US2023298A - Manual zero-setting mechanism fob - Google Patents

Description

Dec. 3, 1935.

, C. F. AKEN MANUAL ZERO SETTING MECHANISM FOR REGISTERS Filed July 15, 1952 2 Sheets-Sheet l 3mm Carl FAken.

as, K

Dec. 3, 1935. c. F. AKEN 2,023,298

MANUAL ZERO SETTING MECHANISM FOR REGISTERS Filed July 15, 1932 2 Sheets-Sheet 2 ii -ni W 61mm,

gnu) fox Carl FAken.

" Patented Dec. 3, 1935 ("UNITED sr-ATEs aozazsa PATENT *orrica MANUAL znao-sarrmc pmcnamsu ron.

aaors'rans Carl 1'. Men, Brooklyn, N. Y., auignor, meme assignments, to Underwood Elliott Flaher Company, New York, N. Y., a corporation of Delaware Application July '15, i932, Serial No. 022,014 15 Claims. (Cl. 235-140 provide an efficient mechanism of relatively few parts for manually resetting the value indicating wheels of a two-way, or reversible, register to' zero-registering position after their movementin 10- either direction 'for adding or subtracting operations, as the case may be.

To the accomplishment of the above and ancillary objects presently appearing, a preferred embodiment of my invention has been illustrated l5 in the accompanying drawings, and will now be set forth'in the following description and defined in the claims appended hereto.

' In the drawings:

Figure l is a fragmentary view of a register ZU-iequipped according to my invention, with the right hand side plate of the register removed, the registering parts proper being shown in zero-indicating position and the zero-setting mechanism in normal position.

Fig. 2 is a horizontal section, drawn to an enlarged scale, taken axially of the numeral wheel or zero-setting shaft.

Fig. 3. is a detail view, partly in section and partly in side elevation, taken on the line 3-4 of Fig. 2.

Fig. 4 is 'a'view similar to Fig. 2, illustrating an intermediate stage of a zero-setting operation.

Fig. 5 is a perspective view of a portion of a zero-setting shaft and a combined pinion-and- 35 earn member forming part of the zero-setting mechanism.

Fig. 6 is a view in side elevation further .illus-' trating the same intermediate stage of a zerosetting operation, as in Fig. 4 and showing a zero-setting lever, a zero-setting segment, and cam members cooperating with the aforesaid combined pinion-and-cam member.

Fig. 7 is a similar view illustrating a final stage in the zero-setting operation. Fig. 8 is a fragmentary perspective view of the zero-setting segment and aforesaid cam members thereon.

Fig. 9 is a detail view in transverse section, taken on the line 9-9 of Fig. 8, of one of the cam members on the zero-setting segment, and illustrating the normal relation of said cam to the combined pinion-and-cam member of Fig. 5.

Fig. 10 is a similar view of another cam member on said segment, taken on the line Iii-l of -1 1 8.

Fig. 11 isa detail sectional view, taken on the line i|-ll of Fig. l, and illustrating a keeper device cooperating with one of the cam members on the zero-setting segment, and

Figures 12, 13 and 14 are,-'respectively, fragmentary views of the zero-setting shaft and one of a series of zero-setting dogs with which the shaft cooperates.

'- In the drawings, my invention has beenshown as embodied in a register of the type disclosed, for instance, in the co-pending application, Serial No.- 577,617, of H. A. Foothorap, filed November 27, 1931, although it is to be understood that the invention is susceptible of adaptation to other types of registers, as will presently become apl5 parent.

