US1792644A

US1792644A - Calculating machine

Info

Publication number: US1792644A
Authority: US
Publication date: 1931-02-17
Anticipated expiration: 1948-02-17

Description

Feb. 11,1931. E, KUHRT 1 19 44 CALCULATING MACHINE Filed Sept. '11, 1920 3 Sheets-Sheet 1- Q Aorlagn Feb. 17, 1931. E. KUHRT 1,792,544

CALCULATING MACHINE Filed P 1920 3 Sheets-Sheet 2 In wen Z01" ZrnsfKu/Zfi Feb. 17, 1931. Q E. KUHRT 1,792,644

CALCULAYTING MACHINE Filed Sept. 11-, 1920. i s sheets-sheet ZmsZKu/zrf jiiorney- Patented Feb. 17, 1931 UNITED STATES PATENT OFFICE ERNST KUHRT, OI BIRLIN-STEGLITZ, GEEK ANY, ABBIGNOR, BY MEN]? ASSIGN- MENTS, TO THE FIRM BRUNSVIGA-MASOHINENWEBKE GRIHME, NATALIS- & (.70.,

. A.-G., OI BRUNSWICK, GERMANY CALCULATING momma Application filed September 11, 1920, Serial No.

My invention relates to calculating machines and more particularly to machines of that type which is known as universal, that is, in which not only the four species of calculation, to wit, addition, multiplication, division and subtraction, may be performed but to which also a. printing mechanism may readily be adapted and it is an ob'ect of my invention to provide a machine 0 this type which, though it may thus be readily combined with a printing mechanism, is notwithstanding independent of such mechanism, that is, may be used as a calculating machine pure and simple, or as a combined calculating and printing or typewriting machine.

Combined calculating and typewriting machines have already been proposed but in such machines the paper'carriage of the type- Writing unit is operatively connected with the totalizers of the calculating unit so that the totalizers cannot be operated without the paper carriage. In my invention, no such relation exists so-that the machine may heused for recording the results of its calculations,that is, as a calculating machine independently of the printing mechanism, or it may cooperate with the printing mechanism but the operation of the calculating machine is not in any way dependent on, or interfered with, by the operation of the printing or typewriting mechanism.

The printing mechanism forms the subject matter of my co-pending application No. 230,553, and will not be described in detail.

My machine is of that type in which the number of efiective teeth in the setting wheels is variable and the teeth of the setting wheels are so influenced by means of partial products plates embodying products by projections correspondin to units and tens of units, that the units an the tens transfersto the setting Wheels are effected in succession.

The novel feature of m machine is that for each digit of the mac ine there is provided below each row at nine multiplicand keys 8. group of nine partial products plates corresponding to the multipliers from 1 to 9. By displacing the partial products plates laterally, their units and tens pro ect1ons are ,wheels. The cams of each pair are pitche 409,748,, and in Germany September 18, 1919.

alternately brought under the control of a g1ven multiplicand key and under the control of a multiplicandke in the next lower order during a portion 0 the cycle of operation. Each set of partial products plates is connected with a slide which is temporarily operatively connected with the partialproducts plates andwhich slide has a differential movement determined by said partial prod ucts plates for adjusting the setting wheels in accordance with such movement.

Each slide is provided with two cams the length of which is equal to the added lengths of projections on the teeth of the settin apart so that all teeth of the setting wheels are in operative position when the slides are stationary and the setting wheels are rotated. The direction of rotation of the setting wheels is so selected for the species of calculation which it is desired to perform that for each calculating operation the cams of the slides will place the teeth of the setting wheel in operative position beginning at one end of theset of teeth. The dial wheels are locked immediately against overthrowing by star wheels of known type.

The temporary operative connection of the slides with the partial products plates is effected by vertically adjustable plates the position of which is determined by the multiplier keys in accordance with the multiplier involved in a calculation, and the plates will operatively connect the slides with those pardepressed multiplier key.

In the drawings afiixed to this specification and forming part thereof a calculating machine embodying my invention is illustrated diagrammatically by way of example.

