US2557804A - Means for adapting decimal accumulators to nondecimal systems of notation - Google Patents

Description

June 19, 1951 R. H. STROTHER 2,557,804

MEANS FOR ADAPTING DECIMAL ACCUMULATORS TO NONDECIMAL SYSTEMS OF NOTATION Filed June 22, 1949 4 Sheets-Sheet 1 ,1oa INVENTOR.

ROBERT H. STROTHER JLL ATTCRNEY STROTHER MEANS FOR ADAPTING DECIMAL ACCUMULATORS TO June 19, 1951 R. H.

NONDECIMAL SYSTEMS OF NOTATION 4 Sheds-Sheet 3 Filed June 22, 1949 INVENTOR.

ROBERT H. STROTHER ATTORNEY June 19, 1951 R. H. STROTHER MEANS FOR ADAPTING DECIMAL ACCUMULATORS TO NONDECIMAL SYSTEMS 0F NOTATION 4 Sheets-Sheet 4 Filed June 22, 1949 INVENTOR. ROBERT H. STROTHER BY 21% A QUE ATTORNEY Patented June 19, 1951 MEANS FOR ADAPTING DECIMAL ACCUMU- LATORS TO NONDECIMAL SYSTEMS OF NOTATION Robert H. Strother, Brooklyn, N. Y., assignor to Remington Rand Inc., New York, N. Y., a colporation of Delaware Application J one 22, 1949, Serial No. 100,682

4 Claims.

This invention relates generally to accounting machines and more particularly to acumulators for such machines, especially those capable of accumulating amounts according to a plurality of number systems.

The principal purpose of the invention is to adapt accumulators of a certain type which ordinarily handle numbers according to one system of notation to add and subtract numbers in another system of notation, usually, to adapt a decimal accumulator to adding and subtracting also non-decimal fractions. In some prior machines the non-decimal wheels have been made of the same pitch diameter as the decimal wheels but divided circumferentially into twelfths or eighths or whatever the fraction may be, thus bringing the teeth of said fractional wheels closer together or farther apart, or, in other words, changing their diametral pitch. This made it necessary to change the pitch of the actuating rack which again necessitated changing the stops for controlling said rack. Thus adding a fraction wheel to a decimal accumulator necessitated making considerable changes in the means for actuating the wheels. According to the present invention the fraction Wheels are made of substantially the same diametral pitch as the decimal wheels, thus obviating the necessity for changing the actuating mechanism.

This makes the fraction wheels larger or smaller than the decimal wheels which calls for changes in the manner in which these wheels are journaled in the accumulator.

Moreover the angular spacing of the nondecimal wheel is different from that of the decimal wheels, the teeth being spaced 36 apart in a ten-tooth wheel, 30 apart in a twelve-tooth wheel, 45 apart in an eight-tooth wheel, etc. This presents a problem in bringing the teeth of the wheels into proper angular positions for engagement with their racks in shifting between addition and subtraction. The accumulator and its racks are built primarily for ten-tooth wheels, and when a non-decimal unit is added and so set as to engage itsrack properly in subtraction the teeth will, unless provision is made to the contrary, not come at the right angle for proper engagement with the racks when shifted to addition. The invention includes means to overcome this.

One of the purposes had in mind in the invention has been, when adding fraction wheels to the accumulator, to confine the necessary changes as far as possible to the accumulator itself, with no change at all or none but very simple ones in the rest of the machine.

One object of the invention is to so construct the fractional denomination of the accumulator that it can receive a tens carry from another. denomination as well as transmit one to the next order to the left, so that the fractional section oi the accumulator not necessarily the extreme right hand section, but may be located anywhere desired in the accumulator. Also, where it is the extreme right har section, it may receive a carry from the wheel of highest order so as to add or subtract the fugitive one and thus preserve the so called algebraic feature of the accumulator. This also enables the use of more than one fractional Wheel in an accumulator. 'ihus, if the fraction is twelfths the last two sections may be for adding twelfths, thus enabling the addition and subtraction of gross, dozens, and twelfth dozens. Also, by putting two carry teeth on each twelve-tooth wheel, this section will add siizths, and if made the second wheel of. the accumulator it will add sixtieths in order, for example, to add workmens time in hours and minutes.

