US1016308A - Adding and listing machine. - Google Patents

Description

O. H. WALKER.

ADDING AND LISTING MACHINE.

APPLICATION FILED MAY 29, 1909.

1,016,308. Patented Feb. 6, 1912.

3 SHEETS-SHBET 1.

G. H. WALKER.

ADDING AND LISTING MACHINE.

APPLICATION FILED MAY 29, 1909.

.2 mom T m H .S v m m m n3 6 b a P w 8 O 3 m B J a 6 w W 1 m 0 C. H. WALKER.

ADDING AND LISTING MACHINE.

APPLICATION FILED MAY 29, 1909.

Patented Feb. 6, 1912.

3 SHEETS-$113131 3 UNITED STATES PATENT OFFICE.

CHARLES H. WALKER, OF DETROIT, MICHIGAN, ASSIGNOR 'I'O BURBOUGHS ADDING MACHINE COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

ADDING AND LISTING MACHINE.

' Specification of Letters Patent.

Patented Feb. 6, 1912.

Application filed May 29, 1909. Serial No. 499,116.

To all whom it may concern:

Be it known that I, CHARLES H. WALKER, a citizen of the United States, residing at Detroit, in the county of lVayne and State of Michigan, have invented certam new and useful Improvements in Adding and Listing Machines, of which the following is a specification. I

The principal object of the present invention is to do away with the so-called spacing stroke which in the ordinary construction of adding and listing machines of the well-known Burroughs type is necessary prior to the taking of a total. The necessity for this extra or spacing stroke comes about partly from the circumstance that in transfer or carrying operations certain pawls are displaced which in a totaling operation constitute stops to limit backward turning of the adding wheels and such pawls are not restored to normal until an advanced stage in the operation of the machine has been reached when wheels can have already passed the zero point turning backward,- it being understood that the manipulation preliminary to atotaling operation releases all the wheel-actuating racks and that the levers carrying the latter also carry the printing type and that in order to correctly set up the total it is necessary that the movement of such levers be measured by backward rotation of the wheels to zero. Then in the type of machine referred to transfer or carrying movements of adding, wheels is effected by extra movements of the actuating racks so that at the conclusion of an adding operation in which such carrying movements have taken place one or more racks will be beyond the normal position. It follows therefore that even if the abovementioned pawls were restored in time to stop the wheels at zero or other means brought into playto perform this function, a totaling operation without first restoring such racks to normal would result in printing digits a step short of those that should be printed or of course ciphers might be printed where 1s should appear..

Hence it has been customary heretofore to have a total key look under control of the transfer mechanism in such manner as to prevent depression of the total key until through the so-called spacing stroke or for striking a correct total without first re- 1 storing pawls and racks to normal by the spacing stroke or blank operation. Other means come into play to stop the wheels at zero and provision is made to compensate for the transfer advance of racks. In the course of a grand totaling operation the pawls will be re-set but when the operation is a subtotaling one these pawls remain displaced. This latter provision is necessary because, the racks having descended from an abnormal position in turning the adding wheels backward to zero, must return to that same abnormal position in order to bring the wheels forward again to the same positions they occupy at the outset of the operation.

In the drawings which accompany and form part of the specification Figure 1 represents in left side elevation suflicient of an adding and listing machine of the Burroughs type to illustrate the application of the present improvements thereto, some supporting parts being shown in section and some parts being broken away to disclose others in rear of them; Fig. 2 represents a front elevation of part of the structure shown in Fig. 1; Figs. 3 and 4 are vertical sectional views quite similar to the right-hand portion of Fig. 1 but illustrating conditions differing from each other and from that shown in Fig. l, the latter illustrating all the parts at normal, whereas Fig. 3 illustrates the condition at the conclusion of an operation when a transfer has taken place, and Fig. 4 illustrates the condition at the middle of a grand totaling operation; Fig. 5 is a view similar to Figs. 8 and 4 though not illustrat ing so many parts but showing an intermediate stage between those shown in said figures, to-wit that when the total key is depressed but the operation of the machine has not started; Fig. 6 is a left side elevation similar to Fig. l but confined to the parts appearing at the upper right-hand portion of Fig. 1 and showing a condition diflerent from that illustrated in Fig. 1, t-o-Wit that obtaining when the sub-total key has been depressed; and Fig. 7 illustrates some of the parts appearing in Fig. 6 and under similar conditions except that the operating handle 7 is supposed to have been drawn forward.

