US1490129A - Calculating machine - Google Patents

Description

April 115 "1924. I v 1,490,129

' j A. F. lPOOLE CALCULATING MACHINE Filed Jan. '7, 1922 4 sheets-sheet 1 tuning;

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, HlE ATTE RNEY April 15 1924. 1,490,129

, A. F. POOLE CALCULATING MACHINEIl l Fued Jan. 'f 1922 4 sheets-sheet 2.

INVENTR lvflf 3%@ Zaan/l QAMM H1B/11111111151 .WITNEEEES April 15 1924. 1,490,129

A. F. POOLE GALULATINGMACHINE Filed Jan. 7, 1922 4 Sheets-Sheet 3 'WWNEEEIEE *1m/'Emma- I .H15 TTURNEY April 15 1,924'.

, A. F. POOLE CALCULATING MACHINE Filed Jan. '7, 1922 4 Sheets-Sheet 4 w|TNE55E L NVENTUR f f QM ML NM@ aga-6 l5 ATTURNEY citizen ofthe United States, and resident of y Patented Apr. 15, 192.4.

UNITI-:n s'rArEs ARTHUR F. POOLE, AOils" KENILWORTH, ILLINOIS, ASSIGNOR TO REMINGTON ACCOUNT- PATE-NT OFFICE.

ING MACHINE CORPORATION, OF NEW YORK, N. Y., A CORPORATION 0F NEW- YORK.

CALCULATING MACHINE.

Application filed January 7, 1922. Serial Nb. 527,605;

To kall whom t may concern.' l

Be it known that I, ARTHUR F.- POOLE,

Kenilworth, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Calculating Machines, of which the following is a speci ication. Y

My invention relates to calculating ma` chines, and especially to calculating machines capableof giving the algebraic total resulting from a series of additions and sub tractions. One ofthe principal objects of my invention is to provide a clearance proof mechanism for algxbraic totalizers. My invention also inclu fles' certain improvements in algebraic mechanism itself.

ToI the above and other ends my inven` tion consists in certain features of construction and combinations and arrangements of parts, all of which will be fully set forth herein and particularly `pointed out in the claims.

In the present instance I have shown my invention Yapplied to that form of the Remington accounting machine which includes across footer and which is shown and described in the patent to John C. Wahl, No. 1,270,471, dated June 25, 1918.

In the accompanying drawings,

Figure 1 is a partial conventional front elevationfof a Remington machine of the kind above mentioned, with my improvements applied thereto.

Figure 2 is a-fragmentary detail view of the algebraic totalizer in vertical section substantially on the line 2, 2 of Figure 5.

e FigureB is fragmentary lisometric view of a part of the cross actuator.

Figure 4 isla fragmentary top plan view of a portion of the clearance proof mechanism, partly sectioned away.

Figure 5 is afriglit-hand side elevation of the algebraic totalizer with the side plate removed an'd shows fragments of some of the associated parts. l

Figure 6 is a top view of said totalizer in Section on the line 6, 6 of Figure 5.

Figure 7 is a front to rear verticalvsec.- tion through said totalizer' on the line 7, 7 of Figure 6.-

Figure 8 is an isometric view of someof the principle of the clearance proof mechamsm. v

Figure 10 is a right-hand side elevation, somewhat diagrammatically illustrating 'the clearance proof mechanism. l

Figure 11 is an isometric view of part of the totalizer.

y Figure 12 is a diagrammatic view of the two dial .wheels at the left ends of the respective series of dial wheels. -v

Figures 1, 8 and 4- are on a smaller scale than` the remaining views.

The Remington accounting machine is so well known and the calculating mechanism of it is so well described in the Wahl patent above referred to, that I. have illustrated only those fragments of the machine which immediately co-operate with the present vinvention. Said machine includes a Remington typewriter having mounted on its stationary framework the stationary framework of the Wahl calculating mechanism, the latter including a cross bar 15,a fragment of which is shownin Figs. 1 and 4. A main truck, not shown, is supported at the middle of thel machine on wheels journaled in said cross bar on frame-piece 15, and at paper carriage of the typewriter, and on said truck may be mounted any desired number of vertical orcolumnar totalizers 16 and dummiesr17, the latter lconsisting of a frame similar to that of a totalizer 16, but devoid' of calculating mechanism. The machine also includes a cross truck 18 adaptedV to reciprocatev to the extent of asingle computing column, said cross truckrhaving a hook 20A and a co-operating stop-piece 21, pivoted to the truck at 22 and adapted, when the carriage comes into an adding zone in traveling from right to left, to engage with a lug 23 constituting a part of the righthand frame lplate of one of the totalizers 16 or dummies 17, so that thev truck shall be picked'up by the lng. The cross truck 18 .is drawn toward the right by a spring and vit normally occupies its right-hand position,

and in said positionthe stop-piece 21 is 'depressed out of .thepath of the lugs 23, but

the hook 20 stands in the path of said lugs.

