US2019900A - Accounting machine - Google Patents

Description

5 Sheets-Sheet 1 Nov. 5, 1935. F. 1 FULLER AccoUNfrmG MACHINE Original Filed Oct. 21, 1930 5 Sheets-Sheet 2 s, w mw, Fm., mm EN EN SN .m\ 8. O* NON E BN i S. g EN QQ R l n mm 9 mv TS N2 mm e lv mm. m u sa. E v. J Nmm. A E ,um mv vm u. wm mm :v NN

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ZM ATTORNEY Nov. 5, 1935.` F. l.. FULLER ACCOUNTING MACHINE 5 S'heets-SheetI 3 Original Filed Ot. 21, 1930 ATTO RN EY Nov.' 5, 1935. F. FULLER ACCOUNTING MACHINE original Filed oef..y 21, 1930 5 Sheets-Sheet 4 f. I liV/EFR F. L. FULLER ACCOUNTING Nov. 5, 1935.

MACHINE original 'Fired oct. 21, 1930 5 Sheets-Sheet 5 i ATTORNEY Patented Nov. 5, 1935 UNITEDl .STATES PATENT OFFICE to International Business Machines Corporation, New York, N. Y., a corporation of New York original application october 21,1930, semi Nb. 490,155. Divided and this application February 17, 1934, serial No. 111,692

1s claims. (ci. zas-so) This application is a. division 'of the co-pend-` ing application of Frederick L. Fuller, Serial No. 490,155, led October 21, 1930.

'I'he present invention relates to calculating machines particularly of the ten-key type. l

'I'he main object of the present invention is t improve the differential mechanisms under c ontrol of the ten keys so as to simplify such mechanisms and cause the operations to be more posi- In the present construction a source of power is `utilized to rotate a master wheel and the latter as it rotates sets up item representing wheels one after the other, such wheels constituting indieating wheels which Amay be visually read prior to the entry of the, item in the accumulator or item.- printing devices. l l

1n the event of an error the error mechanism, which is also of an improved type. may come into play to reset the item representing wheels so that the item will not be entered in the accumulator or item printing devices, if employed.

A further object of the invention is to improve the en'or correcting mechanism so that theoperation of resetting the item indicating wheels is effected by power and in such manner that such an operation is the only one effected.

The present invention also includes a modification of the error correcting mechanism which is constructed in a dierent manner but includes the same improved features.

@Chef vention -is illustrated in the drawings in whichzly Fig. l is @view in elevation of the ten key keyboard cont ng mechanism and also shows of the one-revolution clutch Fig. 2 is vp.

mechanism. i

Fig. 3 is a view in side elevation of a locking mechanism for the item representing wheels.

Fig. 4 isa plan view of part of the machine.

Fig. 5 is an end view of the actuating rack locking devices.

Fig. 6 is a ew of a conventional `key locking Y /longitudinal sectional view of the machine showing particularly the totalizer actuating devices. f.

Fig. 7 is a view in side elevation of the escapement devices for the item wheel carriage and the `master wheel.

Fig. 8 is a view in side elevation of the accumulator engaging devices.

Fig. 9 is a plan view of the preferred form of error correcting mechanism.

Fig. 10 is a modification showing another form of error correcting mechanism.

Fig. 11 is a front view of the friction power drive for rotating the master wheel. v

'l'he various features of the machine will now be described in sections, and where possible in a sequential manner so that the operation of the parts involved may be more clearly understood.

' Item wheel set-up devices For the present, the mannerin which the pren ferred structure sets up the numeral or item representing. wheels to control the setting of accumulator wheels will now be considered.

Secured to a shaft i0, journalled in the adding machine frames Il, I2 and I3, which are secured to a base Il, are ten sph-ally arranged stop fingers I5 one for each of ten item entering keys i5. The

Akeys I6 (Fig. 1) are slidably mounted in a guide s plate I'I and each at its lower end has a pivot connection Il to one arm IS of a bell crank loosely mounted on a shaft 20, the other inclined arm 1I of the bell crank extending upwardly so that when shifted towards shaft III by the depression 'of a key I6 a stop shoulder 22 will be placed in pendants are crowded together by depression 'of a key, the pendants thus taking up the normal free space therebetween to lock the remaining keys. a

The shaft Il, in its normal positions, has its stop fingers I5 spirally located about shaft II) so that the extent of movement of the shaft in a eounterclockwise direction (Fig. l) is dependent upon which arm 2 i is shifted, and in the case of the l key the arm II will be thrust in the path of the related fli finger I5 which will; when the shaft Il is released for rotation, permit a units movement of the shaft I0 as determined by coaction of the l" finger I5 with a stop shoulder .2l of the arm 2i shifted by the 0 key.

In the case of the I key the related stop finger II will permit a rotation of two units of shaft Il in a counterclockwise direction, and similarly the remaining keys control the differential rota-- tion of the shaft III which. in the present instance, is always a unit more than the value of the key depressed.

As will be described hereinafter shaft I0 is normally urged for rotation but is normally locked by the provision of a stop finger 26 secured to said shaft (Fig. 1). A hooked part 21 of a member 28 normally engages the stop finger 26 but is drawn out of such engagement by the operation of an integral spring urged bail 23 underlying all of the arms I9 of the ten item keys I6 and operated bythe downward movement of any key. Bail 29 is loosely mounted on the shaft 20 and the hooked shaped member 28 is integral with one of the integral side arms of the bail.

