US1187718A - Combined type-writing and computing machine. - Google Patents

Description

G. 0. DEGENEII.

COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED DEC. 13, I910.

Patented June 20, 1916.

2 SHEETS- SHEET I- n" 5 runs nc mm. msnmnm b a s. 0. DEGENER.

COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION HLED' mac. 13. mo.

Patented June 20, 1916.

2 SHEETS-SHEET 2-.

ms Panama, LvmmWAsm-m'mj UNITED STATES, PATENT OFFICE.

GUSTAVE O. DEGENER, OF NEW YORK,-N. Y., ASSIGNOR T UNDERWOOD COMPUTING MACHINE ooMraNY, or NEW roan,- N. Y.,

2"}; all tvho m e't may concern Be it known that I, GUSTAVE O. DEoENeR, "a citizen of the UnitedStates, reslding in tiqn. J p I This'; invention relates to computing machines, and particularly to combined type "writing and computing machines of the kmd set forth in application No. 5(l3, 64=3,'filed February 12, 1910, in which, upon depress a typewriter key to .writea number, the

adding orcomputing mechanism is auto- .fjmatically operated to add or compute the number that is written .on the work sheet."- .Anelectricmotor supplies the power to turn the computing wheels, and the motor operates through'a friction or other clutch, to permitjthe' motor to run constantly.' An

'esc'apement'lor' indexing mechanism is employed' in connection with. the numeral keys 25,:of 'tl1e.typew-riter,'todetermine, in each 1nfstance', how far' the computing wheels shall be turned by the motor.

' ';;According to the present invention, ink i s te'adiof having the motor circuit constantly lis n'ormally still, and each numeral key of I it is normally open, and the motor I .the typewriter has means to close said circuit and start the motor into action to sup- "ply theflpower for turning the computing wheels.

' One of the principal advantages of this [construction is that the machme 1s less no1sy, as the. motor and the gearing are stationary I1; when the-'keysare not being manipulated.

This improvement is of additional imporfiance 'Where a .special rapidlyrevolving -power-sliaft is employed vfor assisting at the tens-carrying operation, since said assisting i shaft is connectedby a train of gearing to "the'motor, and by bringing the parts to rest,

the noise ceases when the keys are not being operated. The cost of running the motor is materially reduced, as it is only in operation When'the computing is being actually done.

In the preferred form of the presentinvention, at thedown stroke of any numeral key'the motor circuit iscompleted, and the motor starts to turn. No motion of the com -puting wheels however occurs at this downward key stroke, assuch motion is not perkey. In one form of the nections are such that the paper carriage of. the typewriter controls the let-ofi oi the Spring 8.

A CORPORATION OFNEW YORK.

COMBINED TYPE-WRITING AND ooluru'rrlve MACHINE.

Specification of Letters Patent. Pat t d June 20, 191 Application filed December 13, 1910. Serial No. 597,121. I

'mitted by the escapement mechanism until the upstroke of the key, so that the motor has opportunity to gain down-stroke and part of the up-stroke of the invention, the convariable-escapement mechanism of the computing machine, so that said carriage must move at each letter-spacing operation, in order to allow the computing wheels to be turned by the" v v, this time, has gainedthe necessary speed. Preferably thebreaking final portion of the to insure acontinucomputing operation is completed. Other features and advantages will hereinafter appear.-

speed during the" motor, which by,

of the'motor circuit is causedbythe motor-driven computing In .the accompanying drawings, Figure'l V is a'part sectional side elevation of the present improvements applied to a combined typewriting and adding machine such as shown in said application, and known as the Underwood computing machine; the parts including a motor, being in normal positions of rest. F ig'. '2 is a sectional eleva tion of the computing mechanism, showing particularly the mechanismfor assisting at the tens-carrying operation. Fig. 3 is a perspective rear view, showing the connectionbetween the numeral keys of the typewriter and the computing mechanism. Fig.

. 4 is a view to be read in connection with Fig.