The fact that by the present invention the fractional section or sections may be placed wherever desired in the accumulator, and that more than one of them can be used in the same accumulator, adds importance to the making of the fraction Wheels of the same pitch as the decimal wheels, andconfining the adaption of the accumulator to fractions almost exclusively to the accumulator itself.

One machine in which the difficulty of changing the actuating mechanism is great, is the tabulator disclosed in the patent to W. W. Lasker and John Mueller, 2,323,816, and the patent to John Mueller, 2,381,361, and it has long been desired to enable certain denominational orders of the accumulators of this machine to handle fractional amounts, for example, twelfths, so as to condition. the machine for accumulating British currency or amounts in dozens and twelfth dozens.

For purpose of illustration and description the invention is disclosed as applied to the Lasker and Iviueller machine, but it is to be understood that the invention is applicable not only to other decimal accumulators, but also to accumulators for accumulating amounts according to other number systems.

One object of the invention is to provide means whereby the ordinary wheels in one or more denominational orders of an accumulator can be replaced by wheels having a greater number of teeth of the same pitch.

Another object of the invention is to so construct said means as to enable a common setting member to move the unlike wheels through difierent angular distances in setting the accumulator for subtraction or addition, so as to bring all of the wheels into. their proper positions relative to the actuators.

Still another object of the invention is to so parallel movement wheel carriers, and providing one of the latter carriers with an eccentric connection to the common operating member, whereby the wheels supported by said carrier and its associate are moved through different angular distances than the wheels carried by the parallel carriers in setting the accumulator for addition or subtraction.

In the drawing:

Fig. l is a right hand elevation of the known accumulator with fragments of the mechanism for operating it;

Fig. 2 is a partially diagrammatic fragmentary view of one denominational order of the known accumulator, and which in conjunction with Fig. 3 serves to illustrate certain differences in the movements of the known mechanism and the mechanism of the invention;

Fig. 3 is a partially diagrammatic fragmentary view of a denominational order of the known accumulator to which the principles of the inven- I tion have been applied;

Fig. l is a sectional View from the right illustrating the known mechanism in the highest order of the accumulator and the manner in which said mechanism is modified in accordance with the invention;

Fig. 5 is a fragmentary sectional view from the right, illustrating the mechanism of the invention in the units order of the accumulator with the accumulator set for subtraction and with certain of the known mechanism in tens order shown in dotted lines to emphasize the differences in the two mechanisms;

Fig. 6 is a view similar to Fig. 5 but on a larger scale and with the accumulator set for addition, the mechanism in tens order being shown more full and emphasized by cross-hatching in this figure; and

Fig. '7 is an isometric view on a large scale showing the construction of part of the mechanism of the invention.

' The accumulator to which the invention is here shown applied is substantially identical with that disclosed in the above cited patents, and will be described along with certain of the mechanism for operating it, before entering into a detailed description of the improvements.

