US1280065A

US1280065A - Combined type-writing and computing-machine.

Info

Publication number: US1280065A
Application number: US79771413A
Authority: US
Inventors: Ogden Minton
Original assignee: UNDERWOOD COMPUTING MACHINE CO
Current assignee: UNDERWOOD COMPUTING MACHINE CO
Priority date: 1913-10-28
Filing date: 1913-10-28
Publication date: 1918-09-24
Anticipated expiration: 1935-09-24

Description

0. MINTON.

COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED OCT. 28, I9I3.

@u H.....H.M..H....H,IH...I..

I IIILII 0. MINTGN.

COMBINED TYPE WRITING AND COMPUTING MACHINE. l

lizzie/tor Patented Sept. 24, 1918.

' 3 SHEETS-SHEET 2.

S ifa/nf APPLICATION FILED OCT- 28, |913. 1,280,065.

0. MINTON. COMBINED TYPEIWRITING AND COMPUTING MACHINE.

APPLICATION FILED OCT. 28, V913- Patented Sept. 24, 1918.

3 SHEETShSHEET 3.

UNITED sTATEs PATENT oEEioE.

OGDEN MINTON, OF BROOKLYN, NEW YORK, ASSIGNOR, BY MESNE ASSIGNMENTS, T0

UNDERWOOI) COMPUTING MACHINE COMPANY, OF NEW YORK, N. Y., A CORLPORA- 4 TION OF NEW YORK.

COMBINED TYPE-WRITING AND COMPUTING MACHINE.

Specication of Letters Patent.

Patented Sept. 24, 1918.

Application filed October 2,8, 1913. Serial No. 797,714.

Computing Machines, of which the following is a specification.

This invention relates to combined typewriting and computing machines and is an improvement ou an application ofl Hans Hanson, iled May 11, 1911, No. (326,550, and an application of John U. Thornton, filed May 2Q, i913, N0. 769,132.

The machine in connection with which this improvement is shown, is of the Underwood-Hanson type in which the number to be computed is first set up in a nest of index pins digit by digit and subsequently transferred to computing wheels, so that all of the digits of the number accumulated are run up at once.

The machine illustrated is capable of subtraction as well as addition` but by the complementary method. where instead of setting the direct values of the pins, the comple- -ments ofthese values are set` and the computing wheels are rotated each a complete revolution less the value ofthe digit written in the corresponding denominational column.

Various safeguards are provided, whereby the machine may not be set to subtraction at inopportune times. One of these safeguards consists in locking means for preventing; the bringing into play of the subtraction-setting mechanism when the general operator, which enables the transfer of an indexed or set-up computation to the computing wheels, is in motion or in any position other than its home position. Another safeguard consists .in preventing the actuation of the subtraction-setting mechanism when a previous computation has been set up without having been transferred to the computing wheels,s0 as to prevent the piling of one set computation upon another.

A further safeguard consists in preventing the actuation of the numeral keysin case a setting of the mechanism for subtraction has been partially elfected but not completely.

Provision is made whereby the running up of a computation after having been made may lbe acomplished automatically at the end of a computing zone, by connecting up the general operator in driven relation with a motor.

Provision is also made whereby the computing mechanism may be set for subtraction automatically just before a subtraction computing Zone or column is reached, so as to relieve the operative of the necessity of adjusting the mechanism for addition and subtraction at the different computing zones' or columns.

lVhen it is desired-to operate the typewriting mechanism without computing, the

computing mechanism may be operatively disconnected from the typewriting mechanism by the actuation of a non-add key. This non-add key may also be connected so as to render ineffective the automatic control which enables the driving of the general operator at the end of a computing zone or column and also the automatic subtraction-setting mechanism which adjusts the computing mechanism, to set complements of the numbers, just before a subtraction zone or column.

Further provision is made whereby the vautomatic motor-connecting mechanism and the automatic subtraction-setting mechanism may be thrown out of action independentlyv and locked out of action without resort to the non-add key and without disconneet-ing the computing mechanism entirely Q from the typewriting mechanism.

Qther features and advantages will hereinafter appear.

Figure l is a diagrammatic section taken` from front to rear with parts omitted for the sake of simplicity, and showing the su-btraction-setting mechanism in its ineffective state.

Fig. Q is an enlarged detail section similar to Fig. l, in which the subtraction-setting mechanism is shown in action and just about to complete its operation with the 9 pin setting bail just released ready to return to its cleared position. This figure also shows the automatic throw-out. mechanism in its ineffective position.

Fig. 3 is a detail view showing the silenc- Y ing means for the automatic motor connecadd key.

tion and the automatic subtraction-setting connection in its permanent effective position so that these parts are incapable of action until released manually.

Fig. 4 is a detail skeleton perspective view showing the connection of the motor-trip: ping and subt-raction-setting-tripping mechanism, and showing the subtraction-setting mechanism in its dormant or ineffective position.

Fig. 5 is a detail view in horizontal section of the manual .key-'whereby the mechanism may be set for subtraction and showing the same in its unactuated position.

Fig. 6 is a view exactly similar to Fig. 5, with the except-ion that the subtraction key has vbeen pressed in and locked in its actuated position.

Fig. 7 is a detail view showing the subtraction bar in full lines in its actuated position and in dotted lines in its unactuated position, with the lock which prevents the bringing into play of the subtraction-setting mechanism when the general operator is in motion or in a position other than its home position, in its effective position in full lines and in its ineffective position in dotted lines.

Fig. 8 is a skeleton perspective view showing the details whereby the computing mechanism is disconnected from the typewriting mechanism and rendered ineffective, together with the means for throwing the automatic motor-connecting mechanism and the automatic subtraction-setting mechanism out of action. In this view the nonadd key is shown to have been actuated and locked in its actuated position, so that the computing mechanism is disconnected from the typewriting mechanism, but lthe automatic motor trip and automatic subtractionsetting mechanism are only temporarily thrown out of action.

Fig. 9 is an enlarged detail view showing the means for unlocking the non-add key and in the act of unlocking the non-add key when the general operator comes into play subsequently to the actuation of the non- Fig, 10 is a detail plan view showin the means for preventing the actuation o? the subtraction-setting bar while the motor and its trip are in action, which-means also prevents the drive of the genera-l operator by .the motor lwhen the subtraction-setting bar is in the act of moving to its subtractionsetting position or when it has been but partially actuated. l

Alphabet keys 1 and numeral keys 2 depress levers 3 to rock bell cranks 4, which are connected to swing type bars 5 up rearwardly against the front side of a platen 6 mounted on a carriage 7. The carriage 7 travels step by step under the control of an escapement mechanism indicated in general at 8. This escapement mechanism includes a rack 9 mounted on the carriage 7 to engage a pinion 10 connected to an escapement wheel 11, which is controlled in its rotation by a pair of pawls 12, which in turn are rocked back and forth by a universal frame 13 This frame 13 is actuated at the swinging of any of the type' bars, by a heel 14 carried by each of the type bars.

Besides a. step-by-step movement of the carriage 7, provision is made for a jump movement ot' the carriage as in tabulating. For this purpose, tabulating keys 15 depress key levers 16 so as to thrust up decimal plungers 17 into the path of stops 18 a'djustably mounted on a rack 19 carried by the carriage 7. Before the carriage 7 can move, however, under the traction of a spring barrel, not shown, it must be released from the escapement'mechanism 8. Each of the-plungers 17 is provided with a shoulder 20 which engages a universal arm 21 on a lever 22, so that as a plunger is thrust upwardly to move into the path of one of the stops 18, it will rock the lever 22 and thus draw down on a link 23 to rock a lever 24 carrying at its forward end a bearing lroller 25, which underlies the rack 9, thereby raising the same out of engagement with the pinion 10 and permitting av movement of the carriage under the trac-tion of the spring barrel, not shown, until the next stop 18 abuts against the projecting plunger 17.

