US1261335A - Combined type-writing and computing machine. - Google Patents

Description

W. WRIGHT. COMBINED TYPE WRITING AND COMPUTING MACHINE.

APPLICATION FILED, FEB. 26,19I2.

Patented Apr. 2, 1918.

4 SHEETS-SHEET I.

ATTO/?? WITNESSES:

i w. wmGHT. COMBINED TYPE WRITING AND COMPUTING MACHINE APPLICATION FILED FEB. 26. |912.

Patented Api.2,1918g www EEEEEEEEEF WITNESS ES:

INVENTQR:

ATTO

W. WRIGHT. COMBINED TYPE WRITING AND COMPUTING MACHINE. APPLICATION FILED FEB. 26, 1912.

1,261,335. Patented Ap1-.2,1918.

Q 4 SHEETS-SHEET 3- WIT'NESSES: INVENTOR:

www y QWQWW ATTORN EIG.I4. Q

W. WRIGHT. COMBINED TYPE WRITING AND COMPUTING MACHINE. APPLICATION FILED FEB. 26, 1912.

l ,26 1,335. Patented Apr. 2, 1918.

4 sIIEETs-sHEE'T 4.

FIGJZ 428 f' 4a f' INVENToR: INEsss; WWW/@ f 1 W ATTORNE;

ycitizen ot the United States, residing waarna onerosi ASSGNR TO UNDERNOOD COMPUTENG ,335 Speciicatior. or" Letters Patent.

Patented Apr. 2, 1918.

Application iik-:d February 19M?. serial 1i' o. 679,851.

To all whom t may concern.'

lie it known that l, W'Arirnn lifarorrnn in New York city, in the county of New ork and State of' N ew York, have invented certain new and useful llmprovementsin Combined Type-Writing and Computing Machines, of which the following is a specification. v f

-This invention relates to the connections between the keys and the computing wheels or memhers, and is of especial value in combined typewriting and computingl machines;

ln a. cri-pend'ng case No. 677,046, tiled February 12, 1912, there is disclosed a combined typewriting and computing machine of the key-driven type in which a master wheel operates serz'catz'm upon the computingl wheels and rotates each, an amount varying according' to the key struck. The master wheel is normally held locked by a universal lock, which, on the depression of any numeral key, is released; and at the same time an individual lock operated by that key is thrown in to lock or cont-ol said master wheel. As the'key descends, a driver operated by the key rotates a gear wheel on which are teeth proportionate in number to the digit which'the type operated by the key will print, and these teeth rotate said master wheel. At the moment said master wheel is rotated by the last et said gear teeth, it is again locked by `an individual lock. r1`he key may then descend idly so rar as the computing' mechanism is concerned in the said application. @n the return stroke or" the key, the universal lock holds said master wheel locked; and at the very end of the return stroke, an arm on the driver moving' with the key turns said gear wheel, so that said driver will positively mesh with said lgear wheel en the next down stroke of the key. rlhe masternwheel is always locked or in mesh with the gear wheel operated by the type key, unless the ,gear wheel is in its vidle position', and in "that idle position a universal lock. holdssaid master wheel shaft locked. Therefore, the mast-er wheel and any wheel in mesh with it are always either positively driven or apositively locked.

rThe key operated driving segment in the present disclosure is formed with a flat surtace which will ope `ate like a Geneva movement in connection with the gear wheel meshing with the segment. This gear wheel is thus arranged to be positively locked in its normal position, and is also locked at the end of the down stroke of the segment.

Said gear is moreover locked during` the return or 11p-stroke of the key by another surface on said segment. The surface which forms the lock to hold said gear in its normal idle position, is designed, at the end of 'the rip-stroke of said segment, to strike a tooth on said gear, and thereby O'ive the gear a slight turn. This turn is suiiiacient to make the first tooth on said gear intercept the lirst tooth of the segment on its next depression, and thus meshing of the teeth onsegment and gear wheel is made positive.y

rihis turn is preferably given without the use of any spring, and since there is practically no weight added to the wheels r segment, the touch or the keys is exceed- A ine'ly light.

