US1764978A - Combined typewriting and computing machine - Google Patents

Description

H. 1 PITMAN 1 COMBINED TYPEWRITNG AND COMPUTING MACHINE Filed May 16, 1923 5 Sheets-Sheet l I June 17, 1930.

June 17, 1930. H L, PITMAN 1,764,978

COMBINED TYPEWRTING AND COMPUTING MACHINE Filed May 16, 1923 3 Sheets-Sheet 2 June 17, 1930. H. L. PITMAN COMBINED TYPEWRITNG AND COMPUTING MACHINE Filed May 16, 1923 5 Shees--Sheerl 3 Patented .lune 17, 193

P E i FFICE HENRY L. PITEAN, 0F WESTFIELD, NEW JERSEY, ASSIGNOR, BY ll/ISNE ASSIGNMENTS,

T0 ELLIOTT-FISHER COMPANY, 0F NEW YORK,

N. Y., A CORPORATION'OF DELAWARE COMBINED TYPEWRITING AND COIVIIUTING MACHINE vApplication filed May 16, 1923. Serial No. 639,266.

This invention relates to computing machines, and is herein illustrated as applied to an Underwood combined typewriting and computing or bookkeeping machine.

One feature of the present invention is the provision of many lmore dials in a totalizer than have heretofore been found practicable in a machine in which a number is set up on indexing devices preparatory to being run into the totalizen v @ne of the diiiiculties in devising a totalizer'capable of computing in sextillions, for

example, is that the ordinary transposition mechanism is adequate for only a small number of decimal places. This is the mechanism which causes the typewriter carriage,l as it proceeds from right to left, to select the denominations from left to right.

Another dilhculty is the carry-over mechanism, which usually includes a shaft rotated by the general operator, and having spurs thereon sulicient for driving the wheels of an ordinary size totalizer seriatim, but incapable of handling a totalizer of say double such size.

A feature of the invention consists in the provision of means for effecting the carryover in the register in stages, for example, by successive rotations of a carry-over-completing shaft. Heretofore each register in said bookkeeping machine has been limited to about eleven computing bars, a set of dialwheels, one for each of said bars, and an additional dial-wheel of higher order receiving l carryovers only from the highest order dialwheel of said set. lt will be evident that by effecting the carryovers in stages, use may be made of registers of greater capacity than the one to which reference has been made.

The transposition mechanism may be composed of a plurality of sets of transposition devices of forms now in use, thus avoiding redesigning of the transposition devices and serving other purposes to be brought out hereinafter. Each set forms a unit. These units have a transposed relation. The transposition devices of each set are actuated by corresponding sets of jacks, and,

in order to select denominatians from the highest to the lowest in order, it is necessary disks of the different sets to actuate seriatim from right to left the jacks of the left-hand set and then of the next set to the right. To this end, the forward ends of the jacks of the different sets are 0E- set so that a denomination-selector may first actuate the left-hand set of jacks seriatim, and, upon the completion 'of this operation, another selector may actuate seriatimifhe ofi'- set jacks of the second set. With this arrangement, it is evident that the edective capacity of the register may be varied by throwing the left-hand selector or selectors out of operation.

To effect .carryover for the sets ,ofdialwheels corresponding to the different sets of computing bars and transposition devices, provision may be made of mechanism to eect' carryover in the lirst set of dial-wheels and then in the second set, and, in case of a greater number of sets, in the other sets successively. Heretofore, where a single set of computing bars and transposition devices has been used for each register the carryover has been completed by a single rotation of a shaft actuated by the general operator onlypin its rearward movement. According to the present invention, the shaft for completing the carryover must be rotated once for each set of computing bars associated with the register. 'To this end, provisionmay be made of suitable motion-multiplyingmechanism between the general operator and the shaft for completing the carryover.

