US1445461A

US1445461A - Revolutions counting mechanism for calculating machines

Info

Publication number: US1445461A
Authority: US
Publication date: 1923-02-13
Anticipated expiration: 1940-02-13

Description

Feb. 13, 1923.

F. THINKS.

4 SHEETS-SHEET I.

FILED JULY 19, I920.-

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F. TRINKS.- REVOLUTIONS COUNTING MECHANISM FOR CALCULATING MACHINES.

FILED JULY 19. 1920. 4 SHEETS-SHEET 2.

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, F. TRINKS.

REVOLUTIONS coummc MECHANISM FOR CALCULATING MACHINES.

FILED JULY 19. 1920- 4 SHEETSSHEET 3,

Patented Feb. 13, 1923.

1 UNITED STATES PATENT OFFICE.

FRANZ TBINKS, OF BRUNSWICK, GERMANY.

Application filed July 19, 1920. Serial N0. 397,330.

To aZZ whom it may concern:

Be it known that I, FRANZ TRINKs, residing at Brunswick, Republic of Germany, have invented certain new and useful Improvements in Revolutions-Counting Mechanisms for Calculating Machines, of which the following is a specification.

My invention relates to improvements 1n revolutions counting mechanisms for calculating machines, and more particularly in mechanisms of that type in which each of the numeral wheels is provided with two series of numbers from 1 to 9 and the zero sign arranged in opposite order .about its circumference and displaced relatively to each other a distance corresponding to one value. in mechanisms of this type automatic means are provided for shifting the revolutions counting mechanism one value when the machine is set from the zero of the addition or multiplication series to the zero of the subtraction or division series. One of the objects of the improvements is to provide simple and reliable means for thus shifting the revoiutions counting mechanism. With this and other objects in-view my invention consists in the matters to be described hereinafter and particularly pointed out in the appended ciaims.

For the purpose of explaining the invention an example embodying the same has been shown in the accompanying drawings, in which the same letters of reference have been used in all the views to indicate corresponding parts. In said drawings,

Fig. 1, is a. front view partly in section,

Fig. 2, is a cross-section of the registering mechanism the numeral wheels,

Fig. 3, is a front view of the machine with the wall of the casing partly removed and showing means for automatically setting the peep hole slide,

Figs. 4 and 5, are detaii views of the mechanism shown in 3,

Figs. 6, 7 and 7 are detail views showing means for indicating the manner in which .zeros have been set behind the peep holes of the revolutions counting mechan era, the indicating means being shown in different positions,

Figs. 8 and 9, are plan views respectively of Figs. 6 and 7,

Fig. 10, is a partial plan view showing means for locking the peep hole slide in its end positions, and

'sponding to'one value, so that the Fi Fig.

In the example shown in Figs; 1 and 2 the revolutions counting mechanism consists of numeral wheels 1 each of which has two series of numbers from 1 to 9 and the zero sign arranged about its circumference, the numbers of adjacent series being arranged in reverse order, and the series being displaced relatively to each other a distance correzero sign of oneserl'es corresponds to the 9 of the adjacent series. The right hand series in which the numbers are arranged in ascendmg order is used for performing additions and multiplications, and the left hand series is used for performing subtractions and divisions. The revolutions counting mechanism is adapted to be operated by means of a single tooth wheel 24 which is coupled with the shiftable carriage or slide carrying the registering mechanism for taking part in the movement of said slide, and the single tooth wheel is adapted to operate the numeral wheels through the intermediary of gear wheels 7 and gear wheels 1 secured to the numeral wheels. The carrying operation is performed by means of rocking levers 2 which are adapted to be rocked by pins 3 provided on the numeral wheels into the paths of pins 4 having rocking supports on disks 5 keyed to a main shaft 6. The main shaft is adapted to be turned by means of a hand operated crank (not shown). The

pins

11 and 12, are cross-sections of 4 are adapted to be rocked by cam members 9 into positions for engagement with the intermediate gear wheels 7 for carrying a value to the next numeral wheel 1 whenever a counting disk. is shifted in the course of performing additions or multiplications from the 9 position to the 0 position, or in case of subtractions or divisions from the 0 to the 9 position.

lhe parts so far described are as shown in prior United States Patents 1,072,324 and 1,134,780 known the art and will therefore be understood from the foregoing cursory description.

