US2521382A - Decimal accumulator for direct entry of combination code amounts - Google Patents

Description

Sept. 5, 1950 H. P. LUHN DECIMAL ACCUNULATOR FOR DIRECT ENTRY OF COMBINATION CODE AMOUNTS 3 Sheets-Sheet 1 Filed Oct. 5. 1946 INVENTOR HANS P- LUHN BY z j ATTORNEY,

Sept. 5, 1950 H. P. LUHN 2,521,382

DECIMAL ACCUMULATOR FOR DIRECT ENTRY 0F v COMBINATION com: mourns Filed Oct. 5; 1946 3 Sheets-Sheet 2 ADD SUBT.

24 INVENTOR HANS P. LUHN Sept. 5, 1950 H. P. LUHN 2,521,332

DECIMAL ACCUMULATORFOR DIRECT ENTRY 0F COMBINATION CODE AMOUNTS Filed Oct. 5, 1946 3 Sheets-Sheet 3 INVENTOR HANS P. LUHN ATTORNEY Patented Sept. 5, 1950 2,521,382 DECIMAL ACCUMULATOR FOR DIRECT ENTRY OF COMB AMOUNTS INATION CODE Hans P. Luhn, Armonk, N'. Y., assignor to International Business Machines Corporation, New York, N. Y., a corporation of New York Application October 5, 1946, Serial No. 701,459

9 Claims. (01. 235-61.6)

This invention relates to record controlled accounting machines and more particularly tothe accumulating or totalizing mechanisms thereof.

The principal object of the invention is to provide an accumulator and control devices therefor which will be responsive to com-binational designations for direct entry of decimal values into the accumulator. The prior art as exemplified in present commercial machines employs a differential accumulator, each denominational order of which comprises an adding wheel advanceable through ten rotative positions to represent the digits 0, 1 9. This type of accumulator has heretofore been controlled in response to the sensing of perforations selectively made in one of ten differential positions in the well known Hollerith card, so that in accordance with the digits to be entered the accumulator wheel moves through an angle corresponding to the value of the digit entered, and such movement has been effected with a single continuous motion for each digit. It has also been proposed to control this type of accumulator by repeatedly startin and stopping the movement of the adding wheel in response to the sensing of coded or combinational perforations, whereby the Wheel is advanced in separate steps of varying amounts. Such operation, wherein for the entry of most of the digits repeated operation of the start and stopping mechanism is required, imposes considerable wear and shock on the mechanism.

It is an object of the present invention to provide for controlling a differential type of accumulator under control of coded perforations in such manner that the entry of most of the digits is effected with a single start and stop operation, that is, for entry of all of the digits except the digit 6, the entry is effected by moving the adding Wheel a distance proportional to the value of the digit and with a single continuous movement.

Other objects of the invention will be pointed out in the following description and claims and illustrated in the accompanyin drawings, which 5- 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:

Fi l is a view in side elevationof the essential operating elements of one denominational order of the accumulator.

Fig, 2 is a detail view showing the driving clutch mechanism.

Fig. 3 is a timing diagram.

Fig. 4 constitutes a wiring diagram of the circuits for controlling the operation of the accumulator mechanism.

The card In Fig. 4 is shown a portion of a record card I0 provided with vertical columns in which the digits 1 to 9 may be recorded by perforations made in a set of four horizontal rows having the values 1, 2, 2, 5 as shown. It is diagrammatically indicated that the card I0 is advanced by feed rollers I l to pass a row of sensing brushes l2 and that, after data perforations on one card have passed the brushes, there is an interval following which correspondin perforating positions on a followin card pass the brushes. The interval between the lowest perforating rows of the successive cards is termed a cycle of operation of the machine, and this cycle is subdivided into sixteen so-called cycle points. In Fig. 3, the period in a cycle during which brushes l2 sense the 1, 2, 2, 5 value positions is shown in relation to the timing of closure of a number of cam operated contacts prefixed C which are driven from a suitable shaft (not shown) in time with the card feed rollers to effect closure of the contacts at times indicated. The perforating code shown in Fig. 4 is such that a digit is represented in a perforating column by the omission of a perforation in that position which corresponds, or those positions whose sum corresponds, to the digit to be represented and by perforations in the remaining position or positions. To state this conversely, to represent a digit, perforations are made in the value position which equals, or the value positions whose sum equals, the tens complement of the digit.

