US2459441A - Computing machine - Google Patents

Description

Jan. 18, 1949.

w. E. LIPPERT 2,459,441

COMPUTING MACHINE Filed Dec. 20, 1938 6 Sheets-Sheet 1 INVEINTOR WALTEQ E.| IDDEQT Jan. 18, 1949.

w. E. 'LIPPERT 2,459,441

COMPUTING MACHINE INVENTOR WALTER ELLIPPERT Jan. 18, 1949.- w. E. LIPPERT COMPUTING MACHINE Filed -Dec. 20, 1938 6 Sheets-Sheet 3 INVENTOR WALTER E.L| m: RT

ATTORNEY Jan; 18,- 1949. w, -r 2,459,441

COMPUTING MACHINE Filed Dec. 20, 1938 6 Sheets-Sheet 4 INVENTOR WALTEQ E.| l DPERT W. E. LIPPERT COMPUTING MACHINE Jan. 18, 1949.

Filed Dec. 20, 1938 6 Sheets-Sheet 5 A INVENTOR WALTER E.| IDF EPT ATroRNEY 2 Jan. 18, 1949. w, UPPERT 2,459,441

COMPUTING MACHINE Filed D90. 20, 1938 6 SheetsSheet 6 INVENTOR Patented Jan. 18, 1949 COMPUTING MACHINE Walter E. Lippert, Jackson Heights, N. Y., as- Corporation, a corporasignor to Underwood tion of Delaware Application December 20, 1938, Serial No. 246,856 1 Claim. (Cl. 235-60) This invention relates to computing machines, and more particularly to mechanisms for obtaining true negative totals from a single adding and subtracting totalizer.

It is well known that to obtain'such a total on the type of machine illustrated here, it is necessary to introduce a quantity known commonly as a fugitive 1. This fugitive 1 may be introduced in different ways, the one being employed in the present instance operating as follows.

Whenever the totalizer is shifted from its adding position to its subtracting position, 1 is subtracted, and whenever it is returned from its subtracting position to its adding position, 1 is added. By doing this, if a total is taken when the totalizer is in its subtracting position (as is always the case in taking a negative total), the fugitive "1 is properly subtracted without any attention on the part of the operator.

It is also well known that to obtain a negative total without special attention on the part of the operator, it is necessary to have the shifting of the totalizer to its subtracting position controlled automatically by the totalizer (according to its positive or negative condition), this automatic control of the shifting being customarily per formed during a blank cycle immediately following the entry of the last item.

In mechanisms of this character it is therefore necessary at times (when the last item was a positive entry, but the total is negative, or vice versa) to shift the totalizer during the blank cycle, the shifting incidentally causing the entry of the fugitive 1.

In many types of machines, the entry of a fugitive 1, or in fact the entry of any amount, may leave the actuating racks or transfer mechanism, or both, in a condition that is not proper for taking a total. It is, therefore, necessary in such machines to operate the machine through a second blank cycle before the total can be taken.

This requirement of two blank cycles prior to the taking of a total has been found very objectionable, especially in types of work necessitating the taking of totals at frequent intervals. It is, therefore, an object of the present invention to relieve this condition by providing a mechanism that will properly condition machines of this character for the taking of a negative total after one. instead of two blank cycles.

With this and incidental objects in view, the

invention consists in certain novel features of construction and combinations of parts, the essential elements of which are set forth in appended claim, and a Preferred embodiment of which is hereinafter described with reference to the drawings which accompany and form part of the specification.

In the drawings:

Figure 1 is a perspective view of a computing machine embodying the invention,

Figure 2 is a diagrammatic view of the keyboard thereof,

Figure 3 is a right side elevation of the totalizer and the fugitive "1 entering mechanism, showing the position of the parts immediately following the insertion of the fugitive 1,

Figure 4 is a view similar to Figure 3 but with the parts restored by certain restoring mechanism that is operable at the beginning of a total cycle,

Figure 5 is a right side elevation showing the totalizer engaged and the train of mechanism for momentarily disengaging the totalizer at the beginning of a total cycle,

Figure 6 is a view similar to Figure 5 but with the parts shown operated and the totalizer disengaged,

Figure 7 is a fragmental perspective view of the mechanism for automatically conditioning the totalizer to take a negative total,

Figure 8 is a fragmental perspective view of the rack and pawl restoring mechanism operable at the beginning of the total cycle, and showing the connection between this mechanism and the blank cycle enforcing mechanism, and

Figure 9 shows a portion of a tally strip illustrating the type of work accomplished by the machine.