Whenever the machine is set from the 0 of the addition multiplication series of numbers to the 0 of the substraction and division series of numbers the revolutions counting mechanism must be advanced one value. For this purpose an additional shifting lever 8 is provided in front of the first numeral wheel 1 the construction of which is the same as that of the carrying levers 2, and the said lever cooperates with an operating member such as a pin 14 having a rocking support on a drivin disk 15 and adapted to be rocked in lateral irection by the cam face 9 of the lever 8 and into position for engagement with a subsidiary intermediary gear wheel 12 cooperating with the first numeral wheel 1 and to advance the revolutions counting mechanism when the mechanism is set from the 0 of the addition series of numerals to the 0 of the subtraction series. The lever 8 is rocked from the normal position shown in the figures into the operative position by a pin 10 which is rigidly secured to a disk 11 keyed to the resetting shaft 13.

When resetting the revolutions counting mechanism by means of a wing nut 16 at the end of a calculating operation, the pin 14: is set by the lever 8 and the pin 10 so as to advance the revolutions counting mechanism a distance corresponding to one value .through the intermediary of the gear wheel 12 upon the first operation of the main shaft 6 in the direction for performing'a subtraction or division. When the disk 15 is further rotated in the same direction a cam face 20 formed on a lug 22 gets into operation for returning the lever 8 into the normal position shown in Fig. 1.

When operating the shaft 6 in the direction for performing an addition or multiplication no additional movement is imparted to the revolutions counting mecha nism. Therefore, before the rockable tooth 1% gets into operative position the lever 8 is returned into normal position by means of a cam face 21 of the lug 22, which lever had been set in operative position by the previous resetting operation.

When setting the mechanism from one series of numerals to the other one the slide 23 formed with the peep holes must be set accordingly. For this purpose I prefer to pro.- vide the mechanism shown in Figs. 3-5.

As shown in the said figures, the resetting shaft 13 carries a disk 26 having a pin 27.

secured thereto, and when turning the shaft 13 for resetting the mechanism the said pin rocks a shift lever 28 in the direction of the arrow y. The said lever 28 is similar in construction and arrangement to the carrying levers 2 of therevolutions counting mechanism 1. The pinf27 rocks the lever 28 into operative position in which its cam face 29 is in the path of a rockable operating member 30 taking part in the rotation of the main shaft 6 of the machine. Thereby the operating member 30 is rocked laterally and into position for engaging upon rotation a bevelled face 31 set in its path and for shifting the same laterally and in the direction of the arrow 00 shown in- Fig. 3. The said bevelled face is formed on a rod 32 and divisions.

connected with the peep hole slide 23 which is therefore shifted in the same direction and in such a way that the peep holes 33 are in positions for displaying the left hand series of numbers corresponding to subtractions position, until upon another resettin operation of the revolutions counting mec iamsm a cam disk 34 of the resetting shaft 13 returns the peep hole slide 23 into the position shown in Fig. 3, by engaging a pin 35 provided on the peep hole slide.

As shifting of the slide 23 is necessary only when the mechanism is set from position for performing additions and multiplications into position for performing subtractions and divisions, the disk 36 which carries the rockable operating member 30 is formed with a lug 37, as is shown in Fig.5, and upon rotation of the driving shaft 6 in a direction for performing additions or multiplications the cam face 38 of the lug 37 returns the rocking lever 28 from its operative position into inoperative osition, so that the operating member 30 oes not get into action. The cam face 39 provided on the lug 37 has the function to return the operating lever 28 into normal position, when the operating member 30 by being turned in the direction for performing a subtraction or division has shifted the peep hole slide 23.

