Patent GB-437743-A (GB)
Abstract: 437,743. Calculating- apparatus. HAMANN, C., 1, Konigsweg, Neubabelsberg, near Berlin, and DEUTSCHE TELEPHONWERKE UND KABELINDUSTRIE AKT.- GES., 6, Zeughofstrasse, Berlin. May 2, 1934, No. 13255. [Class 106 (i)] In a machine for the four rules separate mechanisms are provided for setting up the two factors in a multiplying operation, the multiplier is then transmitted in a single operation to a register in a laterally movable carriage and the setting is utilized to control automatically the transmission of the multiplicand set-up to a product register on the carriage in accordance with the denominational values of the multiplier. The machine as shown in Fig. 10 has two complete keyboards Tl, T2, for the multiplier and multiplicand respectively, a laterally movable carriage G with two registers or totalizing counters Z1, Z2, and a number of control keys and levers. Setting the factors. Depression of a key T1 displaces a differential slide 2a, Fig. 1, and through a system of linkages 2e, 2f and 2k sets a sector 1 so as to uncover a recess 4 in a stationary disc 3. Concentric with the discs, of which there is one for each denomination, is a shaft 7 and a series of wheels 6 loosely mounted on the shaft. Each wheel 6 is provided with internal ratchet teeth and with external teeth adapted to engage intermediate pinions 8 of the register mechanism Z1. The multiplicand setting mechanism is similar and the wheels 6a, Fig. 1a, which are loosely mounted on a shaft 42 coaxial with the shaft 7, are adapted to engage the pinions 8a of the product register Z2. Secured to the shafts 7 and 42 are pawls 5 with rollers 5b which on rotation of the shafts enter the recesses in the discs and rock the pawls into engagement with the internal teeth of the wheels 6, 6a so as to transmit the setting to the registers Z1 and Z2. Operating mechanism. The shafts 7 and 42 are driven by a motor 12, Fig. 2, having an axially displaceable rotor with a disconnectible clutch element 29 co-operating with a corresponding part of a belt pulley 29a and a coupling element 12c driving a shaft 12b provided with a worm 16a engaging a worm wheel 16. The worm wheel 16 is adapted to be coupled to a shaft 14a by a clutch element 14 releasable by the withdrawal of a holding lever 13 on depression of a key A1. On depressing the key A1 the motor circuit contacts 51 are closed and the motor starts ; the first action is to displace the rotor to free the belt pulley 29a and prevent its rotation by the resistance offered by the worm gearing, thereupon the worm gearing rotates the shaft 14a and a disc 17 thereon through a crank-pin 18 operates a pair of connecting links 15, 20 to displace a lever 21 and a rail 20b. To the rail 20b is attached a link 20c connected to an arm 26 of a toothed sector 26b engaging a pinion secured to the shaft 7 so that the rearward movement of the rail is transmitted to the shaft 7 and the multiplier is entered in the register Z1. At the end of a half revolution of the disc 17 a pin on the lever 13 enters a notch 17a of the disc to disconnect the clutch 14 and break the motor circuit. At the end of the backward movement of the arm 26 a bell-crank 10 is lowered to free the carriage G for movement to the right. Carriage shift mechanism. The carriage is driven by a spring drum 22i carrying a pinion 22g adapted to engage one or other rack element of a double rack 22c. The drum and pinion are mounted on a pivoted arm 22k having a pin 22m engaging a cam slot in a lever B settable in accordance with the nature of the computation to be performed. The rack is pivoted to a lever 22, one end of which is connected by a link 22b to the carriage G. The step movement of the carriage to the right is controlled by levers 86, Fig. 4, freely mounted on the numeral wheel spindle of the multiplier register and co-operating with a rail or arm 47 arranged beneath the base of the carriage. The carriage, in its extreme right-hand position, engages an arm A7 and pushes the key lever A1 to the right so as to complete the motor circuit thereby driving the shaft 14a causing it to raise the lever 21 and with it the lever 22, the upper end of which has been moved into engagement therewith during the displacement of the carriage. The lever thus restores the carriage to its normal left-hand position. Automatic multiplication operation. The shaft 42 of the multiplicand setting mechanism is rotated under the control of the multiplier set up on the register S1. For this purpose each of the wheels 8 has a cam 82, Fig. 4, with three surfaces adapted to coact with a corresponding bell-crank lever 81, 86 ; one surface corresponds to the digits 1 to 5, another surface 6 to 9 and the other surface 85 to the digit 0. The arm 86 can therefore take up one of three positions to control the step movements of the carriage to determine the direction of rotation of the product wheels 9a under the control of a reversing mechanism which enables the multiplication process to be effected by a contracted method. The reversing mechanism comprises a shaft 56a, Fig. 3, with a set of pairs of pinions 56, the left-hand wheel of each pair being directly geared with the wheels 6a. The carriage is adapted to be displaced so that the wheels 8a mesh directly with the wheels 6a or mesh with the right-hand pinion 56 to rotate in the opposite direction. The step movement of the carriage is arrested by the arm 86 engaging the end of a pivoted bar 47 or its adjustable tongue portion 47a, Figs. 7, 8 and 9. When the rail is displaced slightly by contact with an arm 86, the lever 38 attached is effective to displace a lever A5, Fig. 2, which closes the motor circuit and releases the setting mechanism S2. This movement of the carriage brings the first or unit wheel 8 of the multiplier register into alignment with an oscillating finger 90 or 91 for adding or subtracting the multiplicand according to the setting of the arm 86. The fingers 90, 91 are oscillated by an eccentric 23 secured to the shaft 42 ; these fingers are provided with slots in which engage pins 95, 96 on a semicircular lever 97 so as to cause the levers to oscillate in opposite directions. On each oscillation the numeral wheel 9 is returned or advanced one step to the zero position ; when the zero position is reached the arm 86 is freed and the carriage shifts to the next denomination. In this contracted method when the multiplicand is subtracted once or more times and the wheel is advanced to the zero position a transfer to the next higher denomination is effected to compensate the value. If a product is to be taken away from an amount standing in the register 22, the action of the parts is reversed by operating a lever U, Fig. 4, to rock the lever 97 to its reverse position and to displace a slide 47b to move the tongue 47a to the position shown in Fig. 8.