GENERAL DESCRIPTION The invention is herein exemplified in connection with mechanism of the general character disclosed in the U. S. Patents No. 1,198,487, issued to Gustaf D. Sundstrand, and Nos. 1,583,102, 1,965,611, 2,004,495 and 2,088,982, issued to Oscar J. Sundstrand.

On this class of machine, accumulating operations are performed by indexing in the keyboard the amount that is to be listed and accumulated, and starting the machine by depressing the Motor bar. Stops set by the amount keys arrest the type bars during their upward movement in positions wherein the numeral type corresponding to the amount indexed is in position to print. Adding and subtracting racks carried by the type bars are arranged for movement therewith.

Prior to the up-stroke of the racks in an accumulating cycle, the totalizer is moved to a neutral position intermediate the two sets of racks, and

just prior to the down-stroke of the racks the totalizer is engaged with whichever set of racks is to be used in the accumulating operation.

An enforced blank cycle prior to a total cycle insures the resetting of any transfer pawls which may have been tripped during the preceding accumulating cycles, and automatically engages the totalizer with the proper set of racks in accordance with the positive or negative character of the total to be taken.

During the total cycle, the totalizer wheels are in mesh with the selected set of racks during the up-stroke of the latter. Therefore, as the transfer lugs carried by the wheels abut the under side of their associated transfer pawls, their corresponding type bars are arrested in position for printing the totals which have been accumulated in the totalizer.

Since an error of 1 occurs whenever the totalizer overdrafts, a means must be provided to correct this error. tumbler arranged to be oscillated alternately clockwise and counter-clockwise, as the totalizer shifts from one set of racks to the other. Such movement of the tumbler causes it to trip a pawl associated with the units order rack of the set of racks engaged, whereby the units rack is permitted to descend a distance of one tooth to additively or subtractively accumulate, as the case may be, the fugitive l in the units wheel.

In the ordinary course of operations, this accumulation of the fugitive 1 trips one or more transfer pawls and actuating racks that are not restored until the next cycle. Further, it may happen that the amount of the last item of a group to be totaled is of opposite character to, w

and less than the aggregate amount of the preceding accumulated items. Under such a condition, when the machine is operated through the blank cycle to condition the totalizer for taking a total, the movement of the totalizer from one set of racks to the other causes the fugitive 1" pawl to trip and thereby introduce the necessary fugutive 1 as in the normal course of operations, but, since the entry of the fugitive 1 leaves one or more parts out of normal position, another blank cycle is necessary before the total can be taken.

To obviate the necessity of two blank cycles before taking a total, there is provided an independent rack and stop pawl restoring means. means is arranged to be controlled by the mechanism for enforcing the blank cycle, and upon operation of the latter, the means becomes effective to disengage the totalizer from the racks, raise the descended units rack, restore the associated stop pawl, and re-engage the totalizer at the beginning of the ensuing total cycle. Hence, the accumulation of the fugitive 1 is completed at the very beginning of the total cycle, and before the type bars have started to rise.

DETAILED DESCRIPTION INDEX or TOPICS The machine sections and actuating mechanism generally. Mechanism for shifting the totalizer. Transfer mechanism generally. Fugitive "1 entering mechanism. Mechanism for enforcing a blank cycle prior to the taking of a total. Automatically conditioning the totalizer for taking a negative total. '7. Mechanism for restoring racks and stop pawls at the beginning of a total cycle.

a: unaware This means includes a This 1. The machine sections and actuating mechanism generally Referring to Figures 1 and 2, the machine includes the usual keyboard I having amount keys 2, a Subtract key 3, Non-add key 4, Total key 5, a carriage 6 supporting a, platen 1 around which the paper is guided, type bars 8 for printing on the paper, a motor 9 and a Motor bar [0.

Type bars 8 are suitably guided for vertical movement and are individually raised and lowered by arms H (one being shown in Figure 3) carrying headed studs that lie in elongated openings l2 in the type bars. The arms H are pivoted on a shaft l3, and have springs such as M connected to their rear-most ends to raise such of the bars as are free to rise as the machine operates. A rod I extends transversely across the forward ends of arms H and is arranged to control the upward and downward movement of the type bars through the action of cam plates such as it connected to the opposite ends of rod 15. Each cam plate l6 has a cam slot l'l into which projects a stationary roller I 8 secured on the machine side wall. The rear end of each plate I6 is provided with a recess 19 in which lies a roller such as 20 mounted on stud 2| fixed in a lever 22 pivoted on a stationary stud 23 secured in the machine frame. Links such as 23 are connected to studs 2! and studs such as 24, fixed in the crank arms 25 secured to an actuating shaft 26.

