DE1474057C - Code translation keyboard for business machines - Google Patents

Description

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The invention relates to a code conversion keyboard in that for the formation of a check character and for for business machines, in particular to form the checking of an already existing check of a parity digit for a separate basic circuits on numeric keys in each case Priority series for full keyboards can be set, which requires a large number of components Face number, required by manually pressing the 5. Another disadvantage is that Numeric keys electrical current paths to form the known device because of their relatively large corresponding parity number. Space and space requirements only with considerable For shops equipped with a full keyboard. Difficulties retrospectively in already existing ones machines, such as: calculating machines, machines of modern type can be built in, since in last addition machines, Cash registers or the like, it is io teren due to their modern compact design generally known, the already extremely tight spaces and spaces set on the machine keypad Data on the paper strips that prevail in the "nisse. An installation would therefore come at best Output device provided for the machine (printing in the form of an attachment atn machine housing in werk) by pressing an assigned Ma question, which, however, is not desirable in many cases Express machine control button. 15 is. Yet another disadvantage is that the In many business systems such machines' are called test equipment of the known facility only use to create initial receipts, d. H. can be used on machines that use the j wherever the one exhibited by such machines. Number and the set test character I can then also display printed data in an electronic format. The mentioned test equipment be ^ ! Data processing system for evaluation automatically include the test mark ! .. ■ '■ will give, it is very desirable that the one on the latter not. It is only displayed

Machine keypad set number a parity - the check character difference. '

! "'. digit (check digit) can be assigned. The object of the invention is therefore the

I The assignment of such a parity digit makes creating an improved code conversion keyboard,

I it is possible to do a correctness check for the said 25 which is a parity digit for an entered number

; Number, the expression of which in specially stylized, d. H. automatically forms and prints out and those with relative

machine-readable characters are made, simple and economically feasible means

; if this is done in a known manner by direct and subsequently in full-key field business

! Character recognition devices read and z. B. machines can be installed.

in the memory of a data processing system, this is achieved in that the memory is transferred to another memory for each digit keys belonging to each series of place values. ■ according to their numerical value according to a more-; In such systems, the parity or testing can digit code are formed different, that \ cipher, which is formed per a set of switches with a respective one arbitrary calculation method for the set number after working 35 per priority number, per of the ma- switch Code is provided and where the ■ machine operators can be taken from a table. The parity or check digit can also be operated in different code combinations: generated by a parity digit generator and then set, and that the switches belonging to the same code digits in all j are manually set by the machine operator on the 40 digit series in a keypad. The setting of the individual series connections are connected to their parity or check digit at the same time, outputs depending on the actuated switching sequences, for which the number to be entered is generated on the tern output signals that are set in your machine keypad. Overall configuration the corresponding parity number

Also known is a device for making easy 45 representations.

tion of finding errors in numbers. This is according to a further feature of the invention

Device contains means for forming a check - it is advantageous that the parity digit represents

symbol for a keyed in number, whereby the single digit overall configuration of the output signals

NEN digits of the number can be fed one after the other via numeric keys to a logic circuit, the electro-

i are keyed in and where pressing the 50 magnetically causes the automatic pressing of one of the par

I numeric keys the closing of electrical ac- count digit corresponding numeric key in a

j. clocks for the production of circuits, the correct place value series for parity digits

! after the last digit has been keyed in, the output is initiated.

j total number entered corresponding test. It is also advantageous that the formation and

j generate characters and their display by an additional 55 output of the parity digit of the control of a normal

j set up the appropriate lamp. Possibly ineffective special key can be subject to

j the generated test mark can be printed out. whose pressing the series connections and the

S This known device also contains means for logic switching via a switch to the motor

Γ Checking the correctness of being switched on together with a circuit of the machine.

\ Test characters number set on a full keyboard. 60 It is also advantageous that the row

I By pressing the corresponding numeric keys of the circuits are binary comparison devices that

Full keyboards are arranged to be rotatable depending on whether an odd or even

Contact washers circuits are made effective, where- number of switches in the relevant series-

I is switched on by a lamp indication, the circuit is actuated, corresponding output ''

j. generate the difference to the set test character 65 signals, each of which optionally has one of the

j indicates. By lighting up a zero lamp, the electromagnet is prepared for operation.

indicates that the test mark is correct. It is often desirable that instead of the parity

The disadvantage of this known device is digit formation a parity digit check carried out-