The accumulator has a stationary frame comprising right (nearest the observer in Fig. l) and left hand frame plates I90 rigidly connected together by bolts IIlI. A shaft Hi2 passing through said plates has a bell-crank I93 fast on its right hand end, and a similar bell-crank fast on its left hand end (Fig. 4). Journaled in the upstanding arms of said bell-cranks are the ends of a rod it constituting the pivot of a rocker operatively identical with the one shown in the patents, but of differently detailed construction. Said rocker comprises two end pieces I05, one inside each of the bell-cranks Hi3 and upper and lower pivot rods I06 mounted in the end pieces I05. On the upper rod I06 there are pivoted the right and left hand side plates I07 of an auxiliary frame, which also includes cross members I08. A similar frame butupside down of the first, has its 4; side plates II pivoted on the lower rod I06. Near their rear ends the upper and lower side plates Ill'i' (both right and left hand) are loosely connected by a link III) pivoted to the plates at III. The links I Iii are parallel to the end pieces I 5, and the pivots III of the former are the same distance apart as the pivot rods I96 of the latter. The upper and lower auxiliary frames are, therefore, connected together into a linkage which is in the form of, and, in efiect, is a parallelogram, Each of the links IIG has a trunnion M2 by which it is pivoted to a supporting link I53 pivoted at lit to the stationary frame plate Iflil, this link H3 being parallel with and equal in length to the upstanding arms of the bellcranks IE3. The construction is such that the upper and lower auxiliary frames can be moved in opposite but parallel directions from their add position shown in Fig. 1 where the lower frame projects further rearward to their subtract position (see Fig. 5) and where the upper frame rather than the lower projects further rearward (rightward in Fig. 1) by rocking the rocker I04, Hi5 about its pivot; and, in whichever of their two relative positions the frames are, both can be moved bodily rearward together by swinging the bell-cranks I93 clockwise and carrying the links H3 with them. In Fig. 1 the accumulator is shown set foraddition with the lower frame I01 set further rearward. It it is desired to subtract a number the rocker I63, will first be rocked clockwise about its pivot to project the upper frame toward the racks H5 and to withdraw the lower frame, and then both frames will be moved together by swinging the bell-cranks I233 so as to bring the upper register wheels into mesh with the racks.

The accumulator comprises a suitable number of upper subtract wheels i It and lower add wheels ill constantly in mesh as shown in Fig. 2. Each of the wheels is mounted on the rearward end of a lever or carrier H8, said levers being pivoted on the rods I66 where they are spaced apart by spacing washers. The construction is such that when the rocker EM, I05, is rocked, the carriers Sit and wheels H6 and III will partake of the relative fore and aft movement of the frames IIII.

In each denomination the two carriers IIS are connected together by a link I29 pivoted at I2I and I22 to the carriers. Link I29 is parallel with the links IIS and end pieces I65, and its pivots IZI and I22 are the same distance apart as the rods H16. This link I29 causes the register wheels, when they are relatively shifted for addition and subtraction, to roll one on the other, their axes being maintained at all times at a uniform distance apart.

In order to effect the transfer of tens each pair of carriers H3 is moved upward at its rearward end (Fig. 2) to the extent of one tooth space, the wheel H6 or II? which is at that time in mesh with the rack rolling on said rack.

To this end each upper carrier I I8 is extended upward at its rearward end and is guided in a comb formed on one of the cross frame plates I98 (Fig. 4) and the reverse construction applies to each lower carrier IE8. In the normal position of the parts a shoulder I23 on the lower carrier IIS rests on the upper edge of a cross frame plate I88, and a similar shoulder I24 in the upper carrier I IS stands below another frame plate Its a distance equal to one tooth space of the rack H5. The carriers are at the proper times put under spring tension tending to rock 5. them counter-clockwise, but are normally held down by latches which are tripped by the wheels of next lower order passing from 9 to 0. In all of these movements the two carriers are constrainedto move in harmony by their connecting link I20. When the parts are set for addition as in Fig. l, shouldered notches I29 in the lower carriers Ill; are engaged by transfer latches I25 pivoted on a cross rod IZE mounted in the auxiliary frames Ii 'l, said latches having springs I21. Each latch is connected by a link 328 with a bell-crank transfer pawl I353 pivoted to the lower carrier HS in position to be operated by a carry tooth I3I on the appropriate register wheel H1. The construction is such that during addition on the down stroke of the racks, when one of these wheels turns from 9 to the tooth I3I rocks the pawl I38 and withdraws the latch I25 for the next higher pair of carriers. In total taking, where the total is positive the carry pawl I36 arrests the counter-clockwise rotation of the wheel at zero.

