US2213559A

US2213559A - Transmission system for statistical data

Info

Publication number: US2213559A
Application number: US235820A
Authority: US
Inventors: James W Bryce
Original assignee: International Business Machines Corp
Current assignee: International Business Machines Corp
Priority date: 1938-10-19
Filing date: 1938-10-19
Publication date: 1940-09-03
Anticipated expiration: 1957-09-03

Description

.w 1 5 t y 3. h l s IF .v .Tv 2 e 6 h AS T.6

8 uw Emml cs, YRQ R01 BF. ,.t .MC wmv sd Sept. 3, 1940.`

` ATTORNEY s Sheets-sheet 2 Sept. 3, 1940. j -J. w. BRYCE TRANSMISSION SYSTEM FOR STATISTICAL DATA n Filed oct. 19. 193e mlm kwz .6 sheets-sheet 3 ATTORNEY J. w. BRYCE TRANsMissIoN SYSTEM Foa sTATzs'rIcAL um.

Filed oct. 19. 195e Sept. 3, 1940.

llbv um. IIOIWM. hm. mmm m. www Nfvm Mw n.h. \\M\1 S Sept. 3, 1940.` J. w. BRYCE TRANSMISSION SYSTEMv FOR STATISTICAL DATA Filgd oct. i9. 193e 6 sheets-sheet 4 wwwm..

llum 3m. www5 mwN, 52m Swim mw www umm., EN 1 lNvENToR Y v M- ATTORNEY bmw.-

y Sept. 3, 1940. J. w. BRYcE TRANSMISSION SYSTEM FOR STATISTICAL DATA Fi1ed ,oct. 19, 19:53 6 sheets-sheet 6 FIG.6.

INVENTOR rekenen sept. 3. 194.0

UNITED STATES PATENT GFFICE James W. Bryce, Glen Ridge, N. J., assigner to International Business Machines Corporation, New York, N. Y., la corporation o3 New York Appueenen oeteber 1s, 193s, serial' Ne.'- 235,820

9 c1eime. (c1. 17e-2) iIi'his .invention relates to transmission systems for statistical data and has for its general object the provision of means for-verifying data transmitted from a sending station to a receiving and recording station to determine the accuracy of reception by the receiving station as.l

a condition precedent to the recoy of such data'at the latter station.. O nee orm of such means lfor verifying the data is disclosed herein, another form being shown in my copending application No. 235,819, and' still another form in Amy co-pending application No.4235,821.

More speciiically, the object ofthe present invention is to provide a'remotely controlled data recording system with novel means for checking the' accuracy of such data, character by character, as a prerequisite tothe recording thereof. Thus, by preventing the recording of a data character at a" secondary station until after it has been compared for .accuracy with the original data at a primary station, the invention -attains the object of avoiding recording of inaccurate -data at thev remotely controlled recording station.

'Another object of the invention resides -in the lprovision of a plurality of novelly arranged com- .paring circuits both at the sending or primary station and at the receiving or -secondarystaacter to a receiving means at station A to be compared with the original character printed'there.

If there is any agreement, the comparing means 4becomes' fully conditioned ang causes a repeat transmission ofthe character impulses to st ation 5 B. In the event-of a lack of agreement, which is determinable `by Visuahcomparison of the printed characters at station A, an adjust key must be operated' to send out control impulses to eiect proper adjustment ot station B with lo respect to station A. Assuming, however, that the printed characters at station A agree, thn the repeal? transmission of the character impulses to station B completes the conditioning of the comparing unit at the latter station." If '15 the system is still in agreement, printing and punching of the character at station Boccurs. Should the comparison be in' error, an adjustl key at station B is depressed to send control im- :y pulses to adjust stationA with respect to stazo tion B. Under no condition may an incorrect tion for eiecting verification ofthe transmission of data. I

` The Objectis further to provide a novel ,transmissionsystem in which a data character transmitted from a first station and received at'a second station causes the operation ofverifying ments asv to the scope means at the first station to initiate a repeat 'transmission of the character from the rst sta-f tion, said repeat character transmission operating verifying 'means at the second station which in turn controls the operation of a recording means for recordingthecharacter at'the second station.

According-to the present invention, a contact control key at a station A is operated to send out a series of impulses which cause a record card to be fed into punching position at asta-v tion B, located at a remote point from station A. A character key is then depressed to print the character at station A, and at the same time to partly condition a comparing means at the latter station. Multiple impulses representingA the character as sent to receiving means at station B and there partly condition a second comparing means. The comparing `means at station Bl cooperates with a transmitting means at that station to effectretransmissionof the char-` Fg. 1b is a timing chart gram shown in Fig. 2a.

. character wbe punched at station B,'because of' the comparison required prior to the setting. up ot the punching means.

Further objects of the instant invention -re- 25 side' in any novel feature of construction or operation or novel combination on parts present in thev embodiment /of the invention described and shown in the accompanying drawings whether within or without the scope of the appended 30 claims and irrespective of other specific state- A.

of the invention'contained herein. Inrthe drawings:

Figs. lfandI 1a are representative circuit dia- 35 'grams of.v the ,transmitter and receiver respectively atstation A. n

for Vthe circuit diagram shown in Fig. 1.

Figs. 2J- and 2a are representative circuit dia- 40 grams of the receiver and transmitter respectively at station B.-

Fig. 2b is a timing chart of the circuit dia- Flg. 3 is a plan view of a portion of the trans- 45 mitted. key board. v

Fig. 4 is a sectional view taken at 4-4 oflFig. 3. Fig. 5 is a sectional View taken at 5-5 of Fig. 3,

`showing a transmitting key and the various operating mechanism associated therewith.

