US1449639A - Calculating machine - Google Patents

Description

Mar. 27, 1923.

J. A. V. TURCK GALCULATING MACHINE Filed May l 1921 2 sheets-sheet l Mar. 27, 1923. 1,449,639

J. A. v. TURCK i GALCULATING MACHINE Filed May 19, 1921 9v sheets-Sheet 2 `of the well-known Patented Mar. 27, 1923.

y'UNITED STATES 1,449,639 PATENT OFFICE.

JOSEPH A. V. TURCK, OF WILMETTE, ILLINOIS, ASSIGNOR TO FELT & TARRAN'I MFG. COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

CALCULATING MACHINE.

Application filed May 19,

To all whom z'z may concern.'

Be it known I, Josiirn A. Y. Track, a citizen of the United States. residing in \Vilmette, in the county of Cook and State oi' Illinois, have invented a new and useful lmprovement in Calculatingl Machines, of which the following is a specification.

This invention relates to calculating machines and has for its objecty to provide an improved mechanism for preventing errors in calculating operations, which may arise from mismanipulation ofthe keys; and the invention comprehends the provisionv of means for effecting an indication to the op-4 erator of a mismanipulated key, such indication, in the present embodiment of the invention, consisting in locking the cancelling crank againstf4 operation, whereby, in the eventof a. key mismanipulation occurring during any key st roke of a calculating operation the operator is unable to cancel the machine, until the partial stroke of the mist manipulated key has been completed and the keyboard has been released.

The present invention is preferably employed in connection with theusual keyboard locking mechanism of this class of machines, such mechanism being effective' to lock the entire keyboard of the machine, with the exception of the mismanipulated key, unt-il the partial stroke of that key has been completed; and the invention constitutes a. valuable addition to the error preventing function of such keyboard locking -mechanism, in vthat it prevents the operator from cancelling, without first correcting the error due to a mismanipulated key and releasing the keyboard, and thus effectively prevents the possibility of an error occurring in the last key stroke of a calculatingl operation, because of failure on the part of the operator to observe the. operation of the keyboard loc-king mechanism,

The invention is particularly applicable for use in connection with calculating machines of the key-driven nmltiple-order type, although not necessarily restricted thereto. and, in the present embodiment. is illustrated in a machine` of the general type duplex comptometer, the general character of which is exemplified in the UnitedStates patents to Dorr E. Felt; No. 762,520 and No. 762,521, dated June 29, 1904; No. 1,028,344 dated, June 4, 1912', No. 1,066,096, dated July ,1, 1913;

1921. Serial N0. 470,862.

No. 1,072,933, dated September 9, 1913.; the patent to Kurt F. Ziehm, No. 1,110,731, dated September 15, 1914, and my prior Patents, Nos. 1,357,717 and 1,357,748, dated November 2, 1920. i A y In addition to the general objects recited above, the invention has for further objects such other improvements or advantages in construction and ope-ration as may be found to obtain in the structures and devices hereinafter described or claimed.

In the accompanying drawings, forming a part of this specification and showing, for purposes of exemplitication, a preferred form and manner in which the invention may be embodied and practiced, but without limiting the claimed invention specifically to such illustrative inst-ance or instances 'i Figure 1 is a vertical sectional elevation taken at the left-hand side of a calculating machine of the multiple-order key-driven type, in which the present improvements are embodied; and

Figure 2 is an enlarged vertical sectional elevation taken at"'the right-hand side of the calculating machinel illustrated in Figure 1.

The same characters of reference indicate the same parts in each of the several views ot' the drawings.

In its present embodiment, the invention is incorporated in a calculating machine of the multiple-order key-driven type, such as the well-known comptometer disclosed in prior United States Letters Patents hereinbefore referred to. As the details of construction of this type of machine may be readily understood from these United States patents, a. brief description of the general features of this type of machine, and such parts as are directly concerned with the operation of the present improvements, will be sufficient for an undeista-nding of this invention.