The machine is actuated by a motor 9 (Figure 1). The motor is started by the closing of a suitable switch, and is coupled with the actuating shaft 26 by a suitable clutch upon depression of Motor bar In. The actuating shaft is coupled with the motor drive in such manner that it is rocked, first, counter-clockwise (Figure. 3) and then clockwise, about during each cycle of the machine. Hence, as crank arms 25 swing upwardly during the first part of the cycle, levers 22 are swung clockwise about studs 23, and cam plates IS in turn are moved upwardly, raising rod 15 and thereby permitting arms H to raise type bars 8 under the tension of springs I4. During the second half of the cycle, as crank arms 25 swing clockwise, a reverse movement of the parts takes place, i. e., levers 22 are swung counterclockwise, cam plates I5 are moved downwardly, pulling rod l5 downwardly and thereby restoring the type bars. The foregoing train of parts and their operation is identical with the similar parts disclosed in the aforementioned Patent No. 1,965,- 611, except that the upper portion of cam slots H are provided with longer dwells than the cam slots 33 in cam plates 32 of that patent, whereby type bars 8 are delayed somewhat from upward movement at the beginning of the cycle for a purpose which will hereinafter be explained.

Each type bar 8 carries a pair of depending actuating racks 21 and 28 (Figure 3) lying on opposite sides of a totalizer indicated generally at 29. The totalizer includes a plurality of wheels 30 journaled on a shaft 3|. Shaft 3! is arranged to be shifted horizontally to engage wheels 30 with either of the sets of racks. Racks 21 are effective to rotate the Wheels in a clockwise direction for accumulation of additive amounts, while racks 28 rotate the wheels in a counterclockwise direction for the accumulation of sub tractive amounts. Normally, the wheels are engaged with adding racks 2 When an item indexed on keys 2 (Figure 1) is to be added, wheels 3 are moved to neutral position (shown in Figure 4) between the two sets of racks, before type bars are raised to print the item. The. wheels are moved back into engagement with racks 21 just before the bars are moved downwardly. Addition, therefore; is accomplished" on the downstroke of the racks. The extent of rotation of wheels 34] is controlled by the extent of riseof the type bars in accordance with the amount indexed.

Depression of Substraction key 3 following the indexing of anitem causes the wheels to be moved from neutral position into engagement with subtraction racks 28 just before the latter descend, whereby subtraction of the item is accomplished' on the down-stroke;

To take atotal, the Total key 5 is depressed and the machine operated. During this operation, wheels 30 are engaged with the set of racks selected during the blank cycle preceding the total cycle, so that during the upstroke of the racks, the total is cleared from the wheels. They are withdrawn from engagement with the racks just before the racks descend, and are r-e engaged at the very end of the operation.

Depression of Non-add key 4 causes wheels 30 to be held in neutral position during both the ascent and descent of the racks, so that an item may be printed without accumulating it on the totalizer;

All of the before-mentioned features are com mon to the Sund'strand patents mentioned in the foregoing (with the minor exception of cams I6 herei'nbefore noted) and to which reference may be had for a more detailed description,

2. Mechanism for shifting the totalizer The mechanism for moving Wheels 30 into and out ot mesh. with racks 21. and 28 to accomplish the operations above outlined, is identical with that disclosed inthe No. 1,965,611. A pair of links, such as 32' (Figures 5; 6 and '7 are pivoted at their forward ends to the opposite ends of shaft 3|. The rear ends of links 32 are pivoted as. at 33 to the lower ends of two levels. such. as 34, fixed to a shaft 35 journaled inthe framework or the machine. When levers 34v are in the position shown in Figure '7- (only the right lever being shown), wheels 39: are in mesh with adding racks 21.

The means for swinging levers 34 to move the 7 wheels into andout. of mesh: with the racks comprises a link 36 (Figures 5', 6- and- 7 the forward end; of which is supported by a lever 31- pivoted onastud 38. The rear end of link. is provided with notches 3% and; to receive respectively, on the opposite endsof the right handv lever 34. Rearwardly ofnotches 39' and 40 are lugs 43 and 44, respectively, which serve to prevent disengagement-of lever 34 from link. 36. Forwardly of notches faces arranged to slide in contact with pins 4i and 4-2; Link 36 is moved forward and back by a cam plate 45 (Figuresfi and 6) having a cam slot. 46 therein, the upper portion of the slot being concentric with the axis 41 of the plate. The forward end of link 36 carries a roller 48 that lies in. slot 46. Cam 45: is oscillated about its axis 47 on eachcycl-e of the machine by a reversible pawl mechanism (not shown) having connection with actuating shaft 26 (Figure 3 as fully disclosed in Patent No. 1,965,611.. By provision of the above mechanism, as cam 45 swings upwardly during the first half. ofthe cycle, link 36 is drawn forwardly, and levers 34 are swung clockwise about. shatt 35 as viewed in Figure 7, whereby previously mentioned Patent pins 41 and 42.

