Patent GB-139576-A (GB)
Abstract: 139,576. Vermehren, J. Feb. 11, 1919. Multiplying and dividing apparatus.-In multiplication calculating-machines of the pin-wheel and cam-disk type wherein the result is obtained by the summation of the partial products on a totalizing-counter, provision is made for the setting of the two factors in their entirety before the machine is operated. The figures of the two factors remain visible during and after the operation, which may be effected by a handle or by a motor adapted to be stopped automatically when the calculation is completed. The multiplier is set on members 1, Fig. 2, composed of disks 2, 3, of which the disks 3 are fixed upon the shaft 4, and the disks 2, bearing the numerals and provided with cam-grooves, are relatively movable thereto, so that tappets 11 attached to pins 9 may be moved into inoperative position, the number so moved depending on the numeral set. On the shaft 4 is fixed a wheel 15 with teeth on half of its periphery adapted to engage a pinion 16 and thereby, through gearing 17, 18, to rotate the shaft 24, carrying the multiplicand Getting- elementis, three tines for each revolution of the shaft 4. Each of the disks 22 corresponding with the disks 2 has three series of pins 29 which form teeth 63 adapted to become operative by the relative rotation of the disks 22, 23 so as to engage the pinions 33 of the totalizing-counter; the teeth 63 pass the pinion 33 once for each tappet that is moved to the inoperative position. On the shaft 4 is mounted a two-toothed wheel 62 adapted to engage a ten-toothed pinion 61 on a shaft 14, which is provided with a series of staggered arms, one for each denomination in the multiplier, adapted to meet the operative tappets 11 so as to shift laterally the shaft 14 and thereby, through an arm, to shift the series of disks 22, 23 longitudinally to move the teeth out of alinement with the pinions 33. The totalizing- counter is moved longitudinally by means of a threaded shaft 32 which is rotated by a pinion 31 gearing with a wheel 30 having teeth on half of its periphery, and which is operative while the wheel 15 is inoperative. The normal position of the parts is shown in Fig. 6, where one-half of the teeth of the wheel 30 have passed the pinion 31. During an operation, the remaining teeth cause the shaft 32 to rotate to move the pinions 33 into alinement with the teeth of the disks 22; on the completion of a revolution, the parts are again as shown in Fig. 6, the totalizing-counter having been moved to the extent of one denomination. Overthrow-preventing mechanism. - To lock the members when they are not in operation, Geneva wheels and disks are provided. Overthrow of the totalizing-counter wheels is prevented by wedge-shaped members 56, 57 mounted on members 55 engaging alternatively the toothed spaces of the gear-wheels 34. Transfer mechanism.-The numeral-wheels 35 of the totalizing-counter have each a tappet 43 which, when transfer is to be effected, moves to the left, Fig. 2, by means of an arm 45, a sleeve 46 so as to bring the pinion 33 into alinement with a wheel 40 on a shaft 37, Figs. 1 and 7, rotated by gearing through a mutilated wheel 39 on the shaft 24. The mutilated wheel 39, which is slidably mounted .on the shaft 24, acts during the time that the teeth 63 are out of engagement, and a tooth 48 on the wheel 40 effects the transfer. To each of the wheels 40 is secured a disk 41 having a tappet 42 adapted to engage an arm 64 on the sleeve 46 to return the sleeve to normal position. Zeroizing-mechanism. - The return of the totalizing-counter wheels 35 to zero position is effected by the rotation of the operating-handle in the reverse direction to that when performing a calculation, and a tooth 52 on the wheel 40 serves to delete the figures carried over.