For details of construction of a machine of the Burroughs type reference may be had to prior patents on inventions of William S. Burroughs, Nos. 504,063 and 505,078,

issued September 12, 1893, and Patent No.

eration of the various departments of the Burroughs machine.

The reference numeral 916 designates adding pinions carried as usual in a rock frame 910 and adapted to be moved out of and into engagement with racks 610, the latter carried by levers 611 loose on a central rock shaft 600 which carries a frame or bail 613 normally upholding said levers at theirforward ends. The latter at their rear ends carry type plates 618 to be driven against a roller platen 17 through the usual means. The accumulator frame 910 is rocked in the usual way through the me dium of a pitman 914 which is controlled by total and sub-total keys 265 and 265 arranged as illustrated in said Vincent patent.

The racks 610 are slotted lengthwise to engage studs a on the levers 611 but for the purposes of the present invention the slots 6 are elongated downwardly as compared with those ordinarily found in Burroughs machines. Furthermore, there are pivotally mounted upon the racks 610 at points above the levers 611 pawls or catches 13 whose arms extending below the pivots are drawn forwardly by springs a" so as to bear against the studs a as shown in Fig. 1, transverse abutment shoulders b of said catches normally standing a distance below the said studs but in the path of movement thereof. These transverse shoulders normally correspond with the lower ends of the slots in the usual construction. In other words they permit movement of the levers 611 independently of the racks 610 far enough to present at the printing line thecipher types or conversely to permit an upward movement of'the racks 610 independently of the levers 611 a distance sufficient to turn the pinions 916 one step for ward. Springs 680 connect the studs a with the racks 610 and perform the usual function of impelling the racks this extra distance or the simple function of connecting links for carrying the racks up with the levers, according to how far the trans-- fer or carrying devices of the machine have been affected in the adding operation. The

usual pawls 413 normally obstruct studs 651 on the racks, which studs may constitute the pivots of the catches B, these pawls adapted to be displaced by the transfer studs 952 on the pinions 916. Springs 180 connect said pawls 413 with pivoted latches 411 which, when the pawls are displaced, hold them displaced until in a succeeding operation of the machine the latches are restored by the bail rod 902.

Now it will be understood that in an adding operation the racks drop while out of mesh with the pinions and return in mesh therewith and that if in the forward rotation of the pinions any of the pawls 413 are displaced the racks of the next higher wheels will travel on upward to a position one step beyond the normal and if the extra movement of a pinion due to such extra movement of its rack causes that pinion to arrive at or pass the zero point it will in turn trip a transfer pawl and then the spring 680 of the next higher rack comes into play and so on for successive transfers. This leaves one or more racks a step beyond normal at the conclusion of the operation. If the total key should now be depressed and the machine operated the pinions 916 would rotate backward but pawls 413 displaced for transfer operations and remaining displaced would not stop the associated pinions at zero and even if some separate zero stop was provided the proper total would not be set up since the levers 611 could not have the necessary one-step movement in advance of the racks, the lever studs being at the lower instead of the upper ends of the rack-studs 3.i3 tl18 outset.

Hence it has been customary heretofore to employ a look under control of the latches 411 to prevent depression of the total key until the latches had been restored to normal and the restoration of these latches to normal necessitated a blank operation of the machine in order to vibrate the bail rod 902. (The look was in the form of a bail with a shoulder to engage under a stud on the total key lever and a cross rod to be obstructed by the latches, the bail being primarily swung to locking position by depression of amount keys; all as shown in said Vincent patent.)