39' and 40 are curved surwheels 34 are withdrawn from engagement with racks 21 before the latter rise; and when cam 45 swings downwardly, during the latter half of the cycle, link 36 is thrust rearwardly, whereby levers 34 are rocked counter-clockwise of shaft 35, bringing wheels 39 into engagement with racks 2'! before they descend.

Link 36 is connected with Subtraction key 3 by a lever 49 (Figure 7) pivoted on the machine frame at 50. Lever 49 is provided at its rear end with a recess 5! embracing a pin 52 on link 35, and has a downwardly extending arm carrying a pin 54 that lies in a slot 55 in a slide 56. A spring 51 connected between slide and lever 49 normally tensions the pin against the rear end of the slot. The forward end of slide 56 is pivoted to a depending arm of a lever 55 pivoted on a stud 59. Lover 58 has a forwardly extending arm 60 underlying a pin fixed in a plate 32. secured to the stem of Subtraction key 3. A spring connected between plate 62 and the machine frame normally tensions key 3 upwardly, and a spring 54' connected between. the lower arm of lever and the machine frame normally tensions the lever clockwise about stud 59 so that arm 69 rests against pin 6!. When the parts are in the normal position shown in Figure '7, tension of spring 64 urges slide 55 forwardly and causes lever 49 to hold notch 4U 01 link 36 in engagement with pin 42.

When an amount is to be subtracted, depression of key 3 rocks lever 58, which in turn thrusts slide 56 rearwardly, moving the rear end of slot 55 away from pin 54 and tensioning lever 49 upwardly.

Now when levers 34 are rocked clockwise at the beginning of the cycle, notch. 39 is brought opposite pin 4|, whereupon lever 49 thrusts link 36 upwardly, engaging notch 39 with pin 41 and disengaging notch 40 from pin 42.

Hence, as cam 45 (Figure 6) rocks downwardly at the beginning of. the second half of the cycle, levers 34 are rocked further clockwise about shaft 35 instead of counter-clockwise, engaging wheels 30 with subtraction racks 28 (Figure 5) instead oi adding racks 21.

A latch indicated at 65 (Figure '7) is provided to maintain lever 58- and. its associated parts in operated position to eiTect this result. At the completion of the cycle, latch 65 is released, allowing the parts to return to their normal positions.

If, on the ensuing cycle, key 3 is again depressed, wheels 30 are disengaged from racks 28 at the beginning of the cycle and remain in such position during the ascent of the racks, re-engaging the racks just before the descent thereof. If key 3 is not. depressed, link 36 ceases to be tensioned upwardly. Hence, at the beginning of this cycle, notch 40 re-engages pin 42 as notch as disengages from pin 4!, whereby wheels 39 are engaged with racks 27 instead of racks 28 during the last half of the cycle.

As described in Patent No. 1,965,611, the reversible pawl mechanism (not shown) does not disengage the totalizer at the beginning of a total" taking cycle. The totalizer, therefore, remains engaged (except for a brief interval later referred to) with the set of racks with which it was left. engaged at the completion of the blank cycle, to set up the total on the type bars and return the. totalizer to zero. At the beginning of the second half of the cycle, the totalizer is final total is dedisen'gaged from the racks if a sired, and is again engaged at the very end of the cycle. If a sub-total is desired, the totalizer is allowed to remain engaged during the entire second half of the cycle.

3. Transfer mechanism generally Referring to Figures 3 and 4, the sets of racks 21 and 28 are connected to type bars 8 by individual pin-and-slot connections that permit one step of downward movement of each rack relative to its type bar. The racks are guided for vertical movement in slots 66, formed on inwa'rdly facing surfaces of a pair of similar bars 61 which extend longitudinally of the totalizer and which are supported in the machine frame.

Each rack is provided with a lug 68 which moves in the vertical plane of its respective bar 61, and which is arranged to be arrested by the bar to define the lowermost position of the racks.

