US2502919A

US2502919A - Accumulator for accounting machines

Info

Publication number: US2502919A
Application number: US669258A
Authority: US
Inventors: Brand Samuel; James M Cunningham; Leon C Bishop
Original assignee: International Business Machines Corp
Current assignee: International Business Machines Corp
Priority date: 1946-05-13
Filing date: 1946-05-13
Publication date: 1950-04-04
Anticipated expiration: 1967-04-04

Description

April 4, 1950 SBRAND ETAL 2,502,919

ACCUMULATOR FOR ACCOUNTING MACHINES Filed May 13, 1946 5 Sheets-Sheet 1 ATTORNEY Apri14, 195o Filed May 13, 1'346 S. BRAND ET AL ACCUMULATOR FOR ACCOUNTING MACHINES 5 Sheets-Sheet 2 E 5'/ IIIII Illu April 4, 1950 s. BRAND Erm. 2,502,919

ACCUMULATOR FOR ACCOUNTING MACHINES Filed May 13, 1.946 I 5 Sheets-Sheet 3 April 4, 1950 s. BRAND ETAL 2,502,919

AccUNULAToR FOR ACCOUNTING MACHINES Filed May 15, 1946 5 Sheets-Sheet 4 Apri14, 195o s, BRAND ETAL AccuMuLAToR FOR ACCOUNTING MACHINES' 5 Sheets-Shea?l 5 Fiied May 13, 134e M m u wwwa@ n w www m w wm ,o n Nmsc w lMfN .A AMM Q L nw Sm EN l* Dwnw UW@ w #Nm l! Patented Apr. 4, 1950 UNITED STATES PATENT OFFICE ACCUMULATOR FOR ACCOUNTING MACHINES Application May 13, 1946, Serial No. 669,258

5- Claims.- (Cl. 23S-61.6)

The present invention relates to record cony trolled calculating machines and more particularly to the accumulating mechanism thereof.

The principal object of the invention is to provide an improved accumulating structure in which two amounts may be concurrently entered to obtain their sum or difference.

A further object of the invention is to provide improved tens carry control devices responsive to concurrent entries in an accumulating structure of the type specied.

The accumulator of the present invention comprises a series of denominationally ordered adding wheels each having twenty rotative positions, each of which has diiferential gear connection to a pair of entering wheels. The latter are separately advanced differential extents, concurrently, to receive two amounts and through the differential gear connections the adding wheels will accordingly be driven to represent thereon the combined advance of the related pairs of entering wheels. Such advance takes place during the usual entering portion of an accounting machine cycle. Contacts set by the adding Wheels are effective during the later carry portion of the machine cycle to cause a step of advance of one entering wheel of higher order or a step of advance of both entering wheels of higher order to thereby advance the higher order adding wheel one or two steps, depending upon whether there is a single or double carry required. i

Other objects of the invention will be pointed out in the following description and claims and illustrated in the accompanying drawings, which disclose, by Way of example, the principle of the invention and the best mode, 'which has been contemplated, of applying that principle.

In the drawings:

Fig. 1 is a side elevation of the dual accumulatins unit.

Fig. 2 is a detail of the readout structure'.v

Fig. 3 is a detail of part of the carry mechanism.

Fig. 4 is a central section through the accumulator taken substantially along lines 4-4 of Fig. 6.

Fig. 4a is a section taken on line 4a;4a' of Fig. '4.

Fig. 5 is a detail of one of the drive clutch devices in operative position.

Fig. 5a is a viewsimilar to Fig. 5 with the'devices in inoperative position.

Fig. 6 is an end elevation looking from the lett of Fig.' .1 with' the central structureshown in section.

Figs. la and 7b taken together constitute a Wiring diagram containing the necessary elements for operating the accumulating structure.

Fig. 8 is a timing diagram of the related cam controlled contact devices.