In my improved calculating machine the mechanism is set from position for performing subtractions or divisions into position for performing additions or multiplications, or vice versa, only after the value displayed through the peep holes has been reset, because when passing from the zero of the multiplication series to the subtraction or division series an additional rotation of the units wheel of the revolutions counting mechanism ,is necessary which is derived from the resetting mechanism, which rotation is not performed when performing additions or multiplications. If the revolutions counting mechanism displays zeros, it can not be ascertained from without, whether the said zeros have been set behind the peep holes by the resetting operation or by turning the numeral wheels into zero positions by means of the operating means of the revolutions counting mechanism. As will be understood from the foregoing description, by the resetting operation the additional shifting movement of the revolutions counting mechanism is prepared, so that the said additional shifting movement is effected when the next operation of the crank in the direction for performing a division or subtraction is effected. If, however, the zeros have The slide 23 remains in this been set behind the peep holes by turning the not prepared, and it is therefore not effected by. the operation .of the crank. As the operator must be familiar with these conditions in order to obtain correct results when performing the calculations, indicating means are connected with the resetting mechanism of the revolutions counting mechanism or the parts operatively connected therewith for preparing the additional shifting movement of the said mechanism and the said indicating means show whether or not a subtraction or division can correctly be made.

The preferred construction of the indicating means s shown in Figs. 6-9. The

, operating lever 8 which is adapted to be set by the resetting mechanism, and more particularly by the shaft 13, the disk 11, and the pin 10, from the inoperative position shown in Fig. 6 downwards and into the operative position shown in Fig. 7 is connected by an arm 40 with a push rod 41 mounted in a suitable guide way and formed at its upper end with a bevel face 42 engaging a similar bevel face 44 formed on a pin 43 secured to a slide 45. The said slide is guided on

pins

46 and 47 provided at the lower side of the cover 48 of the casing of the calculating machine, and it is acted upon by a spring 49 so as to hold the bevel faces 42 and 44 in engagement with each other. From the slide an arm 50 extends downwards and substantially to the height of the peep holes of the revolutions counting mechanism, and the said arm carries a suitable indicating mark 51, such for example as the minus sign, which is displayed through a special peep hole 52 made in the cove-r 48 of the casing of the machine.

As by resetting the revolutions counting mechanism the lever 8 has been rocked from the position shown in Fig. 6 into the position shown in Fig. 7, the slide 45 has also been shifted from the position shown in Fig. 3 into that shown in Fig. 9 in which the minus sign 51 is displayed. This indicates that now a subtraction or division can he made. By the first operation of the crank the lever 8 is returned into the position shown in Fig. 6. in which position the minus sign 51 is invisible, as appears from Fig. 8. This indicates that a correct division can not be made. Preferably the corresponding part of the slide is painted red.

The peep hole slide 23 which covers the two series of numbers of the numeral wheels 1 is automatically shifted into the position corresponding to the calculating operation being performed. As has been described with reference to Figs. 3-5, a shift pin 27 is provided which is operative during the resetting operation of the revolutions counting mechanism to set a bevel face 29 into the path of a rockable operating member 30 which revolves with the driving shaft 6 of the calculating machine and when thus rotated shifts the peep hole slide 23. Furthermore, a controlllng member 37 is connected with the driving shaft 6 which is adapted to act on the bevel face 29 and permits operation of the operating member 30 by the member 29 only in the direction for performing a substraction or division. These parts are also shown in Fig. 11.

In the construction so far described the pee-p hole slide 23 is unlocked in its end positions, so that it can be shifted by hand or by accident. As this is objectionable, I prefer to provide means for locking the peep hole slide 23 in its end positions and for releasing the same when the proper operation of the machine requires the slide to be shifted.

To show what may be done I have shown two locking

pawls

53 and 54, the pawl 53 being adapted to lock the slide 23 in the addition or multiplication position shown in Fig. 10, and the pawl 54 being adapted to lock the slide in the opposite position which corresponds to substractions and divisions. The

pawls

53 and 54 are so connected, respectively with the shaft 6 and the resetting shaft 13, that they are thrown out of locking positions before the slide is shifted.