Pivoted at 30 (Fig. l) to each arm 2| is a bell crank comprising, in part, a detent arm 3| having a hooked extension 32 adapted to engage a stationary bar 33 when the related key I6 is initially depressed to thereby hold the key depressed but such action occurs before shaft III is released by disengaging the hooked part 21 of member 28 from finger 26. Inserted between the inclined upper arm 34 of the bell crank 3|-34 and a lug 35 of the related arm 2| is a compression spring 36. The upper extension of ann 34 has a cam edge 31 and since eachA finger |5 is of sufficient width (see Fig. 4) to engage both cam edge 31.

and the stop shoulder 25 integral with arm 2|, it will be observed that when the key is locked in depressed position and shaft I0 rotated the effective finger I5 will contact with the partr of the camredge 31 near the stop shoulder 25 to shift the hook 32 of arm 3| out of engagement with the bar 33 to release the key.

This disengagement occurs just shortly before the time the stop nger I5 coacts with the stop shoulder 25. The cam edge 31 is so proportioned that when engaged by a :linger I5 the arm 3| will be freed from bar 33 but, however, spring 23 does not act quickly enough to restore the arm 2| so that, as found in practice, the linger |5 actually coacts with the stop shoulder 25 thus determining the temporarily stopped position of shaft I0. T'he key is now free to be released either by relieving pressure on the key cap by the removal of operators finger or subsequently by spring 23 alone, if the operator has previously removed his finger before the shaft III is stopped.

The prime purpose of the latch mechanism and associated devices is to insure that the particu-I lar arm 2| shifted will be held shifted until engaged by the related stop finger I5 and then automatically released. When the key is released the shaft Ill will again be free to rotate since the related arm 2| has been shifted away from the associated stop nger I5. When the restora- V tion of bail 29 has been effected by a spring 38 during the' elevation of the depressed key and Ythe hooked part 21 of arm 23 is again shifted so that it can be caught by the nger 26, shaft will be stopped when the finger 26 again contacts l with the hooked part 21 of arm 28. The series of stop ngers I5 is now in normal position (Fig.

1) ready-to determine the subsequent differential rotation of shaft ||I.

Shaft |D,as will be seen in Fig. 4, extends through frame member |2 and has secured thereto a pinion 33 in mesh with a gear of a master wheel 4I) (Figs. '7 and 11) loose on a continually rotating shaft 4| and rotatable with one ele ment 42 of a friction drive, the companion element 43 having a pin and slot `connection 44 (Fig. 11) to the continually rotating shaft 4|.

The desired amount of friction between elements 42-43 is provided by a spring 45 (Fig. 11)

which is regulated by a collar 46, adjustable Aon shaft 4| by any suitable means such as a screw thread. 4To the shaft 4I there is secured a pinion 41 (Fig. 1) in mesh with a gear 48 secured to a continually running shaft 49. y

It will be observed that the master wheel 40 and the shaft Ill geared thereto are urged to rotate by power but are released for such rotation by depression'of any key. The shaft II) is then stopped in its differential position by the stop 1 devices described and then rotated, as has been described, supplementally to its normal position.

The above described differential rotation of the master wheel 40 under control of the keys is 1 utilized to set up numeral wheels'indicating the keys depressed so that upon completion of a series of key operations the numeral wheels will, by their characters, represent the keys previously depressed. y 2

Journalled between side plate I3 and a bracket 5D secured to side plate I2 (Fig. 4) is a shaft 5| carrying a yoke or item wheel carriage 52, the side .arms being 'forked to receive a shaft 53 (see Fig. 7). Betweenthe side arms of the carriage 2 and assembled on the shaft 53 is' a series of item wheels 54, each being toothed to mesh with the master Wheel 4|) and each carrying characters at the vextremities of the teeth (see Fig. 4) to indicate the value. of the key depressed. Afunits 3 movement of an item wheel 54 by a depression of the 0" key brings the 0 character into View. and correspondingly, other characters are `brought into view by depression of the other keys. 3 Between the side arms of the item wheel carriage is a sleeve 55' (Fig. 4) mounted on shaft 5I an'd inwhich sleeve there is inserted a screw stud 56 having its lower end in engagement with a spiral groove 51 formed in the peripheryof shaft 4 5|. By reason of the above arrangement steps of 5 been completed the carriage will then be shifted 5 a step to bring the rotated item `wheel out of position of engagement with the master wheel to permit the shaft ||I to thenbe given its subsequent rotation which occurs during the release of the depressedkey.A 5

'I'he worm screw threaded shaft 5| is urged to rotate by suitable spring means now to be described. In mesh with a pinion 58 (Fig. 7) secur'ed to one end of shaft 5| is an idler pinion 59 pivoted to side frame I2 and in mesh with the upper teeth of a double rack segment 6U loose on The lower teeth of said segment are in mesh with a segment 6| loose on the shaft 49 and having anarm 62 normally urged downwardly by a spring 63 to turn worm screw shaft 5| in a clockwise direction (Fig. 7) to `shift the item wheel carriage to the left (Fig 4) as the numerw als of the keys are read in Fig. 4.

