Patent GB-190209892-A (GB)
Title: Improvements in or connected with Adding Devices for Typewriting and similar Machines.
Inventor: LORRAIN JAMES GRIEVE
Filed: 1902-04-29
Granted: 1903-04-29
Abstract: 9892. Lorrain, J. G., [Wolfe, J. C., and Morton, E. W.]. April 29. Calculating-apparatus.-Relates to adding devices for the summation of columns of figures written by means of type-writers, the devices being so related to the keyboard and to the carriage of the machine that as the writing of the column proceeds, the total is continuously indicated by the index wheels of the adding apparatus. The devices are also adapted to permit of pointing off or spacing the various numerical orders of the numbers written without interfering with the operation of the adding apparatus. Fig. 1 shows the apparatus in plan view. Nine levers A pivoted on a common fulcrum rod 13 are provided at their rear ends with antifriction wheels 20, which underlie the numeral keys of the type-writer to which the adding attachment is fitted. A toothed wheel B is splined to a shaft 44, and travels step-by-step along the shaft, being coupled for that purpose with a carriage B<1> which is connected by cords 51, 51<a> and differential pulley 52 with the paper carriage of the machine. A spring drum 49 pulls the carriage B<1> towards the left, in opposition to the pull of the paper carriage. The shaft 44 is adapted to turn the wheel B through one, two, or more teeth according to which of the levers A is depressed. When the paper carriage has moved far enough toward the left for the commencement of the column of figures, the wheel B, moving towards the right, has come into engagement with the first of the recording or index wheels C, and the carriage scale indicates the denomination of the number to be written at that point. As the writing proceeds, the wheel B passes from one to another of the index wheels C, each of which is turned through the same number of teeth as that printed by the machine at the corresponding point. Uarrying- wheels transfer the tens from each index wheel to that of next higher denomination, and the summation of the columns thus proceeds simultaneously with the writing. The device for enabling the numbers to be pointed off (thus :- 45,477.84), is shown in Fig. 16. If the paper carriage were connected directly with the cord 51<a> which effects the traversing of the wheel B, the printing of one of the dividing points would carry the wheel B past one of the index wheels C, and the next rotation of the wheel B would be transmitted to an index wheel of the wrong denomination. To prevent this the cord is attached to a short rack 171 guided in a bracket 170 fixed to the paper carriage. The bracket carries a pinion 182 gearing with a fixed rack 184, and as the carriage advances, the disc 178 of a Geneva movement 178, 175 is rotated so that at each fourth step of the carriage the toothed wheel 175 and pinion 173 are moved on one step, and the rack 171 draws back the cord 51<a> by an amount which just cancels the amount due to the movement of the papercarriage and leaves the carriage B<1> and toothed driving-wheel B undisturbed. Details of the adding-machine are shown in Fig. 3, 4, and 8. The depression of the rear ends of the levers A, Figs. 1 and 3, causes the front ends to rise up between pivoted check plates 17 which have only sufficient aggregate space between them to allow one lever A to rise at a time. A link 29 is drawn upwards when a key lever is depressed, and a bolt 22 is shot into the opening between the plates 10, 31. These bolts serve to arrest at varying heights the arm D, Fig. 8, of a toothed sector 42, which is actuated by means of an electromagnet 34. When a numeral key lever is depressed, a universal bar 55, Fig. 1, is depressed with it, and the shaft 57 is rocked. The movement is transmitted to a rock-shaft 36, Figs. 1 and 8, and the arm 37 is thrown forward so as to bring the sector 42 into engagement with a pinion 43 at the left-hand end of the shaft 44 on which the driving-wheel B is splined. Immediately afterwards electrical contact devices moving with the universal bar 55 close the circuit of the electromagnet 34, and the pinion 43 is rotated by an amount depending on which bolt 22 has been projected into the path of the arm D. Fig. 4 shows one of the index wheels C in engagement with the driving-wheel B. When the universal bar 55, already referred to, is depressed, a link 61 is thrown forward, and the bell-crank lever 65 is rocked so as to lift an aligning bar 64 from the wheels C. The carrying-wheels C' have teeth 104 in their own plane to engage with one wheel C, and outwardly-bent teeth 105 which engage with the wheel C of the next higher denomination. The outer ends of the teeth 104 are concaved so as to constitute with the flange 94 and its single tooth 95 a Geneva movement, which locks the carrying-wheel except at that moment in each revolution of the wheel C when the tooth 95 engages with the teeth 104. The teeth 105 are in engagement with the recesses c' in the next index wheel, and transfer the tens to that wheel. It is necessary that the wheel C, which is about to be rotated, be disengaged from the carrying-wheel which connects it with the index wheel of next lower denomination, and for this purpose cams 115 are rocked in turn as the carriage B<1> moves along the shaft 47, so as to allow the pivoted levers 101 to drop and disengage the carrying-wheels C' temporarily from the wheels C. A stop device is provided for preventing the wheel to which the tens are being carried from moving more than one step at a time. All the wheels C' can be simultaneously disengaged from the wheels C, which can then be set to zero by turning the shaft 97, on which they are loosely mounted. Each wheel is brought to zero by the engagement of the tooth 95 with a pin 152 temporarily projected into its path. A tapered aligning bar 85 co-operates with the aligning bar 64, and receives its movement from an electromagnet 35, Fig. 1, the circuit of which is closed by the movements of the universal bar.