@ther 'features and advantages will hereinafter appear.

lin accompanying drawings.

Figure 1 is a diagrammatic side view o' an Underwood typewriting machina showing' my invention as applied thereto.

Fig. 2 is a similar front view of the same.

Figs. 3, 4t and 5 illustrate a driver and associated parts in successive positions when the driver is being depressed by the operation of a numeral key.

Fig. 6 is a front view of the connections between a driver and the master wheel shaft.

Fig'. 7 is a perspective view of a locking and driving wheel operated by a driver.

Fig. S is a perspective View of part ot a driver.

Figs. 9 to 17 are views of the driving gears operated by the segment, showing them 1for the diiierent numeral keys from ((177 to 66957.

ln the drawings, numeral keys 1 and character keys 2 depress levers 3 to operate helleranks 4' to swing type bars 5 upwardly and rearwardly, causing type 6 to strike against the platen 7 on the carriage 8. The carriage is drawn forward by a spring- 9, and is controlled in its movement by a rack 10, meshing with a pinion 11 on the hub of an esoapement wheel 12. This escapement wheel is controlled by dogs 13 operated by a universal bar 14 which is struck by heels 15 on the type bars 5, as the type approach the platen.

A totalizer 16 is supported by arms 17 riding in slots 18 on the front of the machine, and travels along with the carriage from which it is driven by an arm 19 resting in a yoke 20 on, said totalizer. In said totalizernumber wheels 21 are driven by a master wheel 22 on a shaft 23 extending transversely of the typewriter. This shaft turns the dials through intermediate gears 24 and is turned by the numeral keys in a manner presently to be described, through a gear 22a.

On each numeral key 1, there is fast an adjustable link 28 depending from a sevment or driver 29 which is loose on. shaft 29a extending across the upper part of the frame of the machine. On the arcuate surface of this segment are cut teeth 30 over part of its length. These teeth are arranged to mesh with teeth 31 on a mutilated gear wheel 32, and drive it; said gear wheel is loose on shaft 32a. At the upper end of the toothed section of said segment is a raised arcuate surface 34 equal in height to the teeth. Most of the teeth in this segment extend only part way -across the surface, as seen in Fig. 8; and the part 37 of the segment across which they do not extend is of the same height as said arcuate surface 34 at the end of the segment. The hollows or grooves between the two teeth at opposite ends, however, extend entirely across the segment.

The gear wheel 32, whose teeth mesh with this segment, has in the present case, eight of its teeth extending only part way across the section of the wheel which meshes with the segment, and the two remaining teeth 33 and 38 which form the boundaries of the arc from which the teeth are removed, extend entirely across.

The construction of the segment is best seen in Fig. S and of the gear wheel in Fig. 7. From the above description it will be seen that, when a segment is depressed by the operation of its numeral key, its teeth 3Q rotate the gear wheel until the broad tooth 33 sinks into and rises out of the broad groove 35 in the segment. Any further depression of the numeral key locks the gear wheel, because the broad tooth 33 rides up on'the raised fiat surface 34 of the segrevint and slides on said surface.

lVhen the numeral key is released so that it returns upward, the broad tooth 33 slides over surface 34, until it reaches groove 35, where, owing to the fact that it lies entirely outside the point circle of the teeth 30, it will not be engaged or rotated by these teeth, but will ride over on to the broad flat surface 37 of the segment beside the teeth 30, until the broad tooth 38 of the gear wheel reaches the depression or groove 39 of the segment.

Beyond this depression 39 is a fiat portion 40 on the segment somewhat similar to the portion 34 of the upper end, but lower in height; thus permitting the mutilated gear wheel to be rotated to bring its tooth 38 down, so that on its return stroke it will mesh with the first of the teeth 30 on the segment.