In addition to operating the two actions to print the numbers, the numeral keys 2 also index 0r set up preliminary representation of the digits in the computing mechanism indicated in general at 26. To do this, each of the numeral keys from l to 9 is provided with a depending bar27, which engages an arm 28 on a rock shaft 29 arranged to operate a linkage 30. There is one of these linkages for each of the numeral keys from l to 9, and they are each engaged by an arm 31 carried by the accordant one of the rock shafts 29. The lower reaches 32 of the linkages 30 are employe-d for the purpose of setting index pins 33 provided on denominational column-selecting members 34. The pins 33, however` are normally located out of alinement with the lower reaches 32, 'so that if any reach were depressed, it would pass idly between two transverse rows-of the pins 33.

In order, then, to enable the setting of the pins 33, a denominational selecting mechanism is provided which will accord the denomina-tional member 34 on which a pin is Set with the digit column in which the digit is being printed at any particular instant. For this purpose, there is provided on the carriage 7, one or more tappets 35, which, during the travel of the carriage, come sew'- atc'm into enga ement with a series of jacks 36, so as to roc the same. These jacks engage, at their rear ends, With thrust rods 37, so as to depress these thrust rods and thus rock levers 38, Which in turn actuate link-v ages, 39. The linkages 39 in turn rock bell cranks 40, which engage individually with lugs on accordant ones -of the denomina-J tional members 34, so as to shift them for- Wardly to such a position that their pins 33 lie beneath the lower reaches 32 of the p insetting .linkages 30.

Inasmuch as the carriage 7 travels from right to left While indexing proceeds from left to right, the order of bringing into play of the denominational members 34 .is inverted to the order of actuation of the jacks 36. This is accomplished by the transposition l`mechanism including the levers 38, the linkages 39 and the bell cranks 40. The specific action of this mechanism is described and shown in an application of Frederick A. Hart, filed August 6, 1913,

-No. 783,258, and forms no part of this in ventioii. However, the. result of this action is that the index pin-bearing members 34 are shifted successively and in order starting with the one-at lthe extreme left and proceeding to the right, so as to correspond with the bringing of the letter spaces on the carriage 7 corresponding to the Writing of the several digits, to the printing point of the typewriter, so that the denoniinations of the digits as indexed in the computing mechanism are accordant with the denominations of these digits as they are priiitedby the typewriting mechanism.

After all of the digits of a number to be computed have been indexed on the several pin-bearing denominational members 34, it is necessary to run up these numbers in the computing heads, which include a series of computing Wheels 41, so that the numbers as run up on the computing Wheels can be exhibited through a sight opening 42 provided in the casing 43 of the-machine. To accomplish this, each. of the computing Wheels 41 is provided with a gear 44 engaged by a rack 45 carried by the accordant"k one of the denominational members 34.

The general operator 46 is provided with a cross bar 47, which, at a forward motion of the general operator, engages With such of the index pins 33 as have been set, giving their denominational members 34 forward movements according with the particular pins set and corresponding to the numeral keys actuated in the columns to which their members 34 correspond.

The O'eneral operator 46 may be actuated by han by means of a crank on a shaft 47a having one or more segments 48 engaging pinions 49, which in turn mesh With rack bars 50 carried on the side plates of the general operator.' The general operator also may be driven by power, derived from a motor at the depression of a key 51, which computing Wheels 41, and the denominational members 34 are returned by the cross bar 47 engaging lugs 55 provided on all of these members.

If it is desired to drive the general operator 46 back and forth at a predetermined point in the travel ofthe carriage 7, this may be done automatically by providing one of the stops 18 with an extension suicient to come into engagement With a motor trip 56, vso as to rock the saine in the manner disclosed in said Thornton application, No. 769,132. This trip 56 will be rocked to draw on a link 57, which in turn will rock a bell crank 58 to remove a latch 59 from above a lever 60, so that the latter may rock under the pull of a spring 61, whereby the opposite end of the lever 60, which engages a pin 62 on the key 51, will depress the latter to remove the stop pin 53 from in frontof the lug on the clutch closer 54, thereby enabling the connection of the general operator4 in driven relation ivitli the motor, not shown.

In addition to the present machine being capable of performing straight addition, it is also capable of performing subtraction. For this purpose, the pin-settiiig,mechanism including the shafts 29, the linkages 30 and the arms 31, is of an adjustable type, as ex- ^plained in said Hanson application, No.

626,550, so that itmay be changed to set pins corresponding to the complements of the digits represented by the numeral keys struck instead .of the direct values. That is to say, the mechanism is arranged to carry on What is called complementary subtraction, which consists in rotating all of the computing Wheels a complete revolution less amounts corresponding to the valuesof the keys actuated for the particular computing Wheels. To do this, the shafts 29 are shifted in the manner described in said Hanson application above referred to, to bring the arms 31 out of engagement with pins on one side of the upper reaches of the linkages 30, and into engagement with opposite pins on the juxtaposed upper reaches of these linka es.

gTlie shafts 29 are shiftable in unison by a universal bar 63, which engages a series of alined notches provided in the shafts 29. Thevuniversal bar 63 is pivoted at its upper edge and is provided with an arm 64 Which is engaged with and actuated by anarm on a rock shaft 66. The rock shaft 66 is provided with a second arm 67, which isbifurcated to engage a pin 68 provided on a subtraction bar 69@ The subtraction rod 69 is normally locked in a forward position against the tension of a spring 70 by a detent 71, which engages a notch 72 provided in the subtraction bar 69.

In order to release the detent 71, and thus permit the spring 70 to retract and draw the subtraction rod 69 with it, the detent 71 is secured t0 a shaft 73, which is also provided with an arm 74, whereby this shaft may be rocked against the tension of a spring 75a. The rocking of this shaft 73 may be done manually by means of a 'subtraction key 75, which projects outwardly from the front part of the casing 43, and has a subtraction rod 76 eXtendin rearwardly topivotal engagement with t e arm' 74. It will readily be seen that when the vsubtraction key 75 is pressed rearwardly,

the shaft 73 will be rocked, removing the detent 71 from engagement with the notch 72, so as to permit the spring 70 to retract the subtraction bar 69, thus rocking the bell 4crank comprising the arms 67 and 65, whereby the universal bar 63 will be rocked forf wardly to shift the shafts 29 and the arms 31 carried thereby from their adding to their subtracting position.

In addition to re-arranging the pin-setting mechanism to set complementary num# bers, it is also necessary to set the 9 pins, as explained in the said Hanson application, No. 626,550. For this purpose, each of the 9 pins is provided with a reduced neck engaged by a shifter lever 77, which is pivoted in each case on the accordant denominational bar or member 34. These shifter levers 77 underlie a universal bail 78. The

bail 78 is held in its uppermost position clear of the levers 77, by a spring 79 coiled about a rock shaft 80 on which the bail is secured.

When the subtraction bar 69, however, snaps rearwardly under the traction of the spring 70, a hook 81 pivotally mounted on the bar 69 and engaging in/ a notch 82 provided in an arm 83 also secured to the rock shaft 80, will rock the shaft 80 and the bail 78, so that the latter will come down and depress the forward ends of t-he levers 77 and thus set the 9 pins. Before the subtraction bar 69 has entirely completed its rearward motion, an arm on the hook 81 will come into engagement with a stop or disconnector 84, whereby this hook will be rocked against the tension of a spring 85 out of engagement with the notch 82 permitting the spring 79 to act to retrieve the bail 78 and thus leaving the 9 pins and their levers 77 free and clear in. their set position. vIf by any chance the sprmg 79 should not act, the cross bar 47 of the general operator will, on a subsequent motion, engage an extension 86 on the arm 83, returning the bail and connected parts to their normal raised position.

In addition to setting for subtraction manually, means is provided whereby the mechanism may be adjusted for a subtraction computation automatically at a predetermined point in the travel of the carriage. For this purpose, there is provided on the rack 19 carried by the carriage 7, a subtraction tappet 87, which has a portion 88 arranged to actuate the motor trip 56 at the end of a subtraction zone and which is also provided with an extension 89 extending for substantially a computing zone, which extension projectsto such an extent that it will engage a trip '90 and rock the same when a subtraction zone is reached. The trip 90 is connected to pull on a link 91, so as to rock a bail bell crank 92, which is connected to withdraw a latch 93 from beneath one arm of a bell crank 94 loosely mounted on the shaft 73.