As herein disclosed, the shaft for completingthe carryover is provided with disks having toothed portions or spurs to engage. pinions forming part of the intermediate carryover elements settable by the dial-wheels in passing from 9 to 0, the spurs being arranged helically. These disks are provided 'v with obstructions or stops, onel for each carryover pinion on the intermediate elements, so as to prevent overthrow when an intermediate element is actuated by a dial-wheelv moving from 9 to 0,. The corresponding may be ofthe same shape with one exception, namely, the carryover-completing disk associated with the carry-over pinion of the lowest order in a set of higher order (left-hand set) differs may be advanced ion,

- or projection resting on the periphery of .gap

from the disk of lowest order of the set of lower order (right-hand set). This pinion one step before the corresponding disk is brought to its initial osition at the completion of a rotation o the carry-over-completing shaft, and to permit such advance movement of the pinion, a portion of the associated carr -over-completing disk 'has been cut out. onsequently, the overthrow-preventing obstruction is eliminated from this disk, and to prevent overthrow of the corresponding carry-over pinprovision is made of a pivotally-mounted paw having at its front end an obstruction normally lying in the path of the teeth of the carry-over pinion and at the other end a tooh t e associated carry-over-completing disk; the

provided to permit rotation of the pinion being extended to a point such as to permit release of the pawl at the proper time.

. chine.

Other features and advantages will hereinafter appear.- l

In the accompanying drawings,

Figure 1 is a diagrammatic side elevation, partly in section, showing the invention applied to an AUnderwood bookkeeping ma- Figure 2 is a fragmentary front view, partly in section, showing the operating connection between the general "operator and the carry-over-completing shaft.

' Figure A3 is a top plan view of the comuter, parts being omitted to show the underyin structure.v

Figure 4 is a View, from the left, of the dial-wheels and carry-over mechanism, showing theI carry-over-completing disk of the set of lowest order and the corresponding dial-wheel with its carry-over tooth in position to actuate the intermediate carryover element in passing from 9 to 0.

Figure 5 is a view similar toFi-gure 4, showing the intermediate carry-over element advanced one step by the carry-over tooth of the dial-wheel and held against overthrow by the carry-over disk of lowest order.

Figure 6 is ,a view similar to Figure 5, showin the carry-over disk of highest order in the rst set in engagement with the corresponding intermediate carry-over element, to carry-over from the dial-wheel'of highest order of the first set to the ,dial-wheel of lowest order of the second s'et. f

Figure 7 is a View showing the carry-over element after a partial rotation by the dialwheel of the highest order of the lowest set, and the corresponding carry-over completing disk about to complete the carrying-overrotation, to the wheel of lowest order in the highest set.

Fi ure 8 is a view similar to Fi re 7, but showing the disk of lowest order 1n the second set 'in position to permit the intermediate carryover to be set by the 12th dial, the

vout of enagagement wit disk having a suitable cutout for this Vpurpose.

Figure 9 is a view showing the carr -overcompleting disk of lowest order in t e first set in the position corresponding to that of the disk Figure 8 and locking the corretion of the lowest or right-hand set of jacks.

Upon depression of numeral-keys 11 of the typewriter, key-levers 12 act through bellcranks 13 to swing type-bars 14 to print against a platen 15 mounted in a carriage 16. The carriage 16 is mounted upon front and rear rails 17 and 18, respectively, and is urged to the left by the usual spring-drum not shown. To control the movement oi the carriage 16, provision is made of a rack 19 connected with the carriage 16 and normall in mesh with a pinion 20 having the usua one-way connection with an escapement wheel 21, which, in turn, is controlled by fast and loose dogs 22 and 23, respectively. As each type-bar approaches its typing position, a heel 24 thereon engages a unlversal frame 25, thereby shiftin the loose dog 23 wheel'21,.and the fast dog 22 into engagement therewith.` Upon the return of the actuated type-bar to its normal position, the fast. dog 22 will be withdrawn and the loose dog 23 brought into engagement with the escapement wheel 21, thereby ermitting an advance movement ofthe es apement wheel 2l 1n the usual manner.

The numeral-keys 11, with theexception of i the"0f key, have stems or pendents 26 to depress arms .27 on rock-shafts 28 provided with arms 29 connected with linkages 30 to depress bars 31 for setting index-pins 32 on computation bars 33.