The transfer mechanism used in subtraction cooperates with the upper register wheels IIE, and comprises in each denomination a latch I32 spring pressed into engagement with a shouldered notch H33 in the upper carrier H3, and withdrawn by a link I35 connected to a bellcrank transfer pawl I35 pivoted to the carrier and adapted to cooperate with the transfer tooth I36 on the register wheel. Each link I2ii has at either end a nose l3? adapted to cooperate cam fashion with inclined shoulders on the proximate edges of the lower and upper transfer pawls I39 and I35 in suchwise that, when the parts are set for addition, the upper nose I3! forces the pawl I35 upward away from the wheel and pulls the latch I32 out of engagement, leaving the transfer mechanism entirely under control of the lower wheels. When the parts are set for subtraction the link I20 rocks about its two pivots and the upper nose i3l allows the upper transfer pawl to drop down to operative position, whereas the lower nose I3! cams the transfer pawl I3t downward to inactive position, withdrawing latch I25 from engagement. This leaves the transfer entirely under control of the upper wheels.

In the upper set of transfer devices, the latch I32 in lowest order and a similar device I33 operated by the pawl I3 of highest order are made in the form of bell-cranks whose horizontal arms engage open ended slots in the arms of a yoke or bail MI pivoted to the frame plates is"! at I42. The construction is such that, when the highest order wheel passes from 9 to 0, its pawl I35 rocks bell-crank I38 and, thereby, bail MI which draws the latch I32 from the lowest order lever I I8, permitting the units wheel I IE to move upward and subtract the fugitive one. Similar fugitive one devices are included in the lower transfer devices, and negative totals are, therefore, registered in their true amounts.

In order at the proper time to place the carriers I I8 under spring tension to predispose them to transferring operations, each upper carrier is prolonged forward of its pivot I56 (Fig. 4) and has pivoted thereto at I43 a bell-crank I44 whose depending arm is connected by a spring I45 with the forward end of carrier H8, tending to rock said bell-crank clock ise until arrested by an ear I46 formed on the carrier. It will be perceived that if the forward end of said bell-crank be pressed down, the spring I45 will tend to rock the carriers I I8 counter-clockwise, but if the forward end of the bell-crank be allowed to rise until arrested by ear I 45 this tendency disappears. The forward end of each said bell-crank carries a roller Id? lying beneath a cross bar I48 (Fig. l) which, as described in the aforementioned patents, is normally in its upper position but is moved down, and remains down substantially during the time the totalizers are in mesh with the racks in computing operations.

In order to move the totalizers into and out of mesh with the racks and to shift the accumulator for addition or subtraction the right hand (nearest the observer in Fig. 1) upper and lower auxiliary frame plates Iil'l have pivoted thereto at I58 an upper push link I5! and a lower push link I52, respectively. For safety reasons these links are made up of two pieces connected by pins and slots and drawn in opposite directions by a spring I53. Normally the upper link rests on a lug of the lower link to which it is connected by a spring I54, but, on occasion, the two links are spread apart. The upper link is made with a shoulder I and the lower link with a shoulder I56 for alternative engagement by a pin l5! carried between the two members of a compound arm E58 fast on a transverse rock shaft I59; As described in the aforementioned patents, shaft Icd is rocked counter-clockwise at suitable times to engage the accumulator with the racks, pin I57 acting on the shoulder I56 for addition and on shoulder I55 for subtraction. If, as also described in said patents, the links led and I5! be swung downward for subtraction, then when the shaft IE9 is rocked, the first part of its motion will consist in pushing the links IEI and the upper frame plates Ill? rearward, rocking the rocker Hi l clockwise about its pivot, thus advancing the upper wheels I It and withdrawing the lower ones ii"! so that the actuation will be by the former wheels. In this movement the relative motion of the upper and lower frame plates is limited by two lugs ItI projecting downward from the upper frame plate I87, and another lug I82 projecting upward from the lower frame plate Illl.

Referring to Figs. 1 and 4, the register wheels when disengaged are held against turning by detents I63 consisting of long levers each pivoted at I554. to the appropriate carrier I I8 and pressed by a spring I against the upper wheel I I6. At the time when the wheels are shifted between addition and subtraction, therefore, the upper wheels are held against rotation and the lower wheels roll under them. As soon as the relative motion of the auxiliary frames Iii! is completed, the further rocking of the pin I57 forces them to move rearward togther.

Beginning with the parts in the position shown in Fig. 1, if the operation is one of addition, the pin I5"! will move idly up to the shoulder I56, and its additional movement will cause the totalizer to engage the racks.