In the partial plan view shown in Fig. 10 the slide 23 has been shifted to the right and into the position in which it displays the right hand series of numbers of the numeral wheels 1 which is used when making additions and multiplications. The figure shows only one pair of the said series. At the end of a resetting operation the parts are always in the position shown, and in this position the slide 23 is locked by the spring actuated pawl 53 engaging a shoulder formed on a guide plate 55 located below the cover of the casing and rigidly connected with the slide 23.

if with the parts in the position described a a I 7 the shaft 6 is rotated in the direction for performing an addition or multiplication, that is to the right in Fig. .11, 1s indicated in the said figure by the arrow marked by a sign, the slide is not shifted and it is not necessary to throw the locking means out of operation.

if, however, the shaft 6 is turned in the direction for performing a subtraction or division, that is to the left in Fig. 11, and in the direction of the arrow marked by the sign, the peep hole slide 23 is shifted to the left, and it is necessary at first to set the locking pawl 53 in non-locking position. This is effected by means of the member which shifts the slide, that is the rockable operating member 30, which lifts the pawl 53 out of locking engagement with the plate 55 before shifting'the slide. In the example shown in the fi ures the operating member 30 is not direct y connected with the slide 23 for shifting the same, as has been described with reference to Figs. 3-5, but through an intermediary mechanism consisting 'of a disk 57 which is loosely mounted on the resetting shaft and which is provided with teeth 56 engaging in the teeth of a gear wheel 58, actuated by engagement with the teeth thereof, of the element 30, rotatably carried by the shaft 6 and moved to swung out position by the inclined surface 29 of the hammer 28, in the rotation of the shaft 6 in the subtraction and divi sion direction, that is in the direction of the minus arrow in Figure 11. The said disk 57 is provided with a bevelled lug 6O cooperating with a lug 59 secured to the slide 28 for shifting the said slide and with a lug 61 which is adapted, before the lug gets into operation, to engage a pin 53 secured to the locking pawl 53 so as to lift the said pawl out of locking position, so that the slide 23 can be shifted to the left. A spring 62 tends to return the disk 57 into initial position in which it is locked by a spring actuated pawl 63.

After the slide 23 has'thus been shifted it is locked by the spring pressed pawl 54: engaging in a notch 64 formed on a guide plate 65 secured to the slide 23, and it is held in locked position when after the first rotation to the left-the shaft is again turned to the left or to the right, because in both cases the slide 23 remains in the position corresponding to divisions, and it is unlocked only when resetting takes place, in which case a bevelled lug 66 strikes on a nose 67 of the slide 23 and returns the same into the right hand position shown in the figure. Unlocking is effected by means of a disk 68 secured to the shaft 13 and formed with a notch 68 which notch is engaged in the locking position of the pawl 54 by an arm 54 of the said pawl. When turning the shaft 13 and the disk 68 the pawl 5t, 54 is rocked into the position shown in Fig. 1 in which the slide 23 is unlocked.

It will be understood that the various mechanisms shown for clearness sake in separate figures are preferably combined in the same machine for obtaining the best results, and that also the modification of the means for operating the peep hole slide are preferably combined with the mech anisms shown in other figures.

I claim: 1. In a calculating machine, the combination with the registering mechanism, and the revolutions counting mechanism comprising numeral wheels each having twoseries of numbers arranged in opposite order and displaced relatively to each other, carrying mechanisms, and resetting mechanism, of a normally inoperative operating member actuated upon operation of the b ,u o n reglstermg mechanism and adapted when in the revolutions counting mechanism comprising numeral wheels each having two series of numbers arranged one beside the other in oppositeorder and displaced relatively to each other, carrying mechanisms, and resetting mechanism, of a normally inoperative operating member actuated upon operation of the registering mechanism and adapted when in operative position to advance the revolutions counting mechanism, a cam member adapted to be set in the path of said operating member and the same in operative to set position, and means connected withthe resetting mechanism and adapted to set said cam member in the path ofsaid operating member.