Referring to the drawings, I0 represents the main drive shaft which, through suitable gearing not shown, drives card feed rollers represented diagrammatically at I I in Fig. 7b, so that a record card C is moved past a row of sensing brushes LB for each revolution of shaft I0. The record card C is provided with the usual rows of ten index point positions wherein perforations are made to represent amounts. To obviate a detailed' explanation of the well known card feeding mechanism, it will be assumed, for the purposes of the present invention, that the record card C is initially brought to a position as indicated in Fig. 7b with the brushes LB in readiness to traverse the card, and that the shaft I0 is thereafter turned through a single revolution. This revolution is represented on the time chart of Fig. 8, which indicates that the cycle is subdivided into sixteen so-called index points during which several cam controlled contacts operate during the periods indicated by heavy lines in the diagram.

Shaft IIJ has secured thereto two drive gears designated I 2L and I2R (Fig. 6) for each denominational order of the accumulating mechanism. These two gears drive similar adding devices which will hereinafter be distinguished as the left and right sections of the accumulator.

Referring to Figs. 1, 5 and 6, gear I2R drives gear I3R through the ratio of 16:10. This gear I3R is integral with a ratchet I4R freely rctatable on a sleeve I5. Lying in the plane of ratchet IIIR is a dog IGR which is pivotedat IIR to a notched detenting disk IBR engaged by a springpressed detenting lever ISR to iin-'- positively restrain the disk against rotation. Between dog ISR. and disk IBR is a toothed disk 2DR freely rotatable on a hub of ratchet IIR. A camming surface 2Il'1l of the disk 2BR engages a pin 22R in the dog IBR. to hold the dog out of engagement with ratchet MR, as shown in Fig. 5a, wherein disk 2BR is shown displaced clockwise with respect to disk IBR, a spring SR extending between the free end of dog IBR and disk I BR tends to urge disk 2BR in a counter clockwise Adirection against which the disk is normally restrained by a tooth on lever 23R, whichl engages "aftooth in the disk as indicated in Fig. 5a. When lever 23R is rocked out of en'-rv gagernent with the disk, the latter will rotate counterclockwise to the position of Fig. under the iniiuence of spring SR, causing the dog IBR to engage the ratchet for driving action thereby. Thereafter, if lever 23R is rocked back to its position of Fig. 5a, it will engage one of the teeth of disk 2DR to hold it while the ratchet continues to drive disk I8R through the dog IER. This relative movement of the two disks will cause the camming surface ZIR to rock the dog back to the position of Fig. 5a, wherein the parts will remain until lever 23R is again rocked downwardly. The detenting lever ISR will hold disk I8R against movement until the clutch connection is again eected.

Referring to Fig. 1, the lever 23R is pivoted to a rod 24 and has a bifurcated extension engaging the free end of an armature B, extendingvbetween a start magnet designated STR and a stop magnet designated SPR. Energization of magnet STR will rock lever 23R to the position of Fig.

.5, where it will be held by a detenting lever 2BR,

and energization of magnet SPR Iwill rock it back .to its initial position. The disk I8R has ten rotative positions and through the successive operation of the start and stop magnets can be ad- 'vanced from any of these positions to any other.

Thus, if the disk is to be advanced, let us say four steps, the start magnet STR is energized and rotation of the disk commences. When it has advanced four steps, the stop magnet SPR is energized to effect uncoupling and the disk will accordingly come to rest after having advanced ltour steps.

The gear I2L (Figs. 4 and 6) through an exactly similar set of clutch connections drives a disk I8L under `control of a second pair of start and vstop magnets designated STL and SPL. The parts associated with this second clutch mechanism `are identiiied with the same reference characters followed by the sufiix L, while the corresponding parts have the sufilx R for the rst or right hand clutch mechanism.