This type of register includes a closed register casing, including side plates I and 2, (Fig. 1) a series of denominational value indicating wheels I, having the usualdigits one to nine" thereon visible through sight openings 4, a suitably sup-. ported shaft 5 on which said wheels 3 are rotatably mounted, a series of toothed denominational number wheels 6 subjacent to the wheels 3, trainsof driving gears between the value indicating and number wheels of like denominations, including gears l and 8 fast on related wheels 3 and 6, re-' spectively, and an idler gear 8 intermediate each gear I and I. As will be understood, the register is designed to be operated by means of a travelling master wheel, not shown, engaging the number wheels 6 and rotating the same, and the value indicating wheels 3, step by step in a counterclockwise direction, for instance, as fully disclosed in U. S.'Patent, No. 1,576,960, issued to H. A. Foothorap under date of March 16, 1926. In the-rear of the number wheels 5 is a series a of transfer heads, one of which is shown at it,

mounted to rock in either of two directions upon a suitably supported shaft II, and equipped with 40 combined spring-pressed transferring and looking fingers l2 upon opposite sides of the axes of said heads. Sufilce it to explain that the transfer heads "I are adapted to be tripped from normal position by the number wheels 6 for continued movement in the direction in which they were tripped, to complete transferring operations. The details of construction and operation of this portion of the register, being unimportant to the present invention, it has been deemed unneces- 5o sary to furtheriliustrate and describe the same. Cooperating with each number wheel 6, as shown in Fig. 1', is the usual detent and centering roller ll mounted upon'an arm I! pivoted at it and tensloned by a spring I1.

I Coming now .to the various features of my inwhat may be termed a zero-setting shaft 18 jourinterdental spaces-or grooves 2|. The number naled at its opposite ends in the side plates I and 2, respectively, and endwise movable in said plates for a purpose presently seen. Cooperating oneway clutch devices are provided on the zero-registering shaft 16 and number wheels, respectively,

adaptedto be disengaged in the normal position of said shaft l6 to provide for 'free rotation of said wheels 6 in either direction, and designed for co-enga'gement upon slight endwise movement of said shaft 18 and rotation thereof, preferably in a clockwise direction. I

Preferably the clutch devices take the following form. A series of aligned shoulders or teeth 20, (Figs. 2 and 12-14), one for each number wheel 6, are cut or otherwise formed in-the shaft is longitudinally thereof, and are separated by wheels 6, each have pivoted on one side face thereof, in a chamber 22 (Figs. 2 and 3) provided therein, a clutch dog 23, one end of-which is urged by a, suitably arranged spring 24 into engagement-with the shaft 18. In the normal position of the shaft 13, the interdental spaces, or grooves 2|, are positioned inthe vertical plane of the dogs 23, so that; the number wheels 6 are rotatablefreely in either direction. Obviously, upon slight endwise movement of,the shaft 18, the grooves will be shifted from beneaththe dogs and the shoulders 20 will be located in the plane of said dogs 23 to engage the latter and thus pick up thewheels 6 upon rotation of the shaft l6 inthe proper direction. Since, as will be clear, endwise movement of the shaft l8 to locate the shoulders 20 in the plane of the dogs 23, must be accomplished prior to engagement of said shoulders and dogs, to prevent. possible obstruc tion to the axial travel of the shaft by premature contact of the dogs and the walls of the grooves and teeth, the parts are arranged, see Figs. 13 and 14, so that the shoulders 20, in the zero-registering positon of the wheels 3, are sufliciently in advance of the dogs 23 to -provide for an idle degree of rotation of said shaft, relatively to the wheels 6, proportionate to the required endwise movement, as will .be more fully explained.

The zero-setting shaft 18 is simultaneously rotated and moved endwise by the following means:

A manual zero-setting lever 25, (Figs. 1, 6 and 7) ,anda toothed zero-setting segment 26, are mounted to rock on a common horizontal pivot 21 on the side plate 2, and are operatively connected by a pin and slot 36, 3|, to effect downward and upward rocking movement of the segment 26 by what may be termed advance and retraction of said zero-setting lever 25, respectively. A collar 26 on the shaft l0 limits downward travel of the segment 26, by contact with the concave under edge of the segment 26, a tail 29 of the segment operating, by contact with the collar 26, to arrest the segment 26 and its lever 25 in their home positions. The pin and slot connection 30, 31 provide for -lost motion of said lever 25 relatively to the segment 26 in both directions of its movement, and said lever 25 is shown with a cam portion 32. It may be explained that the pin 30, slot 3|, and cam 32,

' form part of a transfer-restoring mechanism featured in my aforesaid co-pending application, and

which need merely be identified herein.

