DEC0004240MA - - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

Registration date: May 25, 1951. Advertised on December 13, 1956

GERMAN PATENT OFFICE

The invention relates to a device for entering a series of digits on a Registration card for accounting machines with verification of the correctness of the entry.

The purpose of the invention is to avoid errors that occur when entering a code, e.g. the Account number of a bank customer, or a corresponding matriculation number on a registration card for accounting machines or on any other accounting document.

These numbers consist of a sequence of digits, e.g. B. 342 847 651. This series of digits is added as Control symbol a different from an arithmetic digit, with the sequence of digits in certain Way to add a linked identifier, for example a letter, making every possible Confusion with the numbers of the matriculation is avoided. The resulting complete Matriculation is then z. B. 342 847 651. E. The agreement in comparing between

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the symbol that, starting from the digits, can be calculated using simple operations such as the preferably carried out automatically on suitable devices, and on the Registration card or accounting document. Symbol guaranteed with a for practical needs sufficient security the correctness of the entry.

The invention relates to a device for

ίο Control of transmission errors in numerical data, those in the form of markings with an accompanying control symbol on an information carrier for automatic accounting machines are entered, the digits by simple, the control symbols - preferably Letters' - can be registered by double marks. This device contains two Element groups, which arithmetically according to the marking values of the entered figures perform metic operations separately and automatically, and from them the two together the Derive the control symbol from significant markings. The device is characterized by that at least one of the two groups mentioned contains several calculation methods and that each group is pulsed with electric current according to the location of the indicia on the carrier according to a predetermined key that is used for consecutive decimal places as The sequence of permutations varies, the number of possible variants depending on the total number of calculation paths depends; in this way an indication of the control symbol is provided in coded form obtained, which is compared with the control symbol marked on the carrier for testing.

The invention thus aims at the formation of the control symbol as a combination of two digit symbols from, each of which is established by lawfully converting the registered matriculation numbers comes. The code that determines the conversion changes from digit column to digit column and can be obtained by permutation of the ways in which, the characteristic quantities of the digits to be formed occur. The total number of variants mentioned can be reduced to less be limited to four.

In a preferred embodiment of the invention, the predetermined key is chosen so that that the electrical current impulses for one group on the associated calculation channels according to distributed in the binary system and by addition performed on base 8 in the binary system be evaluated. For the other group, the power surges can be calculated using an associated calculation method run, whereby they also follow the binary system and through cyclic addition of base 3 can be evaluated.

The characteristic control symbol is according to the invention, for example on the following The way to get it: You calculate a first control digit for the number base 3 and one at the same time second control digit to base 8; the combination

"of the two control digits provides the letter control symbol you are looking for; for the calculation of the second control digit, each digit is converted into a combination that allows" all or nothing "in three identical ways (e.g. presence or absence of a potential on three different lines), whereby this combination is characteristic of the matriculation number in question according to a previously determined key; a single way of the same type is used for the calculation of the first control number.

The invention also consists in a device for forming a symbol, in which the Matriculation numbers are converted into legal numbers according to a pre-established code, where the code changes from column to column.

By varying the code in columns, you can protect yourself in advance at the same time against the sources of error as a result of confusing two consecutive columns, against sources of error as a result of confusing two non-consecutive columns (this case is of lesser Meaning) and against sources of error, which can be referred to as a »surchargeÄ error in two consecutive Columns can denote where the two digits when entering the same value be enlarged. (It is curious that this last mistake is relatively common.)

Of course, not all codes are suitable for the intended purpose; through experiments Codes received result in a minimum of "holes" sufficient for practical needs.

Looking at a registration card for accounting machines, e.g. B. according to the "Bull" system, so you will first find at the bottom of a column three counting point locations labeled 9, 8, 7, then seven payment points marked with 6, 5, 4, 3, 2, ι, ο, to which an 11 can be added that is not shown on the map.

