Nov. l2,_ 1946. r ' Y o. MEHAN 2,411,050 CALCULATING MACHINE? Filed Dec. 25, 1940 10 Sheets-Sheet l NOV. '12, 1946. 2,411,050 T_ Q_ MEHAN CALCULATING MACHINE Filed Dec. 23, I940 10 Sheets-Sheet 2 INVENTOR. _ 7 mas-0. We?. A?... - I Y ATTORNE Y. Nov. 12, 1946. , 2,411,050 T. O. MEHAN CALCULATING MACHINE Filed Dec. 23, 1940 10 Sheets-Sheet 5 INVENTOR. f/xama Q/Ve/Zm Nov. 12, 1946. T, o, MEHAN 2,411,050 CALCULATING MACHINE Filed Bed. 23, 1940 10 Sheets-Sheet 4 INVENTOR. ATTORNEY. Nov. 12, 1946. T. o. MEHAN 2,411,050 CALCULATING MACHINE Filed Dec. 23, 1940 10 Sheets-Sheet 5 IN VENTOR. Nov. 12, 1946.? T.O.MEHAN 2,411,050 CALCULATING MACHINE Filed Dec. 23, 1940 10 Sheets-Sheet 6 INVENTOR Nov. 12, 1946. - T_ 0,. MEHAN > 2,411,050 CALCULATING MACHINE Filed Dec. 25, 1940 LA 10 Sheets-Sheet 7 Nov. 12, 1946. 2,411,050 T. O. MEHAN CALCULATING MACHINE Filed Dec. 23, 1940 10 Sheets-Sheet 8 INVENTOR. BY f/iama (2276mm C5?: " iii Nov. 12, 1946. T'. o. MEHAN 2,411,050 CALCULATING MACHINE Filed Dec. 25, 1940 ,70 ' 7Q 10 sheets-sheet 9 ?Now-12,1946. ~ ?T.'O.MEHAN ' 2,411,050 - CALCULATING ?MACHINE ' Filed?Dec'. 25,v 1940 wj 314 59.14? 0, l ~ I 524 415-=~ 3/13 - 325 10 Sheets-Sheet 1O Patented Nov. 12, 1946 2,411,050 UNITED STATES PATENT OFFICE 2,411,050 CALCULATING MACHINE Thomas O. Mehan, Chicago, 111., assignor to Victor Adding Machine Company, Chicago, 111., a corporation of Illinois Application December 23, 1940, Serial No. 371,366 1 Claim. 1 (Cl. 235-60) 2 This invention relates generally to improve for use with this machine is also shown in the ments in calculating machines and more particu same co~pending application. As this inven tion is particularly concerned with. that part of the machine which performs the addition and subtraction, subject to the control of the key board unit, only so much of the machine as is necessary for the understanding of the present invention is disclosed herein. larly to adding and subtracting mechanisms for use in such machines. The general object of the invention is to pro vide adding and subtracting mechanisms designed particularly for compact arrangement in portable calculating machines. Other objects and advantages of the machine Frame will be mentioned hereinafter or will become ap 10 parent from a perusal of the speci?cation and The frame employed with the present invention comprises a base plate 1 on which are mounted drawings, wherein a preferred form of the inven a pair of outside vertical frame plates 2 and 3 tion has been illustrated and described. and a pair of intermediate vertical frame plates 4 Fig. 1 is a front elevation of a partial assembly of the adding and subtracting mechanisms here 15 and 53. Preferably, a plurality of projections such as G on the vertical plates will extend through cor inafter described. responding slots in the base plate and will be Fig. 2 is a vertical sectional view substantially swaged over to lock the frame plates together. on the plane of the broken line 2-2 of Fig. 1. The keyboard unit fully described in the above Fig. 3 is a vertical sectional view substantially on the plane of the line 2?2 of Fig. 1, looking in 20 mentioned application, is shown in part in Fig. 2 in order that its operative relation to the present a direction opposite to that on which Fig. 2 is invention may be clearly understood. taken. . The outside vertical frame plates are employed Fig. 4 is a side elevation taken at the left side of Fig. 1. not only in supporting the keyboard unit, but also in furnishing the pivotal support for the total Fig. 5 is a side elevation taken from the right side of Fig. 1. key and for the repeat and subtracting keys, and in addition thereto, the support for the ribbon Fig. 6 is a side elevation of a few elements nor mechanism, as will be better understood by refer mally mounted on the main shaft in the fore ence to the above mentioned co-pending appli ground of Fig. 5. Fig. 7 is a front elevation of the main shaft 30 cation. assembly. The full stroke mechanism preferably employed in connection with the present invention is that Fig. 8 is a right elevation of the same assembly. Which is shown in my aforesaid application, Serial Fig. 9 is a partial side elevation of the left side No. 282,787. of the machine, emphasizing the subtractor key Printing mechanism and associated mechanisms. 35 Fig. 10 is an assembly view in elevation taken Controlled in their rearward travel by the key from the right side of the machine, emphasizing stems such as 'i are the stop slides 8, one for the total key and associated mechanism con each bank of numeral keys. A comb 9, mounted trolled thereby. Fig. 11 is a plan view of the accumulator swing ing frame assembly. Fig. 12 is a side elevation of the same assembly. Fig. 13 is a side elevation of the shiftable ac cumulator assembly itself. Fig. 14 is a front elevation of the Zero elimina tor assembly. on the cross channel member i i spaces and guides 40 the set of stop slides. Each slide is normally urged rearwardly by a coil spring l2 connected to the comb at any suitable point on the slide. Laterally extending projections such as 13, suitably spaced, are provided on each stop slide 45 to engage any key stem which may be depressed whereby the corresponding number may be Fig. 15 is a side elevation of the same assembly. printed by the machine. Inasmuch as this application is not concerned Rigidly connected with each stop slide, and off with the keyboard unit, the details of that com set to an appropriate extent for each bank, as plete unit and the frame for supporting it are 50 shown in my aforesaid application, is a bracket not shown in this application. The keyboard 14 pivotally connected with a rack bar such as unit which is preferably used with the present 15. The rack bars are spaced and guided by invention is that which is shown. in my co combs l6 and i7 rigidly supported in any suitable pending application, Serial No. 282,787, ?led July manner by the frame, and are further guided 4, 1939. Likewise, a ribbon mechanism suitable 55 by the rods 18 and I9 which extend through the 2,411,050 3 accumulator mechanism is brought into oper-' ative relation with the accumulator sector 31 in slots 2| and 22, and are urged rearwardly by springs i2. As shown in Fig. 2, each rack bar is provided a manner which will now be described. The accumulator gears 5i and and the zero eliminator gears 53 are mounted in a slid set 25. The upper set engages teeth 2%?: provided ing carriage formed of a pair of side plates 5% on the type carrying wheel 25 which is rotatably and 55, which support between them the shafts supported on a shaft 21 carried between the inter 