The bell crank 94 is provided with a second arm 95,' to which are secured a pairv shaft 73. The shaft 73 will thus be rocked to withdraw the detent 71 from engagement with the notch 72, permitting the subtraction bar 69 to be snapped rearwardly to its subtraction-setting position by the spring 70.

The purpose of the arms 98 and 100 is to permit a lost motion4 between the shaft 73 and the bell crank 94, so that the subtraction-setting mechanism may be brought into play manually by the actuation of the subtraction key 75, without disturbing the bell crank 94 and the mechanism controlling the same.

The numeral keys 2 are locked against actuation during a subtraction-setting operation, so that in case the mechanism should happen to be in half-set position, the numeral keys will beprevented from operation. To do this, use is made of the normal keylocking mechanism shown and described in an application of Frederick A. Hart, filed December 10, -1908, No. 466,836, which includes a rod 101 extending from each of the thrust rods 27 on the numeral keys 2, and which is adapted toengage between pairs of pivotally-mounted crowding members 102, which act to prevent the entrance of any other of the rods 101 and thus prevent the depression of any other of the numeral keys after one has been actuated.

' To make use of this mechanism, the arm 83 on the bail 78 is provided with a cam heel 103 which engages an arm 104 forming part of a bell crank 105 loosely mounted on the shaft 73. It thus occurs that when the bail 7 8 is rocked to set the 9 pins, the bell crank 105 will be rocked to pull on a link 106, which in turn will swing an arm 107 secured to a shaft 108. The shaft 108 has loosely mounted thereon an intruding arm 109, which is connected by a spring 110 to an arm 111 secured to the shaft 108, so that the intruding arm 109 while not moving rigidly with the shaft 108, will normally be moved up between two of the crowding members 102 and thus prevent the actuation of any of the numeral keys 2. The reason of the yielding connection formed by the spring 110, is to avoid the breaking of any of the parts in case one of the numeral keys should be depressed and the intruding arm 109 happen to be between two of the crowding members 102, there being room for but one intruding member between these crowding members.

' Vhen the hook 81 releases the bail 7 8 and it returns toits normal position, the keylocking mechanism just described will be released by the returning of the parts to their normal position, by mea-ns of a spring 112, so that the numeral keys may be actuated to set up a computation for the subtraction operation. However, if the bail 78 and the parts connected thereto should happen to be disconnected from the hook 81, or should become stuck in their actuated position, then the numeral keys would be locked against actuation until the derangement of the parts had been adjusted.

After a subtraction setting and during the running up of a subtraction computation into the computing wheels 41, the spring 7 0 is automatically retensioned and the subtraction bar set to a normal passive position corresponding to an adding action by the cross bar 47 engaging a lug 113 provided on the subtraction bar 69. The spring 'T0 and the bar 69 will be held in a passive position by the latch 71 engaging in the notch 72 automatically.

It is undesirable tb have the general operator driven while the subtraction-setting bar 69 is in the act of moving to its subtraction-setting position; hence, it is necessary to prevent the motor from being automatically connected up to the general operator at such time by the motor trip 56, as might happen where the operation of the machine is very rapid. It is further undesirable to bring into play the subtraction-setting bar at the moment when the general operator is being connected in driven relation with the motor by an actuation of the automatic motor trip.

T o prevent these actions from taking place automatically, there is provided a safeguard lock, which-consists of a roll-back 190, pivoted at 191 in a fixed portion of the frame and arranged to swing from a position clear of a ward 192 on the subtraction bar 69 to a position obstructing the movement of said ward and subtraction bar 69 when the motor trip 56 is actuated. To do this, there is secured on the latch 59 an arm 193 (Figs. 4 and 10) bent over to eXtend into a notch 191 provided in the roll-back 190.

It will thus be seen that when the motor trip 56 is rocked to connect up the general operator in driven relation with the motor, the latch 59 will be w-ithdrawn so as to rock the roll-back 190 to a position in the path lof the ward 192, thereby preventing the subtraction bar 69 from being brought into play by its spring 70. As soon, however, as the latch 59 returns to its normal position, the roll-back 190 will be withdrawn from its locking position, permitting the bringing into play of the subtraction bar 69 and the subtraction-setting mechanism. On the other hand, if the subtraction barshould be par tially'actuated, the ward- 192 would be in the path of the roll-back 190, preventing it and the automatic tripping mechanism connected thereto from being actuated, so that the general operator cannot be automatically driven at this time. shaped at one end to move aside the rollback 19() in case it should happen to be in its effective position when the subtraction bar 69 is being returned to its silent position.

Ifit is desired to throw the computing mechanism out of operation, a non-add key 111 may be pressed inwardly, so as to operatively disconnect the computing mechanism from the typewriting mechanism.

Before going into details of this mechanism, it wouldbe well'to mention the fact that the tappets 35 are not normally in a position to actuate the jacks 36. That is to say, these tappets 35 are each pivoted on a bar 115 and rest in a depressed position on a bar 116, so that if they were to travel in this position beneath the jacks 36, they would clear them without operating them. However, when a tappet 35 comes into a computing zone, a zone-controlling roller 117 cams the tappet 35 upwardly by engagement with the following roller 118 on the tappet and thus raises the tappet to such a height that it will engage and operate the jacks 36 in succession. The Zone-controlling roller 117 is mounted on a pair of arms 119 secured to a rock shaft 120 and is normally held in a position to engage the following roller 118 by means of a spring 121. The zone-controlling roller and theJ mounting therefor, however, can be moved` against the tension of the spring 121 to clear thel Zone-controlling roller 117 from the path of travel of the following roller 118, so that if a tappet should come along at such a time and the zone-controlling roller was moved to its ineffective position, the tappet would pass idly The ward 192 is cam? beneath the jacks 36 without being raised to action.

Now, then, if the non-add key is pressed inwardly, itforces its stem 122 before it, which stem is pivotally connected at 123 to a thrust rod 121, so that the latter is actuated to rock a bell crank 125 to which it is pivoted. The bell crank 125 is provided with an arm 126 having a pin ,127 underlying an arm 128 on the rock shaft 120. It will thus be seen that when the non-add key 111 is pressed inwardly, it moves the zone-controlling roller 117 against thetension of the spring 121, to its ineffective position, thereby silencing the control of the denominational members 31 from the typewriter carriage 7. Under these circumstances, the numeral keys 2 may actuate the pin-setting mechanism idly as the lower reaches of the linkages 30 will pass idly between the rows of ins 33.

onnection is made whereby the non-add key 111 not only silences the denominational control, but also silences the automatic motor-trip-controlling mechanism and the automatic subtraction-setting mechanism whereby even if the carriage in it-s travel should actuate trips 56 and 90, the general operator, in the first instance, would not be automatically actuated, and a subtractionsetting mechanism, in the second instance, would not. be automatically brought into play. To do this, thel thrust link 121 is provided with a pin 129, which engages a lever 130 pivoted intermediate it-s ends on a shaft 131, and carrying at its farcnd a pin 132 which extends through a slot 133 provided in a latch arm 131 pivotally mounted on the shaft 131.

Thus when the non-add key 111 is pressed' inwardly, it causes the thrust link 121 to rock the lever 130 against the tension of the spring 96, which is connected thereto. This moves the pin 132 in the slot 133, permitting the spring 9T, which is connected to t-he latch arm 131, to draw the latch arm 131 into the Fig. 8 position, when a hooklatch 135 will come into engagement with a stud 136 provided on the bell crank arm 91, which arm, in its normal operation, releases the latch 71 on an actuation of the subtraction trip 90. The latch 135 is also provided with a toe 137, which engages over a stop 13S provided on the lever 60.

It. will thus be seen that while the nonadd key is in its operated position. the bell crank will be prevented from rocking under.

the impulse of the springs 96 and 9T. and also the lever 60 will be prevented from rocking under the impulse of its spring 61. nder these circumstances, even if the

latches

93 and 59 are withdrawn, the subtraction-setting mechanism and the clutch closing mechanism will notbe operated. so that the automatic means for controlling the setting for subtraction and the driving of the general operator by the motor, are silenced.