' Vhen the carriage is moved towardA the left these lugs successively pick up said hook and draw the cross truck toward the left andas soon as said truck begins to move, the stop 21.risesI to the position shown in Fig. 1. At the end of a movement equal to the width of a computing column the hook 20 and stop 21 are cammed down out of the path of luf,v 23 and the cross truck immediately jumps toward the right ready to be picked up by the same or some other totalizer or dummy.

The frame-piece 15 has secured to the right-hand art thereof the stationary framework of) the cross footing mechanism, which framework includes amon other things a vertical end plate 24, a paral el plate 25, and a cross rod 26, Fig. 3, connecting said lates. A lever 27 is pivoted' at 28 to the ate 24 and it is normally pressed ,towar the left by a spring 30. The truck 18 has an Vadjustable sto bar 31 which when said truck jumps bac toward the right is adapted to strike the upper part of the lever 27 and press it back against the plate 24 and said truck is thus arrested. This lever 27 is not only art of the stop for limitin the right-hand) movement of the cross truc but it is also a part of a locking mechanism which is fully described in the Wahl patent above referred to. Said lever has articulated therewith a long link 32 which is connected with the locking mechanism in the manner described in said patent. Said locking mechanism also includes a roller 33 indicated by dotted lines in Fig. 1, which roller is normally held up by a spring but is adapted to be depressed whenever one of the vertical totalizers or dummies passes over it, each of said totalizers and dummies having a certain track-way 34 mounted thereon for the urpose. The mechanism includes the usua numeral keys of the typewriter, which keys are connected with the Wahl actuator and which actuator includes a certain rocker or universal bar. The mechanism is so designed that when the roller 33 is depressed by a totalizer or dummy and the lever 27 is' pressed back against the plate 24, then said rocker or universal bar is locked to warn the operator that he has got the carriage in an adding column but has not hooked up the p cross truck, so that if the keys were o erated the number would not be accumulate in the cross totalizer. This lock is thus referred to because I use it in connection with my clear- Wahl totalizer.

Thus the rear parte of said plates 36 are made with the usual dove-tail formation so that they fit over the dove-tail cross truck 18. A rock shaft 37, having a. linger piece 38, is pivoted in said frame plates precisely as in a Wahl totalizer, except that for reasons that will hereinafter appear, said fingen piece is not at the extreme right-hand side of the totalizer. Said shaft has on it a pair of hooks 40, which hook over the truck 18 and one of which is provided with a tooth 41 working in a notched plate 42 secured to the front face of the cross truck 18. A rod or shaft 43 is secured at its ends in the plates 36 by means of screws 44, Fig. 2, and on said shaft are journaled any desired number of carrying wheels 45. As here shown these wheels are identical in construction and -location and function with the carrying wheels of a lVahl totalizer. They are adapted to mesh with the cross master wheel 46 which drives them, and they carry each to the next of higher order by means of Geneva wheels 47 mounted on levers 48, which levers are pivoted on cross bars 50 and 51, these levers 48 extending down below the totalizer at the rear thereof into position to be operated by the regular Wahl auxiliarymaster dog 52. lVith certain exceptions which will be mentioned hereinafter these levers are identical 'in construction, function and mode of o erapivoted in the side plates 36 at 56. Said.

levers are controlled by sprin s 57 connected to cross `rods 58, these parts eing substantially like parts of the Wahl machine. Stationary bars 60 extend across the totalizer in position to align the Geneva wheels 47 whenever the latter are lifted out of engagement with the carrying wheels 45. The carrying wheels 45 drive a set of intermediate gears 61 journaled on a shaft 62 sup orted by the side lates. 36. These whee are made larger t an the intermediate gears of an clrdinary Wahl totalizer and have twenty teet In order to provide for algebraic calcula tion there are two sets of dlals or numeral wheels, an upper set 63 for positive numbers and a lower set 64 for negative numbers, said wheels bein journaled respectively on cross rods 65 and 66. The individual dials may be of the usual Wahl construction except that the lower dials 64 have the numerals arranged thereon in an order the reverse of that used on the ordinary totalizer. Each of the dials 63 and 64 has a inion 67 mesh-V ing with one of the intermedlate gears 61, so that each of said ears drives two dials, one of each set of dials.