3, showing the means for enabling thepaper carriage or its escapement mechanismfto effect the operation of the computing mechanism. Fig. 5 is asectional diagrammatic view to show the'closed switch of-the motor circuit.

The typewriter includes letter keys '1 and numeral keys 2, all the keys mo'unt ed on levers 3, connected by sub-levers at to type-bars 5, to throw the latter back against a 7 driven by'a spring barrel 8 and having arack 9 engaging a pinion 10 connected to anescapement wheel 11. Each type bar has a heel 12 to push back a universal bar 13, which is connectedto dogs 14:, 15, Working in and out' of the escapement wheel 11, to permit the step-by-step feed of the paper carriage under the tehpion of platen 6 mounted on a carriage.

5 link 18, thereby vibrating a lever .19, to

which is pivoted a jack 20, that pushes one of a set of escapement pinsvor index pms 21 through a primary variable-escapement wheel or index. pin wheel 22, so that the pin projects from the other side of the wheel said wheel being power-driven in a manner presently to be described, and the projected pins engaging one after another, with a four-toothed pinion 23, which 1s 5 Aixed" to a shaft 24, the latter carrying a four-toothed secondary escapement wheel 25, which is let off intermittently by reciprocating escapeinent dogs 26, 27.

The initial movement of the escapement dogs 26, 27 is effected by the down-stroke of the key2; each lever 19 (of which there are nine, grouped in a-circle concentric with wheel 22) adapted to bear against a universal plate or member 28, fixed upon a rod 29, said rod havingat one end a collar 30,

and the lever 31 having a head 32 between said collar and plate 28, so that any lever 19 is enabled to vibrate the lever 31. This lever 31 is connected by a horizontal link 33 with an arm 34 fixed upon a rock shaft 35, upon which are also fixed the dogs 26, 27.

The initial movement of the arm 34 is to the left at Fig. 3; and upon completion of said movement, a latch 36 is pushed by a plate 39 fixed to said rock shaft 35, said plate having a curved edge 40 concentric with said shaft, against which said latch presses idly during nearly all of the initial stroke of arm 34. The arms 34, dogs 26,27, and the shaft 35 are all locked by said latch against return (under the influence of a spring 41). Said spring 37 is connected to a link 42. The latter connects the latch 36 with a lever 43, fulcrumed at 44 on a fixed part of the machine. To the upper end.of the lever is connected a link 45, which is pivoted to a pin 46 projecting from a'pallet 47. The described locking movement ,of the latch 36 under the influence of the spring 37, is accompanied by a vibration of the lever 43, and a movement of the pallet 47 (in its fixed guide 48) into contact with the next tooth 49 of the escapement Wheel 11 of the powerdriven paper carriage 7. There also occurs duringthe downward movement of the said key 2, a vibration to the left at Fig. 3, of an upstanding arm 50, also fixed upon said rock shaft 35, and engaging a. pin 51 projecting from a bar or slide 52, which is supported in a fixed' cylindrical guide 53 (Fig. 5). Upon this slide 52 is a shoulder 54, which vibrates or closes an electrical spring-switch or contact 55,. fixed a screw 56 upon an insulating spring 37 into a notch 38 provided upon a by said shoulder 54. This switch or ccn-- tact 55 is thereby moved into engagement with a contact 59, secured by a screw 60 to said block 57 and preferably yielding Wires 61 and 62 lead from 55 and 59 to motor 63. Upon the shaft of this motor 63 may 'be mounted a friction clutch member comprising three shoes 64to engage a. friction ring 65, to which is fixed a bevel pinion 66, meshing with a bevel pinion 67, the latter upon a shaft 68, which also carries a bevel pinion 69 meshing with a bevel pinion 70. To the latter is fixed a pinion 71, meshing with a pinion 72 fixed upon a "wheel, as well, as to run idly temporarily when said escapement wheel is held against rotation by the pinion 23, shaft 24, wheel 25 and dogs 26, 27. 4 I

The bar 52, which closes the motor circuit, is temporarily locked in effective position by -a latch 74, actuated by a spring 75; said latch entering a notch 76 in said bar to lock it. The latch is mounted upon a horizontal rock shaft 77. No motion of the computing mechanism occurs at this time, but the motor begins to turn and to gain speed.