Two rods 89 are supported in the machine frame at opposite sides of the two sets of racks, and operatively support a plurality of stop pawls 18, one such pawl being provided for each rack. Each pawl Ill is formed with a lug arranged to co-act with lugs 68 on their respective racks, to support the latter one step of movement above bars 61. To the lower end of each pawl 10 is pivoted a dog H, having a tooth l2 engaging the edge of the adjacent bar 61.

Each of the wheels 30 has two diametrically opposed lugs 13 fixed to one side thereof (see also Figure '7) and which are arranged to disengage the teeth 12 from the bars 67. Vfhen an amount registered by a wheel reaches nine, continued rotation of that wheel as its rack descends brings one of the lugs 13 against the upper edge of the end of the dog H associated with the next higher order rack, thereby depressing the dog until its tooth i2 is clear of the bar 51, whereupon a spring 14 (assisted by the downward pressure of a spring I of the said next higher order rack) moves the dog and pawl m away from the higher order rack, the latter then being free to drop the one tooth space, where it is stopped by contact of its lug 68 with bar 61.

Any transfer elements that are tripped during one cycle of the machine are normally restored during the next cycle. The pawls l0 and dogs H are restored by a pair of rods 15 lying adjacent the dogs H. two bellcrank levers, such as 16, pivoted on rods 69. The beilerank levers are connected for simultaneous swinging movement by a pin-and-slot connection #1. The rods 15 are simultaneously moved toward and away from their associated dogs 7! by operation of two arms, such as 78, that are formed integrally with the right hand set oi. bellcrank levers 16. A rod 19, lying in the transverse plane of arms 18, is arranged for downward movement (as indicated by arrow) during the first half of each machine cycle. Such downward movement of this rod causes it to abut arms 18 and thereby rock bellcrank levers IS about their pivots to swing rods 15 inwardly, as shown in Figure 4, to restore any pawls 16 and dogs II that have been tripped. This restoring action takes place at a point in the machine cycle where any dropped type bars will have been raised, so that their lugs 68 are above the lugs on pawls when the latter are restored.

This construction is common to the Sundstrand patents previously mentioned.

4. Fugitive "1 entering mechanism As previously stated, whenever a totalizer of Each rod '15 is supported by the type used in the present construction is changed from a positive to a negative condition, or vice versa, an error of 1 occurs. in the accumulated total. To correct this, mechanism is provided to enter 1 in the units wheel 3| every time the totalizer is shifted from the adding racks to the subtracting racks, or vice versa, so that when a, total is taken by one or the other set of racks, the fugitive 1 will have been entered. This mechanism includes a tumbler (Figures 3 and 4) which is rotatably mounted on shaft 3! immediately adjacent the units order wheel 30. Tumbler B9 is provided with oppositely disposed lugs 8|, arranged to engage dogs H that are connected with the pawls ll! associated with the units order racks 21 and 28.

A pair of stationary pins 82 are held by the machine frame on opposite sides of an upward extension of tumbler 86. Movement of the totalizer from engagement with subtraction racks 28, as shown in Figure 3, past neutral position, as shown in Figure 4, and into engagement with adding racks 2?, as shown in Figure '7, causes a beveled edge 83 on the tumbler to abut the right hand pin 82, and thereby cam the tumbler clockwise about shaft 3! a distance sufficient to cause lug 8! to release dog H from engagement with bar 6?. This allows the units rack 2! to descend a distance of one tooth to additively introduce the fugitive l in the units order wheel 36. Upon shifting totalizer 29 from engagement with adding racks 27, as shown in Figure 7, past neutral position and into engagement with substracting racks 28, as shown in Figure 3, a beveled edge 34, similar to 83, abuts the left hand pin 82, and thereby cams tumbler 8i} counter-clockwise about shaft SE, to cooperate with dog H in entering the fugitive 1 subtractively in the units order wheel 30.

A flat spring detent 35, suitably mounted in the totalizer frame, is arranged to engage spaced notches in the upper extension of tumbler 88 to hold the tumbler in either of its moved positions. It will be observed with reference to Figure 4 that the movement of totalizer 29 from engagement with either of the sets of racks to merely neutral position does not impart any movement to tumbler til, since this amount of movement of wheels 30 from either of the sets of racks is insufficient to cause either of the beveled edges 83 and 84 to be cammed downwardly by the stationary pins 82. The accumula tion of a fugitive l which has been introduced as above described is completed on the ensuing cycle when the tripped stop pawl iii and its associated dog are restored by the transfer restoring mechanism described in the preceding section.

5. Mechanism for enforcing a blank cycle prior to the taking of a total This machine is equipped with a mechanism similar to that described in the afore-mentioned Patent No. 1,583,102 for enforcing a blank cycle prior to the taking of a total. The purpose of this mechanism is to insure restoration of any tripped transfer pawls before the total is taken, and also to engage the totalizer with either the adding or subtracting racks in accordance with the character of the total.