Referring to Figs. 4 and 6, the disk I BR has integral therewith a gear 21R while the disk IBL has a similar gear integral therewith designated 21L. Between these two gears is a carry disk or wheel designated secured to sleeve l5 and provided with an opening in which a pair of pinions 3| and 32 are mounted.- The manner of mounting pinions 3l, 32 is shown in Fig. 4a where it is seen that the pinions mesh with one another within the opening in wheel 30 and extend outwardly in opposite directions to mesh with gears 2'IL and 21R whose relative location is indicated in dotted lines in Fig. 4a. To support the pinions in the wheel 30, straps 30a are provided which extend across the opening on opposite sides of the wheel and carry the pivot studs of the pinions. The ratio of gear 21R to its pinion 3I is 2 to l. However, as is well known, the particular ratio is immaterial and is chosen here for convenience of manufacture. The gears 'and pinions comprise a well known type of planetary gear structure, whereby advance of either disk I8Ror IBL will advance disk 3U a proportional amount, that is, if either disk I8R or ISL is advanced a full revolution, disk 30 will be advanced 'a half revolution and, if both disks I8R and IBL-are vadvanced a full revolution, disk 30 will advance a full revolution. Disk 30 is thereby advanced to any one of twenty rotative positions an amount representing the sum of they advances of the two disks I8L and I8R. Assume both gears ZTL and 21R turn a full revolution together. As a result,v pinions 3I and 32 do not rotate on their airesfbut their axes rotate about the center of gears 21R and ZTL, carrying along disk 30. In other words, the entire diierential assembly turns through a full revolution to advance disk 30 twenty steps. Disk 38 is provided with two portions 33 extending beyond the concentric part thereof and two notches 34 extending inside the concentric part.

- Riding on the periphery of disk 30 is an arm 35 loosely` pivoted on rod 36 and provided with a pin 3`I'in engagement with a contact blade 38. When disk 30 is in a rotative position representing any digit other-than 8, 18, 9 or 19, lever 35 is in contact with the concentric portion of the disk and holds blade 38 in mid-position to establish an open condition of pairs of contacts 4I! and 4 I. When the disk 30 is in a condition representing a setting of 8 or 18, one of the portions 33 lies under the nose of lever 35 and elevates pin 3T, so that contacts 49 are closed. When the disk is in a position to represent the digit 9 or 19, thevnose of lever 35 is in the recess 34 wherein pin 31 is lowered to permit closiue of contact 4I. Also riding on the periphery of disk 3U is a pin 43 carried by a lever 44 pivoted on rod 36 independently of the lever 35. When disk 30 moves from its rotative position representing 9 or 19 to the position representing 10 or 0, the rising portion 33 will pass under pin 43 and momentarily elevate it to thereby rock lever 44 clockwise. To the left end of this lever is pivoted a spring pressed pawl 45 which will engage Iand rock a notched platel 46 pivoted on a stud 6D. When the plate is rocked, a detenting pawl 48 will engage the lower one of the two notches at the right side thereof (Fig. 3) to hold the plate displaced while the pawl 45 returns. Integral with plate 46 is an arm 49 (Figs. 1 and 4) carrying a pin 5I) normally occupying the position shown in these' figures. When the plate 46 is rocked as explained, arm 49 and pin 5I)` are rocked to a midposition indicated in broken lines in Fig. 4, wherein the pin has moved away from the contact blade 5I to effect opening of the pair of contacts 52 and closure of pairs of

contacts

53 and 54. This is the position the parts will take if to the amount standing on disk 30 there is added an amount suicient to cause a tens carry of one unit. If such added amount is of sufficient value to result in a tens carry of two units, the disk 30 will advance sufficiently so that the second rise 33 will elevate pin 43 a second time and pawl 45 will reengage plate 46 beneath its lower tooth and rock the plate through an additional angle. This will result in rocking lever 49 and pin 50 in a third position indicated at Fig. 4 in which the pin will cause closure of contacts 55 and reopening of contacts 54. The manner in which the several carry contacts, when adjusted in their several positions, control the operation of the accumulating mechanism will be explained'inconnection with the circuit diagram. V In Figs. 2 and 6, the sleeve I5 which is integral with the carry disk 30 has secured thereto a. pair of brushes, 5ll which contact the readout device comprising individual segments 51 and common segment 58. The brushes represent by their setting the digit value standing on the disk. Thus, if the disk is in its 0 rotative position, one of the brushes-56 is in contact with the 0 segment 5T and the other is in contact with the common segment 58 'to provide a current path between the two.