Upon relief of the key 2 from pressure, the type bar returns to normal position, the carriage-feeding dogs 14 and 15 also return to normal position, together with the univer sal bar 13, which permits the paper carriag 7 to be advanced one space under the influ ence of spring 8; the escapement wheel 11 turning to the extent of one tooth. The pallet 47 is pressed to the left at .Fig. 4 by the tooth 49 of the advancing escapementdescribed) until the next tooth of wheel 25- engagesdog 26; at which time the pinion 23 is engaged by the pin 21 that has just been projected by a key 2, as above described; the

pinwhich escapes from pinion 23 being returned endwise by a fixed wiper or cam 21", Fig. 3. The bar 52 does, not at this time return to normal position, because it is held locked by the latch 74. The loose engagement or connection of arm 50 at 51 permits the return movement of the rock shaft 35 and arm 50, while the switch-closing bar or slide 52 remains stationary in effective position.

Initially, the tooth of secondary escape ,motor until it is again arrested and locked stroke of the dogs, said tooth is ,i'eleased from dog 27, therbby' liberating the wheel 25, pinion 2 3 and escapement wheel 22, which turns as aforesaid. .The last projected pin contacts \with the pinion 23, as just explained,

and causesv the succeeding tooth wheel; 25. to engage the dog 26, thereby again arrest-- ing the primaryescapement wheel 22."

During the final portion of the advance movement of the tooth ofisecondary escapement wheel 25, after leaving thedog" 27,

said arm engages a .trip or releaser 7 8, projecting from the rock shaft 77, and swings the latch 7 4 out of the notch 7 6, thus permitting the switch-closer 52 to be returned to the right at Fig. 3, to normal position,

under the influenceof the spring. 7 9; thus permitting the switch or contact to sep-- arate from the contact 59,-'an(l break the .shaftlO whic'h',-at its outer end, carries a 'motor' circuit; this occurring, of icourse, at the completion of the computing operation, so that it is assured that power shall be availablefthroughout the entire computing operation. The motor may then run idly and cometo rest; Backward movement of the; escapement wheel 22' may be prevented pinion 115 upona shaft 116. Said shaft 116 by: any suitable back check, as a pawl 80, provided .with a spring 81. This pawl locks the index-.wheel-122 against rotation, in one direction, while the pinion 23 cooperates with the-last set pin 21 to'lock the wheel against rotation in the. opposite 'dire'ction..'

At the operation of any key, said last set pin is withdrawn. and hence the index wheel isreleased and may be advanced by the at the point determined by the key oper- The connection betweenthe 'capement wheel 22 andrthe remainder of the computing me hanism, comprises the-pinion 72', the pinion 1, the bevel pinion '70, a v inion 82 in: mesh ,with-the latter and xed upon'a horizontal shaft 83, a bevel pinion 84 fixed upon shaft 83 and meshing with a bevellpinion 85 upon a verticalshaft-SG the-latter carrying. at its upper end a beve pinion 87.meshing with-Ya bevel.pin ion'88,

which is mounted upona shaft 89',."wh ich carries a master wheel 90, the latter havln with internal gears 92, 'formed upoin corn:

puting -whe el s" 93 the latter having also a Q ream,

'1 1,0: h typ t i j, 10:"; an:

' "whileithe aster 11111129190 does not mote-in .asialjdirectionq supp a. d; "oonnectedby a bar QStQt QT" is turned (by the tooth 99 as aforesaid) into engagement with a soft-rubber roll 103, which is positively rotated by the motor 63 in a manner presently to be; explained. This soft rubber roll 103 turns'the. wheel'102, to

assist at or to complete the tens-carrying operation; and a detent 104, having a spring 105 and a. roll 106, may finally complete'the rotation of the me hers 100, 101, 102, and

then hold them ainst accidental displacement; the roll 103 turning idlybetween adjacent lobes of wheel 102, 'wl,.n no tens- 35 carrying operation is being done,'and'wlien t1 e motor. is running. a