The blank cycle mechanism comprises a detent plate 86 (Figure 8) guided to move forward and rearward in a horizontal plane, said plate being pivotally connected at 8'! to a frame 88. Frame 88 is mounted, for its limited swinging 9 Movement, upon a stationary rod 89 hired in the machine frame, and is normally urged for- W'ard by springs such as 90.

plate 91 pivoted in the machine frame at 02 is provided with a lug 93. A forwardly project'ing lug 94 on detent 86 is continually held in contact with lug 93 through the action of springs 90. Whenever any one of the numeral keys '2 is depressed to set up the first digit of an item, 'detent plate 06 is pushed back to prevent pins 95 carried by the type bars' ate the left of the set up number from rising. This result is effected by a lever 90 pivoted in the framework of the machine at 91, the front end of lever 96 bearing against a universal ball 98 arranged to be rocked by depression of any of the keys 2 by suitable connections similar to the one shown.

Detent plate 86 is held in its rearward position against the tension of springs 90 by a latch 99 pivoted at I and held in contact with plate 9I through tension of a spring I M.

During a blank cycle, a means for removing detent plate 8 6 from above the type bar pins 95 becomes eifective. This means comprises a lever I02 pivoted at I03 to plate 9| and having an extension I04 which lies in the path of a projection I05 fixed on one of the crank arms 25 on actuating shaft '26. When the extension I04 is struck by the projection I'05, plate BI is forced forward away from detent plate 86, thereby releasing the latter to the action of springs 90.

In order that projection I04 shall not release detent 86 to the action of springs 90 during the entering of an item, but only during a blank cycle, extension I04 is made movable into and out of the path of movement of projection I05, under control of amount keys 2 by the following parts.

An arm I06 of lever I02 is arranged to abut a lug I01 formed on a slide I08 through which the upstanding pins 95 of type bars 8 are guided. A spring I09 tends to move lever I02 in the direction to lower extension I04 out of the path of movement of projection I05. is in its initial position, extension I'04 is held up in the path of movement of projection I05. How ever, when a digit is set up by depression of a numeral key 2, the resulting movement of slide I08 (through suitable escapement mechanism not shown) allows extension I04 to be lowered by spring I09 out of the path of movement of projection I 05, so that plate 9| is not moved forward during that cycle. When slide I08 is returned to its initial position at the end of the cycle, however, extension I04 is raised into the path of projection I05 so that if the next cycle is a blank cycle, extension I04 is struck by projection I05 and moves plate 9| forward, allowing plate 06 also to move forward to condition the machine for the taking of a total.

This mechanism is substantially identical with that disclosed in Patent No. 1,583,102.

6. Automatically conditioning the totalieef for taking a negative total A mechanism similar to that disclosed in Patent No. 2,088,982 is provided in this machine to insure the engagement of the totalizer with subtracting racks '00 during the blank cycle, in the event that the totalizer has become overdrafted,

When slide mi upper arm of the bail has a universal connection with lever 22 whereby, as this level is swung to and fro about stud 23 during each cycle of the machine, it imparts a slight oscillatory movement to bail H0. The lower arm of the bail carries a yielding projection II2 arranged to lie directly in front of a. stud II'3 hired in slide 56, whenever the ball is elevated a slight distance on studs I I I. The means for so elevating bail H 3 comprises a bellcrank H4 pivoted on a stud H5 and having a horizontal arm I I6 underlying a pin I I1 secured to the bail. A vertical arin II8 of the bellcrank has an inturne'd flange l I9 that normally, during each cycle of the machine, abuts a stop lever I20 pivoted at I2I in the machine frame. A link I22 (N0. 1076 in Patent N0. 2,088,982) pivoted Oh a stud I23 secured in arm IIB has connected thereto a spring I 24 which tensions flange I I9 towere stop lever I 20.