Referring to Figs. 1 and 6, the plate 45 is freely rotatable on a rod 6D upon which there is also freely.l rotatable a lever 6I from which a pin' 62 projects into the plane of the pawl 45 and a seca' ond pin 63 projects into the path of holding pawl 48. When lever 6I is rocked clockwise as viewed in Fig. 1, these pins will engage their respective pawls to rock them out of engagement with plate 46, which will thereupon under spring influence return to the position of Fig. 1. This restoring action takes place after the carry period in the cycle and is effected as follows.

A lever 64 pivotally mounted on rod65 has a cam slot 66 embracing a pin 61 in lever 6I 'and also has an extension 68 lying in the path of the pin 89 carried by gear 12R. Thus, when pin 69 strikes lever 68 near the end of the revolution of the gear, lever 64 is rocked clockwise against the action of its spring 1U and cam slot l'will rock lever 6I clockwise to effect unlatching of plate 46.

In the operation of the accumulator, the normal or home position of each denominational disk 36 is with the disk in its rotative position representing 9, so that in effect the accumulator when reset contains the 9s complement of 0. When an amount is to be additively entered, the 9s complement of such amount is added and, when the amount is to be subtractivelyentered, it is directly added. The operation may best be ex- `plained by reference to a particular example. Let

it be assumed that the accumulator initially contains the true amount 74333, to which amounts 93121 and 21141 are to be concurrently added, resulting in the total 188595. In this case the several disks 36 of the accumulator are in rotative positions in the several orders representing the 9s complement 925666.

The two amounts to be added are perforated in record card C (Fig. 7b) and the card is in readiness to pass the brushes LB. The amount in the left hand portion of the card is to be entered in the left side of the accumulator and the amount in the right hand portion is to be entered in the right side of the accumulator. Plug connections 1I are made between plug sockets 12 of brushes LB and sockets 13, as represented for the units order brushes, for example. If the amount in the left portion of the card is to be added, switches L14 are closed and, if the amount in the right hand portion is to be added, switches R14 are closed. Since for the example chosen both amounts are to be added, switches L14 and R14 are in closed position as shown in Fig. 7b. With this preliminary switch setting made, main drive shaft Il) is given a single revolution during which the contact devices represented in Fig. 8 will operate to control the several circuit connections.

During the cycle as noted from Fig. 8, the contacts CIO first close to complete a circuit connection from one side of the line designated 15, through contacts CII), the L14 and R14 switches to the relays designated +L and +R to the other side of line 16. These relays will accordingly remain energized for the period indicated in Fig. 8, which is co-extensive with the period during which the digit perforations representing 9 to 1 pass the brushes LB. These relays shift related contacts designated with the same reference character as the relay followed by a lower case letter.

In Fig. 7a, contacts CI I close concurrently with the sensing of the 9 hole position in the card 'and complete a circuit from line 15, contacts CI I, wire .11, in parallel through all of the relay contacts -l-Ra (now shifted), thence through all of the contacts designated REa (in normal position), through all of the start magnets STR to line 16. *,Concui'i'ently, the circuit branches from wire 11, through all of the +La contacts (now shifted),

through all of the contacts REb (in normal position), through the start magnets STL to line 18. Accordingly, the entering clutch devices in both the left and right hand sections of all denominational orders are simultaneously operated, and rotation of all the disks IBL and I BR will commence, and will continue until a perforation is sensed in the related card column. In the units order (Fig. 7b) for example, such rotation will continue until the 1 hole is sensed, at which time a circuit is completed for the right hand amount, traceable from line 15, contact roller 18, l perforation in card C, right hand brush LB, plug socket 12, connection 1I socket 13 farthest to the right, wire 19, the lower set of contacts -f-Ra (now shifted) ,magnet SPR to line 16. This magnet is thus energized eight cycle points after the initial energization of magnet STR, and accordingly the corresponding disk LBR will have been advanced eight steps, which is the 9s complement of the 1 perforation sensed. For the left hand amount, the circuit is similarly traceable from line 15,

contact roller

18, 1 perforation in the card, brush LB farthest to the right in the left hand group, socket 12, connection 1I, socket 13, wire 80, lower relay contact -l-La (now shifted) and magnet SPL to line 16.