The te s carryin'g roll 103 is fixedupon a bevel pinion.108-; meshing with a bevel pin- 90 ion 1 09 ona vertical shaft thelatter ca'rrying at its lower end a bevel pinion 11 1, meshing with a bevel pinion 112 secured upon a horizontal shaft 113, which also carries abevel pinion 114 meshing witha bevel 9.5

also carries a pinionll'Z', to mesh with an idle pinion 118, the latter-meshing with a pinion 119.fixed upon the-motor shaft. I The soft rubber roll 103 only 'runs w'hen the InQ- 10o tor is running, and then runs long enough at each operation to assure the'com-pletion of the t'ens carrying. operation. It may-even run a while after the index-wheel 22 has I stopped, since-the motor 63 may continue, 105

tdrevolve idly by "momentum after said wheel 22 stops; said motonbeingcapable of rotating inde endently of'saidwheel22both before and a ter the. rotatio'n'of the latter.

When the machine-is operated rapidly, 116 the motor, in practice, may never-*stopi but upon cessation. of operation of the machine, the motor comes to rest, and'the'objectionable nbiseof' the gearing ceases, and a reduction inicost in runningthemot'or is H5 effected. It will be seen that any of the numeral keys 2 of'the typewriter throws the :motor into action :to turn] any computing wheel to an extent determined by the-"key v itself, "The release of said key will cause the motor eventually to stop. v I 1 The" contactor'switch' arm 5'5 isprefen abl made of vrythinspringy'knetal, whichv egged the shoulder, 54.- froin its 'nomial gpenrpositio'n to the closed osition 'cuit, means toenab1e the letter-feeding sh rings awayifro nythe ontact anldmthe liability f objectionable sparking is nearly or practicallyeliminated. The arms 55 and sa e so formed thatiwhen 59 is flexed by the pressurehof thereon, there is'a slight endwis e rubbing of 59 upon55, due to the different paths in which the, twotips move. This rubbing keeps the surfaces cleaii,'as is desirable in electrical contacts.

Variations may be resorted to within the scope of the invention-,and portions of the improvements may be used without others. Having thusdescribed ,my invention, 1 claim: "1. Inacomputing mechanism, the combination with a set of independently operablenumeralj keys, of a set of computing devices, an electrical" motor for operating said coinputing'devices, means controlled by thekeys' for variably limiting the extent of movement Oftll computing devices, a normally open .circuit for said motor, means for enabling each of said keys to close said circuit, and means dependent upon the oper- Jationjof the computing devices for opening the motor circuit. a

2. In a-typewriting and computing mechanism, the combination with a set of numeral. keys, of a computing device, means controlled by the keys for variably limiting the extentof movement of the computing device, an electrical motor for operating said computing device, a normally open circuit for saidmotor, means for enabling each key at the down stroke thereof to close said circuit, means dependent upon the up stroke of, the key. for enabling said'inotor to operate said computing device, and means dependent upon the operation of the computing device for/opening the -motor circuit.

3. In 'a typewriting and computing mechanism, the combination with a. set of nu- 'meral-keys, of a set of computing devices,-

means controlled by thekeys for variably limiting the extent of movement of the computingdevices an electrical motor for op- ,eratingsaid computing devices, a'noinially openc rcuit for said motor, means for enabling each key at the down strokethe'reof to close saidcircuit, and means dependent upon the up stroke of the key for enabling said motor. to operate said computing devices, and for opening the motor circuit.

4:. 'In a typewriting and computing mechanism, the combination with a typewriter carriage, a set of nunieral keys, and letterffeeding devices controlled by said keys for said typewriter carriage, of a computing device, an electrical motor for operating said computing device, means controlled by the keys for. variably limiting the extent of movement of the computing device, a noru really open circuit for said motor, means for enabling each of said keys to close said cirmovements of the carriage to control the motor, and means to enable the computing device to "Open said motor circuit.

