US2678162A - Computing machine - Google Patents

Description

May 11, 1954 J. HUTTON I 2,678,162

COMPUTING MACHINE Filed March 1, 1947 QlShee'ts-Sheet 1 JAMES 1.. HUTTON May 11, 1954 .1. 1.. HUTTON 2,678,162

7 COMPUTING MACHINE Filed March 1, 1947 9 Sheets-Sheet 2 IN V EN TOR.

I JA L. HUTTON ATTORNEY y 11, 1954 J. L. HUTTON COMPUTING MACHINE 9 Sheets-Sheet 5 Filed March 1, 1947 3mm JA MES L. HUTTON May 11, .1954 J. 1.. HUTT ON COMPUTING MACHINE 9 Sheets-Sheet 4 Filed March 1, 1947 3mm JAMES L. HUTTON y 11, 1954 J. L. HUTTON COMPUTING MACHINE 9 Sheets-Sheet 5 Filed March 1, 1947 a NR.

gwowvto'a JANE 5 L HUTTON May 11, 1954 J. L. HUTTON 7 COMPUTING MACHINE Filed March 1, 1947 9 Sheets-Sheet 6 LammmV/ r 4a I 1 JAMES L. HUTTON y 1, 1954 J. HUTTON 2,678,162

COMPUTING MACHINE Filed March 1, 1947 9 Sheets-Sheet 7 JAMES L. HUTTO N May 11, 1954 J. L. HUTTON COMPUTING MACHINE Filed March 1, 1947 I 9 Sheets-Sheet 8 I Jfis L. HU TON @TORNEY May 11, 1954 J. 1.. HUTTON COMPUTING MACHINE Filed March 1, 1947 9 Sheets-Sheet 9 INVENTOR.

JA ES L. HUTTO N BY M ATTORNEY Patented May 11, 1954 UNITED STATES PATENT OFFICE COMPUTING MACHINE James L, Hutton, Greensboro, N. 0.

Application March 1, 1947, Serial No. 731,799

9 Claims. 1

This invention relates to computing and recording machines, and its principal object is to provide a compact, simply constructed machine of comparatively few parts which is easy to operate, is light in weight, economical to manufacture and which can perform a variety of com puting functions. objects, the machine is designed so that many of the parts can be stamped out of sheet metal, with very few parts requiring the precision tolerances in manufacture heretofore required. The machine is adapted for either stylus or keyboard operation.

Stylus operated. adding machines are known, but in these machines of the prior art the stylus must be used to engage and move manually a rack or belt to actuate the registering or printing mechanism. In the present invention, no movement of the stylus is required other than to insert it into the desired digit opening in the stylus board and depress it lightly. This action releases the selector for immediate movement to differential position corresponding to the digit selected.

A further object of the invention is the provision of a loaded diiierential actuator or automatic selector which is released by stylus or key operation without the necessity of an operating bar to set it in motion. In known machines of the keyboard type, for example, depressing the selected key does not set the selector in motion. An operating handle must be actuated to release the selectors. In this machine, the selectors are automatically released for movement by the stylus or key operation, thus lightening the work load of the operating bar and lessening operator fatigue.

Another object is the provision of a simple and effective mechanism for accomplishing repeat addition, multiplication or division, working in corn junction with the selectors, the parts thereof being few and simple, this mechanism being shown in several forms.

Stiil another object is the provision of a simple feedback mechanism by means of which any number or total registered in the accumulators may be transferred back to the selectors without manual manipulation of the stylus board or keyboard. This comprises a novel cam and lever arrangement which is simple in construction and very effective in operation, saving much of the operators time in calculating.

A further object of the invention is the provision in one form of the invention of a shifting carriage for use in multiplication or division,

To accomplish these and other 2 which is located in and shifts entirely within the housing of the machine. A further feature of this carriage is that it is located directly below the selectors and functions without interfering with their operation.

Stilla further object is the association in one form of the invention of the shifting mechanism with the feedback and printing mechanisms. A novel feature of this arrangement is that the printing mechanism may be shifted to take a total at any point along the keyboard of machine. Also, with this mechanism, an operator may feed back any amount or total from the accumulator dials to the selectors and then shift the mechanism to print the same at any point along the keyboard. Thus, one or more columns of figures may be printed without the necessity of shifting the form on which the printing is being done. Each column may represent the same amounts as is necessary for duplicate work, either column may be an accumulative total, or one column may represent individual items and the other an accumulative total. This mechanism therefore will permit duplex work to be done on a single row of .dials, the number of dials being determined by the required capacity of the chine.

In one form of the invention the printing mechanism comprises a segment which is actuated by, the repeat mechanism operated by the selector, and during repeat operations the segment may be locked in position to print the selected digit, thus lightening the load on the operating bar and speeding up its operation. This construction also eliminates the possibility of an overprint or underprint which might result from swift repeat movement of the operating bar.

Other objects reside in the novel constructions, combinations and arrangements of parts herein described and shown in the accompanying drawings which are illustrative of practical embodiments of the invention and in which Figure 1 is a perspective view of the machine.

Figure 1a is a similar view of a modified form of the invention showinga portion of the printing mechanism at the front of the machine where it is associated with the repeat and shifting mechanisms.

Figure 2 is a plan view of the machine, with the upper part of the housing .cut away to disclose the working mechanism.

Figure 3 is a side elevation of the machine taken along the line 3-4 of Figure 2, parts of the machine being omitted for clarity of delineation.

Figure 4 is a side elevation of the machine 3 taken along the line l-15. of Figure 2, parts of the machine being omitted for clarity of delineation.

Figure 5 is an enlarged detail view showing the stylus board in cross section and one of the selector bars and associated parts in rest or starting position.

Figure 6 is an enlarged detail of a similar view, showing a stylus in operating position, with the selector bar advanced to express the digit selected by the stylus, and in addition, shows in elevation the dial indicator whereby the operator can check the accuracy of each operation.

Figure 7 is an enlarged detail in side elevation showing a portion of the dial accumulators or registering and carrying mechanism.

Figure 8 is a fragmentary plan detail of the dial registering and carrying mechanism shown in Figure 7.

Figure 9 is a perspective view of one unit or section of the dial registerin and carrying mechanism shown in Figures 7 and 8.

Figure 10 is a view showing the several finger carrying wheels of the carrying mechanism for the several registering dials, the fingers being arranged to show their stepped relationship when mounted consecutively on a common shaft.

Figure 11 is a fragmentary detail of a portion of the drive train for actuating the tens transfer mechanism for the accumulator.

Figure 12 is a fragmentary plan View of the dial registering and carrying mechanism shown in Figure with added means to permit shifting of the dial registering mechanism for multiplying.

Figure 13 is a side elevation of the sub-side frame supporting the control for the shifting mechanism referred to in connection with Figure 12.

Figure 14 is an end view of the device shown in Figure 13, looking in the direction of the arrow of Figure 13.

Figure 15 is a side elevation of a modification in which a simple keyboard mechanism is substituted for the stylus board shown in Figure 3.

Figure 16 is a side elevational view of a modified form of the repeating and feedback mechanism associated with a novel keyboard construction.

Figure 1? is a front elevational view of the mechanism shown in Figure 16, taken on the line ll il, looking in the direction of the arrows.

Figure 18 is a plan View of the mechanism shown in Figure 16, taken along the line 18-48, looking in the direction of the arrows.

Figure 19 is a perspective view of a detail similar to Figure 16, but showing a modification having one unit combination in one denomination of a selector with the repeating device and incorporating a printin mechanism set in motion by the actuation of a key on the keyboard.

Figure 20 is a perspective view of a detail of the shifting mechanism supporting means and part of the shifting mechanism, ShOWll'lg the novel printing mechanism combined therewith.