At the proper time the shaft is rocked clockwise to normal position, whereupon the totalizer is withdrawn from the racks by means of a spring I56 connected to the left hand bellcrank I03 (Fig. 4).

In order to release the detents I63 when the totalizer moves into engagement with the racks, each detent has a forwardly directed arm lying beneath and some distance from a bail bar I61 whose arms IfiB are fastened on a rock shaft Ilfl journaled in upwardly extending ears of the upper auxiliary plates IQ'I. The left hand arm I63 is extended forwardly from its pivot, and is connected by a link III with the horizontal arm ofthe left hand bell-crank I63 (Fig. 4.); As this bell-crank moves clockwise in Fig. 4, to move the wheels into engagement, it rocks the bail bar I61 downward and at the last part of this movement said bail bar strikes the detent levers I53 and moves them out of engagement with the pinions. They are moved. into engagement at the first part of the return motion of the totalizer.

All of the mechanism thus far described is substantially identical with that shown in the hereinbefore mentioned patents. However, before going on to a description of the changes made in said mechanism by the present invention, it is deemed desirable first to explain certain features of the old mechanism in a manner which it is expected will be beneficial to an understanding of the invention.

In Fig. 2, certain diagrammatic lines have been added to illustrate the angles and certain linear distances through which the various parts of the accumulator are moved by the motion of rocker Ice, IE in shifting from the add position to the subtract position. Angle A is the one through which the rocker I04, I85 is rocked, and in the illustrated accumulator is 54, that is to say, 27 either side of a vertical through the center of pivot Iil i. As described hereinbefore, the distance between the centers of pivots I06 is equal to the distance between the centers of wheels H6 and Ill, and, therefore, a line passing through the centers of said wheels and pivoting about the point of tangency or" their pitch circles, will, by the movement of rocker It, generate an angle equal to angle A. Thus, in the add position the wheels stand 27 counter-clockwise of vertical and in shifting to subtract positions rocle clockwise 27 beyond vertical. And the opposite is true when shifting from subtract to add position.

Normally the upper wheel H6 is held by its detent with a tooth pointing along the horizontal axis thereof toward the rack, said tooth, because of the relative vertical positions of the rack and the accumulator, pointing into a notch of the former. Remembering that the upper wheel HE is held against rotation by its detent with two of its opposite teeth standing horizontally, when shifting to addition the lower wheel rolls on the upper one and at 27 from the vertical two of its teeth will also stand in horizontal alignment this being due to the fact that the teeth are 36 apart. Also, when the wheels stand in these relative positions as shown in Fig. 2, the axis of the lower wheel is at a distance below that of the upper wheel, nearly equal to three tooth spaces of the rack. In the manufactured machine, the wheels are made slightly oversize so as to make this distance just equal to three rack teeth. In shifting back to subtract position the lower wheel rolls on the upper the same distance, but in the opposite direction. It is evident that if rocker Hi l, I65 and, therefore, wheels HS and III are rocked relative to vertical some angle other than 5l the teeth of these ten-tooth wheels will not be brought into the desired relation with the rack. Therefore, in adapting one of the orders of this accumulator to the accumulation of twelfths the amount of rocking movement of the rocker Id i,

I85 cannot be altered.

In Fig. 2, B denotes the linear distance through which the carriers are moved to brin the wheels to the proper position relative to the rack.

In those orders in which it is desired to ac cumulate tweliths, in the present instance the right hand or units order, the ten-tooth wheels are replaced with upper and lower, intermeshing twelve-tooth wheels I75 and H6 (Fig. 3) of the same pitch, and the parts concerned with the positioning of said wheels are modified to position them correctly relative to their actuators.