55, El, and 58 on which the gears are individually mediate frames of the machine. Each type mounted. Also carried by the side plates fill and carrying wheel is provided with a set of numeral types for printing the digits zero to nine, and 10 55. are the accumulator locking plates as and iii, projections on these plates extending into suit preferably each set of type will be a single unit able apertures in the side plates forming the 28 secured by welding, riveting, or otherwise to hinges on which these plates may rotate to look the wheel. Also, each type wheel is provided ing or unlocking position. Each locking plate is with a set of teeth such as 29 which may be en provided with a spring such as 52 and 5:3, as gaged by a bar 3! on the recti?er bail 32 for hold with a set of lower rack teeth 23 and an upper ing the type characters in proper alignment during a printing operation. rl?he operation of shown in Fig. 3, for holding the plate engaged against the type characters. This platen side plates. The accumulator carriage is adapted to occupy with the teeth of the accumulator gears when? ever the accumulator carriage is in its lower in the recti?er bail is the same as described in my operative position. These springs are connect aforesaid co-pending application. It will be understood that it is preferred to use 20 ed ?with the plates and anchored on the posts 64 and 55 which are likewise carried on the carriage a swingable platen roll for pressing the paper be ' mounted oscillatably upon the shaft 33 and rocked forwardly and downwardly to bear against a rearward position during adding and total taking operations and to be slid forwardly for subtracting operations. Accordingly, it is recip ?which the? type is located characters at the in printing the planeplane. of the comb rocably mounted in a swinging accumulator frame comprising a pair of arms 65 and El se As in the case of the machine described in my prior application, the rack bars on any printing cured to a shaft 68 rotatably supported by the cordance with the setting of the numeral keys lowermost extensions of the intermediate frame plates d and 5. The forward end of each of these and their coaction with the lateral projections on arms has an upward extension whose function the stop slides a. will later be described. The rearward portions of Cooperating with the lower teeth on each rack the swinging frame arms are provided with the bar is an adding sector designated ?by its teeth longitudinal slots $5 and ?ii providing slideways 35, and which is mounted rotatably on a shaft for bosses '52 and i3 provided on the accumulator 36. Each adding sector is mounted coaxially with carriage plates at and 55. Each of the carriage and connected through a lost motion mechanism plates is also provided with a laterally projecting to an associated accumulator sector 3'5, having post such as ?ill and it? by means of which the teeth 33. Fixed on the same bushing 39 to rotate about 40 carriage is reciprocated in the subtracting oper ation. shaft 36 integrally with each adding sector 35 For raising and lowering the accumulator is a member iii having an offset ear 42 extending swinging frame, a link 76 is pivotally connected through a slot d3 provided in the associated ac~ to a post ll provided on an upwardly extending cumulator sector 37 and aligned so that it may portion of the accumulator swinging frame arm strike the straight edge margin of that slot. Each 6?, and the upper end of the link is pivotally con member iii also has an car 44 to'which is con operation are enabled to move rearwardly in ac in. nected the associated a. spring 55accumulator extending through sector, the a slot other end of the spring being anchored at M on the ac- V cumulator sector. Thus the initial rearward travel of the rack bar will ?rst rotate the adding sector 35 andv member 15! until the ear 42 strikes the end of the slot 43, after which the sector 35 and sector ill will rotate together. 56 Accumulator mechanism 7 In an ordinary adding operation after the de sired numeral keys in the keyboard have been set, ?the main operating shaft $38 is rotated by the nected with a post '58 carried by arm '59 ?xed on the rock shaft ti carried between the inter mediate frame plates, this latter arm being con nected by the pin 82 to the accumulator selector 83, this pin being rigidly secured to the arm '59 and extending through a slot 85% in the intermedi- ' ate frame plate 5.7 As shown in Fig. 13 and Fig. 2, the side plates of the accumulator carriage are provided with looking slots it], either of which will engage with the?pin 86 on the adjoining stationary intermedi ate frame plate of the machine when the ac cumulator carriage is raised at adding position handle or by any other suitable power means, 60 or subtracting position. whereupon the stop slides in the associated rack bars will begin to move rearwardly, except when ever held stationary by the zero stops in banks where no numeral'keys have been set. ?Each as- ? - Accumulator carriage shifting In'brief, the three sets of accumulator gears are utilized as follows: Those on the shaft 56 are sociated type ?wheel will ?be rotated by the upper 65 lifted into engagement with the accumulator sec tor 31 at the beginning of the return stroke in rack teeth to the proper position to? print the an adding operation, and lowered out of engage numeral corresponding to the key'depressed in ment at the end of the return stroke of the the associated bank. At the same time, the lower operating handle. In a total-taking operation, rackbar teeth will rotate ?rst the adding sector the accumulator gears on the shaft 56 arelifted 35 and then the accumulator sector 3%?. When into engagement with the accumulator sector at the full forward stroke of the handle has been the beginning of the forward stroke of the oper-? completed, all of the type wheels will be in posi ating handle and lowered out of engagement at tion to print their respective numerals and will be temporarily locked in position by the recti?er . the beginning of the return stroke. In a sub-' bail 32. As soon as the'return stroke begins, the 75 total-taking operation, the same accumulator _ 2,411,050 5 gears are lifted into engagement with the ac cumulator sector at the beginning of the forward stroke and held in engagement until the end of the return stroke, whereupon they are lowered. For a subtracting operation, the accumulator carriage is reciprocated forwardly during the forward stroke of the handle and thereafter the accumulator gears on the shaft 51 are lifted into 6 lator gears 5| an equal amount as the adding sectors return to zero. In