positioned to correspond to the'letter A in the 5-unit Baudot code, namely two marking im-.- pulses followed by three spacing impulses." Assuming this to have been the signal received by the apparatus, the code bail M will move in:- wardly under the tension of its corresponding spring 16. As the bail 14 moves inwardly its arm 8| will be pivoted in a counterclockwise direction, as'viewed in Fig. 5, thereby causing the pivoted lever H! to also move in a counterclock wise direction. This will result in the end H9 of the lever H1 engaging the insulated portion of the electrical switch 9!, forcing it downwardly, and thus making an electrical co'ntactl' As shown in Fig. 6, the closing of the electrical switchSSl establishes a circuit which causes the light 94 to beilluminated, indicating that bail has been selected and that the letter A has been received. Immediately thereafter cam {54 causes the cam follower 43 to be moved ina clockwise direction, as viewed in Fig. i, which results in its de-. pending position,82 pivotingthe lever84 inja counterclockwise. direction which exerts pressure on the pivoted lever 85 and thus causes the bail to be forced-to its. outward position, against the tension of its spring 18.

As previously mentioned, the pivoted lever. I I! was moved in a counterclockwise direction, as

plawl Lllftvhichi iitives i n aneccentric manner m i s n t nfo lflth j ntrii U imp r @Qstep yrst b mt 01 v 'a qhettwhf e l l- Th lm bhit e l; w l he m v s ne st or en eineunt' edual to the distance" between ac;- iacen te th-9n he i h y of the em et eve y ti? e the awl HZ mak s an e en i r tati n l? l Meme. 1 99 a i dw l hfilp armgll fifilm fll heeu tw ll fin ll b? niove'djtofla pcsition where one ci it's pests will ngage the arm 23nrt e'be11 ren1; lever j z l and caiiseit to be pivoted in alclcck wise di lefl onl. a ewe in i 7 As. t er'm. !.2 in l wg w rt hfl i crank 1 31 a lever likewisebe Ii YOted in a clockwise inan nertw a sing .thet nde it e ley 1 l1 tol l f ee f q he h er. 61 t {bail lll i mean me ha b n et ii dhpi bi itwai d positiqn', i ts arm 8'! will no onger exert fiifes'si re On the} lever ll 1,1 which allbws sthe l ef ver] [1 to piv qt in a elcckvvisfe directip as viewed l t n o i s, eamt in Q t tl hou derJZB on'the bell crank, lever I2] ca'ri no longer lock it i n a 'dqwhward ppsition. HtSWeVe jdurihg h iii 'vemh the paw U his fi filme h ai Peet wheel:- UH it d s anc ili l t t e, i tance, between dias 'nt pgsts. nt; t j leve U1 has q l t n e'l'd ed dow w d when. w h 1 f lm ele tri al i h ,haj Kl i 'elq eq' quring'thistitne end its assdciated electfic h 4 l umina ed,

nnmeqi'eteiy aft th post I98 en es t e bell kt l j e J i t h voted i a: lei liwi'se (.111 recticn the hddk oh' the arm.;ll3 on the pawl 11 2 willccme in cQntaci-, ,with a .snqfi On the periphery df the ratchet wheel Wherepn a' tobth has heen qmitted'such as is designated by the'nu nieral 0,9 acts as a pause in Y the timing hi qh i m $6 tha th P?-Wl. H ni n e caius'e step' by step icta'tibn of the" ratchet heel 1- .U 'Qn ets bq ed ie.inwaid m vemen er t bail wits associatedpawll I6 mov s the ratchet tvhelllll pnestep'gwhichii's eh'dugh to allow the hook bn thel aifril H3 t'ciagatih irri pa rt step-by tep'..mdve rn n to the r at chet wheelnl'li'l fore distance equal td that between two adjacent posts lgt igs the timing device just described is only assgciiategl with the letter A, and its bail 14,1n0 motion will he imparted to the ratchet, wheel by e em e meriet e qew 1 hQn or C signals a re,rec ed a'nd their respective bails 12 en is fov army;

1 0 ntlac'ts" [3'5 t6 I40; in insive; r I ev'1euis1y -menti ned;a b 'ggn der thecbii tjcla the came in the ce t assemble n, ne'v een 1 r,., o i 1y 'cdnnec'ted' seen a is sne n t me. eiee'tneei switch 135 is if the s'te'l te's'fop v r e yvwhef' sth 'o five sw ii s up, man veeires'pend t6 th' fifve' un ts in; he enae-t code. ptevipi sly rrhentidned, these switches may be iii'f dtsrrhineqlycon cted so as toco 'respond to anyflejsirahle lcogi'e sign'al',