The twelve-tooth wheels are supported by carriers Ill Figs. 3, 5, and 6) which unlike the ten-tooth wheel carriers are not elements of a parallel linkage. At its forward end the lower carrier III is pivoted in the preferred construction on the same rod Ilia as the ten-tooth wheel carriers, but the upper carrier Ill is pivoted on an eccentric sleeve I'IS mounted on the upper rod I66 and fixed to rock on said rod in unison with and through the same angles as the rocker Iil i, H35, that is to say, 54 (Fig. 2 In the present instance the sleeve is journaled on the upper rod I65 and is welded or otherwise fastened to a fixture I19 (see also Fig. 7) which extends around the pivot Ifiil and has its lower end loosely mounted on the lower rod I66. Thus the eccentric is constrained to rock with rocker I04, I and in so doing moves the upper carrier Ill a greater distance than the lower one is moved. The amount of eccentri ity of sleeve H8 is, of course, dependent on the amount of movement it is desired to impart to the upper carrier over and above the amount which the lower carrier is moved, which is the same as that through which the ten-tooth wheel carriers are moved.

Just forward of the wheels I25 and N6 the two carriers are connected by a link E88 whose pivots ISI and I82 are spaced apart a distance sufficient to maintain said wheels in their correct meshing relation with one another.

In the present instance the distance between the centers I83 and I8 1 of the wheels is greater than the distance between the centers of eccentric I78 and lower rod I86, which results in that the pivots 823i and IE2 are spaced apart a distance somewhere between the two but equal to neither.

The lower carrier III is provided with a shoulder It?) (Figs. 3, 5, and 8) like the shoulder I23 (Fig. 2) of a lower ten-tooth wheel carrier H8 and, like the latter, rests on the lower cross frame bar IE8 to support the upper and lower carriers. However, the pivot I35 of the lower twelve-tooth wheel is situated lower than the pivot I8? of a ten-tooth wheel a distance appropriate to locate the center I83 of the upper twelve-tooth wheel in horizontal alignment with the center I86 (Fig. 5) of the adjacent upper ten-toothed wheel and, therefore, in horizontal alignment with the middle of a notch in the rack when the accumulator is set for subtraction, and to locate the center I84 of the lower twelve-tooth wheel one half tooth space of the rack below the center I8? of the adjacent lower ten-tooth wheel (Fig. 6) and, therefore in horizontal alignment with a tooth of the rack when the accumulator is set for addition. The centers I83 and We of the twelve-tooth wheels are, of course, situated a short distance further away from the racks than the centers I86 and IE7 of the ten-tooth wheels because of the greater diameter of the former wheels.

It will be remembered that in the ten-tooth section of the accumulator a tooth of the upper and a tooth of the lower wheel point horizontal- 1y into notches of the rack, the lower notch being three below the, upper one. The upper twelve-tooth wheel is held by its detent with a tooth pointing-horizontally toward the rack, and; when the accumulator is set for subtraction, pointing into the same notch of the rack as the horizontal tooth o f-a ten-tooth wheel. The teeth of the twelvetooth wheels are spaced 30 apart which results in that, in'the add position of the accumulator, if. the wheels are positioned 3G counter-clockwise of; vertical, a line connecting the centers of said wheels bisects a tooth of the upper wheel and the notch f the lows wheel withwhich said tooth meshing s. 3; and 6) and moving around the lower wheel, a notch thereof if aligned horizontallywith tool of the rack immediately below the notch. engaged by the horizontal tooth of the adjacent lower ten tooth wheel.

Withthe wheels in the add position (Fig. 6) it willbe noted that center I83 of the upper twelvetoothwheel ispositioned a short distance below that of the adjacent-ten-tooth wheel, whichresults in that the horizontal tooth of the former does-not point into the appropriate notch of the rack. This, however, is of no consequence as the upper wheel, when in add position, never engages the rack; and the same holds true for the lower wheel when the wheels are set for subtrac tion, that is to say, when the accumulator is set for subtraction (Fig. a notch of the lower wheel does not point horizontaily at a tooth of the rack, which again is of no consequence as the wheel does not engage. the rack in this position.