The rear end of lever 520 is forked, and ernbraces a pin I25 fixed in an extension I 26 of a plate I27 mounted for pivotal movement on a rod I28 supported in the machine frame. The upper edge of plate $27 is embraced by a forked end of a link I29, which is connected by pin-and slot cohh'ectionswith arms 30 pivoted on rods 69. Each arm I30 is provided with a dog I3I similar to the dogs TI, and which are arranged to' be disengaged from bars 6! by lugs 73 of the totaliaer wheel 30 of highest order. v

A roller I32 on the lower end of lever 22 is arranged to bear against a flange I33 providedon arm H8 of bellcrank H4 and holds flange H9 21 short distance away from stop lever when lever 22 is in the normal position shown. When an amount accumulated in the totalizer represents a debit balance, the parts are in the position shown in Figure '7. However when the totalizer is overdrafted, the Wheel 30 of highest order passes through zero, causing lug 13 to trip dog I3I on the subtract side of the totalizer, and to swing arm I30 clockwise about rod 69 under tension of spring M. This movement thrusts link I29 toward the right as viewed in Figure 7, rocks plate I21 clockwise about rod I28, and swings stop lever I20 downwardly about its pivot I2I, out of the path of flange H9. Now, if a blank cycle is taken to condition the machine for a total operation, be'll'crank H4 is free to swing clockwise about stud II5 as roller I32 moves away from flange I33 at the beginning of the cycle. This permits arm I It to elevate bail i I0, bringing projection I I2 into the plane of stud I I3.

Clockwise oscillation of ball I I0 then causes the projection to abut stud H3 and thrust slide 56 rearwardly to tension lever 49 upwardly. Hence, when levers 34 rock clockwise following the above described movement of the parts. notch 39 of link 30 engages pin II in the same manner as previously described. Therefore, wheels 30 are placed in'- engagement with the subtraction racks 23 (Figure 3) at the beginning of the last half of the cycle, preparatory to the taking of the negative total on the succeeding cycle. At the end of the blank cycle, roller I32 strikes flange H53 and rocks bellcrank I' I4 counter-clockwise to its normal positlon.

Mechanism similar to that disclosed in Patent No. 2,088,982 is provided on the forward end of link I22 to prevent the link from coming forward when an amount is indexed in the keyboard, so that even though stop lever I20 is lowered out of the path of flange II9 by virtue of the presence of a. negative balance in the totalizer, the" latter will not be automatically engaged with the subtraction racks for the accumulating operation.

7. Mechanism for restoring racks and stop pawls at the beginning of a total cycle The automatic shifting of the totalizer from one set of racks to the other in accordance with the nature of the total to be taken occurs during the blank cycle as above described, and causes tumbler 39 to trip the fugitive 1 pawl of the set of racks engaged, to correct the error of 1 as described above. However, since this insertion of the fugitive 1, like an ordinary transfer from one order to the next, leaves one or more of the actuating racks and transfer dogs out of normal position, a second blank cycle must be taken before the total, unless some other means is provided to restore these parts.

A means to restore these parts without requiring the second blank cycle is provided in the present mechanism, and is rendered effective by actuation of the blank cycle mechanism, to restore the parts at the very beginning of the total cycle. In operation, this mechanism withdraws totalizer 29 from engagement with the racks, raises the descended units rack and any other racks which may have descended by virtue of transfer, restores their respective tripped stop pawls and re-engages the totalizer with the set of racks from which it was disengaged, at the beginning of the total cycle and before the type bars and racks start to rise to print the total.

The mechanism includes a lever I34 (Figure 8) pivoted on a stud I35 fixed on a plate I36. Plate I36 is pivoted on a stud I31 on the machine frame, and has a cam edge I38 against which rides a roller I39 secured on the left crank arm 25. A spring I46, connected between plate I36 and the machine frame tensions edge I38 against roller I39. During each cycle of the machine, crank arm 25 swings plate I36 upwardly raising lever I34. As crank arm 25 returns to its initial position shown in Figure 8, plate I36 restores under tension of spring I46, and lever I34 likewise descends to the position shown. A spring I4I connected between lever I34 and plate I35 normally tensions thelever clockwise (as viewed in Figure 8) about stud I35, and causes a hook I42 formed on the lower end of the lever to embrace one of the four pins I43. The upper end of the lever lies in the path of a projection I44 on detent 86. When an amount is indexed on amount keys 2 and detent 66 is thrust rearwardly, projection I44 strikes the upper end of lever E34 and rocks the lever counter-clockwise (as viewed in Figure .8) so that hook I42 is ineffective to engage pins I43. During a blank cycle, as detent 66 and projection I44 move forwardly, the upper end of lever I34 follows the projection under the tension of spring I4I, causing hook I42 to engage one of the pins I43. Pins I43 are fixed on a disk I45 secured on one end of a shaft I46 suitably journaled at its opposite ends in the machine frame.