The machine comprises several component mechanisms which for facility of description are outlined as follows:

1. The stylus board and depressor bar.

2. The dial accumulators or registers and the carrying mechanism.

. Restoring and resetting mechanism. Addition mechanism.

. The subtraction mechanism.

. Totalling and clearing mechanism. Correction mechanism.

. Printing.

9. Stylus or keyboard check dials.

10. The repeat addition or feedback mechanism.

ll. Shifting mechanism.

12. Substitute keyboard mechanism.

These mechanism Will be described in detail and the functions combined and co-related, and illustrated by example.

The stylus board and depressor bar As shown in the drawings (Figure l), the machine comprises a casing or housing A, having on its upper surface a stylus board C in place of the conventional adding machine keyboard, with apertures D in place of the conventional adding machine keys. The stylus board as shown is arranged to accommodate a number having seven digits, although it will be obvious that the machine may be designed to handle any desired number of digits. Each digital representation comprises a vertically arranged row of apertures, nine in number, and between one or more of these rows, as desired, are arranged markings or indicia from 1 to 9 as at E, corresponding in numerical order with the aperture in lateral alignment or registration therewith. In Figure la, a modified form, the housing A encases a keyboard mechanism with keys Hi3 substituted for the stylus openings,

Beneath each vertical row of openings D is a depressor bar It (Figures 5 and 6), which extends at least for the full length of the stylus board C. Thus, for a machine having seven rows or denominations of digits as shown, there are seven depressor bars as l8, Hid, Illb, lilo, Illd, I06, and llif. Each bar has an upper flat, table-like surface lllif, inclusive, which has a downwardly extending apron 12 havin converging ends which terminate in a semi-circular bearing surface It. This bearing surface is journalled over a pin it which projects from the face of a bell crank lever l5 which is pivoted at IS. The upper arm of this lever terminates in a dog I 8 and the other arm is secured to one end of a spring is the free end of which is fastened to any convenient point in the housing or frame.

Each depressor bar lfll0f, inclusive, has associated therewith a selector bar or differential actuator 253-267, respectively, each being provided with spaced longitudinal slots 2!, 22, the bars riding on shafts Zia, 92, extending into these slots. Each selector bar or differential actuator has a rack 23 on its upper edge substantially midway of its length, and has a series of downwardly extending teeth 24 on its bottom edge substantially forward or to the left of said rack 23. A stop member 25 is shown pinned to the upper edge of said selector adjacent the forward end thereof. Obviously, this stop may be otherwise secured, or may be made integral with the bar. An angular bracket is also secured to or made integral with the bar below rack 23 and has a downwardly extending arm 26. A tension spring 21' is attached to this arm at one end to load the selector, for movement upon operation from the keyboard, the other end of the spring being suitably attached to the housing A or to the machine frame, as is well known in the art.

Each longitudinal row or column of keys together with the associated accumulator wheel or dial and the mechanism for actuating and controlling them may be referred to as denominate columns or denominations.

From the foregoing description, it will be seen that by inserting a stylus through an aperture,

for example, number 5 aperture in the units denomination as shown in Figure 6, and pressing lightly against the table I I, the pressure will cause the bearing surface I3 to engage pin l4, pivoting the bell crank lever about pin 15, causing the disengagement of dog It from teeth 24 of the selector. Under the tension of spring 21 the selector will shoot rearward until the stop 25 hits the stylus and stops the selector. Where used in this description, the word forward or forwardly will be interpreted to mean in a direction towards the front of the machine, or towards the operating bar F, and the word rearward or rearwardly, towards the rear of the machine or towards the platen oi, as seen in Figure 3.

The accumulator wheels or dials are mounted onshaft 38 and are positioned above the selector bars over the racks 23. The rack 23 of each selector is normally disengaged from its corre sponding dial or accumulator wheel 28, as shown in Figure 7, constituting an element of each ordinal accumulator assembly 28 including a unit having a gear of 10 teeth, an associated plate andpawl ZBaand a dial having the usual indicia from 1 to 9 and on its circumference. Thus, in an adding operation, the longitudinal movement of the selector and its rack will cause it to slide clear of the dial wheel until the stop 25': engages the stylus in the opening for the number selected. As the stylus is removed the table II moves up with it under the pull of spring H! which rocks bell crank lever i about pivot iii forcing the dog 58 back into enga ment with the rack E i which is now in an ad iced position, the extent of this advance being governed by the number selected by the stylus.

If another such number as 6, for example, in the tens column or denomination is set up in the machine to be added to the foregoing unit 5, the foregoing operation is repeated, and to complete the addition the operating bar F is depressed. The bar as shown in. Figures 2, 3 and 4, controls the arms 35a, pivoted on shaft 35, and links 32, 33 and arm 34. arm 34 are fixed to the shaft 35, the 36 being duplicated as 3400 on the other side of the machine, as shown in Figure 2. The arms 3 3. 34a and rod 35 f a bail and these will hereafter be referred to as bail t l. Thus, it will be soon that the operation of bar F causes bail 3'4 to move to the left to carry out a. sequence of operations which will hereinafter be described. To bring the dial mechanism into mesh with the selectors a camming plate 63 (Figures 3 and a) is provided, which is pivoted on stud 43d projecting from the frame of the machine (Figure 2). The plate 43 has an inwardly bent ca-inming lip etc adjacent the starting position of the rod and another ming lip its a position adjacent the extreme end of the stroke of said rod when it swings as a bail.

Carrying out the addition of the numbers here tofore set up in the machine to be added, as heretofore described, the bar F is depressed, causing the bail 33' to engage the carnniing plate 43 as it swings, the end of shaft it, which projects slightly past arm 34, engaging cam lip 43o pulling plate 43 down and causing stud 5319 thereon. to engage and depress as on plate 39 (Figure 4). The stud 537a rides against the fiat face of cam 42 carnming it backwards and holding it there frictionally until the plate is bumped up as will hereinafter be shown.

The link 33 and 2' The plate .38 is duplicated on the other side of the machine as 39a and the two are tied together by shaft 38 carrying the accumulator wheel assembly 28, this mechanism forming a carriage unit which is pivoted on shaft 31. The shaft 3?, or pivoting point for the carriage, lies forwardly of the cam :12. Therefore, when cam i2 is engaged by the stud 43?) the entire carriage is swung about shaftiil', bringing the dial or accumulator wheels 28 into engagement with the selector racks 23.

The continued forward movement of the bail brings rod into contact with the arm 26 on the selectors, restoring them. to their starting position, simultaneously rotating dial wheels 28 toset up therein and complete the addition of the two numbers we have selected. As the bail 34' approaches lip tile the selectors reach a position where the last tooth of rack is is directly above dog iii (Figures 3 or l), which rides into position under the tension of spring Hi. When the bail cam lip 430 the projecting part of shaft to bumps the cam lip d 50, knocking plate 33 upwardly and disengaging stud 4% from the cam ii, perr tting the carriage to return to starting position under the tension of spring 51.

Dial accumulators or registering and carrying mechanism The dial registering mechanism comprises a series of accumulator wheel assemblies incorporating the dial or accumulator wheels 28' with associated plates and pawls Zia a description of one ass mbly 23 will suffice for all as they are identical in construction and operation. These accumulator assemblies 28 are mounted on shaft 38 (Figure '7) which is carried by plates 3%, 3M which are pivoted on shaft Ill supported by the side frames of the machine. The plates as, 390. are fixed to the shaft 38 and, as heretofore describes, form a carriage for the accumulator assembly and the carrying mechanism.