In mesh with the upper teeth of segment 6|! is a pinion 54, (Fig. 7) secured to which is a toothed escapement wheel 65, both being loosely mounted on a-reduced portion of shaft I0. One tooth 66 of a double pallet escapement lever 61 normally engages a tooth 66 of the escapement wheel 65 to prevent rotationof shaft 5| as urged by spring 7 63. The escapement lever 61 is fixed to the shaft 20 and to said shaft there is fixed an arm 69 having a pin 10. Mounted over the series of arms 3| is a rod 1I of a yoke secured to a rock shaft 12 to which is pinned an arm 13 overlying the pin 10. The action of the parts is such that after the shaft Il), and, therefore, after the first item wheel 54 is differentially rotated by means of the master wheel 40 the arm 3| of the key depressed will elevate rod 1I to depress the outer end of the arm 69. This results in rocking the hooked end 66 of the escapement lever 61 out of engagement with the tooth 6B of escapement wheel 65. The latter then rotates counterclockwise slightly until one of the teeth designated by 14 engages the top of hooked portion 15 of the escapement lever. This permits a step of rotation of shaft 5I sufficient to step the carriage to bring the item wheel 5I just differentially rotated out of engagement with the master Wheel 40.

The shaft IIJ now being free subsequently rotates supplementally to its normal position and which rotation is effected during the elevation of the key depressed. During this operation an arm 16 (Fig. '7) secured to shaft I0 whips around in a counterclockwise direction and strikes a pin 11 attached to the escapement lever 61 so that the cam end of arm 16 cams the escapement lever to the left.

The escapement wheel will now turn counterclockwise and a second half step of movement of the item wheel carriage is thereby effected since the hooked end 66 has now been shifted to the left (Fig. 7) bringing it in the path of the tooth 18 of the escapement wheel 61 just below the tooth 63 previously engaged.

This second shift of the item wheel carriage causes the wheel 54 just set differentially to mesh with the first of a series of racks 19 (Fig. 6).

In this manner a depression of a key sets up an item wheel, the first one being shifted to mesh with the first rack, the depression of the second key resulting in differentially setting the second item wheel and shifting the first wheel (previously set) into mesh with the second rack, and the wheel just set differentially in mesh with the first rack.

At the end of a setting up operation the item wheels 54 set will represent a number to be printed corresponding to the keys depressed, and veriilcation of the correctness of the amount to be entered is ascertained by reading the figures on the series of wheels 54.

Dierential adjustment of racks The wheels 54 besides indicating to the operator of the machine the values of the keys previously depressed also control the differential positioning of the series of the racks 19. Referring to Figs. 4 and 6. it will be observed that the shaft 53 has a cut in its periphery preferably in the form of a long groove B0 adapted to coact with a series of resetting pawls Bi one of which is secured to the side of each item representing wheel 54 and pivotally mounted within an annular recess of the related wheel.

When a wheel 54 is rotated about shaft 53 and then shifted it is operatively engaged with the groove. The normal relation of an item wheel at home position with the groove is shown in Fig. 6. wherein it will be observed that the end of one of the series of pawls 8| rests upon the circular part of the periphery of the shaft 53. When an item wheel has been rotated by the differential mechanism it will be rotated about shaft 53 in a clockwise direction. When the shaft 53 is then rotated in a counterclockwise direction, it will be apparent that the radial wall of the groove B0 coacting withthe end of pawl 8| will pick up the related wheel 54 to restore it backwardly to its 5 normal position and for each wheel such backward restoration will require as many units oi' movement as a Wheel has been previously rotated.

An item wheel restoring operation by shaft 53 is effected by mechanism now to be described. 10 Secured to the end of shaft 53 is a pinion 32 (Figs.

4 and 7) in continuous driving engagement with teeth formed at the upper end of a segment arm 83 loosely mounted upon the shaft 49. Attached to the segment 83 and depending below shaft 49 15 is an arm 84 provided with a roller 85 engaging the race 85 of a box cam 81 secured to a shaft 88.

As will be described later this shaft 88 is given a single revolution when the item accumulating operations are to be performed during which op- 20 eration it will be observed that segment 83 will rock drive shaft 53 first in a counterclockwise direction so that the groove 80 therein will return the item wheels 54 to their normal positions.

As stated each item wheel 54 is in the form of a 25 pinion, the teeth of which when the wheels 54 have been shifted are also in mesh with the teeth of the related rack 19. As an item wheel is returned to normal, the rack 19 with which it is in mesh will be shifted to the right an amount dependent upon the value indicated on that particular wheel. After the item wheels are at zero and the racks 19 differentially adjusted the zeroized item wheels are then shifted by mechanism now to be described to the right (Fig. 4) by a 35 movement of the item wheel carriage in the same direction.