In the drawings Fig. 1 is a partly sectional elevation illustrating the actuating mechanism of the machine,

Fig. 2 is a sectional elevation, the section being taken between twogroups of partial products lates,

Fig.3 1s a sectional plan view of the ma chine,

tial products plates which correspond to a 85 Figs. 4 and 5 are plan views of two partial and s owing separately a set of multiplicand, keys with their locking plates, j line .X-X-iin.

Fig. 10 is a section 011 the two different 2, with the top plate of the keyboard" removed,

Fig. 11 is an end elevation of the set of locking plates, viewed from the left in Fig. 9,

- Fig. 12 is a detail view-showing one of the multiplicand keys depressed and locked by its plate, and v Fig. 13 is a section on the line XML-XIII in Fig; 2.

Referring now to the drawings and first to Figs. 1, 2, and 3, 1 is the frame of the machine, 10' is an arm secured on a shaft 10 within the frame 1, 6 is a connecting rod pivoted to the arm 10 at 9', and5 is a pin at the free end of the connecting rod Gwhich is free to reciprocate in a slot 7 of a spur gear 8'. The gear is free to rotate on a stud 3 in the frame 1. H 4 is a cam which is loosely seated on the stud 3 in front of the

spur gear

8, 2 is a camway constituted by a rib 2' projecting on the inside from that wall of the frame 1 which is adjacent the crank 9 as will appear from Fig. 3., This rib 2' is shaped on the inside. in conformity with the face of the cam ll, that is, the cain=way 2 made up hy the rib 2 and the cam i is substantially elliptical except at its largest horizontal diameter where

extensions

7 and 7" areprovided for the reception of the pin. 5 when the slot 7 in the gear 8 is registering with one of the extensions 7, 7'". The spur gear 8 is rotated by means which will be described so as to move its slot 7 into registering relation with the

slots

7 and 7".

gages the cam 4,

'from its initial position in Fi 14 "is thev main drivingshaft of the machine on which the setting wheels 15 are arranged as best seen in Fig. '3, and 12 is a inion on the end of the shaft 14. which is mes ing with the. spur ear8.-=

13 s a. pawl the rounded end of which ento pull the pawl toward the stud 3, and 13 is a handle towhich theend of the pawl is ivoted and which is adapted to he displaced 11) a slot in the top plate of the frame 1. When the crank 9 is rocked-the pin 5 causes the spur gear 8 to rotate. For each operation of th'e' machine the crank 9 is rocked away 1 in the direction of thearro'w into its fine position and is then returned to its initial position.

13 is a spring whirhtends The pawl 13' in thepbsition illustrated in'full lines in Fig. 1 tends to hold the cam 41' in its full-lines position; The cam is reversed when the pm 5 moves into the extension 7' at the left of the camway2, allowing the pawl 13 ,to'return the cam 4 to. its initial position andjbarring' the upper-left-hand reachof the cam'way 2 against re-entr'ance of the pin 5 soathatgthe'pin, upon the return stroke of the crankl) moves in the lower reach of the camway" 2. At the end of thereach it will force the cam 4 out of its-way again and enter the extension 7 at the right of the camway 2. The spur gear 8 therefore moves in the same direction for a full cycle of two reciprocations of the crank 9. When the pawl 13" is reversed, that is, when its'handle 13" 'is nioved into the dotted-lines position to the left in Fig. 1, it will tend to turn the cam 4: in anti-clockwise direction and the spur gear 8 will be reversed. 1

24 is a frame in which partial products plates 25 are arranged and which is adapted to be reciprocated transversely to the machine, that is, in arallel to theshait 10 of the crank 9. The rame is shown without the plates in Fig. 1. Its reciprocation is efiected by arms 37 38 whichare integral with the arm 10' and provided with adyustable pins 39and 40.. These pins act on an inclined cam 41, Fig. 3, on an extension of the frame 24.