Now, the elongation of the slots 5 above mentioned makes provision for movement of. the levers 611 one step farther than they ordinarily would move if, with racks 61 0 standing above normal, the total key should be depressed and the machine operated. Thusit is madepossible to compensate for the shortage in movement of the said levers measured by the upper portion of the slots corresponding with the usual slots in the racks. It will be understood that, a transfer having taken place, the extra upward movement of a rack will have brought the catch B of such rack up against the leverstud a, as illustrated in Fig. 3,a condition similar to that in the ordinary construction. But it will be obvious that if in a totaling operation the pawls or catches B are displaced the springs 685 which constantly pull down on the forward arms of the levers 611 will move those levers a step independently of the racks notwithstanding the latter may be beyond the normal position. To this end said catches are formed with upwardly-extending fingers I) normally below the arc of movement of a bail cross rod C (Fig. 1) supported by curved side arms 0 pivoted to the framework as shown at c in Figs. 2, 8,

and 4. The bail thus constructed is under.

the control of the total key lever 22?. The latter is as usual secured to a rock shaft 204 and the latter for the purposes of the pres ent invention carries affixed to it an arm D which has a stud engaging a bifurcated end of the left-hand side piece 0 of said bail.

Obviously, depression of the total key rocks the bail and swings its cross rod C forward over the tops of the catch extensions or fingers bk Now if any of the racks have moved up beyond the normal position such movement will have carried said fingers 6 into the path of said bail cross rod as illustrated in Fig. 3. Consequently, upon depression of the total key such of the catches as have been so elevated will be rocked, carrying their shoulders I) from under the studs a as illustrated in Fig. 5. Then upon operation of the machine the levers 611 asso ciated with any of the abnormally-positioned racks will partake of extra movement and the proper type will be brought to the printing line.

Inasmuch as the latches 411 are not restored until just as the operating handle reaches the forward end of its stroke and transfer pawls 413 would nottherefore be in position to stop the wheels 916 at zero, other means are provided for limiting the backward rotation of the pinions. Thus a comb plate E is pivoted to the accumulator frame 910 and connected by a link a with an arm e on a rock shaft 1400 which in turn is connected by a link -e with the bell crank lever 227. This arrangement causes forward rocking of said comb plate by de pression of the total key and such forward rocking carries the teeth of the combplate into the paths of movement of the transfer studs 952 as illustrated in Fig. 4.

The total key having been depressed and the handle drawn forward the racks drop,

the levers 611 first, however, advancing a step by reason of the displacement of catches B, just as these levers move in the regular construction after a spacing stroke has been taken. Of course the descent of the racks is limited by abutment of the transfer studs 952 against the comb plate E as illustrated in Fig. 4. The studs a have meantime descended in front of the forward edges of the lower portions of the catches B as here illustrated so that though said catches with the descent of the racks pass out of'contact with the bail cross rod 0 they are still held displaced. At the termination of the forward stroke of the operating handle the pawls 413 are restored as usual so that when the handle swings back and the levers '611 are elevated the studs 651 will encounter said pawls to stop the racks at normal. Then the levers moving on upward carry their studs a past the transverse shoulders b of the catches B, the latter thereupon returning to normal, and in continued movement of said levers, the studs (1 travel on to the upper ends of the slots Z), (Fig. 1).

It will now be seen that the invention provides for the taking of a grand total without the necessity of an extra operation of the machine or spacing stroke but immediately following a series of adding operations notwithstanding at the conclusion of the same racks may stand in abnormal position. Inasmuch as the racks in the taking of a sub-total as well as in the taking of a total descend from such abnormal positions in case of transfers having taken place, it is of course essential that any such racks shall again assume the abnormal position in order that the adding wheels may again dis-- play the same total. Consequently in the taking of a sub-total the latches 411 and pawls 413 are not re-set but the resetting mechanism is disabled. To this end the connections for vibrating the bail of which the cross rod 902 forms a part are modified.