Fig. 6 is'a view of the dash pot control mechanism which is applied to certain relay contacts in the various circuits of the system.

Fig. 6a is a detail plan view of the mechanism associated. with thedash pot- Fig. 'I lis a detail view of,a portionof the punching mechanism.

A preferred embodiment of the invention will now be described-with reference to the accompanying drawings. At station A a special keyboard is provided as shown in Figs. 3, 4 and 5. Seven keys are shown as representative, three of them being allotted -to numerical characters and the remaining four being provided for various control operations such as space control, card feed, verifying, andadjusting. If more than three different numerals are to be transmitted more numeral keys are added, but the four control keys are suilicient regardless of an increase in the numeral keys. Depression of any of the keys causes the operation of a special set of contacts associated therewith so as to initiate a correspondingo impulse or series of impulses. If a numeral key is depressed, it also causes printing of the numeral by energizing a print solenoid'associated therewith, all of which will be described in detail hereinafter. The

mechanism illustrated in Fig. 5 in association with the adjust key I1 is similar to that for the other keys. It is seen that the depression of key I1 causes an-insulated conducting portion |1a to bridge the contact springs |1b. A notched projection |1c at the same time cams latch bar I9 to the right and then allows it to return to the left again under spring action so that the left extremity of bar I9 is positioned above the latch point on projection |1c to hold the key down. Then at a later time, as will be described later, solenoid I8 becomes energized momentarily tomove the latchbar I9 to the right away from projection I1c, thus releasing the key I1 and allowing it to raise to its normal position under the urging of its return spring |1d. It will be noted that only one key may be depressed at a .time due to the presence of locks Se (Fig. 4). When a key is down it maintains the locks ad- Ajacent thereto spread apart so that the combined clearance of the.v locks 9 is taken up dand no other key may be moved down between them. This structure is elementary and similar to that used in key-operated punches to prevent the operation of more than one key at a time so that no further description is believed necessary.

A transmitting commutator 2| (Fig. 1) and a rotatable arm 2| are also located at station A, arm 2| being maintained continuously rotating Vin a clockwise manner at uniform -speed by any suitable means such as an electric motor (not shown).

" 'I'he speed at which this arm is to rotate is detercuits aresuccessively closed depending upon -which of the keysA II to I1 was operated to eil'ect the transmission of a predetermined number of impulses from the transmitting device I3. The circuits will be'described in detail later.

The mechanism actuated at the receiver of station B by the incoming impulses comprises a chain system of multiple contact relays RI to R1 (Fig. 2) which control the/selective energization .of a plurality of print solenoids, such -as the one designated- 52 for example. Solenoid 62, upon becoming energized, pulls its armature 52a and the key lever connected thereto down so as Vto (-perate a printing mechanism which is diagrammatically represented by a platen 51, a hammer 51a, and suitable linkage 51h connects@ between the hammer and the key lever. Motion transmitted through the linkage 51h causes the hammer to be moved toward the left to strikethe platen. The leftward movement of the hammer closes a contact 62h to energize a punch solenoid 12 by a circuit to be described later. Punching mechanism of any convenient type such as shown in -the U. S. Patent No. 1,772,186 to F. L. Ice et al., for example, may. b e employed. Printing and punching under solenoid control are old inv the art, and therefore therepresentationof the printing and punching means illustrated in Fig. 2 and Fig. 7- respectively are believed suflcient.

In Fig. 7 an interposer 11 is moved to the left under control of a solenoid (not shown) so that as motor bar 'I8 is moved down sharply on the in- Vterposer 11 by the energization of the punch magnet (not shown) the punch 80 will be moved down to pierce the card C. Return springs insure the restoring of motor bar 18, the nterposer 11, and the punch 80, and the usual escapement action .advances the card C to the next column.

An impulse means comprising a commutator 2l and an arm 25 is provided at station B and there. cooperates with a transmitting device |25 to eiect the resendlng of character impulses to station A. A chain system of relays forms a receiving means at station A similar to that already described for the station Breceiver. Arm 25 is rotated in a uniform manner by means similar to that for arm 2| but not necessarily at the same speed.

Although the commutators at stations A and B do not run in synchronism, there' is a certain time controlled relationship between the receiving portion of each of these stations and the transmitting portion of the other. This comprises a control relay 55-at the receiverof each station having dash pot mechanism generally designated ,54 (Fig. 6) associated therewith to control the time of closing of a plurality of sets of contacts including those designated 55h, 55e, 55d, and 55e.

Relay coil 55,.upon becoming energized attracts the armature 5 so that a cylinder 5a attached to .the vright extremity of the armature is moved down forcing air out through an opening 1 in the dash pot 5l. It is seen that the speed of operation of

contacts

55h, 55e, 55d, and 55e aredependent upon the size of the opening 1 which is-ad justable in a manner to be explained presently. When the relay coil 55 is deenergized, the outside air rushes in through the opening 8 and the armature is allowed to restore quickly under spring action and return the above contacts to their normal position.v