When the crank 9 is rotated so as to hring the pin 39 to bear on the cam 41, the frame-24 is displaced to the left s viewed from the operator in Fig. 3, and hen the crank 9 is rotated so as to bring thb other pin, 40, to hear on the cam 41, the frame 2% is moved to, the

right. The partial products plates in the frame 2 1 are metal strips and two oi them are shown in Figs. 4 and 5. As mentioned, a set of nine partial products plates correspond to each of the nine digits of the machine and the sets are arranged below the rows at nine multiplicand keys &6. it will be understood that the machine has nine sets of partial prod ucts plates at nine strips 25 each. The strips 25 are provided. with projections on one of their longitudinal edges or on both edges, which projections are adapted to be brought under the control of the lower ends of the multiplicand keys 46 when any one of, such keys is depressed. As nine multiplicand keys 46 are arranged in a row to cooperate with each of the nine sets oi plates 25 the machine has 81 multiplicand keys in all.

Fig. 4 illustrates a partial products plate for the multiplier 1 and Fig. 5 illustrates a I late for the multiplier 7. At the left hand edge asvi'ewedfrom the front of the machine,

each plate25 is provided with projections 26 and, in addition to these, the plate correspendin to the multiplier 7, Fig. 5, is fr'ovide with rejections 26" at its'rightand edge whi etha't edge in the plate in Fig. 4 is blank. v'Ihis'is because the plate in Fig. 4 requires only the projections 26 as the highest number obtained by multiplying the digits 1 to 9 with the multi lier 1 is 9. On the other hand, the plate or the multiplier 7 as shown in Fig. '5 requires, besides the projections 26 for the

unit digits

1, 2, 3-, 9 of the

products

7, 14, 21, 28 63 on its lefthand edge, projections 26" on its right-hand edge representing the ten-folds of these products.

Each set of partial products plates 25 is combined with a slide 27, Fig. 2, which is.

adapted to be reciprocated longitudinally in the frame 1 of the machine against the action of a spring 27' and may engage the front end of its set of plates 25 by a projection 27". A shaft 28 is secured on the base plate of the machine and provided with an arm Fig. 3, which is controlled by a cam 30 on the main driving shaft 14 near the pinion 12 and held engaged with the cam 30 by a spring, not shown. The diameter of the pinion 1-2 is onehalf of that of the gear 8 so that the pinion performs two revolutions for each revolution of the gear 8. An arm 28 is secured on the shaft 28' for each slide 27 each arm enga ing a pin 29 on the slide 27 so that the slide is eld in the position illustrated in Fig; 2, unless the cam 30 forces the arms 28 in forward direction and allows the springs 27 to move the slides 27 in the same direction.

Nine multiplier keys 33 are provided in a transverse row at the front end of the machine, one multiplierkey being at the end of each longitudinal row of multiplicand keys 46. is a rectangular frame extending be low the frame 24 and fulcrumed about pins 34 at its center, as will a pear from Figs. 2 and 3. The front bar of ti: to be engaged by the multiplier keys as will appear rom Fig. 13 and its rear end is provided with pins 34 which engage suitable sockets in a transverse frame 32 which is substantially V-shaped. This frame supports a.

plate 31' for each set of partial products plates 25 which is mounted on the frame so as to partake in thevertical reciprocation impart ed to it by the frame 35. Each plate 31 is slotted to engage the vertical projection 27" on each of the slides 27. 'By depressing one of the multiplier keys 33, the plates 31 are all raised to a level which corresponds to the chararter of the multiplier key which has been depressed, and are placed opposite one of the partial productsplates 25 in each set so that this plate will be operatively connected with the corresponding slide 27 through the medium of the plate 31 and the pro ection 27. It will be understood that in this manner all the slides are connected with one of'the partial products plates but only those slides will be prevented from returning to their initial position for which multiplicand keys have been depressed so that the partial products plates will be retained by these multiphcand keys and prevent the slides from returne frame is adapted ing to their initial position. Springs'36 are provided for returning the frame 35 to its initial position. v