To identify a letter of the alphabet using the usual methods, one uses a digit from the first group, g, 8 or 7, and one of the eight digits from the second group. If you want to determine a letter control symbol, you have to determine two digits, one in a ternary system and the other in a base-8 system.

In order to determine these two control digits, according to the invention, one first sets a regular one Relationship established more or less arbitrarily for a convenient application is and at which each digit ο through 9 inclusive a group of two legal Corresponds to digits, namely one from ο to 1 inclusive and the other from ο to 7 inclusive. For example:

for ι = 0-2

for 2 = 0-4 ■. ·

for 3 = ^: 0-6

for 4 = ι-o etc.

This relationship is established for a first column of the register. You then form further relationships for the following columns by adding

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here those relationships are used which are most favorable for the different, in The most frequently occurring errors in practice (due to mix-up, due to surcharge or due to a single digit) immediately discovered when handling the legal digits will. For example, the following basic table is obtained :.

I. II III I. O-I 0-2 0-4 2 0-2 0-4 1-0 3 0-3 0-6 1-4 4th 0-4 1-0 O-I 5 0-5 1-2 0-5 6th 0-6 1-4 I-I 7th 0-7 1-6 1-5 8th 1-0 O-I 0-2 9 I-I 0-3 0-6 O 1-4 I-I 0-3

I, II, III represent the first three columns. Column IV would have the same code as that Column I; this also applies to columns V and II, VI and III etc.

Of the group of two digits, the first one, which is a 1 or an ο, becomes the base 3 without carry-over added, whereby an o, a 1 or a 2 is returned. The second digit is without carryover added to base 8 (or 2-2-2), creating a digit between ο and 7 including fluctuates. With the two control digits formed in this way, the alphabetic control letter can be obtained according to the following code.

A. 0-0 J 1-0 S. 2-0 B. O-I K I-I T 2-1 C. 0-2 L. 1-2 U 2-2 D. 0-3 M. 1-3 . V 2-3 E. 0-4 N 1-4 W. 2-4 F. 0-5 P. 1-5 X 2-5 G 0-6 Q 1-6 Y- 2-6 H 0-7 R. 1-7 Z 2-7

a b I. C. d b C. II a = 0-2 C. d III b = 0-4 I. 2 3 4th I. 2 d 4th = 0-4 I. 2 a 4th = 1-0 X = O-I 3 = 0-6 X 3 = 1-4 I. X = 0-2 X X = 1-0 X = O-I 2 X x = 0-3 X = 1-2 X X = 0-5 3 X = 0-4 X X = 1-4 X ■. . 4th X χ = 0-5 X = 1-6 X X = 1-5 5 X X = 0-6 X X X = O-I X X = 0-2 6th X X χ = 0-7 X X = 0-3 X X X = 0-6 7th X = 1-0 X X = I-I = 0-3 8th X X = I-I X X X 9 X X = 1-4 X X X X X 0 X

(It is understood that the invention can also be applied to other alphabetic codes of the same kind and apply.)

In practice, the permutation of the code is chosen to be as simple as possible, if only a sufficient one Protection against errors arises. As mentioned earlier, one uses a first way on to which a potential appears or does not appear, depending on the first natural digit a 1 or is an ο, and then a group of three similar paths according to the binary decomposition the second legal digit. It is then sufficient, according to the invention, permutations with these four ways to get permutations of the code. The one assumed above Table is then transferred in the following way (see in each column I, II or III one here the four ways 1, 2, 3, 4, on which an "x" indicates that a potential is on the corresponding Paths exist: the letters a, b, c, d indicate the permutations):

(The numbers of the paths correspond to the numbers of the chains indicated in the diagram of the device explained later, which are designated with Ch. 1, Ch. 2 , etc.)