Said bail as usual comprises side pieces 922 and 922 (Fig. 3) secured to a rock shaft 904 but the operating link or bar 918 slotand-pin engaged as usual with the rock arm 813, is not connected directly to said rock shaft 904. It is coupled to the lower arm of a lever 922 loose upon said rock shaft 904. The upper arm f of said lever has a laterally-projecting stud f which normally lies in the socket of a tappet-piece f pivoted on the left-hand side piece 922 of the aforesaid bail. A spring f applied to a forward projection of said tappet-piece normally holds the latter in engagement with said stud. Thus in any itemizing operation or any blank operation or any grand totaling operation of the machine the lever 922 -acting upon the tappet-piece f rocks the bail for ward as usual so that it will restore any displaced latches 411 and permit the corresponding pawls-413 to return to normal. However, when the sub-total key 265 is depressed the said tappet-piece will be displaced, through means presently to be specified, so that then the lever 922 rocks idly. A sub-total key bar 216 of the character shown in said Vincent patent has at its for- Ward end a stud g engaging the bifurcated upper end of a bell crank lever f suitably pivoted to the framework of the machine and Whose rearwardly-projecting arm f overlies a stud f on the forward end of the tappet-piece F. It results that depression of the sub-total key by drawing the bar 2H3 rearward causes displacement of the tappetpiece as illustrated in Fig. 6'With the result above forecast. Consequently, any displaced pawls, 413 remain displaced and such racks as have descended from abnormal positions will return to the same positions and not stop one step short as they would if such pawls had been restored. Hence thetot-al carried by the pinions 916 and exhibited upon the wheels 920 at the outset of the operation will be again exhibited at the conclusion thereof.

Of course the lever 922 must rock the latch-restoring bail in both directions exceptin a sub-totaling operation and hence the rock shaft 904 has a depending finger 7 extending in front of a stud f on the depending arm of said lever.

The subtotal key bar 216 is modified as compared with that shown in said Vincent patent, by having formed upon it an up-- standing spu-r j tapered to a point but presenting a straight rear edge for coaction with a stud j on the total key lever 227" to lock the sub-total key against depression when the total key is d rectly operated. \Vhemt-he latter is so operated, said stud 7" passes down along the straight rear edge of said spur. When the sub-total key is depressed the rearward movement of the bar 216 is such as to take the point of the spur to the rear of the stud before the latter lowers to the plane of movement of the spur. Then the stud simply passes down along the front edge of the spur as the latter moves back.

It will be understood that the bar 216 operates, upon depressionof the sub-total key, to depress the total key, as in the Vincent patent, by reason of a lug Z. on said bar acting upon a stud k of the lever 227.

Vhile the above-described construct-ions are well adapted to fully attain the objects primarily stated, it is to be understood that such constructions are susceptible of modi ficatio n within the scope of the invention.

hat I claim is:

1. In a machine of the character described, the combination with adding wheels, actuators therefor, type carriers connected to the actuators, transfer or carrying mechanism controlling movement of actuators relative to type carriers, and totaling means controlling actuators and type carriers for set-ting the latter by reverse rotation of the adding wheels when actuators are abnormal relative to type carriers; of means to compensate for movements of acscribed,

tuators back to normal in operation of the type carriers under control ,of the totaling means, for the purpose set forth.

2. In a machine of the character dethe combination wit-h adding wheels, actuators therefor, type carriers connected to the carriers, transfer or carrying mechanism controlling movement of actuators relative to type carriers and comprising detent means tripped by the adding wheels, means for resetting said detent means, and sub-totaling means controlling actuators and type carriers for setting the latter by reverse rotation of the adding wheels when actuators are abnormal relative to type carriers; of means to compensate for anovements of actuators back to normal in operation of the type carriers under control of the sub-totaling means, and means for disabling the transfer resetting means by the sub-totaling means.