order to make certain that the accumulator swinging frame is positively held in its lower position during the forward stroke and is held in its upper position positively during the return stroke, there is provided a cam 99 shown in dotted lines in Fig. 5 which will be rotated during the engagement with the accumulator sector 31 at forward stroke underneath a cam follower I III the beginning of the return stroke and dropped 10 and remain in engagement with said cam fol out of engagement at the conclusion of the return lower almost to the end of the forward stroke. stroke. If the next operation is an adding oper The cam follower is carried on one arm I02 of a ation, the accumulator carriage will be automat bell crank, whose other arm I03 is provided with ically returned to its rearward position during a pair of notches as shown to engage a post I04 the forward stroke of the handle, but if the next 15 on the upwardly extending portion of the rear operation should be a total or a subtotal-taking end of the arm 19 a short distance above the link pivot ?I8. The accumulator locking bell~ of those two positions will of itself instantly re crank, consisting of the arms IOI and I03, is turn the accumulator carriage to its rearward held resiliently against the post I84 by means of position. However, if two successive subtraction 20 the Spring I85. Whenever the accumulator operations are performed, the carriage will re Swinging frame has been lifted by means of the operation, the rotation of the total key to either main in the forward position for the second oper ation if the subtraction key has again been actu ated for that operation. Accumulator selector mechanism accumulator selector 83 as described above in connection with an adding operation, or other wise, the upper notch on the bell crank will hold 25 the accumulators in the upper engaged position. When the return stroke is just being completed, the lower rear end of the cam plate 99 is posi In this machine which performs both addi tioned so that it strikes against the post 82 ?xed tions and subtractions, I preferably employ the on the arm ?I9, and as it moves further to the same accumulator selector mechanism which I 30 completion of the return stroke, it forces the have shown in my co-pending application, Serial accumulator frame down to its inoperative posi No. 282,787, which has been referred to above. tion, the yielding mounting of the locking arm So far as adding and total-taking operations are I83 permitting this to occur. This arm is piv concerned, this mechanism is actuated by an oted on the shaft 27 so that it may rock the operating plate 85 ?xed on the main operating slight amount necessary. shaft 48 and carrying an accumulator control The foregoing description of the operation of pawl 86 pivotally carried by the plate on a pin the accumulator selector mechanism applies to 81. The operating plate 85 and the control pawl an adding operation. So far as the lifting of the carried thereby are shown in Fig. 8, while the accumulator frame is concerned, the same de position of the operating plate when at rest is scription will apply to a subtracting operation. shown in dotted lines in Fig. 5. When the ma The functioning of this selector mechanism in chine is at rest the tongue 88 on the control pawl a total key operation will now be described in rests against the left side of the post 89 ?xed on connection with the description of the total key the accumulator selector plate 9|. When the mechanism. operating shaft is rotated on the forward stroke 45 Total key operation of the handle, the righthand notch 92 in the accumulator selector pawl passes underneath the he locking mechanism employed for locking post 89 without pushing against the same, and the total key either in neutral, in total, or in sub as it moves beyond that position, the spring 93 total position is the same as that shown in my attached to the control pawl tends to rotate the co-pending application Serial No. 282,787, above pawl in the direction shown in the assembly mentioned, and therefore will not be described view of Fig. 8. When the forward stroke has herein. Also, for the same reason, the mechanism been completed, the left side of the tongue 88 by which the total key, when rotated either to on the pawl is then resting underneath the post total or sub-total position, clears the keyboard, 94 at the forward end of the accumulator se likewise will not be described here. lector plate 9I. When the return stroke begins, While it will be recognized that in principle the lefthand notch 95 in the control pawl will and in construction there is considerable identity then engage the post 84 and lift it, thereby rock between the total key mechanism shown in my ing the accumulator selector plate about its pivot application 282,787 and that shown herein, a de 95 in a clockwise direction as viewed in Fig. 5. 60 scription of the remainder of the mechanism will At this time, inasmuch as the notch 91 in the be required herein because of its relation to the left side?of the accumulator selector is engaged different accumulator mechanism which this with a post 98 carried by the accumulator se speci?cation discloses. lector plate, the rotation of the latter plate will . -..e total key III, shown in neutral position lift the accumulator selector 83, whereupon the "gs. 5 and 10, from which it is rotatable for accumulator swinging frame will be raised wardly to total position or rearwardly to sub-total through thecooperation of the post 82 which connects selector 83 with arm ?I9 (Fig. 3) and the link ?I6 connected at TI to the swinging frame arm 6?. This brings the accumulators on shaft 56 into engagement with the adding sector teeth position, is attached to a stem H2 secured to a bail H3 pivoted at lid. The lower end of one leg of the bail H3 carries a post H5 extending through a slot I I6 of a bell crank arm I I?! pivoted at I i 3. When the total key is rotated to sub-total position the post 5 i5 acting on slot 5 it will rotate the bell crank counter~clockwise, as viewed in 38. Thereby, when the return stroke is taking place, the various adding sectors which have been rotated from zero position during the for Fig. 5, to place the lowermost edge of the bell ward stroke, will rotate their associated accumu 7:5 crank arm I I8 in position to be engaged by a short 2,411,050 7 7 . post I2I on the side of the accumulator selector control pawl 86 as the forward stroke is being completed, where-by on the return stroke the left notch 55 of the pawl will be held down out of engagement with post 913 of the accumulator se frame (Fig. 3) immediately at the