The occurrence of potentials on the four paths is for column I through abcd, for the column II by b c d a and for the

Column III is denoted by c d a b, from which one can deduce the codes used. It is it goes without saying that the codes used are not restrictive and that they are identical Way other codes can be chosen without departing from the scope of the invention will. -

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For example, should the for

·. ■. Matriculation. .. · ........., 342 847 651

are determined, the legal

moderate digits' ...., 011111010

300 005 624. : It follows from this

for the first digit symbol

1 + 1 + .1 + 1 + 1 + 1 = 6 - 2 3 = ο

for the second digit symbol

3 + 5 + 6 + 2 + 4 = 20-2-8 = 4

The corresponding letter symbol is then E.

The invention is applied to a testing device

described in which the number to be checked in a first game by reading brushes on the Registration card is read and evaluated during the same game by the device that

automatically calculates the two numerical symbols that

in the course of a second game with the two digits of in a special column of Registration card read symbol can be compared.

In a second embodiment of the test device takes place in a single game and starting with the same brush the reading of the number to be checked, the calculation of a control symbol, the comparison of this symbol with the control symbol read on the card in the course of the same game and with the same brush and, if necessary, entering the calculated symbol on the map.

To understand the invention, the following description of the test devices in conjunction with the drawings should serve.
Fig. Ι shows schematically in section an arrangement of the essential individual parts for the reading process of the card of a tabulating machine.

Fig. 2, which is composed of the complementary parts 2 a and 2 b, shows the first Embodiment of the test device.

Fig. 2c is a part of the diagram that fits exactly to the position of the upper part of Fig. 2b delimited by the dash-dotted line A-A'-A " and with the rest of Fig. 2 and Fig. 2 a of the first embodiment gives the complete scheme of the second embodiment.

Figure 3 is a graphical representation of the closing times of the cam contacts in the circuit of Fig. 2 a and 2 b.

Fig. 4 shows a graph of the Closing times of the cam contacts in the circuit of Fig. 2 a and 2 c.

According to Fig. 1, the cards to be treated are in an upper memory MS, from which they are successively by a back and forth. incoming feed knife CA are conveyed. As it moves, the knife CA brings a card between the conveyor rollers RA 1, which push the card under the first reading brush with the pickups bi to fco, assuming (without expressing any limitation) that the register contains nine digits.

It is further assumed that the card is scanned in the column _{direction so that all count r} points the same. Have value, are scanned by the customers at the same time and that the digits are punched according to the one-hole system, the letters, however, according to the two-hole system. The recipients bi to bg read the nine-digit matriculation number, the correct entry of which is to be checked. At the moment when a hole in a column of the matriculation number is read by one of the customers b 1 to b 9, the associated magnets I to IX (Fig. 2 a) are excited, as will be described later. No letter value punched according to the two-hole system appears in the card columns read by the customers b ι to bg. These consumers are connected to the test device, but are also connected to the devices for counting, calculating and printing. The rollers RA 2 then convey the card under the second brush b, which reads the symbol registered on the card by a brush connected to the checking device, comparing this registered symbol with the symbol based on the digits of the number to be checked , is calculated by the device.

The card is then taken over by the output rollers RS and falls into the compartment CE if these two symbols are the same. In the opposite case, ie if a fault is detected by the test device, a voltage occurs at the evaluation terminal U. This voltage can be used to stop the machine or to operate any device to display the error or to sort out the card. For this purpose, the current from the evaluation terminal U excites the magnet E, whose armature actuates the flap CL via a mechanical linkage, which guides the card to the ejector rollers RA 3, from where it arrives in the compartment CS ″ of the sorted cards.

With the device of Fig. 2a and 2b, which is intended for an accounting machine with punch cards, a high speed is to be achieved in the formation of the symbol. For this purpose, the card is examined all at once by the nine brushes bi to bg , and several magnets I to IX are excited at the same time according to the reading holes. It is clear that a person skilled in the art can easily create, with the aid of the device described below, another device with a smaller number of relays for the column-by-column examination of the card, which also falls within the scope of the invention, even if it is not particularly interesting for practical purposes is. ■ = '

To understand the scheme of Fig. 2 is Please note that all contacts belonging to a relay are under it and that the movable ones Contacts are always attracted to the top; even if only five relays, namely I, II, III, IV and IX are shown, there are nine