Nine setting wheels 15 are secured onthe main driving shaft 14 and one of them is illustrated in Figs. 6, 7 and 8." Each wheel is rovided with a set of nine radial teeth 16 w ich are arranged in radial slots in close vicinity at one side of the shaft 14. Their inner ends are hook-shaped and held in a plate 16' on the shaft 14, their outer ends are rovided with projection 17 at various radial istances from jections 17. The cams 42 serve for a given species of operations, and the cams 42' serve for the opposite species, for instance, the cams 42 become operativewhen' the operations of multiplication and addition are performed and the cams 42 become operative for the operations of division and subtraction, or vice versa. The osition'of the slides 27 with respect to the wheels 15 and to the projections 17 on the teeth 16 of such wheels which projections, as mentioned, are pitched at various radial distances from the axis of the shaft 14, determines the number of teeth that will be engaged by either the cams 42 or the cams 42 upon rotation of the setting wheels in a given direction. In this manner, a given number of projections 17 will be engaged by the cams 42 when the setting wheels are rotated, for instance, in the direction corresponding to multiplication or addition, and a corresponding number of projections will be engaged by the cams 42 when the setting wheels are rotated in the opposite direction for division or subtraction. Those teeth 16, the projections 17 of which have been engaged by either of the cams, will be forced against the body of their settting wheel 15, as shown in Fig. 7, above the shaft 14.

A frame 74 is slidably carried in the frame 1 of the machine as shown in Figs. 1 and 2, and supports shafts 18 and 18' multiplication dial wheels 19 and a set of division dial wheels 83, respectively, either set being adapted to be operated by the teeth 16 of the setting Wheels 15, in accordance with the calculation performed. displaced by hand for'setting the decades, and the dial placed by hand through one decade by means, not shown, but which will be understood by those skilled in the art. The displacement of the dials is effected with the object of movmg them into such positions that the moveon each slide 27 at opposite 14. The width of either for a set of The frame 74 is wheels 19, 83 may also be disis controlled. by the dials, as will be described below.

The multiplication dials 19 are free to ro-' tate on the shaft 18 in the frame 74. Each multiplication dial 19 is provided with a star wheel 20, Figs. 6, 7 and 8, and a disc 21 from which pins 23 project into the path of those teeth 16 which have been forced against the Wheel .15 by the

cams

42 or 42, as described. Radial slots 22 of varying depth are formed in each pin disc 21 and adapted to be entered by a tongue 82 on the corresponding slide. A second tongue is provid d on each slide for cooperation with notches 84 in the pin discs of the division dial wheels 83. The teeth of each star wheel 20 are curved between the pins 23 on a radius equal to that of the corresponding wheel 15 so that the are held against rotation but do not inter ere with the rotation of the wheel 15. Each wheel 15 is recessed at its perimeter at 15?) where the teeth 16 are arranged so that each star Wheel, its dial wheel and its pin disc are free to rotate when the star wheel registers with this recessed portion of the setting wheel. A plate 44 is arranged on the base of'the machine frame for returning the teeth 16 to their initial position when the are moving past the plate as indicated in ig. 6.

Each setting wheel is provided with an annular projection 104 on the face opposite to that on which the teeth 16 are carried.

The annular projection extends as far as a notch in each wheel where it is inter-- rupted and is rovided for operating the tens transfer which forms no part of the present invention and therefore has not been illustrated but will readily be understood from the following general description: L- shaped levers are pivoted on a pin extending in front of the shaft 18, one lever being provided for each dial. Springs tend to move the levers in upward direction. Each lever is provided with a check on its upper arm which is adapted to be engaged by a corresponding projection on the adjacent dial wheel 19 which is arranged between the digit 9 and 0. When the dial wheel is rotated past the digit 9 the corresponding L-shaped lever will be rocked on its pin. The lower end of'each lever is provided with a'spring catch which normally abuts on the face of the corresponding annular projection 104. However, when the lever has been swung downwardly by the check on the correspond-. ing dial wheel 19, it is engaged by the inner face of the annular projection 104, and retained. In this position of the lever it causes the next dial wheel at the left on the dial wheel considered to be rotated and in this manner the tens transfer is effected.