A lock 139 is pivotally connected to the lever 130, so as to be retracted thereby when said lever is actuated, and said lock projects outwardly through an opening in the back of the casing 13, and is provided with a shoulder 110 to engage a ledge 111 at the bottom of said opening, for the purpose of retaining the lever 130, the latch arm 131 and the parts connected thereto, in their silencing positions. The lock 139, however, is not retracted far enough to engage its shoulder 110 with the ledge 111 when the non-add key 111 is pressed into its active position, as will be understood from Fig. 8, but must. subsequently be positively forced back into its locking position (Fig. 3) by hand. It is therefore evident that so long as the non-add key 111 is held in its set position, the automatic motor control and the automatic subtraction-setting control will be thrown out of play, but unless the lock the subtraction-setting mechanism is cut out of'use for the time being.

This ditferential locking is made possible by the fact that the latch arm 131 has a relative movement or lost motion with respect tothe lever 130, so that while the movement of the thrustlink 121, under the push of the non-add key 111, is insuficient to bring the lock 139 into a position where the locking action can take place, this lock may subsequent-ly be forced in by hand until the shoulder 110 engages the ledge 111 to effect such action without further disturbing the position of the latch arm 131.

It will be noted in passing that the spring 96 is considerably stronger than the spring 97, so that when the non-add key 111 is returned to its inactive position and the lock 139 released. then the spring 96 will return the lever 130 and the latch arm 131 to their inactive positions.

The non-add key 111 when once pressed in to disconnect the communicating mechanism from the typewriting mechanism, is locked in its actuated position, so as to enable the operative to use both hands in operating the machine. For this purpose, there is provided on the thrust link 121,

a pin 142 which engages in an L-slot 143 in a stationary portion of the frame of the ma chine. The reach of this L-slot extends horizontally to guide the motion of the link 124 while being pressed rearwardly and joins with the bend or offshoot of the L-slot at a point where the pin 142 reaches the end of its movement, so that the weight of the link 124 aided .by a spring 144, will cause the pin 142 to drop into the offshoot, preventing the return of the link 124 and the non-add key 114. The parts are shown in this position in Fig. 8. To return the non-add key 114 and the link 124 and the parts connected thereto to their inactive positions, it is necessary to actuate the general operator either manually or from the motor.

The releasing mechanism includes a cam 145 secured on the shaft 47 a, so as to rotate therewith. This cam normally has a depressed portion thereof in` register with a releasing rod 146 when the general operator is in its home position. When, however, the general operator is moved forward, the

shaft 47a will be rotated through the pinions 49 and the segments 48, so as to bring y the rise of the cam into engagement with the releasing rod 146, so as to raise the same against. the tension of the spring 144, which is connected thereto. This rod 146 is also connected to the thrust link 124, so that it will raise the latter to bring the pin 142 out of the oshoot of the L-slot 143, permitting the spring 121, and in case the lock 139 is not in play, the spring 96, to return the non add key 114 to its inactive position. In Fig. 9, the pin 142 is shown as having been raised, by the action of the

parts

145 and 146, from the bottom to the to of the oli'- shoot of slot 143. The releasing rod 146 is guided in its movement by having a pinand-slot connection with a bracket 147 looselyT mounted on the shaft 47a.

Tt is undesirable to permit the actuation of the subtraction-setting mechanism either automatically or manually when the general operator is in motion or in any position other than its normal or home position. To prevent such inopportune action of the subtraction-setting mechanism the subtraction bar 69, which is provided with a -gooseneck 148 embracing and guided by a grooved hub 149 on the shaft 47, is provided with a pin 150 engageable by a locking dog 151 pivotally mounted on the shaft 47a normally under a tendency, owing to the pull exerted upon said doof by the spring 153, to drop behind the pin 150 and prevent the rearward traction of the subtraction bar 69 by the spring 70, even though the locking detent 71 should be released. The dog 151, however, is prevented from moving to its effective or locking position when the general operator is in its inactive home position, by an arm 154 provided on the dog 151 engaging a pin 155 on an arm 156 secured on the shaft 47a.

Vhen, however, the general operator starts in motion, the arm 156 and pin 155 travel away from thearm 154, permitting the spring 153 to force the dog 151 in back of the pin 150 on the subtraction bar 69` thereby preventing the bringing into play of the subtraction-setting mechanism until the general operator has once more returned to its home position and the arm 156 has once more removed the dog 151 from engagement with the pin 150 against the tension of the spring 153.

If it were possible to continue on with a second computation after the first had been indexed by a sett-ing of the index pins 33 without the required operation of the gen eral operator, this would cause a piling up of computations giving an inaccurate result. Hence it becomes necessary to prevent the operative from neglecting to actuate the general operator in case the automatic control thereof should be thrown out of action or not adjusted for action at any particular computing zone.

To warn the operative that a computation has been indexed without transferring it to the computing wheels, use is made of the blinding and locking mechanism set forth in an application of Frederick A. Hart, filed July 17, 1911, No. 638,794. This mechanism includes a special jack similar to the jacks 36 but placed at the left end of the series so as to come into play after all of the others have been actuated. This jack actuates a thrust link, similar to the links 37, when it itself has been rocked by a tappet 35, so that a lug 157 on this thrust link will engage and rock a bell crank 158, which in turn withdraws a latch 159 from engagement with a notch 160 provided in an arm 161 secured on a shaft 162. The shaft 162 is provided with a pair of arms 163 extending upwardly to a point where they are pro. vided with a cross bar 164, which is arranged to be swung over thetops of the numeral keys 2 by means of a spring 165. which rocks the' shaft 162. The rocking of the shaft also swings an arm 166 secured thereto, which in turn draws on a link 167 to swing a shield or blind 168 between the sight aperture 42 and the computing wheels 41, thereby covering the numbers on these computing wheels which are normally exposed. There is' thus provided a double means of warning the operative that a computation `has been indexed land not transferred to the computing wheels, as he cannot operate the numeral keys and cannot. see the computing wheels 41.

ln addition to the above safeguard` it is necessary to preventv a subtraction setting in case of an indexed computation still extant in the nest of pins 33. To do this, the shield or blind 16S is provided with an extension arm 169 having a pin 170 arranged at a rocking of the shield or blind 16S. to engage in a notch 171 forming a hook on the' forward end of the-subtraction bar 69. This, then. will prevent an actuation of the subtraction bar 69 under the traction of the spring 70 until the indexed computation has been transferred to the computing wheels l1. The forward end of the subtraction bar 69 is beveled to permit it to cam by the pin 170 in case the latter should be in its eiect-ive position when the subtraction bar 69 is being moved forward to its ineffective position.

The return of the lever 60 and the bell crank 91-.95 is eii'ected by the general operator during a movement subsequent to their coming into play, so thatl the

latches

59 and 93 can once more lock the lever and bell crank in their set position. In the case of the lever 60, this is accomplished by a cam 172 on one of the side plates of the general operator engaging an extension 173 on the lever 60. In the case of the bell crank the shaft 73 is provided with an arnrl7lf having a cam head 175, which is engaged by the cross bar 17 of-the general operator during the movement thereof. The rocking of this arm rocks the said bell crank of which it forms a part, and raises the arm 91. retensioning the

springs

96 and 97, and thus permitting the return of the latch 93 to its etfective posit-ion. v

To maintain the computing mechanism ,inv a subtracting state after the substraction key 75 has been actuated. a lock bolt 176 may be pressed in to cause a disk head 177 thereon to engage in back of a disk 17S on a pin 179 provided on the thrust rod '76 ot' the subtraction key 75, as shown in F ig. 6. In case it is desired to unlock the subtraction key 75. it is merely necessary to press the subtraction key in a little farther, when the disk 17S will be moved out of engagement with the disk head 177, so that the latter can be pressed out-- wardly into its normal or ineffective position. shown in Fig. 5, by an automatic releaser comprising a spring 130 secured to the rod 76 and urging a pin 181 against the disk head 177. In other words. in order to unlock the subtraction key 75 after it has once been locked in its actuated position, it is merely necessary to re-actuate said key when the bolt 176 will be automatically shoved back to its ineifective position. it being understood that the pressure upon the key is not removed until the return movement of the bolt has taken place.