The accumulator driving mechanism is of the same construction as shown in Lake et :11. Patent 2,328,653 and includes a ratchet l5 which is free on post l6 and integral with a gear ll driven by gear |4 (Fig. 2). Rotatably carried by post I6 is a disk 20 having ten teeth 20a adapted to be engaged by tooth 2|a on the long arm of a clutch lever 2| to hold the disk against rotation in a counterclockwise direction.

At theside of diskjll is a register or adding wheel,24 rotatable on post l6 and provided with ten peripheral notches 24a. Wheel 24 may take any of ten rotative positions with the valuesO, 1 9. A spring pressed lever 25 engages with i notch 24a of wheel zqt h ldtn wheel impositively and to center it in-the value position into which it has been rotated. A transfer cam 25 is fixed to the side;of wheel :24, and a stud 21 in wheel 24 extendsthrough an opening in disk 20 to pivotally carry a clutch dog .30. A sprin 3| urges the tooth of dog 3|l. to engage ratchet l5. In the positions shown in Fig. l, the clutch lever 2| is in declutching position, its tooth 2|a is restraining rotation of disk 20 counterclockwise and dog 30 is clear of ratchet l5. The dog 30 is being held clear of theratchet ,bycoaction of a. pin 301) on the dog with a cam edge 20b of disk 20.

When the clutch lever.2 is dropped to cause its tooth; 2|a..to release the. disk 20 for counterclockwise movement, the spring 3|. is effectedto rock the dog 30 into engagement with. ratchet 45.

During this movement of the dog 30,its pin 30b rides down the cam. edge 20?) and cams the disk counterclockwise until its tooth-20a previously en- ..gagcdbytooth Zia, isto the right of the. latter tooth. Theparts are then in the clutching: positionshown in Fig. 2,. andthe register. wheel .24 is eoupled to the driving devicev |5,.|1-for rotation. flhroughengagementof the pin.30b of the dog 3fl with cam edge 2022, the disk 20 is forced to rotate counterclockwise together with the ,register wheel.

Whenthe clutch lever 2|. is returned toupper de-clutching position, its too,th 2|a intercepts a .tooth 28a of. disklfl andstops the .disk.;.Begister wheel 24 and dog 36 continuerotatingwhilecam edge 20b cams the pin, 30b upwardly untilit. is

.. again in its outer position. ,As thepin 30b is cammed outwardly, clutch dog 3D moves.clear of ratchet |5 and declutches the register wheel from I the driving means. The registerwheelis then held and, centered in its new, value. position by lever, 25. Aspring urged latch 35. servesto hold lever 2| in either clutching or declutching position.

The clutch lever 2| has a short arm swiveled to the lower end of an ar nature iifi, which isdisposed. between an advance magnet AM and a stop magnetSM. Energization of magnetAM rocks armature 3S clockwise to lower lever 2| and energization of magnet SM rocks armature 3Gcounterclockwise to raise the lever. 2|.

When the wheel 24 is in its 0, 1 8 positions, the cam-26 holds a carry lever: .3'| ,pi-v oted at ,38 in the position shown in Fig. 1,, where. a ,contact blade 39 (insulated from lever 31) takes a midposition between contact elements 40 and 4|. When the wheel is in its 9v position, a tooth on I lever- 31 is dropped into a cut 25a,of cam 26 and blade 39 contacts element 4|. Whenthe wheel 24 passes from the 9 to position, a rise 25b rocks lever 31 to cause blade 39 to engage elementjfl. When the lever is so rocked an arm integral therewith is engaged and held by a spring urged it upwardly into the 4 latch 43 which maintains the contact engagement between 39 and until a pin 44 in gear |4 strikes an arm 45 integral with the latch 43 to release lever 42. The point in the cycle at which such unlatching occurs is indicated in the time chart in Fig. 3. The accumulator is also provided with. a mechanical knockoff or declutching mechanism which comprises a lever pivoted to the side of gear M. The lever is urged clockwise by a spring 5| and limited in such movement by cngagement of a surface thereof with the hub of gear I 4. Lever I5 is provided with a pair of spaced knockoii pins 52 and 53 adapted during rotation of gear l4 to ride in succession ..under-.an. edge of clutch lever 2|.