i 474 057

men should be, whereby the operating mode changeover effort. The other features according to the invention as few means and manipulations as possible result from the subclaims. V 'gen should. '; · Wi; ; According to the invention, the code conversion keyboard, which is used to generate a code conversion keyboard with a further feature of the invented parity number, is expediently achieved in that the series connections are connected to the standard full keyboard of a calculating machine by one with them and in such a way that the latter, As already mentioned, switch arrangements connected to the Mqtorstromkreis in 'the way originally designed for it, can be reversed for a parity digit check, ie like an ordinary calculating machine, the overall configuration of the output can, if this should be desired. The standard signals are compared with the value that results in the full-key field of the calculating machine, in general, one digit key for each digit in the manually pressed parity digit key, which is common in the specific series of place values. every row of decimal places. It is advantageous that the mechanism assigned to each number keys contains a grouping by pressing the special key and one of three double-pole electrical changeover switches that can be reversed Separation of the logic circuit of the motor current - each a different combination of the three elekkreis is only closed if the parity digit of the pressed digit key, manually set in the tric switch in the row of keys according to the row of values, is actuatable. . In the set in the other priority ranks following description ^ss H 'are "those number-'entspricht.'^'S ^ i - ^-;? Ao switch a group of overall ^press; invention The above ^ given numeric key can be operated by a bi-V Features and advantages make it possible that the binary "L" is represented: Those switches that are not operated by machine operators in three different operating modes are represented by the binary "0" of each of the three switches represents a binary desired requirement optionally in a simple series of the binary number that can be used conveniently and conveniently and is equivalent to the number key pressed Extend the numeric key for the decimal number 2 in. It is also particularly advantageous to print for a row of keys, then ze If the equation of the machine operations for forming a parity valent OLO of the three-bit binary number indicates that the switch represented by digit and for checking a parity digit the same middle binary value series is used, for which only one ter has been actuated. In the exemplary embodiment corresponding actuation of the special key (s) of the invention are no numeric keys for which decider is required. If the special value is not activated. Zero in the standard full keypad of the key (s), then the machine works in the original machine intended. An associated zero is printed in a designed manner, that is, like any ordinary 35 but always then.in the relevant place value machine with execution of operations for series when no number key is pressed, addition, subtraction, etc. It is also favorable that, has been. The three-bit binary number 000, which indicates when the machine is switched to test mode and that no switch has been actuated, is therefore reserved for the identification of a non-parity between the drawing of the decimal number zero. A set and calculated parity number is determined 40 switches of a group <three switches are connected in series, the machine motor is switched on and a switch of the other group remains, according to the measure by a printout, the parity number would be connected to a mathematical rule, which means the mast which is made aware of the status of V according to the embodiment of the invention .. ~ '' ^ - '^'. V> ^ -. ^ .. "all; binary digits iii the same ^. binary digit-; ·.;. · ; -A machine, a verification test, can determine a 45 series of all of the automatic numbers to be summed up or embedded with an entered, equal three-bit binary number, compares a parity number and, if an odd or even number of binary "L" bits is found, the machine non-parity against further actuation in the binary digit series. After the locks, ^ is already known, but these three circuits are missing in Rei He lying switch known machine and device the versatile 50 each binary digit series for the presence of advantages and features, by which the invention is characterized by an odd or even number of binary in contrast, ^ y; _; ,; ,,, Have compared "" L "bits and found, According to yet another feature of the Eriin- that the number of binary" L "bits in a binary earth is the transcoding keyboard, where each row of digits is odd one, by two numeric keys, different when pressed, the 55 lines at the end of each of the three circuits of the switch-actuating control elements influenced, special series-lying switch with an electrical switch advantageously designed, namely by the fact that potential is charged and through the binary » L «bit the control elements are shown at each end of the holding elements. However, the number of binary is fixed and deformable. "L" bits straight, like that. is the other of the two Lei already known arrangements for code dialing 60 lines charged with an electrical potential keyboards, ^ at; , which-J j generating selection criteria and represented by the binary "0" ^ bit. I §ΐ ^ν : switch by the keys iibjer J shift-, twist- π The device according to the invention also contains sicIkmi or pivotable ^ rails; jiUndv control members magnets, the ^ so? arranged; are; that they can each be actuated. These known arrangements have>, a number key in · a special <number key, but the nightsU, s; that the parts can depress each other 65 row, which must be adjusted for the creationi -. Other disadvantages are reserved for the parity digit ^ is reserved. The operating voltage in the friction and the mass of the moving parts to excite the keys of the parity remote key row assigned to the corresponding keys as well as those required for key actuation

Magnet is coupled via the switches, which have the functions, but these are irrelevant for the invention binary-bit comparison devices for the determination. · Ν, -; ·
the odd number of binary bits. The calculating machine is surrounded by a housing 20, also called a logic coupling, and contains an upper support plate 28, circuitry. In calculating machines with standard full 5 on which the elements of the exemplary embodiment the keypad is normally a; Number arranged according to the invention are printed out on the carrier plate 28 and pressing the motor button down. The full keypad are preferably designed to contain the device of the invention, therefore preferably one that they are removable, making it possible to add additional, normally open switch, which in the calculating machine in a known manner easily series with the power supply and the magnets io to install or remove. The components of the rake is connected and its closing when pressing machine are enclosed by the housing 20, the motor button, takes place. If the normally open switch, as far as these components are closed for understanding the invention, is required by the Iq-, they are described below in more detail only one of the magnet current circuit.

fed. This takes place as a function of which of the six lines at one end of the three as shown in FIG. 1 shows nine rows of keys a, b, c, d, circuits, the series switches an e, /, g, h and 1, each of which is applied to a nine decimal point potential. This will show the series in question. Each row of keys contains nine solenoids, causing the corresponding digit keys 1 to 9, their plastic key, which represents the parity decimal digit, into which key tops 22 each carry the digits 1 to 9 and the pressed position is moved., Da the operation protrude through an upper plate 48. The plate 48 is the magnet runs much faster than the mechanism arranged over the carrier plate 28. For reasons African Druckoperatiori booking machine, it is described in more detail _r below, it is possible that the Päritätsziffer with the can along the numeric keys 1 to 9 set in the row of buttons 1 on the keypad number printed 25 by a removable protective covering 29 abgewerden can . Y will be covered. After the number to be printed

The settings described above and others have been set on the keypad, who--

Details of the invention are set forth below in the elements enclosed by the housing 20

an embodiment on the basis of the drawing during one by pressing a motor button 21

gen described. In the drawings, 30 shows that the printing operation has been initiated. Mission

Fig. 1 is a view of the keypad with one of type rods 88 (Fig. 1), which are preferably with

equipped printing stylized types, then print the

Data input device ίη fine execution numbers set on the keypad to one

example of the device for generating the decimal paper strips 25, which is fed by a paper carriage 89

parity number, although for reasons of better dar- 35 is kept.

position different parts of the Gehäüseoberplatte the known calculating machine, if

are shown broken away: '. "· .. it is converted according to the invention, with a

Fig. 2 is equipped with an on-test button 87, shown partially in section, which sees a series of a part of the numeric keys of a row of numbers pole, individual switch actuated, which in a and various associated organs, 40 housings 91 (FIGS. 1 and 4) are housed, and

Figi 3 is a vertical sectional view from the right to be described in more detail below. The

with a special illustration of the housing 91 being loaded by magnets is preferably on the _x outside

actuatable keys and a conventional printing mechanism, the computing machine housing 20 attached. the

which is provided for each place value series, calculating machine can also use a parity key

Fig. 4 is a sewn view of the circuit of the Ma- 45 95 are provided, which by a further circuit

gneten lind the 'switch, "v;: i. i' / 'ter, which is described in more detail below,

Fig. 5 is a vertical sectional view which can be actuated. The aforementioned switch can indicate the construction site of details of a numeric key, the elements of the invention of the calculating machine can be actuated by the associated magnet, disconnect when the machine is in its original and;: '50 Hch should work as intended.