It will thus be seen that the computing mechanism may be set either manually or automatically for subtraction, with the necessary safeguard for preventing such setting at inopportune times: as when the general operator is in motion or in position other than a home position. or when acomputation has been set up without being transferred to the computing wheels.

Further, it will be evident that the automatic mechanism for driving the general operator and for setting the mechanism for subtraction without thought on the part ot' the operative, may be thrown out ot' action when the computing mechanism itself is thrown out of action, or independently without throwing out of action the computing mechanism.

Variations may be resorted to within the scope ot' the invention, and port-ions ot' the improvements may be used without others.

Having thus described my invention. I claim:

l. The combination, with a computing mechanism, including computation-controlling devices, and a general operator for said mechanism; of a subtraction-setting mechanism acting, when actuated. to set certain of said controlling devices for engagement by said general operator when the latter is in motion; and locking means brought into play automatically consequent upon motion being imparted to the general operator, for preventing the action of said subtractionsetting mechanism while said general operator is in motion.

2. The combination, with a computing mechanism, including computation-controlling devices and a general operator for said mechanism having a movement in action away from a stationary home position and back tcthe same; of a subtraction-setting mechanism acting, when actuated. to set certain ot' said controlling devices for engagement by said general operator when the latter is in motion; and locking means acting automatically, when the general operator is in any other than its home position..to prevent the action of said subtraction-setting mechanism.

3. rI`he combination. with a computing mechanism. including computation-Coutu:lling devices, and a general operator for said mechanism; of a subtraction-setting mechanism acting. when actuated, to setcertain of said controlling devices for engagement by said general operator when the latter is in motion; locking means brought into play automatically consequent uponmotion being imparted to the general operator. for preventing the action of said subtraction-setting mechanism while said general operator is in mot-ion; and means actuated by said gene 'al operator, on returning to normal position, for automatically rendering 'said locking means ineffective.

ing mechanism including a rotatable shaft, a lock engaging said subtraction bar to prevent the actuation thereof by said spring, and means on said shaft for releasing said lock solely when said general operator is iii its unactiiated position.

5. The combination With a computing mechanism, of a subtraction-setting mechanism for said computing mechanism including a subtraction bar, a genei'al operator for said computing mechanism including a shaftv rotatable at the motion of said general operator, a pin on said bar, a dog on said shaft, a spring normally urging said dog into engagement with said pin to lock said bar against movement, and means on said shaft for preventing the action of said spring while said shaft is stationary.

The combination, With computing mechanism, and a general operator therefor; of siibtraction-setting mechanism; means tending to automaticall actuate said setting mechanism; a traveling carriage; a lock for saidsetting mechanism releasable by said carriage, just as the latter enters a subtraction zone, to permit the actuation of said setting mechanism by said automatic means; a drive for said general operator automatically set in action just as the carriage leaves a subtraction zone; said general operator acting, during its initial movement, to restore said setting mechanismto normal position; and an automatically-acting guard lock for said setting mechanism, arranged to come into action during said initial movement of the general operator and prior to the firstnained lock, so as to hold the setting mechanisin against movement out of normal position under the action of said automatic means, during the return movement of the general operator, until said first-named lock again becomes effective.

7. The combination, with computing mechanism, and a general operator therefor; of subtraction-setting mechanism, including a movable controlling bar; means tending to automatically actuate said bar; a traveling carriage; a lock for said bar releasable by said carriage, just as the .latter enters a subtraction zone, to permit the actuation of said bar by said automatic means; a drive for said general operator, automatically set in action just as the carriage leaves the subtraction zone; said general operator acting, during its initial movement, to restore said bar to normal position; and an automatically-acting guard lock for said bar, arranged to come into action during said initial movement of the general operator and prior to the first-named lock, so as to prevent said bar from moving out of normal position, under the action of said automatic means, during the return movement of the general operator. until said first-named lock again becomes effective.

8. The combination with computing mechanism; and a general operator therefor; of

arranged to come into action during said initial movement of the general operator and prior to the first-named lock, so as to hold the setting mechanism against movement out of normal positionunder the action of said automaticmeans, during the return movement of said general operator, until ysaid first-named lock again becomes effective.

9. The combination, With computing mechanism, and a general o erator therefor; of

subtraction-setting mec anism, including a subtraction bar; means tending to automatically actuate said bar; a detent normally holding said bar against actuation by said automatic means, but releasable therefrom to permit such actuation; said general operatingacting, during its initial movement, to restore said bar to normal position;

and an automatically-acting guard lock for said bar, arranged tocome into action during said initial movement of the general operator and prior to said detent, so as to hold the bar against movement out of normal position, under the action of said automatic means, during the return movement of said general operator, until said detent again becomes effective.

10. rllhe combination with a computing mechanism, of a subtraction-setting mechanism for said computing mechanism, a spring normally under a tension tending to bring said subtraction-setting 'mechanism into play, detent means for preventingthe action of said spring and thus preventing the bringing :into play of said subtractionsettingmec anism, and manual controlling means for releasing said detent means.

l1. The combination with a computing mechanism, of a subtraction-setting mechamsm for readjusting said computing mechanism .so as to carry on a subtraction com-y putation, a spring tending to bring said subtraction-setting mechanism into play, a detent for preventing the action of said spring and thus preventing the bringing into play of said subtraction-setting mechanism, a spring holding said detent to its work, and a manually-operable key for releasing said detent against the tension of said last-mentioned spring.

12. The combination with a computing mechanism, of a subtraction-setting mechanism for readjusting said computing mechanism so as to carry on a subtraction computation, Ya spring tending to bring said subtraction-setting mechamsm into play, a detent for preventing the action of said spring and -thus preventing the bringing into play of said subtraction-setting mechanism, a

spring holding said detent to its Work, aJ

matic return of said key.

13. The combination, with a set of computing Wheels, and driving means therefor; of valuating mechanism settable to determine the extent of drive, said valuating mechanism being restored to normal position at the conclusion of the driving operation; subtraction-setting mechanism, including a movable controlling element; and a lock arranged to automatically engage said. controlling element at the conclusion of the setting of said valuating mechanism, so as to preyent actuation of said setting mechanism unt1l the restoration of the valuating mechanism.

14. The combination, with a set oficomputing Wheels, and driving means therefor; of valuating mechanism settable to determine the extent of drive, said valuating mechanism being restored to normal position at the conclusion of the driving operation; subtraction -setting mechanism, including a movable controlling element; a lock engageable With said controlling element to prevent actuation of said setting mechanism; and means for bringing said lock into action automatically consequent upon the operation of saidvaluating mechamsm, and automatically releasing the same consequent upon its restoration.

The combination, With a set of computlng wheels, and driving means therefor; ofvaluating mechanism settable to determine the extent of drive, said valuating mechanism being restored to normal position at the conclusion of the driving operation; subtraction-settting mechanism, including a subtraction bar provided with a lock engageable with said shoulder to prevent actuation of said bar; and means for bringing said lock into action'automatically consequent upon the operation of said valuatmg mechanism, and automatically releasmg the same consequent upon its restoration.

16. The combination With a set of computing Wheels, and driving means therefor; of valuating mechanism settable to determine the extent of drive, said valuating mechanism a shoulder;

being restored to normal position at the conclusion of the driving operation; subtraction-setting mechanism, including a movable controlling element; a blinding device for said Wheels havin a locking arm thereon engageable with said controlling element to hold the same against operation; and means for bringing said blinding device and said locking arm into action automatically consequent upon the setting of said valuating mechanism, and automatically throwing the same out of action at the restoration of said valuating mechanism.

17. The combination, with a set of computing Wheels, and driving means therefor; 'of valuating mechanism settable to determine the extent of drive, said valuatin mechanis`m being restored to normal position at the conclusion of the driving operation; subtraction-setting mechanism, including a movable controlling bar having a notch therein; a movable blinding device for said Wheels; means for bringing said blinding device into action automaticallyl consequentl upon the settin of said valuating mechanism, and throwing the same out of action automatically at the restoration of said vvaluating mechanism; and a locking arm connected to said blinding device to move therewith, said arm arranged tosuccessively engage and disengagethe notch in said bar.