Assume the clutch lever to be in lower position, when either pin 52 or 53 engages lever 2!, it cams position of Fig. 1. The 53 are efiective at fixed indicated in the diagram knockoff pins 52; and ,points of the cycle as (Fig. 3).

The foregoing briefly describes the operation of the prior accumulating mechanism. For the purposes of the present invention, the detent lever 25 is providedwith a pin 54, which is straddled by the bifurcated end of a bell crank lever pivoted at .58. This lever hasan insulating roller 51 lying above acontact blade58. When the register wheel 24 is at rest as in Fig. 1, the blade 58.is, in

contacting engagement withan electrical conducting element 59. During theperiod that the register wheel 24 is in motion between adjacent registeri ng positions, the lever 25 is rocked clock- A wise and through pin 54 willrock and hold the .bell crank 55 counterclockwise, so thatroller 51 will shift blade 58 out of engagement with contact element 59 and into engagement with a second contact element designated 60. It will be noted that the nature of the notches 24a is suchthat the lever25 ta es the position of Fig. 1 only. when thewhee124is exactly in a registering position and any displacement to the leitor rightwill shift the lever. In other words, when the wheel moves from one registering position to thenext adjacent one, the lever 25 is rocked immediately upon the commencement of movement and ,re-

mains rocked until the very completion.

Circuit diagram The manner in which digital values are entered will. now be explained in connection with the circuit diagram (Fig. in which plug connec- .tions 6| are made between brushes 2 and sockets 152., Current is firstplaccdon main line-s63 and .54 .[rom a suitable source and, as the card l0 moves past brushes l2, it closes theusual card leverv contacts 65.

The circuitsinvolved in the entry oi the several digits will besep arately explainedinthe following.

' Digit 1..The.perforatlons representing digit 1 aremade in the 2, 2, 5 index pointpcsitions and, when the first 2 position is at brushes |2, a circuit is traceable from line 64,; contacts 65, roller. 66,

2.hole in the card, brush l2, connection 6|,socket 62, wire 61, a contacts of magnet R3 (shifted), wirejllye contacts of-magnet S. (1 contacts of magnet RI, magnetAMto line 63. Concurrently,

there is. a circuit completed. from. line..S4, .contacts C2,.dcontacts of magnet S, 0 contacts of .Inagnet RI, and .magnet SM toline 63. Thus, when the first 2.hole inthe card is sensed, both the start and stop magnets are... concurrently energized. Sinceat this time the. armature 36 (Fig. 1) is already against the core of magnet SM,

,of the accumulator wheel. is that the force of attraction exerted by the SM of the same order will not result in the clutching The reason for this magnet on armature 36 will be greater than that exercised by the AM magnet because of the air gap between armature 36 and the core of the AM magnet. Thus, in the present case the first hole sensed will be ineffective to operate the accumulator.

A further circuit is completed through this first 2 hole which branches from wire 69 to the b contacts of magnet RI, magnet R4' to line 63. Magnet R4 closes its a contacts to provide a holding circuit through contacts CI. At the 4 point in the cycle (see Fig. 3) before the next 2 hole position is sensed, a circuit is completed from line 64, contacts C3, 1) contacts of magnet R4 (now closed), magnet RI to line 63. This magnet closes its a contacts to establish a holding circuit through contacts 01, so that now both magnets RI and R4 are energized. Concurrently, there is a, circuit traceable from line 64, contacts C3, contacts of magnet R4, and magnet AM to line 63. The adding wheel 24 is'coupled for rotation and will commence to turn.

While it is rotating, the second 2 perforation is sensed by brushes I2 and a circuit is completed from line 64, contacts 65, roller 66, hole in the card, brush I2, connection 6I, socket 62, wire 61, a contacts of magnet R3 (shifted), wire 69, b contacts of magnet S, 0 contacts of magnet RI (shifted), magnet SM to line 63. This energizetion of magnet SM occurs one cycle point after the energization of magnet AM, so that the adding wheel 24 is uncoupled after it has advanced one step or cycle point.

Thereafter, as the third or 5 hole is sensed, a circuit is completed from line 64, contacts 65, roller 66, hole in the card, brush I2, connection 6|, socket 62, wire 61, a contacts of magnet R3, wire 69, b contacts of magnet S, 0 contacts of magnet RI (shifted) and magnet SM to line 63 as before. At this time there is a concurrent circuit completion, traceable from line 64', contacts C5, detent contacts 58, 59, a and 0 contacts of magnet S, (1 contacts of magnet RI (shifted) and magnet AM to line 63. The concurrent energiZation of the start and stop magnet will, as explained, render both ineffective.