To insure this meshing, the lower end of the driver' has its broad surface raised at 4l, with an inclined cam surface extending thereto, so that when the numeral key rises, said cam surface will force the broad tooth 33 on the gear wheel 32 to the position shown in Fig. 3. This turns said gear wheel so that the broad tooth 38 on said gear wheel will extend across the point circle of the teeth 30 and hence will be positively engaged by the first tooth 30 on the segment beyond the depression 39, on the next operation of said key. It will thus be seen that for each complete reciprocation of a driver 29, the associated mutilated gear 32 will be given one complete revolution.

Fast o-n the gear wheel 32 is a second mutilated gear having teeth 43 proportionate to the numeral key operating it. In Figs. 3 to 8 and in Fig. 17, this gear wheel illustrated is the one employed for the numeral key 9 and consequently has nine teeth. These teeth 43 are arranged to strike the teeth 44 of which there are ten, on the main shaft 27, which drives the master wheel through gear wheel 22a. Thus a complete revolution of the gear wheel 32, shown in these figures aforesaid, will turn said main shaft nine-tenths of one revolution.

Between the teeth 31 and the teeth 43, as best shown in Fig. 7, is a cam 45 which is arranged to coperate with the curved surfaces on a wheel 47 fast on main shaft 27. This cam is interrupted at 46.

It will be observed in Fig. 3 which represents the parts just at the beginning of the stroke of the numeral key, that said interrupted or broken away portion 46 of cam 45 is opposite one of the curved surfaces on wheel 47 fast on the main shaft, and thus so far as this cam is concerned, the main shaft is permitted to revolve freely in that position. The instant, however, the parts move from the Fig. 3 to the Fig. 4 position as occurs when a numeral key begins to move downward, the raised portion 4S of the cam 45 swings in front of the curved surface 47 (see Figs. 6 and 2) and locks the main shaft against driving. lVhen, however, a tooth 43 moves up to contact with tooth 44 on the main shaft, the cam 45 is seen to be again cut away, so as to permit the main shaft to turn as it is driven by said teeth 43, and after it is turned again by said teeth it is again locked by the portion 48 of said cam 45; thus locking main shaft again until the cut away portion 46 arrives opposite said shaft. Thus it will be seen that unless the numeral keys are in their idle positions, the main shaft is either positively turned or positively locked by the moving numeral key. l

A universal lock 49 is provided at one end of the main shaft drivemechanism to cooperate with a second curved-surfaced Wheel 50 on a wheel fast on said shaft 27; thus locking it. On this -universal lock 49 is formed a pin 51 which rides in a cam slot 52 on an arm 53 fast on a rock shaft 54. On this rock shaft are also fastened cam fingers 55, one for each segment, and these cam fingers are operated by cam surfaces 56 fast on gear wheel 32, and are also arranged with reference to gear teeth 43, (which, it will be remembered, are also fast on said gear wheel) so that the universal lock 49 is swung out free from the surfaces 50 during the time that the teeth 43 are in mesh with the teeth 44 on the main shaft and are driving it. Said finger is drawn back by spring 42 Y against the cut away portion 57 of said cam surface after the last tooth 43 has meshed with and passed the teeth 44 on the main shaft; thus locking the parts. 4

Thus it will be seen that t-he universal lock holds the main shaft always locked when it is in idle position, that is to say, the universal lock always holds the main shaft locked unless the main shaft is otherwise looked or is being positively turned.

All the parts between the gear wheel 32 and the cam 56, as seen in Fig. 7, form a unit which turns as a sleeve loose on shaft 32, and there is one such unit for each numeral key. Except for the varying number of teeth 43' and the cam 45 which varies in Y the length of its part 48, these units may be 40q identical forl allthe numeral keys. Figs. 9 to 17 show the arrangement of the varying lengthsof the raised portion 48 and the I teeth 43 for each of the numeral keys from llto 9; the gear for key 17 having one tooth, yfor key 2 having two teeth. The units comprising the 'gear wheels 32 may be spaced from each other on shaft 32'L by collars 64. 'v

The operation may be summed up as follows:

The numeral ,keystruck depresses a segment 29, the surface 40 of which holds the gearteeth 31 locked until the depression 39 is reached, ivhen the teeth 3() mesh with the teeth 31 and rotate the gear wheel 32 carrying the teeth 31. This gear wheel 32 moves with it its cam 45 to lock the main shaft, and its cam 56 in the meantime, is moving the universal locking member 49 out of operative position. As the gear wheel 32 continues to turn, the teeth 43 moving with it, mesh with the 'teeth 44 on the main shaft. The eut-away portion 46 of the cam 45 here comes into play, permitting the drive shaft to be rotated, and, when the last of the teeth 43 has passed the main shaft, the raised por-` tion 48 of the cam 45 again locks the main shaft. Vhen the numeral key has depressed the segment through its normal stroke, the gear wheel 32 with the teeth 31 will have made one complete revolution and further depression of the key has no effect on the mechanism. The universal lock is swung back by its spring 42 to lock the main shaft, and the raised surface 34 of the segment will lock the gear wheel 32 against further rotation.

kIf now the numeral key is released, the key lever will rise, raising its segment again. In view of the fact that the tooth 33 is entirely outside the point circle of the teeth 30, it will fail to na h with the broad notch 35, and the gear wheel 32 will then be locked against meshing at allby the broad raised surface 37, until at the'very end of the segments up-stroke, the raised portion 41 strikes the tooth 33 and gives the gear wheel 32 a slight turn which makes it positively mesh with the first tooth the next time the segment is operated.

In order to prevent any incomplete ope-ration of the Computing mechanism, a full stroke mechanism is provided for the segment, consisting of teeth 59 cut on it approximately at an angle of forty-five de-A grees, over which a rock arm 60 is arranged to slide, as best shown in Fig. 4, where it will be seen that, if the segment is depressed, the teeth 59 will slide easily past the arm 60, which is pressed against them by means of a spring 61.

1f, however, the key should be released and the segment starts to return at an intermediatek point, some tooth 59 will lock against the arm 60. After the segment has completed its full downward stroke, the end of it will permit the arm 60 t0 have full play again, and the spring 61 will swing it hor1- zontal so that the teeth striking the rock arm will turn it in the reverse direction and slide over it easily.. The teeth at the bottom of the segment are cut away at 62 to permit the rock arm to be restored to its operative position by spring 61, as seen in Fig. 3.

The totalizer herein shown is of the outside drive master wheel type and may comprise any preferred form of earry-over mechanism for the dial wheels.

1t will be noted that the main shaft 27 is always driven in one direction, so that only one Side of the teeth 44 is shown of odontoid form. The non-driving side is preferably out away, as seen at 63, so that the first tooth 43 will always mesh with the propertooth 44.

The present invention provides a light and simple construction for the positive key drive. There are no extral parts added to move any part to an operative position, neither are strong Springs Vused for any such purpose. Practically no parts are reversed in movement except those that reciprocate bodily with the key lever. so that little force is needed in pressing the keys.

Variations may be resorted to within the scope of the invention, and portions of the im rovements ma be used without others.

aving thus escribed my invention, I claim:

l. In a computing machine, the combination of a partly toothed driver, means for reciprocating said driver, a driving gear driven by the teeth of'said driver, a surface on said driver locking said gear but allowing lost motion, and an extension of said surface positively locking said gear and holding said gear so that on the next reci rocation it will mesh with the teeth of said driver, said locking surface and its extension lying in the same plane with the driver teeth.

2. In a computing machine, the combination of a partly toothed driver, means for reciprocating said driver, a drivin gear driven by the teeth of said driver t-rough a complete revolution at each driviiig operation of said driver, a Surface on sai driver holding said gear locked on the reverse stroke of said driver but allowing lost motion, and an extension of fsaid surface positively locking said gear and positively controlling said gear so that on the next reciprocation it will mesh with the teeth of Said driver, said locking surface and its extension lying in the same plane with the driver teeth. l

3. lIn a computing machine, a driving segment having a curved, flat surface and a surface inclined relatively thereto, and a gear wheel driven by said segment and with which the inclined surface forms a Geneva lock.