In shifting the accumulator from its add position to its subtract position, the upper twelvetooth wheel rocks from its 30 counter-olockwise of vertical position, clockwise beyond vertical to a position where its horizontal tooth is aligned horizontally with a. notch of the and sit uated the proper linear distance from the rack. In the present instance, the upper wheel moves to a position 23 25' clockwise or vertical. in Fig. 3, B denotes the distance which the upper carrier is moved, such distance being greater than distance B (Fig. 2) an amount suiiicient to bring the upper twelve-tooth wheelinto the proper position relative to the rack when in subtract position, and in add position tobring its center 30 counter-clockwise from the vertical. The lower twelve-tooth wheel carrier is moved the same distance as a ten-tooth carrier. The angle A generated by a line-through the centers of lower rod IElE and. eccentric I is is, of course equal to 54, the same as angle-A- (Fig. 2). is evident, therefore, that the amount of eccentricity of sleeve I'IB is so designed as to cause the rocking of rocker Hi4, its through, in the present instance, an angle of 54 to move upper car rier the proper linear distance and, therefore, the wheels I and I15 through an angle of 53 26. It will be understood, however, that other instances the angles through which the rocker moves or the linear distance through which it is desired to move the upper carrier would difier and, therefore, the amount of eccentricity of sleeve I78 would differ accordingly.

It is believed evident from the foreg that more than one twelve-tooth section he inserted in an accumulator and that the twelve tooth wheels are actuated by rac bars identical with those which actuate the t th wheels. In fact, the same racks used for toth wheels can, by shifting the accumulator later ally as described in the aforementioned patents, be used for twelve-tooth wheels.

The detent I88 for the upper twelve-tooth wheel I15 is like and operates in the same. man ner as the detent I63 for a ten-tooth wheel H5.

The transfer mechanism associated with, the twelve-tooth wheels has been modifiedsomewhat in a manner presently to he described from that described hereinbefore with reference to the tentooth wheels.

The upper carrier IT! is provided a shoulder let which, by engaging the upper frame bar 503, limits the upward movement of the carriers in transfer operations. Shoulder E39 is made on two levels connected by an incline and so situated as to allow the carriers to move upward a distance sufficient to rotate the associate wheels one tooth space, whether the upper carrier is in its lower add position (Fig. 6) or in its higher subtract position (Fig. 5) at the time. The frame bar I38, it will be remembered, shifts through the same distances as the ten-tooth wheel carriers and relative movement occurs between shoulder I98 and said bar due to the action of eccentric IIE? in moving the upper twelve-tooth carrier a greater distance, as is apparent from Fig. 6 where a ten-tooth section is shaded in behind a twelvetooth section.

When the carriers are in subtract position (Fig. 5) the lower level of shoulder I90 engages the bar I08, but, when the parts are shifted to add position (Fig. 6) the upper carrier is positioned lower an amount equal to the vertical distance between the center I 83 of the upper twelve-tooth wheel and the center I86 of the adjacent tentooth wheel, and the upper level of shoulder I99, is made to engage said bar when a carry occurs so as to limit the rotation of the, twelve-tooth wheels to one-tooth space.

In the subtract position the carriers are held against transfer movements by a latch I9I which engages a notch I92 in the upper carrier. In case the twelve-tooth section is the right hand or units one the latch I9I is provided with a horizontal arm I93 operable by the fugitive I bail II to withdraw said latch and free the carriers. As described hereinbefore, this bail is at its other end connected by bell-crank I 38, and link I 3-? (Fig. 4) with the transfer pawl I35 which engages the highest order wheel II 6, and when said pawl is cammed upward either by the carry tooth of said wheel or by the nose I31 of the associate link I29, said bail is rocked and withdraws the latch ISI (Fig. 5). A similar set of devices (Fig. 6) is provided for controlling the carriers ITI when the accumulator is set for addition. However, the lower latch MI is shortened to avoid any possibility ofinterference with the lower carry pawl I95 which itself is appreciably lower in the machine, than the corresponding pawl of a ten-tooth section.

In shifting from subtract to add position the twelve-tooth wheel carrier I I1 and, therefore, notch I92, move forward a greater distance than their ten-tooth counter parts which results in that the latch I9I which is controlled by the nose I31 of a link I20 in a ten-tooth section must also be moved a greater distance than a ten-tooth latch to prevent the former from being reengaged with notch I 92 when the carrier reaches its add position. To this end, the nose I31 of the link I 29 controlling said latch is elongated to withdraw said latch a greater distance. It will be understood that Whereas in the present instance it is the nose I3! of the highest order link I29 that is elongated due to the positioning of the twelve-tooth wheels in units order, in

1! those instances in which the twelve-tooth wheels are situated in some other order it is the nose I3! next lower order that is elongated.