5. in a typewriting and computing mechanism, the combination with a typewriter carriage, a set of 'nu'meral keys, and letterfeeding devices controlled by said keys for open circuit for said motor, a reciprocating escapement device for controlling the computing device, means to enable each of. said keys to move said escapement device in one direction to close said circuit, a spring to return said escapenient device, a latch to hold said escapenient device against return,

means dependent upon the movement of the carriage to release said latch,'-an'd-.nieans dependent upon the movement of the computing device for opening said motor circuit.

6, In a typewriting and computing mechanism, the combination with a typewriter carriage, a set of numeral keys,.and letterfeeding devices controlled by said keys for said typewriter carriage, of a computing device, means controlled by said keys for determining. the eivtent of movem cnt of the computing device, an electrical motor for operating said computing device, a normally open circuit for said motor, a universal mcmber operable by any of said keys a reciprocating escapement device 'for controlling the computing devicefincans to enable said universal member to move said escapement device in one direction and to closesaid circuit, a" spring to return said escapcment device, a latch to hold said escapement device against return, means dependent upon the movement of the carriage to release-said latch,

and means dependent upon the movement of the computing device for opening said motor circuit.

7. In a computing mechanism, the combination with a set of numeral keys, of a computing device, an electrical motor for operating said computing device, a 'univciaal member operable by any of said keys,'means controlled by the keys for variably limiting the extent of movement of the computing device, a normally open circuit for said motor, means fdF- efla-bling said universal member to close said circuit and permit the motor to operate the computing device, a late tohold said circuit closing means in effective position, and means dependent upon the movement of the computing mechanism for re leasing said latch.

8. Ina typewriting and computing mechanism, the combination with a typewriter carriage, a set of numeral keys and letterfeeding devices controlledby said keys for operation of the computing device by said .sal 'memberto 'in one direction, a spring to return said es- 'ca'pem nt device, a latch to hold said esmid'bp writer carria-ge,-Qf a compu vice, means controlled by said keys for detel-mining the extent, of movement ofthe computing device, and an electrical motor for o rating said computing device, a circuit orisaid motor, .said circuit having, a

normally open switch, reciprocating esto move said. escapement device in one directiomfa spring to return said escapemcnt xdevice a latch-to hold said escapement dethereof, switch-closer in effective position, 'for returning said second latch, pendent upon the movement of the carria e vice-against return, a s\vitch-closer;movable of said keys during the. depression a second latch for holding said a spring means dea by a . 1 tofrelease the first latch, and means depen device for releasing'the'second i In a typewriting and computing mech-- ent upon the movement of the computing latch.

"-anisin, the combinati'on with a typewriter carriage, 'feed' said ice, means controlled by said keys for dea set of numeral keys, and letter-' n'g devices controlled by typewriter carriage, of a computing determinin'g the; extent of movement'of the said keys for computing device,- an] electrical motor for operating said computing device. a circuit for fs'aid motor, said circuit having a normally open switch, a universal member op ;.--era le 'b'y' any-of-.said'keys, a reciprocating .escapement device .for controlling the computing device, means to enable said univermove said escapelnent device capement device against return, a switch-v second latch for :;..oser movable by'said universal member, a

said second latc means dependent upon the movement of the carriage to release the latch,

- movement ofthecomputing device for releasing the secOndlatch.

f puting machine,

sov letter space 'feed, o fv a master wheel travel- "10. In acombin'ed the combination with numetal keys and a travelingcarriage with a v ing step by step with said carriage,. an elecric motor for wheel, a said m'og 11. In a'computing machine, the combination; with numeral keys and computing wheels,

' toan extent determined by lkeys, a'circuit for driving said motor, a

of a motor for driving-said wheels the numeral switch in said circuit comprising two terminals" normally spaced from each other, a

holding said switch-closer" ineffective position, a spring for returning and means dependent upon thethe escape typewriting and com- I trolled device for positively plunger for moving one ofv said terminals a spring normally drawa'gainst the other, ,mg sa1d plunger clear of sa1d terminal, a