18. The combination, with computing mechanism, including a set of computing Wheels, and driving means for said Wheels; of valuating mechanism settable to determine the extent of drive, said valuating mechanism being restored to normal position at the conclusion of the driving operation; subtraction-setting mechanism, including a movable controlling element; a Warning device associated With said computing mechanism; means for bringing said Warning device into action automatically consequent upon the setting of said valuating mechanism, and throwing said device out of action automatically at the restoration of said valuating mechanism; and a lock connected to said warning device to be operated thereby, and arranged to engage said controlling element, so as to prevent actuation of the latter until the said restoration of the valuating mechanism. takes place.

20. The combination, with computing mechanism, and a set of numeral keysfor operating the same; of locking means for preventing operation of said keys characterof-computation-controlling mechanism, including a movable controlling element;

means for bringing about the movement of .to throw said state-controlling mechanism into action; and means operated by said controlling element, during and consequent upon its said movement, for render-ing said locking means vactive until the active movement of said controlling element is completed.

22. The combination with a computing mechanism including a nest of pins having values from l to 9, of a=subtractionset ting mechanism for said computing mechanism including means arranged to set the 9 pins, said 9 pin se'tting means being arranged to move out of the way after action, and locking means for preventing the actuation of said computing mecha-nism in case said 9 pin setting means fails to clear after an actuation of said subtraction-setting mechanism.

23. The combination, with computing mechanism; of a` subtraction-setting mechanism therefor; a key movable in one direction to manually bring said setting mechanism into play; locking means for holding said key against return movement after having been moved in such direction; and means for automatically releasing said locking means when said key is subsequently moved farther in the same direction.

24. The combination, with computing mechanism; of a subtraction-setting mechanism therefor; a. key movablein one direction to manually bring said setting mechanism into play; a pin connected to said key; a bolt engageable with said pin to lock said key against return movement, after having been moved in such direction; and a releaser for automatically disengaging said bolt from said pin when said key is subsequently moved farther in the same direction.

vQ5. The combination with a computing mechanism, of a subtraction-setting mechanism for said computing mechanism, a subtraction key for manually bringing said subtraction mechanism into play, a pm connected to said subtraction key having a head thereon, a bolt having a head arranged to enga-ge the head on said pin to lock said subtraction key, and a spring-pressed releaser connected to said key for disengaging said heads from each other to enable the release of said key from said bol't.

26. The combination with a. computing mechanism, of means for throwing out said computing mechanism, a general operator for actuating said computing mechanism to run up a number, locking means for said throw-out means, releasin means for said locking means, and a cam z(brought into play at a movement of said general operator to actuate said releasing mea-ns and enable the releasing of said locking means.

27. The combination with a computing mechanism, of means for throwing out said computing mechanism, locking means for said throw-out means, a general operator for actuating said computing mechanism to run up a number, a shaft rotated at the actuation of said general operator, a cam on said shaft, and connections actuated by said cam for releasing said locking means.

28. The combination with a computing mechanism including a series of denominational devices, of a general operator acting to drive said devices variable amounts, a traveling carriage, connections enabling the selection of said denominational devices from said carriage, means for throwing out said computing mechanism, locking means for said throw-out means, and releasing means actuated by said general operator for di-sengaging said locking means'.

29. The combination, with a computing mechanism, and a general operator therefor; of means for throwing said computing mechanism out of action; a member connected to actuate said throw-out means, having a pin thereon; a fixed member having an L-slot therein engaged by said pin, said slot acting to lock said actuating member in one position; a shaft rotatable at the actuation of said general operator; a cam on said shaft; and a link engaging said cam'and connected to said actuating member, to release said pin from its locking position in said slot.

30. T he combination with a typewniting mechanism including a carriage, of a computing mechanism, denon'lination-controlling means for according the denominations as computed by said computing mechanism with the denominations as Written by said typewrit-ing mechanism, throw-out means for rendering said denomination-controlling means ineffective, automatic driving means controlled from said carriage at the end of a computing zone or column for running up a computation, and means actuated by said throw-out means for concomitantly throwing said automatic driving means out of action.

31. The combinaion with a computing mechanism, of a general operator for actuating said computing mechanism, an automatic drive for said general operator brought into play spontaneously at the end of a computing zone lor column, a non-add key for throwing out said computing mechanism, and connections for enabling said non-add key to throw out said automatic drive.

32. The combination with a computing mechanism, of an automatic drive for said computing mechanism, a subtraction-setting mecha-nism4 for said computing mechanism,

automatic controlling means for bringing said subtraction-setting mechanism into action, a non-add key for throwing out said computing mechanism, and connections enabling said non-add key to concomitantly render said automatic drive and said automatic controlling means ineffective.

33. The combination, with a computing,

mechanism, and an automatic drive therefor; of an automatic subtraction-setting mechanism; a controlling device for said automatic drive; a controlling device for said automatic setting mechanism; a nonadd key; means operated thereby for simultaneously rendering both cont-rolling devices ineffective; and means connected to operate the last-named means independently of said key.

34. The combination, with a computing mechanism, and an automatic drive therefor; of an automatic subtraction-setting mechanism; a controlling device for said automatic drive; a controlling device for said automatic setting mechanism; a non-add key; a latch operated thereby for simultaneously Alocking both controlling devices against actuation; and means connected tov operate said latch independently of said key. f

35. The combination With a computing mechanism, of an automatic drive for said computing mechanism, an automatic subtraction-setting mechanism for said computing mechanism, and means for concomitantly silencing said automatic drive and said al1- tomatic subtraction-setting mechanism.v

3G. The combination, With a computing mechanism, and an automatic drive therefor; of an automatic subtraction-setting mechanism; a controlling device for said automatic drive; a controlling device for said automatic setting mechanism; a latch for locking both controlling devices against actuation; and separate devices connected to actuate said latch, one of said devices acting to temporarily hold the latch in actuated i position, and theother to permanently hold said latch in actuated position.

37. The combination, with a. computing mechanism, and an automatic drive therefor; of an automatic subtraction-setting mechanism; a controlhng devlce for said automatic drive; a controlling device for saidA to temporarily lhold the latch in lactuate position', and the other to permanently hold said latch in actuated position; said latchactuating devices .being opera-ble and releasable independently of each other.

38. The combination, with a. computing mechanism, and an automatic drive therefor; of an automatic subtraction-setting mechanism; and a key act-ing, at a single operation thereof, to render said computing mechanism, said automatic drive and said automatic setting mechanism ineifective.

39. The combination, With a computing mechanism, and an automatic drive therefor; of an automatic subtraction-setting mechanism; a key acting, at a single operation thereof, to render said computing mechanism, said automatic drive and said automatic setting' mechanism ineffective; and means independent of said key for rendering said automatic drive and said automatic setting mechanism ineffective.

40. The combination with a computing.

mechanism, of driving means for said computing mechanism, a ,subtraction-setting mechanism for said computing mechanism, controlling means for, said driving means,- controlling means for said subtraction-setting mechanism, vand a single lock common to both said controlling means for preventing the action thereof.

41. The combination With'a computing mechanism, of a subtraction-setting .mechanism for said computing mechanism, a detent for preventing the action of said subtraction setting mechanism, controlling means for said detent, locking means for rendering said controlling means ineffective, and non-add key for temporarily throwing out said computing mechanism and actuating said locking means. p Y

42. The combination'with a computing mechanism, of a subtraction-setting mechanism for said computing mechanism, a detent for ,said subtraction-setting mechanism, releasing means for said detent, and locking means for said releasing means including a latch and a lever for manipulating said latch and having a lost motion relatively thereto.

43. The combination with a computing mechanism, of a subtraction-setting mechanism for said computing mechanism, a detent for said subtraction-setting mechanism,

releasing means for said detent, locking means for said releasing means, said locking means including a latch and a lever for manipulating said latch, said lever having a lost motion with respect to said latch, means ytor manipulating said lever in one direction, and a spring for manipulating said lever in the opposite direction.