beginning of the forward stroke. This brings the accumulators on shaft 56 into engagement with their associated adding sectors 31, whereby the rotation of each accumulator toward its zero position by the action lector .plate 85. If the notch 95 were permitted to engage and lift the post 355 at this time on the of the spring-propelled rack bars during the for ward stroke will allow a corresponding rotation of the type wheels and cause the printing type wheels to print the amount therein registered at rocked clockwise, causing the selector 3-? to be lowered, which would thereby cause the accumu 10 the end of the forward stroke. As just explained above, the rotation of the lators to drop down at the beginning of the return total key to sub-total position has also swung stroke, as is done in a total taking operation. the lever H9 rearwardly, so that it will prevent Describing further the sub-total operation, the total rotated rearwardly either before or the accumulator lock arm I83 from releasing the after the ?numeral keys have been set in the key 15 accumulators at the beginning of the return s ,roke. Accordingly, the accumulators remain in board, ?whereupon the rotation of the key to sub engagement with the adding sectors to the end total position will rock the total control lever, generally indicated as 522 in Figs. 5 and about of the return stroke and thereby re-accumulate the sums which they previously contained. the axis ?I23. The total control lever proper, The total key is always returned to neutral po designated I22, has its upper end formed as the 20 sition by a spring I44 connected directly to the left leg of a bail IM pivoted at I23, the right and shorter leg of the bail having a rearward exten total key, and the accumulators will be forced out of engagement with the adding sectors just at si?o'n I25 carrying a post 52% positioned to slide the end of the return stroke by the bumping of in a ?reshaped slot Illl formed in one leg of the total key bail I this leg being designated as 25 the lower end of the cam 99 against the post 82, as explained above in connection with an or 5'23, being riveted or otherwise secured directly dinary adding operation. to the key stem I l2 and pivoting about the shaft The function of the slot I45 provided in the us. ?The action of the slot I27 on the post I26, whether the rotation be to sub-total or total posi total control lever will be described later in the tion, has the effect of rotating the total control description of the zero eliminators, return stroke, the accumulator plate 1%? would be For a total-taking operation, the total key is rotated forwardly. The movement of the V shaped slot I2?! acting on post I25 will rotate the further operation, but the mechanism for that bail? I243, causing the total control lever I22 to purpose is the same as is described in my ?co 35 rotate counter-clockwise just as in the sub total operation. However, the post I IE will move pending application 282,787. through the slot ?'6 in the bell crank arm 'I I7 Referring further to the total control lever, the without causing the arm I I9 to rotate, as it does forward leg I29 of this lever is connected by link in a sub-total operation. The rotation of the I3I to an arm I32 secured on a rock shaft I33 lever I22 in a counter-clockwise direction as viewed in Fig. 5 and Fig. 10. At the same time, the keyboard will be cleared and locked against which serves the purpose of releasing the zero 40 total control lever causes the link I39 to throw stop 5343 (see Fig. 2) which, except in a totalizing the accumulator selector '83? to the right, as operation, engages the ear I39 on the rack bar to the extreme left in the bank of rack bars, this viewed in Fig. 5, engaging the notch I42 with the post I43. Therefore, at the beginning? of the for zero stop being pivoted at I35 and held normally ward stroke, the accumulators on the shaft '55 When thus released " this engaged rack by bar,a not spring associated with any stop slide or key bank, will be drawn rearwardly by its spring i?il to the extent determined by the sum, tated back to zero by the adding sectors, and their total will be printed at the end of the forward stroke when the rockable platen is brought into engagement with the type wheels. if any, accumulated in its associated accumulator by tens transfers from the highest key bank on its right, and thus its type wheel may print such sum. In View of the fact that the arm IIB has not been rotated by the total key, the accumulator control pawl will strike the post 94 at the be ginning of the return stroke to thereby raise it and rotate the accumulator selector plate 9| clockwise, thereby lowering and releasing the ac cumulators. Thus, the accumulators, having ' If the accumulator carriage is in subtraction position, the rotation of the total control lever will cause ?nger � at the bottom thereof to push rearwardly on the post I 3i" ?xed on the pivoted arm 538. This arm pivots on shaft 35, and the been restored to zero on the forward wstroke, will slot in its lower end, engaging the post ?l5 on the accumulator carriage, will thereby slide the car riage rearwardly to total position. I A further and'primary function of the shifting of the control lever is to cause the link I39, piv otally connecting post �? on the control lever and post MI on the accumulator selector 88, to ?cause the selector to rotate rearwardly whereby the notch I�on the selector will engage the post I43 on the accumulator selector plate SI and ro tate'the latter a small amount in a clockwise direction. as Fig. 5 is viewed. Thereafter, when will engage ?the adding sectors. During the for ward stroke each of the accumulators will be ro not ?be disturbed during the return stroke. 