The size of the opening 1 is manually adjustable by turning knb 5 which is xed to a threaded shaft 8. Automatic means for rotating .the shaft 5 in either direction is also provided so as to speed up or slow down the closing of the contacts under control of e dash pot mechanism.' A train of gears, generally designated l, connects the shaft 5 for operation by a differential device 6i actuated by a pair of pawls 9|, 9 2 and ratchets 55a, 56h. The shaft 6 forms a frictional mounting for one ofthe gears of the above train. The ratchets may` be locked or released/according to the position of a pair of cooperating

detents

2 and 3. 'Ihe detents are normally in the position shown in the drawings and are mounted on a common shaft 'I. A Asolenoid X controls the engagement and disengagement of the detents. When detent 2 is disengaged from ratchet 66a,

detent3 is engaged in ratchet 66h. A magnet |35,

when energized, causes the pawl 9| to feed ratchet' 55D clockwise one tooth. A'magnet |36 coopero transmitted through the gear train 4 to turn shaft 6 clockwise thereby decreasing the size of the opening 1. Thus, ratchet 66h is operated in the direction indicated by the arrow to speed up dash potacticn and ratchet 66a. is operated to slow down this action. The solenoid X is located in series with magnet |36 and is energized when the latter is energized soas to release the ratchet 66a. Ratchet 66D is normally free of detent 3 so that solenoid X need not be operated upon the operation of magnet |35. dash pot control mechanism and the automatic adjustment therefor will be explained in' connection with the explanation of the circuits and operv ation of the system Which now follows.

At -the start it is assumed that the printing means comprising two typewriters at station A and one at station B have paper inserted therein and that the punch at station B has a pack of fresh record cards in its hopper, and that the two stations are in adjustment which is described later. It isiirst necessary to feed a card fromA the hopper between the die and stripper of the punch tor apuncliing position. This is accomplished by transmission of a predetermined number of impulses from station A to station B. These impulses cause the energization cfa selected control magnet of the chain relay system already described which in.turn causes the punch clutch magnet to" be energized'in a manner to be describedpresently. A key I5A (Fig. l), referredto as the card feed key,is depressed (see Fig. 5 and Fig. 19 to initiate the above operation.

The depressionof the card feed key |5 causes I N conducting portion |5a to bridge contact springs l sition, wire 28, contacts 35a now closed, relay.

|5b and complete a circuit to connect relay coil 35 directly across the line. Relay 29 also becomes energized by a circuit from righthand side of the line 21, contacts |50a in their normal pocoil 29, to left hand side of the line 26.2 Relay 29, whenenerg'lzed, closes its contacts 29 which in turncomplete a circuit to energize clutch magnet 40 as follows: right hand side of the line 21,

-contacts 29a now closed, clutch magnet 40, to leftfliand side of the'line 26. The energization of magnet 40 causes the cam associated with contacts CC-3 to be clutched in for rotation with the, same shaft which carries arm '2|, Cam CC-3 therefore now rotates in synchronism with the arm 2| from the D positionl onward. Near the end of the next cycle, the camA causes the closure f its contacts CC-3 for a purpose which will be explained later. It might be well tomention herevthat the depression of any of the keys to I1 causes the clutching' in of the CC-3 cam to the commutator shaft and the energization of relay coil 29. Y

'The energization of relay 35 upon depression of the card feed key I5 causes the closing of conj tacts 35a and c-gt A- circuit completed through contacts 35a at .the time aim 2| contacts segment a of the commutator 20 in the following manner: from line 21, contacts |50a The purpose of -the intneir normal posicion, wire 2s to contacts asa now closed, `relay coil 39, contacts 39h, commutator segment 20a, arm 2|, `to line 26.Relay coil 30, upon becoming energized by the" above circuit, closes itscontacts 30a to cause the energization of relay coil 38 from line. 21, contacts 30a, relay coil 38, to line 26. The holding circuit for relay 38 is through contacts' '38a now closed and cam contacts CC-I. As previously mentioned, the CC cams are driven at the same speed commutator 20, the CC cams are in the we llknown D position as illustrated in the timing diagram (Fig. 1b). Relay 38 is provided with. contactsl 38h which are located in series With lthe transmitter 43 and are normally open. Thus, itv is seen that transmission'may be effected only when the .energization of relay coils 3|) .and 38 has occurred previous to the passage of arm 2 -over the various transmitting segments of the commutator 20. y

With relay 38 energized, a series'of impulses may now be transmitted. The transmitting circuit is from line 21 through resistance 4|, contacts 38h now closed, wire 42', contacts 35g nowclosed, relay coil 45, segment spot 20h, arm 2|, to line 26. The flow of current through resistance 4| causes a potential drop yacross it which is im'- pressed Aupon the input of the Atransmitter 43 to cause an impulse to be sent out from station A to station'B. Relay 45, upon being energized by the previously traced circuit, closes its contacts 45a to energize relay coil 44 from line 21, through relay contacts 45a, through relay coil 44, to'line 26.' Relay coil 44 is then held energized through its contacts 44a and cam contacts CC-2 until the end of the transmitting period (see timing4 Following the transmitting portion of the cycle a circuit is completed to energize relay coil 39 by means of the arm 2| from line 26, through arm-,2|, through segment spot 2011, throughcon-A .tacts 44b now closed, relay coil 39, to the other side of the line 21. .Relay vcoil 39 is held energized through its contacts 39aV and relay contacts 29h now closed. The energization of relay coil 39 by the above circuit opens its contacts 39h and prevents energization of the relay coil 30 should the keyA I5 remain depressed for another machine cycle.l 'I'his effectively prevents transmission of a repeated series of impulses for the same d'epression of the key. Key l5 is released near the end of the cycle when cam contacts C'C-3 close to energize relay' I8, which shifts latch I9 (Fig. 5) to permit key I 5 to move upward under'spring action inthe same manner as illustratedl for key I1. If the operator, however, has not yet released key I5, the shifting of latch 9 has no` the next key'depression, a new series of impulses may be transmitted.

l0 as arm 2|, and when the arm 2| is at line D of `will be explained later..

lThe ve impulses transmitted in the manner .ust described are received at station B and effect a card feed there as follows: Upon reception of each impulse at station B (Fig. 2) the receiver 50 is actuated accordingly and causes the energization of relay coil 52 for each impulse.

vCoil .52 closes its contacts 52a upon each energization.