".latch'normally tending to engage said plunger tohold it effective against its terminal,

and means for positively releasing said latch at the completion of a' computation, .12. In a computing machine, the combination {with numeral keys and computing -wheels,.iof a motorfor turning said wheels,

a circuitfor driving-said'motor, a switch in spaced, a plunger moved by the operation of a key tomove one terminal against the other, a latch tending to hold said plunger effective, an escapement wheel comprising 'settfable teeth,- means for moving said pluna ger by the operation of a numeral key to bring one of said terminals against the other, a latch holding fective, and means set for positively'releasing said la'tch.

I In a computing machine, the combination I wheels, of a master wheel adapted to turn said computing wheels s'criat-im to an extent determined by said keys, a motor for turning said master .,\v'l1eel, an: electric circuit for drivingsaid'motor, means operated by the depression-of any numeral key for positively closing said circuit,

moved by the operation far said motorsha'll turn 's'aid com-.

and means for releasing Said 1 said plunger so efoperated by the tooth so with numeral keys and computing and means operated by-v in said circuit having its terminals normallg the completion of the turning of. a computing wheel for positively opening said circuit.

15. In a computing machine, the combination with numeral keys and computing Wheels, of a master wheel for computing wheels serz'atim, a ated by said numeral keys for how far said master wheel shall depression -of each numeral key, turning said master wheel, means, operated by the depression of a numeral key for positurning said device operturn at the determining a motor for .tively closing a circuit for starting said mo.-

tor, and means operated by said key-conopening said circuit when said master wheel has completed its turningL 16.-In a computing machine, an electric contact held closed them, and'a wheel governing one of said latches.

two latches,

17. A computing-machine comprising a 0 18. In acmnputing driving wheel and an index pin which is- "displaced on said driving -wheel, a stop for arresting said wheel by said pin, a latch which holdsia circuit closed, means "torreleasing said latch by said pin, and a motor the computing wheels, a norinally'open cir-' ciiit for said motor, means for closing said circuit by the operation ot a numeral key, and means dependent upon the movement of said member effected by the motor for opening said circuit.

1!). In a combined typewritingand computing machine, the combination with numeral keys and computing wheels, of a traveling carriage, an electric motor, an electri -al circuit including said motor, an escapement wheel normally held against rotation, a latch for holding said circuit closed, and means for positively releasing said latch" by the arrest of said escapement wheel; means being provided to connect the motor to the computing wheels to turn them, but the motor being also capable of rotation independently of the wheels.

20. In a computing mechanism, the combination with aset of independently operable numerals} keys, of a set of computing devices, an electrical motor, means controlled by the keys for variably limiting the extent of movement of the computing devices, a normally open circuit for said motor, and means for enabling each of said keys to close said circuit; means being provided to connect themotor to the computing devices to operate them, but the motor being also capable of rotation independently of the devvices: a

21. In a" computing machine, the combination with numeral keys and computing de- VlCeS,"0f an electric motor, a normally open circuit for driving said motor, means oper ated by the depression of said keys to close said circuit and to hold it closed until the movement of each computing device is complete,'means normally preventing the computing devices from' being driven by the motor, and means dependent upon the up stroke of said keys, for permitting the motor to drive the computing devices.

ZZQIn a combined tvpewriting and computing machine, the COIIlblD"i31OI1 with numeral keys and. computing devices, of a traveling carriage, means for carrying min -i bers represented by keys operated into said computing devices,van electric motor adapted to drive said means, a normally open circuit for driving said motor, means closing said circuit by the operation ofysaid keys, means dependent upon the iiotoij-adriven means, for holding said circuit closed and means releasable by the letter-feeding movement of said carriage for restraining the motor-driven means from operation.