In a similar manner for other digital values, the circuit is completed to magnet SPL or SPR to advance the related disk IBL or I8R an amount representing the 9s complement of the value sensed. Where the digit punched is 9, the impulse from the card will occur simultaneously with the impulse to the related start magnet from contacts CII, so that in the related position the adding disk does not advance, inasmuch as concurrent energization of both start and stop magnets in an order will not operate the related armature. In card columns containing Os or columns containing no punching, a circuit is completed at the 0 time in the cycle from line 15 (Fig. 7a), contacts CE2, wire 8|, lower set of contacts -I-La (back in normal position at this time) and magnets SPL to line 16. The circuit from wire BI also extends through contacts +Ra and magnets SPR to line 16. At the time the contacts CI2 close, the -l-L and +R relays are deenergized, so their contacts are back in normal position enabling the completion of circuits therethrough to the stop magnets, and those which have not been previously energized will now be effective to uncouple the related adding disks after nine steps of advance. In those positions in which energization has previously taken place, the impulse will of course be idle.

The setting of the accumulator wheels or disks 3D will be represented as follows:

Setting of disk (initially) 9 2 Advance of disk IBR 0 Advance of disk IBL 7 Position of disk 30 before carry 7 Carries l 06 OOGUl mmc) In vthe above table it is indicated that the disks 30 advance to represent a setting of 799282 and in moving t0 such setting, the carry contacts of Fig. 4 will be shifted in response to the movement'of the disks 38. Since adding is effected complementarily, provision is made for so-called highest-to-lowest order carry, whereby in the above example a 2 is carried into the units order under control of the carry out of the'highest order. In the units order (Fig. 7b), the pin 50 will be in its lowermost position, as diagrammatically represented, to eiect closure of

contacts

53 and 55 and opening of

contacts

52 and 54, while pin 31 is in mid-position to hold

contacts

48 and 4| open. In the tens order pin 50 has moved to mid-position as indicated, and pin 31 is in position to close contacts 40, since in this order the disk is standing in its 18 position. In the hundreds order the pin 50 is in lowermost position While pin 31 holds

contacts

40 and 4| open.

In the thousands order, pin 50 is in mid-position and pin 31, due to a 19 standing in this order, is in position to close contacts 4I. In the tens of thousands order pin 50 is in its uppermost position representative of no tens carry, while pin 31 is in position to close contacts 4I representative of a 9 standing in this order. In the highest order, pin 50 is in its lowermost position representing a carry of 2, While pin 31 holds

contacts

48 and 4| open. This then diagrammatically represents the several carry contact settings for the problem chosen, and through the circuit connections now to be traced appropriate additional carry entries will be made.

As noted in Fig. S. the several relays +L and +R are deenergized as well as the relays designated -L, -R and RE so that the contacts thereof are in the positions shown, at the carry time in the cycle. Accordingly, when contacts CI3 (Fig. 7a) close at the time indicated in Fig. 8, a circuit is completed from line 15, contacts CI3, wiie 83 (Fig. 7b), to the units order, thence through contacts 53, wire 84 in this order, contacts designated -Ra., -l-Rc, REa, magnet STR in the tens order to line 16. As a result, the clutch in the right hand section of the tens order is coupled to drive its disk IBR. At the same time a second circuit is completed, traceable from the wire 83 (Fig. 7b), through contacts 55 in the units order, wire 85, contacts designated -La, --La, REb, magnet STL to line 18. Thus, the disk (8L in the tens order is coupled concurrently with the disk IBR. After one step of movement, contacts CI4 (Figs. 7a. and 8) close to complete a circuit from line 15, contacts CI4, wire 8|, contacts +Le. and -|-Ra to energize all of the SPL and SPR magnets which will result in uncoupling after the entering disks I8L and I8R have advanced one step. Since in the tens order both left and right hand disks have been advanced one step, the disk 3D associated therewith is advanced two steps from its 2 to its 4 position as indicated in the table above.