The first impulse completes av circuit fromline 46, relay contacts 52a now closed, through center and upper relay 'contacts 5|a, Rlb, R217, etc., through R1b, wire49, relay coil 5|, and back to the other side of the line 41. Relay coil 5| then shifts its make before break contacts 5|a, that is, the center and lower contacts make before the center and upper break. Coil 5| thus remains energized for the duration of the rst impulse through relay coil 52. Contacts 5|b close and cause the energization of relay coil RI from the left-hand sideof line 46, through contacts 53a, contacts 5Ib, contacts Rla, relay coil Rl, to line 41. Relay coil RI is maintained energized through contacts RZd, the holding circuit being from line 41, relay coil Rl, transferred contacts Rla, relay contacts R2d, contacts 53a, to line`46. The contacts Rla are also of the and 63a. A,

A plurality of contacts are operated u nder the control of relay coils 55 land 55 Those operated by coil 55, including

contacts

55h, 55e, 55d, and 55e, are provided with dash pot control mechanism as already described. Contacts 55'a and 55'1, which are operated by` relay coil 55',

aresnot dash pot controlled. The purpose of the dash pot is to prevent any oneof the chain relays from being energized ton effect control until the completion of the time during which all possible signal impulses have entered the chain relay group. Accordingly, the adjustment of the dash pot is ,such that contacts 55h do not close until the arm 2| at station A has contacted the segment spot 20m, Theadiustingcircuits T 'he nextvimpulse which entersthe chain re- 'lay group causes the energization of relay coil R2 by the following circuit: from line 46, relay contacts 52a; relay contacts 5Ia` in the position shown. relay contacts Rlb in a transferred position, relay contacts R2a, relay coil R2 in the position shown,to line 41. Relay coil R2,

uponlbelng energized, shifts its a, b,- c and d contacts. The shifting of the R2d contacts, which are of "make before break type previously described, transfers the holding circuit for relay RI back through contacts 52a. Therefore,`u pon opening of these contacts, relay Rl is deenergized. Relay R2 is held energized through contacts R2a and R3d.- In a similar manner each successive impulse` entering the chain causes an energization of a new relay and deenergization of the previous one. When the ve y to the punching position.

close its contacts 61h. The closing of contacts 61h, to line 41. 'I'he depression of plunger 61a also closes contacts 61e causing'relay coil 53 to become energized by a circuit from line 41, contacts 61e, relay coil 53, to line 46. Relay coil 53, upon energization, opens its contacts 53a to deenergize relay R5, and also opens its contacts 53h to deenergize relay coil 55. With the energization of relay` coil' 68, contacts 68a,J close to complete a, circuit from line 46, through contacts 68a, through the -punch clutch magnet 10 and back to the vright-hand side of line 41. Energization of punch clutch magnet 10 shifts contacts 69 to, energize the punch motor 65 by completing-a circuit thereto from the left-hand side of line 46, through contacts 69, through motor 65, and back to line 41. The punch motor65 then op.- crates to effect the feeding of a new record card Station B is now ready to receive the impulses representative of statistical data from station A. One of the digit keys at station- A, for example,

' key I 2 (Fig, l) is now depressed and closes its "make before break type. Relay contacts-5w associated contacts 12b in a previously described manner to effect the energization of the relay coil 32. The closure of contacts 32h then completes a circuit from line 26, through contacts -32b now closed, through typewriter solenoid S2 and back to the right-hand side of line 304. Energization of solenoid S2 causes printing of the numeral 2 at station A. Closure of contact 32a causes a pickup of relay 30 and also relay 38 as previously described so as to prepare the transmitting cir- 1 cuit. Closure of contacts 32e and 32d then permits transmission of two impulses from station .A to station B, thetransmission of these impulses being e'ected in the Vsame way as for the card feed impulses. The energization of coil 32 as described above also brings about the energization of a comparing relay 202 (Fig. la) which is one of a group of relays forming la comparing unit at station A. The circuit is from line 46, contacts 32e now closed, relay coil 202,

conductors

22 and 23 to line Y41.

At the completion of the,transmitting portion of the cycle, arm 2| (Fig. 1) engages seg-v ment 20s to complete a circuit from line 26, arm 2|, segment 20s, contacts 38o now closed, relay coil |61, to line 21. ergized through parallel contacts CC-S and |6012. Contacts |61b close to provide a -circuit to connect relay coil withcommutator segment 201 as followsn from line 21, relay coilV |60, contacts 38d now closed, contacts |611, to commutator lsegment 201'. The latter circuit is not completed to the other side of the line at this time, since arm 2| has already passed segment 201'. This circuit functions in conjunction with the comparing relaysy at station A in a manner to be described hereinafter.

To continue with the example, at station B relay coll R2 becomes energized upon the reception of two impulses from station A and, at the time dash pot contacts 55h close, a circuit is completed from line46, contacts 55h now closed, receiving switch 56 now closed, contacts`R2c in a transferred position, coil |52, to line 41. This circuit energizes the coil |52 which then closes its contacts |52a (Fig. 2a). As a result, al circuit i's completed to energize a -comparing relay coil 232 as follows: from line 46, contacts |2011l now closed, escapenient contacts 58', center and lower contacts 248D, relay coil 30|. 'conductor 302,

Coil |61 ismaintained en- .61b completes a circuit to energize relay coil 60 as follows: from line 46, relay coil 68, contacts relay coil 248.is energized, contacts 24817 transtheir normal position, contacts R 2c now transing`relay coil 2|2.