The various instrumentalities of the calculating machine are supported by a frame mounted on the base 2 1 of a casing, said frame consisting essentially of side skeleton plates 22 and intermediate skeleton plates 23 disposed between the various actuating' mechanisms of the several orders of, the machine, and all tied together at suitable points by transverse tie rods 24. A number of columns of nine keys each are provided, each key being indicated by the reference characllO ter 25, and there being a column of nine keys for each numeral wheel that is a duplicate of the other columns, Atogether with the actuating mechanisms and attendant parts inteposed V'between a column of keys and its corresponding numeral wheel. Each column of keys 2 5 forms a part of an accumulator mechanismk for transmitting to its numeral wheel an amount of travel proportioned to the particular key operated, and the accumulator mechanism for each column of keys and the corresponding numeral wheel includes a column actuator in the form of a segment lever 26 pivoted at the rear end of the machine and adapted to be depressed in different amounts,\as determined by the particular keys 25 actuated by the operator. Each key is provided with a stem 27 extending down and bearing upon the corresponding column actuator 26. The key at the extreme front of the machine, being farther from the pivotal axis of the column actuator than the key at the extreme rear of the machine, moves the column actuator through a lesser arc than does the key last mentioned. The keys of each column are numbered from 1 to 9 in front to rear order of the machine; the key at the extreme front is adapted to eiect operation of the column actuator through an arc substantially one-ninth of that produced by the operation of the key at the extreme rear of the machine, and upon depression of interiiiediately positioned keys, the column actuator is moved through arcs proportionate with the value ofthe intermediate key actuated.

The column actuator 26 of each order or column of nine keys is adapted to impart calculating movement to an accumulator, and, for such purpose, is provided at its forward end with a rack 28 which meshes with an accumulator pinion 29, journaled on a transverse shaft 30 that extends across the machine and is supported in suitable bearings in theskeleton frame.

The pinion 29 of each order forms a part of an internal ratchet mechanism, not herein describe-'l but fully set forthin the prior patents hereinabove mentioned; such ratchet mechanism becomes effective on the upstroke of the column actuator to clutch the pinlilon 29=to a lantern Wheel 31, which is n0r ma gearing 33 with the numeralwheel pinion 36.- Tlie latter pinion is journa'led on a transverse shaft 37 and is fixed to y:the numeral or operatively connected by a train of,

train rotates the numeral wheel 38 through an arc determined by the particular key of its corresponding orderthat is actuated. The column actuator is moved upwardly on release of the actuated key, by the column actuator springs 39.

Carrying mechanism is co-operatively combined; with each ordinal accumulator mechanism for the purpose of actuating the accumulator mechanism of the next higher order of the machine whenever a carry is to 'go over from a lower order. The ratio of the several gears and various parts is such that a complete rotation of the numeral or registering Wheel 38l is ac.- companied by a half rotation U of the gear 32 in the gear train 33, so that, at each half rotation of said gear 32, it is essential that a carry go over to the next higher order. y In addition to its function as a member of the gear train 33 for transmitting the motion of the column actuator to the numeral Wheel 38, the gear 32 operates 'as a carrying motor Winding gear and, for lthis purpose, said gear 32 is secured to one end of the carrying motor spring 41. The other end of this motor spring is secured to and constantly tends to impart forward movement to the carrying-escapeiiient member 42, having a stop 43, of well-known construction, which is adapted to be engaged by first one and then the other of the pair of releasing-detents 44 and 45, so that, Whenever said stop is released by one of the detents, the escapment member can make only one-half of a completel revolution, before being checked in its movement by the engagement of the said stopl with the other of the detents; each such half-rotation of the escapement member gives a corresponding half-rotation to the carrying-cam member that is secured upon the left-hand end of the escapement member. The carrying-cam inember is of the type shown and described iii the prior United States patents hereinbefore referred to, and consists essentially ot' a pair of oppositely disposed cam arms against which the dolly roll 47 of` the bell crank carrying lever 48 rides duringI the carrying throws imparted-to such lever by such cams; Each s uclh '1'800 throw of one of these carrying camsjlifts the bell crankn carrying lever suioiently to cause the usual carrying pawl 49 that is pivotally mounted at the rear end of such lever, to throw the lantern-wheel ratchet of the next higher or .left-hand accumulatorone numeral space,

which movement of the lantern-wlieel is iis transmitted through the hereinbefore men- Cil theother ofv itsdetents 44, 45, is effected by the usual dolly roll (shown and described in the hereinbefore mentioned United States patents) that isfmounted on the far side of the carrying motor winding gear 32 and is adapted to ride under a 'cam-faced ear 51, projecting laterally from each detent, when the winding gear 32 rotates intoproper angular relation with the detent to be released.