The pins 32 are normall out of alignment with the bars 31, but, as t e carriage travels across the machine, a denomination-selectorA 34 is raised into eiiective position by a frustoconical roll 35 thereon riding up on a lifting roller 36. Upon further movement of the carriage, a selector-dog 37 on the selector will engage and cam upwardly lthe front ends of a set of jacks'38, thereby ,rocking the jacks about a pivot 39 and depressing links 40 to rock bails 41 supported on a fulcrum- `rod 41'* of a transposition dev-ice 42, thereby advancing seriatim the ,computation bars 33 of a set corresponding to the jacks 38, so as to bring the pins 32 into vertical alignment with the bars 31. When one of the compun tation bars 33 is so advanced,-depression of a plu-setting' bar 31 will set the correspondputer a segment 45 meshin ring to the active jacks 38, the computation of the number so indexed may be effected by pulling forward -a handle 43 and then returning it to its normal position. This handle is mounted upon the end of a shaft 44 having fixed thereon at each side of the comwith an idle pinion 46, which, in turn, mes forming part of a general operator, indicated in general by 48. The forward movement of the handle 43 will effect forward movement of the general operator 48 and cause a crossbar 49 thereon to engage ythe lower ends of the-depressed pins 32 and advance the coml bars 33 are provided with Aputation bars 33 distances corresponding to the numerical values of the digits indexed.

At their forward ends, the computation racks 50 engaging with pinions 51 having one-way connecl tions with dials 52, such that the forward movements of the computationbars 33 will advance said dials an extent corresponding to the forward pin-set movements of the corresponding computation bars 33, and, upon rearward movements of the computation bars 33, the pinions 51 will revolveA idly with respect to the corresponding dials 52. Toothed wheels 53 are iixed to the different dials 52, and coperate with detents 54 urged against them by springs 55, so that the dials will be Iheld in proper sition u on completion of the drive thereo and will e prevented from l accidental movement during the rearward movement of the computation bars 33. Durmg the rearward movement of the general operator, carryover between the dials will be effected by means to be described hereinafter. The mechanism described so far may be in general similar to that disclosed in my Patent No. 1,370,360, dated March 1, 1921.

As herein disclosed, use is made of a register of substantially twice the usual capacity, and the usual transposed actuation of the computation bars 33 is effected by 'using twocomplete transpositionsets or units side by side, as shown in Figure 3, each set being of suiii'ci'ent capacity to control eleven com- Veo putation bars. Obviously, the left-hand `or highest transposition devices 56 must be ac- ,f ftuated before the lower vices 42 are actuated.

To operate the elements of the transposition device 56, use is made of a set of thrust links 40 corresponding to those used in con-L nection with the transposition device 42v and of a set of jacks-59 similar to the jacks 38 but having their forward ends oi'set or elongated forwardly, as shown in Figure 1, to enable them to` be operated independently of the jacks 38. Provision must also be made of an additional denomination-selector 60 having es' with a rack 47 transposition dethereon 'a selector-dog 61 to engage the forward ends of the jacks 59, the selectors 34 and 60 being so ositioned that, as the selector 60 completes t e actuation of the jacks 59, the selector 34 will be brought into operation on the jacks 38. Usually the length of a lifting roller, such as 36 is substantially thev width of a set of jacks, but in the present case it is made of sufficient length to extend from the upper end of the set of jacks of highest order to the lower end of the set of jacks of lowest order, as shown in Figure 10.

Each dial 52 is provided with a carry-over tooth 62 so positioned that while the dial 52 is movng from 9 to 0 in each revolution,

rthe tooth will engage one of the teeth of a pinion 63 and turn the pinion substantially oneninth of a revolution to start the tenscarryin train of which the pinion vforms a part.V he pinion may be detained in the various positions to which itis shifted by means of a spring detent comprising a ball 64 mounted in a cylindrical opening 65 in a shaft or rod 66 on which the pinion 63 is loosely mounted, the ball 64,/being pressed outwardly by a spring 67 so as to engage in openings y68 provided at suitable intervals in the pimon 63.

The pinion 63 forms part of an intermediate carry-over element which also includes a three-toothed pinion 69 to mesh with the toothed wheel 53 of the dial of next higher denomination. Each intermediate element, in completing the carryover, is turned altogether'through one-third of a revolution, so that the three-toothed pinion 69 secured thereto will turn the toothed wheel 53 connected with the dial of next higherdenomination through one-tenth of a revolution.

To complete the action of the carry-over trains which have been operatively set by carry-over teeth 62, provision is made -of carry-over-completing means operable by the general operator during itsreturn movement, and comprising a carry-over-completing element 70 to co-operate with each` pinion 63. The carry-over-completing elements are mounted on a square portion of a shaft 71 rotatably supported by pins 72 projecting into openings in the ends thereof. Said pins 72 project inwardly through the inner ends of 79, forming part of a rotatable part 80, 1.'.

comprising also aI pinion 81 meshing with theleft-hand rack 47 of the general operator.