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Relays are available, and the entire section between relays IV and IX can be added in an analogous manner without difficulty. ¹

A distributor V, which only has cams or is formed by a rotary distributor for supplying the relays, the contacts of which are connected accordingly

: ■■ den sind, supplies voltages on the four lines A, B, C and D and at the desired times, which are in the permutation table for the individual

ίο sub-columns a, b, c, d are checked. In this way, lines B and C are fed, for example, at the moment when the metering point locations 6 are read. When the counting point positions 5 are read, the lines B and D are fed. When the metering point locations 4 are read, only the line B is fed, etc. The lines A to D are therefore connected to voltage from the distributor V in various combinations for each metering point location of a card column that is read. The relays I to IX are possibly energized by the perforations read by the brushes bi to bg and close their contacts at the moment the perforation is read. As a result, the relays 11 to 49 are optionally fed; But there is an interchanging in the branches from the lines A, B, C, D (permutation abcd = bcda =: cdab. of the permutation table) for each card column in relation to the neighboring column in such a way that only the desired relays for each considered column be fed. It should first be explained that the relays 11 to 19 correspond to the only way (e.g. sub-column a of column I of the permutation table), where the regular digits are expressed in the binary system and evaluated in the ternary system, while the other three relay rows 21 to 29, 31 to 39 and 41 to 49 correspond to the evaluation based on base 8. The first relay row 21 to 29 belongs to the ones 2 ⁰ , e.g. B. the sub-column d of column I of the permutation table, the second row 31 to 39 to the one 2 ¹ , z. B. the sub-column c of column I, and the third row 41 to 49 to the one 2 ² , z. B. sub-column b of column I.

All of these relays control multiple sets of contacts. The first contacts in to 119, 121 to 129, 131 to 139 and 141 to 149 are simple holding contacts with two now closed lamellae, which hold the corresponding relay up to point 14 of the game (cf. in Fig. 3 the graphic representation for the · Opening times of the cam contacts), where · a contact C 1 interrupts all these holding circuits, thus the following. Card can be handled. The other contacts are changeover contacts for the introduction of the legal digit in one or the other counting chain, which are fed via C 2, from point 12 to point 14. Thus, if a perforation of 6 in the \ b the pickup 2 read column a map available, so when the hole is read, the relay is, II (Fig. 2 a) is energized and closes its four contacts. At this point, lines B and C are live , as described earlier. Relays 12 and 42 are energized, but relays 22 and 32 are not, because lines A and D are not energized at this moment, as can be seen from the permutation table. The relays 12 and 42 are held via the contacts C1-112 and C1-142 because the contact C 1 is closed, as Fig. 3 shows. If the card continues to move, pickup & 2 will no longer make contact through the hole and relay II will de-energize because it has no hold contact. If one examines first what is going on in the contact chain Ch. 2, which belongs to the relays 41 to 49, and what is supposed to correspond to the introduction of the digits 4 into the cyclical counting, which has the second digit symbol as the end result, then one sees that there are two contact chains. One goes via 241, 242, 243 ... 249 for the number 4, the other via 241, 342, 343. . . 349 for the number o. When the first chain is fed and no relay 41 to 49 has yet been energized, the energization of 42 causes the voltage of the lower chain to pass over to the upper chain, which means the introduction of the number 4. With the existing connections, z. B. 642, 643, energizing a second relay returns the voltage to the lower chain. In this process you have carried out 4 + 4 = 8 (equivalent to zero). Finally, a connection occurs at the left end of the chain which energizes relay 61 when a number other than 4 has been introduced for the column set.