A pair of four-point cams I41 and I48 are fixed on shaft I46 on opposite sides of a link I49 (Figures and 6), with their points arranged in offset relation as shown. Link I49 is provided with a slot I59 to accommodate shaft I46, and carries an inwardly projecting pin I5I arranged to be engaged by the points of cam I41, and an outwardly projecting pin I52 arranged to be engaged by the points of cam I48. The opposite end of link I49 is pivoted at I53 to a cam lever I54 loosely journaled on actuating shaft 26.

'12 Cam lever I54 is provided with a slot I55 embrac ing a roller I56 secured on cam plate 45.

When hook I42 is engaged with one of the pins I43, upward movement of plate I36 causes the hook to rotate shaft I46, During this movement, one of the points of cam I48 bears against pin I52 and thrusts link I49 toward the right to the position shown in Figure 6. This movement rocks cam lever I54 counter-clockwise to rotate cam plate 45 counter-clockwise, a distance sufficient to cause link 36 to withdraw totalizer 29 to neutral position as shown in Figure 6. It remains in this position for an instant, after which one of the points on cam I4! strikes pin I5I and moveslink I49, lever I54, plate 45 and link 36 back to their initial positions shown in Figure 5, to re-engage the totalizer with the set of racks from which it has just withdrawn.

This movement of shaft I46 occurs at the very beginning of the total cycle, and suiicient time is provided for its completion before the type bars are raised to lift the racks. This time is provided by provision of extra length in the d'well'in cam slot Il (Figure 3) in plates I6, as referred to in an earlier part of the specification.

While the totalizer remains momentarily in the neutral position as shown in Figure 6, a second pair of four-point cams I5'I (Figures 3, 4 and 8), secured on shaft I46, raise any dropped racks and restore any tripped stop pawls in the following manner. A pair of bails I58 and I59 (best shown in Figure 8) are pivoted on stationary rods I66, and each carries a transversely extending rod I6I located directly under the sets of racks TI and 28 at a distance beneath the racks sufiicient to permit one step of downward movement thereof. The inner ends of the bails are pivotally connected to each other by pin-and-slot connections. Bail I58 carries a pair of inwardly projecting studs I62 arranged to be engaged by the points of cams I51. A pair of arms I63 pivoted on a stationary rod I64 are provided with cam slots I65 embracing a rod I66 carried by bail I59. The upper ends of arms I63 have pivotally mounted thereon a pair of yielding projections I6? arranged to bear against therear stop pawl restoring rod I5 (see also Figure 3). While totalizer 29 is momentarily disengaged, during the 90 movement of shaft I46, a pair of the points of cams I57 bear against studs I62 and cam bails I58 and I59 upwardly from the position shown in Figure 3 to the position shown in Figure 4. This movement causes rods IE! to restore any dropped rack (rack 28 in Figure 3) so that its lug 66 is above the plane of the lower end of stop pawl 16. At the same time, arms I63 are rotated counter-clockwise as viewed in Figures 3 and 4, by virtue of their cam slot connections with rod I66, causing projections I6! to thrust restoring rod l5 inwardly toward the racks, as shown in Figure 4; to restore the tripped dogs TI and stop pawls 16. In this manner, the parts used in entering a fugitive l in the totalizer during a blank cycle are restored to normal position before the type bars and racks rise'during a total taking operation.

A spring pulled detent I68 (Figures 3 and 4) is pivoted at I6? in the machine frame, and carries at its lower end a roller I69 engaging notches in disk I45, to prevent improper rotation of shaft I46.

While the form of mechanism herein shown and described is admirably'adapted to fulfill the objects primarily stated, it is to be understood that it. is not intended to confine the invention to the one form of embodiment herein disclosed, for it is susceptible of embodiment in various forms all coming within the scope of the claim which follows.

What is claimed is:

In a calculating machine having cycling mechanism, totalizer, sets of actuators respectively at opposite sides of said totalizer, means for shifting the totaiizer into engagement with one or the other or said actuator sets and to a neutral position between them, a mechanism operable to effect tens-transfers by an extra step of moverient of said actuators, total-taking control means, and means operated by said cycling mechanism prior to total-taking for moving the totalizer to neutral position and restoring actuators that have been moved an extra step; the combination with the foregoing of supplemental means for restoring actuators that have been moved an extra step when the totalizer moves from one set of actuators to the other in conditioning' the machine for total-taking, comprising movable means positioned opposite the actuators, a rotatable member having cams, a connec- REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,649,478 Lansiedel Nov. 15, 1927 1,827,890 Horton Oct. 20, 1931 1,844,070 Muller Feb. 9, 1932 2,088,982 Sunclstrand Aug. 3, 1937 2,118,588 Butler May 24, 1938 2,261,242 Fettig Nov. 4, 1941

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