Suitably keyed to one end of the zero-setting shaft l3, between the wheel 6 of lowest denominawith the zero-setting segment 26.

tion and the adjacent side plate 2, is a combined plnlon-and-cam member 33, constantly in mesh For moving the shaft l8 endwise to position the shoulders, or teeth, 20 for engagement with g the clutch dogs 23, a single tooth of the combined pinion-and cam-member 33 (see Fig. 9) is beveled on one side face and in two directions, to wit, both vertically and horizontally, to provide a cam 34,

engageable by a shrouding plate 35 suitably secured to and extending along the outer side face of the zero-setting segment 26, the leading end of the shrouding plate stopping short of the leading end of the arcuate segment 26, and be;

I ing beveledtransversely to provide a cam 36 for cooperationwith the cam 34. The shrouding plate preferablyextends throughout nearly the entire length of the toothed segment 26, the outer arcuate edge of the plate projecting beyond, the ends of the teeth of the segment to form a restraining wall which, during the zero-resetting or clearing operation, maintains the resetting shaft 18 in effective position. j

The cam 36 is formed by'beveling theinner.

"face of the leading end of the shrouding plate 35.

In the normalposition of the parts (Fig.1), the cam 36 overlaps the cam. tooth'.34 in such close relation thereto that said cams are immediately engaged upon slight downward movement of the -taro-setting segment 26. As will be clear, a recip- 3o roc'al camming action is accomplished between the cams 34 and 36, first,'by downward movement of the shrouding plate 35,'and second, by

rotation of the cam 34 against the cain 36 as the pinion 33 is rotated by the resetting segment 26. as

The degree of inclination of the cams 34 and 36 is such that the required degree of endwise movement of the zero-setting shaft I8 is effected in lessthan a one-tooth step of rotation of the com -Y bined cam-and-pinion member 33.

Forreturning the zero-setting shaftendwise, the side faces of the teeth of .the combined pinion-and-cam member 33, on that side of the pinion opposite to thecam face 34, are all beveled to provide a series of faces forming a cam 31 (Figs.

2, 4 and 10) on.said pinion, and a blade '38..is

suitably secured at one end to the'inner face of the leading end of the zero-setting segment 26, opposite the shrouding plate 35, and transversely beveled to provide a cam face '39 for cooperation with certain of the series of faced or beveled teeth of the pinion forming the cam 31.- The blade 38 projects beyond the leading end of the segment 26. The relation of the cams 31 and 39 is such that, as the zero-setting segment 26 nears the end of its upward movement, said cams cooperate to shift the zero-setting shaft I6 endwise to its normal position. As shown in, Fig. 10, the cams 31 and 39' are beveled at different angles to provide for a reciprocal camming action, first, by engagement of the cam 39 with the extreme outeredge of the cam 31, and second, by engagement of the faces of said cams. A keeper plate 40, (Figs. 1 and 11) offset from the side frame 2,

and having a beveled edge 41, is suitably mounted on the inner face of the side frame plate 2,

and the blade 38 has a beveled end portion 42 engaging the beveled edge 4|, as shown in Fig. 11,- to prevent the blade 38 from being sprung laterally.

The extension of the blade 38 beyond the lead ing end of the zero-resetting segment 26 enables the cam face 39 of the blade to remain in contact with a cam face 31 on the inner face of the pinion 33 after the segment 26 has reached its'home opaaooev I 3- position, whereby to lock the pinion and the resetting shaft l6 in their. normal home positions, and thus prevent accidental axial ,travelof the resetting shaft and its pinion. towards resetting 5 position, during registering operations. The free end of the cam blade 36 when in its normal effective position, is engaged and backed by the offset edge ll of the keeper 46 to prevent the cam blade from springing or yielding laterally.