60 The arm I46 shown in Fig. 10 having a curved slot III?! and a central notch I48, is provided for the purpose ?of locking the total key against op eration while the subtraction key is in subtract ing position. Accordingly, this arm? I46 is fixed on a shaft I49 and is positively rotated down wardly by the operation of the subtraction key to bring the notch I43? into engagement with a post I5I extending from the side of the key stem plate H2. thev forward stroke begins, the forward rotation 70 Subtraction and repeat key ? the operating plate 85, which carries the se The key I52 fixed on the key's'tem I53 serves as lector pawl 86, will cause the right-hand notch a'repeat key when rocked forwardly, as in the of the pawl to engage the post 39 and lift upon aforesaid application ?Serial No. 282,787, and it to lift the selector 83 and thereby post 82, the when rocked. re'arwardly it ?sets up'the ?mechanism arm ?I9, link 16, and the accumulator swinging 2,411,056 for a subtraction operation. The key is .pivoted at I54 and is provided with the notched projec tion I55 shown in Fig. 9 which cooperates with the follower I59 on the arm I51 to hold the key in neutral, forward, or rearward position, the arm engagement with projection I81 during the com~ pletion of the forward stroke and until near the end of the return stroke, as the follower rides over the periphery of the cam. A post I93 ex tending through the slot I94 in the locking arm being pivoted at I59 and being urged toward the key by the spring I59 anchored at I?I. ?When and having an enlarged head bearing against the face of the locking arm is provided to guide the ever the key is rocked to subtract position a pin locking arm in its oscillatory movement. I62 travelling in slot I63 in arm I64, ?xed on shaft The key I52, unless held in subtraction posi I49, will lock the total key in neutral, as previous 10 tion by the operator, is automatically returned to ly explained. neutral during the return stroke in the following The key I52 has a depending leg or ?nger I95 manner: The arm I51 whose follower I55 engages whose function is to prevent the release of keys the notched edge of the key stem to hold it re which have been set in the keyboard when it is leasasbly in either of its three positions has con desired to repeat the addition of a sum set up 15 nected with it at the pivot I95 a link I99, whose therein. A plate I66, shown wholly in dotted other end is connected to the pivot I91 of a dog lines in Fig. 9, and pivoted at M51, is secured at I99 pivotally carried on a rocking plate I99 rock its forward upper end I98 to a bar 599 which ex ably mounted on the ?xed post �. A spring tends across the machine in position to strike all 2m, connected with the dog as shown and an of the key lock slides thereby releasing the set 20 chored on the post 292, likewise carried on the key stems, if the repeat key is not in repeat posi plate I99, normally urges the dog in the direc tion. A plate I1I, mounted on the main operat tion indicated in Fig. 9. Hence, during a forward ing shaft 48 to rotate in unison therewith, carries stroke, the post I12 will rotate the dog I98 against a post I12 which will operate the keyboard clear the action of its spring and'pass thereunder with ing bar on the return stroke, normally. A dog 25 out pushing on ?the link I96. But on the return I 13 pivotally carried at I 14 on the rear extremity stroke of the plate Ill and post I12, the latter of plate I96 is normally held by a spring I15 so will strike the lower end of the dog I98 and lift that its upper end rests against a laterally pro it, since its upper end bears against the sleeve jecting ear I16 on the plate I69. When the plate 299 surrounding the post I61. This lifting of I1I' rotates forwardly with shaft 48 the post I12 30 the dog pushes on the link I95 and releases the strikes ?but passes under the lower end of the follower I55, whereupon the key stem is restored spring held dog I13, but on the return stroke the to normal by the action of the spring I15 caus dog is struck again and since it bears against the ing the pin I11 to bear against the lower end of ear I16 the dog and plate I96 are rotated about the dog �, whose upper end pushing against the pivot I61 to release the keyboard. 35 post I19 will restore the key to normal or neutral However, if the repeat key had been rotated forwardly, the ?nger IE5 at its lower end would have engaged the post I11 on the side of dog I13 position. At the same time, as the key I52 rotates to neu tral position, the lower end of dog I13 will drop and rotated the latter so far counter-clockwise down into its normal position in time to be en (Fig. 9) that the dog would entirely clear the post 40 gaged by the post I12 on cam I 'II and causing I 12, thus avoiding any release of the keyboard. the release of the keyboard as the plate I98 is A plate I18 is secured rigidly to the key stem rotated clockwise. I53 in spaced relation by posts I19 and IBI. A On the forward stroke, cam I9I, which is ro curved slot I*82 in plate I18 is provided so that tatably mounted on shaft 48, is pulled forwardly the plate may rotate relatively to a post I93 by a latch I89 engaged with an ear I89? on a mounted on the adjoining vertical frame member plate I99 which is ?xed on the shaft. The latch and pivotally carrying a dog I84 whose upper end is pivoted at 991? on a post carried by cam I9I will be engaged by the post I19 when the key is and extending through slot I99? in the ?xed plate rotated to subtraction position, thereby rotating 5 99. The spring 299 is connected as shown with the lower end of the dog clockwise (Fig. 9). As the latch and anchored on the fixed plate so the dog is thus rotated, its lower end will strike that when the parts are at rest, the cam rests the post I11 on the side of the dog I13 and will against the stationary post 299'. During the for rotate the latter out of the path of the post I12 ward stroke, the rear end of the latch ?I89 will on the plate I1 I. ~Hence, if the operator desires to strike the pin I92 on the key locking arm I85, repeat a subtraction and will hold the subtraction . thereby releasing the latch, whereupon the spring key so that it will not be released at the end of 299 will draw the cam I9I rearwardly to the ex the return stroke, the keyboard will not be tent permitted by the travel of the pivot post cleared. If the subtraction key were allowed to I91? in the slot I99?. However, the key locking be returned automatically to neutral position arm will still be held up by ?the cam I9I during during the return stroke, the keyboard would be 60 the remainder of the forward stroke. cleared. On the return stroke, in View of the fact that The key I52, if in neutral position at the time cam I9I has been withdrawn rearwardly by spring the forward stroke begins, will be locked against 299, the cam follower I92 on the key locking arm rotation to the subtraction position, or if in sub will ride off the edge of the cam sooner than traction position at the beginning of the forward 65 if the cam had not been retracted. This release stroke, will be locked against, rotation therefrom of the key locking arm is thus timed in such a by means of a locking arm I85 pivoted at I89 which cooperates with the projection I31 on the bottom of the plate I18. The spring I98, an chored on a post I89 supported by the adjoining side frame plate, normally holds this locking arm in lowered inoperative position, but as the main shaft 48 rotates forwardly, the cam plate I9I will strike a follower