Thi dial wheels 83 of the division set are operated by means, not shown, which are similar to those operating the multiplication dial wheels 19 and their pin discs, as men-' tioned, are provided with slots adapted to be entered by the tongue 85 on each corresponding slide 27. A. multiplier which has .70 been set by means of the keys 33 is transferred 1 to the set of division dial wheels 83 by a very simple device which is not shown as it does 1 not constitute a part of the present invention, and comprises a rack and a stepped pinlon in the connection with the set of division dial wheels 83. The rack is reciprocated for each reciprocation of the crank 9 and meshes with a vertical pinion which is adapted to cooperate with a bevel gear on the shaft of the set of division dial wheels 83. Means are provided for operating this mechanism in Each slide 27 at its upper rear end is provided with a rack 77 Fig. 2, for operating a printing mechanism having type wheels 52 with pins 76 adapted to be engaged by the corresponding rack 77, a printing roller 66,

and operating mechanism comprising a cam plate, not shown, a lever 62, Fig. 3, on a shaft 61, a frame-shaped lever 60 and con necting rods 57, 58 as described in my copending patent application No. 230,553.

The keyboard, as mentioned, comprises eighty-one multiplicand keys 46 which cooperate with the partial products plates 25 in the frame 24 and nine multiplier keys 33 which cooperate with the front bar of the rocking frame 35. The multiplicand keys 46 are 0perated against the action of springs as shown initial position, and are provided with lateral members 45 which cooperate with a set of nine locking plates 48 for each row' at nine keys. Aninclined camway 47 with a short parallel extension 47' at its lower end is provided in each locking plate for the. corresponding multiplicand key as shown in Fig. .9 for the key 46a, and theplates are cut out at 50, 50 so as not to-interfere with the ice in Fig. 11 which tend to return them to their from Fig. 13, 51 is a locln'ng plate which for each multiplier key has a cam 51 adapted to be engaged by a member 33 on the corresponding key 33, 51" is arecess below each cam 51. and 51'" is a compression spring which tends to move the locking plate 51 to the right. When any one of the keys 33 is depressed, its member 33' pushes back the locking plate 51 by the cam 51 until the member 33 has entered the recess 51" when "the key is retained by the spring 51 moving the locking plate 51 intoits initlal position. The keys 33 are of various lengths, the key at the left being the shortest.

Assume that one of the multiplier keys 33 has been depressed and retained by theplate 51, and that one of the multiplicand keys 46 is thereupon also depressed. The operation of the key 33 causes all the plates 31 to be raised to a given position in accordance with the character of the key 33 which has been depressed. This efl'ects operative connection of all the slides 27 with one of the partial products lates 25 as vdescribed. Notwithstanding t is slides 27 are free to return to their initial position except that slide which corresponds to the, depressed multiplicand key46. This slide will be arrested on its return movement, and so will an other slides be for which other multiplican keys 46 may have been de ressed, these slides being per mitted to per orm only aportion of their return movement. Those slides for which multiplicand keys have not been depressed, are free to return to their initial position.

The operation of my machine will best be understood from an example, as follows:

Assume that it is desired to multiply the figure 764 by 7. The multiplicand 764 is set by depressing the corresponding keys 46 and the multiplier 7 is set by depressing the multiplier key 33 which is marked 7. The operation'of the multiplier key 33 causes the frame 35 to rock against the action of its springs 36 and to raise-the plates 31 into a position in which they are facing those a rtial products plates 25 in the frame 24w 1ch correspond to the'multiplier 7. The pro1ections 26" on the plates are within reach of those multiplicand keys 46 which 'havebeen depressed. The crank 9 is now rotated, imparting rotation to the shaft 14, to the setting wheels 15 and to the cam 30 by the means described. The cam 30 through the medium of the arms 28 releases the-slides. 27 an d the slides now return toward their initial position, but those slides for which any mult phcand keys 46 have been depressed are retained by engagement of. the PI'OjGCtIODS 26" on those partial products plates 25 which have been enga ed by the lates 31 of the corre sponding s 'des 27. hese slides are now arrested by the partial products plates abutting product 49 is added and the fourt against the ends of the keys 46 while the other slides are free to return. The conse uence is that for the first di 't of the multiplicand, counting from the ri t, that is 4, the cam 42 of the slide-which has been arrested by the cooperation of the multiplicandlkey 4 with the partialproducts plate 25 correspondingv to the multiplier 7 in that slide causes eight teeth 16 of the corresponding setting wheel 15 to be placed in operative position since 7 times 4 is 28, and consequently 8 unlts must be transferred to the corresponding dial wheel 19, which will then indicate 8 as the first digit, counting from the right. For the second digit, 6, the slide 27 is arrested by the multiplicand key 6 in such a position that two teeth 16 in thecorresponding setting Wheel are placed in operative position by the cam 42 of the corresponding slide 27, since 7 times 6 is 42, causing the second dial to be rotated to the number 2. For the third digit, 7, nine teeth are placed in operative position in the corresponding setting wheel as described, since 7 times 7 is 49 and there-' When the crank 9 is now returned toward its initial position at the right as illustrated in Fig. 2, While the setting wheels 15 start for.