In Fig. 3, the operations just described are di- I gization of relay magnet R4. The start magnet alone is energized at cycle point 4 and, after the usual mechanical lag, the adding wheel 24 commences to rotate and will be stopped after rotating for one cycle point by energization of magnet SM. The subsequent concurrent energization of magnets AM and SM is inefiective and is an idle operation in so far as the digit 1 is concerned.

In Fig. 3 are shown the points at which the AM and SM magnets are energized and, where the magnet is energized in response to a circuit through a card perforation, that fact is indicated in the diagram by a circle or dot superimposed on the horizontal line representing .the period of energization of the magnet. Where the circle or dot is not present, the energization is under control of the contact cam devices. Digit 2.-This digit contains a perforation in the 1 position, so that at the time this perforation is sensed a circuit is completed from line 64,

contacts 65, roller 66, 1 hole, brush I2, connection 6|, socket 62, wire 61, a, contacts of magnet R3 (normal), wire 68, relay magnet Rl to line 63. Magnet RI will hold through contacts C1 for the period indicated in Fig. 3. Between the sensing of the 1 position and the first 2 position, magnet R3 is energized by closure of contacts C6 so that for all of the digits, while the 1 hole position is sensed, magnet R3 is in deenergized condition and will be in energized condition during the sensing of the remaining hole positions.

When the second hole of digit 2 is now sensed, a circuit will be completed from line 64, contacts 65, roller 66, the first 2 hole, brush I2, connection 6I, socket 62, wire 61, a contacts of magnet R3 (shifted), wire 69, b contacts of magnet S, 0 con- .tacts of magnet RI (shifted), and the magnet SM to line 63. Concurrently, a circuit is completed from line 64, through the contacts C2, d contacts of magnet S, d contacts of magnet RI (shifted) to magnet AM, to line 63. Again, the concurrent energization of the start and stop magnets leaves the driving mechanism at rest.

Later, at the time when the second 2 position is sensed and where no perforation is present, a circuit is completed from line 64, contacts C5, contacts 58, 59, a and 0 contacts of magnet S, d contacts of magnet RI (shifted), and magnet AM to line 63.

The adding wheel 24 is accordingly coupled for rotation and two cycle points later, when the 5 hole position is sensed, a circuit is completed therethrough extending to wire 61 through the now familiar path, and continues through a contacts of magnet R3 (shifted), wire 69, 1) contacts of magnet S, c contacts of magnet RI (shifted), to magnet SM to thereby interrupt the rotation of the adding wheel 24.

Digit 3.-For thi digit there is a perforation in the first 2 and 5 position, so that upon sensing of the first hole a circuit is completed in the same manner as for digit 1 to energize the magnet AM and also energize relay R4. Concurrently, the magnet SM is energized through the cam contacts C2. The operation is thus the same as for the digit 1, and at cycle point 4 the magnet AM is energized together with relay RI, so that adding wheel 24 commences to rotate in the same manner as explained for the digit 1. For digit 3, there is no second 2 hole, so that the SM magnet is not energized as it was for digit 1 and the 'wheel continues to rotate until, at cycle point 5, a circuit is completed through the 5 hole to energize magnet SM and interrupt the rotation of wheel 24 after it has advanced three steps or positions. The energizing circuit for magnet SM is traceable through the 5 hole to wire 6'! and thence through a contacts of magnet R3 (shifted), wire 69, b contacts of magnet S, 0 contacts of magnet RI (shifted), to magnet SM. Since at this time the adding wheel is rotating, the contact blade 58 is in its shifted position and the circuit therethrough to the AM magnet, which was completed for digit 1, cannot now be completed and the magnet SM will be effective to interrupt rotation.

Digit 4.-Digit l has a perforation in the 1 position so that relay magnet RI is energized as indicated in Fig. 3, and at the 3 point in the cycle magnet AM will be energized through a circuit from line 64, contacts C2, d contacts of magnet S, (1 contacts of magnet RI (shifted), to magnet AM, and rotation of wheel 24 will commence at thispoint. When the 5 hole is sensed, a circuit 7 is completed to the SM magnet as indicated in Fig. 3 and will interrupt rotation of wheel 2 after it has advanced four steps.