' m In the operation of the invention, the operator.

grasps the resetting lever.26 (Figs. 1, 6 and "1) and swings it upwardly in counter-clockwise direction, as shown in the figures. After taking up the lost motion provided by the pin-and-slot i5 connection. 36, 3|, the lever. through the pin 36, rocks thetoothed segment 26 downwardly in counter-clockwise direction.

The segment 26, being in constant mesh with the pinion 33 immediately starts to tum-the latter, and simultaneously. therewith, causes the withdrawal of the shaft-restoring cam blade 36 from contact with the beveled inner face 31 of the pinion 33, and the contact of the cam 36 'on the 'shroudingplate 36 with the cam face 34 of that tooth of the' pinion 33 which is overlapped by the 'cam 36 when the. parts are in their normal home positions. n

The angle at-whlch the restoring cam blade 36 is set relatively to the segment 26 and its path of .the pinion and its resetting shaft i6 under the influence of the shifting cam 36, and the action of the two cams 36, 36, is so timed that as the latter releases the pinion, the former begins to crowd the pinionand its shaft into resetting position. The shaft restoring cam 36 releases itself from its keeper 46 simultaneously with its withdrawal from contact with the inner cam faces 31 of the pinion 33.

Both axialand rotational travel is imparted simultaneously to the resetting shaft 16 in shift- -ing it from its normal position to its resetting position and vice versa. Should any ofthe numeral wheels 6 lie in their zero positions at the time the shaft is being adjusted to its resetting position, the spiral movement of the shaft would effect-a premature engagement of the walls of the shoulders with the dogs or pawls 23 which would tend to impede the shaft with a resultant liability of breakage.

To eliminate this danger, the shaft l6 and its operating mechanism areso related, that when the operating mechanism has restored the resetting shaftto its normal home position, the series of shoulders 26 lie at such a distance in front of the abrupt faces of their resetting dogs 23, that when the resetting shaft I6 is shifted to its resetting position, the spiral advance of the shoulders 26 towards the abrupt faces of the dogs 23 will be suillcient to bring the shoulders nearly or quite in contact with their respective dogs without 'premature engagement.

This feature is illustrated in Figs. 12, 13, and 14.

Fig. 12 illustrates the separation between the shoulders 26 and the dog 23 of a wheel standing at on Fig. 13 illustrates the relative positions of the shoulders and dogs, when the resetting shaft l6 has been shifted axially and rotatively to its resetting position, the shoulder ,26 directly in line with the dog 23, being that shoulder shown at the 7 i extreme left of Fig. 12. In this view, the shaft has already retumed the dog and its wheel one p.-

And Fig. 14 illustrates the relative positions of the shoulder 26 and a dog 23, when the wheel to which the dog is attached has been advanced one 5 step to indicate i" in an adding operation. In this view, the dog has advanced-beyond the eflective edge of theshoulder 26, so that should the shaft ll be shifted from its normal to' its resetting .position, with any wheel 6 in the l" posi- 10'.-

tion. the dog 23- of such wheel will not impede the shaft in its spiral travel from one to the other of its positions, and the shoulder 26 appropriate to such dog will not contact the dog to reset the accompanying wheel to zero until the shaft has 16- nearly completed its clockwise cycle.

Incidentally it will be observed that the shaft II, on the return stroke of its lever 26, retraces its resetting cycle, in counter-clockwise direction,

and asit nearly completes such return cycle, the 20 shoulders'26 pass beneath and escapefrom the toothed ends of the dogs 23 to assume the pomtion shown in Fig. 13, after which the final increment of movement necessary to return the lever 26 to its normal home position (Fig.1) imparts 26 a spiral movement to the resetting shafti'n countor-clockwise direction to axially shift the shaft to itshome position, and to rotate the shaft somewhat farther to withdraw the shoulders 26 from proirimity to the abrupt faces of the dogs 23, as 36 shown in Fig. 12,.