.3. In a calculating machine, the combination with the registering mechanism, and the revolutions counting mechanism comprising numeral wheels each having two series of numbers arranged in opposite order and displaced relatively to each other, carrying mechanism, and resetting mechanism, of a normally inoperative operating member actuated upon operation of the registering mechanism and adapted when in operative position to advance the revolutions counting mechanism, means controlled by the resetting mechanism and adapted to set said operating member in operative position, and automatic means operative after said operating member to return said means controlled by the resetting mechanism into inoperative position.

a. In a calculating machine, the combination with the registering mechanism, and the revolutions counting mechanism comprising numeral wheels each having two series of numbers arranged vin opposite order and displaced relatively to each other, carrying mechanism, and resetting mechanism, of a rotary disk carrying a normally inoperative operating member and rotated upon operation of the registering mechanism, said operating member being adapted whenin operative position to advance the revolutions counting mechanism, means controlled by the resetting mechanism and adapted to set said operating member in operative position, and automatic means mounted on said rotary disk and operative after said operating member to return said means controlled by .the resetting mechanism into inoperative position.

5. In a calculating machine, the combination with the registering mechanism, and the revolutions counting mechanism comprising numeral wheels each having two series of numbers arranged in opposite order and displaced relatively to each other, carrying mechanism, and resetting mechanism, of a normally inoperative operating member actuated upon operation of the registering mechanism and adapted when in operative position to advance the revolutions counting mechanism, a cam member adapted to be set in the path of said operating member and to set the same in operative position,

' means connected with the resetting mechanism and adapted to set said cam member in the path of said operating member, and automatic means operative upon 0 eration of the registering mechanism and a er said operating member to return said cam member into ino erative position.

6. In a ca culating machine, the combination with the registering mechanism, and the revolutions counting mechanism comprising numeral wheels each having two series of numbers arranged in opposite order and displaced relatively to each other, carrying mechanism, and resetting mechanism, of a rotarydisk carrying a normally inoper ative operating member and rotated upon operation of the registering mechanism, said operating member being adapted when in operative position to advance the revolutions counting mechanism, a cam member adapted to be set in the path of said operating member and to set the same in operative position, means connected with the resetting mechanism and adapted to set said cam member in the path of said operating member,-and automatic means mounted on said rotary disk and operative upon operation of the registering mechanism and after said operating member to return said cam member into inoperative position.

7. In a calculating machine, the combination with the registering mechanism, and the revolutions counting mechanism, comprising numeral wheels each having two series of numbers arranged in opposite order and displaced relatively to each other, carrying mechanisms, and resetting mechanism, of. a normally inoperative operating member actuated upon opertion of the registering mechanism and adapted when in operative position to advance the revolutions counting mechanism, means controlled by the resetting mechanism and adapted to set said operating member in operative position, and means operative when performing additions or multiplications and before the revolutions counting mechanism is advanced by said operating member to return said means controlled by the resetting mechanism into inoperative position.

8. In a calculating machine, the combination with the registering mechanism, and the revolutions counting mechanism comprising numeral wheels each having two series of numbers arranged in opposite order nation with the registering mechanism, and

and displaced relatively to each other, carrying mechanism, and resetting mechanism, of a rotary disk carrying a normally inoperative operating member and rotated upon operation of the registering mechanism,said operating member being adapted when in operative position to advance the revolutions counting mechanism, a cam member adapted to be set in the path of said operating member and to set the same in operative position, means connected with the resetting mechanism and ada ted to set said cam member in the path 0 said operating member, and automatic means mounted on said rotary disk and operative upon operation of the registering mechanism and after said operating memberto return said cam member into inoperative position.

9. In a. calculating machine, the combithe revolutions counting mechanism comprising numeral Wheels each having two series of numbers arranged in opposite order and displaced relatively to each other, means adapted to be set in position for displaying one or the other of the series of numbers of the numeral wheels, carrying mechanisms, and resetting mechanism, of a normally inoperative operating member actuated upon operation of the registering mechanism and adapted when in operative position to shift the revolutions counting mechanism, means controlled by the resetting mechanism and adapted to set said operating member in operative position, and means controlled by the resetting mechanism and adapted to set said operating member in operative position, and means controlled by the resetting mechanism to set said displaying means.

