US1903179A - of chemnitz - Google Patents

Description

Patented Mar. 28, I 1933 UNITED STATES PATENT OFFICE JOHN 1am WILLIAM GREVE, OF CHEMNITZ, GERMANY, ABSIGNbIR TO ASTRAWERKE AKTIENGESELLSCHAFT, OF CHEMNITZ, GERIANY cancumrmo momma Application filed July 15, 1981, Serial No. 550,956, and in Austria May 88, 1981.

It is known to construct counting mechanisms with addition and subtraction actions as reversing gears, the counting wheels cooperating in pairs, and being adapted to be brought into operative relationship with driving means selectively, in such a way that the driven wheel is rotated in one direction and the other wheel in the opposite direction. The counting wheels are equi ped with shifting cams for the carrying o tens, and these shifting cams act upon shifting noses on a tens carrying pawl. In the case of these counting mechanisms a separate shifting nose has hitherto been provided for each counting wheel, but this has the advantage that the shifting is efiected more easily by one nose than by the other. The adjusting of such a counting mechanism is also rather complicated.

The invention consists in arranging a reversing gear, in which the tens shifting of both counting wheels is eflected only from a single shifting nose of the tens carrying lever. In consequence of this arrangement, the tens carrying requires the same expenditure of power for both kinds of calculation, and furthermore, owing to the arrangement of the counting wheels as a whole, the driving members are shorter.

A counting mechanism according to the in vention is illustrated in the accompanying drawing, in which Fi ure 1 shows a counting mechanism with a rac drive, and

Figure 2 a counting mechanism with a sector drive.

On the type bars 1 of the machine, which are moved up and down in a known manner durin one stroke of the machine, racks 2 are displaceably fitted in longitudinal slots 3 and 4, and are normally held in the osition shown in Figure 1 by a spring 5. C unting wheels 6 and 7 are mounted upon their pivots 8 and 9 in a counting mechanism frame 10, which is rotatable about a shaft 11. A downwardly projecting arm 12 of the counting mechanism frame is provided with a slot 13, in which there engages a pin 14 which is riveted into a crank arm 15. The crank arm 15 is pinned to a rotatable shaft 16, which is romounted upon a stationary shaft 21, and the lower end 22 of each is constructed as a pawl with two steps, which cooperates with a ratchet lever 23, which is constantly ulled downwards by a spring 23. It will immediately obvious from the drawing that this ratchet lever is set free as soon as the nose 19 of the tens carrying lever is pressed back, and that the driving rod 2 can then follow the pull of its spring 5, as a result of which the toothed wheel that is for the time being in mesh is rotated one division forwar In this manner the carrying of tens for example takes place in all the decimal places, if the counting mechanism contains a continuous series 0 nines and a number is added thereto in the units column. Otherwise the method of working of the parts described is as follows When the type bar 1 is moved upwards, its

lower end being rocked in such a manner that the racks 2 are out of engagement with the toothed wheels, the spring 5 pulls the rack 2 into its lower position. During the d0wnstroke of the type bar, the rack 2 is brought into engagement with the toothed wheel, and this wheel is rotated a number of teeth that corresponds to the numeral inserted. Now

March 28, 1933. J. E. w. GREVE CALCULATING MACHINE Filed July 15 1931 i Jul/@1260)".- H 5 14 gram addition and one for subtraction, oo-operating with one another upon several axes as a reversin gear, driving means for the counting whee s, means to bring either of the count- 5 ing wheels into engagement with the driving means at will, a carrying cam on each of the counting wheels, and a single carrying nose upon the tens carr ing lever adapted to be directly operated y the carrying cam on whichever of the counting wheels is for the time being engaged by the driving means. V 2. Counting mechanism for calculating and registering machines, comprising a movable frame, a pair of counting wheels mounted upon several axes in said movable frame and co-operating with one another as a reversing gear, one wheel of each pair being for addltion and the other for subtraction, driving means for the counting wheels, means for shifting the movable frame in such a way as to bring either of the counting wheels mounted therein into engagement with the driving means at will, a carrying cam on each of the counting wheels, and a single carryin nose on the tens carrying lever adapted to directly operated by the carrying cam on whichever of the counting wheels is for the time being engaged by the driving means.

In testimony whereof I have signed my name to this specification.

JOHN EMIL WILLIAM GREVE.

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