4. In a computing machine, the combination with a. reciprocatable toothed driver, of a mutilated toothed gear to be engaged and driven thereby during an intermediate poi'- tion .of each forward stroke thereof, said gear having its teeth so spaced that, when standing in the position to which it is moved on a forward stroke of said driver, the teeth of said driver may be moved past said gear ona return stroke without engagement therewith, a surface on said driver to coperate with said gear after the driver teethhave passed said gear on a return stroke to permit said gear to be moved from its disengaging position with respect to said driver teeth, but no farther, and' means on Said driver to engage a tooth of said gear adjacent the point of mutilation, on the return stroke of said driver to positively move said gear to and retain itin engaging position in readiness for another forward stroke of isaid driver. i,

5. The combination of a series of computing wheels, a ear connected to drivesaid computing whee s, a reciprocating driver,

and means for 'operating said driver, said driver having means thereon to effect a partial rotation of said gear by enga ment with the teeth thereof during one str o e and having meansthereon for completing the rotation of said gear, by enga ementwith the teeth thereof on return stro e of said driver,- so as to completely rotate said gear yby engagement of the driver With the teeth of said gear during a single reciproc'ation of the driver.

6. The combination with a toothed driving gear, of a reciprocating member having a surface normally holding said gear locked by engagement with teeth on said gear, teeth on said reciprocating member adapted to engage teeth on said gear and rotate said ar, and a Geneva locking portion interme iate the surface normally engaged by the gear teeth and the teeth on said reciprocating member, permitting said gear to stand so that its teeth lie inside the point line of the teeth of said reciprocating member.

7. The combination with a segment and a. driving unit operated thereby, of teeth lying in one plane along said segment, cooperating teet i on said driving unit adapted to be driven by said segment teeth, and a Geneva locking surface normall said unit so that it will be turned y the segment teeth whenever the segment is o erated, said surface lying in the same p ane with said segment teeth.

8. The combination with a driving unit having teeth thereon, of a segment havin teeth normally disengaged from those o said unit, said unit also having a Geneva. locking surface adapted to allow lost motion of said unit, and an extension of said Geneva locking surface cooperating with the teeth on said unit for holding said unit so thatits teeth will mesh with the segment teeth as the segment travels from a. position in which said unit is locked by said locking surface to position to rotate said unit.

9. Ina computingmachine, the combination withareciprocatable toothed driver, of a toothed gear to be engaged and driven thereby during an intermediate portion of each forward stroke thereof, said gear having its teeth so spaced that, when standing in the position to which it is moved on a forward stroke of said driver, the teeth of said driver may be moved past said gear on a return stroke without engagement therewith, means on said driver to positively move-said gear to, and hold it in, such disengaging position during the completion of a driving stroke, and means on said driver to engage a tooth of said gear at the completion of a return strokepf said driver, and positively move said gear to and retain it in engaging position in readiness for another forward stroke-1 of said driver. 3;,

10. In a computing machine, the combinaholding iso tion with a reciprocatable toothed driver, of a toothed gear to be engaged and driven thereby on each forward stroke thereof, said gear having its teeth so spaced that, when standing in the position to which it is moved on a forward stroke of said driver, the teeth of said driver' may be moved past said gear on a return stroke without engagement therewith, means on said driver to hold said gear in such disengaging position during return stroke until the driver teeth have passed said gear, means on said driver to coope ate with said gear after the driver teeth have passed said gear on a return stroke to permit said gear t0 be moved from its disengaging position with respect to said driver teeth to its engaging position, but no farther, and means on said driver to engage a tooth of said gear at the completion of a return stroke of said driver and positively move said gear to and retain it in position t0 be engaged by the teeth of said driver on its next forward stroke.