Each carrying unit includes a carrying plate 4i, best shown in Figures '2, 8, 9, and each plate has its central portion cut away, encircling shaft 40. Formed integrally with the plate ii and projecting into the central opening thus provided are two oppositely arranged, radially extending cam lugs it- 56 (Figure '7) which are also bent laterally in opposite directions best shown in Figure 9. Positioned adjacent each camrning plate on the square shaft to are restting collars i8 and carrying plates 59 fixedly associated therewith on spacing hub 39a, each collar and plate forming a unit which is slio'iable laterally on shaft ill, the latte being carried by the carriage plates 39, 39a. These units will be referred to as carrying plates. The resetting collar 43 is of a diameter slightly less than the diameter of the central opening in plate 41, and it carries a short resetting stud or lateral projection etc. The carriage is mounted for vertically swinging movement on shaft 3?, which is supported by the side frames of the machine.

When a carryover is made in adding one digit to another, the dial or accumulator wheel, for example 28' in Figure '7, will rotate in a clockwise direction, with the pawl 28a rotating with it until it engages point Aid of plate ll, camming it backwards against its pivot 37 lifting it slightly and thus bringing cam it into engagement with resetting collar 48 (Figure 8) of the carrying plate unit. The collar 48, with associated plate 49, being loosely supported on square shaft 48, will thus be pulled or shifted laterally into the central opening of plate ll by said cam lug 46. The carrying plate 2-9 normally lies laterally of the adjacent dial wheel and has integral carrying fingers 52, 5212. Therefore, when cam 46 moves collar 48 laterally, fingers 52, 52a on plate 49 are also moved laterally directly into the path of the gear of the adjacent accumulator wheel representing the next higher digit. This is fully shown in Figures '7, 8 and 9.

After the carry has thus been set, it is necessary to complete, or add, the carry just set up. At this point the operating bar F is at the limit of its downward movement, having been depressed earlier in this description. Of course, the sequences heretofore described were performed almost instantaneously. With the operating bar F in this position, the accumulators in their mount on the carriage are in their elevated posi tion, out of mesh with rack At this time some means is needed to keep the dial wheels from spinning freely. For this purpose a shaft is mounted on the side frames of the machine and on this shaft a hook-shaped detent 54 is pivoted, the detent having a nose Me which engages the accumulator (a separate detent being provided for each accumulator) to keep it from rotating.

Another shaft 55 is supported by the side frames of the machine and is fixed in the path of the detents to limit their downward movement, as shown in Figures 7 and 9, when the carriage is dropped.

A tension spring 56, fixed at one end to a stud 54?) on detent fi l and to bar 55 at its other tends to hold said detent in static engagement with the dial wheels when they are disengaged from the selector bar rack.

Another tension spring is hooked at its upper end over the bar 55 and at its lower end over the shaft 32 on which the dials are mounted. This spring tends to keep the dials out of mesh with the selector bar racks 23; until the bar F is depressed to bring the cam plate 43 into play as heretofore described.

Restoring and resetting mechanism I have brought the bar F to the limit of its downward travel and have brought bail M (Figure 3) to the limit of its forward travel. I must now restore the bail to its starting position which is done merely by releasing bar F.

Pivoted for swinging movement adjacent the side frame of the machine is a gear segment (Figure 13.) pivoted to the frame at 5% by means of an arm (it. The lower edge of the segment is toothed as at The arm 6t of the segment carries a short stud titre. A bar 6% is fixed to shaft 35, the bar being positioned between arm 34 and the side frame of the machine and it is slotted at its upper end with the stud 60a projeoting into this slot.

The shaft 38 carrying the dials or accumulators extends into the path of the gear segment 58 as shown in Figure 2. A spool gear having a hub 62 with gears 63 and 6 1 (Figures 2 and 11) mounted at opposite ends thereof is freely and rotatably mounted on shaft The gear 64 is verti-- cally aligned with the teeth on gear segment 58, and is meshed therewith when the dials and carrying mechanism are in elevated position.

When the bar F was depressed the arm 6 i, fixed on shaft 325 was actuated in the direction of the operator, transmitting its motion through stud 60a and arm 60 to gear segment 58 which is thus rotated through an are about its pivot 59. During this forward travel of the segment, when adding, it is not in mesh with gear 64 because the shaft 38 at this time is down, the accumulator being in mesh with the selectors until released by plate 43. An angle plate 63a, arcuate in side elevation, as shown in Figure 4, is fixed to arm 56 at such a point below the segment 58 as to permit projecting end of shaft 38 to pass under said plate 63a, as shown in dotted lines in Figure 11, on the forward sweep of the segment, and to pass over the plate with the gear 64 in mesh with 58 on the return sweep of the segment, or vice versa, when subtracting. The are of plate 63a is substantially concentric with that of the gear segment and the plate terminates short of the ends thereof so that the shaft 38 may slip over said ends and bring gear 64 into or out of mesh with the segment as the case may be. A stud 65 projecting from the side frame of the machine holds gear 54 against rotation when it is out of mesh with segment 58.

The cam plate 63 pivoting around point 43d, normally will hold down the mechanism of the accumulator carriage after the projecting stud of rod 36 has hit and passed over cam 33a. The plate 63a, however, will insure the retention of the mechanism in its depressed position by passing over the projecting end of shaft 38 on the forward stroke of the bar iii and bail 34' until the end of said stroke, when the projecting portion of rod 36, forming a stud (Figure 4) hits cam Me and releases the carriage so that it may swing upwardly.

As the bar iii and bail 34 return to their starting position, the gear segment, now in mesh with gear 64, causes this gear to rotate, transmitting its motion through hub 62 and gear $3 to gear at, the ratio between the gear segment 58 and gear 58 being so proportioned that the latter is turned through one complete revolution, in adding, when the segment returns to its starting position. The gear 50 and its connected hub is mounted so as to be slidable laterally on square shaft it, and also rotates with the shaft.

Addition cycle The numerals 5 and 1'7 will be added to show a cycle of operation. The stylus is inserted at 5 in the units denomination and depressed, releasing selector bar it? and arresting its movement five spaces to the right, as in Figures 3 and 4. Then bar F is operated, actuating the bail 35 and arm 6| with associated parts. As the bail and arm 6| move forward, the stub end of rod 36 first hits cam 43cc forcing pin ltb against cam 42 rocking carriage 39 downwardly, putting the dial wheels into mesh with the selector bars. Continued movement of the bail causes rod 36 to engage arm 25 on the selector bar, pushing it back to its starting position, at the same time rotating the units order dial of the accumulator and setting up the number 5 in the dial. Near the end of its forward stroke the bail causes the stub end of rod 36 to hit cam 43c, raising it by swinging it on pivot 43d, thus causing disengagement of pin 435 from cam =12, spring 51 raising the dial carriage, thereby disengaging the accumulator dial from the restored selector bar.

Simultaneously with the forward movement of the bail, the arm 5|, which is fixed on the same shaft 35, moves forward, carrying with it the gear segment 58 by means already described. As pointed out above, during this movement gear 64 is not in mesh with the segment, and shaft 38 rides under plate 63a. When the arm 6| reaches the forward limit of its travel, rod 35 hits earn 430 and shaft 38 is shifted upwardly; the relative positions of the segment 58 and gear 56; are then as shown in dotted lines in Figure 11, with the parts in mesh.

The bar F is now released, causing the bail and arm iii to return to starting position. The return of segment 58 causes rotation of gear 64 (Figures 4 and 11), hub 62 (Figure 2), gear 63 and gear 50, the latter rotating one complete revolution. However, as no carry has been initiated from any lower order accumulator dial, the rotation at this time performs no function. I now have digit registered in the units order dial and I am about to add the number 17.

The number '7 is set up in a manner similar to that of the number 5, as just described, the selector lbar shooting to the right in Figure 4 seven notches or teeth. Then the numeral 1 is punched in the tens column and the corresponding selector moves to the right one notch or tooth. It is important to remember that during this movement of the selectors, when adding, the dials are not in mesh therewith. This is clearly shown in Figure 4.