F i g. 6 a binary encryption table for the: ': ΐν ν _t \

three printing units provided in each of the key shafts

assumptions with indication of the associated three switching When pressing the motor button 21 is a per se

ter in the row of buttons actuated by pressing a known motor start switch 82 (Fig. 4),

Numeric key are actuated. ^: ~ 55 which starts an electric motor 92 (Fig. 3),

The device of the invention is generally in effecting the calculating machine to perform a push operation

a well-known, equipped with a full keyboard, during which the on the numeric keys

Built-in calculating machine. ^{:; ;} set number on the paper strip 25

.vi-v ¹ :; ':: - ·· *'; ^ ':. ':;^;ü'.f ..- .. ",.. ;; ' - '/ ■■:. [■'.. ■■■■ ■ ■ - '■■ - ■'; ■ '. · - ■ Printed''t-'^{^:;}"-.ίΐι; · ίν. ,.: r ■. "■ '■ - ■ ^: · ■■> - ^: '

- /: ^{b :; ri} ^ General 'Description ^{6o in Fig} . 3 the printing unit is shown, each

■ ■: ■ '■■ ( - ■ -; - ■■ = - ■ · i ¹ ' · '·' ·: · ■ ·: · ■■■■ · ■■ '- ^; ' - ■■■■ y ■ "- ■: ■■ ^ ^{; assigned} to the calculating machine for each place value series

F i g. 1 shows one with a typical full key is assigned. For a better understanding of the invention field equipped. Calculating machine, the numbers are briefly explained below, and perform other operations. The number to enter is shown on the full-key calculator is presently a. mechanical 65 field "by depressing the appropriate or electrical device, the characters r numeric keys in the associated key seriesi a or decimal digits on a strip of paper. In the one shown in FIG. 3 is the keypad prints. The machine can also have other radio “number key 8 shown as depressed. By pressing

7. ■■■ ·· 8 ■■ ...

the motor button 21 and thereby swiveled backwards, whereby the individual components closing the switch 82, the motor 92 in the printing unit is returned to its starting position. Gear set, being reset via a suitable gear 94 (FIG. 3). - _v ,

(not shown) a shaft 107, is first rotated in the counterclockwise parity number generator ^ clockwise (Fig. 3). The counter clock 5 _{; ;} Fantatszitterngenerator ^ - ^ pointerdr, ehung the (shaft 107 causes that an arm 111 attached to the keypad adaptable components for one end and an arm 111 attached to the generation of the parity digit are subsequently attached to the other end, the arm 111 ahn- on hand of 1. The key heads 22 of the numeric keys and also swiveling in a counterclockwise direction are made of plastic arm , becomes the same as the rows of keys α to i . However, the keys provided in the key rows / downward direction by the arms 111 are still moved 3 rows α to Λ shown in Fig. are not provided. For understanding position. However, if the bracket 110 is forward in FIG Partly of the keys in the key downward direction are driven by the arms 111, rows α to h thus only the row of keys a so the lever 106 is free and can be described in more detail in the opposite. '; .. clockwise around the shaft 107 under the influence. The numeric keys in the .Kastenlinie α' are with a spring, 108 move, between a pin of their plastic key top 22 on 109 a .Anschlagsstab 104 and a comb 103 20 the Attached to the end of a flat key shaft 23, is stretched. The force of the spring 108 acts on the slidable in slots in the carrier plate

, Lever 106, since the end of the stop rod 104 28 leads. The key shafts 23 are arranged so

is rotatably mounted on a pin 105, which on that its wide flat sides transversely to the row of keys

aligned with an upwardly extending arm of the lever (Fig. 1). In each key shaft 23

106 is attached. Under the influence of the spring 108 25 are in the protruding beyond the carrier plate 28

the stop rod 104 moves in the area in front of three recesses lying next to one another

downwards until, for example, a tooth 104 'provided by 34 a, 35 a and 36 a. The recesses

the key shaft of the depressed number key 34 a are on the motor key 21 facing

23 is stopped. The three-armed lever 106 has side. Through each recess 34 a all

a rearwardly extending arm extending 30 key stems 23 of each key row,

. ".. ■,. Is hinged to -a connecting member 116. The first thin flexible coding member 31 α. Through each

Connecting member 116 is in turn on a pressure of the recesses 35 a is a second thin

• Work rod 118 articulated by means of a pin 117. flexible coding member 32 a and through each of the off-Dürch the counterclockwise rotation of the lever is recesses 36 a is a third thin flexible printing unit rod 118, which is guided in slotted 35 coding member 33α. The coding members 31 a, 32 a guide members 120, 121 leads to a certain and 33 a are driven, for example, from braided nylon stretch. The distance by which the cord is made, the relatively little elongation of the striker rod 104 has moved forward, is determined and has high abrasion resistance. The code also the extent of the downward movement of the pressure members, hereinafter code lines 31a, 32a and work rod 118, which in turn determines, called 4 ° 33 a, rest on suitable webs 38, which are different from the ten number type rods 123 in is set in front of and behind each key shaft 23 on the carrier printing position when a printing plate 28 are arranged. The ends of the coding lines 31a, 32a extending backwards, hammer 125 from its tensioned starting position

) is released. ; ' 'j -I ^ ^ * and 33a are appropriately attached to the carrier-der pruckwerkhamrner 125 * is released, 45 plate 28 with the help of a mounting rail. 39 when an arm 132 is housed on a shaft 133 in the opposite direction, while the front ends of the Coding lines 31a, 32a and 33a are pivoted on individual ones clockwise during machine operation. By means of the counterclockwise pivoting levers 41 of switches “42”, 43a and 44a kung of the arm 132, its pin 134 will be fastened against one. The switches 42 a and 44 a (see also End part of an arm 130 struck, whereby the last 5 ° Fig. 5) are also on the support plate 28 more displaced clockwise about a shaft 131, with their corresponding drive levers 41 is panning. A bracket 128 one of which extends upward from the plate 28. Since the End on the arm 130 and with its other end free ends of each lever 41 higher over the attached to an arm similar to arm 130, plate 28 extending as the top edges of webs 38, moves simultaneously with the arm 130 in front 55 a smooth round metal rail 46 is arranged, outward direction. An intermediate member 127, under which the said lines deflects upwards. the Influence of a spring 129 during the upward movement of the rail 46 is at both ends on the plate 28 Push rods 118 fastened counterclockwise by blocks 47. The coding lines 31a, can be pivoted, in turn moves to 32a and 33a thus normally run in the front in the direction of the pawl 126, which is parallel to the print 60 parallel to the carrier plate 28 between hammer 125 holds in the cocked position. The webs 38 'on the rear area of the number intermediate link 127 causes when it hits the latch button 9 and the round rail 46, which the coding 126 starts up so that the latter surrounds the print hammer 125 overhead lines up to the drive levers 41, whereby the at the end of the in print position., steers.