During the item wheel setting operations, it will be observed that the spring G3 (Fig. 7) will cause the arm 62 to approach the shaft 88 more 40 or less and to an extent dependent upon the number of item wheels adjusted, or in other words, proportional to the highest denomination of the amount to be entered. A restoration of arm 62 will cause the restoration of the item wheel car- 45 riage by a reverse operation of the same mechanism employed to shift the carriage step-by-step when the item wheels are successively adjusted. When the shaft B8 is rotated as an incident to item accumulating operations a profile cam 83 50 Will coact with the roller 90 carried by the arm 52 and elevate the arm 62, this operation being effected after the shaft 53 has been turned to zeroize the item wheels employed to set up a number. The elevation of arm 62 causes the 55 spirally grooved shaft 53 (Fig. 7) to be turned to shift the item wheel carriage to the starting position. During this operation it will be observed that escapement wheel B5 (Fig. 7) will be turned clockwise, the tooth 66 of the escapement lever 60 61 functioning as a retrograde preventing pawl for the escapement wheel.

When the item wheel carriage is at its normal or starting position (see Fig. 4) the shaft 53 is then rotated in a clockwise direction (Fig. 6) by the box cam 81 so as to be brought to the normal starting position shown in Fig. 4.

The differential adjustment of the racks in the present application is utilized to set up a plu- 70 rality of accumulator Wheels, but before giving a description of the mechanism and the manner of operation by which the mechanism is operated to effect the setting of the accumulator wheels, there will be described certain adjuncts provided to f prevent misoperations of the machine. These mechanisms will now be described in detail.

Alim'ng devices for item wheels It is desirable that the numeral wheels 54 be alined or locked against movement while the carriage is in its normal position. To carry out the above object there is secured to the side plate I3 a traversely extending bar 9|, Fig. 4, the extremity of which ts within the interdental spaces of a series of item wheels. Such engagement is effected when the wheels 54 are shifted to the right as an incident to the restoration of the item wheel carriage and it will. therefore, be understood that when the item wheels are in their home positions they are locked against rotation by means of the bar 9|. Obviously as the item wheels are successively shifted to engage with the racks I9 they pass out of engagement with the bar 9| but are locked by means of another locking mechanism now to be described.

Supplemental alinz'ng devices for item wheels To this end there is provided an alining bar 92, Fig. 3. Bar 92 is carried by the upper end of an arm 93 losely pivoted upon shaft 4|.

Secured to the arm 93 is another arm 94 havlng a.' roller 95 which is urged by a spring 9S connected to arm 94 to contact with the/periphery of a profile cam 91 secured to the shaft 88. The high portion 98 of the cam 91 normally maintains the locking bar 92 in its locking position, but when the item representing wheels 54 are zeroized to control the movement of racks 19 the cam 91 is rotated so that the roller 95 drops to a lower portion 99 of the cam- 91. Obviously, the movement of the arm 94 is effected by means ofthe spring 95 and such movement causes the bar 92 to be shifted out of engagement with the item representing wheels 54. Such relationship is maintained during the time the item wheels are zeroized but immediately thereafter the high part 98 of the cam 91 is again effective to rock the bar 92 into engagement of the item representing wheels 54 keeping them'locked during the lateral shifting of the item wheel carriage and until the item wheels pass under control of the fixed locking bar 9|.

Devices for unlocking operating racks Referring to Figs. 4, 5 and 6, loosely mounted on a rod |00, is a series of locking pawls IOI. The left ends of the pawls IOI are so weighted that gravity urges integral locking portions |02 thereof to normally t in recesses |03 formed in the upper edges of the left ends of the series of racks 19. 'I'he portions |02 prevent accidental movement of the racks, but when the item wheel carriage is shifted the pawls are successively operated to unlock the racks which are utilized in the item accumulating operations.

To this end a bar |04 secured to the cross plate lof the item wheel carriage has a beveled portion |05 (see Fig.) 5) which passes over the rearward ends of the pawls IOI to shift them so that by the disengagement of the locking portion |02 and the recess |03 the related rack 19 is unlocked. As a pawl IOI is operated it is held in shifted position by a straight edge |06 forming the lower straight edge of the bar |04.

In this manner ifY four item wheels 54, for example, are set to represent a number the corresponding racks 19 are unlocked for operation.

Alining devices for racks 79 For the purpose of alining the racks 19 in the di'erent positions of adjustment there is inserted in holes in a stationary bar |01 a series of resiliently urged balls |08 (see also Fig. 9) There is provided a ball |08 for each rack 19 and each coacts with the related series of wedge-shaped notches |09 formed at the lower edge of the associated racks 19. It is obvious that by the above construction the racks 19 are resiliently held in different positions of adjustment.

Accumulating devices The accumulating devices in the present machine comprise a series of accumulating wheels I I0, each of which is in operative alignment with the related operating rack which is slidably mounted upon the associated rack 19.

In view of the fact that it is necessary that the accumulating wheel I I0 be turned an amount commensurate with the number indicated on the related item wheel 54, a lost motion connection is provided between the short rack III and the related rack 19 on which the former is slidably mounted.

This lost motion connection consists of a unit of movement of the rack 19 which extra unit of movement is derived in setting up the item wheel 54 since it will be recalled that the item wheel is turned one step greater than the amount represented by the controlling key. 'I'his extra step of movement, as more fully shown and described in the parent application, is utilized to adjust printing wheels to the proper positions. The printing wheels have blank portions thereof presented to the printing line the extra step being utilized to adjust the printing wheel to present a zero" to the printing line. As the printing mechanism is not involved in the present application no further description of its operation will be given.