An analogous process takes place for the ternary chain Ch. 1, which is formed by the contacts of the relays 11 to 19. Here, however, there is a chain for. the digits ο from contacts 211, 312, 413, 414, 415. . . 419, a chain for the digits 1 from the contacts 211, 212, 313, 314, 315 ... 319, which feeds the relay 75, a chain for the digits 2 from the contacts 211, 212, 213, 214, 215. . . 219, which feeds relay 74. When one of the relays 11 to 19 is energized, the tension in the chain of digits o is transferred to the chain of digits 1; when a second relay is energized, there is a transition from the chain of digits 1 to the chain of digits 2; when a third relay is energized, the voltage is returned to the chain of digits 1, and so on. So only a 1, a 2 ^ or nothing can emerge at the left end of the chain. If it is assumed that a perforation of the counting point 8 is read in the card column belonging to the customer b 2, the relay II is energized and its four contacts are closed. At this moment line A is live, but not the other lines B, C, D, as the permutation table shows. As a result, only relay 22 is energized, which closes its holding contact 122 and remains energized for the duration of the machine game. In the chain Ch. 4 there are two more contact chains, one of which, 221, 322, 323, 324, 325. . . 329, which represents the chain for the digits ο, while the other, 221, 222, 223, 224. . . 229, which is the chain for the digits 1. It is evident

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Hch, that the switching of the contact 322 the The purpose is to pass on the tension of the lower chain to the upper chain. Was already a 1 Introduced by the excitation of 21 and the switching of 221, a return of the occurs Tension on the chain, the digits ο as in the previous cases, but this time it is done the transmission, i.e. the occurrence of a voltage on the line 622, via blocking cells,

z. B. 422 522, which allow the passage of current only in the desired direction. The cyclical counting takes place on the basis of 8, which means that the transfer to the higher order 2 or 4 must be provided for the number chain of order 1 and 2. It is possible to compose two successive relay transmissions, one of which comes from the transfer from the line of the digits 0 to the line of the digits 1, while the other occurs in the opposite direction via a common line 622 or 624, etc. In this way, the various relays 52, 53, 54, 55 may be energized each time the value 2 is transmitted. Explanations of the same kind can be made to explain the mode of operation of the chain Ch. 3 controlled by the relays 31 to 39, but with the difference that one operates with the one, that is to say that one adds digits 2, where am left end of the chain a 2 can exit. The transfers are numbers 4 and act on relays 62 to 65. '·

It is only a matter of transferring the data among each other and with the digits of the various binary rows emerging at the left end of the three chains. add up by only adding carries and digits of the same value together. This is done in the same way, but with two small delays of the cam contacts C 3 (closed from point 12V2 to point

14) and C 4 (closed from point 13 to point

14). \

In a first gear, the number 4, which exits from the primary chain of FIG. 4 and is brought to the relay 61, and the numbers 4, which originate for example from the transmission of the primary chain of FIG. 2 and are brought to the relays 62 to 65 , in a secondary. Chain added, from which a digit 4 placed on relay 71 exits. At the same time, the value 2, which can emerge from the primary chain of digits 2 and is transferred to relay 51, and the values 2, which originate from the transmissions of the primary chain of digits 1, are transferred to relays 52 to 55 are added in a secondary chain, from which a voltage representing the value 2 can emerge and which is applied to the relay 77 . The transfers of the value 4, which come from this secondary chain of the value 2, are brought to the relays 72 and 73 and can be added to the value 4 by the relay. 71. A 4 can finally emerge from the tertiary chain of contacts controlled by these last three relays.

In this way, the two numerical symbols are obtained: the first symbol in the form of a possible voltage on one of the lines Li, L 2 and the second in binary representation in the form of voltages on the lines L'i, V2, Z / 4th With the help of the relays 81 to 85, which actuate appropriately switched changeover contacts, lines can easily be obtained, each of which has the digits 9, 8; 7 or 6, 5, 4, 3, 2, 1,0, 11 corresponds. These lines are fed via the cam contact C 5 during the greater part of the play that follows the play of the reading. On the line S one receives two impulses that come from the distributor via different lines and have the same number of reading points, which are divided into two groups by the contacts C 6 and C 7, namely one group for 9, -8, 7 and the other for 6, 5, 4, 3, 2, i, o, 11. These two pulses correspond to a particular letter that can be displayed by any conventional device. The letter obtained can also be compared with the letter symbol on the card by comparing the pulses corresponding to the digits through two relays 79, .. 80. These digits form the combination that arrives at terminal S ' through a second reading of the card, one game after the first. If there is a difference, a voltage picked up in terminal U will stop the machine, actuate a display device, etc.