41.` Contacts 232e then close to energize relay coil 262v by the circuit just traced as faras coil then via conductor 303'to contacts 232cnow closed, relay coil 262, to'line 41. Upon enrgization of coil 262, the relay 26| also becomes energized because of the closing of contacts262a which places coil 26| in parallel with the coil 262. In like'manner if three impulseshad been received, instead of thetwo assumed for the'example, coil 263 would have'becom'e energized and caused both coils 2 62 and-26| -to be placed in parallel with it. The eiect of the above relay arrangement-becomes apparent from' the description ofthe circuits for retransmitting im' as arm 25 contacts segment 24a, the transmitting circuit is completed as follows: from line 46, contacts 55g now closed, arm 25, segment 24a, contacts 26|b now closed, |08b now closed, resistance '||2, to line 41. The potential drop created across resistance ||2 causes transmission of an impulse from transmitter |25 to station A. The transmitting circuit is again completed when arm 25 en gagessegment24b, sincecontacts 262b are closed,

and thus a second impulse is transmitted back to station A.

, At the termination of the sending portion of the cycle of commutator 24 and arm 25, the latter engages segment 24j and a circuit is completed through relay contacts |08c now closed, to energize relay coil 248 which, upon becoming energized, is held through-its contacts 248a, escapement contacts 5 6', and contacts |2011. When the fer and thereby break the circuit to the 26|, 262, etc. coils and provide a. new circuit to the 24 242, etc. coils which becomes effective at al subsequent timein a mannerto be described later. Then, when the arm 25 engages segment 24g, a circuit is provided through contacts |0811, now

closed, to energize relay coil 231. Contacts 231d (Fig. 2) close to energize relay coil .53,j The energization of coil 53 opens contacts 53a, 53h and thereby deenergizes relay coils RI, R2 and 55,

At st ation A, the .two impulses sent 'from station B are received in the same manner already described for the receiving of the original two impulses at station 'Bs Thus, relay R2 at stationy A is energized (Fig. 1a) and, when contacts 55h .close, the energization of coil |12 is eiected concurrently with the energization of typewriter solenoid S" 2 by a circuit from line 46, contacts 55h now closed, receiving switch 56, R|c contacts in ferred, relay coil |12, solenoid S2 to line 41. Thus, as a result of solenoid S'2 becoming energized, the character 2 is printed on a second typewriter at station A and the circuit which caused this printing also causes theclosing of contacts |12a in the comparing unit at the latter station to bring about theenergization ofcompar- As coil 202 has been energized previously in a manner described hereinbefore, a circuit is completed upon the closing of the 2|2b contacts as follows: from 'line 46, relay coil |50, contacts20`2b now closed, contacts contacts |52a now closed, *relay coil 232, to line vmanifested in the following manner.

2| 2b also now closed. relay coi1222,'to line 41. Relaycontacts 2 22a (Fig. 1) close and contacts l60aare shifted upon the energization of coils 222 and |50` by the circuit just traced, and the way is prepared for an automatic repeat transmission of the impulses from station A to station B.

To effect a repeat transmission, one of the re-l lays 3| to 34, in this case 32, is energized by a circuit completed from line.21, contacts |50a in `the shifted position. conductor |43, contacts 222a now closed, relay coil 32, to line 46. Contacts 32a to d now close and transmission is effected in .conjunction with commutator 20, arm 2|, and

. transmitter 43 in the previously described manner. Thus, two impulses are sent once more to station B. At the completion of this second transmitting operation, arm .2| engages segment 201' and completes the .circuit to energize relay coil |60. The circuit was already conditioned for energization bythe closing of contacts |61b and.

33d, as .previouslyy described, during the rst transmitting operation. Upon energization of relay coil |60, contacts I60a close to provide a holding circuit for this relay in conjunction with cam contacts CC- 1, now closed. The energization of relay |60 also effects the deenergization of the comparing

relays

202 and 2|2 because of the opening of contacts |60c (Fig. 1a). Contacts |60b (Fig. l) also open and, when'cam'contacts CC-5 open, the circuit to relay coil |61 is broken.

Considering now the second reception of the impulses at station B, relay R2 (Fig. 2) and coil |52 are again energized in the usual manner and, with contacts 2481 (Fig. 2a) now shifted, contacts |52b close to complete a circuit to energize a comparing relay coil 24|. This circuit is from line 46, contacts |209, escapement contacts 58', contacts 246|) inltheir shifted position, relay coil 300, contacts |525 now closed, relay coil 242, to line 41. As relay 232 was energized on the r'st reception of the impulses, when relay 242 becomes energized a circuit is completed from line 46, contacts 2321) and 242D, both now closed, relay coil 252, to line 41. The circuit just traced energizes y -cause the punching of a 2 hole in the record card C in the u'sual manner. The punching operation causes a shift of the escapement'contacts 58' (Fig.` 2a) to deenergize the comparing

relays

232 and 242, and also'relay 248. Y 5

If. there is a lack of verication at' station B on the second transmission,the error will be The origi` nal transmission of impulses from 'A to B enerjgizes relay 30| temporarily, as already explained,

during the energization of comparing relay 532. Contacts 30|a close to energize relay coil 304 by a circuit from line 41, coil 304,.contacts 30|a now closed, conductor 301, to line 46. A holding circuit is now established for relay 304 from line 41,