As best shown in Fig. 6 each rack 19 is slidably mounted upon a rod ||2 and a rod II3, each of which fits in suitable elongated slots formed in the racks 19. Each rack II| is slidably mounted upon the associated rack 19 by means of pins II4, II5 carried by the rack 19 and fitting in elongated slots formed in the rack I I I. A spring IIS, one end of which is connected to an ear I|1 integral with the rack II I and its other end connected to an ear IIB integral with the rack 19, tends to shift the rack I to the left, Fig. 6, independent of the rack 19 and such action is normally prevented by means of a. lug II9 integral with the rack which lug normally engages a hook |20 of a transfer controlling arm I2`I. The nonnal relationship of the llug II9 and hook |20 at the beginning of an item entering operation is shown in Fig. 6 and it will be, therefore, obvious that when the rack 19 is shifted to the right a differential amount, the rack 19 will move one step independent of the movement of the rack III.

At the termination of this first step of movement of the rack 19 the pins II4 and II5 will coact with the right end of the related slots formed in the rack III and the latter will then be given a differential movement commensurate with the value of the numeral key depressed and correspending to the amount exhibited by related item wheel 54. As has been premised, hereinbefore, the racks 19 are rst given differential movements and then restored to normal and during this restoration the accumulator wheels III are engaged with their operating' racks so as to be differentially actuated.

The accumulator wheels are loosely mounted upon a shaft |22 which is carried by a frame |23 loosely pivoted on a rod |24. The accumulator wheel carrying frame |23 is adapted to be rocked about the pivot |24 so as to intermesh the accumulator wheels ||0 and the operating racks and such relationship is elected by mecha.- nism best shown in Fig. 8. A slide |25 is slidably mounted by means of a pair of stationary studs |26 and |21 and said slide is provided with a. cam slot |28 in engagement with the shaft |22 which, it will be recalled, is carried by the accumulator wheel supporting frame |23. A downward extension of the slide is provided with an open notch |29 in which fits the upper extremity`of an arm |30, the latter being pivoted on a rod |3| and provided with a roller |32 engaging the cam race |33 of a box cam |34 secured to the shaft 88. When the racks have been differentially adjusted the cam race |33 rocks the arm |30 so as to shift the slide |25 to the right, as viewed in Fig. 8. The cam slot |26 will depress the shaft |22l thus rocking the accumulator frame |23 about its pivotal point |24 so as to intermesh the accumulator wheels ||0 and the operating racks Thereafter the operating racks are restored to normal by mechanism now to be described.

Each rack 19 has a downward projecting portion |35 (Fig. 6) ILoosely mounted upon the rod l3| is a yoke shaped frame comprising arms |36 and a cross bar |31, one of the arms |36 having a roller in operative engagement with the-cam race |38 formed in the box cam |39 which is secured to shaft 88. The cam race |38 is so designed that when the racks 19 are shifted to the right a. differential amount the cross bar |31 will be simultaneously shifted so as not to interfere with the differential setting of the racks 19'. After the racks have been differentially set, the cam race |38 is then active to restore the cross bar |31 to normal, but prior to such restoration the accumulator wheels ||0 are engaged with the racks The bar |31 will thereupon engage the downward projecting portions |35 of the racks 19 which have been shifted from normal. It will first encounter the rack or racks 19 which have received the greater extent of movement and thereafter, in order, restore to normal those racks which have been moved lesser amounts. In this manner the racks 19 are positively restored to normal positions and the accumulator wheels actuated differential extents so as to indicate the amount represented upon the item representing wheels 54.

Transfer mechanism The transfer mechanism provided in the machine is fully shown and described in the parent application, and as it forms no part of the present invention, it will not be described herein.

Motor bar control i the gear |85 lThe error key lever stem slidably guided at its upper end and pivoted at its lower end by an arm |16. The stern carries a pawl |11 (Fig. 1) the lower end of which is adapted to engage one arm |18 of a bell crank, the vertical arm |19 being pivoted to a link |80 which is secured to the lower end of a pinion carrying frame comprising parallel plates |8|a and |8|b both loosely mounted on shaft 49 (see Figs. l and 4). Secured to the constantly running shaft 49 is a pinion |82 in mesh with an idler pinion |83 plate |8|a. Pinion |83 is in constant mesh with a broader pinion |84 also pivotally mounted on plate |8|a. The pinion |84 when rocked into mesh is suiliciently broad to mesh with and drive pivotally mounted on the frame a pinion |85 secured to the cam carrying shaft 88.

A spring |86 (Fig. l) connected to the frame |8|a|8|b retracts the latter so that a normal disengagement is effected between pinions |84 and |85. When the motor bar is depressed pawl |11 rocks bell crank |18|19 to shift the link |80 so that when the pinion carrying frame is rocked sufiiciently -to eiect a driving engagement between pinions |84|85 a lug |88 of a spring urged latch arm |81 will spring behind a projection |89 of frame plate |8|b. Shaft 88 will now be driven to eiect the various functions described. Towards the end of a. complete revolution a pin |90 secured to gear |85 will coact with a tail of the latch arm |81 to rock the latter permitting spring |86 to restore the frame |8|a|8|b to effect a disengagement between pinion |84 and gear |85.