The resetting shaft, therefore, is given a rotation of more than 360 degrees, in both directions. though its resetting action on the dogs 23 and I their wheels 6 occurs during the last 366 degrees of the clockwise cycle.

The breadthof the resetting pinion is such as to maintain engagement with the resetting segment 26 in any axial position assumed by the pinion. 46

The shoulders 26 on the resetting shaft 16 turn with the shaft in a spiral path, as the segment 26 rotates the shaft, until. as the shaft reaches the end of its axial .travel imparted by the cam 36 on the shrouding plate, the shoulders lie 'in the to retain the pinion and its resetting shaft 16 in resetting position.

The resetting shaft l6 having been shifted to resetting position, the resetting segment 26 continues to rotate the shaft, the shoulders 26 of which pick up the dogs 23 during the down- 60 whereupon the operator returns the resetting lever 26 in clockwise direction, to its home position, which rocks the resetting segment 26 upwardly to its normal position, in which the parts are arrested by contact of the tall 23 on the segment with an opposite point on the collar 26.

The spring-pressed detents l6 retain the wheels 6 in their reset positions against accidental .displacement during the return of the parts to normal, and the segment 26, as it returns, reversely rotates the pinion 33 and resetting shaft Hi, the shroud plate 35 maintaining theshaft and pinion in their resetting positions until the resetting segment has nearly reached its home position. During such return movement of the shaft, the shoulders 20 thereon retract from the abrupt faces of the dogs 23.

Since the segment 26 and pinion 33 are con- 'stantly in mesh, the cam tooth 34 is always returned to the same point, and as the cam tooth returns to its normal position of rest, the cam face 36 on the shroud plate 35 is positioned opposite theretd' I The resetting shaft and its pinion, in the absence of springs or equivalent'mechanisms', re-

-mains in the resetting position to which it has been adjusted, even though a space tends to develop between the cam faces 36, 34, until, just prior to the arrival of the segment 26 in its home position, the shaft-restoring cam 36 is brought into contact with the beveledcam faces 31 of the pinion 33, and simultaneously the outer beveled wipes the restoring cam 38 firmly against the cam faces 31 of the pinion to shift the latter and the resetting shaft I3 back to their normal positions, and in so doing, brings the cam face 34 of the pinion in close juxtaposition tothe cam 36 on the shroud plate 35, preparatory to the next resetting operation. The resetting segment 26, during such final movement, completes the rotation of the shaft I8 back to its normal position, the parts being so timed that the shoulders 20 having escaped past the toothed ends of the dogs 23, take positions a short distance in advance thereof, as shown in Fig. 12.

During endwise movement of thezero-setting 'shaft iii, the wheels 6 are held against lateral movement therewith by spacing washers 43, (Figs. 3 and 4) intermediate the adjacent wheels 6, the gear 8 on the wheel 6 of highest denomination, and the keeper plate 40, the last two elements acting as spacing members between the wheels 6 of highest and lowest denomination and the side walls I and 20f the register, respectively.

The foregoing is a detailed description of the structure and operation of my invention, but the right is herein reserved to such modifications in the described structure as fall fairly within the scope of the claims appended hereto.

What I claim is:

1. In a register, the combination with denominational wheels, of zero-setting mechanism, in-

cluding an endwise movable rotatable shaft for said wheels, normally disengaged clutch devices on said wheels and shaft, respectively, adapted for co-engagement by endwise movement and rotation of said shaft, shaft-rotating means, including a rocking segment .and a pinion constantly meshing, and the latter fast on said shaft, and

cooperating devices onsaid segment and pinion, respectively, for effecting endwise movement of the shaft simultaneously with rotation thereof.