Now the bar F is depressed sothat the numeral 17 is added to 5. As the numeral 7 is added to the numeral 5 in the units dial, this dial is rotated a total of 12 steps and the finger 28a attached to this dial completes a revolution, clockwise, past point 41a (Figure 7) raising plate 4| and causing cam 46 to engage resetting collar 48, drawing it laterally into the opening in plate 4| and pulling carrying plate 49" into the path of the gear of the tens dial so that tooth 52 (in addition) meshes with the gear of the tens dial, all as fully shown in Figure 9.

The bar F is now released, which causes bail and arm BI to return again to starting position as outlined above, the gear 64 now meshing with segment 58. The return of the segment from its dotted line position as shown in Figure 11 rotates this gear and hub 62, gears 63 and 5E]. The gear 50 rotates one complete revolution thus rotating the shaft 48 and the members mounted thereon. The finger 52 of carrying plate 49, now in the path of th gear of the tens dial, rotates that dial by one tooth or step. As I have already set the number 1 up in this dial, this additional rotation of one tooth will register the number 2 in the tens. dial. As thefinger 52 clears the dial gear the continued rotation of shaft es, on the half turn, brings pin 48a on resetting collar 48 into engagement with cam 46 on plate 4! forcing the plate downwardly, which causes cam 45, op-

posite cam 46, engagingthe rim of collar 48, to push it or shift it laterally, or to theleft as shown in Figure 8, moving. the carrying plate as and finger 52 laterally out of the path of the dial gears and into neutral position. I now have a total of 22 registered in the accumulator dials, which is the sum of the 5 and 1'7 added.

The subtracting mechanism 10 out engaging cam lip 43a, all as shown in Figure 3. A stud 69 is fixed on arm 34 so that when lever 65 is pulled downwardly the cam face 660 thereon is brought into the path of this stud.

The numeral 5 will now be subtracted from the 22 previously totalled to show a cycle of operation. The minuend 22 has already been registered in the dials. With subtract lever 66 set, the subtrahend 5 is. then set up in the units dial by selecting opening No. 5 in the stylus board and releasing the selector as previously described. When the selector moves rearward this time, in distinction to the action when adding, the dial gears are engaged on the rearward stroke of the selector because shaft 38 has been depressed by cam 56a. At this time the dial gears rotate in a counter-clockwise direction, and the units dial is turned back 5 steps or teeth turning the dial backwards from 2 to '7. By subtracting the 5 on the units dial, the carrying pawl or finger 28a (Figure 8) strikes point 41a lifting plate 4! and causing carrying plate 49 to be carnrned over to the right as shown in Figure 8, as previously, described, bringing the finger 52a into the path of its associated dial gear in the tens column.

The bar F is now depressed, actuating the bail 34-. As the [bail moves forward it performs the following several functions in this phase of its operation.

1. Resets lever 65: The stud 69 on bar 34 engages cam 66c of lever 68, resetting that lever to its starting position. The resetting of the lever causes 2. Rocking of dial carriage: The shaft 38 is l caused to be released from contact with cam face E and the shaft is elevated by tension spring 51, (Figure 3) thus disengaging the dial gears from the racks of the selector bars, at the same time engaging gear 64 with segment 58.

3. Drops cam plate 43: The hook 65b on lever 66 is dropped, causing the cam plate 43 to drop.

4. Restores selector bars: The selector bars which were advanced are restored by bail 34 to their starting position where they are engaged by the dogs 18.

5. Rotates gear segment 58: The rotation of gear segment 58 is caused by bar 6! associated with bail 34 and results in turning shaft 40 through gear 64, hub e2, gears 63 and 55} (Fig. 2), turning out the carry previously set up in the tens dial. In this action the finger 52a of the collar 49 associated with the tens column is rotated counterclockwise (Fig. 9) with the result that the corresponding dial is rotated back one tooth, setting up the digit 1 on the dial, and the pin 480; hits the cam lug 46 from the bottom, with the resulting lateral shift of the carrying plate and fingers, disengaging the latter from its dial gear.

The bar F is now released and we have the total 17 registered in the dials. Gear (:24 remains engaged with segment 5% during the return stroke of the latter when bar F is released, but rotation of the shaft 40 by the gear is then idle.

Totalz'zz'ng and clearing mechanism To take a total and reset the dials to zero, a lever 10 is provided (Figure 4), suitably pivoted on a stud 1| carried by the side frames. At its lower end this lever is pivoted to a link bar I2 which has an upwardly extending arm 13 pivoted thereto at 72b and which is additionally pivoted to the side frame at 74.. A similar arm 13a is provided on the other side of the machine (Figure 2 and these arms are joined by a crossbar 15 with which they form a bail and these parts will hereafter be described as bail 15'. This bail lies adjacent the overhanging stop portion 4 Id of the plates 4 I.

Intermediate the ends of link 12, levers Iii, 16a are pivoted on opposite sides of the machine on a shaft Tl extending through the frame. A stud 12a is fixed to link 12 to the left of lever 16 as shown in Figure 4. The levers 16, 16a are joined by a crossbar 18, forming a bail and these parts will hereafter be referred to as bail 18.

By pulling lever 10 forward the link 12 is moved to the right as shown in Figure 4, causing pin 12d on projection [20 of lever 12 to hit the shoulder 66d of the subtract lever 66, thereby swinging this lever about its pivot 61 and pulling the dial gears downwardly into mesh with the selectors as heretofore explained. Simultaneously with this movement, the bail I is swung forwardly or to the left (Figures 3 and 4) to seat under the projecting lugs 4| (1 of plates 4!. By the time the lever 66 has been shifted, and the bail 75' seated, the pin [20: on link 12 engages lever 78, forcing bail 18' against levers l1, rocking them about their pivots l5 and withdrawing dogs is from the teeth 24 of the selector bars allowing them to be propelled rearward under the tension of springs 21. The dial gears, being in mesh with the selectors are thus rotated. The bail '15, having locked plates 4| against movement, prevents any carries from being set up. As we still have the number 17 registered in the dials, th units and tens dials will rotate counter-clockwise (Figs. 3 and 4) back to zero as the carrying pawls or fingers 28a, 28b abut against the points corresponding to Mo on their respective plates: 4!. As these plates are locked against movement, the pawls or fingers stop, and the corresponding dials will be at zero. Those dials which were at zero when the selector bars wer released will undergo no change.

Release of lever restores bail and dogs Hi to normal and removes pin (2d from contact with shoulder ilid. Operating bar F is then depressed to restore the selector bars, and to restore the subtraction lever 66 through engageinent 606f stud 69 on arm 34 with cam face 660 on ever Correction mechanism In order to make a correction on the machine where a digit has been erroneously punched in with the stylus or on the keyboard, a lever i9 (Figure l) is provided which is pivoted to the side frames at 19c. One end of this lever, below pivot 19a, is pivoted to a link 80, the other end of which is slotted as at 8011 and is sup-ported by a pin s! passing through said slot, the pin being supported at any convenient point in the side frame. Intermediate the ends of said link 80 two cams 83b and. 860 are provided thereon. The cam 89c engages the latch 82 on the rearward movement of the link and lifts said latch. The other cam illlb engages lip 83a on lever arm 83 of a bell crank lever which is pivoted at point 61. The other arm 83!) of this lever is designed to engage the pin 68 on cam plate 43 when the lever is actuated as will now be described.

Both cams 30b and 8110 move simultaneously, shifting the indicated levers. The lifting of the latch 82 disengages the printing mechanism from the operating lever 34 to prevent printing, as will hereinafter be described. The lifting of the cam plate 43 by lever 83 is intended to raise cam lip 43a out of the path of bail rod 36 to prevent the dial wheel mechanism from being pulled into engagement with the selector bars. With the cam plate 43 thus raised, all that is necessary to clear the error from the machine is to depress operating bar F, bringing operating bail 34' forward to engage the selector bars which were erroneously projected and restore them to their starting position. Lever 19 is then released.