23. In a combined typewriting and computing machine, the combination with numeral keys and computing devices, of atraveling carriage, means; connected with the carriage for carrying numbers represented by keys operated into said computing devices,an electric motor -to.dri ve said number-carrying means, a normally open circuit "for driving said motor, means for closing said circuit by the depression of one of said keys, a latch holding said circuit closed. means dependent upon the release of said key for permitting said number-carrying means to be driven by said motor, and means for releasing said la'tch atthe conclusion of the operation of said, numbcr-ca -ying means.

24. ,In a computing mechanism. the co mbination with a set of numeral .keys of a computing device, an electrical motor for operating said computing device, a universal member operable by any of said keys, means controlled by the keys for, variably limiting the extent of movement of the computing device, a normally open circuit for said 1notor, mcans controlled by said universal member for closing said circuit and positivelyholding it closed long enough to permit the motor to operate the computing device, and means operated by the driving of the motor for automatically opening said circuit. 1

25. In a computing machine, thegconib'ination with computing wheels and numeral keys, of .a rotating electric :motor for carry,- ing into said wheels numbers represented by the keys struck, a normally open circuit driving said motor, and means closing said circuit on the depression of a numeralkey' arranged to opensaid circuit when the' key 18 released, said motor having such connection to said wheels-as to perm1t;1t to con- .tinue to revolve idly independently of; the" wheels at the conclusion 1 of. the computing operation. 1

26. In a computin nation with numeral machine, the combikeysrand computing wheels, of a motor, means actuablerthereby, -for driving said wheels to an extent deten' mined by the numeral keys, a normally open c rcuit for driving said motor. a switch in said'circuit comprising two terminals normally spaced from each other, a close-roper-v able by any key for moving. one of said terminals against the other, a spring normally drawing said closer clear of; said terminals. a latch for holding said closer against said I wheels are completely turned; the motor be- "terminals, and means dependent upon the operation of the motor for releasing said latch. .27. In a computing mechanism, the combination with computing and numerals keys, said wheels controllable one after another by said keys, of carry-over mechanism, a

.=motor, a shaft normally at rest, and means connected to said motor for causing said shaft to turn a part of said carry-over mech- I anism on each depression of a numeral key said motor being rotatable independently oi:

,,.the computing \vheels,-to,run idly after the completionof the operation of the latter whereby the operation of a succession of carry-over trains maybe completed.

E28.-In a combined typewriting and com-' .-uting machine, the combination with computing wheels and numeral keys, of a master wheel engaging said computing wheels successively', a carry-over mechanism for said computing wheels comprising parts partly a or initially moved with said computing wheels, a motor,v a shaft arranged to be rotated by said" motor to complete said motion of said curry-overmechanism, but normally at rest, and 'power means arranged to rotate said shaft on the depression of each numeral key; means being provided to connect the motor to'the master wheel to turnit, but

the motor being also rotatable independently of the master wheel, to run idly after the completion of the movement of the latter, to complete the motion ofsaidshaft. 29. In a combined typewriting and computing machine, the combination with comsaid computing wheels comprisin'g part's puting wheels and numeral keys, of a master'w'heel to engage said computing wheels successively, a carry-over mechanism for partly or initially moved with said com- I each numeral. key, andholding it closed unputing wheels, a shaft arranged to be rotated to complete said motion of said carry-4 over mechanism, a motor for rotating said shaft and driving said master wheel, a normally open circuit for said motor, and means for closing said circuit on the depression of til the computing wheels are completely turned; said imotorfbeing capable of run' I ning idfy independently of the master wheel at the conclusion of the movement of the I latter, fo completing themovement of said carry-over mechanism.

30. In a computing machine, the combination with an electric motor, of computing wheels, numeral keys, :1 master wheel constantly tending to be rotated by said motor when the latter is active, to turn said computingwheels through distances determined by said numeral keys, a normally open circuit for driving said motor, and means controlled by'the keys forclosing said circuit I and holding it'closed until the computing ing rotatable independently of the master wheel.