2. In a register, the combination with denominational wheels, of zero-settingmechanism, in- 5 eluding an endwise movable rotatable shaft for said wheels, normally disengaged clutch devices on said wheels and shaft, respectively, adapted force-engagement by endwise movement and rotation of said shaft, and means for simultanei0 1 ously imparting such movements to said shaft, including a toothed pinion on the shaft, a toothed segment constantly meshing with said pinion, and cooperating cam devices on said pinion and segment, respectively. l6

3. In a register, the combination with denominational wheels, of zero-setting mechanism, including an endwise movable rotatable shaft for said wheels, cooperating clutch devices on said wheels and shaft, respectively, adapted for 00- 2 engagement by endwise movement and rotation of the shaft, and for disengagement by return of the shaft to starting position, and means for simultaneously imparting endwise and rotary movement to said shaft and-subsequently return- 35 ing the shaft to starting position, including a toothed pinion fast on the shaft, a toothed segment constantly in mesh with said pinion, and

-.cooperating camming devices on the pinion and segment, respectively.

4. In a register, the combination with denominational wheels, of zero-setting mechanism, in- ('iuding an endwise movable rotatable shaft for said wheels, normally disengaged clutch devices on said wheels and shaft, respectively, adapted for co-engagement by endwise movement and rotation of said shaft, and means for simultaneously imparting endwise and rotary movement to said shaft, including a toothed pinion fast on the shaft, a toothed segment constantly meshing with 40 the pinion, and cooperating cam faces on a tooth of the pinion and the segment, respectively, one of said faces being beveled in two directions to provide for a double camming action in cooperation with the other face. 45

5. In a register, the combination with denominational wheels, of zero-setting mechanism, including an endwise movable rotatable shaft for said wheels, normally disengaged clutch devices on said wheels and shaft, respectively, adapted 5 for co-engagement by endwise movement and rotation of the shaft, and means for simultaneously imparting endwise and rotary movement to said shaft, including a toothed pinion fast on the shaft, a toothed rocking segment constantly meshing with said pinion, a cam side face on one tooth of the pinion and beveled in two directions, and a cam member on the segment normally overlapping said cam face .for quick cooperation therewith upon movement of the segment.

6. In a register, the combination with denominational wheels, of zero-setting mechanism, 1neluding an endwise movable rotatable shaft for said wheels, cooperating clutch devices on said wheels and shaft, respectively, the devices on 65 the shaft being movable into and out of the vertical planes of the devices on the wheels by endwise movement of the shaft in opposite directions, respectively, shaft-rotating means, including a toothed pinion and a toothed rocking 70 segment, and means for camming the shaft endwise in opposite directions, including beveled tooth faces on opposite sides of the pinion, and beveled cam members fixed to opposite sides of the segment. 75

7. In a register, the combination with denominational wheels, of zero-setting mechanism, including a shaft for said wheels adapted for both rotation and endwise reciprocation, cooperating clutch elements on said wheels and shaft, respectively, adapted for effective and ineffective relation by reciprocation of said shaft, and means for simultaneously rotating and reciprocating said shaft, including a zero-setting lever, and mutually movable shaft-rotating and shaft reciprocating connections between said lever and shaft cooperating to rotate and to axially shift said shaft alternately in opposite directions.

8. The combination with denominational wheels; of zero-resetting mechanism, including a shaft adapted for clockwise and counter-clockwise rotation, and for axial shifting; cooperating clutch devices on the wheels and shaft, respectively, adapted for effective and ineffective relation; a resetting pinion on the shaft; a toothed member engaged with the pinion and shiftable in opposite directions through a fixed path of travel, to reversely rotate the shaft; and cam members mounted to travel with the toothed member, and successively engageable with and disengageable from the pinion to shift the latter and the shaft axially in opposite directions.