Printing The invention provides for two forms of printing mechanisms. In the form shown in Figure 3, a simple printing device is located at the rear of the machine, by means of which individual amounts and totals may be recorded on a tape as is well known in the art. The printing type 20a is carried on the bottom face of the right hand end of the selectors 28 as best shown in Figure 3.

The forward movement of the arm 34 simultaneously engages latch 82 by means of pin 84 fixed on said arm and pulls the latch forward or to the left. A lever 85 is pivoted to latch 82 at 8'! and this lever together with latch 82 is pivoted to a portion of the machine frame at 86. A tension spring 88 acts to pull this lever to the right and keep the latch 82 in engagement with the stud 84, at the same time keeping shoulder 85b of lever 85 in engagement with lip 89 of plate 90. The lever 85 has a lip 35a at its lower end to support latch 32 and keep it from dropping when not engaged with stud 84.

When the bar F is depressed after a number has been set up in the selectors, the latch 82 will be pulled forward or to the left, pivoting lever 85 about the pivot 86 so as to kick its shoulder 851) out of contact with lip 89. A red 92 joins side plates 911, a (Figures 2 and 3) and passes through each of the selector bars as shown, the plates being pivoted on shaft 32*. A tension spring 93 is hooked at one end to the lip 89 and at its lower end is secured to any convenient point of the machine frame to snap the printing mechanism downwardly when the lever 85 is kicked from beneath lip 89. The forward move ment of arm 34 not only causes the printing mechanism to drop, but also resets said mechanism. This is accomplished by means of a cam plate 94 pivoted to the frame at 95. The plate 90 has a downwardly projecting portion 9% which lies in the path of the plate 94. When the printing mechanism drops on the forward movement of arm 34, the point 9% engages the corner 94a of plate 94 and pivots said plate to the left. The plate has a cam surface 942) which is engaged by stud 69 on arm 34 as the latter moves to the left. As the stud passes under the cam on its initial movement the plate 9a is rocked on its pivot, swinging plate 90 and associated printing mechanism upwardly so that shoulder 85b becomes seated under lip 39, the spring 88 pulling it into seated position as the latch 82 is released from stud 84 by the camming action of its for- Ward portion 820, against cam 80:: of link 80 upon forward movement of arm 34.

Thus, in operation, after the selector bar or bars have been projected, the operation of bar F will kick out lever 35 and spring 93 will pull the bars down to print over the platen 9!, which is secured to the frame of the machine in any convenient known manner.

When the bar F is released, the arm 34 moves back to its original position and latch 82 rides up and over the stud 84.

In the form of the invention shown in Figures 1a, 19 and 20, the printing mechanism is disposed at the front end of the machine, but since it is built into the repeat mechanism it will be de scribed in conjunction therewith.

Stylus or keyboard check dials These mechanisms are located adjacent the board checking device by means of which the operator can visually check the accuracy of the digits set up in the machine after each operation, and the machine is also provided with repeat addition or multiplication mechanism which re quires only the repeat manipulation of the operating bar F, eliminating repeat stylus operations.

These mechanisms, are located adjacent the selector bars. The indicator comprises a series of dial, gear and cam units, one for each selector bar, as will hereinafter appear. As these dial, gear and cam units are identical in construction, operation and function, a description of one unit thereof will suflice for all.

A shaft 96 is mounted in the side frames of the machine above the selector bars, and the dials, gears and cams forming the units above referred to are mounted on said shaft. Thus, in Figure 3, we have a stepped, circular cam or stop member 91 fixed to the dial gear 98, to which is attached the dial 98a (Figure 2). The cam 9! has ten steps including the cypher, and the dial gears thereof are meshed with the selectors as shown.

Repeat addition or feedback mechanism The repeat addition or multiplication and feedback mechanism is shown in Figures 3, 16 and 19. Figures 16' and 19 show modifications which may be substituted for the corresponding mechanism in Figure 3, and Figure 19 shows, in addition, a novel form of printing mechanism combined with the repeat and feedback mechanism. It will be obvious to those skilled in the art that if the printing mechanism of Figure 19 were used in Figure 3, the printing members shown in that figure would be omitted. In Figure 3, the repeat and feedback mechanism is located below the selectors as follows. Below the selectors a pair of tie-rods 89, 99a extend between the side frames of the machine, and the mechanism referred to is mounted on these rods. Each ordinal unit of said mechanism includes a vertically sliding latch or sensing lever Hit having upper and lower slots lllila, Hlilb through which rods 99, 39a, respectively, extend. This lever also has a forwardly directed extension iiiilc at one side carrying a stud IBM and at its opposite side the lever is toothed as at mile for a portion of its length. At

its upper end lever Hill has a sensing nose or pawl illilf. A tension spring 32 is joined at one end to rod 95 and at i s ot. er end to stud 190d on lever I00. Pivoted on the shaft 93 is an arm Ifii having an extension 59in through which a bail rod lib is passed, and having a pointed finger or pawl lilic extending in a reverse direction.

Pivoted at spaced points on shaft 3| (Figures 2 and 3) and joined by a connecting rod N33 to form a bail are a pair of cams Hhla, limo, one of which has an operating handle IN. The cam portion Edda extends along an axis substan tially at right angles thereto and terminates in a cam face w ll having notches iMc and w ld at the upper and lower portions thereof, respec tively.

Another lever W5 is pivoted to the machine frame on stud iilii (Figure 3) and this lever extends to the left of the pivot with an arm terminating in a lip liliia bent into the pathof the 14 movement of the cam Hilda. The other end of lever I05 extends to the right of its pivot with an arm terminating in a cam face iiliib which abuts bail l8 heretofore described.

The operation of the indicato or keyboard check and repeat mechanism is as follows. We will assume that the unit 5 has been punched in the key (or stylus) board, releasing the selector and rotating the cam dial unit 82, 53, 83a, exposing the digit 5 in the units column of window G (Figure l) and bringing the fifth step on cam 91 into alignment with pawl HJBf.

A pull on lever i M in the direction of the operator will cause rod ifllb to ride out of notch I040 in cam plate 1040.. As the cam passes upwardly over the rod, it pushes the latter laterally to the right and the lever i0 1, pivoting on rod $5 swings to the right disengaging pawl iilic from toothed rack idile, whereupon tension spring It)? will cause sliding lever to snap upwardly.

As the cam 9'! has been rotated through an are covering a span of five teeth, the pawl I00 of sensing lever I00 will engage the fifth step of said cam, as shown in Figure 6, to limit the subsequent movement of the selector. As the rod 1% forms a bail with cam 34a and its complement 1040. on the other side of the machine, the mechanism for each selector corresponding to levers 5M, NH is similarly operated when the handle I04 is pulled. Since, however, no number was punched in any of the other denominations, none of the remaining selector bars were actuated, so the remaining cams and dials corresponding to cams and dials 9'1, 98, respectively, were not rotated, and the pawls lilllf snapped into the zero step thereof.

While these sensing actions were taking place, the cam face i041? was riding over the rod lGlb. When notch m ld moves into alignment with rod l0lb, spring lilZa, hooked at one end to shaft 3% and at the other end to rod Iillb, pulls lever lill forward, causing pawl itic, to re-engage the toothed rack Wile at a lower point, thus locking sensing lever we at a fixed radial position with re spect to the stepped cam and dial unit corresponding to the digit 5 setting thereof. The toothed rack a has teeth equal in number to the number of steps of the cam ii'i, that is to say, ten teeth or notches, so that if the fifth step on cam 9'! is engaged by pawl 1M! 1, the fifth notch on rack lflte will be engaged by pawl ltic.