Inthis manner, it is provided that, while the winding gear32 may, by a full rotation, wind into the carrying motor spring 41 power sufficient to effect two carrying throws of the carrying cam member, the alternate engagement and releasing of the escapement member byfirst one and then the other of the pair of opposed releasing detents 44, 45, whose connecting 'spring 52 constantly tends to draw one or the other of theminto'the path of the stop 43 of said escapement member, restricts each throw of such escapement member to a half-rotation of the winding'gear 32', thereby' releasing only 'one carrying impulse at a time.

In order to prevent either carrying cam of any carrying cam member from effecting a carrying throw of the co-operating carrying lever at a time when the accumulator ofthe higher order impelled by said carrying lever is `alreadyin motion or is about. to be moved by thev column actuator that has been or is being depressed byone of the keys in that higher order, there is -provided a detaining latch tooth 53y formed on the front end of a stop detent 54, in said higherorder,

which stop detent 54 is pivota'lly mounted on the carrying bell crank lever 48' and is adapted to'v be actuated byl a spring 55 to shift said detaining latch tooth into restraining engagement with one or the other of a pair of stops 43, carried by the escapement member. Normally, the retaining latch tooth is held out of engagement with a stop of the escapement member by the dolly roll 56 carried by the column actuator of the next higher order; on 'depression of such column actuator, however, the dolly roll moves out of engagement with the stop detent 54, thereby'permitting the spring 55 to shift said stop detent 54 into such position that th'ef detaininglatch tooth is engaged with one of the stopsof the escapement member; and this relation'of'the parts continues until the said column actuator moves to its normal elevated position. The carrying `escapement member 42 is caught by the detalning latch just after it has escaped lone or'the other of said'escapement detents 44, 45, just suici'e'ntly to prevent re-engagement with said escapementdetents, but not enough tok permit' movement ofv the carrying lever 48. Hence, so long Ias a column actuator is in'a position other than its normal elevated position, and notwithstandingl a release of the kescapemenlt member by either one or the Vthe action that has hereinbe 0rder,-the order that is vto receive thereleased carrying impulse.

It is thus provided that keys may be depressed simultaneously and column actuator impulses delivered in two or more adjacent orders, and yet any carrying impulses re'- leased lfrom a lowerl one of said orders will not be actually delivered to the next higher ofsaid orders until the column actuator movement of such higher order is complete.

vThe operation of permitting simultaneous key-driven actuation of a plurality of co1- umn actuators in adjacent orders, the strokes overlapping each other in an manner, is

ore been referred to as duplexing. l

The carrying lever shaft supports a. spring-pressed back stop 61 for preventing rearward movement of the lantern-wheel 31 during operation by key-actuation. A spring Y 62, connecting' the carrying lever 48 with a fixed portion of the frame, maintains said carrying lever in its normal position and returns the same back to its normal position after each carrying throw. The stop detent 54 is provided at its rear end with a tooth (see said prior patents) for preventing overthrow of the lantern well 31, it being understood that, when the lantern gear is operated by key-actuation, thedolly roll 56 of the column -actuator is shifted from beneath the aforesaid stop detent, permitting the spring 55 to throw the stop detentlinto the position wherein the sald tooth is out of the path of the pinsl of the lantern wheel, but, on return of the column actuator to its normal position, the tooth is again moved into the path of a pin of said lantern wheel. In

carrying, the movement of the carrying lever 48 during the carrying throw lifts the tooth of the stop detent 54 out of the path of the pins of the lantern wheel, and the return movement of the carrying lever restores the stop detent to its normal position.