11. In a computing machine, the combination with a reciprocatable toothed driver, of a toothed gear to be engaged and driven thereby during an intermediate portion of each forward stroke thereof, said gear having its teeth so spaced that, when standing in the position to which it is moved on a forward stroke of said driver, the teeth of said driver may be moved past said gear on a return stroke without engagement therewith, means on said driver to positively move said gear to, and hold it in, such disengaging position during the completion of a driving` stroke,

means on said driver to hold said gear in such disengaging position during return stroke until the driver teeth have passed said gear, means on said driver to cooperate with said gear after the driver teeth have passed said gear on a return stroke to permit said gear to be moved from its disengaging position with respect to said driver teeth to its engaging position, but no farther, and means on said driver, lying in the sameplane with said driver teeth, to engage said gear at the completion of a return stroke of said driver, and positively move said gear t0 and retain it in. engaging position in readiness for another forward stroke of said driver.

12. In a computing machine, the combination with a mutilated gear devoid of teeth at one portion of its eircun'iference, of an oscillating driver effect a part of a revolution of said gear by engagement with the teeth thereof during one stroke and having means thereon, lying in the same plane with said driver teeth, for completing one full revolution of said gear on the opposite stroke, so as to effect a complete revolution of said gear on each complete oscillation of said driver'.

13. In a computing machine, the combimove said 0ear to l b having means thereon r9' nation with a reciprocatable toothed driver, of a toothed gear to be engaged and driven thereby on each forward stroke thereof, said gear having its teeth so spaced that, when .tanding in the position to which it is moved on a forward stroke of said driver, the teeth of said driver may be moved past said gear on a return stroke without engagement therewith, means on said driver to hold said gear in such disengaging position during return stroke until the driver teeth have passed said gear, and means on said driver to engage a tooth of said gear at the completion of a return stroke of said driver, and positively move said gear to and retain it in position to be engaged by the teeth of said driver on its next forward stroke.

14. In a computing machine, the combination with a reciprocatable toothed driver, of a toothed gear to be engaged and driven thereby during an intermediate portion of each forward stroke thereof, said gear having its teeth so spaced that, when standing in the position to which it is moved on a forward stroke of said driver, the teeth of said driver may be moved past said gear on a return stroke without engagement therewith, means on said driver to positively move said gear to, and hold itl in, such disengaging position during the completion of a driving stroke, means on said driver to coperate with said gear after the driver teeth have passed said gear on a return stroke to permit said gear to be moved from its disengaging position with respect to said driver teeth to its engaging position, but no farther, and means on said driver, lying in the same plane with said driver teeth, to engage said gear at the completion of a return stroke of said driver, and positively move said gear to and retain it in engaging position in readiness for another forward stroke of said driver.

15. In a computing machine, the combination with a reciprocatable toothed driver, of a toothed gear to be. engaged and driven thereby during an intermediate portion of each forward stroke thereof, said gear having its teeth so spaced that, when standing in the position to which it is moved on a forward stroke. of said driver, the teeth of said driver may be moved past said gear on a return stroke without engagement therewith, means on said driver to positively and hold it in, such disengaging position during the completion of a driving stroke, and means on said driver, lying in the same plane with said driver teeth, to engage said gear at the completion of a return stroke of said driver, and positively move said gear to and retain it in engaging position in readiness for another forward stroke of said driver.

16. The combination of a toothed gear; a driver having means thereon engageable withthe teeth on said gear, tiall rotation of the latter; a key for actuating said driver; and a cam on said driver engageable with one of the teeth on said gear to effect a further rotation of said gear.

17. In a computing machine, the combination with a reciprocatable toothed driver, of a toothed gear to be engaged and driven thereby on each forward stroke thereof, said gear having its teeth so spaced that, whenl standing in the position to which it is moved on a forward stroke of said driver, the teeth of said driver may be moved past said gear on a return stroke without engagement therewith, means on said driver to hold said gear in such disengaging position during return stroke until the driver teeth have passed said gear, means on said driver to coperate with said gear after the driver teeth have passed said gear on a return stroke to permit said gear to be moved from its disengaging position with respect to said driver teeth to its engaging position, but no farther, and means on said driver, lying in the same plane with said driver teeth, to engageA said gear at the completion of a return stroke of said driyer, and positively move said gear to and retain it in position to be engaged by the teeth of said driver on its next forward stroke.