As the rod I0 lb drops into the lower notch iil i'd, the top edge of cam iota, moving upwardly, en-

,gages lip l05a of lever use, causing it to pivot around point HIE, pushing cam face liii'zb against .bail 78' which in turn rocks the lever I! of each selector bar mechanism, disengaging dogs is from said bars. The spring 2? will tend to pull the bars to the right as seen in Figure 3, and the bail 3 1 will restore them. onoperation of bar F.

At this point we have the unit 5 set up in the machine and the repeat mechanism set accordingly. If we wish to repeat this numeral, all that remains to be done according to this invention is to depress the operating bar F as many times as it is desired to repeat the number. Depressing bar F first brings the dial carriage down, bringing the dials into mesh with the selectors, and as the bail as continues to go forward it returns or restores the units order selector to its starting position, thereby rotating the dial. As bar F is released, the dials swing out of mesh with the selectors, bringing the gear t l into mesh with segment 58 actuating square shaft 48 one revolution, to enter any carries set up in the machine.

Such release also accomplishes the additional function of allowing the selectors to return to indexed position. Pushing and releasing bar F again repeats the cycle. In order to normalize the machine following a repeat operation, it is only necessary to return lever lfii rearwardiy to its normal or home position while bar F is held depressed for the last repeat cycle, so that the selectors will not return again to indexed position when the bar F is released.

The repeat mechanism will not only repeat what has been set up in the selectors through the keyboard, but will also pick up and repeat acouinulated totals without, as in other machines, man1.1.aliy setting up again on the keyboard the total it is desired to picl; up. In other words, the total is fed bacl: to and sets the selector, and the repeat mechanism merely senses and retains that setting. The following illustration will exemplify this feature: W will assume that we have a total of 22 carried on the dials, and we now wish to multiply this by The totalling or clearing lever it is pulled which clears the accumulator dials but, heretofore explained, will reflect the number 22 through the selectors to the keyboard indicator dials Then lever :06 is pulled which causes fingers Hill to sense the dial cams be differentially positioned in accordance with the posi ion of the selectors, that is, they engage, respectively, the second step of the cam of the units and selectors as only these are an advanced position. Now the bar F is operated to restore the machine to starting position. The accumulator dials now being cleared, it i necessary only to operate bar F fiv times to carry out the desired multiplication with the product appearing in the accumulator dials. If it is desired to clear the machine, this may be done by pulling the clearing lever l] and then operating bai- F as described. The setting of the selectors, or the digits set up therein, can always be determined by a glance at the indicator dials Bile through the window G.

Thus, for example, if a wcrkmans time was being calculated, the number of hours had been totalled, it would ordinarily, without this mechanism, be necessary to copy back to th keyboard by manual means the total number of hours worked so that it could be multiplied by the rate 1 hour to determine the amount due the workman. With this repeat or feedback mechanism the said total is automatically fed back into the repeat mechanism by first pulling totalling war it; which releases the selectors which project rearward to clear the accumulator dials as heretofore described. With the selector bars thus advanced, the lever [lid is then pulled, which actuates sensing lever St ll as explained, into engagement with said selector bar dial cams ll to take up the total cleared from the accumulator dials. we would then have the total number of hours transferred back to the repeat and feedback mechanism, and by manipulating the operating bar F this amount could be multiplied by any single digit multiplier, such as the rate per hour, to determine the total pay due the workman. In the same way discounts and other computations could be calculated.

After the repeat mechanism has performed its function it is restored. to starting or rest position by pushing lever Hi l in a direction away from the operator, Or to the right as shown in Figure 3. This causes crossbar lilt, which is carried by cams Nita, to engage the forwardly directed projection Iil lc of l ver Hill and pull same downwardly, the face I041) simultaneously disengaging dog IiiIc from toothed rack 1004. Er ror lever "I9 and operating bar F are then operated to restore the selectors. The mechanism is shown in starting or rest position in Figure 3.

Another form of repeating and feedback mechanism is shown in Figures 16-20, inclusive, and in this form of the invention a novel printing mechanism is associated therewith. Also, in this form of the invention, the repeating and feedback if echanis. r with the printer may be shifted at from a lower to a higher denominaor i and vice versa to perform a variety of coinputuig and recording functions. This form of the invention is adaptable for the preparation of various business records such as are customarily kept on card and with the innovations about to be scribed an operator may optionally print one or more columns of figures thereon without the necessity of shifting the card or form. Such columns may be identical wher duplicate wort: is necessary, or either column may be an accumulative total. or each column may represent separate or individual totals, or they may represent a combination of separate and accumulative totals.

Associated with each selector is a keyboard mechanism as shown in Figures 16, 17. Each key has a button Hi3 and a downwardly extending stem lZt} surrounded by a compression spring I26. Pivoted to each key at i2; is a downwardly extending latch member I28 which passes through the stern opening in keyboard plate I03 and terminates in a narrower or reduced extension I28 having a hoot: itfsa adjacent the depressor bar I2. The spring 26 is supported between the horizontal arm I281) of latch member I28 and sub-frame plate iilii. The latch member, where it passes through plate IE3, has a cam edge I29 which engages with the Wall of the opening in plate Ital as will hereinafter be described.

In this form of the invention, a sliding lever or latch H having a bent lip Hit i mounted to slide vertically on bars at, 99a to engage the stop 91 of selector bar 25: which is also modified. The latch 5% also has a lateral extension I000 at one end and at its opposite edge is toothed as a reel; Elite for a portion of its length. A ten sion spring lttia is joined at one end to rod 99 and its other end to stud ltI' on latch I2 I. The arm is! in the form of a bail (Figure 18) is pivoted on rod and has a downwardly extenclskirt portion terminating in a knife edge one projectin laterally in the direction of the toothed rack l The skirt portion is bent around he sides as shown in Figure 16 and forms a surface l l ld corersponding in function to cam notch Hi ls]. of Figure 3. Latch I2! is pivoted to latch file at arm, the latch being offset to the left at its pivot and extending downwardly therefrom to form support for stud IN. The upper end of the latch has a cut-away notch 12 I which engages the terminal lip IZIla of arm 12s.

As already indicated, the selector 20 is modified in this form of the invention, the bottom edge thereof being provided with an elongated cam face 9?", corresponding in function to cams 9'! Figure 3). A notch or cut-away 91'' is formed adjacent the inner end of the cam. The arm I20 of the depressor bar i2" has an angularly bent lip 52% which extends into notch I2I of arm lilI.

A lever 04 is pivoted on shaft TI and has a lateral extension Ill la' which carries rod or bail 11. IIlIb", which is supportedinamanner similar to rod Hill), as shown in Figure 2.,

In the operation of this mechanism, depressing any key causes latch I28 to-pivot on I21 as cam I29 rides over theedge of the aperture in plate I08, forcing hook I28a beneath the depressor bar I2"; The casing A limits the downward stroke of thekey. The bar. I2" at its right hand end, looking at Figures. 16 and 19, pivots on rod I30 and, is supported at its left hand end. by a light tension spring I3I dropped from the casing of the machine.

Depressing a key IIll. slightly will cause the stem I25 to press against depressor bar I2", lowering it and its connected arm I20. This causes member I2I to push against its pivot I2 Ia and exert downward pressure against connected sensing lever or latch I001; thereby disengaging it from stop 91, and releasing, the selector for movement. under the tehsionof spring 27', This causes selector cam 91" to snap against lip I of the sensing lever Or latch. I80, forcing the said lever downwardly, thereby likewise carrying downwardly the depressor bar I2" through its connected'arm I20, the movement now being continued by the pull of'spring 21. The downward movement continues sharply until the lower edge of depressor bar I2." strikes the lug I28a of the key depressed and snaps the key to the limit of its stroke against the casing. A. The spring 21 is more powerful than spring I3I at the left end of. the. depressor bar:- and easily overpower-s the latter; Thus, it will be seen that the touch of the key IIID" merelystarts the action which releases theselector, theforce. of; the selector spring pullingthe cam 9'I" overthe sensing lever I05, forcing said lever-down, snapping the depressor bar down: and pullingathe key .with it for the completion of its, stroke. The distance between the lower edge of the depressor bar I2" and the lug i 28a: of the key varies rwith thevalue. of the key, so that when the depressor bar is arrested in its downward movement, it alsoiarrests the lever I00 in a corresponding position on the cam 91".