sensitive push rod 123 intended type against 65. As can be seen from Fig. 1, the Ausnehniun-

the strip of paper is beaten. In the last part of 34 ", 35 a and 36 a in the key shafts 23 two

of the printing operation, the shaft 107 as well as the various shapes. One of the recesses

Arms 111. and the shaft 133 in a 5 clockwise direction is shaped like a crystal, the other is elongated. the

V. ^r '209633/68

9 10

The shape of each of these recesses is determined by being shortened to thereby provide space for accommodating the encryption table according to FIG. 6. How to create magnets 51 to 57 below the upper plate 48 from the table mentioned on the basis of the columns. The »recess« in front of the keys of the key row α. and "key" and the key shaft 23 as seen from FIG. 1 (cf. key row α) can be seen in a simple manner Key shaft 23 above the. circular recess and a binary "0" recess 34a, 35a and 36a is removed; associated with an elongated recess. The digits ^ each have an iron key shaft 26 and a plastic key 2 z. B. the binary code OLO, which indicates that rod 50 are for each of the digits 1 to 7 within their key shaft 23 a circular recess io each solenoid 51, 52, 53, S4, 55, 56 and 57 35 a between two elongated recesses 34 a. The iron shafts 26 protrude slightly and 36 a. The numeric key 7 has as a binary out of the magnetic coils, so that the magnetic code LLL, which indicates that the shaft of this key effect is favored. Since most of the rake includes three circular recesses 34 a, 35 a and 36 a with machines made of hardened steel. There. only eight different combinations 15 key shafts work, the plastic rods can be formed from three-bit binary numbers, 50 can be used as magnetic shielding, is in the present embodiment of the invention the keys "8" and lower ends of the magnets. This Afiörd- "9" is the same as that chosen for keys 1 and 6. It is ensured that when the magnet is energized; would. The reasons for this will be explained in more detail later on when the assigned digit keys are pressed. '' ¹ - ''. Position to be drawn. Would be the magnetic shafts

Since, as can be seen from FIG. 6 results, at least one of the 23 'but made of non-magnetic material heröffnüngeh 34 a, 35 a and 36 a in each of the keys ^ set, such as from <non-magnetic sharpness 23 is circular, a lever 41 is made of stainless steel, so could the non-magnetic keys are placed closer to the coils at least 25 key shafts at one of the three switches 42a, 43a and 44a, driven when a key in the key row is not impressed by the magnets working. As an example it is assumed that would be pregnant. The seven solenoid coils SIbis57 the button 1 is pressed. This takes the in are in a suitable manner below the top plate F i g. 2, the horizontal 48 being supported by a frame 93. The key length part of Codierleiturig31a is tightened and thus 30 row / contains further .Coding lines 31 /, 32 / and is shortened because the circular recess 34 a 33 /, which is formed by recesses 34 /, 35 / and 36 / in the key shaft, the coding line 31a leads and pushes down on switches 42 /, 43 / and 44 / attached. The coding lines 32 a and 33 a are connected. Although this particular characteristic is not required, it remains unrestricted, ie. In its normal way, to generate a parity digit, since the elongated shape is described below, since these element recesses 35a and 36a are not used on their lines when the device is used as parity stirring . It follows that the test device is used when pressing. . '■■■'
Key "1" only actuates lever 41 of switch 42 a. In the following description, we have operated. The lever 41 of the switch 43 a and 44 a those components, the same function may remain unactuated. 40 lead, also the same reference numbers. However, to the

To generate a decimal parity number, individual components of the individual rows of keys

the full keypad shown in Fig. 1 only numbers with clearer; to identify, carry the reference numbers

record up to eight decimal places. This is because of the associated components, such as B. the key

due to the fact that, as will be explained in more detail below23, the coding line and the three switches

wrote, 'the: row of keys / is used to do this, 45 each with a lowercase letter as an index that denotes them

by the parity number for which on the other eight as belonging to the relevant key row α to 7

Rows of keys α to h to generate the set number. identified. So are the reference numbers, for example

It goes without saying, however, that the invention also includes the elements assigned to the row of keys α

is easily adaptable to such machines whose full ^. the index a, the reference numbers for the row of keys b

tastenfeld.with a larger number of keys - 50 assigned elements with the index b etc. in more detail

rows is equipped. · ', ■■. ν marked. .

The additional, briefly mentioned above. .: -.``'...'....-. ·.:.,. _o , .. ■■■■■■,.,: .- '

borrowed features that appear in the row of keys' / before- ;;; ^; _; ';;;;;^;, 8 <* ^8ΐ *> ™ 8? * »8« π »« η:::: \

are seen below with reference to The circuit diagram of the switches is shown at

Fig. 3 described in more detail. The numeric keys 1 to 7 55 hand of Fig. 4 described. There are three switches

the row of keys Ί differ from the others are grouped together and further

Numeric keys of the keypad in that their each have a group of these switches in each row of keys

Key heads 22 are attached to cylindrical, iron, are in the embodiment according to the invention

standing key shafts 26 (Fig. 5) are attached. ruqgsbeispiel a total of twenty-seven switches

Each cylindrical iron key shaft 26 has one. 60 42a to 42 /, 43 α to 43 i and 44α to 44 / provided,

cylindrical non-magnetic rod 50 of the two mentioned switches; are preferably double

can for example be made of plastic. The 1- pole changeover switch, each of which has two / poles

Plastic rod 50 is held coaxially with one of its ends, such as poles 52a and 53a in the

been attached to the iron key shaft 26 while; ^: > Switch 42 a. The two poles ί are characterized by the

the other end of the lever 41 corresponding to a flat key shaft 23 'can be adjusted in two positions,

stirs, the flat key shaft 23, as it is for the as shown schematically in Fig. 4 by dashed lines

Keys of the other rows of keys is provided is very indicated. Is one of the coding lines in a

is similar. The flat key shaft 23 'is, however, relaxed in any of the rows of keys;

■. ■ '■■. '■'. ^: -. ... Il · ■ ■. 12- ■ ...

the associated with this line mechanically connected 42a via the line 97 to one end of a

Bound double-pole changeover switch placed through a non-magnetic coil63 of a relay switch64 .; 'the

- The spring shown in the position shown in Fig. 4 is also a double-pole changeover switch: The stopped, in which the poles 52a and 53a in contact with the end of the magnet coil 63 is not connected to the