18. In a computing machine, the combination with a reciprocatable toothed driver, of a toothed gear to be engaged and driven thereby on each forward stroke thereof, said gear having its teeth so spaced that, when to effect a parstanding in the position to which it is movedv on a forward stroke of said driver, the teeth of said driver may be moved past said gear on a return stroke without engagement therewith, means on said driver to hold said' gear' in such disengaging position during return stroke until the driver teeth have passed said gear, and means on said driver, lying in the saine plane with said driver teeth, to engage said gear at the completion of a return stroke of said driver, and positively movesnid gear to and\retain it inl position to be engaged 'by' the teeth of said driver on its next forward stroke.

19. The combination, with a series of computing wheels; of a series of numeral keys for controlling the action of said computing wheels; a mutilated gear devoid of teeth at a point in its circumference and connected to drive one of said computing wheels; and a driver connected to be actuated by one of said numeral keys and having peripheially-locatedmeans to effect a complete rotation of said mutilated gear by direct and positive engagement with the teeth thereof.

20. In a computing machine, the combination with a reciprocatable toothed driver, of a toothed gear to be engaged and driven thereby on each forward stroke thereof, said gear having its teeth so spaced that, when standing in' the position to whichlit is moved on a forward stroke of said driver, the teeth of said driver may be moved past said gear on a return stroke without engagement therewith, and a raised part on vsaid untoothed portion of said driver to'engage a tooth of said gear at the completion of a return stroke of said driver, and-positively move said gear to and retain it in engaging position in readiness for another forward stroke of said driver.

21. In a computing machine, the combination with a reciprocatable toothed driver.1 of a toothed gear to be engaged and driven thereby on each forward stroke thereof, said gear having its teeth so spaced that, when standing in the position to which it is moved on a forward stroke of said driver, the teeth of said driver may be moved past said gear on a return stroke without engagement therewith, and. a raised part on said untoothed portion of said driver, and lying in the same plane with said driver teeth, to engage said gear at the completion of a return stroke of said driver, and positively move said gear to and retain it in engaging position in readiness for another forward stroke of said driver.

22. In a computing machine, the combination with a reoiprocatable toothed driver, of a toothed gear to be engaged and driven thereby during an intermediate portion of each forward stroke thereof, said gear having its teethso spaced that, when standing 1n the position to which it is moved on a. forward stroke of said driver, the teeth of said driver may be moved past said gear on a .return stroke without engagement therewith, means on said driver to positively move .said gear to, and hold it in, such disengaging position during the completion of a driving stroke, means on said driver to hold said gear in such disengaging position during return stroke until the driver teeth have passed said gear, and means on said driver to engage a tooth of said gear at the completion of a return stroke of said driver, and positively move said gear to and retain it in engaging osition in readiness for another forwar stroke of said driver.

23. In a computing machine, the combination with a reciprocatable toothed driver, of a toothed gear to be engaged and driven thereby during an intermediate portion o f each forward stroke thereof, said gear having its teeth so spaced that, when standing in the position to which it is moved on a forward stroke of said driver, the teeth of said driver may be moved past said gear on a return stroke without engagement therewith, means on said driver to positively move said gear to, and hold it in, such disengaging position during the completion of a driving stroke, Imeans on said driverto hold said gear in such disengaging position during return stroke until the driver teeth have passed said gear, and 5 means on said driver, lying in the same plane with said driver teeth, to engage said gear at the completion of a'return stroke of said driver, and positively move said gear to and retain it in engaging position in readlness for another forward stroke of said 10 drlver.

WALTER WRIGHT.

Witnesses z LoRENz L. PRITZL, B. GoL-DBERG.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, '.D. C.

Images