Such is, i'n brief outline, the manner in which prime actuations and carrying impulses are imparted to the accumulator mechanisms-in the duplezrv comptometers of the above mentioned patents; It will also be understood that these actuating mechanisms are associated with various stop mechanisms set forth in the said patents, to limit the movements imparted `fto the accumulator mechanisms by the prime actuations and carrying impulses; all ofthese stop mechanisms are shifted variously into and out of their various stop positions to impose additional restrictionsto the movement of the carrying fil ldevices and to the prime actuations of the accumulatore. `fl`h'ere is also providedacancelling or zerolzing mechanism for clearing the machine 'or cancelling, that is,for returning the registering wheels and other parts to the zero positlons, and, broadly stated,this zeroizin'g operation is accomplished by disconnecting the connections between the registering wheels 38 and the actuating devices so that, while 'retaining the various above mentioned stop devices in their normal relations ato the accumulator mechanisms, the stored power in the carrying springs may give to the numeral wheels backward rotationsfso as to move them rearwardly from the-divers positions they may occupy and to stopthem when they arrive individually at zero positions. In the present instance, such cancelling is effected by detraining or disengaging the carrying spring winding gears 32 from the gearing on the shaft 30.

The shaft 37 of the numeral wheels is mounted in bearings fixed in the frame of the machine, as is likewise the shaft 30 of the lantern wheels and gearing and the shaft 35 of the gears 3l ofthe gear train 33. In order to effect detraining or disengagement of the gears 32 from the gearing of the lantern-wheel shaft 30, the shaft 5() of the gears 3Q is carried by a swinging frame, indicated generally by the reference character 64, the frame 64 being adapted to have a slight outward pivotal movement on an axis coincident with the sha-ft As the swinging frame carries with it the shaftO of the carrying spring winding gears 3Q, the latter are disconnected from the gearing of the` lantern-wheel shaft `30, ywhenever said swinging frame 64 is imparted anoutwa-rd pivotal movement on the axis ofthe shaft 35. In the prese-nt embodiment of the invention,

the swinging frame is detained in such gear.

detraining position, after a cancelling operation has been effected, until a key Q5 has been depressed to effect a further operation of the accumulator mechanism, whereupon the swinging frameis again restored to position` for entraining the winding gears 32 with the gearing of ,the shaft 30..

The. following instrumentalities are elnployed for effecting movement of the swinging frame to detrain the aforesaid gears and to permit the carrying springs to returnthe registering wheels to zero positions. As shown in Figure 2, an operating'handle or lever7`1, hereinafter termed the cancelling crank is journaled in a bearing in the righthand side plate 22 of theI fixed frame. A segment 72 is fixed to this lever, and pivote-l to said segment 72 is a link 73 which, in turn. is pivoted to a depending lever 7 4 that is pivoted at 75 on the fixed frame. The lower end of said lever 74 is pivotally connected by means of a short link 76 with an arm 77 rotatably mounted with respect to i 'hen the parts are in the relative positions y lindicated in Figure 2, a short swinging movement of the cancelling crank 71 toward the left will. through the segment 72, link 73, lever arm 7l, short link 7,6, arm 77 and rocker arm S0, impart a short rocking moveinentto the shaft 78 in a counter-clockwise direction. as viewed in Figure 2, and such counter-clockwise rocking of the shaft 7 8` is effective, through the instrumentality7 of connections fully described in my Patent No. 1,357,748 hereinhefore referred to, to swing the frame 64 outwardly and to detrain the gears 32 from the gearing of the lantern- 'wheel shaft 30. The action of detraining the earin r releases the car in sirin'csltl ermitting them to unwind'and to turn the several registering wheels*rearwardlyl from theirvarous positions to Zero positions. The unwinding of the carrying springs is terminated by stops` which are projected in operative positions, b-y means of devices and in the manner shown and described in my said prior pat-ent. I- Y `The present invention comprehends the provision of` means for preventingerrors"in calculating operation, by effecting. a positive indication to the operator ofv a mismanipulated key, such indication of key mismanipulation'consisting in locking the cancelling crank against operation, until .the partial stroke ofthe mismanipulated key has been completed and the keyboard. which is'locked as further` incident to 'such-mismanipula tion, is again rleasedfor operation. The invention thus prevents the operator from cancelling, without first correcting the error due to a mismanipulated key and y*releasing the keyboard. thereby preventing the occurrence of errors in the final key strokes of calculating operations, which errors might otherwise occur because of failure on the part of the operator toobservev the' locking of the keyboard. Should akey 25be onlyv partially depressed land released,` the partial key stroke will, ofcourse, effect only a partial operation of fthe accumulator.' mechanism in order which the key controls, and consequently an erroneous result will beindicated in the registration made by the i numeral wheels of the accumulator mechanism. -l-,Vhen any key is partially depresse-l and released, the usual spring at the bottom of its stem willi throw it up, butthe prime' actuator .is locked `in its depressed A position of the locking of the connected lantern wheelandregistering' wheel. y"l`heferror is indicated by the locking of the cancelling crank, and, in the present embodiment of the invention, also by locking of the keyboard in all the orders excepting that in which the mismanipulated key is located.