In the tens order it is noted that disk initially stood in its 18 position, and contacts 48 in such order are closed, so that the circuit just traced through wire 85 (Fig. 7b) will branch through the contacts in the tens order, through contacts 54 and the wire 85 to the hundreds order (Fig. 7o.), where it continues through contacts La, -i-La and contacts REb in the hundreds order to energize magnet STL to add a l in the left hand disk of the hundreds order.

Referring back to Fig. 7b, contacts 53 in the tens order are closed in accordance with a 1v carry condition, so that there is a circuit completed fromA Wire 83, contacts 53, wire 84 extending over to the hundreds order and thence through contacts -Ra, +Ra, REa to magnet STR to add a 1 in the right hand section of the hundreds order. In this manner a 2 is added to the 2 standing in the hundreds order of the accumulator.

In the hundreds order a circuit is traceable from wire 83, through the closed contacts 53 to energize the magnet STR of the thousands order through the wire 84 inv this order, and the now familiar circuit paths. Since in the thousands order the disk 30 stands at 19, its contacts 4| are closed so that the circuit through wire 84 branches through the contacts 4I in the thousands order, its closed contacts 54 and wire 85 to the magnet STL in the tens of thousands order. In the hundreds order the contacts 55 are closed, so that the circuit therethrough will energize magnet STL in the thousands order, resulting in advance of this order from 19 to l. The single carry setting in the thousands order represented by closure of contacts 53 will enable completion of a circuit through the STR magnet in the tens of thousands order. As already traced, the corresponding magnet STL is also energized as a result of the carry-on-carry of the contacts 4I in the thousands order, so that a 2 is added to the 9 setting of the tens of thousands order advancing this to l1.

In the highest order, contacts 55 are closed to represent a double carry and in this order a circuit is traceable from wire 83 to contacts 55, Wire 81 extending to Fig. 7b, where it passes through contacts La, |La and REb to magnet STL in the units order to add a l in the left hand part. In the highest order the contacts 53 are also closed so that a second circuit is traceable from the Wire 83, contacts 53, wire 88, which extends over to Fig. 7b, and thence through contacts -Ra, -i-Ra and REa to magnet STR of the units order. Thus, a 2 which might be called an elusive 2 is entered in the units order to advance the setting of 2 to 4. Following completion of these carry circuits, the amount standing on the disks 30 is 811404 which is the 9s complement of the true result.

When an amount is to be subtracted, switch L89 or R89 (Fig. 7b) is closed prior to the movement of the card past the brushes LB. Accordingly, when contacts CIU close, the relay L or `R or both will be energized for the period indicated in Fig. 8 and related contacts will be in shifted position during the portion of the cycle during which entries are made from the card.

Assuming, for example, that the amount in the right hand portion of the card is to be subtracted, switch R89 is closed and relay -R will be energized.' The magnets STR will now not be energized when contacts CII close, inasmuch as the circuit from these contacts through wire 11 is interrupted by the contacts |Ra which are now in normal position. These magnets become energized at the time that a hole is sensed in the related card column. Thus, for example, when a-perforation in the units column of the right hand section of the card is sensed, a circuit is completed from line 15, contact roller 18, perforation in the card, brush LB, socket 12, connection 1I, socket 13, wire 19, contacts -Ra in the units order (now shifted), contacts +Ra, REa and magnet STR to line 16. Thus, the related disk ISR Will commence to rotate at the time the hole is sensed. r

' Atthe 0 time in the cycle, when contacts CIZ close, a circuit is completed through wire 8| to al1 of-the SPR magnets as previously traced, so that the adding disk is advanced a number of steps equal to the true value of the digit sensed, and as the result balance disks 30 will be advanced accordingly and will operate carry contacts in lthe manner already explained. After the entry portion of the cycle, the carry start impulse o1 contacts CI3 is initiated and the carry stop impulse through contacts CM follows one step later to adjust the result disks so they represent the complernent of the true value of the algebraic surnmation. In the present arrangement, it is assumed that the iinal result is always a positive va1ue,.so that the setting on the disks 30 iS al-v ways a complement.