When stem |15 is depressed pawl |11 will rock the bell crank and by the coaction of a tail of the pawl with a fixed stud |9|a the pawl will be rocked in its downward movement and will pass by the arm |18 after the pinion carrying frame is rocked to be latched by pawl |81. The engaging end of pawl |11 now being below the arm |18 it will be observed that repeated operations of the shaft 88 cannot be effected by holding the motor bar depressed. The provision of the above non-repeat device requires restoration of the motor bar and a subsequent depression Ifor each operation of the drive shaft 88.

Secured to an extension |9| of plate |8|b is a plate |92 the lower concentric edge |93 being adapted to be engaged by a pin |91 secured to rotatable with shaft 88. The passage of the pin |91 beneath the concentric edge also retains initially the desired clutching engagement of the drive and driven pinions and this is maintained after the pin has cleared the edge |93 by the concentric edge |96 of disk |95 coacting with the lower edge |93.

Error key mechanism (Figs. 6 aru9) In the event that any of the keys I6 are depressed in error it is desirable that the item representing elements 54 be restored to normal without transmitting the value represented on them to the accumulator.

It will be remembered that it was previously stated that the rod |2 was the supporting means for the racks 19 at their forward ends, as will be best seen in Fig- 6. This rod is carried by a pair of arms 20| (Fig. 9) fixed to a. cross rod 202 supported in the machine side frames I2 and |3. 203 is pivoted upon a rod 204 and the handle portion thereof projects through a slot in the cover plate of the machine so as to be externally operable by the operator of the machine.

Articulated to the mid-portion of the error key it will be observed that the teeth formed at the upper forward ends of the racks 19 are in mesh with the pinion teeth of the item representing elements 54 which have been shifted laterally. If at the termination of such an operation the operator observes that the amount represented is incorrect, for rectification, it is only necessary to shift the lever 203 rearwardly. During such operation, it vwill be seen that the action of the cam slot 208 upon the supporting rod ||2 is such that the rod H2 will be lowered thereby effecting a disengagement between the teeth of the racks 19 and the teeth of the laterally shifted item representing wheels 54. l

During the subsequent machine operation it will be observed that the restoring shaft 53 will be rocked to pick up and restore the previously set item wheels 54 but during such operation, it will be noted that no movement will be transmitted to the racks 'I9 and that they will merely remain in their normal position of adjustment. By the provision of such means, it will be observed that the machine goes through an idle cycle of operation and the only effective work that is accomplished is the restoration of the item wheels 54 and the restoration of the item wheel carriage.

For the purpose of defining the normal or zero position of the item representing wheels when they are restored during the resetting operations there is secured to the item wheel carriage a plate 209 (Fig. 6) having a plurality of stop fingers 2|0 against which pins 2H secured to the side faces of the wheels 54 abut at their zero positions.

For the purpose of automatically setting the machine into operation by shifting of the error key 203 when employed, the error key lever 203 has a curved extension 2I2 (Fig. 6) carrying a stud 2|2a in the plane of the arm |16 and adapted to depress this arm and therefore, motor bar |14 when the lever 203 is shifted to the rear.

While the lever 203 may be held in shifted position at the end of the machine cycle no second operation of the machine will ensue for the reasons explained in connection with the motor bar |14 described in the section designated Motor bar control--.

interlock For the proper performance of the machine it is desirable that an interlock be provided between the adding keys IB and the error key lever 203.

The error key lever 203, as stated, is secured to the shaft 204, and also secured to the shaft 204 is a rearwardly extending arm 2| 3 (Fig. 6) having its extreme edge 2I4 concentric with respect to the shaft 204.

As previously stated the shaft 20 is reciprocated during the operation of the adding keys and secured to this shaft is an arm 2|5 having an edge 2|6 adapted to pass beneath an edge 2|1 of the arm 2i3 to lock the error key lever 203 when an adding key isdepressed. This mechanism prevents shifting of the error key 203 during the operation of an adding key I6.

Shifting o f the error key lever 203 causes the edge 2|4 of arm 2|3 to pass in front of a concentric edge 2|8 of arm 2| 5 to lock the shaft 20 and therefore the adding keys while the error key lever 203 is away from its normal position.

Modification of error key mechanism As has been stated hereinbefore, restoration of 5 the differentially set item wheels Without an entry to the accumulator was performed by preliminarily lowering the racks 19 and holding them in their lowered position during the timeV the item wheels are zeroized and the item wheel l0 carriage is returned.

Another construction by which errors made in setting up of the wheels 54 may be rectified is as follows, referring to Fig. 10.

In this arrangement the shaft H2 (Fig. 6) 15 supporting the left ends of the racks 19 is xed. The new device which may be employed comprises a bell crank secured to shaft 204. The arm 2| 0 of said bell crank has pivotally mounted at its extremity by pivot pin 220 a by-pass pawl 22|, the rearward extremity of which coacts with a shoulder 222 of an arm 223 which is integral with the escapement lever S1. Between the left end of pawl 22| and a lug 224 integral with arm 2|9 is a spring 225.