44. The combination With a computing mechanism, of a subtraction-setting mechanism for said computing mechanism, a detent for said subtraction-setting mechanism, releasing means for said detent, locking means for said releasing means, said locking means including a latch and .a lever for manipulating said latch having 'a relative movenient with respect thereto, a spring connecting said lever with said releasing means, and a spring connecting said latch with said releasing means.

45. The combination With a computing mechanism, of a subtraction-setting mechanism for said computing mechanism, a detent for said subtraction-setting mechanism, releasing means for said detent, locking means for said releasing means, said locking means includinga latch, and a lever for manipulating said latch having a relative movement ivith respect thereto, a spring connecting said lever with said releasing means, and a spring connecting said latch with said releasing means, one of said springs being stronger than the other of said springs.

46. The combination With computingl mechanism, of a siibtraction-setting mechanism for said computing mechanism, a detent for said subtraction-setting mechanism, releasing means for said detent, locking means for said releasing means, said locking means including a latch and a lever for manipulating said latch, said lever having a lost motion with respect to said latch, a spring connecting said lever with said releasing means, a spring connecting said lever ivith said latch, and locking means for holding said lever and said latch in their ei'ective positions against the tension of said springs. 47. The combination With a computing mechanism, of automatic actuating mechanism for said computing mechanism, means for rendering ineffective said actuating mechanism including a latch and a lever for manipulating said latch having a lost motion with respect thereto, a spring connected to said lever and a spring connected to said latch, said springs opposing each other, and locking means for maintaining said latch and said lever in their effective positions against the tension of one of said springs.

48. The combination with a computing mechanism, of a movable subtraction bar, said computing mechanism including a series of settablev pins corresponding to the values from 1vto 9, a rocking 9pin setting bail, a hooked arm rigidly connected to said bail, and a hook pivoted on said sub- 'traction bar and arranged to catch against.

the hook on said arm to pull the latter with it during the movement of said bar, so as to rock said bail.

49. The combination with a computing mechanism, of a movable subtraction bar, said computing mechanism including a series of settable pins corresponding to the values from l to 9, a rocking 9 pinsetting bail, a hooked arm rigidly connected to said bail, a hook pivoted on said subtraction bar and arranged to catch against the hook on said arm to pull the latter with it during the movement of said bar, so as to rock said bail, and means for tripping said hook out of engagement With the hook on said arm before said subtraction bar completes its movement to enable the return of vsaid bail to its ineffective position.

50. vThe combination with a computing mechanism including a series of settable pins corresponding to the values from l to 9, of a rocking bail for setting the 9 pins, a subtraction bar, means for rocking` said bail in one direction from said subtraction bar to actuate it, a spring for returning said bail after actuation, a general operator for actuating said computing mechanism to run up numbers, and an arm connected rigidly to said bail and arranged to be engaged by said general operator to rock said bail in the opposite direction and thereby positively return it to its cleared position.

51. The combination with a computing mechanism, of a subtraction-setting mechanism for said computing mechanism, a detent for said subtraction-setting mechanism, releasing means for said detent, a spring for actuating said releasing means, a general operator for actuating said computing mechanism`to run up a number, and a cam aiin connected to said releasing means and located in the path of said general operator to be actuated thereby, to return said detent and retension said spring.

52. The combination with a computing mechanism, of a subtraction-setting mechanism for said computing mechanism, a silbtraction bar for actuating said subtractionsetting mechanism, a spring'normally under tension, tending to actuate said bar, a detent for said bar, manual means for releasing said detent, and automatic means for releasing said detent. n

53. The combination, with a computing mechanism, driving mechanism therefor,

land a traveling carriage; of subtractionsetting mechanism, including a movable con-,

trolling element; 'tripping mechanism for point in the travel of the carriage and locking means operated automatically at the op- 54. The combination, with a computing.

mechanism, and a traveling carriage; of driving mechanism for `said computing mechanism, including a movable controlling element; subtraction-setting mechanism, including a movable controlling element; tripping vmechanism for bringing into play the driving mechanism controlling element, operated automatically at a predetermined point in the travel of the carriage; tripping mechanism for bringing into play the setting mechanism controlling element, operated automatically at a predetermined point in the travel of the carriage; and locking means operated automatically consequent upon the bringing into play of one of said controlling elements by its respective tripping mechanism, for blocking the movement of the other controlling element, to prevent the operation of the automatic mechanism associated with said other controlling element.

55. The combination with a computing mechanism, of a subtraction-setting mechanism for said computing mechanism includving a subtraction bar, driving means for said computing mechanism, a roll-back connected to said automatic tripping mechanism, and a Ward connected to said subtractionbar, said Ward and said roll-back cooperating to alternatively prevent the bringing into play of said subtraction-setting mechanism or said automat-ic tripping mechr anism according to Whether one or the other is in 'an initial stage o f operation.

56. The combination with a computing mechanism, of a subtraction-setting mechal nism for said computing mechanism including a subtraction bar, driving means for said computing mechanism, a latch for controlling the action of said driving means, a trip for said latch, a ward on s aid subtraction bar, and a roll-back connected to be actuated by said latch to move into an obstructing position in the path of'said Ward to prevent the actuation of said subtraction bar and said subtraction-setting mechanism While said latch is released.

57. The combination with a computing mechanism, of a subtraction-.setting mechanism for said computing mechanism including a subtraction bar, driving means for said computing mechanism, a latch for controlling the action of said 'driving means, a trip for said latch, a Ward on said subtraction bar, and a roll-back connected to be actuated by said latch to move into an obstructing posltion in the path of said ward to prevent the actuation of said subtraction bar and said subtraction-setting mechanism while said latch is released, said Ward acting at times to prevent the movement of said roll-back and the release of said latch when said subtraction-setting bar has 'started in action and before finishing its movement.

58. The combination, with a computing mechanism, and general operator therefor, including a rotary shaft; of a subti'actionsetting mechanism for said computing mechanism including a subtraction bar; a dog on said shaft adapted to engage said bar, to lock the bar against actuation; a spring normally urging said dog into such engagement; and means on said shaft engageable with said dog While the shaft is stationary, to prevent said dog from engaging said bar.

59.The combination, with a computing mechanism, and a general operator therefor, including a rotary shaft; of a subtractionsetting mechanism for said computing mechanism including a subtraction bar; a dog on said shaft adapted to engage said bar, to lock the bar against actuation, said dog having a projecting arm; a spring normally urging said dog into such engagement; and an arm on said shaft arranged to engage the first-named arm While the shaft is stationary, to prevent said dog from engaging said bar.

60. The combination, with a computing mechanism, and operating means therefor; of a subtraction-setting mechanism for said computing mechanism including a subtraction bar; a detent normally locking said bar against actuation, and normally releasable therefrom to permit its actuation; and a detent brought into play automatically,

Y[consequent upon motion being imparted to said operating means, to lock said bar against actuationV when the first-named detent is released, so long as said operating means continues in motion.

61. The combination, with a computing mechanism, and operating means therefor; of a subtraction-setting mechanism for said computing mechanism including a subtraction bar; a detent normally locking said bar against actuation, and normally releasable therefrom to permit its actuation; a detent brought into play automatically, consequent upon motion being imparted to said operating means, to lock said bar against actuation when the first-named detent is released, so long as said operating means continues in motion; and means actuated by said operating means at the lconclusion of its l motion for rendering the second-named desaid controlling means at a definite point in the travel of the carriage; subtraction-setting mechanism associated with said computing mechanism and including a subtraction bar; and a member carried by said bar for movement therewith into position to block the movement of said controlling means to prevent its actuation by said carriage-controlled member until said bar has completed its active movement.

463. The. combination, with a computing mechanism, operating means therefor, and movable controlling means for bringing said operating means into play; of a traveling carriage; a member under the control of said carriage for automatically actuating said controlling means at a definite point in the travel of the carriage; a swinging member connected with said controlling means to be operated -thereby; subtraction-setting' -mechanism associated with said computing mechanism and including a subtraction bar; and a member carried by sald bar and movable therewith into the path of said swingingmember, to prevent the actuation of said controlling means by said carriage-controlled member until said bar has completed its active movement.