. Briefly summarizing, when an amount is to be added in the accumulator, the start magnets are initially energized to commence adding 9s in al1 orders, and the entering operation is interrupted upon sensing of the value perforations, so that the radding disks advance an amount represent-v ing the 9s complement of the value to be added. When an amount is to be subtracted, the start magnets are energized upon the sensing of the perforations and the rotation is interrupted at the point in the cycle so that the adding disks advance an amount representing the true value of the amount to be subtracted.

Result readout and reset As explained in the mechanical description, the result disk 30 advances readout brushes 56 which, by their position with respect to the segments 5l and common conductor 58 represent the value (complement) standing on the disks 30. When it is desired to read out the amount standing in the accumulator, switches 90 are closed and yshaft i0 is given a single revolution ,during which the contacts designated Cl to C9 in Fig. 8 close .in the order indicated. Accordingly, With .brushl `5,6' in the units order set to represent the complement 4, a circuit will be traceable from line l5 (Fig. 7b), through contacts C5 at the 5 time in the cycle, the 4 segment 5l, brush 56, conductor 58, switch 90, and a magnet 9| to line 16. Magnet 9| timed impulses to cause a type bar to print the character 5 in the well known manner.

If it is desired to reset the accumulator, the switch 92 (Fig. 7b) is closed before effecting the rotation of shaft I0, so that when such rotation commences, contacts CIU will energize relay RE and cause shifting of related relay contacts. Then, during the cycle when contacts C5 close, the circuit extends from line 15, through contacts C5, the 4 segment 5l and brush 56 to common conductor 58 as before, but branches` upwardly from the conductor through a wire 93, the contacts REa (now shifted), to magnet STR and line 16. Accordingly, rotation of the adding disk |8R is commenced. Five steps later in the cycle the contacts CIZ close and the stop circuit already traced through wire 8l is completed to energize magnet SPR. to uncouple the driving connection, at which time the disk will have advanced to its 9 position. The readout and resetting circuits in the other denominational orders will be completed in a similar manner. Speciflcally, in the tens order where the brush 56 is set at 0 (complement), the circuit is completed to the magnet STR in this order through contacts C9 and brush 56 in the 0 position, and the magnet SPR will be energized after nine steps of movement of the corresponding disk 30, so that this disk is also brought to the 9 position.

The net result is that during this resetting cycle all the adding disks 30 are advanced to their 9 positions which is the normal or home position of the disks. By operating the device with a home position in which 9s stand in all orders, the resetting and readout operations are operates printing mechanism responsive to effectivek during a single revolution of the drive shaft, since both the readout and reset circuits may be completed during the one cycle.

While there have been shown and described and pointed out the fundamental novel features of the invention as applied to a single modification, it will be understood that various omissions and substitutions and changes in the form'v and details of the device illustrated and in its operation may be made by those skilled in the art without departing from the spirit of the inven-v tion'. lIt is the intention therefore to be limited only as indicated by the scope of the following claims.