, the terminals 54a and 55a of the switch 42a grounded "terminal of the power supply 60 ^; via the hold. If, however, a coding line is taut, normally" closed switches 73 and 95 'are tightened, that is, the associated and normally open switches are energized Switch62 placed, with this line mechanically connected to- In the second series-connected circuit 'switch moved to its other position, in the z. B. nine switches 43 α to 43 / are provided, - with the poles 52a and 53a in contact with the terminals io of the pole 52 / of the switch 43 / both to Erdspahnüng 56 a and 57 a of the switch 42 a go. placed as well as' via a normally open -The double-pole changeover switches are connected to each other switch 66 and the line 96 with the Klemmeh, in the manner shown and form a 54 a and 57 a of the switch 42 a is connected. As already mentioned binary comparison device for even and odd, the switch 42a belongs to '/ defri ciffrige values. In the yergleichsvorrichtuhg there are 15 previously described first circuits. . nine each representing a binary digit series at the other end of the second in series; schal switch 42a to 42 / provided in series so ended circuit are terminals 55a, and -SOa'des are connected to each other that the pole 52 / - switch 43a via a line 99 to a first of the switch 42 / via a normally closed pole 67 of the relay switch 64 is connected. The single-pole single change-over switches i58 are applied to the switch 43 by groups 54a and 57a ^! Connected via the ground potential to a line 96 connected to both terminals 54a and line 98 with the riv-second pole-oe-es-relay-57α of switch 42a. ^{!: M::} ~ J ^{r ';} Vf ^{11: 'ϊιί;} "will Sj if an even number of switches · ^*.'; A third in; series-connected circuit is ^f Erii> operated 'in this row of keys, however, a T» Senior Citizen ^{new. "Ski} Age ¹ 44e ^: 'bisv44ii'wpber_äer Pol 527 odd number of switches in button row 25 of switch44 / both with the ungrounded: actuated, the earth potential comes to a line terminal of the power supply 60 as well as with; the 97, which is connected to both terminals 55 a and 56 a of the switching line 98 is connected via a normally open switch 42a; This is achieved by having ter 71 connected. The line 98 belongs, as mentioned by the pole 52 a of the switch 42 a with both terminals, to the second circuit. Are most änmen 54b and 576 of the switch 426 and the ΡοΓ30 deltn end of the third series circuit are the two terminals 53a and 56 b 556 of formwork clamps 55a and 56a of the switch 44a via a ters42ß etc. are connected (Fig. 4). Line 101 and a normally closed switch. The nine switches 43a to 43 / represent a further switch 74 with one end of the four magnetic binary digit series connected in the same manner to coils 54, 55, S6 and 57. The terminals are arranged. With these switches, however, 35 54a and 57a of switch 44a are connected via the line to the ground 75 applied to pole 52 / of switch 43 / via a normally closed switch 59 to one end of the three Magnetic coils 51, potential connected either to a line 98 or 99, and 52 and 53. The line 100 also leads, depending on whether either an even, via two normally open switches 8i / and 82 or an odd number of switches in the 40 to a conductor 92 'of the ElektroiriötQrsi92 (Fig. 3 relevant row.., And 4), which sets the drive for; the; mechanical:; TBe-The nine switches 44a to 44 / one more movements the machine delivers, pie; ^; .Line92'3es /

Ö \ binary value series. With these switches, ejector prompts 92 is usually via a

J but overall e reached the / desi .Schalters 44 / ^^ closed container 83i and riormäie, rwei to the \ Pöl 52? \

Via three normally closed switches 72, 45, switches 82 with the ungrounded terminal opened

73 and 95 'and a normally open switch- the power supply 60 connected in series, pie ani-

The potential applied to the power supply line ^ of the motor 92 is connected to earth. I JiV ';

either to a conductor 100 or 101, namely in, via relay switch 64 forms part of the Ipgi-

Depending on whether an even or odd ..... see circuit that determines which dejr / seven

- Number of switches is operated, ίΐί F.igl4 5 ° solenoid coils 51 to 57 are to be excited. The relay only has twelve of the switches, namely the switches 42a, schalter64 has four terminals 77 ,; 78, 79, and 80. 42b, 42h, 42 /, 43a, 436, 43A, 43 /, 44a, 44b, 44h The terminals 7T ₅ and 79 form contact closure with and 44 / shown. The other fifteen switches are low-contact at poles 67 and (68, we, nn ', die'Magriet- ^: schematically indicated.., ■, Γ? - · coil 63 not energized Jst. If solenoid 63

For the twenty-seven switches 42 a to 42 /, 55 excited, so, the poles 67 and 68 put contact in the middle

43ά to 43 / and 44a to 44 / there are further connections .Klemmen 78 .and 80. The other ends of the

. ties. The switching of these switches is based on solenoids 52. and 56 are connected to terminal 77

described below. These connections are connected while the other ends of the magnet

'run as follows: In the first in series _f - coils 53 and 57 are connected to terminal 78. the

. the circuit of the nine switches ^ ■ 42 <j; to 42 / is 60 other ends of the solenoids 51..and -S.5-. are closed *

the pole 52 / of the switch 42 / to a ground voltage. ,the. Terminal i80 led.-That. .-other. E ^ nde 4er'Ma - ^ -.

; appropriate power supply ^ 60 placed. However, the magnet coil 54Jst mentioned is only connected to the terminal 79

ί ^ Ppi 52 / of the switch 42 ^; is furthermore, with the; not round a solenoid 50, in IFi g. 4, through

j earthed terminal of the Strpmyersorgungs60 in rows of dashed lines, indicated and still functional

over two normally open. Switches 61 and 62 65, described later, could: if necessary, between

and normally; closed switch, 95 ', see line 100 and between terminal 79

connected. At the other end of the first power will be applied. . >

circle are the terminals 55a and 56a of the switch. The circuit according to FIG. 4 enables the

13 14

Calculating machine in three different ways to ar- tials to the other of this further group of ma-

work. In the first type the machine can be used in the gneten when the number of actuated

work for them originally designed way. In switch is odd.