contacts 304a now closed, contacts |20m; through a series parallel arrangement 'of normally'closed contacts of the comparing relays 23| to 234 and 24| to 244,I conductor 301, to line 46. 'The repeat transmission .of impulses from A to B causes relay 300 to become energized momentarily during thepickup of the comparing relay 242. When' contacts 300a'close, relay 305'is energized in a manner similar to that desribed for relay 304; A Relay 305, however, may or may. 'ot be held ener- .gized through the series parallel circuit of` comparing relay contacts, depending upon anagreement or lack of agreement between the first received impulsesand the repeat impulses. Thus,

ment and a parallel portion, of the holding circuit is opened to deenergize bothrelays 334 and 335. In the event that there is a lack of agreement, for example where 232 and 243 are energized, the relays 384 and 335 will remain enerand contacts 334D and.3lb complete -a circuit to energize a bulb 3 I3 which may be in the form of a red indicating light. If this light is energized and remains energized, it is an indication :it station B that the system is in error.

Accordingly, (an adjust key V|34 is depressed at station B to eifect the sending of adjusting im- -pulses to station A in a manner to be described hereinafter. Relay coil |23 becomes energized and is held energized through contacts |2Ia nowclosed, and contacts CC-S and |33d in parallel.

, Contacts |2lm open to drop the holding circuit to coils 304. and 335, and contacts -|2lp. opento vdeenergize coils 243 and 232,242, thus restoring the B station` to its normal receiving condition..

Wie: it is desired to space' between characters, the ce key |4 (Fig. 1) is depressed to send out four to station B, there to energize relay R4 in the usual manner. The comparing unit at each station 'checks these four impulses by the same method whichwas described for character transmission before permitting space solenoid 34 vto become energized to` space the typewriter. A solenoidlll then beciies energized as 'contacts 34h close tospace e record .card in the punch.'` 1

It is fev-be 'especially noted ni the above description that a double comparison is made for each. character transmitted before that character is permitted to be punched in a recordcard.l

' The first comparison is eifected at A Awhere the retransmitted character impulses from station B are compared with the original character impulses. This comparison is visual, that is,

by an observation of the printing of the character by the two typewriters at stations A. Then, the

Vsecond. comparison is made at station B when the repeat transmission character impulses are compared with original character received at that station. The second comparison for accuracy must show an t, otherwise ared signal is made to glow at station B.

In starting Operations and at various times,

- such as when the comparingunitsvshow a lack sentative of the transmitted signal,and no relaymust become effective until the time for picking up the last relay in 4the group has beenpassed.

This timing is eifected by dash pot controlled relay contacts, the adjustment for which will now be described.

These contacts at station B which "are dash. controlled must close within a period determined by the speed of rotation 'of the transmitting commutator at station A. l'hat is, the rst of a series of impulses triggers off the dash pot relay Il. 'Ihe contacts controlled by this relay must not function before the time passed tion A is contacting segment spot m.

' contacts R'Ig,

where relays 232 and 242 are energized 'by the respective sets of impulses, there is an agreewhen the last possible transmitting signal impulse might be received from station A.

Therefore, since the first impulse from station of closure of these points is checked byan. additional impulse following the time of 4signal impulses, it is possible to determine if the adjustment is correct or not on the dash pot relay. Means is provided to automatically effect correct adjustment at station B by theslgnal ofadjustment from station A and likewise station B to A. For thev machine to be in adjustment, the contacts h must close following the completion of the signal impulses and while the arm 2| at sta- When starting up sending operations, for example, each morning prior to beginning trans- .s triggers on. the dash per relay at 13, 1f the time s vns' mission, the operator at station A begins the adjusting operations. Operator at station A depresses the ladjusting key .and operator at B opens receiving switch I3 prior to adjusting to prevent printing. Depression of key |1 effects the tron of seven impulses' to station B and energization of relay R1 at this station in thecustomary manner. Sets of contacts llc,

55d,.and 33e are operated concurrently with contacts Sib f or testing the adjustment, and contacts 55'! concurrently with ll'a.. The segment -s'pct 23m whichis used for adjusting purposes is longer than any of the `other segment spots'.4 This is to hold-relay R1 energized for an appreciable period and allow some tolerance in the adjustment of the dash pot relay. Relay R1 is not pro- Vvided with the usual holding circuit through con-Q tacts at station B. Hence, relay R1 is energized only while the'arm 2| contacts segment 23m. It contacts c close while 'relay R1 is energized, the dash pot (Fig. 2) controis in adjustment and a circuit iscompleted as follows: Line 43,

relay contacts c now clod, relay contacts R`|` now closed, contacts |3|c, coil |33, to line4'l. Relay |33 upon energization is held energized through its points |33a and relay contacts Ild and |231'. Relay contacts |330, in closing, `light a green lamp in the holding circuit which informs the operator at station B that his machine is ln adjustment. Also, relay 33 is energized to open its 33a contacts and drop relay il. Operator atlvlrouldthcnbegin'sendinganadjusting impulse to station A to', operate similar circuits atthelatterstationinamannertobedescribed IfthedashpotcontroIatstation-B istoorapid, the sequence of events is as follows: '111e contacts Ile becomeLV closed before the adjusting impulse opens contacts Rig and relay coil- |3| is energized by a circuit from line 43, contacts 35e, Y relay coil |3|, to-line41. 'Relay coil |3| is held energized through contacts |'3Ia and contacts Bld and |23r. C ontacts'l3lb close to energize relay coil |32 when R'lh'closes, coil |32 being thenheld throuslvcontacts |324, 3|d and mr. Relay contacts ma, in elmg'ught a red lamp in the holding circuit to show that the adjtment is not correct.

rrthedasnpeteenxrelattaenaisteoslow contacts R1! operi and close before contacts lid open and thus relay coil |34 is energized. Also,

.een |3| is energized, but een m is not enemies at this time. A red light in the holding circuit indicates machine is still out of adjustment. The energlzation of coil |34 automatically eifects an edjmunent or the dem por. mechanism te speed up the relay action'by closing points |34b and.

energizing the adjusting magnet |35 (Fig.- 2a) action vby increasing the size of the opening 1 as has been previously explained. Closure ofr 32h points energizes magne't |36 to slow up the dash pot action by causing a clockwise rotation of shaft 6.