The keyboard locking mechanism for preventing actuation of the prime actuators or segment levers of other ordinal actuating mechanisms, when a key of one order is permitted to rise before reaching the bottom of its stroke, comprises a rock bar 105 extending across the frame of the machine and carrying with it arms 106 which support a latch releasing rod 107 for latches 108, as described and shown in the said prior United States patents, said latches 108 being adapted to engage respectively beneath co-operating latches 109 on the prime actuators or segment levers.- The bar 105 is normally in the Ainoperative position shown in Figure 1 with the rod 107 engaged beneath tails 111 of the latches 108 to hold these tails elevated and t-he latches v108 out of engagement with the segment levers. Whenever an key is ermitted to rise after a partial own-stro e, thev rock bar 105 is rocked downwardly in a direction to depress the releasing bar 107, thereby releasing the latches 108 and permitting them to move under the influence of their springs 110 to engage and lock all of the segment levers, except the one feeling the influence of the key improperly operated, as

lparticularly set forth in the prior patent to Dorr E. Felt, No. 1,028,344. The segment levers and their keys of all the other orders, thus locked, remain in such locked position until the mistake is corrected by completing the stroke of the previously only partiallydepressed key and the keyboard locking mechanism is released. Completion of the stroke of the partially-depressed key, locks the latter in common with the keys of all the other orders, and, in order to unlock the machine which has become locked in the manner above set forth, there is rovided a key 81 which engages va cross ro 82 supported by tails 83 of the rock bar 105. Depression of the key 81 effects a litin movement of the rod 107 supported in ont of the bar 105, and such lifting movement will cause the instant disengagement of all the latches 108 from the segment lever latches 109, thereby releasing all'the segment levers and keys, with the result that the operator may then proceed with his computation as thou h no incomplete stroke had been given any ey. .Y

As shown in Figure 2, the latch releasing rod 107 projects beyond the arm 106 of the rock bar 105 on the right side of the machine, and the projectlng portion of said rod 107 enters the jawed arm 112 of a bell crank 115 pivoted at 113 on the fixed frame. The lower end of the lower arm 114 of said bell crank 115 is pivotally connected by a link 116 with one arm 117 of a bell crank crank 118 pivoted at 120 on the fixed frame. The bell crank 118 carries a pawl 121 that is adapted to cooperate with rack teeth 122 on the cancellin crank segment 72 in both the forward an rearward movements of said segment to insure a full stroke in both directions of the cancelling crank 71. Connecting the upper end of arm 119 of the bell crank 118 with the pawl 121 is a spring 123, which holds the pawl 121 in yielding engagement with the teeth 122 of the segment 72 during the Y normal forward and rearward movement of the segment 72. WheneverV the rock bar 105 is in its normal position, with 'the latches 108 released from the latches 109, the pawl 121 is in position to permit the normal pawland-ratchet movement of the segment 72, in both forward and rearward movements of said segment, with the result that the cancelling crank 71 may .be operated at will to effect cancelling operations. On partial depression and release of a key 25, however, the rock bar 105 and latch releasing bar 107 moves forwardly and downwardly to permit the latches 108 to engage the segment lever latches 109, and when the error due to key mismanipulation has been corrected the entire keyboard is locked by reason of the engagement of the latches 108 with the latches 109 in every order of the machine. The hereinabove set forth downward movement of the latch releasing bar 107 is transmitted to the jawed arm 112 of the bell crank 115 to effect a forward movement of the arm 114 of said bell crank, accompanied by a forward movement of the link 116. Such forward movement of the link 116 moves the bell crank 118 forwardly, together with the pawl 121, to position the pawl so that its face is directly in the path of the forward end of the segment 72 of the cancelling crank. As long as the pawl 121 is in such position the cancelling crank 71, cannot .be operated because forward movement of its segment 72 is blocked by the pawl 121. Consequently, it is impossible to cancel the machine until the mismanipulated key has been operated to correct the error and the keyboard release key 81 has been depressed to rest-ore the rock bar 105, releasthe latches 108 from the latches 109, and through the connections 112, 114, 116 and 118,' to restore the pawl 121 to its normal position.