of the second type it works in such a way that the machine in its third type, i.e. H. as a parity digit is generated. In the third and 5 parity digit checking device work, then the The last type can be any, on the key parity key 95 pressed again and in the pressed field The number entered on the machine is latched to the parity position. The test button 87 will also test. If the adding machine works in its first position, if pressed and latched in the pressed position, d. H. original way of working, so is the parity. By pressing the test button 87, the switches button 95 in its upper unpressed steljung. Also io 61, 66, 71 and 81 closed and the switches 58, the test button 87 is open in its upper unpressed 59, 72, 73, 74, 75 and 83. The eight mates Position, thereby ensuring that the gneten 50 to 57, the relay switch 64 and the Switch 83 is closed. The switch 95 'is solenoid 63 but are now electrical from the switch opened so that the circuit is disconnected from the circuit. The power supply for the electric adding machine is separated. Power is supplied to motor 92 by pressing motor button 21 the motor 92 takes place via the switches 83 and 82. via the switches 62, 95 'and 61 and the first

If the machine is to work in the second way, i.e. i.e., circuit. If the number of actuated switches if it should generate a parity number, the parity in the first circuit is even, current is over button 95 pressed and through a suitable organ the line 96 and the switch 66 to the second . on the housing 91 in the depressed position yerkickt 20 circuit laid. Is the number of actuated (Fig. 4), so that the switch 95 'is closed. will hold. The test button 87 remains in its upper one. then power is on line 98 and the switch position. The eleven switches 72, 74, 81, 75, 71, 59, 66, ter 71 are connected to the third circuit. Is also 58, 61, 73 and 83, which have already been described above, in the third circuit the number of actuated were housed in the housing 91, 25 switches straight, then power is still on the take the in F i g. 4 positions shown, d. i.e., line 100 and switches 81 and 82 to the that the switches 58, 59, 72, 73, 74, 75 and 83 are connected to the electric motor 92. It goes without saying that if closed and switches 61, 66, 71 and 81 closed. any one of the three series-connected currents opens are. circle an odd number of actuated switches

If the parity key 95 is in the pressed position 30, the circuit to the electric motor 92

Position and the test button 87 in the upper position, cannot be established,

this is how the parity generation circuit works

digit in the following way. The first in series formed according to the invention. Embodiment are the

connected circuit of switches 42a to 42 / meets the three switches 42 /, 43 i and 44 / in the same way.

Selection of which group of four magnets to be created, such as switches 42 a to 42 h, 43 a to 43 h

rain is because this circuit is dependent and 44a to 44Λ, although the pole 53 / each switching

whether the number of actuated switches in these 42 /, 43 / and 44 / is not associated with them

sem first circuit is odd or even, which are.

Magnetic coil63 of the magnetic switch64 energized or ". __. . ... ._, ... . ',

not aroused. If the number is odd, then contains the 4th digits of a decimal frame digit for a number.

selected group the four magnets 51, 53, 55 The operation of the keypad and those in and 57. If the number is even, the device adapted from FIG described below. First is the Pari-56. The second series-connected circuit of the number key 95 printed and in the pressed position switch 43 a to 43 e limited the latched by the first 45 ment. The test button 87 remains in its circuit made numerical selection of the upper position. If supposed to be a number, magnets from four to two magnets, since the second z. B. 542 361, on the keypad of the machine a circuit is determined to which of the two are adjusted, then the key "5" of the key groups of magnets 50, 51, 54, 55 row /, the key "4" of the Key row e, the key or 52, 53, 56, 57 the earth potential is to be applied; 50 »2« of key row d, key »3« of key ■ The ground potential is to be applied to the first of the mentioned row c, key »6« of key row 6 and the groups of magnets 50, 51, 54 and 55 Key »1« of the key row α pressed. Place the table when the number of actuated switches in FIG. 6 shows that the key shaft of the second circuit is straight. The application of pressed number key "1" has a circular external earth potential to the other group of magnets 55 mung34a. If the number key "1" occurs when the number of actuated switches key row α is pressed, only the line is odd. causes a further limitation 42 a actuated and the poles 52 a and 53 a of the switch of the numerical selection of the magnets from two to 42 a in contact with the terminals 56 a and 57 a one of the eight magnets, since the third series current 6 ° are brought. If the number key "6" is used to determine which of two other groups is pressed next row of keys 6, this has the effect, as can be seen from the table above, of magnets 50, 51, 52, 53 or 54, 55, 56, a tensioning "57 the ungrounded potential of the power supply of lines 326 and 336. As will be remembered, are to be applied like the keys of the row ά. The number signs 50, 51, 52 and 53 are applied when the number key "6" of row 6 has thus according to the table in the operated switch in the third circuit Fig. 6 circular recesses 356 and 366. straight The application of the ungrounded potential- From this it follows that the poles 526 and 536

15th 16

Both switches 436 and 44 ft in contact with the third circuit of the nine switches 44 a to 44 / their corresponding terminals 566 and 57 ft have been actuated, the ungrounded Potenp. men. If the number key "3" of the key row c is pressed in relation to the power supply on the line 101, the lines 31c and 32c are connected and a current circuit is closed over the magnet 57, whereby the poles 52c and 53c of both circuits. S sen. By energizing the magnet 57, the ter42e and 43c (only schematically in; Fig. 4 de-iron shaft 26 (Fig. 3) of the numeric ^{key "7" E of} the hold) their corresponding terminals 56c and 57c key row i downwards into the touch the depressed position. They are moved in a similar way. When the electric motor 92 initiates the printing operation for the coding lines in the other rows of keys, the digit "7" is clamped together with the, if the remaining digits are placed on the digit "542 361" and "2" on the paper strip, »4« and »5« of the key rows d, e and / 25 are printed out as »7 542 361«, with keyed in between the. The two "7" and the "5" of the number on the right become one pole of each switch 43o * (for digit key "2"), 42 / double space is present. ν i; _f i

and 44 / (for number key »5«) and 44 e (for .Numbers- If other numbers are used on the keypad of the

button »4«) is actuated and form a contact closure with 15 calculating machine is set, so are also ^{corresponding:} their corresponding terminals: 56d and SId, 56e speaking other parity digits through the device and 57e or 56 / and 57 "/. Since in the Sequence of keys is calculated when the motor key 21 is pressed g, h and / no keys have been pressed, will remain, after which a printout also takes place, the switches 42g, 43g, 44g, 43 h, 44 h, 42 h, Ali, As already mentioned, determines the circuit according to 43 / and 441 in the position shown in Fig. 4. Since ao Fig. 4, depending on which of theyerschieder switch 62 during the time when the number 542361 which twenty-seven switches have been operated on the keypad of the If the machine is set, which parity digit is opened along with the one, the circuit has the additional given number-is printed.If as a further advantage, no flow through any of the example the number 7 542361 on the key nfeld one twenty-seven switches 42a to 42 /, 43a to 43/25 are set, except for the switching and 44a to 44 / flows when they are operated. Data in the key rows α to / additionally the switch; by prevents a spark gap ter 42 g, 43 g and 44 g in the row of keys g actuated, forms between the contacts. The parity number is The actuation of the switches of the key rows α to / thus not yet set in the key row / wor- takes place in the same way as is already described for keying in the number 542 361, although the circuits are prepared for this once the power was turned on by pressing the motor. If the motor button 21 is now pressed, a button21 is switched on. \ To cause the number to be printed out, a.