To transmit an adjusting impulse vfrom B to A the adjust key |04 is depressed to energize relay coil (Fig. 2) .1 Relay |20 is then held through its contacts |200, and normally closed contacts |3811 in parallel 'with CC-6.. The I20e contacts- (Fig. 2a), in closing, cooperate with the 'shifting of contacts |20b to provide a circuit for picking up relay coil |38 when'arm 25 contacts spot 24j. The |3812 contacts then close to provide for transmitting the adjusting impulses through the contacts 1201, g, h, k, m, and the transferred contacts |20c and d. An impulse circuit mayybe traced as follows: from line 4' contacts|20d in a shiftedposition, resistance H2, contacts |20c.

in a shifted position, contacts |38b now closed,

contacts |20f, |20g or |20h, etc., now closed, corresponding commutator segment 24a, 24b,x or 24e, etc., arm 25, contacts |20eto line 46. The last impulse occurs when arm 25 is on segment 24e and effects adjustment at A in a manner similar to that already described for station-B. The operator at'A seeing his adjusting lights dashing knows station B is in adjustment, and that he` may discontinue transmission of his adjusting signal to station B. Station A ,being in adjustment, the operator there sends back a single adjusting impulse to station B which indicates this fact to the B operaton The relays time.

Relay coil becomes deenergizedl when' the Isolenoids |35 or |36 shift their associated ratchet arms 9| and 92 so'as to opencontacts B0 or 6|.

When the adjustment is correct, pickup of relay Coil 63 (Fig. 2) opens 6341"'(Fig. 2a) to drop coil 55. While oo il 63 is energizedthe holding circuit of coil 55 is open, and it is necessary. therefore that `coil 5|, when energized/remains in its operated condition long' enough to drop coil 63. Coil 5| is thendeenergized in a previously described manner and its. contacts 5Ic close to pickup coil 55 once again,

While there hasfbeen shown an'd described and pointed out the. fundamental novel features of the inventiontas applied to a single modification, it Willlbe understood that various omissions and substitutions and changes in the form and detailsof the device illustrated and in its operation may be made by those skilled in the `art without departing 'from the spirit of1 the invention. It is the intention therefore to be limited only as indicated by the scope of the following claims.

.What is claimed is: y

1. In a data recording and checking system, aY transmitting station including therein means to transmit multiple primary impulses representing digit values, and a primary value checking means partly conditioned by and in. accordance with transmitting station including therein primary `combination with a receiving vstation having .sented by the secondary impulses with the data Acharacter represented bythe primary impulses,

lmeans to send primary impulses again'to the `a -receiving station embracing therein means re- -operation of the impulse responsive means, a ysecondary sending means controlled by the energized relay of the primary matching unit, means the first operationof the transmitting means;

in combination with a remote receiving and re`- cording station having therein means responsive toJ the transmitted impulses, a secondary value checking means partly conditioned by and in accordance with the operation of the impulse responsive means, return impulse means controlled by the partly conditioned verifying means for returning secondaryimpulses representing the digit value tothe transmitting station .to complete the conditioning of the primary value checking means for checking the values represented by the secondary impulses with the values represented by the primary impulses, means controlled by the fully conditioned primary checking means for eiecting a second operation'of the transmitting means. to send primary impulses again to the receiving station to' cause the full conditioning offthe secondary checking means, and perforating means at the receiving station rendered eiective by the fully conditioned secondary checking means, means for recording the .digit values on a record at the receiving station.

2. In a data .recording and comparing system, a

means to transmit multiple impulses representing a data character, a. primary data comparing ineans partly operated by and in accordance with the first operation of' the transmitting means; in

therein means responsive to the transmitted impulses, a secondary data comparing means partly operated by and according to the operation of them impulse responsive means, a secondary sending means controlled by the partly operated secondary comparing means for sending secondary impulses vto the transmitting station to complete the operation of the primary data` comparing means for comparing the' data character repremeans controlled by the fully conditioned operated primary comparing means for initiating a second operation of the primary transmitting receiving stationv to complete `the operation of the secondary comparing means, and perforating devices at the receiving station selected for operation by the fully operated secondary comparingv 4 means for perforating the data character on a record.

3. In an item recording and matching system,

a transmitting station including therein primary f means to transmit a series of impulses representing an item, and a primaryiitem matching unit comprisinga plurality of pairs of companion relays, one of said relays being energized as an incident to and in accordance with the first operation of the transmitting means; in combination with sponsive to the transmitted impulses, a secondary pairs of relays, one of the latter relays being energized as an incident to and in accordance with the gized relay of, the secondary matching 'unit for sending a series of secondary impulses representing the itemt the transmitting station to energize the companion relay of the previously ener- ;lintly controlled bythe energized relays of said primary matching unit for effecting a second'operation of the transmitting means to send a primary series of impulses again` to the receiving 7 item matching unit also comprisinga-plurality of i station to energize the companion relay to one previously energized in the secondary matching unit, perforating devices at the receiving station for perforating the item in a record, in accordance with the operation of the impulse responsive means, and means jointly controlled by the lenergized relays of said secondary matching unit for rendering the impulse responsive means eiective to c ause operation of perforating means.