3.1n a machine of the character described, the combination with adding wheels, actuators therefor, type carriers connected to the actuators, transfer or carrying mechanism controlling movement of actuators relative to type carriers and comprising means tripped by the adding wheels, means for resetting said detent means, and totaling and subtotaling means controlling actuators and type carriers for setting the latter by reverse rotation of the adding wheels when actuators are abnormal relative to type carriers; of means to compensate for movements of actuators back to normal in operation of the type carriers under control of the totaling and sub-totaling means, and means for disabling the transfer resetting means by the sub-totaling means.

4.111 a machine of the character described, the combination of adding pinions, actuating racks therefor, type carriers having lost-motion connection with said racks, transfer devices normally preventing full movement of the racks with the carriers in an adding direction, and totaling devices normally limiting movement of the carriers in the opposite direction independently of the racks.

5. In a machine of the character described, the combination of adding pinions,

, actuating racks therefor, type carriers hav ing lost-motion connection with said racks, transfer devices normally preventing full movement of the racks with the carriers in an adding direction and comprising detent means tripped by the adding wheels, totaling devices normally limiting movement of the carriers in the opposite direction independently of the racks, means for stopping the pinions at zero when turned backward, and resetting detent means for said transfer devices.

6. In a machine of the character described, the combination of adding pinions, actuating racks therefor, type carriers having lost-motion connection with said racks, transfer devices normally preventing full movement of the racks with the carriers in an adding direction, sub-totaling devices normally limiting movement of the carriers in the opposite direction independently of the racks, means for stoppin the pinions at zero when turned backwar resetting detent means for said transfer devices, and means operated by the sub-totaling devices for disabling said resetting means.

7. In a machine of the character described, the combination of adding pinions, actuating racks therefor, type carriers having lost-motion connection with said-racks, transfer devices normally preventing full movement of the racks with the carriers in am adding direction, totaling and sub-totaling means for stopping the pinions at zero when turned backward, resetting devices for said transfer detent means, and means operated by the sub-totaling devices to disable said resetting means.

8. In a machine of the character described, the combination of adding pinions, actuating racks therefor, type and rack carriers having slot-andpin connection with the racks, springs tending to move the latter independently of the carriers, means limiting reverse independent movement of carriers, means for disabling said limiting means rendered effective by movement of the racks through said springs, transfer devices for normally resisting the latter, and totaling means operating the said disabling means.

9. In a machine of the character described, the combination of adding pinions, actuating racks therefor, type and rack carriers having slot-and-pin connection with the racks, springs tending to move the latter" independently of the carriers, means limiting reverse independent movement of carriers, means for disabling said limiting means rendered effective by movement of the racks through said springs, transfer devices for normally resisting the latter, means for resetting said transfer devices, and subtotaling means operating said disabling means and disabling said resetting means.

10. In a machine of the character described, the combination of adding pinions, actuating racks therefor, type and rack carriers having slot-and-pin connection with the racks, springs tending to move the latter independently of the carriers, means limiting reverse independent movement of carriers, means for disabling said limiting means rendered effective by movement of the racks through said springs, transfer devices for normally resisting the latter, means for resetting said transfer devices,

and totaling and sub-totaling means operating said disabling means, the sub-totaling means disabling the resetting means.

11. In a machine of the character described, the combination of adding pinions, actuating racks therefor, type and rack carriers having slot-and-pin connection with the racks, springs tending to move the latter independently of the carriers, pawls normally resisting said springs and adapted to be displaced by the adding pinions, pawls normally limiting movement of the carriers independently of the racks, means for displacing the latter pawls normally out of operative relation thereto and brought into such relation by reason of displacement of the first-mentioned pawls, and totaling devices operating said displacing means.