As is well known, the direction of rotaloo tion of the master wheel 46 can be reversed,

said wheel turning in the direction of the arrow in Fig. 3 for addition, and in reverse direction for subtraction. The reversal of this master wheel can be effected either manually or automatically, the automatic means including certain subtraction cams 68 mounted on the vertical totalizers 16 and dummies 17, and a follower roller 7() mounted on an arm 71 and normally pressed up by a spring but adapted to be vdepressed by said cams. In Fig. 1, the machine is shown arranged for work on a ledger sheet in which debit items are added into' the first totalizer 16 and into the cross totalizer 35; credit items are added into the second totalizer 16 and subtracted in the cross totalizer; the new balance is written in the' field defined by the left-hand dummy 17 and subtracted from the cross totalizer, and the old or pick-u balance ,is written in the column define by the right-hand dummy 17 and added into the cross totalizer. This arrangement is shown merely by way of illustration, as many other arrangements can be used.\ the amounts subtracted from the cross total.

It sometimes happens that izer exceed the amounts added in it. For example, if the machine is working on bank ledgerl sheets the depositor may check out more than he has on deposit; In that case the cross totalizer 35 should show an overdraft, and it is inorder that this overdraft may be represented by plain ligures that can be copied on to the paper inthe third column that an algebraic totalizer is desirable on this particular piece of work.

` l shall not go into any extended discussion of the principle of an algebraic totalizer, this being well understood, and the general principle of the particular one shown in the drawing is also well known, cross totalizers of construction similar in many respects to thepresent one being fully shown and described in certain rior patents of mine, such for example, as atent: 1,296,118 dated Mch. 4, 1919 and 1,801,818 dated Apr.

22, 1919, In some respects the present in-A vention maybe considered as in the nature of' an improvement on the cross footers shown in my prior patents and in other respects it may be considered an extension oi the invention set forth in said. patents,

said extension consisting in the addition-'tc' the cross totalizer of clearanceproof mechanism to be hereinafter described.' Suffice it to say for the present that so long as the total indicated on the totalizer 35 is positive it can `be read from the upper series of dials 63 and when said total is negative it can be read from the lower series of dials 64.

Algebraic totalizers are preferably provided with shutters and I have shown herein two such shutters. The shutter 72 'for the wheels 63 extends across the said series conceal thewheels and has also openings 73 adapted to yalign with the sight-o enings 7 4 in the casing plate 75 of the totarizer so as tofallow the wheels 63 to be read. The c lindrical part of the shutter is supporte by two end plates 76 pivotedc'i; the shaft 65. The othershutter 77 has similar sight-openings 73 adapted on occasion to align with the sight-,opening 78 for the wheels 64 and said shutter has end plates 80 pivoted on the shaft 66.

In order to shift the shutters 72 and 77 and in order to insert the fugitive 1 which it is necessary to add or subtract when the totalizer'passes throu h zero, a handle or lever 81 is provided. is pivoted on the shaft 62'and it projects from the front of the totalizer through a slot 82 in the .,casing. The construction is such that when this handle is moved from itsy upper to its lower position it shifts the shutters to'conceal the negative dials 64 and to eX ose the positive dial 63 and this motion o the lever also adds 1 (positive) into the totalizer; and when the handle is moved from its lower to its upper position it reverses the shutters and subtracts 1 in the totalizer. The precise construction of this lever can vbe varied but'as here shown the main part of it is made of sheet metal and it has mounted thereon a triangu' lar piece 84 which is rigidly connected with the lever 81 by means of three posts 85, 86 and 87, the first two forward-of the shaft 62 and the last behind said shaft, The piece`84, as well as piece-81, is pivotally his lever mounted on the shaft 62. The right-handvice versa. The sight-openings in the upper shutter 72 are in the lower or forward. part of the shutter and in the lower shutter 77 they are in the upper or rear part as shown.

The fugitive 1 is inserted by devices operated by the pin or post 87. The part .immediately operated by said post .is a struc-k ture including a hub 88, Fig. 2, journaled on the right-hand end of the rod 48. This hub has rigidly mounted thereon an outer plate 90 4and an inner plate 91 and it has va reduced part on which is loosely' pivoted athird plate 92.