their secondrotation, the slides 27 will again be displaced'but will be arrested on their return. movement by the projections 26", and

not by the projections 26 of the partial products plates. Now the tens of the partial products of 764 times 7 are transferred. No transfer is made for the first digit counting from the right, as there are no more keys at the right of the first set of multiplicand keys so'that the cam 42 of the first slide 27 is moved and consequently the first dial will remain at 8. For the second digit the 2 from the partial product 28 is transferred to the second dial so that it will indicate 4. For the third digit the 4 from the partial product 42 is transferred to the dial and, as 4+9=13, the digit 3 will appear on the third-dial. .By means of a tens transfer of known t pe in the counter the 1 from 3 is trans erred to the fourth dial so that on the fourth dial there appears the digit 1. To this 'digit 1 the ""from the ardtial ial shows the digit 5, the result being 53--28v This result can be printed as described in my said co-pending application.

For addition, thesetting wheels rotate in the same direction as for multi lication. The amount to be added is set on t e multiplicand keys 4.6 and thereupon the multiplier ey 33 marked 1 is. depressed so that onl the single amount'of the number to be adde and not a multiple thereof, is transferred at the setting wheels. 1

The operations of division and subtraction are performed similarly as multiplication and addition but in this case the pawl 13' is moved to cause the

gear wheels

8 and 12 to rotate in opposite direction as compared with multiplication and addition bythrowing over the cam a For division and subtraction the cams 4&2 of the slides 27 cooperate with the teeth 16 of the setting wheels instead of the cams 12.

v I wish it tohe understood that I do not desire to be limited to the exact details of construction shown anddescribed for obvious-- modifications will occur to a person skilled uct oi. the units, an

in the art.

I claim:

1. A calculating machinehaving rows of multiplicand keys, setting wheels, dial wheels operatively connected with said setting wheels, movable teeth in. said setting wheels adapted to cooperate with said multiplicand keys, and partial products plates with units-and tens-projections for the prod- "comprising arranging said partial products plates in groups of nine each, corresponding to the multipliers 1-9,

multiplicand keys, setting wheels, dial wheels operatively connected with said setting wheels, movable teeth in said setting wheels adapted to cooperate with said multiplicand keys, projections on said teeth, and partial products plates with units-and tens-projections for the product of the units, and comprising arranging said, partial products plates in groups of nine each, corresponding to the multipliers 1-9, below each row of multiplicand keys, means for displacing transversely said groups of partial products plates so as to alternately'movetheir units-. and tens- ;-ojections within reach of the row of multip 'ca'ndke'ys to which each group of partial roductsplates is allotted, and within reach 0 the preceding row of lower order, a

slide surrounding each group of partial products plates, means for v-temporarily connecting each slide with one of the partial products plates of its group, and two cams on each slide the length of each cam being e ual to the total width of said projections on t e teeth of said setting wheels, and said cams being pitched so that when said slides are stationary and said setting wheels rotate, all teeth of said setting wheels are moved into active position.