The gear and pinion are so proportioned that the pinion 78 is turned through two complete revolutions. during a stroke of the general wardly from the operator in either direction. The rotatable member 80 is mounted onl a/pivot 82, passing nection between the sleeve 77 and the shaft 71,

comprising a collar 86 fixed on the shaft 71, adjacent the enlarged inner end of the sleeve 77, by means of a screw 87, and carrying a pin 88 to engage in a notch 89 in said enlarved inner end of the sleeve 77.

'fhe pin 88 is mounted in a cylindrical opening 90 in the collar 86 and has a reduced part 91, extendingthrough an opening 92 of smaller diameter than the opening 90, and a button 93 at its outer end to limit its movement to the left (Figure 2) under the action of a spring 94. During the forward movement of the general operator, the pin 88 will.

be cammed to the right by the inclined surface 95 at one side of the notch 89, and the shaft will remain at rest. During the return movement of the general operator, the pin 88 will serve to connect the shaft 71 with the sleeve 77 to be moved therewith.

The carry-over-completing elements 70 may be in the form of disks having toothed portions or spurs 96 arranged helically in successive coils, the corresponding spurs of corresponding elements 70 of the different sets being in alignment. All of the elements 70 of the set of lowest order are rovided with overthrow stops or shoulders 9 all of which .i are in alignment and are normally positioned (Figure 4) so as to project into wide gaps between the teeth ofthe pinions 63 which correspond to nine-toothed pinions with every third tooth omitted.

As illustrated in Figures 4 and 5, for the carry-over train of lowestl order, the dial, in passing from 9" t0 0, shifts the intermediate carry-over element to the position shown in Figure 5, w1th,a tooth of the pinion 63 in engagement with' the stop 97. When the shaft 71 is rotated, the stops 97 are withdrawnfrom their effective positions and the spurs 96 engage the teeth of the operativelyset pinions 63 and advance them two steps to complete for each the movement of one-third I.. of a revolution.

Each element of the first set has a circular dwell-portion 98 extending from the spur 96 to the stop 97 and engaging in the next wide gap between the teeth of the corresponding pinion 63, to lock the same as soon as the spur becomes disengaged therefrom. As indicated in Figures 4 and 6, the dwellportions 98 of the elements 70 decrease progressively from that of the diskl of lowest order, shown in Figure 4, to that of highest will be seen that the carry-over mechanism for the first set of dial-wheels is, in many respects, similar to that disclosed in the patent tto ghornton, No. 1,228,148, dated May 29,

The elements 70 of the second set, or any higher set of elements 70, are, with the eX- ception of the first element of the set, the same as those of the first set. When the shaft 71 reaches the position shown in Figures 8 and 9, a carryover may be effected from the dial of highest order of one set to the dial of lowest order of the next set, and if this causes the movement of the last-mentioned dial from 9 to 0, the corresponding pinion will be actuated one step. If, however, the element 70 of the lowest order in the highest set, Figure 8, were in the same position as the element 70 of lowest order in the first set shown in Figure 9, the pinion 63 would be locked against rotation and thus Itie up the register.

It is desirable to prevent overthrow of the pinion 63 associated with the element 70 having a cutout 99. To this end, provision is made of a pawl ed on a rod 101 supported at its ends in the end plates 102 of the register, and held against movement along said rod by collars 103 on opposite sides thereof. The pawl 100 has a tooth 104 at its forward end to engage between the teeth on the pinion 63, and a laterally-proj ecting tooth 105 at its rear end to co-operate with the dwell 98 on the corresponding member 70, the cutout 99 being of such length that, when the shaft 71 is turned from its normal position, shown in Figure 7, to bring the spur 96 thereon into engagement with the teeth of the pinion 63, the pawl 100 will ride off the end of the dwell-portion 98, thereby releasing the pinion 63. As soon as the spur 96 passes the tooth 105, the latter will again be engaged by the dwell-portion 98 and the pawl shifted into effective osition. The inclined forward face 106 o the pawl 100 obviates any interference by the pawl 100 with the movement of the spur 96.l