The plates 90 and 91 are rigidly connected` at their lower parts by a post /93 having its ends reducedand riveted into said plates as shownin Fig. 2. The plate 9,1 has an arm extending upward and forward and bifurcated to uembrace the pin 87, tlus interlock ing this pivoted structure with the lever 81 vso that said structure rocks with the lever 81 but in the opposite direction. Said plate Y 91 also has an arm or nose 94 extending upward and rearward-and co-operating with a V-shaped point or nose 95 on a lever 96, which is ivoted on the frame rod 50 and is controlled) by one of the springs 57 and cooperates with one of the stop screws 54, the same as the ordinary transfer levers 48; but this lever 96 does not extend downward into position to be operated by the master dog 52. It is on the contrary operated by the nose 94 which is rounded for the purpose. The construction is such that the spring pressed lever 96 will retain said nose 94 and consequently7` the plates 91, etc.,and the hand 'e lever 81 in either of the two positions to which they can be set; but when force is ap lied to the lever 81 the lever 96 will yield and allow the parts to move to their alternative positions. l

The plate 92, which is loosely pivoted on l the hub 88, has two depending arms spaced apart as' shown andembracing the post 93 but with lost motion so that said plate 92 is obliged to partake ofthe swinging of the plates 91 and 90 but has a limited motion independently thereof. This plate 92 has a nose or cam part 97 which lies by the side of the-nose 94, the end ofsaid cam part being concentric with the shaft 43, and of a suitable length for the purpose about to be described. Co-operating with this nose 97 is a nose 98 formed on a plate 100 lying beside the lever 96 and riveted thereto at'101 and therefore constituting in effect a thickening of a part of said lever 96, the eifect being to thicken said lever so that its nose can co-operate not only with the part 94 but also with the part 97. Beginning with the parts in the position shown in Fig. 5, if the handle 81 be moved upward 'the noses 94 and 97 will move toward the front of the machine. The lever 96 will be cammed upward by the arm 94 but once elevated it will not immediately drop because the nose 98 will be held up by the cam dwell 97 until the lever. 81 has almost completed its motion, when the nose 98 will pass off of the dwell 97 and will cam the nose of plate 92 towards the front oi?` the machine. As this plate is loose on the hub it will move quickly and allow the lever 96 to be drawn down by the spring 57 with a snap. The construction shown in my prior Patent 1,301,318 has devices similar in principle to those just described and the function of said devices is explained in said patent.

It will be perceived that the relation of the lever 96 and the nose 94 is such that said lever 96 holds the plate 91 firmly at the limit of its motion in either direction.

In order to adder subtract 1 whenever the lever v81 is operated there is provided between the plate 91 and the units carrying wheel 45 a gear segment 102, Fig. 2, and this segment has two pins 103 projecting therefrom one on each side of the arm 94.- but spaced apart so that .the distance between them is greater than the width of said arm. When the handle 81 is in its lower position said arm 94 presses the rear in 103 firmly against a stationary pin 104, Figs. 5 and 6, projecting inward from the righthand frame plate 36 and thus holds the segment 102 in the position shown in Fig. 5. When the handle 81 is pulled upwardthe arm 94 moves toward the front of the machine and during the first part of its motion it does not operate the segment 102 but in the last part of its motion it engages the forward pin 103 and moves it toward the frontef the machine until arrested by another fixed pin or post 105, also projecting inward from theplate 36. Said arm 94 will be firmly held in this position by the lever 96. The segment 102 has on its upper part a series of gear teeth corresponding in position and pitch to some of the gear teeth of I the carrier gears 45 and the construction is such that an operation of the handle 81 moves said segment to the extent of one tooth, in positive direction when the handle is moved downward and in negative direction when the handle is moved upward. The motion of the segment 102 is communicated to the units wheel 45 by means of a Geneva pinion 106, Figs. 2 and 5, in all respects like the ordinary Vahl transfer pinions and mounted like them on one of the levers 48. This Geneva pinion has the usual scalloped middle part of greater diameter than the gear-toothed part land this enlarged scalloped portion is functionless except that it co-operates with the aligning bar 60 when `the pinion is raised out of engagement.

I have shown the algebraic totalizer 35 occupying the position of the cross totalizer in the lVahl mechanism. In the lVahl machine, thev cross-totalizcr is usually freed from the vertical totalizer in that step of the carriage which immediately follows the writing of the digit in the lowest denominational position, and said ttalizer is free of the master wheel 46 when it occupies its normal righthand or jump-back position. When the handle 81 is operated it operates thelowest register wheel and this' may result in carrying through to wheels of highest order. This handle should therefore never be operated when the totalizer is in engagement with the master wheel. To prevent it from ever being so operated I have provided means for locking the handle 81 except when the totalizer is in its'right-hand position free of the master wheel. To this end the plate 90, which it will be recalled is positively' connected with the handle 81, is prolonged soas to form a rear stop surface 107 and a front stop edge 108, and these surfaces or edges interlock with a flange 110 carrying lwheel 45 of neXt'lower order than the one engaged at the time by the master wheel.Y The flange 110 constitutes asort of continuation of the locking tooth 116 but at a lower level so that said flange does not lockthe carryinggears 45 but does prevent motion' of the plate 90 and consequently of the handle '81. The two stop surfaces 107 and 108 are so disposed that when the handle 81 is in its lower position the stop surface 107 will ride just 1n front of the iange 110-as shown in Fig. 5 and Ywhen said handle is in its upper position the edge 108 will ride just behind said flange as shown in broken lines in said figure. In either `event once the plate 90 gets into engagement withthe fiange 110, as it.does whenever .thetotalizer is in engagement with the master wheel, the handle 81 cannot be shifted. Said flange terminates at 118, Fig. 3, so that whenthe totalizer is in its right handf'position where it is out of engagement with the master wheel, the handle 81 is free to be operated. This locking mechanism isone ofthe novel features of the presenty in-l vention. A