Although a device has been described in which the code change for three columns repeatedly, other laws of variation can also be used.

This device, as it has just been described, is important because it is intended for testing mixed statements, each made up of letters and numbers, apply leaves, the letters introduced into the device preferably being the same as those above for the columns III, VI, IX correspond to the two-digit code and the permutations described subject in the usual way.

However, for various conditions of use of the machine it may be desirable that all control from a single brush, d. H. in a single game. ' This! case also occurs, for example, in duplicating machines for punched cards, in which in general only one control brush is provided after punching. In machines of this type, the Test device suitable to determine corresponding symbols from the selected number of matriculations and control the registration of this symbol for the punching device of the machine.

For these conditions ■ a second embodiment (Fig. 2a and 2c) will now be described for the test device. Fig. 2 c is exactly superimposed on the upper part of Fig. 2 b delimited by the dash-dotted line A-A'-A " . The various lines Li, L 2, L'i, L'2 ,, L ' ' 4 also fit together exactly, as do the main line and the impulse distributor V der

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Bookkeeping machine stay in the same place.

Furthermore, the lines Li, L2, L'i, L'2 and L ' ' 4 are fed in exactly the same way as in the first Auisführu'ttgsforin the test device, that is, that the current via changeover contact chains from the various cam contacts C 2, C 3, - C 4 reaches them.

The relays 74 to 78 of Fig. 2b are here combined with the relays 81 to 85, which are located directly in the lines mentioned, with the corresponding values for 1 and 2 in the ternary system or for 1, 2, 4 in the binary system the arithmetic base 8 are identified by a single or a double circle below the relay. As in the first exemplary embodiment, these relays control changeover contacts, which here have the number of the field winding with an index letter. In the second embodiment (Fig. 2 c) the chains go to the relays 69 and 90 to 99, which each control a changeover contact of the same number with the index α .

The terminal S'i is connected to the reader bx , which corresponds to the card column of the control symbol to be checked. This customer forms part of the brush, the other customers, e.g. B. & ι to & 9 (Fig. 2 a) can be used at the same time to read the number or matriculation to be checked. The terminal S'i , on the other hand, is provided with the arm of the distributor V which is connected to a relay set 59 and 100-109. This arm runs over the contact pieces P 9 to Po and -Pn at the same time as the perforations of the card column intended for the symbol pass under the reading brush bx , so that for each perforation read a relay 59 or 100 to 109, the straight is connected to the live contact piece, is excited, namely 109 through the perforation 9, 108 through the perforation 8 and so on. Each energized relay closes a holding contact with the index b, which is shown on the left-hand side of the relay fed via the cam contact Cn. Each relay also controls a changeover contact with the index a, which is located on the diagram on the right and in rest. Each changeover contact is connected to the same changeover contact 69 "and 90" to 99 ", which is controlled by a relay 69 and 90 to 99 in such a way that each changeover contact group is controlled by a group of two relays (one from the group of relays 59 , 100 to 109, the other from group 69, 90 to 99) is actuated, which are excited for the same decimal value to be displayed. There are therefore eleven comparison groups, each of which is formed by two relays 99 and 109, 98 and 108 etc. controlling their changeover contacts with the index α. Each group corresponds to a value of 11 or ο or 1, 2, 3 ... 9, the digits of which are in a circle next to the group.

In these groups the relays on the left (59

^: and ioo'bis 109) according to the positions of the symbol registered on the card and the relays on the right (69 and 90 to 99) according to the values of the control system, which are determined by the test calculator when the cam contact C14 is closed.