Digit 5.The digit 5 has perforations in the first three punching positions and from Fig. 3 it will be noted that sensing of the first position will result in energization of magnet RI, and sensin in the second position will result in energization of magnet SM at the same time that magnet AM is energized through contacts C2, in the same manner as explained for digit 2. Upon sensing of the third perforation, a circuit extends therethrough to wire 61, thence through a contacts of magnet R3 (shifted), wire 69, 1) contacts of magnet S, contacts of magnet RI (shifted), to magnet SM. This will negative the effect of a concurrent circuit from line 84, through contacts C5, contacts 58, 59, a and c contacts of magnet S, d contacts of magnet RI (shifted) to magnet AM, so that the adding wheel continues at rest. At the 7 point in the cycle, when contacts C close for the second time, this circuit to the AM magnet is repeated. Since there is no concurrent energization of the SM magnet, wheel 24 is coupled for rotation and will advance five points or steps until disengaged by knockout pin 52 at the 12 point in the cycle as indicated in Fig. 3.

Digit 6.-For this digit, magnet AM is energized in response to sensing of the first perforation and magnet R4 is energized therewith. The concurrent energization of magnet SM will negative the effect of the start magnet in the same manner as explained for digit 1. Also, as for digit 1 the AM magnet is energized at cycle point 4 along with relay magnet RI, and the adding wheel commences to rotate and will be uncoupled after one step through energization of magnet SM under control of the second perforation in the card. Up to this point the operation is the same as for digit 1. Later, at the '7 point in the cycle, when contacts C5 close, magnet AM is energized through the same circuit as explained in connection with digit 5, so that the adding wheel is again rotated and is stopped by the mechanical knockout pin 52 after five additional steps of rotation.

Digit 7.-For this digit the operation is the same as explained for digit 2, as diagrammatically shown in Fig. 3, except that at cycle point '7 there is no card perforation to declutch the adding wheel after two steps, and it will accordingly continue an additional five steps until uncoupled by the mechanical knockout.

Digit 8.The operation her is the same as for digit 3 with rotation of the adding wheel initiated by a machine impulse under control of contacts C3 and, since there is no declutching impulse from the card, the wheel continues rotation through eight steps until disengaged by the mechanical. knockout.

Digit 9.--Thl5 digit contains a single perforation in the 1 position which will energize relay RI so that, when contacts C2 close at the 3 point in the cycle, a circuit is completed from line 64, contacts 62, d contacts of magnet S, d contacts of magnet RI (shifted) to magnet AM, and the rotation thus initiated will continue until the mechanical knockout occurs after nine steps of rotation.

Examination of Fig. 3 will show that for all of the digits except 6 the entry occurs in a single uninterrupted movement of the adding wheel, and in each case the rotation is commenced by a machine impulse as distinguished from a card im- 8 pulse, and is interrupted either by a card impulse or by mechanical knockout.

Tens Carry.-The tens carry circuits are the same as previously employed in this type of accumulator and are indicated in the circuit diagram, and the time of operation is shown in Fig. 3. There it is represented contacts CIO first close to prepare the connections between successive orders, so that when contacts C9 close if any wheel has passed through 0, a circuit is completed through contact 40, 39 of the magnet AM in the next higher order. If this order happens to stand at 9, the circuit branches through its contacts ll, 39 to a still higher order.

Subtraction When an amount is to b subtractively entered, switch 15 (Fig. 4) is closed so that magnet S will be energized during the closure of contacts C8 for the period indicated in Fig. 3, which is concurrent with the period that magnet R3 is also energized. Considering the circuits involved for each of the digits separately, the operations will be as follows:

Digit 0.With no perforations in a column, there will, of course, be no circuits completed through the card. At the 3 point in the cycle, when contacts C2 close, a circuit is completed to magnet AM in each order traceable from line 64, contacts C2, e contacts of magnet S (shifted), (1 contacts of magnet Rl to magnet AM and line 63. This will initiate rotation of adding wheel 24 which will continue for nine steps until the mechanical knockout pin 52 disengages the clutch, so that for a 0 or blank designation the 9s complement of the value is entered.