It should be explained at this point that if an item has been set up a certain number of the item wheels 54 will be shifted laterally into mesh with the racks 19. If an error is detected the error key lever 203 is shifted to the rear as pre- 3G' vlously explained. In so doing the pawl 22| will strike the shoulder 222 and by the coaction of a pin 226 carried by arm 2|9 with the left end of pawl 22| the latter will be prevented from turning so that the free end of arm 223 of escape- 35 ment lever 51 will be depressed. This will cause the hook 66 to be disengaged from the tooth 68 of escapement wheel 65 but will bring the hook 15 under the tooth 14 of the escapement wheel 65, permitting the escapement wheel to rotate slight- 40 ly, as previously described. 'Ihis causes a step of movement of the item wheel carriage to bring the item wheels 54 that have been set out of mesh with the racks 19 and in between them.

The other arm 221 of the bell crank secured to 45 shaft 204 has a link connection 228 to an irregular shaped member 229 pivotally mounted on a stud 230. 'I'he link 228 is conected to the member 229 by means of a pin 23| fitting in an elongated slot 232 in the extreme end of the link 50 220. Under actionof a spring 233 attached to the member 229 it will be observed that when the link 228 is shifted to the right by a corresponding movement of the error lever 203 a hook 234 will catch over a pin 235 secured to the 5.5 escapement lever 61 thereby holding the latter in its shifted position and which was previously caused by the rocking of the arm 223.

After the initial step of rotation of the escapement wheel 65 has been effected the arm 2|2 60 which is integral with the error key lever 203 will cause the depression of the motor bar |14, as previously explained so that during such operation the item wheels 54 will be zeroized and the item wheel carriage shifted to normal.

During the restoration of the item wheel carriage it will be recalled that the escapement wheel 65 is turned in a counterclockwse direction. For the purpose of unlatching the escapement lever so as to permit rotation of the es cape- 70 vment wheel in this direction the member 225 is provided with a pin 236 which, when member 229 is in the position to latch the escapement lever 51, is in the path of one of the teeth of the escapement wheel and .by its engagement with the in- 75 observed that the slot 232 permits this movement of member 229. Therefore, an uninterrupted rotation of the ratchet wheel in a counterclockwise direction will ensue.

Since the error key 203 is still in the shifted position it will be observed that the extremity of pawl 22| is considerably below the left extremity of arm 223. By means of theby-pass pawl` 22| ,the error key lever 203 may be shifted to its normal position without affecting the position of the arm 223.

What is claimed as new is as follows:-

1. In a computing machine the combination with a series of numeral keys, of a plurality of item wheels for representing the values corresponding to the keys depressed, a master wheel for differentially operating the wheels seriatm. a power driven shaft, a shaft for controlling the master wheel carrying a plurality of stops arranged splrally about the shaft, a friction drive between said power driven shaft and said controlling shaft, means controlled by said keys for releasing said controlling shaft to permit the master wheel to be driven by said power driven shaft to set an item wheel, means individual to each key for arresting said controlling shaft by said stops, means for thereafter causing said power driven shaft to give a supplemental rotation to the shaft carrying said stops, resilient means effective before the operation of the last named means to effect a relative displacement between said master wheel and the item wheel set, and means for causing the power driven shaft to store up power in said resilient means.

2. In a computing machine, the combination with a series of numeral keys, of a plurality of item wheels, a master wheel, means for effecting successively an operative relationship between the item wheels and said master wheel for setting up said item wheels seriatim, means for differentially controlling the operation of said master wheel comprising a differentially rotatable shaft carrying a series of stops spirally arranged about said shaft, means for causing rotation of said shaft whereby said keys coact with said stops to control the differential positioning of the item wheels, and means for causing the last named means to effect a supplemental rotation of said shaft after the differential rotation of the latter.

3. In a computing machine, the combination with a series of numeral keys, of a plurality of item wheels, a master wheel for setting up the item wheelsseriatim, a power drive for said master wheel, a shaft having a permanent driving mechanical connection Pto said master wheel and comprising a plurality of stops spirally arranged about said shaft for controlling by rotation from normal the differential operation of said master wheel, means common to the keys for releasing the shaft and master wheel for operation by said power drive, means individual with each key coacting with said stops, and means for causing a relative displacement between the item wheel which has been set up and said master wheel to allow the shaft to resume its normal position.

4. In a computing machine, the combination 'with a series of numeral keys, of a plurality of item wheels, a master wheel, means for effecting successively an operative relationship between said item wheels and said master wheel, for setting up the item wheels seriatim, a shaft carrying a plurality of stops spirally arranged about the shaft and coacting with said keys to determine the differential rotation of the shaft, a power drive for said shaft, means common to said keys for releasing the shaft for differential rotation by said power drive, and means for ca using the power drive to rotate the shaft supplementally in the same direction as its differential rotation.

5. In a computing machine, the combination;

with a series of numeral keys, of a series of item wheels, a master wheel for setting up the wheels seriatim, a master wheel control device comprising a unidirectionally rotatable shaft geared to the master wheel and having a plurality of 3 fingers spirally arranged about said shaft coacting with said keys and differentially controlled thereby, and means for causing a rotation of said shaft in the same direction after each key causes its differential rotation.