The calculating machine described in the above specification embodies various other instrumentalities and devices 'which need not be herein described, for the reason that j they are fully set forth in the prior patents above mentioned,

The term cancelling' crankA wherever employed in the ensuing claims, has been adopted for convenience and is notte be construed strictly, but includes broadl in addition to the specific disclosure o the drawings and description, cancelling or zeroizing mechanism, Whether manually or power operated,

The invention as hereinabove set forth is' 10-ing wheels; actuating devices for said registering wheels rendered operative upon movement of the keys; a cancelling crank including a rack segment movable with said cancelling crank; a pawl normally co-operable with -said rack segment to permit pawl-andratchet movement thereof during operation of the cancelling crank; keyboard locking mechanism rendered operative on partial depression and release of a key in any order of the machine; connections between said keyboard locking mechanism and said pawl for displacing said pawl to block movement of the cancelling crank segment whenever the keyboard locking mechanism is operated; and means for restoring said keyboard locking mechanism to its normal inoperative position, and for concurrently operating said connections to restore said pawl to position for permitting movement of said cancelling crankv segment; substantially as specified.

2. In a calculating machme, in combination: a plurality of ordinal keys; registering wheels; actuating devices for said registering Wheels rendered operative upon movement of the keys; a cancelling crank includ-- ing a racksegment movable with said cancelling crank; a pawl normally co-operable with said rack segment to permit pawl-andratchet movement thereof during opeation of the cancelling crank; keyboard lock-ing mechanism rendered operative on partial depression and release of a key in any order of the machine; and connections between said keyboard locking mechanism and said pawl for displacin said pawl to block movement of the cancel in crank segment whenever the keyboard ocking mechanism is operated; substantially as specified.

3. In a calculating machine, in combination: a plurality of ordinal keys; registering wheels; actuating devices forv said registering wheels rendered operative upon. movement of the keys; a cancelling crank including a rack segment movable with said cance ing crank; a pawl normally'co-operable with said rack segment to permit pawl-andratchet movement thereof during operation of the cancelling crank; keyboard locking mechanism rendered operative on partial depression and release of a key in any order of the machine; connections between said keyboard locking mechanism and said pawl for displacing said pawl to block movement o f the cancellingcrank segment whenever said keyboard locking mechanism and said pawl to their normal positions; substantially as speciied.

4. In a calculating machine, in combination: a plurality of ordinal keys; registering wheels; actuating devices for said registering wheels rendered operative upon movement of the keys; a cancelling crank including a rack segment 'movable with said cancelling crank; a pawl normally co-operable with said rack segment to permit pawl-andratchet movement thereof during operation of the cancelling crank; keyboard locking mechanism rendered operative on partial depression and release of a key in any order of the machine; connections between said keyboard locking mechanism and said pawl for displacingv said pawl to block the movement of the cancellin crank segment whenever the keyboard Ilocking mechanism is operated; and means for restoring said pawl to position for permitting movement of said cancelling crank segment, substantially as specified.

, 5. In a calculating machine, in combination: a plurality of ordinal keys; registering wheels; actuating-devices for said registering wheels rendered'operative upon movement of the keys; a cancelling crank including a rack segment movable with said cancelling crank; a pawl normally co-operable with said racksegment to permit pawl-andratchet movement thereof during operation of the cancelling crank; keyboard locking mechanism rendered operative on key mismanipulation; and means responsive to operation of said keyboard locking mechanism for displacing said pawl to block movement of the cancelling crank segment; substantially as specified.