Digit 1.For this digit there is an energization of magnet SM through the first perforation traceable in the familiar manner through wire 51, thence through 0. contacts of magnet R3 (shifted), wire 69, c contacts of magnet S (shifted), 0 contacts of magnet Rl to magnet SM. A parallel circuit extends from wire 69, b contacts of magnet RI, and magnet R4 to line, so that magnet R4 is energized along with magnet SM under control of the perforation as indicated in Fig. 3. Concurrently, there is a circuit completed to energize magnet AM under control of contacts C2 traceable as before, so that as a result of the opposing energizations the rotation of wheel 24 is not initiated at this point. At the next cycle point the contacts C3 close and a circuit is completed from line 64, contacts C3, 0 contacts of magnet R4 (shifted), to magnet AM and a parallel circuit extends through the 1; contacts' of magnet R4 to energize magnet RI. The adding wheel commences to rotat and will continue for eight steps until mechanically disengaged. When the second and third perforations for digit 1 are sensed, the magnet AM will be energized each time but each energization will be accompanied by an opposing or blocking energization of magnet SM, so that rotation of wheel 24 is not disturbed.

Specifically, when the second perforation is sensed, a circuit extends from wire 61, a contacts of magnet R3, wire 69, c contacts of magnet S, d contacts of magnet Rl to magnet AM. The opposing circuit is traceable from line 64, contacts C5, contacts 58, 60, a contacts of magnet S, b contacts of magnet S, 0 contacts of magnet Rl to magnet SM. It will be noted that this circuit is controlled by contacts 58, 60 which are in shifted position at this time because the adding wheel is rotating.

Digit 2.-For this digit there is a perforation in the 1 position so that the circuit through the perforation will energize relay magnet RI as already explained, and as indicated in Fig. 3. There is also a perforation in the first 2 position which will complete a circuit to magnet AM and will commence rotation of the adding wheel. This circuit extends from wire 61, through a contacts of magnet R3 (shifted), wire 59, c contacts of magnet S (shifted), d contacts of magnet RI (shifted) to magnet AM. After two steps, magnet SM is energized through a machine impulse completed from line 64, contacts C5, contacts 58, 60 (shifted), a contacts of magnet S (shifted), b contacts of magnet S (shifted), c contacts of magnet RI (shifted), to magnet SM. At the '7 point in the cycle, magnet AM is again energized through the hole in the card and the same circuit path as for the first energization. Five steps later, the mechanical knockout functions so that the complement '7 will have been entered in two parts, that is, as a 2 and as a 5 increment of movement.

Digit 3.-For this digit the first hole sensed will energize magnets SM and R4 while magnet AM is concurrently energized as explained in the same manner as for digit 1, followed a point later by energization of magnet AM to commence rotation of the adding wheel. A point later, magnet SM is energized through contacts C5 and the shifted contacts 58, 60. Later, magnet AM is energized through the 5 hole to recommence rotation of the wheel for five additional steps.

Digit 4.-For this digit magnet RI is energized in response to the 1 perforation. Later, in response to a 5 perforation, magnet AM is energized to initiate the five steps of movement terminated by the mechanical knockout.

Digit 5.For this digit magnet RI is initially energized in response to the sensing of the 1 hole. In response to the sensing of the next hole, magnet AM is energized to initiate rotation of the adding wheel. The second hole will again energize magnet AM concurrently with a machine energization of magnet SM, so that movement of the wheel is not interrupted and it will continue until magnet SM is energized for the second closure of contacts C5.

Digit 6.-For this digit 6, the first hole sensed will cause energization of magnets SM and R4 concurrently with a cam contact energization of magnet AM, and a point later magnet AM is energized under control of contacts C3 to commence rotation of the adding wheel. Another point later the cam contact energization of magnet SM will be opposed by energization of magnet AM through the second card perforation, so that the wheel continues rotation until magnet SM is energized to uncouple the adding wheel after three steps of movement.

Digit; 7.-For this digit there is an initial energization of relay magnet RI followed by energization of magnet AM through the 2 perforation, as for digit 5, to commence rotation of the adding wheel. Two steps later, magnet SM is energized upon the first closure of contacts C5, so that this operation terminates after a 2 has been entered.