6. In a computing machine, a series of keys, a

series of item wheels, a master wheel driven unidirectionally for setting the item wheels, means comprising a shaft carrying a series of fingers spirally arranged about a. shaft and coacting with the numeral keys for differentially controlling by a differential rotation thereof the uni-directional rotation of the master wheel, and means under control of the keys for causing a relative movement between the item wheel and master wheel whenan item wheel is differentially set, and for causing concomitantly a supplemental rotation of the shaft in the same direction as its differential rotation.

7. In a computing machine, a series of item:

wheels, a series of keys, a master wheel for separately setting the item wheels, means under control of said keys for differentially controlling the extent of operation of the master wheel and a single litem wheel, and means whereby each of said means and the master wheel are controlled to receive a supplemental operation of a complemental extent after having been differentially set.

8. In a computing machine, a series of keys, a

series of item wheels, a master wheel for setting 1 the item wheels seriatim, means controlling the differential setting of the master wheel comprising a differentially rotatable shaft carrying a set of fingers spirally arranged about the shaft and coacting with the keys, and means whereby said shaft is restored to normal by a rotation in the same direction as its differential rotation after differentially setting the master wheel.

9. In a computing machine, a totalizer, a series means, means operated by said power driven means and including a master wheel under control of said keys for differentially setting each of the item wheels separately by successive operative engagement with each of the series of item wheels, a plurality of racks, means for positively restoring the item wheels to differentially set the racks, and means for causing said power driven means to move said racks to operate the totalizer to register thereon the amount represented on the item wheels.

10. In a computing machine, a totalizer, a series of item wheels, a series of keys, a power driven means, means operated by the power driven means and including a master wheel under control of said keys for differentially setting the item wheels, a plurality of racks, means operated by the power driven means for positively restoring the differentially set item wheels to differentially set the racks, and means operated by the power of item wheels, a series of keys, power driven` wheel means under control of said keys and opeI-,

ated by the power driven means for differentially setting the item wheels by said master wheel, a plurality of racks, means operated by said power driven means for positively restoring the differ entially set item wheels to differentially set the racks, and means operated by the power driven means for causing said racks to be positively restored to operate the totalizer to register thereon the amount represented on the item wheels.

12. In a machine of the class described, the combination of a series of keys, a. series of item wheels set by said keys, operating devices differentially set by said item wheels after the latter are shifted into engagement with the operating devices and restored, and an error key having provision of means whereby said item wheels are shifted to a position intermediate said operating `devices whereby the item wheels are restored without setting the operating devices.

l3. In a computing machine, a series of keys, a series of toothed item wheels, a series of totalizer racks, a rotatable master gear, power means for rotating the master gear uni-directionally, means under control of said keys for causing the differential rotation of said master gear to cause a single item wheel to be separately set and then causing the master gear to be supplementally rotated whendisengaged from the item wheel set, and means for gearing the item wheel set with one of the totalizer racks before another item wheel is set by said master gear.

14. In a machine of the class described, in combination, a series of keys, item wheels, means for causing the differential positioning of said item wheels under control of said keys, a series of actuating devices differentially positioned upon restoration of said item wheels, an escapement mechanism controlling engagement of the item.

wheels with said devices, and means for causing said escapement mechanism to position the differentially positioned item wheels intermediate said actuating devices for restoration of the item wheels independently of actuating said devices.

l5. In a machine of the class described, in combination, a series of keys, a series of item wheels, a power drive, means including a single master wheel operated by said power drive and under control of said keys for successively differentally positioning said item wheels, a series of operating devices, means operated by said power drive to differentially position said operating devices under control of said item wheels, and means operated by said power drive to restore said operating devices from their differential positions. b

16. In a machine of the class described, in combination, a series of operating devices, a series of keys, a series of item wheels, a power drive, a master wheel, means operated by said power drive and under control of said keys for 10 differentially rotating said master wheel to successively sei*l up the item wheels, mechanical means comprising a friction drive between said power drive and said master wheel, means operated by said power drive to reset the item wheels to differentially position said operating devices, and means operated by the power drive to restore the operating devices from their differential positions.

17. In a machine of the class described, in combination, a series of operating devices, a series of keys, a power drive, a series of item wheels, means operated by said power drive and under control of said keys for setting said item wheels differentially, escapement means for causing an item Wheel set to be disengaged from the setting means and engaged with one of said operating devices before another item wheel is set, means operated by said power drive for causing said operating devices to be moved differentially under control 80 of the item wheels set, and means operated bythe power drive to restore the operating devices from their differential positions.

18. In a computing machine, the combination with a series of keys, of a series of item wheels,`a power drive, a master wheel for setting up said item wheels seriatim, a master wheel control device comprising a shaft with a plurality of fingers spirally arranged about said shaft and adapted to coact with said keys, a friction drive comprising one element rotatable with said power drive and a normally contacting` companion element which is rotatable with said shaft, locking means for normally preventing the rotation of said shaft and of the element rotatable therewith, common means under control of said keys for causing said locking means to be ineffective whereby said friction drive is then effective to turn said master wheel and said shaft, and means individual to each key and cooperating with said fingers to first determine a differential rotation of said shaft corresponding to the key depressed, and subsequently to allow a further complementa] rotation of said shaft.

FREDERICK L. FULLER.

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