These values are determined in the following way: If the lines L 1 or L 2 are not energized, that is, if the number is an ο, the contacts actuated by the relays 82 and 81 are in the position shown in Fig. 2 c depicted situation. The voltage is then transferred to relay 97 as soon as contact C 14 closes. The mentioned value ο thus corresponds to a 7. If L1 is energized, the relay 82 closes its contacts 82 _a upwards, and when the contact C14 closes the relay 98 is energized. The ternary value 1 corresponds to the decimal value 8. A similar consideration shows that the decimal value 9 corresponds to the ternary value 2. The second digit symbol, determined by the presence or absence of voltage on the lines L'i, L'2, L'4 , is obtained in the following way:

If a voltage occurs on these three lines, the relays 83 to 85 remain ineffective; their contacts 83 _a and 85 ^ are in the position illustrated in Fig. 2 c, and the relay 69 is energized when the contact C 14 closes. Here, the zero of the second digit symbol corresponds to the decimal value 11. If the line L'i is live, the relay 85 is energized. It closes its contacts 85 _a , 85 _& , 85 ^ and 85 ^ upwards and brings the relay 90 under voltage when the contact C 14 closes via the contacts C14, 83 ,,, 84 _{6, 85 ^.} The value 1 of the second digit symbol corresponds to the decimal value o. It is readily apparent that the values 2, 3, 4, 5, 6 and 7 of the second digit symbol correspond to the decimal values 1, 2, 3, 4, 5 and 6, respectively.

The graphic representation in Fig. 4, which shows the closing times of the cam contacts in one game for 15 points per card, also serves to understand the mode of operation of this device. Line E shows the examination current pulses that emanate from the transmitter EM (Fig. 1) via the contact roller RC of the reading brush.

Ci, C2, C3, C4 are the cam contacts which appear only in Figs. 2 a and 2 b. They work in the second embodiment of the test device as follows: Via Ci, the hold circuit of the computing relay actuates the contact chains; The impulse goes into these chains via C2; via C3 and C 4 are internal transfers.

If one compares the closing times of these contacts with those of Fig. 3, one sees that they are a little longer, which contributes to operational safety.

The closing time of the cam contact Cn covers with the closing time for Ci. The same applies to contacts C 14 and C 4. Through this it is possible, the two groups Cn, Ci on the one hand and C 14, C4 on the other hand, each to be replaced by a single contact.

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As an example it is assumed that the letter N, which in a common code through'die Combination of digits 8 and 3 is expressed simultaneously from the right and the left the peer group is delivered, d. H. that the relays 108 and 98 on the one hand, 103 and 93 on the other

^! on the other hand, when the contact C 15 is closed in the area of the point 14, they are simultaneously excited. From this it follows that at this moment no current can flow via the contacts of the comparison groups, namely io8 _a .and · 98 _a on the one hand and Ίο3 _α and 93 _a on the other hand. So there is no voltage at terminal U.

On the other hand, let us now assume that e.g. the letter N (perforation 8 and 3) on the card as Symbol is read and d> ate the letter P (perforations 8 and 4) by the arithmetic unit of the Invention is delivered. In this case the relays 108 and 98 are energized at the same time, the con-

clocks io8 _a and 9S ₀ are attracted, and the comparison contact group corresponding to 8 does not allow any current to pass. The relay 93 pulls its contact 93 ,, on, while the contact iO3 _e remains at rest. A circuit can be formed via C 15, 93 _O , io3 _a , U. The relay 104 also picks up its contact iO4 _a , via which another circuit of the same type comes about. Incidentally, the principle of this comparison device is known and can be replaced by any other equivalent device.

In duplicating machines where there is only one test brush after the perforation and the test by comparing the punched card with the elements controlling its punching takes place, the test device according to the second embodiment is advantageously used to the Perform test according to the invention.