12. In a machine of the character described, the combination of adding pinions, actuating racks therefor, type and rack carriers having slot-and-pin connection with the racks, springs tending to move the latter independently of the carriers, pawls normally resisting said springs and adapted to be displaced by the adding pinions, pawls. normally limiting movement of the carriers independently of the racks, means for displacing the latter pawls normally out of operative relation thereto and brought into such relation by reason of displacement of the first-mentioned pawls, means for resetting the latter, and subtotaling devices operating said displacing means and disabling said resetting means.

13. In a machine of the character described, the combination of adding pinions,

actuating racks therefor, type and rack carriers having slot-and-pin connection with the racks, springs tending to move the latter independently of the carriers, pawls normally resisting said springs and adapted to be displaced by the adding pinions, pawls normally limiting movement of the carriers independently of the racks, means for displacing the latter pawls normally out of operative relation thereto and brought into such relation by reason of displacement of the first-mentioned pawls, means for resetting the latter, and totaling and sub-totaling devices operating said dlsplacing means, the sub-totaling devices disabling said resetting means.

14;. In a machine of the character described, the combination of adding pinions, actuating racks therefor, type and rack carriers having slo-t-and-pin connection with the racks, springs tending to move the latter independently of the carriers, pawls normally resisting said springs and adapted to be displaced by the adding pinions, pawls on the racks normally limiting movement of the carriers independently thereof, means said springs, transfer devices for normally resisting the latter, and totaling means 0pera ting the said disabling means.

15. In a machine of the character described, the combination of adding pinions, actuating racks therefor, type and rack carriers having slot-and-pin connection with the racks, springs tending to move the latter independently of the carriers, means limiting reverse independent movement of carriers, means for disabling said limiting means rendered effective by movement of the racks through said springs, transfer de vices for normally resisting the latter, totaling means operating the said disabling means, and a zero stop member for the pinions operated by said totaling means.

16. In a machine of the character described, the combination of adding pinions, actuating racks therefor, type and rack carriers having slot-and-pin connection with the racks, springs tending to move the latter independently of the carriers, means limiting reverse independent movement of carriers, means for disabling said limiting means rendered effective by movement of the racks through said springs, transfer devices for normally resisting the latter, means for resetting said transfer devices, sub-totaling means operating said disabling means and disabling said resetting means, and a zero stop member for the pinions operated by said sub-totaling means.

17. In a machine of the character described, the combination of adding pinions, actuating racks therefor, type and rack carriers having slot-and-pin connection with the racks,-=springs tending to move the latter independently of the carriers, means limiting reverse independent movement of carriers, means for disabling said limiting means rendered effective by movement of the racks through said springs, transfer de vices for normally resisting'the latter, means for resetting said transfer devices, totaling and sub-totaling means operating said disabling means, the sub-totaling means disabling the resetting means, and a zero stop member for the pinions opefated by said totaling and sub-totaling means.

18. In a machine of the character de scribed, the combination of adding pinions, actuating racks therefor, type and rack carriers having slot-and-pin connection with the racks, springs tending to move the latter independently of the carriers, pawls normally resisting said springs and adapted to be displaced by the adding pinions, pawls normally limiting movement of the carriers independently of the racks, means for displacing the latter pavvls normally out of operative relation thereto and brought into such relation by reason of displacement of the first-mentioned pawls, totaling devices operating said displacing means, and a zero stop member for the pinions operated by said totaling means.

19. In a machine of the character described, the combination of adding pinions, actuating racks therefor, type and rack carriers having slot-and-pin connection with the racks, springs tending to move the latter independently of the carriers, pawls normally resisting said springs and adapted to be displaced by the adding pinions, pawls normally limiting movement of the carriers independently of the racks, means for displacing the latter pawls normally out of ()1)8I'tltl"8 relation thereto and brought into such relation by reason of displacement of the first-mentioned pawls, means for resetting the latter, sub-totaling devices operating said displacing means and disabling said resetting means, and a zero stop member for the pinions operated by said subtotaling means.