What is claimed is:

l. A denominational order of an accumulator comprising. a pair of entering wheels, each rotatable differential amounts to represent digita-1 entries, an adding wheel having twenty rotative positions, diiierential gear connections between said adding wheel and said pair of entering wheels, means for advancing each entering wheel aselected differential amount, whereby the adding wheel will be advanced through a number of rotative positions equaling the sum of the digits entered in entering wheels, a plurality of variably adjustable contacts controlled by said adding wheel 'and adjustable thereby in one manneinwhen the ywheel is advanced to a rotative position representing an entry of 8, in a second manner when the wheel is advanced to a rotative' position representing an entry ci 9, in a third marmer when the'wheel is advanced to a rotative position representing an entry of lil-to 1-'7,iri a fourth manner when the wheel is adfvanced to a rotative position representing an entry of 18, in a fifth manner when the wheel is advanced to a rotative position representing an entry of 19, and in a sixth manner when the wheel is advanced to a rotative position representing an entry of 20, and means controlled by said plurality of contacts for causing said advancing means to advance the entering wheels in accordance with carry requirements.

2. In a cyclically operating machine, an accumulator in which amount entries are made in one :part of a cycle and tens carries are made in a following part of the same cycle, each denominational order of which accumulator comprises a ,pair of entering wheels, rotatable differential amounts to represent digital entries therein, an adding wheel having twenty rotative positions, and differential gear connections between the entering wheels and the adding wheel, advancing means for the entering wheels, control means operative during said one part of a cycle to cause the advancing means to eiiect concurrent entry of selected digits into said entering wheels, whereby the adding wheel in each order will be advanced through a number oi rotative positions equaling the sum of the digits entered in the related entering wheels, carry control means for each order settable by the related adding wheel in accordance with the entry therein at the end oi said one part of a cycle, `and means eiiective during the .carry part of the cycle and controlled by the carry control means of any lower order to cause the advancing means to eiiect entry of a .unit into either or both the entering wheels of the next higher order in. accordance with tens carry requirements.

3. In a machine of the class described, an accumulator having a series of denominationally ordered adding wheels, a pair of driving wheels for each adding wheel, differential gear connections between each adding wheel and the pair of related driving wheels. a main drive shaft, electro-magnetic coupling means and control means therefor for concurrently coupling the driving wheels to the main drive shaft during one part of a revolution thereof for selected extents of rotation whereby each adding wheel is driven an extent representing the sum of the extents for which the related pair of driving wheels is driven by the main shaft, a set of contacts for each adding wheel set to different positions by the Wheel, means controlled by said main drive shaft and by the set of contacts of an adding wheel, during a later part of a revolution of the shaft for causing said coupling means to couple either or both of the driving wheels of the next higher order to the drive shaft according to the position of the said lower order wheel.

4. The invention set forth in claim 3 in which additional contacts are provided in each set and in which the last named means is further controlled by the said additional contacts of the said next higher order wheel to cause the coupling means to couple either or both of the driving wheels of the still higher order to the drive shaft according to the position of the said higher order wheel.

5. In a machine of the class described, an accumulator having a series of denominationally ordered adding wheels, a pair of driving wheels for each adding wheel, differential gear connections between each adding wheel and the pair of related driving wheels, a main drive shaft, electromagnetic coupling means and control means therefor for concurrently coupling the driving wheels to the main drive shaft during one part of a revolution thereof for selected extents of rotation whereby each adding wheel is driven an extent representing the sum of the extents for which the related pair of driving wheels is driven by the main shaft, a set of contacts for each adding wheel set to different positions by the Wheel, means controlled by said main drive shaft and by the set of contacts of the highest order adding wheel during a later part of a revolution of the shaft for causing the said coupling means to couple either or both of the driving wheels of the lowest order to the drive shaft according to the position of the said highest order wheel, and means controlled by said main drive shaft and by the set of contacts of a lower order adding wheel, during said later part of a revolution of the shaft, for causing the coupling means to couple either or both of the driving wheels of the next higher order to the drive shaft according to the position of the lower order wheel.

SAMUEL BRAND.

JAMES M. CUNNINGHAM.

LEON C. BISHOP.

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

UNITED STATES PATENTS Number Name Date 1,926,878 McFall Sept. 12, 1933 1,939,077 Mills Dec. 22, 1933 2,396,229 Blakely Mar. l2, 1946 2,399,755 Mills et a1 May 7, 1946