Patent GB-190426013-A (GB)
Title: Improvements in Calculating Machines.
Inventor: EDWARDS ARTHUR ERNEST
Filed: 1904-11-29
Granted: 1905-04-20
Abstract: 26,013. Edwards, A. E., [Saunders, H. B.]. Nov. 29. Calculating-apparatus.-A keyset multiplying- machine is shown in plan in Fig. 3, in horizontal sections in Figs. 4 and 6, and in transverse section in Fig. 9. The machine is adapted to make actual multiplications, and not repeated additions, the mutiplicand and the multiplier being set upon the banks 12 of depressible keys. Fractions can be set both in the multiplicand and in the multiplier. The multiplicand keys 13 control the shafts 47, 47<a>, 47<b>, 47<c>, and the rackbars 46, which have their teeth 51 in mesh with the gears 54 of the primary calculator discs 53, so that the movements determine the degree of rotation of the calculator discs. The discs 53 serve to regulate the movement of the finger-bars 68, and together with the check lever 79 serve to hold the rack-plates 73 normally out of the path of the counting-pinions 74. The multiplier keys 13<1> control the shafts 47<d>, 47<e>, 47<f>, and the rack-bars 45 which have at their rear ends the spurs 50. When the power lever 138 is actuated, the rack-bars 46 move forward and rotate the calculator discs 53, and the rack-bars 45 move into contact with the pins 52 and move forward, givitig the discs 53 an additional rotation. The four series of rack-bars 46 and the governing rack-bars 43, which control them, are acted upon by the master-bar 35 of the actuating-mechanism. The bars are brought back to normal position by the return movement of the trip bar 33. The primary calculator discs 53 are mounted in groups on composite hubs, and are constructed on a circle divided into nine sectors, each sector being subdivided into nine sub-sectors. The function of the spur 50, after the rack 51 has determined which of the sectors of a disc 53 is to be acted on by the finger-bar, is to determine which of the sub-sectors of that sector is to be brought into line with the finger 67 of the finger-bar 68. The fingerbars 68 are held normally from moving by the master-bar 70 and its control ling-mechanism. Each finger-bar 68 carries a rack-plate 73 to engage with the counting-pinions 74 of the calculator carriage 76, and each rack-plate has the function of nine racks side by side, each with one tooth more than the one adjoiuing. The travelling carriage 76 is made up of five sections arranged to add together all the rack-plate teeth set by the primary calculator discs. Each section consists of the pinions 74, the connected gears 89 and the clutch and disc carrying mechanism. For registering purposes, the carriage 76 is provided with graduated discs 94<a>, which are brought to rest in the paths of bent arms to limit their movements. The indicating rackbars 123 are geared to the registering-dials 135 as shown in Fig. 9. As the power lever 138 is operated, the segment 141 is moved in one direction, the teeth 169 of the segment 168<a> engage the pinion 171, and the carriage is moved from right to left, but, on the continued movement of the segment 168<a>, the teeth 170 of the segment act on the pinion 172 and the carriage movement is reversed. Instead of the spring movements in the machine, weight movements can be substituted, or positive movements may replace the spring movements..