9. The combination with denominational wheels; of zero-resetting mechanism therefor, including a reversely rotatable, axially shiftable shaft; cooperating clutch devices on the wheels and shaft, respectively, adapted for effective and ineffective relation; an oppositely beveled resetting pinion on the shaft; a reciprocable, toothed member engaged with the pinion to rotate the latter and its shaft in forward and reverse direction; and spaced cam members actuated with the toothed member, and individually and alternately operable upon the oppositely beveled faces of the resetting pinion, in succession, to axially :hift the pinion and its shaft in opposite direcions.

10. In a zero-resetting mechanism, the com bination with a plurality of denominational wheels; a resetting shaft adapted for rotation in opposite directions; and cooperating clutch devices on the wheels and shaft, respectively, adapted for effective and ineffective relation; of a resetting pinion on the shaft; a toothed resettingmember to engage the pinion, and shiftable in opposite directions to rotate the shaft through more than a complete cycle alternately in forward and reverse directions; and means to impart axial movement to the shaft in opposite directions simultaneously with the beginning of rotation of the shaft in one direction and the end of rotation of the shaft in the opposite direction.

11. In a zero-resetting mechanism, the combination with a plurality of denominational wheels; a reversely rotatable and axially shiftable resetting shaft; and cooperating clutch devices on the wheels and shaft, respectively, adapted for effective and ineffective relation; of a resetting pinion on the shaft; a resetting segment to engage the pinion, and shiftable in opposite directions from and back to its normal position to reversely rotate the shaft; separate cam members mounted on the segment in progressive-and in laterally spaced relation, to travel therewith, and shift the shaft axially in opposite directions alternately, one of the cam members becoming effective as the other becomes in- 5 effective simultaneously.

12. In a zero-resetting mechanism, the combination with a plurality of denominational wheels; a reversely rotatable and axially shiftable resetting shaft; and cooperating clutch devices on the wheels and shaft, respectively, adapted for effective and ineffective relation; of a resetting pinion on the shaft; a single unitary member shiftable from and to its normal position; one of the component elements of the unitary member adapted to engage the pinion and rotate the shaft alternately in opposite directions; other component elements mounted on opposite sides of the shaft-rotating element, and effective successively to shift the shaft axially in opposite directions, and to lock the shaft in either of its axially adjusted positions, simultaneously with the commencement of rotation of the shaft, and as it completes its return rotation, respectively.

13. In a zero-resetting mechanism, the combination with a plurality of denominational wheels; a reversely rotatable and axially shiftable resetting shaft; and cooperating clutch devices on the wheels and shaft, respectively, adapted for effective and ineffective relation; of a resetting pinion on the shaft; a resetting segment to engage the pinion, and shiftable in opposite directions from and back to its normal position to reversely rotate the shaft; a cam face associated with the resetting pinion; a restoring earn operable by the resetting segment and adapted to engage and release the cam face associated with the resetting pinion; and a stationary keeper engageable by the restoring cam as it engages its co-related cam, to hold the restoring cam to its work.

14. In a zero-resetting mechanism, the combination with a plurality of denominational wheels; a reversely rotatable and axially shiftable resetting shaft therefor; and co-operating sets of clutch devices on the wheels and shaft, respectively, relatively shiftable into and out of effective position; of means, including driving and driven elements to rotate the shaft; and cam faces mounted on the respective elements, the cam faces adapted to be driven in opposite directions past each other, whereby a mutually reciprocal camming operation is obtained to'shift the resetting shaft.

15. In a zero-resetting mechanism, the combination with a plurality of denominational wheels; a reversely rotatable and axially shiftable resetting shaft therefor; and co-operating sets of clutch devices on the wheels and shaft, respectively, relatively shiftable into and out of effective position; of means, including driving and driven elements to rotate the shaft; and cam members mounted on the driving element to shift the shaft axially, and to control the axial position of the shaft at all times. as

CARL F. AKEN.

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