3. A calculating machine havin rows of multiplicand keys, setting wheels, dial wheels operatively connected with said setting Wheels, movable teeth in said setting wheels adapted to cooperate with said multiplicand keys and partial products plates with unitsand tens-projections for the product of the units, and comprising arranging said partial products plates in grou s of nine each, corresponding to the mu tipliers 1-9, below each row oimultiplicand keys, means for displacing transversely said groups of partial products plates so as to alternately move their unitsand tens-projections within reach of the row of multiplicand ke s to which each group of partial products p ates is allotted, and within reach of the preceding row of lower order, a slide surrounding each group of partial products. lates, a multiplier key for each decimal or er,'a movable plate on each side which is operatively connected with the corresponding multiplier key so as to be moved into registering relation with the partial products plate which corresponds to the multiplier ke which has been operated, and means on sai slides for cooperating with the teeth of said setting Wheels. i

4;. A calculating machine having rows of multiplicand keys, setting wheels, -dial" wheels 0 eratively connected with said setting w eels, movable teeth in said I 'setting wheels ada ted' to cooperate with sai multiplican keys, projections on said teeth, and partial products lates with unitsand tensrojections for t e product of the units, an comprising arranging said projections on said setting-wheel teeth in such manner on the teeth that, starting from the perimeter of said wheel, they are pitched" nearer the axis of said wheel for equal distances from tooth .to tooth, and arranging said partial products plates in groups of nine each, correspondin to the multipliers 1-9, below. each row -0 nultiplicandikeys, means. for displacing transversely said groups of partial products'plates so as to alternately move their unitsand tens-proect1ons within reach of the row of multiplicand kys to which each group of partial products plates is allotted, and within reach of the preceding row of lower order, a, slide surrounding each group of partial product plates, means for" temporarily connecting" each slide with one of the partial products plates of its group, and means on said slides for cooperating with the teeth of said setting wheels.

5. A calculating machine having an operating handle, rows of multiplicand keys, setting wheels, dial wheels operatively connected with said setting wheels, movable teeth in said setting wheels adapted to cooperate with said multiplicand keys, and partial products plates with unitsand tensprojections for the product of the units, and comprising arranging said partial products plates in groups of nine each, corresponding to the multipliers 19, below each row of multiplicand keys, a frame on which all said temporari the partial products plates of its group,

I groups of partial products plates are carried,

a cam on said frame, two pins on said crank adapted tocooperate with said cam so as to alternately displace said frame in opposite directions, and to alternately move the-unitsand tens-projections of said partial products, .plates within reach of the row of multiplicand keys to which each group of partial products plates is allotted, and within reach of the preceding row of lower order, a slide surrounding each group of partial products plates,means for temporarily connecting each slide with one of the partial products plates of its group, and means on said slides for cooperating with the teeth of said setting wheels.

6. A calculating machine having rows of multiplicand keys, setting wheels, dial wheels operatively connected with sa' 1 setting wheels, movable teeth in said setting wheels adapted to cooperate with said multiplicand keys, and partial products plates with unitsand tens-projections for the product of the units, and comprising arranging said partial products plates in groups of nine each, correspondingto th'emultipliers 1- -9, below each row of multiplicand keys, means for displacingitransversely said groups of partial products plates so as to alternately move their unitsand tensrojections within reach of the row of mu tiplicand keys to which each group of partial products plates is allotted, and within reach of the preceding row of lower order, a slide surrounding each group of partial products plates, means for y connecting each slide with one of means on said slides for cooperating with the teeth of said setting wheels, a frame, a rocking crank shaft in said frame, a connecting rod pivotally connected with said crank shaft at one end, a pin at the other end of said rod, a cam way on said machine frame having parallel extensions at diametrically opposite endsthereof, a movable cam forming part of said cam way, means for displacing said movable cam so as to alternately connect one and the other of said extensions with said cam way, a stud in said machine frame, a

gear wheel on said stud having a slot for the reception of said pin at the end of said connectmg rod, said slot being adapted to regwheels operatively connected with said setting wheels, and movable teeth in said setting wheels adapted to cooperate with said multiplicand keys, and comprising a slide 1 for each setting wheel, and two cams on each slide the length of each cam being equal to the total width of said projections on the teeth of said setting wheels, and said cams being pitched so that when said slides are stationary and said setting wheels rotate, 0

those teeth of said setting wheels with which the multiplicand keys. have cooperated, are

moved into active position.

In testimony whereof I afiix my si nature.