Patent GB-281715-A (GB)
Abstract: 281,715. Matticoli, A. Dec. 4, 1926, [Convention date]. Multiplying apparatus.-The entire multiplicand having been set up in the machine, a multiplier key may be depressed to effect the multiplication directly by the use of variable linkages and epicyclic gearing. The product having been transmitted to a laterallymovable totalizer the next muliplier key may be depressed to form the partial product to 'be transmitted similarly and so on. The principle on which the invention is based is illustrated in Fig. 2 wherein a graduated sector pivoted at O is angularly displaced by a link connection with a bar DE moved up or down in accordance with the value of the mutiplier. The links may be atttached to the sector at different points along its diameter so . as to effect variable amounts of rotation of the sector depending upon the value of the multiplicand. The numerals 6-9 are represented by their complements -4, - - -1, and the corresponding link connections are made on the right of the pivot O so as to cause rotations of the sector in a negative sense. Fig. 2 illustrates the result of multiplying 4 by 3, the bar DE having been raised through three units of displacement, and the indicator at C consequently showing 2 as the units figure of the product. If the multiplier exceeds 5 the bar is lowered instead of raised, the amount of its displacement being, of course, proportional to the complement of the multiplier. The tens figure of the product is arrived at by means of certain rules. Thus if the factors are both greater than 5 the tens figure equals (a-1) -(b-1) or (a-1)-(b-1) + 1 according as the zero at F fails to reach or reaches and passes the indicator at C, a representing the multiplicand and b the multiplier complement. In the practical embodiment of the invention the epicyclic mechanisms shown in Figs. 6 and 8 constitute the means whereby the units and tens figures of the product are obtained, and the machine is built up of as many pairs of such mechanisms as denominations to be included, except that one such mechanism (Ao) only is required in the units denomination (see Fig. 10). Referring to Fig. 6, the lever 14 pivoted at O<1> is the equivalent of the diameter AB in Fig. 2, and is geared at 13 with a sector 12 pivoted at 0. The outer teeth of this sector and the inner teeth of another sector 15 mesh with a planetary pinion 16 carried by an arm 11 which also carries another pinion 23 forming part of the tens mechanism (Fig. 8). The outer teeth of the sector 15 drive a numeral disc 31<1> indicating the units figure and the sector is provided with pins 29 located at points corresponding with the zeros of the scale shown in Fig. 2. The central pin is mounted to vield in one direction but the others are rigid. The tens mechanism, Fig. 8, comprises a lever 18 pivoted at O<11> and having points of application for links 24 as shown. The lever gears with a sector 17 pivoted at O and engaging a planetary pinion 22 mounted on a bell-crank 21 also pivoted at 0. The pinion meshes with a sector 19 gearing with the pinion 23, already referred to. which in turn engages a pivoted are 20 having pins to actuate a transfer pinion 28. The bellcrank 21 may be rocked by a link 25 pivoted to an arm 26 having limited motion on the bellcrank. To perform a multiplication the multiplicand is set up by suitable means so as to connect the levers 14, 18 with the multiplier parts through the corresponding links 32, 24. The key corresponding with the first multiplier digit is then depressed to raise or lower differentially the frame 33, 34 (equivalent to the bar DE. Fig. 2); if the digit is over 5 the link 25, Fig. 8, is also connected up. To perform the operation of multiplying 6 by 6 the links 32, 24 are as seen in Figs. 6 and 8 and, as 6 is greater than 5, link 25 is attached to frame 33. Key 6 now being depressed, frame 33 is lowered through four spaces, 4 being the complement of 6, and this effects also the lowering of frame 34 through one space. Due to link 32, Fig. 6, therefore, the sector 12 rotates counterclockwise and through the stationary pinion 16 rotates the sector 15 clockwise through a distance of 16 places so that numeral disc 31<1> shows 6. A pin 29 having thus passed, the pinion 28 displacesthe sector 20, Fig. 8, to the extent of one place and this movement is conveyed through planet pinion 23, lever 11 and pinion 16 to the numeral disc of the tens denomination. Lowering of frame 33 through four spaces, by means of link 25, rotates bell-crank 21 through three spaces, the lost motion of arm 26 taking up one space. Resulting from this the arm 11 is displaced negatively and conveys to the tens numeral disc a reverse rotation of three places. This disc having thus been turned one place forward and three back shows 8. However, lever 18 having been rotated through five angular spaces owing to the link 24 being connected at point 6, the planet pinion 23 causes arm 11 to turn and through pinion 16 rock sector 15 through five places to indicate 3 (that is, 8 less 5). Consequently the numeral discs of the first two denominations show 36. Specification 8912/86 is referred to.