The spurs 96 and the carry-over-completing elements 70 of each set are spaced about 27 degrees apart around the shaft 71, so that the eleven spurs 96 of the first set of elements will extend through 297 degrees around the shaft 71. It will be seen that, if the helically-arranged spurs 96 were continued in this order around the shaft 71, the 13th spur l the highest spur ofthe first set and the low'- est spur of theA second' set, thus providing, in connection with the cutout 99 in the first 100, pivotally mountmeagre element 70 of the second set, for carryingover from the rst set to the second set. Ample time will thus be given for such carryover before the second set of elements 70 of the carryover-completing means is brought into operation. i

From the foregoing it will be understood that the register comprises an extraordinary number of dial-wheels arranged in denominational order; that there is provided a series of computing bars, one for each dialwheel, said computing bars being divided into two groups; that for a pin-set machine of this character'there is associated with the computing bars indexing mechanism to set up a number thereon; that the denominationselecting mechanism is divided into two groups, the first group of lower order and the second group of highergorder, each group comprising a set of transposition-devices; that there are providedtwo sets of jacks, one set for each set of transposition-devices; that there are provided two selectors on said carria e, one for each set of jacks to actuate sai jacks; and that said selectors are arranged so that the jacks of the second group of denomination-selecting mechanism are ac-' 'tuated, first by one of the selectors, and that the ,other selector becomes subsequently effectlve to actuate the jacksl of the first group of denomination-selecting mechanism to actuate the computing bars so as to setup on the computing bars a number comprising an extraordinary number of digits. It will frther be understood that the register comprises a carry-over device having a plurality of carry-over elements arranged in more than one coil of a helix; and that the general operator drives the dial-wheels on its forward stroke and actuates on its return stroke the carry-over device through suitv able means to rotate said carry-over device through more than one revolution to el'ect all of the .carry-overs of the extraordinary number of dial-wheels from the lowest to the highest denominational order.

Variations may lie-resorted to within the scope of the invention, and portions of the improvements may be used without others.

.Having thus described my invention, l claim:

1. In a computing machine, a series of denominational dials, a series of carry-over elements, each settable by a dial for actuating the dial of thenextfhigher denomination, and

a rotatable carry-over-completing device effective on said elements in successive rotations to effect carryovers between successive groups of dials.

2. In a computing machine, a series of denominational dials, a series of carry-over elements, each settable by a dial for actuating the dial ofthe next higher denomination, an a rotatable carry-over-completing device eff fective on said elements in successive rotations to el'ect` carryovers between successive groups of dials, and comprising carry-overcompleting members having actuating spurs arranged in a plurality of helical coils.

3. In a computing machine, a series of denominational dials, a series of carry-over elements, each settable by a dial for actuating the dial of the next higher denomination, and a rotatable carry-over-complet-ing device effective on said elements in successive rotations to effect carryovers between successive groups of dials, and comprising carry-over-completing members having actuating spurs arranged in a plurality of helical coils and aligned stops associated with all of said s urs, except the first in the second helical coil, or preventing overthrow of said elements by said dials, the one overthrow stop being omitted to permit a carryover from the dial associated with the last spur of the first helical coil to the dial associated with the first spur of the second helical coil. A

4. ln a computing machine, a series of denominational dials, a series' of 4carry-over elements, each settable bya dial for actuating the dial of the next higher denomination, and a -rotatable carry-over-completing device effective on said elements in successive rotations to effect carryovers between successive groups of dials, and comprising carry-over-completing disks having operating spurs arranged in helical coils, aligned overthrow stops for all but the one having the first spur in the second helical coil, and dwell surfaces extending from the spurs to the stops to enga e said carry-over elements after actuation y the vspurs and lock them until said overthrow stops are brought to their normal positions. 5. ln a computing machine, a series of denominational dials, a series of carry-over elements, each settable by a dial for actuatin the dial of the next higher denomination, and a rotatable carry-over-completing device effective on said elements in successive rotations to effect carryovers between successive groups of dials, and comprising carry-over-completing disks having operating spurs arranged in helical coils, aligned overthrow stops for all but the one having the lirst spur in the second helical coil, dwell surfaces extending from 1 the spurs to the stops toengage said carryover elements after actuation by the spurs and lock them until said overthrow stops are brought -to their normalpositions, and an overthrow pawl to engage the carry-over element associated with the disk on which the stop is lacking.