Actuation of the number one key (to the left in FigurelG) will cause the bar I2? to move downwardly a short distance during which movement surface IZQa engages lug I28a, unlatching selector, 26 as heretoforedescribed, and at the same time; releasing'latch I09 causing the selector to move: forward unit, distance until the cam 91 thereof engages lip IIIe'if at a point adjacent the high point of the cam 91 and to register the numeral: 1 in the correspondingaccumulator dial. Similarly, actuation of the'number 9 key (to the right in Figure 16) would displace latch I00 nine times the distanceit was depressed by the-number one key, carrying lip I90 with it, so that when theselector 26 moves forward the cam surface-91" will be stopped by lip; lilllf at the'lower point of: thecam, registering the number 9 in the corresponding accumulator dial. The space on cam- El is calibrated equally between these points corresponding to the number of keys to control the respective positions where the cam 91 engages lip H39 when any of the remaining corresponding keys are depressed. In other words, each: key-from: 1 to 9 establishes a different or stepped. relationship between the cam surface 9] and lip IfiOf'.

If it is desired to repeat any number-indicated by the'key operated, 1e lever 504' is pulled in the direction of the operator, pivoting bail IIIIb' about its pivotal axis IT and causing the cam notch IIl Id to'be' pulled into the bail by spring IBM, thereby permitting the edge IIIIc to engage in the tooth, of rack mile which faces it, looking latch nose Illllf' at its arrested point on cam 91". As the edge IIlIc' moves in the direction of the rack Illlle it engages the lower arm I2 lb of latch I2 I, pivoting thelatch around pivot IZIa, thereby disengaging. notch I2I from lip I2Ilc, releasing the depressor bar for return to its normal position by tension spring I3I. It will be understood, of course, that when latches IZI and I00 moved downwardly, as described above, the rack IllIle" was depressed a distance equal to the number of teeth represented by the key depressed bringing, for example, tooth No. 5 into position opposite pawl edge IIJIc' if the key having the digit 5 was operated. At this time, if it is desired to repeat, or multiply this number, it may be done by repeat operation of operating bar F as described in connection with Figure 3.

To restore the mechanism, to its starting position the bar F should be depressed, so that bail 34 may return. the selector bars. The bar F is held. down momentarily, during the last repeat cycle, while lever I04 is pushed away from the operator or to the right as seen in Figure 16, so that bail IOIb' may, ride out of notch IIM'd and upwardly along the cam surface thereof Withdrawing knife edge IIlIc' from rack IOIle' thereby permitting the sensing lever and latch assembly I00, I2I to snap upwardly under the tension of spring IOIla. At this time the notch I2 I of lever I2I will snap over lip I20a of arm I20 to lock the sensing lever and latch assembly to the depressor bar.

t will be noted that in this modification, Figure 16, the indicator dials 98 are interposed between the selector bar rack and dial gear 28'. The interposition of this gear, of course, reverses the direction of rotation of the accumulator dial gears 28' so that they rotate clockwise to subtract and counter-clockwise to add instead of the reverse, as explained in connection with Figures 3-12, inclusive. Therefore, with this modification, it is necessary to reverse the direction of rotation. of shaft 40 of the carrying mechanism, which may be done in any well known manner.

In Figure 19, the mechanism shown in Figure 16 is combined with a novel form of printer for printing amounts or totals. In this form of the repeat mechanism each latch IOIl' has a forward extension I32 along. its forward edge with a gear rack I33 cut into the free edge of the extension. A shaft I34 is fixed to the sub-side frames of the machine as shown in Figure 20, and printing segments I35 are pivoted thereon for swinging movement. Each printing segment has teeth I35a which mesh with teeth I33 and carries printing type 20a on its, lower edge. It will be obvious that vertical movement of latch IIlO' will rotate the printing segment so as to present the type of any number, corresponding to the key operated, on or over the printing platen Ill. The platen 91' is supported by a pair of oppositely disposed angle irons I36, only one of which is shown in Figure 19, which pivot on shaft 11'. Asmall plate 94 is fixed to the vertical side of the angle iron I36 and is provided with a cam surface 941).

This printing mechanism is controlled by the actuation of operating bar F and extension thereof 3e pivoting around 3Ia. A dog is pivoted to the sub-side frame at 85 and normally locks into engagement with pin I3I projecting from the side of angle iron I36. A link 32 connected to extension 30 has a pin 69 projecting from the side thereof into the path of cam 94?). A small angle plate I38 having a bent p 82 is pivoted at I39 to the inner side of link 32 in such a position that it engages the dog 85'. At its forward end the plate I38 has an upwardly extending lug I38a to which a spring I40 is secured, the other end of the spring being. fastened to link 32. A small pin MI is fixed in the link 32 to prevent the plate I30 from swinging over on its pivot in a forward direction.

To operate the printing mechanism, the operating bar F is partially depressed, moving link 32 rearward, or to the right as seen in Figure 19, immediately causing lip 82 to unseat dog 85 allowing platen ill to snap upwardly against type 20a under the pull of tension spring 93. Continued downward movement of operating bar F causes pin 69 to ride up over cam 94b, thus forcing the platen 9I to return to its starting position. As the platen and its supporting arms I36 move downwardly, spring 88 reseats dog 85 over its pin I37, locking the platen in its lower position. When operating bar F is released and link 32 moves forward, or to the left as seen in Figure 19, the lip 82 of plate I38 will engage the bevelled end edge of dog 85 and will slip under it, pivoting on point I39 under the tension of spring I40, and the lip will resume its starting position under the dog 85.

An advantageous feature of the printing mechanism shown in detail in Figure 19 is that once the desired keys have been depressed and the selectors advanced to the point where they are cammed against lip I00f, the operating har F is relieved of the weight and drag of the print ing segment I35. If, for example, any key 5 were depressed the corresponding selector would be projected rearwardly until cam face 91 was stopped by lip I001. The downward movement of latch I00 rocks printing segment I35 about its pivot to present the type number 5 over the printing platen. With the lever I04 set to lock knife'edge IOIc into rack I006 the segment would then be held in that position during all repeat operations, thus lightening the load on the operating bar F, and speeding up its operation. This construction also eliminates the possibility of error occurring through an overthrow or under throw of the printing means which might result from fast, repeat movement of the operating bar.

Another feature of the feedback and shifting mechanism in association with the check dials 98, as shown in Figures la and 16, is that any value carried in the repeat mechanism is always reflected in the check dials 98, whether carried in the accumulator or not. As the dial 98 is always in mesh with the rack of the selectors (Figure 16) any total carried in the feedback mechanism will always be reflected in these check dials. One advantage of this occurs when a stylus keyboard is used, so that it is easier to read what has been recorded in the machine. Even with a conventional keyboard, the check dial affords a convenient manner of reading at a glance what has been recorded in the machine.

The number shown in the check dials may be shifted from one side of the machine to the other in a manner similar to the shifting accomplished as hereinafter described in connection with this feedback mechanism.