' In order to notify the operator-when to shift thehandle 81 vI have made the highest register dials of peculiar construction. In some `prior algebraic totalizers it has been "deemed suilicient for this purpose merely to number said dials like any other dials, the

.o erator understanding that the highest dial s ould never show any number except 9 or zero, and that if said dial shows -zero the register will give t-he true reading, and if it shows 9, then it needs to be shifted to read from the other series of digits of opposite sign. In the present case I utilize the position of .the highest dial for the same purpose but make the change more conspicuous by using certain colors instead of the digits and I have also made this dial wider than` thefrest so as to make the spot of color still more conspicuous. This color scheme is dianietrically illustrated in Fig. 12 where 563!v represents the left-hand dial in the series 63,l` and.v 64 represents the corresponding dial'finthe lower series 64. In this diagram 74?in'dicates theupper sight opening and 78the lower sight opening. The upper dial 63 when thetotal ispositive shows a black spot 120 at the sight opening, and just above this is a red spot 121 which will be exposed when a number is` subtracted greater than the 'previous positive total. The balance of the circumference of the wheel 122 is colored green.- On the lower dial the red spot. 123

is beneath the black spotI 124 and the re mainder 125 of the circumference of thel wheel is colored green. The construction is such that when thereis a positive total on the register the red spot l123 should register` with `the sight opening; and when there is anegative total ,the black spot 124 should register with the sight opening. It will of course be understood that only one of the two sight openings at a time is uncovered. The whole construction is such that when the operator glances at thetotalizer and oh serves a black spot, he understands that the handle does not have to he shifted, but` if the ldial shows a red spot, then the handle should be shifted in order to read the correct total.V In case the dial shows green, this is an indication that the capacity of the register has been exceeded in one direction or the other; in other words, that the machine has been incorrectly operated. It will of.

course, be understood that black, red and green are given only as illustrations-any desired'colors can be used.- Preferably, however, the zero position of each dial is of the same color as the totalizer casing (Wahl totalizers are usually japanned black).` so

that, when the right set of dials are exposed to View, the highest dial is inconspicuous.. When the totalizer passes through zero, this dial changes to expose a spot of color (as red) contrasting with. the sur-v rounding parts and, therefore, adapted to attract attention.

These dials 63a and 64L are driven exactly like the other dials but it is not intended that they ever be operated except by a transfer from the next lower carrying wheel 45. The Geneva pinion that serves this wheel is therefore mounted on a special arm 126, Fig. 6, which does not have a down* ward extension adapted tol cov-operate .with the master dog 52.

It -will be understood that in the 4Wahl machine some of these arms 48 extend lower than others, as shown vin Fig. 5, and that where there is a long arm this resul-ts in looking the machine against operation in the next letter space position above that occupied, by said arm. The means whereby this locking takes place is well-known in the Wahl machine where the common use of itris to lock the machine against operation in thosff: letter space positions that are devoted to punctuation points. That lever 48 which stands'just to the right of thelever 126, may be made of the long kind so aste pnewent operation of the keys in the position occupied by the lever 126.,

Clearance .proof mechanism for an algebraic tot-alizer of the kindl herein described 'must of necessity diflerl from that which is applicable to an ordinary'totalizer, for the reason that positive zero and negative zero correspond to different positions of the gearing. When one of the dials 63 has its zero registering with the sight opening the corresponding dial 64 has the 9 registering with the sight opening and, vice versa, when one of the dials 64 has its zero on the reading line the corresponding dial 63 has a 9 on the reading line. What is the zero position of the gearing therefore depends on which set of dials is under consideration. In providing mechanism, such, for example, as feeler mechanism to test the state of the totalizer as to clear or not clear it is therefore necessary to provide some selective scheme to distinguish between the two kinds of zero. Mechanism having this selective power or property can be constructed in different ways but so far as I am aware the present is the first instance of any selective clear testing mechanism adapted to show clear whether the reading is from the positive numerals or from th nevative numerals. 1