6. ln a computing machine, a series of denominational dials, a series of carry-over elements, each settable b a dial for actuating the dial of the next h1gher denomination, and a rotatable carry-over-completing device edective on said elements in successive rotations to eliect carryovers between successive groups of dials, and-.comprising carry-overin the second helical coil, dwell surfaces extending from the spurs to the stops to engage said carry-over elements after actuation by the spurs and lock them until said overthrow stops are brought to their normal positions, and an overthrow pawl to engage the carryover element associated with the disk on which the `lstop is lackin the last-mentioned disk having a circular well portion to engage the pawl and lock it in effective position until the disk is rotated to the position in which actuation of the carr -over element may be eiiected by the dial o next lower denomination.

7. In a computing machine, the combina- A tion with dials, each yhaving a carry-over l pinion but with every tooth,

a member for effecting a carry-over from one of said dials to the dial Aof next higher denomination, comprising a pinion having teeth corresponding to a nine-toothed third tooth omitted, said carry-over member being advanced one step bythe carry-over tooth of the dial of next lower denomination when the dial passes from 9 to 0; means to lock the carryovei` member against overthrow by the next lower dial, comprising a pawl having a tooth projecting into one of the wide gaps on the periphery of the pinion; and a carryovercompleting disk having a spur to engage a 35' tooth of the pinion after the pinion has been advanced'one step by the next lower dial, and advance the pinion suiciently to complete the carry-over, said disk having a circular dwell at its periphery to engage in one of the wide gaps in the pinion to lock the same to prevent overthrow after the spur has acted on the pinion, and serving also to engage one end of the pawl to lock it in engagement with the pinion; the disk being cut away so that when the spur is moved into engagement with the pinion the pawl will bereleased. A

. 8. In a machine of the class described, a rotary device comprising a plurality of carry-over-completing spurs arranged in successive coils of a helix.

9. In a machine of the class described, a rotary device comprising a plurality 'of carry-over-completin spurs arranged in successive coils of a he ix, a series of locking dwells associated with said spurs, respectively, andan overthrow-preventing device controlled by each locking dwell associated with the first s` ur in a helical coil of higher order than the rst. 4

10. In a machine of the class described, a rotary device comprising a plurality of carry-over-completing spurs arranged in successive coils of a helix, the angular interval betweenthe last spur of one coil and the first spur of the next coil-being greater ,rotary device than the uniform intervals between `successive spurs in any of the coils, to enable a carry-over to be effected from the dial of hi hest order of one set to the dial of lowest ortgier of the next set before effecting the next carry-over action on the second set.

11. In a machine of the class described, a rotary device comprising a.` plurality of carry-over-completing spurs arranged in successive coils of a helix, a series of locking dwells associated with said spurs, respectively, a series of overthrow-stops associatedk with said spurs except the first s ur in each helical coil of higher order than t e first, and an overthrow-stop-device controlled by said to be effective and ineffective in accordance with the rotary position of the last-mentioned spur.

12. In a machine of the class described, a rotary device comprising a plurality of carry-over-completing spurs arranged in successive coils of a helix, and a series of locking dwells associated with said spurs, respectively; the angular in erval between the last spur of one coil any, the first spur of the next coil being greater than the uniform intervals between successive spurs in any of the coils, to enable a carry-over to be effected from the dial of highest order of one set to the dial of lowest order of the next set before effecting the next carry-over action on the second set.

13. In a machine of the. class described, a register comprising a plurality of dials, a carry-over member settable by one of said dials to effect a carry-over to the dial of next higher denomination, a c'arry-over-complet-V ing member to complete the carry-over movement of said carry-over member, and a pawl controlled by said carry-over-completing member to prevent overthrow of the carryover member by the dial of next lower ldenomination. v

14. In a machine of the class described, a register comprising a plurality of dials, a rotatable carry-over member settable by one of said dials to eiect a carry-over to the dial of next higher denomination, a rotatable carryover-completing member to complete the carry-over movement of said carry-over mem-l ber and to lock it a ainst overthrow, and

means controlled by said carry-over-completing member for preventing overthrow of the carry-over member by the dial of next lower denomination, the overthrow preventing means being maintained in effective position until the carry-over-completing member is advanced to a position to actuate the carryover member.