31 In a computing mechanism, the combination with a set of. independently operable numeral keys, of aset of computing wheels, an operator-for said'computing wheels, an electric motor for driving said operator, means controlled by the keys for variably limiting the extent of movement of the computing wheels, a normally open circuit for said motor, and automatic means-controlled by the keys for closing said circuit and'holding it closed independently of the keys, until 33. In a computing machine, the combi+ nation with computing. wheelsand numeral keys, of a rotating electric motor for carrying into said wheels numbers represented by the keys struck, a normally open circuit for driving said motor, and numeral-key controlled means for closing and opening the circuit; said motor connected to said wheels by means which permit it to continue to revolve idly independently of the wheels at the conclusion of,a computing operation. 34. In a.computing machine, the combination with computing wheels and numeral keys, of a rotating electric motor, 9, nor-: mally open circuit for driving said motor,

means controlled by the numeral keys for closing said circuit, means also controlled by the numeral keys and efl'ective subsequently to the closing of saidcircuit, for causing the computing wheels to be driven by saidmotor, to carry into said wheelsnumbers represented by the keys struck, said motor being capable of rotation while the computing wheels are at rest; and automatically operating means for openlng sald c1rcu1tat the conclusion of each computation.

35. In a computing mechanism, the combination' with a set of" independentlyoper able numeral keys, of aset of computing devices, a rotating electrical motor, means whereby said motor may be caused to drive said computing devices, said motor being ,also capable of rotation independently of said computing devices, means controlled by the keys for variably limiting the extent of movement of the computing devices, a normally open circuit for said motor, and in ms for enabling each of said keys to close said circuit.

36. In a computing mechanism, the comsaid wheel bination with a key-controlled index-wheel, of means normally locking the wheel against rotation in either direction, an electrical circuit including a motor, to drive said wheel, said circuit normally open, key-controlledmeansfor closing said circuit and releasing said wheel so that it may be driven by sa d motor, and means for opening sald circuit concomitantly with the arrestof the index-wheel. 1

trolledthereby, arotatable motor forv actuating said master wheel, means whereby a currentis connected to drive said motor on thedepression of any numeral key and is later disconnected means to connect the motor to the master wheel to turn it, the motor being also rotatable independently of the master wheel, and a power shaft for driving the carry-over mechanism, connected to be drivenconstantly by the motor while it rotates, whereby a succession of carryovers may be effected. I

38. In a combined typewriting and computing machine, the combination with typeope'rating numeral keys and a gang of computing wheels, of. a letter-feeding carriage, a master wheel adapted to turn said computing wheels scrim ion to an extent determined by the numeral key depressed, carryover devices controlled by said computing wheels,-a normally idle power drive for said carry-over devices, and means for making said power drive efi'ectlve on and after the actuation of any numeral key.

39. In a combined typewriting and computing machine, the combination th typeoperating numeral keys. and computing wheels, of a letter-feeding carriage, a master wheel for turning said computing wheels scriu i'm, carry-overdevices controlled by said computing wheels, an electric motor for driving said carry-over devlces, adapted to rotate idly, and means for connecting a current to drive said motor at the actuation of any numeral key.

40. In a combined typewriting and com-i puting machine, the combination with numeral keys and computing wheels, of a lettor-feeding carriage, a master wheel for turning said computing wheels, carry-over wheels for saidcomputing wheels adapted to be initially turned thereby, a shaft adia-- cent said carry-over wheels adapted to retate continuously but normally idle, a, motor for driving said shaft, and means for connecting a current to drive said motor by the actuation of any numeral key and for automatically disconnecting said current.

41; In a con-ibined'typewriting and com-- puting machine, the combination with numeral keys and comlmting wheels, of a letter-feeding carriage, a master wheel for turning said computing wheels scriuzi'm,

carry-over wheels for said computing wheels adapted to be initially turned thereby, a shaft adapted to complete the turning of said carry-over wheels but normally idle. a motor for driving said shaft. and lllilIlS for connecting a current for driving said shaft by the actuation of any numeral key and for automatically disconnecting said current.

GUSTAVE O. DEGENER.

lVitness-es J. F. LUCAS, J. 1*). DAVIDSON.

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