n the specific form of the invention shown in the resent ease, the selective clear proof or c ear testing mechanism cooperates with the intermediate gears 61, which are for that reason provided with a number of teeth equal to some multiple of 10, 'twenty teeth being shown on each of these wheels in the present instance, Each of these wheels is provided with two short teeth' 127 opposite each other and therefore spaced ten teeth apart. When the computing train is at positive zero, one of these teeth 127 stands in the position shown in Fig. 10, and when the train is at negative zero it stands in the position shown in Fig. 9. If, therefore, a feeler, as 130, is to be used to test the state of this gear train it should, when a positive zero is under consideration, act toward the wheel 61 along the line 131, Fig. 9, whereas when the said feeler is to test the state of the gear train as to a negative total. it should act along the line 132. In the Wahl inzachine zero is' obtained by copying the total from the register wheels and substracting each digit from itself in the act of writing the digit. When copying a positive total the handle 81 would be in its depressed position, shown in Fig. 5, and at this time,

therefore, in order to test the clearance of the totalizer, the feeler should move up at the end of the operation along the line 131. When the total is negative the handle 81 would occupy its upper position, the gearing would be reversed so as-to enter the total positively into the machine, which would have the effect of subtracting it from itself as indicated on the dials 64. In order to test whether these dia-ls have come to zero the feeler should act along the line 132. I have accordingly provided a feeler 130 which is shifted by the handle 81 in such fashion that when the handle is in its lower or positive position the feeler acts along the line 131, and when the handle is in its upper position it acts along the line 132. Said feeler mayconsist of a series of arms but in the present instance I have shown it as a bar lying below the gears 61 and pivoted near its lower edge 'at 133 in two aims 134 and 135 fixed on theends of a rock shaft 136 which is pivoted at its ends in the frame plates 36. The feeler bar 130 has a convex edge which is pressed against the gears 61. In Fig. 11 I have shown part of the upper edge of this bar cut away at 137 to avoid interference with the dials 64, leaving, however` ribs 138 of cylindrical outline in position to contact with the gears 61.

The arm 135 is broadened out into a pla-te having the outline shown and a pin 140 projecting from the right-hand end of the feeler 130 plays in a slot 141 in said plate, the ends of which slot may limit the swinging motionof the feeler about its pivot 133. As best shown in Figs. 5 and 11, the plate-like inner end of the lever 81 extends down between the end of the feeler bar 130 and the plate 135 is made with a. slot 142 which embraces the pin 140 so that when the handle 81 is down in its positive position said feeler is swung to the position shown in Figs. 5 and 10 and in broken lines in Fig. 9, and when said handle is raised to.-its negative position said feeler block is swung over to the position ,shown in full lines in Fig. 9.

The cylindrical edge of the lfeeler bar 130 has its cylindrical axis at 143, Figs. 9 and l0, intermediate between the pivot 133 and the edge of the bar. The parts are so proportioned that when the handle 81 is in its positive position the point marked 143 a short tooth 127 is in the line 131, and if in the second instance said short tooth is in the line 132, then the feeler can move upward further than it can if a long tooth is in the line, and this additional upward motion indicates that the totalizer is at positive or negative zero as the case may be. The plate 135 and associated parts are shown in Fig. 10 by full lines in position to indicate a positiv-e zero and in broken lines in the positions they would occupy if one of the gears 61 `had. a long tooth in position to arrest the feeler, indicating that the corresponding dial was not at Zero.

This selective feeler mechanism can be made to lgive a clear or not clear indication in a variety of ways. ln thev present instance I have shown it co-operating with a clearancepproot mechanism which is fully shown, described and claimed in my pending application Serial No. 462,626, filed April 19, 1921.y The plate 135 has a 1in er 144 which overlies one arm of an ang ed lever 145 whichv may conveniently be pivoted on the post 105 hereinbefore described, which post isso constructed as that the part et it next the frame plate 36 acts as a pivot for said lever, and a prolongation Aof said vpost may yact as a stop for the pin 103,

as will be seen by reference to Fig. 2. The upward arm of the lever 145 has a pin 146 to whichis 'p'ivoted the forward end of a link 147, the rear end ot w-hich is pivoted at 148 to a lever or trigger 150, the lower end of which is pivoted on the frame rod 51just inside the frame plate 36. The pin 146 is prolonged inward, as shown in Fig. 6, and has connected thereto a light spring 151, the other end of which is connected to a fixed part, as for example, one of the bars 60, to normally pull the lever 145 clockwise in Figi 5 and to move the feeler 130 upward into engagement with the gears 61. The upper end Iof the lever or trigger 150 projects through the top of the casing 75 where a slot 152, Fig. 7 is made for the purpose, said s lot preventing motion of the lever in a. right and lefthand direction but allowing it a limitedl motion front and back.