10. In a calculating machine, the combination with the registering mechanism, and the revolutions counting mechanism comprising numeral wheels each having two series of numbers arranged in opposite order and displaced relatively to each other, means adapted to be set in position for displaying one or the other of the series of numbers of the numeral wheels, carrying mechanisms, and resetting mechanism, of a normally in- 115 operative member actuated upon operation of the registering mechanism and adapted when in operative position to shift the revolutions counting mechanism, means controlled by the resetting mechanism and 120 adapted to set said operating member in operative position, and means controlled respectively by said registering mechanisms and by said resetting mechanism to shift said displaying means.

11. In a calculating machine, the combination with the registering mechanism, and the revolutions counting mechanism comprising numeral wheels each having two der and displaced relatively to each-other, means adapted to be 'set in position for dis-. playing one or the other of the seriesof numbers of the numeral wheels, carrym mechanisms, and resetting mechanism, 0 automatic means controlled by the resetting mechanism to ,7 advance the revolutions counting mechanism, normally inoperative means actuated upon operatlon of the registering mechanism and adapted to set .sa1d displaying means, and means controlled by said resettin mechanism to'set sa d means for setting t e displaying means 1n operative position.

12. In a calculating machine, the comb1- nation with the registering mechanism and the revolutions counting mechanism comprising numeral wheels each having two series of numbers arranged in opposite order and displaced relatively to each other,

meansadapted to display one or the other of the series of numbers of the numeral wheels, carrying mechanisms, and resetting mechanism, of a bevelled member connected with said displaying means for operation thereof, a normally inoperative member adapted for cooperation with said bevelled member and movable with the registering mechanism, and a' cam member controlled by the resetting mechanism and adapted upon operation of the resetting mechanism o be set in position for setting the member cooperating With'the bevelled member in operative position. p v

13. In a calculating machine, the combination with the registering mechanism, and the revolutions counting mechanism comprising numeral wheels each having two series of numbers arranged in opposite order and displaced relatively to each other, means adapted to display one or the other of the series of numbers of the numeral Wheels, carrying mechanisms, and resetting mechanism, a bevelled member connected with said displaying means for operation thereof, a normally inoperative member adapted for cooperation with said bevelled member and movable with the registering mechanism, a cam member controlled by the resetting mechanism and adapted upon operation of the resetting member to be set in position for setting the normally inoperative member in position to cooperate with said beveled member, and means operative subsequent to the cooperation of said normally inoperative member with said beveled member, to return said cam member into inoperative position.

14. In a calculating machine, the combination with the registering mechanism, and the revolutions counting mechanism comprising numeral wheels each having two series of numbers arranged in opposite order and displaced relatively to each other,

shiftable means adapted to display one or the other of the series of numbers of the I numeral wheels, carrying mechanisms, and resetting mechanism, of a bevelled member connected with said displaying means for operation thereof, a normally inoperative member adapted forcooperation with said bevelled member and movable'with the regtive position, and means operative when actuatin the re istering mechanism for performmg additions or multiplications to return said cam member to an inoperative position prior to its setting of the normally inoperative member into position to cooperate with said beveled member.

15. In a calculating machine, the combination with the registering mechanism, and the revolutions counting mechanism comprising numeral wheels each having two series of numbers'arranged in opposite order and displaced relatively to each other, shiftable means adapted to display one or the other of the series of numbers of the numeral wheels, carrying mechanisms, and resetting mechanism, of a bevelled member connected with said displaying means for operation thereof, a disk carrying a normally inoperative member adapted for cooperating with said bevelled member and movable with the registering mechanism, a cam member contrplled by the resetting mechanism and adapted upon operation of the resetting member to be set in position for setting the normally inoperative member in operative position, and means mounted on said disk and operative when actuating the registering mechanism for performing additions or multiplications to return said cam member into inoperative position prior to its setting of the normally inoperative member into position to cooperate with said beveled member.