It is possible that the information to be reproduced that is registered on the base maps is not included Control symbols are provided. It is clear that in this case it is easy to use the test device according to of the second embodiment in a device attached to the duplicating device to convert, which serves to create an automatically generated and registered symbol in the duplication process the information provided in the successive treatment processes of the Card to be checked in the accounting machines, in a special card column too to register. In this other embodiment, the information is provided by the reading bust of the Duplicating device introduced into the apparatus of the invention, and relays 69 and 90 to 99 form part of the storage device or control corresponding electromagnets of the Storage device of the information to be reproduced following the registration of the symbol on the Card match.

Claims (9)

Patent claims: I. Device for checking transmission errors in numerical data entered in the form of markings on a data carrier for automatic accounting machines, which markings are accompanied by a control symbol registered in the same form and are single for digits and double for letters, said device containing two groups ( Ch. 1 on the one hand and Ch. 4, Ch. 3, Ch. 2 on the other hand) which separately and automatically perform arithmetic operations according to the marking values of the indications in order to obtain the value of the two markings of the symbol indicating a letter, characterized in that at least one of the groups mentioned contains several calculation methods (Ch. 4, Ch. 3 and Ch. 2) and that each group receives electrical current impulses according to the position of the indication markings on the carrier according to a predetermined key, which is for two consecutive decimal places as a result of permutations varies, the number of which is possible cher variants depends on the total number of calculation methods in order to obtain an indication of the control symbol in coded form, which is compared with the control symbol marked in the carrier for control purposes. 2. Control device according to claim 1, characterized in that the total number of the assumed variants is less than 4. 3. Control device according to claim 1, characterized in that the electrical current impulses are distributed according to the predetermined key on calculation paths (Ch. 4, Ch. 3, Ch. 2) .according to the binary system and by means of cyclicals carried out on the basis of 8 in the binary system Addition can be exploited. 4. Control device according to claim i, characterized in that the electrical current surges run according to the predetermined key on a calculation path (Ch. 1) in the binary system and are exploited on the basis of 3 by cyclic addition. 5. Control device according to claim ι to 4, characterized in that the. Electric current surges according to the predetermined key on the calculation paths of the two groups (Ch. ι on the one hand and Ch. 4, Ch. 3, Ch. 2 on the other hand) 'by means of relay groups connected in parallel (11, 21, 31, 41; 12, 22, 32 , 42 etc.) are distributed over different lines of each calculation path, whereby each organ for reading information (b 1 to bg) is linked to a calculation element of one of the named paths, 6. Control device according to claim ibis 5, characterized in that the relay groups (11, 21 ·, 31, 41; 12, 22, 32, 42, etc.) connected in parallel from a distributor for electrical current surges (V) through lines (A, B, C, D), the number of which is equal to the number of ■ calculation paths (Ch. 1, Ch. 2, Ch. 3 and Ch. 4), are fed, with the distribution of the electric current surges on the lines. 736/202 C 4240IX / 43 a services depends on the predetermined key and is made by the distributor. 7. Control device according to claim 1, 5 and 6, characterized in that the permutation of the predetermined key is obtained by permanent connections that the calculation relays (11 to 49) for each decimal place of the number to be controlled in different ways, in accordance with the number of the variants, with the feed lines (A, B, C, D) connects. 8. Control device according to claim 1, characterized in that the relays (74 to 78), which give a first representation of the control symbol letter, during a machine game in which the information carrier is read by a first reading station (RC) , the excitation of the display and translator relays (81 to 85) which are used in the next cycle to give a second representation of the control symbol letter and to compare this calculated control symbol letter with the control symbol letters located on the information carrier and read by a second reading station and registered by coded marks. 9. Control device according to claim 1, characterized in that during a single machine game for reading the information of the information carrier, the relays (81 to 85, Fig. 2b), which give a first representation of the control symbol letter, in accordance with the individual elements of this Representation and in accordance with the key of the information carrier cause the excitation of comparison relays (59, 100 to 109 and 69, 90 to 99), which also from a reading device Q) X, V) by reading the marking values of the control symbol letters, which on are registered with the data carrier, in order to indicate the result of the comparison at the end of the machine game. For this purpose 2 sheets of drawings