The twelve-tooth wheels I15 and H6 are provided each with a carry tooth 1% (Figs. 5 and 6) for cooperation with a carry pawl H5 in withdrawing the latch I'32 or 425 of next higher order through a link I96 and for arresting the wheels at zero in totaling operations. These devices are of the same sort as their ten-tooth counter parts. except in size and proportion to one another.

While there is above described but one embodiment of the invention, it is possible to produce still other embodiments without departure from the inventive concept above disclosed, and it is, therefore, desired that only such limitations shall be imposed on the appended claims as are stated therein, or required by the prior art.

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

1. In an accumulator of the class described, a parallel linkage in each of several denominational orders thereof, a pair of intermeshing wheels supported by each said linkage, a non-parallel linkage in one or more orders thereof, a pair of intermeshing wheels supported by each latter linkage, the wheels of the last said pair having a different number of the teeth than the wheels of the first said pair but all of the wheels being of substantially the same pitch, a rocking member common to all of said linkages, said member acting through said linkages to shift the wheels of a pair through linear distances rela tive to one another, and an eccentric connection between each non-parallel linkage and said rocking member whereby the wheels supported by each last said linkage are shifted different linear distances relative to one another than the wheels supported by a parallel linkage.

2. In one or more denominational orders of an accumulator of the class described, a linkage comprising an upper carrier and a lower carrier, a pair of intermeshing pinions, one supported by the upper carrier and one by the lower, a rocker common to all the orders of the accumulator and having upper and lower pivot rods, said lower carrier being pivoted on the lower of said rods, and an eccentric on the upper of said rods and fixed to rock with said rod in unison with and through the same angles as said rocker, said upper carrier being pivoted on said eccentric so as to impart to the former by the rocking of the latter an amount of movement different from that imparted to the lower carrier; V

3. In one or more denominational orders of an accumulator of the class described, a linkage comprising an upper carrier and a lower carrier, a pair of intermeshing pinions, one supported by the upper carrier and one by the lower, a rocker common to all the orders of the accumulator and having upper and lower pivot rods, said lower carrier being pivoted on the lower of said rods, and an eccentric fast on the rocker, said upper carrier being-pivoted on said eccentric so as to impart to the former by the rocking of latter anamount of movement different from that imparted to the lower carrier.

4. In an accumulator of the class described, a parallel linkage in each of several denominational orders thereof each such linkage including an upper carrier and a parallel lower carrier, a pair of intermeshing wheels supported by each pair of carriers, a non-parallel linkage in one or more orders thereof, each latter linkage including an upper carrier and a non-parallel lower carrier. a pair of intermeshing wheels supported by each pair of non-parallel carriers, wheels of the last said pair having a different number of teeth than the wheels of the first said pair, but allrof the wheels being of substantially the same pitch, a rocker common to all the orders of the accumulator and having upper and lower pivot rods on which the parallel carriers are pivoted, the lower non-parallel carriers also being pivoted on the lower rod, an eccentric fast on the rocker in each of said one or more orders, each non-parallel upper carrier being pivoted on a said eccentric so as by the rocking of said rocker to shift the wheels supported by the non-parallel carriers through linear distances relative to one another diiferent from those through which the wheels supported by the parallel carriers are shifted, a frame bar shifted by said rocker through the same linear distances as the parallel carriers, means to put all of the carriers under spring tension to rock about their pivots to effect a carry, a shoulder on each upper parallel carrier to engage said frame bar and limit the rocking movement of said carrier to one tooth space of the rack, and a shoulder on each nonparallel upper carrier but having two levels, one to engage said bar when the accumulator is set for addition and the other to engage said bar when in shifting the accumulator the non-parallel carrier is by its different linear movement moved relative to said frame bar both in the same direction as said linear movement and in a vertical direction.

ROBERT H. STROTHER.

No references cited.

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