Digit 8.-For this operation there is a card energization of magnet SM and R4 and a machine energization of magnet AM, as for digits 1, 3 and 6. A point later, magnet AM is energized to commence rotation of the wheel. A single point after this magnet SM is energized, when contacts C5 first close to interrupt the wheel movement after one step.

For simplicity of disclosure, it has been assumed that the amount subtracted will not exceed the amount standing in the accumulator, so that socalled negative balances will not occur. Therefore, each subtracted entry will require the addition of a fugitive 1 in the lowest order. This is taken care of in the well-known manner by causing the carry impulse from the highest order to operate the magnet AM and in the lowest order at the carry point in the 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 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 invention. It is the intention therefore to be limited only as indicated by the scope of the following claims.

What is claimed is:

1. In a machine controlled by a card having designations arranged at four index point positions according to a 4-hole code, representing singly or in combination all digits 1-9 of the decimal system, means for sensing the four index point positions to ascertain the presence of designations therein, an accumulator unit of the type wherein the digit entry in an accumulator element is initiated by an impulse transmitted to a start magnet, and is terminated by an impulse to a stop magnet or by mechanical means, cyclically operable impulse transmitting means for transmitting impulses to either the start or stop magnets at different times, control circuit connections between the magnets and. said impulse transmitting means, and means controlled by said sensing means for adjusting the control circuit connections so that an impulse is transmitted to the start magnet for entry of the digits 9, 8, 7 and 5 at differential times prior to operation of the mechanical stop means to enter such digits by a single start and stop action, and so that an impulse is transmitted to the start magnet for entry of the digits 4, 3, 2 and 1, and an impulse is thereafter transmitted to the stop magnet to enter such digits by a single start and stop action.

2. In a machine controlled by a card having designations arranged at four index point positions according to a 4-hole code representing singly or in combination all digits 1-9 of the decimal system, means for sensing the positions in succession to ascertain the presence of designations therein, an accumulator unit of the type wherein the digit entry in an accumulator element is initiated by an impulse transmitted to a start magnet and is terminated by an impulse to a stop magnet or by mechanical means, cyclically operable impulse transmitting means for transmitting impulses to the start magnet at differential times in advance of the operation of the mechanical terminating means, to enter digits 9, 8, '7 and 5, control circuit connections between the magnets and said impulse transmitting means, means controlled by the sensing means in response to the sensing of a designation in only the first of the four designating positions for effecting an adjustment of said circuit connections to connect said impulse transmitting means to the start magnet to enter a 9 in the accumulator element.

3. In a machine controlled by a card having designations arranged at four index point positions according to a -hole code representing singly or in combination all digits 1-9 of the decimal system, means for sensing the positions in succession to ascertain the presence of designations therein, an accumulator unit of the type wherein the digit entry in an accumulator element is initiated by an impulse transmitted to a start magnet and is terminated by an impulse transmitted to a stop magnet or by mechanical means and wherein concurrent impulses to both start and stop magnets will be ineffective to cause either initiation or termination of an entry, cyclically operable impulse transmitting means for transmitting impulses to the magnets at differential times in advance of the operation of the mechanical terminating means for entering the digits 9, 8, '7 and 5, control circuit connections between the magnets and said impulse transmitting means, means controlled by the sensing means in response to the sensing of a designation in only the second of the four designating positions for energizing said start magnet at the 9 entry time, said impulse transmitting means being concurrently effective to energize the stop magnet so that the start impulse is ineffective, further means controlled by the sensing means for adjusting the circuit connections and to direct an impulse from the transmitting means to the start magnet at the 8 time to enter an 8 in the accumulator element.

4. In a machine controlled by a card having designations arranged at four index point positions according to a 4-hole code representing singly or in combination all digits 1-9 of the decimal system, means for sensing the positions in succession to ascertain the presence of designations therein, an accumulator unit of the type wherein the digit entry in an accumulator element is initiated by an impulse transmitted to a start magnet and is terminated by an impulse transmitted to a stop magnet or by mechanical means and wherein concurrent impulses to both start and stop magnets will be ineffective to cause either initiation or termination of an entry, cyclically operable impulse transmitting means for transmitting impulses to the magnets at differential times in advance of the operation of the mechanical terminating means for entering the digits 9, 8, 7 and 5, control circuit connections between the magnets and said impulse transmitting means, means controlled by the sensing means in response to the sensing of a designation in each of the first two designating positions for adjusting the circuit connections when the first designation is sensed, energizing the stop magnet through the adjusted connections upon sensing of the second designation, said impulse transmitting means concurrently energizing the start magnet through said adjusted connections so that the start impulse is ineirective, said adjusted connections directing an impulse to the start magnet at the 7 time to enter '7 in the accumulator element.