20. In a machine of the character de scribed, the combination of adding pinions, actuating racks therefor, type and rack carriers having slot-and-pin connection with the racks, springs tending to move the latter independently of the carriers, pawls normally resisting said springs and adapted to be displaced by the adding pinions, pawls normally limiting movement of the carriers independently of the racks, means for displacing the latter pawls normally out of operative relation thereto and brought into such relation by reason of the displacement of the first-mentioned pawls, means for resetting the latter, totaling and sub-totaling devices operating said displacing means, the

sub-totaling devices disabling said resetting means, and a zero stop member for the pinions operated by said totaling and sub-totalmg means.

21. In a machine of the character described, the combination of adding pinions, actuating racks therefor, type and rack carriers having slofland-pin connection with the racks, springs tending to move the latter independently of the carriers, pawls normally resisting said springs and adapted to be displaced by the adding pinions, pawls on the racks normally limiting movement of the carriers independently thereof, means for displacing the latter pawls rendered effective by movement of the racks through said springs, transfer devices for normally resisting the latter, totaling means operating the said disabling means, and a zero stop member for the pinions operated by said totaling means.

22. In a machine of the character described, the combination of adding pinions, actuating racks therefor, type and rack carriers having slot-and-pin connection with the racks, springs tending to move the latter independently of the carriers, pawls springdrawn to position for resisting said springs but adapted to be displaced by the adding pinions, latches for holding said pawls displaced, means for resetting the latches, subtotaling means disabling the resetting means, pawls or detents normally limiting movement of carriers independent of racks, and means for displacing the latter pawls normally out of operative relation thereto but brought into such relation by reason of displacement of the first-mentioned pawls and adapted to be operated by the sub-totaling means.

23. In a machine of the character described, the combination of adding pinions, actuating racks therefor, type and rack carriers having slot-and-pin connection With the racks, springs tending to move the latter independently of the carriers, pawls spring-drawn to position for resisting said springs but adapted to be displaced by the adding pinions, latches for holding said pawls displaced, a bail for resetting the latches, an arm for rocking the bail, a makeand-break connection between the arm and the bail, sub-totaling means adapted to break said connection, pawls or detents normally limiting movement of carriers independent of racks, and means for displacing the latter pawls normally out of operative relation theretobut brought into such relation by reason of displacement of the firstmentioned pawls and adapted to be operated by the sub-totaling means.

24. In a machine of the character described, the combination of adding pinions, actuating racks therefor, type and rack carriers having slot-and-pin connection With the racks, springs tending to move the latter independently of the carriers, pawls spring-drawn to position for resisting said springs but adapted to be displaced by the adding pinions, latches for holding said pawls displaced, a bail for resetting the latches, an arm for rocking the bail, a spring catch on the bail engaging the arm, a catch tripping member, sub-totaling means operating the latter, pawls or detents normally limiting -movement of carriers independent of racks, and means for displacing the latter pawls normally out of operative relation thereto but brought into such relation by reason of displacement of the first-mentioned pawls and adapted to be operated by the sub-totaling means.

25. In a machine of the character described, the combination of adding pinions, actuating racks therefor, type and rack carriers having slot-and-pin connection with the racks, springs tending to move the latter independently of the carriers, pawls springdraWn to position for resisting said springs but adapted to be displaced by the adding pinions, latches for holding said pawls displaced, a bail for resetting the latches, an arm for rocking the bail, a spring catch on the bail engaging the arm, a catch-tripping lever, a sub-total key, a bar operated thereby and engaging said lever, pawls or detents normally limiting movement of carriers independent of racks, and means for displacing the latter pawls normally out of operative relation thereto butbrought into such relation by reason of displacement of the first-mentioned pawls and adapted to be operated by the sub-totaling means.

26. In a machine of the character described, the combination of adding pinions, actuating racks therefor, type and rack carriers having slot-and-pin connection With the racks, springs tending to move the latter independently of thecarriers, pawls nor mally resisting said springs and adapted to be displaced by the adding pinions, pawls normally limiting movement of the carriers independently of the racks, a bail for displacing the latter paWls normally out of operative relation thereto and brought into such relation by reason of displacement of the first-mentioned pawls, and totaling devices operating said bail.