6. In a calculating machine, in combination: a plurality of ordinal keys; registering wheels; actuatingdevices for said registering Wheels rendered operative upon movement of the keys; a cancelling crank including'a rack segment movable with said can-- celllng crank; a pawl normally co-operable with said rack segment to permit pawl-andratchet movement thereof during operation of the cancelling crank; and means responsive to partial depression and release of a key in any order of the machine for dis lacing said pawl to block the movement o? the cancelling crank segment; substantially as specified. y

.7. In a calculating machine, in combinatlonza plurality of ordinal keys; register- 'mg wheels; actuating devices for said registerlng wheels rendered operative upon movement of the keys; a cancelling crank including a rack segment movable with said. cancelling crank; a pawl normally co-ope'rable vwith said rack segment to permit paWland-ratchet movement thereof during operation of the cancelling crank; and means responsive to mismanipulation of a key in any order of the machine for displacing said pawl to block movement of the cancelling crank segment; substantially as specified.

8. In a calculating machine, in combination: a plurality of ordinal keys; registering wheels; actuating devices for said registering Wheels rendered operative upon movement of the keys; a cancelling crank; a cancelling crank lock; keyboard locking mechanism rendered operative on partial depression and release of a key in any order of the machine; connections between said keyboard locking mechanism and said cancelling crank lock for operating the latter Whenever the keyboard locking mechanism is operated; and means for restoring said keyboard locking mechanism and said cancelling crank lock concurrently to their normal inoperative positions; substantially as specitied.

9. In a calculating machine, in combination: a plurality of ordinal keys; registering Wheels; actuating devices for said registering Wheels rendered operative upon movement of the keys; a cancelling crank; a cancelling crank lock; keyboard locking mechanism rendered operative on partial depression and release of a key in any order of the machine; connections between said keyboard locking mechanism and said cancelling crank lock for operating the latter Whenever the keyboard locking mechanism is operated; and means for restoringV said cancelling crank lock to its normal inoperative position; substantially as specified.V

l0. In a calculating machine, in combination: a plurality of ordinal keys; registering Wheels; actuating devices for said registerin wheels rendered operative upon movement ofthe keys; a cancelling crank; a cancelling crank lock; keyboard locking mechanism rendered operative on mismanipulation of a key; and connections between said keyboard locking mechanism and said cancelling crank lock 'for operating the-latter Whenever the keyboard locking mechanism is operated; substantially as specified.

Il. In a calculating machine, in combination: a plurality of ordinal keys; registering Wheels; actuating devices for said registering Wheels rendered operative upon movement of the keys; a cancelling crank; a cancelling crank lock; and means responsive to partial depression and release of a key in any order of the machine for rendering operative said cancelling crank lock; substantially as specified.

12. In a calculating machine, in combination: a plurality of ordinal keys; registering Wheels; actuating devices for said registering Wheels rendered operative upon movement of the keys; a cancelling crank; a cancelling crank lock; and means responsive to mismanipulation of a key for rendering operative said cancelling crank lock; substantially as specified.

13. In a calculating machine, in combination: a plurality of keys; registering wheels; actuating devices for said registering Wheels; a cancelling crank; a cancelling cra-nk lock; means responsive to mismanipulation of a key for rendering operative said cancelling crank lock; and means operable on correction of the error due tokey mismanipulation 'for restoring said cancelling crank lock to its normal inoperative position; substantially as specified.

14. In a calculating machine, in ,combinar tion: a plurality of keys; registering Wheels; actuating devices for said registering Wheels; a cancelling crank; a cancelling crank lock; and means responsive to mismanipulation or a key for rendering operative said cancelling crank lock; substantially as specified.

l5. A calculating machine provided with keys, registering Wheels, actuating devices for said registering Wheels, and zeroizing mechanism, combined with means, controlled by mismanipulation of a key, for locking said zeroizing mechanism; substantially as specified.

In testimony whereof I have hereunto set my hand.

J OSEPII A. V. TURCK.

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