In order to feed any amount carried in the accumulator back to the repeat mechanism shown in Figure 16, the total lever I0 (Figure 1a) is 20 pulled in the direction of the operator. Link I2, Figure 16, functions in the same manner as link I2, Figure 4. On actuation of the totalling lever (not shown in Figure 16) link I2 moves to the right as shown in Figure 16 until stud 12a engages arm IB of arm I6 which forms part of a bail I8. Bail I8 (Figures 16 and 19), rests on shoulder I000 of lever I00 (Figure 16) and is forced downwardly by this movement, pulling latch I00 (Figure 16) or I00 (Figure 19) with it, releasing the selectors. It will be obvious from the construction that lever 66 will be actuated by stud 12d, pulling the dials into mesh with the selector racks before stud 12a engages I6 (Figure 4) or stud 12a engages 16 (Figure 16). This rocks the accumulator dials into mesh with the selectors and releases them from lip I00) for rearward movement, clearing the accumulator dials, at the same time picking up the amounts carried in said accumulator dials and camming said amounts into latches I00 (Fig. 16) or I00 (Fig. 19) of the repeat mechanism. Pulling lever I04 toward the operator locks these amounts in the repeat mechanism so that they may be repeated if desired, and in the manner heretofore outlined. They may be repeated in the same denominate column or may be shifted to another denomina tion, according to the need of the situation, as outlined in the shifting mechanism about to be described.

Shifting mechanism When the machine is used for calculating, a mechanism for shifting the dial accumulators is provided as shown in Figures 12, 13 and 14. A pair of shafts 31, 31 are fixed in the side frames of the machine and extends across the same. A pair of oppositely disposed plates H2, II! are mounted for lateral sliding movement on shafts 31, 31', these plates being tied together by rods 53, 55, and 38, thereby forming a carriage. The rod 38 carries collars 38a, fixed thereto on the inside of the plates H2, H2 so that the rod will shift with the carriage. This carriage supports the dial assemblies 28 and the pawls 54 which look them against involuntary rotation. A shifting handle I I 3 is fixed to plate I I2 of the carriage in any convenient manner and is spring pressed and arranged to cooperate with a perforated and slotted plate I I4, whereby shifting may be accomplished by depressing the handle H3 and sliding it along said plate I I4 as many spaces as it is desired to have digits or decimal spaces in the result sought. Calculating or multiplication may then be accomplished through the keyboard or stylus board as heretofore described, the manner being well known in the art.

Instead of having the shifting mechanism adjacent the dials, as shown in Figure 12, it may be positioned at the front end of the machine, below the keyboard as shown in Figure 20. In this view the sub-side frames 39, 39a are fixed to the base of the machine and are otherwise supported by tie rods 99, 99a and shaft I34. Between these fixed sub-side frames and slidable on the tie rods a pair of spaced sub-side frames IIZ, IIZ' are mounted, these frames being fixed to shaft I34 by means of collars I42 fixed to said frames and having appropriate set screws or pins to secure them to the shaft so that they may be shifted therewith in a unit as a carriage. The several printing segments I35 are pivoted on shaft I34 (only one being shown) suitably spaced from each other by any appropriate means, each engaged with a corresponding latch assembly and selector bar as shown. An arm iIZa carrying the shifting butaevenee to which this button isattached; is secured to the shifting carriage, by depressing the button and moving it to the'left as seen, in'Figure' 1a; the: carriage: comprising plates H2, IIZ, with the printingsegments I35 and latch'assemblies there between, may be shifted as many spaces as'the capacity of the machine will permit; In dividing with, this machine lever tit-would have to be depressed or pusheddownwardly at'every'cycle' toset themachine forsubtraction, as previously: explained, before the depressed" bar F" is released. When this. is done, stud 69in returning-to the Fig. 3 position after release of bar F displacesleverfifi counterclockwise slightly toride under cam lip 68c, this displacement being'accommodated by. the form of the camnotch at 66a in lever 66 without releasing shaft 38-.

When the shift is completed, the operating bar may bereleased- As a substitute for the lip IIlllf whenit'is shifted, an arm IflIjf" (Fig. 20) which is fixed to the movable plate II2 moves with latches II!!! when it. is shifted and army IflI'f slipsinto the notch. 91 to hold the selector or selectors as required when bar' F is released.

When there are less printing segments I35 or latch mechanisms-I01" (Fig; 16) than thereare selectors, theplate I I2" (Fig..20) wouldicarry an arm similarto arm I'0I=f,. but extending in the opposite direction, to hold the leftmost or outboard. It is understood in theart that as:

selectors. many additional selectors v are placeditothe left of the keyboard'as itisdesiredto have decimal Thus, as shown in Figure 1d, for example; five additional. selectors are provided to theleftof the keyboardsoithat.

spaces or whole numbers.

we may shift five spaces or digits to the left;

Keyboard. mechanism A keyboard may be substituted for the stylus board without substantial changes inthe machine; As shown in Figure 15, a selector 20", having a stepped cam 91' is substituted for the selector 20, and an arm I2" pivoted at I201. is substituted for the depressorbar I2. A keyboard having up per and lower plates I01, I03 is supported by 19a extending fromthe side' cross-bars I 839,

frames of the machine. Keys Ilil are supported by these plates with their shanks I Illa extendingtherethrough. Compression springs III are connected to their shanks and the mechanism is so disengaging dog IIHc from rack lime. The dog is 1 maintained in disengaged position in this form of theinvention because the lever Iflli is in constant engagement with the cam 9'! (Figure 15) whereas in Figure 3 it'is not. In Figure 15, the

dog I1 is eliminated. When akey is-depressed the 22 downwardly extending arm of thebar' l2 drops I00 a distance equal to the depth of steps on the camrequired'to stop the selector according to the key depressed. The spring 21 (not shown in Figure 15) pulls the selector to the right as soon as I013 is released. from the first step of the cam.

The remaining mechanism for controlling lever H18 is identical with that shown in Figure 3 whi'chhas already been described.

In the operation of the keyboard, actuation of a key will cause it to strike depressor bar I2, which willsw-ingon pivot I211, causing its free end which it L-shaped in side elevation, to strike stud I00" sliding the lever downwardly a distance sufiicient to release the selector bar so that it can snap to the rights; number of steps indicated by the digit onthe key depressed; It will be noted that the keyboard mechanism is so constructed and arranged that the actuation of a key will release the corresponding selector for re-engagement with lever- I00 at a step on the cam 91 corresponding to the digit on the key depressed.

In this modification, the dial indicator mecha XllSlll 98' for the keyboard is mounted on shaft I211 but it founctions in the same manner as indicated with respect to Figure 3.

Where used in the specification the words keyboarc and stylus board and key and stylus will be considered synonymous unless the context indicates otherwise.

While the foregoing drawings and description.

illustrate and describe preferred embodiments and modifications of the invention, these are not to be construed as limited to the construction shown, but the invention is to be given an interpretation commensurate with the scope of the appended claims.

I claim as my invention:

1. In a computing machine or the like, in combination, a keyboard, a denominational series of spring impelled selectors controlled thereby, means for locking said selectors in normal position, each selector being released from said locking means for movement from normal position upon actuation of a key of corresponding denominational order, means for restoring said selectors tonormal position including an operating bar, a stop member connected to each selector and synchronous in movement therewith, each stop member being contoured to control stopping positions for said'selector of the order of from one to nine to correspond to the keys of the keyboard, a differentially adjustable latch means for each selector for engaging said stop member on the movement of the selector to limit the stroke thereof in accordance with the key operated, key actuated means for releasing said locking means, said key actuated means controlling the movement of said latch meansto a differentially adjusted position, a printing segment pivoted adjacent each said latch means and connected thereto for concurrent adjustment when the latch means is differentially adjusted, a platen yieldingly mounted for swinging movement beneath said segments, and means operable by said operatingv bar for swinging said platen against the printing segments upon actuation of said operating bar.

2. In combination in a computing machine or the like, a keyboard, a denominational series of spring impelled selectors releasable for movement from normal position under spring tension by operation of the respective keys of said keyboard, each selector having a stop member thereon graduated in steps corresponding to the number of keys in the respective keyboard order, spring

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