as in the prese t;steneeies illustrated meme; 7. 'byth'e' lettf D. Upon the idtaticn 12 e itf it e n? ter m lest? w llncm t e e qtl; w bhe isldsesus w sive'lyg" Electrical contactjlti is closed to trans;- itQ a'start signal cv'e'r, the o itgoingline; The cams to l3; 7 inclusive wi11 thenj successively close the switches I 35; to I10; inclusive, resulting 1 1 a a i m u e. in tra m tt d?! switches I 36 and B9,; whereas spacing impulses willjbe transmitted py the switches m, m and HQ, as they have notbeen grqunded arid will not establish ari electric cir ctiit 'rhqs' tlie letter will b transmitted by the present abpa ratlis ,over' an associated signaling 1 channel, which acts, as an ab s d' mi tb ditse i n ifi%+ t i h the ciei i's. a zwatus oi t emes? en; :imit'ha's'operated in response to an incoming signal- .t .n-

ns'pr'e'vie sly inenticned, the member 52 nee been retiir'ned td its cd titercldckwlse positign as sen' in F1'g,;4,tn s" being: imposition to engage the'pawls 96 lipbh c'cnfifiletip'n oi aicycle cf operatidnl tif the shaft [4 and. iivbt them in a clockwise direction, as s'eii iii Fig. 8, against the tension of their esseeietea s'priiig's 98, thereby rem'o'ving their associated'teeth 39 Item the, teeth in the periphery Qf thiratgiiit whtellfl, and thus releasing the clutching mechanismsq that n'b further rqtary iiit'iginwill be imparted to the shaft" l4 fi'bm tne fc'eiiste'nt y rotati'n'glsleeve la. until'an'othei start si'gn'a llis received by the ap phfatiisI thereby again settin the above de scribed mechanism into operatibn. The nner Hi4 w'il1'b'e i o'r'c'ed i'nto th nbtch M2 in the Deriph'eiy 0f' the" disc" 29 th'ei eby; positioning the disc'in respect to the member 52st) as toinsl re that the't'qoth has been completely withdrawn fr'om' the teeth of the retene wheel I02, I The opeiaticn' cf the above a Sp'araLti s is iden tic'al' upon the rege'ibt of a gene signal, with the exce t on that there is no tim ng device sociated with the B and Q bails 12 and '13 to act to hold the associated lctiicaliswitches and 89 closed for a pei iod ermne and, thus illuminatethe' lights SZ 'an'd' 93 to cause the visible indicator to re'lfiain illiiminatd 61- a predetern'iinedi'rite'rvaL V y H Although a specific mbe im'ent e: the inven-'- tion has been snewn'end desenbe 'd', it will be understood that this" mbcdh'nent is hilt illustrative and' that various lh'gdi'fication's may be made therein without departing from" the scope and spirit of the ihve'ritidh'.

What is claimed is; y 1. In start-step tere'g'r'epnapbai'atus, a-single shaft, a s'elctcr magnet iespcnsive to received code signal impulses for r easi g said shaft for operation a plinfalitir 6f cc'pdeha rspperating upqn the release of said shaft and befrndtahly selectable under the'cqfitiol cf saidni'a'gnt, a plurality of code bails, each 0; said cede bails rsbousiv t'ci the setting bi said cede pa e in accordenee with a preaetenninea cbtlg'signal an elec-j tricaI ee'nmee ass'dc'iate'd with each said code s; i e 'is i s i the ntt i said electrical eonte t tg visihly indicate the received signal, and a camfl'ist xihutoi f drinlng part 61 said i i ehd h i i n sre i i ts ectr we: tacts'prdeterminately set to correspond to a'ciqde signal associated therewith said electrical con t'ac't's being under the; CQIlQIfQLO f l ld j&lfi distfibiitd tq he clqs'egi "successively tq tr'anisjnit an answjeij bacig sighal, .1, V. I electrical cgntactsjcpe atingl eeneunenn with then 'rationpijsaid odebars;

hi1 stein-ts, i1 time's shaft, a selector magnet responsive to received code signal impulses for releasing said shaft for operation, a plurality of code bars operating upon the release of said shaft and permutably selectable under the control of said magnet, a plurality of code bails, a plurality of code lugs on each of said code bails, each of said code bails responsive to the setting of said code bars in accordance with a predetermined code signal as set by said code lugs, an arm on each of said code bails, an electrical contact associated with each of said code bails, each of said electrical contacts controlled by one of said arms, means responsive under the control of said electrical contacts to visibly indicate the received signal, and a cam distributor forming part of said shaft and having a plurality of electrical contacts predeterminately set to correspond to a code signal associated therewith, said electrical contacts being under the control of said cam distributor to be closed successively to transmit an answer back signal, said cam distributor and electrical contacts operating concurrently with the operation of said code bars.

CARL W. SWAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 10 Number Name Date 2,266,826 Stockfeld Dec. 23, 1941 1,895,718 Klenschmidt Jan. 31, 1933 1,943,475 Gurley Jan. 16, 1934 2,015,323 Singer Sept. 24, 1935 1 2,130,400 Salmon Sept. 20, 1938 2,183,022 Krum Dec. 12, 1939 2,162,170 Hicks June 13, 1939 1,698,294 Potts Oct. 30, 1928 FOREIGN PATENTS 20 Number Country Date 489,531 British July 28, 1938

Images