It will be perceived that the whole construction is such that when the eeler 130 is in its elevated position, indicating that the totalizer is- 4clear, the lever 150 will occupy its rear position shown in full lines in Figs. 5Yand 10; and when said feeler is depressed, indicating that the totalizer is not clear, then said lever 150 will occupy the forward position shown by broken lines in Figs. 5 and 10. The trigger 150 co-operates with an arm 153 of a three-arm locking lever which is pivoted at 154 to a frame plate 155 secured4 to the end plate 24 of the stationary framework. The lever 153`eXtends left ward from the pivot 154 and at its free end has a'giooved pin 156 which plays in a slot 157' te prevent deliection of the lever arm front and back and which allows said lever arm to swing up and down. Near its free end said lever. arm has an inclined edge 158. This lever arm 153 is so situated that when the trigger 150 is in lits rear position indicating a clear totalizer its flat upper end is in the plane of said lever arm as indicated in Fig. 5, but when said. trigger occupies its forward position indicating not clear it is out of the plane of said lever arm. At certain times in the .operation Lof the machine said lever arm 153 drops downward and locks up the machine, as will be presently explained. It at this time the cross truck 18 and totalizer 35 make their jump to the right at the end of the column, then the upper end of trigger 150 will strike the. incline 158 and raise lever arm 153 to its unlocking position; whereas if the totalizer is not clear said trigger will not strike said lever arm and the machine will remain locked.

ln order to enable the locking lever to lock the machine it is provided with a depending` arm 160 having a lug 161 bent olf therefrom and adapted to engage the lever 27. When the locking lever is held up in its normal position shown in Fig. 1 it has no effect on this lever 27, but when it is dropped down to its locking position the lug 161 presses the lever 27 back against the plate 24 and locks up the machine precisely as the cross truck would if it were lleft in its right-hand position" when the main truck was in a computing column. The details of this locking mechanism are not here shown or described, -they being fully shown and described in the Wahl patent hereinbetore referred to. Moreover, any other suitable lock operated by this lever might be employed it preferred.

In order normally to hold the locking lever 153, 166 in its unlocking position and to release it to lock the machine at suitable times, said lever is provided with an upwardly extending arm 162 having a lug 163 bent rearward from its upper end and engaging a notch .in a latch lever 164, which latch lever is pivoted at 165 to the frame piece 155. A tension spring 166 connects the arm 162 with a depending arm otthe latch lever 164, this spring performing the double function of normally holding the latch lever in engagement with the lug 163 and, when said latch lever is unlatehed, ot moving the locking lever 153, 160 to locking position.

ln order to release the latch lever 164 at certain times said lever is provided with an upright arm adapted to he pushed tothe right by a long wire 16T which is guided in a hole in an ear 168 bent oit from the frame plate 155. This wire or push bar 167 extends leftward t0 the middle of the machine where its left-hand end is pivoted 'a flanged plate 172 secured to the casting or trame bar 15 by screws 173. The lever 170 ice is in the nature of, a bell crank which in order to secure a long pivot, is formed as shown in Fig. 1 sol as totake a bearing both at the upper end and at the lower end of the post 171 and said bell crank has a leftwardly directed arm 174 toV which a dog 175 is pivoted at 176. Said dog has a pin 177 projecting therefrom and .engaging the edge of lever arm 174 soas to limit the rotation of said dog about its pivot 176 vin one direction. Said pin is normally pressed against said lever arm by means of a spring 178.-

The do 175 and the lever 174, 170 are operatedl y means of a tappet 180 consisting of a flange bent off from the end of a bracket 181 secured to and projecting toward the right from the second or left-hand one of the two dummies 17, said flange or tappet 180 engaging an inclined edge of the dog 175'as shown in Fig. 4. The construction is such that when the carriage is moving toward the right trappet 180 will engage the abrupt edge of the dog 175 and rock said dog idly about its pivot, the d og being restored to normal position by its spring 178 after the tappet has passed it; but when the carriage is traveling towards the left said dog cannot rock in that direction on account of its stop pin 177, and the tappetengaging the inclined edge of the dog will rock the lever 174,170 against the tension of a restoring spring 182 and push the wire or bar 167 toward the right, releasing the locking lever 153, 160 and locking up the machine. In the present instance the parts are so arranged and proportioned that the locking lever 153 is thus tripped off during that step of the carriage which immediately follows the writing of the last digit in the calculatin column controlled byv the lefthand dummy 17. It will be recalled that in the particular machine arranged in the particular manner shown in the drawing it is at this time that the cross totalizer 35 should have just come to zero, due to the copying lout of it of the new balance which had been .computed in it. In this same letter space step of the carriage, the -hook 20 is cammed loose from the dummy and the cross totalizer makes its jump to theriglit. If the work has been correctly done and the cross totalizer is clear as it should be, then the lever 153 will drop to locking position and will almost instantly be restored by the trigger 150; but if the work has been incorrectly done and the totalizer has not been cleared, then said trigger' 150 will not engage the lever 153 andthe machine will remain locked and the operator will thus be notified that a mistake has been made.