27. In a machine of the character described, the combination of adding pinions, actuating racks therefor, type and rack carriers having slot-and-pin connection With the racks, springs tending to move the latter independently of the carriers, pawls normally resisting said springs and adapted to be displaced by the adding pinions, pawls normally limiting movement of the carriers independently of the racks, a bail for displacing the latter pawls normally out of operative relation thereto and brought into such relation by reason of displacement of the first-mentioned pawls, a total key, and an arm operated thereby and connected to said bail.

28. In a machine of the character describ'ed, the combination of racks; pinions movable out of and into engagement there- With; type and rack carriers having slotand-pin connection with the racks; springs for moving the latter relative to the racks;

pawls normally resisting such movement;

means holding the pinions disengaged from the racks during movement of the latter from normal and engaged therewith during return movement of the racks, the pinions being equipped to displace said pawls When being turned by such return movement of the racks; latches for holding pawls displaced; a total key and connections for reversing the periods of engagement and disengagement of racks and pinions,-releasing the, racks to move distances determined by backward turning of the pinions; a stop member connected to said total key so as to be moved thereby into effective position to limit backward turning of said pinions; pawls or detents on the racks normally limiting movement of the carriers independently thereof away from normal; and a bail for displacing said pawls or detents, said bail connected to said total key, and said detents normally out of position to be acted upon by the bail but carried to such position by reason of displacement of the firstmentioned pawls and resultant movement of the racks backward beyond normal.

29. In a machine of the character described, the combination of racks; pinions movable out of and into engagement there with; type and rack carriers having slotandpin connection with the racks; springs for moving the latter relative to the racks; pawls normally resisting such movement; means holding the pinions disengaged from theracks during movement of the latter from normal and engaged therewith during return movement of the racks, the pinions being equipped to displace said pawls when being turned by such return movement of the racks; latches for holding pawls displaced; a total key and connections for reversing the periods of engagement and disengagement of racks and pinions,releasing the racks to move distances determined by backward turning of the pinions; a stop. member connected to said total key so as to be moved thereby into effective position to limit backward turning' of said pinion s;

[SEAL Corrections in Letters Patent No. 1,016,308.

1,01e,a-es

pawls or detents on the racks normally limiting movement of the carriers independently thereof away from normal; a bail for displacing said pawls or detents, said bail connected to said total key, and said detents normally out of position to be acted upon by the bail but carried to such position by reason of displacement of the first-mentioned pawl and resultant movement of the racks backward beyond normal; a sub-total key having a bar engaged with the total key to operate the latter and equipped to prevent disengagement of the pinions from the racks forthe latters return to normal; a bail for resetting the before-mentioned latches; an arm for operating said bail; a catch connecting the arm and last-mentioned bail, and catch-displacing means connected to said sub-total key bar.

30. In a machine of the character described, total and sub-total keys, the former depressible independently of the latter but depressible by it, said sub-total key having a bar with a spur and the total key a stud to lock the sub-total key by engagement with said spur.

CHARLES H. WALKER. Witnessesf J. G. VINCENT,

ARTHUR YV. FRnNznL.

It is hereby certified that in Letters Patent No. 1,016,308, granted February 6, 1912, upon the application of Charles H. Walker, of Detroit, Michigan, for an improvement in Adding and Listing Machines, errors appear in the printed specification requiring correction as follows: Page 4, line 128, and page 5, line 11, strike out the words detent means and insert devices; same pages, lines 129 and 11-12, strike out the word devices and insert the words detect means; page 5, lines 6 and 21, after the word direction, insert the words and comprising detent means tripped by the adding wheels, and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Signed and sealed this 5th day of March, A. D., 1912.

(J. C. BILLIN GS,

Acting Commissioner of Patents.

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