15. In a computing machine, the combination of a series of carry-over pinions, two sets, of carry-over completing sectors arranged in successive coils of a helix, locking dwells associated with said sectors, and overthrow-prevent-iondevices associated with all of said dwells, `the overthrow-prevention devices of all of said dwells except the one of lowest order in the second set being formed on said dwells, the overthrow-prevention device associated with said dwell of lowest order being separately supported and controlled by its associated dwell.

F16. In a computing machine, the combination of two adjacent dial-wheels arranged in denominational order, a carry-over pinion settabl by the dial-wheel of lower denomina- .tional"\order, a revoluble element to actuate f said pinion after it has been set to revolve the dial-wheel of higher order through one digit position, and means comprising a pivoted element to be engaged by said revoluble element to prevent possible overthrow of the carry-- over pinion when said pinion is actuated by the dial-wheel. l

. '17. In a computing machine, the combination of two `adjacent dial-wheels arranged in denominational order, a carry-over pinion settable by the dial-wheel of lower denominational order, a revoluble element comprising a shaft and a sector on said shaft to engage said pinion, after it has been set, and further actuate it to revolve the dial-wheel of higher order through one digit position, a disk on said shaft, and means comprising a pivoted element to be engaged by said disk to prevent overthrow of the carry-over pinion when said pinion is actuated by the dial-wheel.

18. In a computing machine, the combination of two adjacent dial-wheels arranged in denominational order, a carry-over pinion settable by the dial-wheel of lower denominational order, a revoluble element compris- Vdisk on said vand a dwellon its periphery, and means coining a shafta^nd ay sector on said shaft to engage said pinion, after' it has been set, and further actuate it to revolve the dial-wheel of higher order through one digit position, a shaft, said disk having a cutout prising a4 pivoted element engaging said dwell to prevent overthrow 'of the carry-over 'y pinion when said pinion is actuated by a dialwheel, said pivoted element being capable of engaging in the cutout of said disk to render said pivoted'eleinent inedeotive, so that the carry-over pinion may be rotated freely by said sector.

19. ln a register for a machine of the class described, the combination of a rotary device comprising two groiips of carry-over completing elements, said groups arranged in successive coils of a helix, the first group containing the overthrow completin elements of llower denominational order, t e second group containing those of higher denominational order, overthrow-prevention devices associate'dmith 'all of the carry-over completing elements except the one associated with the element of lowest order in the second group, said carry-over completing elements being connected to said overthrow-prevention f puting machine of the devices, and a separate overthrow-prevention device associated withsaid element of lowest order, the last-named overthrow-prevention device being individually supported and controlled by said lowest order element.

20. In a computing machine, the combina-- tion bf carry-over pinions, a shaft, a plurality of carry-over completing disks to co-operate with said pinions, said disks comprising two groups on said shaft, the first group containing carry-over completingdisks of lower denominational order, the second group containing those of higher denominational order, said disks having teeth thereonarranged'in successive coils of a helix, all of the carry-over'completing disks except the one of lowest'order of the second set having an overthrow-prevention stop thereon, said stops to co-operate with the carry-over pinions, and a separate support for the overthrow-prevention stop associated with said lowest order disk.

21. ln a combined twpewriting and computing machine of the character described, the combination of a register including a great multiplicity of dial-wheels, a carry-over devicecomprising a plurality of carry-over elements arranged in more than one coil of a helix, a series of dial-driving elements, indexing devices on said dial-driving elements, mechanism to enable a number to be set up on said dial-driving elements by said indexing devices, a general operator to actnate the dial-driving elements after the number has been set up, and means actuated by thel general operator to subsequently revolve said carry-over' device through more than one revolution to effect all of the carry-overs for the dial-wheels from lowest to highest denominational order..

22. ln a combined typewriting and comclass described, having a register that includes a great multiplicity of dials, denominational devices havin index-*devices in which digits may be in eXed and a general operator to run numbers so indcxed into the register, a set of intermediate carry-over devices, said set of intermediate carry-over devices forming a helical row of a plurality of convolutions, each carry-over device settable by a dial to actuate the next higer dial, a multif lle-revolution rotary carryover-completing e'vioe, nection between the carry-over-completing device and said general operator to operate the carry-over-completing device during a and a one-way con-` ico lil() movement of the general operator, to comwheels,

HENRY la PITMAN.

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