What I claim as new and desire to secure by Letters Patent, is

1. The combination with register wheels, of means for testing the position of said wheels, comprising a feeler pivoted to swing about an axis 133 remote from said wheels and having its feeling surface in the form of part of acylinder whose axis 143 is between the pivot 133 and said wheels, whereby said feeler can be swung about its pivot 133 to bring said axis 143 into di'erent planes radial of said wheels, said feeler being bodily movable toward and from said wheels.

2. In an algebraic calculating machine, the combination with register wheels having positive and negative numerals, a handle, shutter mechanism operated by said handle to display a positive or a negative total as the case may be, and lmeans operated by said handle to insert the fugitive 1, of clearance proof mechanism settable by said handle to test for positive or negative zero as the case may be.

3. In a calculating machine, the combination with algebraic calculating mechanism, of a lock to indicate not clear, and means for controllingsaid lock selectively as to positive and negative clearance.

4. The combination with register wheels capable of giving positive and negative totals, of clearance proof mechanism, and

hand operated means for at will setting said mechanism to prove positive zero and to provide negative zero.

5. The combination with register wheels and two sets of dials, one set for positive totals and the other set for negative totals, of a handle, movable to two positions, shutterA mechanism operated by said handle, means operated by said handle for inserting the fugitive 1, and clearance proof. I

mechanism shiftable by said handle.

6. The combination with register wheels, of a. movable frame, a feeler pivotallyl mounted in said frame, means for moving said frame to press said feeler against said wheels, and means for shifting said feeler about its piv'ot in said frame to change the points on said wheels at which said feeler enga-ges said wheels.

7. In an algebraic calculating machine, the combination with register wheels and a master wheel having relative travel, of hand o erated means for inserting the fugitive 1 and a. locking bar bearing a fixed relation to said master wheel and preventing operation of said hand-operated means when any of said register wheels is in engagement with said master wheel.

8.' The combination with an algebraic totalizer and a master Wheel having relative travel, of a handleA in said totalizer for inserting the fugitive 1, and a lock for preventing operation of said handle when said vout of engagement but being adapted to be reciprocated one across the other a plurality of times for a single traverse of said carriage, of a device in said totalizer shiftable for a positive total and for a negative total, and a locking bar to prevent the shifting of said device except when the totalizer and master wheel are in their normal disengaged relative positions.

11. In algebraic calculating mechanism, a dial and means for operating said dial, said dial showing one color when the mechanism stands at a positive total, another color when said mechanism stands at a negative total, and a third color when the capacity of said mechanism has' been exceeded.

12. In algebraic calculating .mechanism having a casing, a dial and means for operating said dia said dial showing the same color as said casing when the mechanism stands at a total of one sign, said dial showing a contrasting color when said mecha@ nism stands at a total of the opposite sign, and said dial when the ca acit of said mechanism `has been excee ed s owing a third color contrasting with both first mentioned colors.

13. In an al ebraic totalizer having two sets of numera s, one for positive andthe other for negative totals, an indicator adapted to display three colors, one color indicatrectly operated.

ing that the total may be read from one of said sets of numerals, a second color to indicate Ithat the total shouldvbe read from the other set of numerals, and a third color to show that the totalizer has been incorl rectly operated.

14. In an algebraic totalizer, the combination with two sets of numerals, one for positive andthe other for negative totals, and shutter mechanism to display said sets of numerals alternatively, of an -indicator adapted to display three colors, one color indicating that the total may be read as displayed, another color to indicate that said shutter mechanism should be shifted, and a third color to indicate that the totalizer has been incorrectly operated.

15. In an algebraic totalizer, the combination with two sets of dials,- one set to show positive totals and the other set to show negative totals, and shutter mechanism to display said dials one set at a time, of two indicators, one associated with each of said sets of dials and each adapted to display three colors, one color toindicate that the total may be read as then displayed, another color to indicate that said shutter mechanism should be shifted, and a third color to indicate that the totalizer has been 'incor- 16. In an algebraic totalizer, the combination with a` set of numeral dials, of anadditional' dial connected by carrying mechanism to the dial of next lower order and having its zero position one color,.its nine position a second color, and the balance of its exposed surface a third color. Signed at borough of Manhattan, cityv o New York, in the county of New York, and State of New York, this 6th day of Janu-v ary, A. D. 1922.

ARTHUR F. POOLE.

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