I92 carried on the side of the locking arm to thereby raise the locking arm into 75 manner that as the locking arm drops down, the subtraction key may be restored to normal dur ing the remainder of the return stroke, as just above described. A further result of the rotation of the key to subtraction position is noted in the action of a post 294, which is ?xed on the plate I18, as it strikes the upper end of the vertical lever 295 pivoted on the side frame at I93. The clock 5,411,056 11 T2 wise rotation of this lever causes the pin 206, carried in its lowered end and engaging the U4 shaped slot 26?, to rotate the bail arm 208 piv oted at 289 in a counter-clockwise direction (Fig. 9). The other arm 2H of the bail has a bifur plained, on the return stroke, which will leave the arm 233 and shifter arm 235 in the position shown in dotted lines in Fig. 4. When the subtraction key is restored to neutral the link 226 and the bail to which it is connected will be restored to cated or slotted end which engages a pin 2l2 the position shown in Fig. 4. on a bell crank generally indicated as 2l3 piv oted at 2 l4, and whose other arm 2l5 is likewise bifurcated to engage the pin 2! 3 in the lower end If the key H52 is still held in subtraction posi tion or is restored thereto while the carriage is still in subtraction position, the downward move ' ' of an arm 2i? ?xed on a rock shaft 2l8 (Figs. 4 10 ment of the link 226 will rock the arm 233 coun and 9). As shown in Fig. 3, the rock shaft 2H3 being thus rotated in a counter-clockwise direc tion (Fig. 4) will cause another arm 2i9 ?xed on the same rock shaft to press downwardly in ter-clockwise so that the hook 226 will be raised above the path oftravel of post 243 during the forward stroke. > However, if the key is in neutral position, the post 243 will engage this hook dur the slot 2!! in the plate 222 by means of its post 15 ing the forward stroke, pull the link 233 for wardly, rocking the shifter arm 225 clockwise, and 229. thereby restore the carriage to adding or total This movement of the arm H9 in a counter position before the forward stroke is completed. clockwise direction pulls downwardly on plate 222, Thus the accumulators will be automatically re which has a central slot surrounding the type wheel shaft 27, and the slot 223 in this plate will 20 stored to position to perform addition if an adding operation follows the subtraction operation. This acton pin 224 to rotate the signal type wheel 225 will leave the parts in the position shown by full (Fig. 3) counter-clockwise a su?icient distance lines in Fig. 4. A spring 24'! bears against post to bring the minus sign type to the printing posi 248, is wound around the pivot 234 and hooks over tion, to indicate that a sum has been subtracted in the operation. At this point it may be stated 25 the link 233 to urge the latter in a clockwise di that the rock shaft 2"; does not move when the total key is operated to sub-total or total position, and although the signal type wheel is rotated, the pin 220 in the slot 22| will not interfere with the movement of the signal type wheel and the plate 30 222 which moves along with it. rection. Thus, the rear end of the arm will bear either against the post 23I, or when the carriage is in forward position and the key � in neutral position, the post 248 will limit the clockwise rota tion of the link. The shifter arm is releasably locked in either position by the arm 249 pivoted at 2A9? bearing against pin 250 on the shifter arm It has been explained above how the operation under the downward. pull of spring 25L , of the total key will positively return the accu mulator carriage to normal total-taking (or add Ac?cumulators ing) position if the carriage should happen to 35 Whether the accumulator carriage is in its rear be in subtraction position when a total is next ward adding position or in its forward subtraction desired, that is the ?nger I31 (Figs. 6 and 10) position, the accumulators when dropped down ?will thrust against post I31?. always are held locked by the locking plates 59 It will now be explained how the carriage is and BI, best shown in Fig. 2. Whenever the ac shifted to subtraction position. When key I52 is cumulators are raised for engagement with the rotated rearwardly, the post 204 rotating inte accumulator sector teeth 38, these locking plates grally with it rocks arm 205 and the bail having will become disengaged from the accumulators arms 208 .and 2H, as previously explained. As when the ears 252 (Fig. 5) strike against the the bail rotates counter-clockwise (Figs. 9 and 4) upper margin of the slot 253 in the right-hand about its axis 209, the link 226 pivotally con intermediate vertical frame plate 5. The pivotal nected at 221 to the bail will be pulled down support for the locking plates is shown in Fig. wardly, guided by its slot 228 on the pin 223. 5 at 254. The laterally extending post 23! carried by the In an adding operation, each accumulator on link will push down the rear end 232 of the arm the ?shaft 56, being engaged with the accumulator generally indicated as 233 pivotally carried at ' sector teeth 38, will be rotated to an extent de 234 on the accumulator ?carriage shifter arm 235, termined by the rearward travel of the associated which itself is pivotally supported at 236. The rack bar, which in turn moves to the extent de extent of the movement of the arm 233 is such termined by the keys in its own?bank. as to rotate it high enough that the upstanding In a total-taking operation the rack bars are projection 23?! on the arm may be engaged by released for rearward movement by their ?springs the post 233 as the latter is rotated rearwardly l2, and the extent to which they may travel will during the forward stroke of the machine. rIhe be determined by the associated carrier pawl act post 238 is ?xed on one end of a lever 239 pivoted ing on the carrier cam ?which is integral with on the frame at 24i and having an open ended slot 242 which is constantly engaged by a post 243 60 each accumulator wheel. ?Referring to Figs. 2, 11, and 13, it will be observed that each of the ?xed on the side of a cam plate 244 mounted on accumulator gears 51 on the shaft 56 carries in shaft 48 and rotating therewith. As shown in tegrally with it a cam 255 which has a projection Fig. 4 the shifter arm 235 has a slot 245 in its ?256 for cooperation with the ?carrier pawl. ?The lowered end and which is constantly engaged with carrier pawl itself is shown in Fig. 2 as 251, piv a pin 14 ?xed on the left side of the accumulator oted for oscillation about a shaft 258, and having carriage. Consequently, When the key I52 has a cam follower projection 259 which rideslon ?the been rotated to subtraction position and the arm carrier cam whenever the ?accumulators ilil are ?233 rocked upwardly and the forward stroke raised. The spring 25,! insures this contact of thereafter initiated, post 238 will push against the shoulder 23'! to thereby push arm 233 bodily For the pawl and cam. 