The number is now ready to be printed out. Potential difference between line 100 and the when power is applied to the circuits. Terminal 79 formed in relay switch 64. Since the test key 87 is in the upper position 35, the calculating machine is preferably designed (Fig. 1 and 4) and the parity key 95 is in their that an associated zero is printed if no pressed position (Fig. 4), so the push button in, the row of buttons in question is pressed, operation is generally triggered by pressing the motor and since the machine in a suitable manner also button 21 (Fig. 1). The switches are changed so that the printing of 62 and 82 required is closed, since they are connected to the motor key 81 via a suitable keys of the key row / back linkage 84 which control 40 zeros. The rod 84 can only be dispensed with schematically by the dashed line example. · Is the lines in Fig. 4 shown. In order to ensure that the calculator is designed in such a way that the switch 62 remains closed long enough that a number key must be pressed in order to insert a zero associated with a magnet-operated number key. hl to set the parity number, so that 50 must be included in the circuit, express it together with the keyed number, ^ The solenoid 50 can be designed so that it is bar, the linkage between the motor key can through it another iron key shaft in Downward '21 be designed so that the switch 62 can still be moved in the direction of movement, thereby closing the number key in front of the switch 82. Since magnets generally move in a similar manner to the depressed position but work many times faster, as is the case with other solenoids than mechanical linkages, this feature can be seen in 51 to 57 and the magnet is made to a button, some Exemplary embodiments of the invention to be depressed. Since none of the number keys "1" to be required. Since three switches 42a, 42c and 42 / in "7" have been operated by the magnets, the number of switches 42a to 42 / "appears in the first series-connected circuit of the nine 55 in the example given above. "0 7 542361" on the paper strip 25, with the same device indicating that an odd number between the zero and the first digit, namely the number of binary "L" bits are under comparison), digit 7, a space of one Sign in front of a circuit through the solenoid 63 is available. that one of the numeric keys of the key 85 (only shown schematically) is pressed in series / accidentally or unintentionally during the generation by the poles 67 and 68 of the relay switch 64. Since a parity number is pressed, this represents three switches, namely the switches 43 b, 43c and 43 d ensure that the correct .Parity number is generated in the second circuit of the nine switches 43 a to 65 The sequence described above, briefly together-43 / have been operated, the line 99 and summed up, it shows that if the sum of the binary the pole 67 of the switch 67 is connected to earth. Since there are three "L" digits in the binary word digit rows, the switch, namely switches 44 b, 44 e and 44 / in, is evenly matched by switches 42a to 42 /,

Claims (1)