16. In a calculating machine, the combination With the registering mechanism, and the revolutions counting mechanism comprising numeral wheels each having two series of numbers arranged in opposite order and displaced relatively to each other,

carrying mechanisms, and resetting mecha- I nism, of a normally inoperative revolving operating member actuated upon operation of the registering mechanism and adapted when in operative position to advance the revolutions counting mechanism, 'a cam member adapted to be set in the nath of said operating member and to set the same in operative position, means connected with the resetting mechanism and adapted to set said cam member in the path of said operating member, and indicating means connected with said cam member and adapted to be set thereby in indicating position.

17. In a calculating machine, the combination with the registering mechanism, and the revolutions counting mechanism comprisin numeral wheels each havin two series o numbers arranged in opposite order and displaced relatively to each other,'carrying mechanisms, and resetting mechanism, of a normally inoperative operating member actuated upon operation of the registering mechanism and adapted when in operative position to advance the revolutions counting mechanisms, means controlled by the resetting mechanism and adapted to set said operating member in operative osition, and a slide provided with an in icating ark and controlled by the resetting mechanism and adapted to be set thereby in indicating position.

18. In a calculating machine, the combination with the registering mechanism, and

the revolutions counting mechanism comprising numeral wheels each having two series of numbers arranged in opposite order and displaced relativelyto each other, and resetting mechanism, of means adapted to display one or the other of the series of numbers of the numeral wheels, means controlled by the resetting mechanism to set said displaying means in displaying position relatively to one or'the other of said series of num rs, means to hold said displaying.

means in its displaying positions, and means actuated respectively upon operation of the registering mechanism and the resetting mechanism and prior to said setting means for the displaying means to set said holding means in releasing position.

19. In a calculating machine. the combination with the registering mechanism, and the revolutions counting mechanism comprising numeral wheels each having two series of numbers arranged in opposite order a and displaced relatively to each other,

means adapted to be set in position for displaying one or'the other of the series of numbers of the numeral wheels, carryin mechanisms, and resetting mechanism, 0% automatic means controlled by the resetting mechanism to shift the revolutions counting mechanism, normally inoperative means ac tuated upon operation of the registering mechanism and adapted to set said displaying means, means controlled by said resetting mechanism to set said means for setting the displaying means in operative position, means to lock said displaying means in its displaying positions, and means controlled by the combined action of said resetting and registering mechanisms to throw said locking means in non-locking position.

for setting the same in one 0 said displaying positions, and means on said disk operative when performing subtractions and divisions and before the displaying means are set by said disk for throwing said locking means in non-locking position.

21. In a calculating machine, the combination with the registering mechanism, and the revolutions counting mechanism comprising numeral wheels each having two series of numbers arranged in opposite order and displaced relatively to each other, and resetting mechanism, of means adapted to display one or the other of the series of numbers of the numeral wheels, means to set said displaying means in position corresponding to subtractions andmultiplications, a spring actuated locking pawl adapted to lock said displaying means in set position, a cam disk rotatable with the resettin mechanism to set said locking means in nonlocking position, and means controlled by the resetting mechanism to set said displaying means in position corresponding to additions and multiplications.

22. In a calculating machine. the combination with the registering mechanism, and the revolutions counting mechanism comprising numeral wheels each provided with two series of numbers, of means adapted to display one or the other of the series of numbers of the numeral wheels, means controlled by the resetting mechanism to set said displaying means in displaying position relatively to one or the other of said series of numbers, means to hold said displaying means in its displaying positions, and means actuated respectively upon operation of the registering mechanism and the resetting mechanism and prior to said setting means for the displaying means to set said holding means in releasing position.

In testimony whereof'I aflix my signature in presence of two witnesses.

. FRANZ THINKS.

Witnesses L. BINDER, AUG. HEINSOTH.