'Whenthe accumulator is being rotated toward ?zero during .a, total-taking rearwardly, rocking the shifter arm 235 about operation, 'it may continue to rotate :until the its pivot 236, thus throwing the accumulator car *nose 259 of the carrier pawl Sstrikesthe radially riage to the forward subtraction position. If the extending face of the carrier cam projection 256. key is not manually held in subtraction position, _This is at the zero position of the accumulator. 1 it will be automatically released, as heretofore ex 13 2,411,050 Of course, it will be understood that in a sub total operation after each accumulator has been rotated to zero and stopped by the above de scribed cooperation between its carrier pawl and cam projection 256, the return stroke of the machine, with the accumulators still engaged with the accumulator sectors, will restore each accumulator to the position formerly occupied arms 66 and 67 will bump against the lower? portions of the carrier pawl locking dogs 212. (Fig. 2) and rotate each of them, if previously? displaced back to the position shown in Fig. 2.. However, if any of the carrier pawls have been. lifted, they will still remain raised because of the: engagement of the notches 276 with the ears 2l5.~ The carrier pawls are restored to their normal. by it before the sub-total was taken. position as follows: Referring to Figs. 2, 3, 6, and. The tens transfer is accomplished as follows: 10 8 it will be observed that the plate 85 ?xed on During an adding operation the accumulators on the main operating shaft carries a post 271 which. the shaft 52 are raised and meshed with the ac at the normal position lies in a notch 218 in the cumulator sector teeth 38 at the beginning of carrier restore pawl 279. This pawl is pivotally' the return stroke. The rack bars having moved rearwardly in accordance with the key setting 15 carried at 26| on the plate 282 which in turn. is pivoted on the rock shaft 2E8. The spring 283; in their associated banks are restored to their connected to the pawl and plate serves to hold normal forward position by means of the rack the pawl against post .217. The plate 282 whose restore bail 262. This bail is carried on a pair rearward extremity normally rests against the. of arms pivoted on the shaft 27, one of the arms 263 being disposed outside of the right-hand 20 post H8 constitutes one leg of a bail having a cross bar 264 held downwardly by the spring 285,. intermediate frame plate, and the other 264 being and whose other leg is the arm 286 pivotally mounted outside the left-hand intermediate frame connected at 281 to a link 238 pivotally con plate. The latter arm is provided with a gear sector 265 meshing with another gear sector 266 mounted on the cross shaft 261 'and connected 25 in any suitable manner to rotate integrally with meeting it at 28% to an ear 29| depending from a carrier restore plate 292 fixed on the rock shaft (Fig. 3). When the plate 85 (Fig. 6) begins to rotate at the beginning of the forward stroke?, the rack restoring cam 268. This mechanism, the post 211 will push against the pivot of the described in my aforesaid application, is operated pawl 219 and rock the bail 282-286 in a clock by the post 26% mounted on the side of the cam wise direction as seen in Fig. 2 or in a counter? plate HI, the post entering the cam surfaces 30 clockwise direction as seen in Fig. 3, causing the formed by the bifurcated legs of the rack restore carrier restore comb 292 to swing downwardly cam and positively restoring the various type toward the uppermost teeth 38 of the adjoining wheels and their associated racks to normal posi accumulator sectors (Fig. 2). If any of these tion as the bail rod 262 engages the bottom of the accumulator sectors have rotated one tooth be curved slot 2'? in each type sector wheel during 35 yond the position shown in Fig. 2, that is whereby the return stroke. ? their ears 2'55 have entered a carrier pawl notch As the racks are propelled forwardly to their 276 in tens transfer position, the carrier restoring normal position by the bail rod 262, the lower comb 292 will push them all back to normal, and set of rack teeth 23 acting on the accumulator the associated springs 26l will restore the carrier sector teeth 35 will rotate each accumulator sec 40 pawls to the position shown in Fig. 2. Hence, tor towards its normal position, which is shown this machine, as is equally true of the machine in Fig. 2. But if any accumulator gear 5| shall described in the above mentioned patent applica have during the return stroke of the adding op tion, does not require an idle stroke between an eration rotated past its zero position, the sloping adding operation and a total-taking operation. side of the carrier cam projection 256 will have lifted the associated carrier pawl and enabling the latter to become locked in raised position. The mechanism for locking is shown in Fig. 2 consisting of a locking pawl 272 rotatably mount ed on shaft 233 and held under tension by spring ? 26 I. Should the carrier pawl be rotated to raised position, the shoulder 273 on the carrier pawl will?be rotated down far enough to permit the lowermost edge v2M of the locking dog to override the end of the pawl and thus hold the carrier pawl in raised position even after the projection on the carrier cam has passed. Referring to Fig. 2, it will be observed that therefore as the accumulator sectors 31 are being rotated counter When a subtraction is being performed, the accumulator gears 52 on the shaft 5?! are raised into engagement with the accumulator sector teeth 38, and the carrier pawls cooperate with the carrier cam projections 256? in the same manner as they do in the adding operation justv described. If during subtraction, any accumu-� lator on shaft 57 be rotated past its zero position, the carrier pawl which will be thereby raised and; locked will enable the accumulator to the left thereof to rotate one tooth further, thereby sub tracting ten from the adding accumulator in gear therewith. The third set of gears 53 on the shaft 56 are provided for the purpose of operating the zero clockwise to their normal positions, the laterally 60 eliminators which will now be described. projecting ear 215 on any accumulator sector plate