4. In a data recording and verifying system, a transmitting station including therein means to transmit primary impulses corresponding to data, and a primary data verifying means partly operated by and in accordance with the rst operation of thetransmitting-means; in combination with a receiving station having means responsive to the transmitted impulses, a secondary data verifying means partly conditioned as an incident to and in accordance with Athe operation ofthe 204 impulse responsive means, means including means to send secondary` pulses corresponding to the data to the transmitting station under the control ofthe partly operated secondary verifying means for completing the operation of the primary verifying means, meanscontrolled by said fully operated primary verifying means for effecting a secondl operation of thetransmitting means to send primary impulses again to the receiving station to complete the operation of the secondary verifying means, perforating means at the receiving station for perforating the data on a record, and means rendered effective by the fully operated secondary verifying means for recording the data on a record in accordance with the operation of the impulse responsive means.

,.5. In an item recording and verifying system, a transmitting station including therein transmitting means to transmit impulses representing a selected item, -and a primary comparing unitA including a plurality of sets of matching relays,

one of said relays beingenergized as an incident to and in accordance with the rst operation of the transmitting means; in combination with a receiving station having therein receiving means for receiving said impulses, a secondary comparing unit also having Y sets of matching relays, means controlled by the receiving means in accordance with the impulses received for ener- -gizing a relay of one o i the sets of the secondary comparing unit, means effective upon the energiy zation ofthe latter relay for energizing another relay of the rst comparing unit, means dependent upon whether the two energized relays of the ilrst comparing unit are in the same set or in different sets for determining whether a-second operation of the transmitting means is tc occur, means eiective upon the second operation of the transmittingmeans for energizing` another relay of the secondary comparing unit, and perforating means at the receivingvstation rendered operative in accordancewith the operation of the impulse receiving means in ythe event that the two relays energized in the secondary comparing'unit are in the same set for perforating the item in a record. 6. In an item recording and verifying system,

a transmitting station having therein transmitting means to transmit primary impulses' representing a selected item, and a comparing. unit including a plurality of sets of matching relays, one of said relays being operated as an incident to and in accordance with the first operation of the transmitting means; in combination with a receiving station embracing therein a receiving means for receiving the transmittedimpulses,

means controlled by thereceiving means for sending secondary impulses corresponding to the item to energize another relay of the comparing unit, means dependent upon whether the two energized relays of the comparing unit are in the same set or in diiferent sets for determining 5 Iwhether primary impulses representing 'the selected item areto be retransmitted to thereceiving means by a second operation of the transmitting means, and perforating means at'the receiving stationoperated under the control of 10 the receiving means upon the reception of the retransmitted primary' impulses to perforate the selected item in a record. 7. In an item recording and verifying system, a transmitting station including therein trans- 16 mitting means to transmit impulses representing a selected item; and a receiving station having therein a comparing unit including a plurality of sets of matching relays, receiving means operated by the transmittingmeans to receive said imzo pulses, means controlled by the receiving means in accordance with the impulses received to enegize a relay of one of the sets of relays in the comparing' unit, means controlled by the receiving means to enect automatically a repeat g5 operation of the transmitting means to send repeat impulses corresponding to the selected item to operate thereceiving means to energize another relay of the comparing unit, perforating means for perforating the item in a record in ac- $0 cordance with the operation of the receiving means, means dependent upon whether the two energized relays of the comparing unit are in the same set or in different sets for'determining whether the perforating means is to be operated $6 in accordance with the receiving means following the reception of the repeat impulses from the transmitting station. 8. In combination, a transmitting station including therein transmitting devices for trans- 40 mitting primary impulses corresponding to data and a primary comparing unit with a ilrst sec# tion therein settable by'and in'l accordance with the operation of said devices; a receiving and recording Vstation remote from the transmitting 45 unit and embracing receiving devices receiving and operated according to the transmitted impulses, a perforating mechanism to perforate the data represented by the impulses in a record,` and alsoa secondary comparing unit with means opo erated by and according to the operation of the receiving devices for sending-back secondary imypulses corresponding to the digit values to the primary'comparing unit; a second section in the latter comparing unit being responsive to said 55 secondary impulses andv coacting with said ilrst section according to the setting thereof for causing a repeat transmission of the primary impulses to the secondary comparing unit, and means in the latter comparing unit responsiveto the rew ception of repeated primary impulses for causing operation of the perforating means to be eiected under control of and in accordance with the setting of said receivingdevices.

9. In combination, a transmitting station emas bracing therein a uniformly rotating transmitting commutator, and a manual' control device associated therewith 'adapted upon operation to cooperate with the commutator to transmit a predeterminednumber of control impulses; and 70 a receiving station including therein a chain of relays responsive to said impulses and operated in succession thereby to an extent corresponding to the number of impulses received. a visual indicating means, an electromagnetic time delay 75 means set in operation by the'iirst impulse received and effective at a subsequent time tov cause the last relay energizedL at that time to become eiective to operate the visual indicating" means so as to indicate by a predetermined signal whether the time delay means became eiective too early or too late, and adjustable control means for saidtime delay means arranged 9l for oneration under the control of the transmitting commutator when the manual control device at the transmitting vPstation is xoperated `for obtaining a definite timed relation between the period of operation of the time delay means and 5 the speed of rotation of the commutator.

JAMES W. BRYCE.