64. The combination, wit-h a computing mechanism, operating means therefor, and movable controlling means for bringing said operating means into play; of a traveling carriage; a member under the control of said carriage for automatically actuating said lcontrolling means at a definite point in the travel of the carriage; `vsubtraction-'setting mechanism associated with said computing mechanism and including a subtraction bar havln a ro ectlon thereon' a member movable into the path of said projection, to prevent actuation of said bar; and a member connected to be operated by said controlling means when the latter is actuated for shifting said movable member into such position at the moment when said operating mea-ns is brought into play.

65. The combination, with a typewriting mechanism; of a computing mechanism including a general operator for running up a computation, and also including an indexing mechanism arranged to be vactuated from said typewriting mechanism; a nonadd key for freeing said indexing mechanism from subservience to said typewriting mechanism, so as to enable the independent actuation of said typewriting mechanism; locking means for maintaining said non-add key in actuated position; releasing means' for said locking means.; and a cam brought into playby a movement of said general operator -and operable upon said releasing means to actuate the same.

G6. The combination, with a computing mechanism; of means for throwing out said computing mechanism including a thrust rod; locking means associated With said rod, to-hold the same in actuated position; a spring-controlled releasing arm pivoted to said rod; a general operator for actuating said computing mechanism to run up numbers; a shaft rotated at the actuation of said general operator; and a cam on said shaft arranged to engage and actuate said releasing arm.

67. The combination, with a computing mechanism including a nest of pins having values from l to 9; of a subtractionsetting mechanism for said computing mechanism including means to set the 9 pins, said 9 pin-setting means being arranged to move out of the Way after action; locking means for preventing the actuation of said computing mechanism; and means for automatically actuating said locking means in case said 9 pin-setting means fails to clear after an actuation of said subtraction-setting mechanism, the last-named means including a bell-crank operative by said 9 pin-setting means, a rock shaft operatively connected Ito said locking means, and a connection between said rock shaft and said bell-crank for operating the former from the latter.

68. The combination, With a computing mechanism including a nest of pins having values from l to 9; of a subtractionsetting mechanism for said computing mechanism including means to set the 9 pins, said 9 pin-setting means being arranged to move out of the Way after action; locking means for preventing the actuation of said computing mechanism;

4and means for automatically actuating said locking means in case said 9 pin-setting means fails to clear after an actuation of said subtraction-setting mechanism; the last-named means including a bell-crankoperative by Said 9 pin-setting means, a rock shaft, a spring-controlled arm loose on said rock shaft and arranged to directlyengage said locking means, and a connection between said rock shaft and said bell-crank for operating the former from the latter.

69. The combination, With a computing mechanism; of an automatic drive for said computing mechanism including a controlling lever; an automatic subtraction-setting mechanism for said computing mechanism including a controlling lever; a single element for concomitantly locking both of said levers against operation; and means for operating said locking element.

70. The combination, with a computing mechanism; of anautomatic drive for said computing mechanismincluding a controlling lever; an automatic subtraction-setting mechanism for said computing mechanism including a controlling lever; a single element having separate portions thereof engageable with both of said levers, for concomitantly locking the same against operation; and means for operating said locking element.

` 7l. The combination, with a computing mechanism; of an automatic drive for said computing mechanism including a controlling lever; an automatic subtraction-setting mechanism for said computing mechanism including a controlling lever; a pivoted latch arranged to simultaneously engage both of said levers, to lock the same against operation; and means for operating said latch.'

72. The combination, with a computing mechanism; of an automatic drive for said computing mechanism including a controlling lever; an automatic subtraction-setting mechanism for said computing mechanism including a controlling lever; a pivoted latch having a hook arranged to engage one of said levers and a projection to en age the ot-her lever,` to simultaneously lock oth leversgagainst operation; and means for operating said latch.

73. The combination, with a computing mechanism; of an automatic drive for said computing mechanism including a controlling lever; an automatic subtraction-setting mechanism for said 4computing mechanism including a controlling lever; a single element for concomitantly locking both of said levers against operation; an operating member for said element' arranged to. temporarily hold it in operated position; and a sec-I ond operating member for lpermanently holding said element in operated position.

74. The combination, with a computing mechanism; of an automatic drive for said computing mechanism including a controlling lever; an automatic subtraction-setting mechanism for said computing mechanism including a controlling lever; a single element for concomitantly locking both of said levers against operation; a controlling lever connected to said locking element; a member for temporarily holding said last-named controlling lever in operated position; and a separate member for permanently holding said last-named controlling lever in operated position. l

75. The combination, with a computing mechanism; of an automatic drive for said computing mechanism including a controlling lever; an automatic subtraction-setting mechanism for said computing mechanism including a controlling lever; a single element for lconcomitantly locking both of said levers against operation; a controlling lever connected to said locking element; a nonadd key forvtemporarily holding said lastnamed controlling lever in operated position; and a member separate from said key for permanently holding said last-named -controlling lever in operated position.

76. The combination, with a computing `computing mechanism including a controlling lever; an automatic subtraction-setting mechanism for said computing mechanism including a controlling lever; a pivoted latch arranged to simultaneously engage both of said levers, to lock the same against operation; aV controlling lever connected to operate said latch; and separate, manuallyoperable members for actuating the lastnamed controlling lever arranged to temporarily and permanently hold the same and said latch in operated position.

78. The combination, with a computing mechanism including a series of settable ins v having values from l to 9; of a roc ing bail for setting the 9 pins having a hooked arm rigidly connected to it; a movable subtraction bar; a two-armed member pivoted to said bar, one arm of'said member being arranged to engage said hooked arm during movement of the bar in one direction, to pull said hooked arm with it and thereby rock said bail; and a disconnecting element arranged to strike against the other arm of said member before said bar completes such movement, to trip said member and enable the return of said bail to ineffctive position. 79. The combination, with a `computing mechanism including a series of Settable ins having values from 1 to 9; of a roc n bail for setting the 9 pins having a.hooke arm rigidly connected to it; a movable subtraction bar; a hook pivoted on said bar and arranged t0 catch against the hook on sald arm, to pull` the latter with it during the movement of said bar and thereby rock said bail; a general operator for actuating said computing mechanism to run up numbers; and an arm connected to said ball enga eable by said general operator, topositive y rei turn said bail to its cleared position.

80. The combination, with -a computing mechanism including a series of settable p ins having values from l to 9; of a rocking lbail for setting the 9 pins having a pairJ member out of such engagement before said bar completes its movement, to release said bail; and a general operator for actuating said computing mechanism to run up numbers, said general operator being arranged to engage the other ofisaid arms subsequent to the release of said bail, to rock said bail in the other direction and thereby positively return it to its cleared position.

.81. The combination witha register and actuating means therefor, of means for changing the condition of the actuating means to cause either addition or substraction to be performed, a member to control the condition-changing means provided with a shoulder, a spring tending to actively drive said member, a latch normally engaged With said shoulder to restrain said member, and

`a manually-operable rocker arranged to rocker for releasing said restrainingmeans.V

83. The combination with a register and actua-ting means therefor, of means for` changing the condition of the actuating means to cause either addition or subtraction to be performed, a member to control said condition-changing means, a spring to actively drive said member, a latch to restrain said member normally engaged therewith, a carriage having means to automatically release said latch, and a manuallyvto release the same.

84. The combination with a register and actuating means therefor, of means to change the condition of the actuating means to cause either addition or subtraction to be performed, a member to control the condition-changing means, a spring. tending to actively drive said member, a latch to restrain said member, a carriage, and separate carriage-controlled and manually-operable devices operatively associatedwith said latch to directly release the same.

85. The combination With a register and actuating means therefor, of shiftable means for changing the condition of the actuating means, a shifter for operating said shiftable means, a spring tending to actively drive said shifter, a latchto restrain said shifter, a carriage, and separate carriagecontrolled and manually-operable devices means, a shifter bar for operating said shift-f` able means, a spring tending to actively drive said bar, a latch normally engaged W1th said bar to restrain the same, a carriage, and

separate carriage-controlled and manually-A operable devices for immediately engaging said latch to release it from said bar.

. OGDEN MINTON.

Witnesses:

TITUs H. IRoNs, F. E. ALEXANDER.