will be able to enter the notch 2116 on the carrier pawl to the right of the individual ac cumulator sector if such pawl to the right has been raised. Thus, after the rack and adding sector have rotated the gear to the extent de termined by the key setting in its own associated bank, the spring 1&5 connecting the adding sector and accumulator sector will rotate the gear one Zero eliminators To eliminate the printing of zeros to the left of the ?rst ?gure which should be printed in any total printed by the machine, that is where the total is less than the full capacity of the machine, zero eliminators as shown in Figs. 14 and 15 and Fig. 2 are provided to cooperate with the third set of accumulator gears on the shaft 58. Each of these accumulators is provided with a cam 30! having a notch 362 which will occupy the posi tooth further if the carrier pawl to the right thereof is held locked in raised position. Thus the tens transfer is accomplished. tion shown in Fig. 2 if the highest ?gure in the As the accumulator carriage is dropped down total does not extend into the bank with which at the end of the return stroke, the cross bar 270 which extends between the accumulator frame 75 any such accumulator is associated. When the total key is operated either to sub-total or total 15 position, the, rocking? of the, total control, lever, generally indicated. as. 51712, in Fig, 1.9,.Wil1 cause the. slot, lddto, push rearwardly against a pin; 383 mounted on, the sidcqf ahlever 353% (Fig. 5) piv wardly into thelcamrecesses 3132 may dosoinas stitutes the pivotal,connectionbetween the lever 3'38, (Fig. 3), fixed, on the rock shaft sea and the rightand side plate 311 of the zero eliminator integral over a shoulder 329 on the eliminator much as theslots 325 and?SZl in the eliminators no ?t; such movement under the action of the individual springs 3 l 9 ' However, each eliminator is provided with a oted on post, 305, pivotally connected with a, 5 projection 328 which extends, as shown in Fig. 14, post 3&5, extending through a slot 301 in the to, the left from the eliminator with which it is intermediate sideframe plate._ The, post 3135 con next to the right thereof. Consequently, if? any eliminator be held partially raised by the high portion of its eliminator cam, every eliminator to the right thereof will likewise be held up by theeo-action between these projections 328 and the shoulders 339. Hence for example, if the frame. This plate has a slot 3I2 surrounding a cross rod 3 i BwhiCh passes through allot the zero eliminators andwhich is ?xed on the side frame members 3}! and 3H! of the zero eliminator as sembly, Accordingly, when the rotation of the 15 ?fth bank from the? right contains a sum which should be printed in a total, its eliminator cam total control-lever pushes the post 383 rearwardly, will not be in zero position, its eliminator will be causing the post Stifto be pulled downwar l , the assembly frame-members 3H and 3M carry the rod 313 downwardly and thereby carry along with them each of the individual; eliminators such as 315, 3J5, 3H, and?ld, illustrated in Fig. 1%. That held up-by the high portion of the cam, and every eliminator to the right will likewise be held up, 20. and the type wheels to the right will print zeros ' or higher digits in ?accordance with the total then existing in the machine. Restoration of the total, is, the individual eliminators are pulled, down lever to normal position will in an obvious man ner restore the eliminators to their inoperative wardly by their individual springs such as 31$, which are connected to the plate 32! which ex position, which is shown in Fig. 2. A spacing comb 332, shown in Fig. 2, is provided for spacing the accumulator sectors, and the comb 333 serves to space the ends of they carrier pawls and, the lockingpawls. Another comb 334, shown tends across the rear of the movable eliminator frame serving as an anchor for the springs. When the forward stroke begins and the accumu lator carriage is lifted,? the lower ends of the eliminato'rs' will contact the eliminator cams 393. ' Combs 322 and? 323 are provided as shown to 30 in Fig. 2, spaces the type Wheels. While one embodiment of the present invention maintain the spaced alignment of the eliminators. is herein illustrated� and described in considerable Each eliminator carries on its upper forward detail, it should begunderstood that the invention portion a, roller, 32d, and?, when the eliminators is. capable off considerable modi?cation without are inoperative, these rollers are positioned slightly above the rear projecting portion 325 of 35 departing, from the spirit and scope of the inven tion de?ned in the appended claim. . each of therack bars. Consequently, in adding Having shown and described my invention, I operations the rack bars may slide underneath the. rollers and betweenthe eliminators without In? a calculating machine, a pair of parallel interference. But in a total operation when the claim: ? ' , ? ' eliminators are lowered, if any eliminator is not 40 shafts. one above the other, type wheels on the upper shaft, accumulator driving gears on the drawn into a zero recess 302 of its associated cam, lower shaft, ?numeral key-controlled means re the rear end 325, of, the associated rack will pass ciprocating between said shafts for driving the under and lift. slightly on the roller to prevent any type wheels and said gears, sets of three pinion further downward: movement of the, eliminator. gears intermeshed on three adjacent shafts, one To the left of the accumulator representing the 1 of each set being selectively engageable with the highest denomination in the total there? may be driving gears for addition, a second of each set one or more accumulators in zero position, and being engageable with the driving gears for sub their associated eliminators will enter the recesses traction, and means co-acting with the third of 302m their cams, and. the rollers carried by such eliminators will drop down far enough to posi- , each, set of gears, in total-taking operations for . preventing the printing of zeros to the left of the highest order digit in the total, said pinion gears being. arranged for reciprocation in the plane of their axes and, in a_ direction perpendicular to tively block anyrearwardmovement of these as sociated racks. Hence, the associated type wheels cannot rotate out of non-printing position even though they havebeen released-bythe key board, and they will thereforev not print zeros. When the eliminators havebeen lowered? by the total control lever, any that are able to be pulled down . their axe-s. THOMAS O. MEHAN.