5. In a machine controlled by a card having designations arranged at four index point positions according to a -hole code representing singly or in combination all digits l-9 of the decimal system, means for sensing the positions in succession to ascertain the presence of designations therein, an accumulator unit of the type wherein the digit entry in an accumulator element is initiated by an impulse transmitted to a start magnet and is terminated by an impulse transmitted to a stop magnet or by mechanical means and wherein concurrent impulses to both start and stop magnets will be ineffective to cause either initiation or termination of any entry, cyclically operable impulse transmitting means for transmitting impulses to the magnets at difierential times in advance of the operation of the mechanical terminating means for entering the digits 9, 8, '7 and 5, control circuit connections between the magnets and said impulse transmitting means, means controlled by the sensing means in response to the sensing of a designation in the first position for adjusting said circuit connection and in response to the sensing of a designation in the second position for energizing the stop magnet, said impulse transmitting means energizing the start magnet concurrently therewith at the 9 cycle time, and at the 5 time energizing the start magnet through said connections to enter a 5.

6. In a cyclically operable accumulating mechanism of the type wherein the digit entry in an accumulator element is initiated by an impulse transmitted to a start magnet and is terminated by an impulse transmitted to a stop magnet and wherein concurrent impulses to both start and stop magnets will be ineffective to cause either initiation or termination of an entry, the combination of cyclic means for transmitting an impulse at each of a plurality of predetermined points in a cycle of operation of the accumulator, record controlled means for selectively transmitting an impulse at any of said predetermined points, circuit connections between said cyclically transmittin means and said magnets, and means for adjusting the circuit connections so that at one or more of said points an impulse from said cyclic means will energize the stop magnet and an impulse from the record controlled means will concurrently energize the start magnet to negative the effect of either magnet at such points.

7. In a cyclically operable accumulating mechanism of the type wherein the digit entry in an accumulator element is initiated by an impulse transmitted to a start magnet and is terminated by an impulse transmitted to a stop magnet and wherein concurrent impulses to both start and stop magnets will be ineffective to cause either initiation or termination of an entry, the combination of cyclic means for transmitting an impulse at each of a plurality of predetermined points in a cycle of operation of the accumulator, record controlled means for selectively trans mitting an impulse at any of said predetermined points, circuit connections between said cyclically transmitting means and said magnets, and means for adjusting the circuit connections so that at one or more of said points an impulse from said cyclic means will energize the start magnet and an impulse from the record controlled means will concurrently energize the stop magnet to negative the effect of either magnet at such points.

8. In a cyclically operable accumulating mechanism of the type wherein the digit entry in an accumulator element is initiated by an impulse transmitted to a start magnet and is terminated by an impulse transmitted to a stop magnet and wherein concurrent impulses to both start and stop magnets will be inefiective to cause either initiation or termination of an entry, the combination of cyclic means for transmitting an impulse at each of a plurality of predetermined points in a cycle of operation of the accumulator, record controlled means for selectively transmitting an impulse at any of said predetermined points, circuit connections between said cyclically transmitting means and said magnets, and means for adjusting the circuit connections so that at one or more of said points an impulse from said cyclic means will energize one of said magnets and an impulse from the record controlled means will concurrently energize the other magnet to negative the effect of either magnet at such points.

9. In a cyclically operable accumulator unit of the type wherein the digit entry in an accumulator element is initiated by an impulse to a start magnet and is terminated by an impulse to a stop magnet, and wherein concurrent impulses to both start and stop magnets will be inefiective to cause either initiation or termination of an entry, cyclically operable impulse transmitting means for transmitting impulses to the magnets at a plurality of difierential times in a cycle, circuit connections between said transmitting means and said magnets, means for sensing a record for perforations therein representative of the digits 1-9,

14 and means controlled thereby for adjusting said circuit connections so that impulses are selectively directed from said transmitting means to said start magnet in accordance with the digit representing perforations sensed.

HANS P. LUHN.

REFERENCES CITED The following references are of record in the 10 file of this patent:

UNITED STATES PATENTS

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