17 y / 18th the circuit can be excited via the switches to the solenoid 50 to 57 if a test opera-63 is not closed. If the sum of the binary tion is in progress, since the "L" bits mentioned are then odd, however, the circuit of the coils from the circuit is closed by the relay coil 63 being pressed in. If the total position test button 87 is disconnected,
of the binary "L" bits in the switch 43a 5, however, if one of the digits of the binary digit series entered to 43 / would be even, the number would be wrong, ie if, for example, the earth potential would be via the series circuit of the digit on the far right "1" (in which the mentioned is placed on the conductor 98, which is erroneously coupled to the Zif relay switch 64 with the pole 68 at the th number "2 654621"). However, if the sum fer "7" is pressed in the row of keys α, then the binary "L" bits would be odd, so the earth instead of switch 42 a in the row of keys α is now potential via the series circuit "η the line the switches 42a, 43a and 44a of this row of keys 99 are placed, which is coupled to the pole 67 of the relay switch 64 (and also the other switches 42e , 43b, 43c, 43 /. In the remaining binary value row 43 /, 44 c, 44 d, 44 e and 44 /), which, if the sum of the binary "L" bits, circuit to the electric motor 92 remains open, if is, through the series circuit of switches 44 a to 15, the motor button 21 is pressed. The circuit under 44 / the potential of the non-grounded terminal of the motor 92 can thus be ^ not closed, 60 44a because the parity digit "2" set power supply from the pole 52a of the switch for the number "654627" to the line 100th However, the sum is not correct. This allows at least one of the binary "L" bits to be odd, so the potential of the three series circuits has an odd number of switches actuated on the line 101. ?; C ao, whereby the printing unit in n ^; "i ^: " · ^!! L j 'vl'-''- τ Ui is an inoperative state, thereby preventing a printed number from being checked and an incorrect number being printed out. Very often it is desirable that a number provided with a par since three coding lines for each row of keys are prefixed digits from one record, only eight different decimal carriers are to be transferred to another. The 35 parity digits 0 to 7 are available. As already mentioned, the circuit shown in Fig. 4 is light and in one therefore the recesses 34a, 35a and 36a can be changed in a fan-like manner so that they work as parity digits of the numeric keys "8" and "9" of the key row α at test device. A test circle is formed in such a way, for example, in the same way as that produced that the test button 87 is pressed and the recesses 34 a, 35 a and 36 a of the digit parity key 95 held in the pressed position 30 keys "1" and " 6 «of this row of keys. This will be the same. The test button 87 is in the depressed formation of the recesses was therefore selected ge position by a suitable member in the housing 91, since the embodiment of the invention in (Fig. 4) held latched. The test button 87 can be used in a special business system, by means of a suitable linkage 94 (in FIG. 74, 81, 75, 71, 59, 66, 58, 61, 73 and 83 combine an "8" with a "1", a "9" with a "1" or linked so that these switches can be operated together in reverse to be confused is very small.
are. Seven of the switch, namely the switch 58, I 73 74 _n some applications of the invention, at 59, 72, 75 and 83 are closed, during which, however, the probability of false the four switches 61, 66 are opened 71 and 81 , 40 digit recognition is the same for all digits when the test button 87 is in its upper position. If the ¹ test buttons 87 are printed, then all of them will be seen in order to provide a precise definition of the poles of the eleven switches 72, 74, 81, 75, 71, 59, 66, 58, for each digit and Thus, to obtain the desired reliability 61, 73 and 83 downwards through the linkage 94 degree of reliability in the error check, so that the seven closed switches would now, for example, be four more coding lines opened and the four open switches ge - Are closed by three coding lines in each row of keys. At the same time as the test button is turned, then four switches 87 would have to be pressed; the cover 29 will be provided in a suitable manner for each row of buttons! Cleared in a neat way so that the number keys of such a system would then be two rows of parity number keys 1 exposed. 50 digits required, because sixteen non-identical debits, for example the number "2 654621", can be generated above parity digit combinations. If, as can be seen, the number "2" is already seen from the fact that instead of the three series scarf leads as a parity number, the number mentioned is set to four such circuits for the Verdem keypad. This is done by avoiding the binary code that would have to be pressed by pressing the key "2" of the key row /, but these four series connections would work in the same way as key "6" of the key row /, the key "5" the more like with three circuits, d. h, row of keys e, etc. Again, depending on whether an even or odd number of the twenty-seven switches 42a to 42 / is correct, the number of switches operated by the buttons on the keypad 43a to 43 / and 44a to 44 / , when the number of the calculator is actuated the number set on which the keypad is set. In the present 60 den is. η ι.
Case the following switches are operated: 42a, 42e, claims: -;
43 6, 43 c, 43 /, 43 /, 44 <cV Md, 44 e and 44 / .. With the 1st code conversion keyboard for business switches located in this setting, in particular for forming a pari (it should be remembered that the key 87 is pressed), the number of digits is closed for one on numeric keys in individual the circuit to the electric motor 92, 65 place value series with full keyboards adjustable when the motor key 21 both switches 62 and 82 number, whereby by manually pressing the digit closes, whereupon the set number is printed out remote keys electrical current paths to the formation of the will. It should be mentioned that none of the parity digits corresponding to the solenoid coils are closed, characterized in that the to. number keys "(" 1 "to" 9 ") belonging to each place value series (α. to i) are designed differently according to their numerical value according to a multi-digit code, so that each place value series (e.g. α) has a switch set (ζ. Β. 42 α, 43 a, 44 a) each with a switch (z. B. 42 a) per code (z. B. 34 a) is provided and the individual switches can be operated by the number keys pressed in different code combinations, and that the switches (ζ. Β. 42α, 426, 42c ... 42 / ') belonging to the same code positions (e.g. 34 a) in all series of places (α to /) are connected in individual series connections (Fig. 4), on whose outputs (96 to 101) output signals (e.g. "0" or "L") are generated depending on the actuated switches, which in their overall configuration represent the corresponding parity number! ao ; 2. Code conversion keyboard according to claim 1, characterized in that the overall configuration of the output signals representing the parity number of a logic circuit (63, 64, 67, 68, 77 to 80, 85, SO, 51 to 57) can be fed _a5 , which is electromagnetically ( 50, 51 to 57) causes the automatic pressing of a digit key corresponding to the parity digit ("1" to "7") in a certain (/ ') of the place value series (o to i) for parity digit output. 3. code conversion keyboard according to claim 2, characterized in that the formation and Output of the parity number of the control is subject to a normally ineffective special key (95), at. whose pressing the series connections (Fig. 4) and the logic circuit (63, 64, 67, 68, 77 to 80, 85, 51 to 57) via a switch (95 ') to the motor circuit (60, 62, 82, 92) of the machine can be switched on. 4. code conversion keyboard according to claim 2 or 3, characterized in that the series connections (F i g. 4) binary comparison devices are that depending on whether an odd or even number of switches (e.g. 42 a to 42 /) are actuated in the relevant series connection, corresponding output signals generate each one of the electromagnets (50 to 57) for actuation prepare. 5. code conversion keyboard according to one of claims 2 to 4, characterized in that the Series connections (Fig. 4) by one with them and with the motor circuit (60, 62, 82, 92) - connected switch arrangement (58, 59, 61, 66, 71 to 75, 81, 83) can be reversed for a parity digit check, whereby the overall configuration the output signals are compared with the value that is determined by a parity digit key printed manually in the specific place value series (/) (»1« to »7«) results. . 6. code conversion keyboard according to claim 5, characterized in that the switch assembly ■ tion (58, 59, 61, 66, 71 to 75, 81, 83) can be reversed by pressing the special key (95) and another special key (87), with the logic circuit (63, 64, 67, 68 , 77 to 80, 85, 50, 51 to 57) the motor circuit (60, 62, 82, 92) is only closed if the parity number set manually in the place value series (/) corresponds to that in the other place value series (α to H ) corresponds to the number set, corresponds to. 7. code conversion keyboard according to claim 6, characterized in that normally certain Switches (58, 59, 72 to 75, 83) closed and certain other switches (61, 66, 71, 81) of the switch arrangement are open, their switching together by a with the another special key (87) coupled rod (94) takes place. 8. code conversion keyboard, in particular according to claim 1, wherein each numeric key when Pressing different, the switch-actuating control members influenced, characterized in that that the control members (31 to '33) attached at each end to holding members (39, 41) and are deformable. 9 ^.: Code conversion keyboard according to claim 8, characterized in that the control members (31 to 33) are optionally deformable so that their effective length can be changed by the number keys influencing them. 10. code conversion keyboard according to claim 8 or 9, characterized in that the control members (31 to 33) consist of thin flexible lines, which with their one ends on a fixed rail (39) of the holding members (39 ^ 41) attached and with a single Actuating member (41) for a switch (z. B. 42b) of the switch set (42 b, 43 b, 44 b) assigned to them at their other ends are connected, and that the flexible lines (31 to 33) between the keys that actuate them rest on fixed bars (38,38 '). ^J ■ - 11. Code conversion keyboard according to one or more of the preceding claims, characterized characterized in that the shaft (23, 26) of each digit key of each place value series (α to /) designed differently to influence the corresponding control members (31 to 33) is. '- 12. Code conversion keyboard according to claim 11, characterized in that the keys coding holes (34 to 36) are provided in the key shafts (23, 26). ^ν:;: · ^:: '': ν · ^{'5: ί :;} ; ';:;^ν;;; 13. Code conversion keyboard according to one or more of the preceding claims, characterized characterized in that the switches of each switch set (e.g. 42 a, 43 a, 44 a) are double-pole Toggles are. 1 sheet of drawings