Patent GB-517008-A (GB)
Abstract: 517,008. Calculating-apparatus. CHICK, T. W. June 10, 1938, No. 35410. Divided out of 502,958. [Class 106 (i)]  In a machine of the kind arranged to effect division by the method described in Specification 502,958, means are provided to evaluate expres- A sions of the form - x C, the product being obtained B concurrently with the calculation of the quotient. The method consists in calculating in the machine a multiple of the multiplicand corresponding to each multiple of the divisor, selecting, for each multiple of the divisor selected, the corresponding multiple of the multiplicand, and summing the selected multiples of the multiplicand each multiplied by an appropriate power of ten. The machine comprises a plurality of totalizers, means for entering the factors, means for calculating and registering predetermined multiples of the divisor and corresponding multiples of the multiplicand, means for comparing the multiples of the divisor concurrently with the highest figures of the dividend and selecting the largest multiple that is not greater than the dividend and at the same time selecting the corresponding multiple of the multiplicand, means for obtaining, and setting as the dividend for a further comparison, the difference between the dividend and the selected multiple, and means for summing the selected multiples of the multiplicand during a succession of comparisons. The machine also includes adjustable means for splitting the totalizers, column shift mechanism for correlating the highest significant figure of the dividend and divisor, and canvassing means for isolating the selected multiples.  Keyboard and differential mechanism. - The keys 50, Figs. 2 and 3, are arranged in columns and each key is provided with teeth 52 meshing with a sector 53 secured to a bail 54. Each bail co-operates with a plurality of locking slides 55, there being a separate slide for each key in each column. When a key is depressed the bail is rocked and a slide 55 is displaced to the left and held by a pawl 64. The slide associated with the zero key is not held and thus acts as a clearing means. Each key, except the zero key, is provided with two lugs 67, 68 that co-operate with pins 69, 73 on levers 70 that are pivoted on a slide 72, the slide having teeth 89 meshing with a segment gear 88 on a shaft 87. When the shaft 87 is operated the slide 72 is moved to the right and one or other of the lugs 67, 68 will act as a fulcrum for the levers 70. If no key is depressed the levers 70 rock idly but when a key is depressed the pin 69 on the corresponding lever 70, by engagement with a slot in the end of a lever 74 pivoted at its lower end 75, rocks the lever 74 and displaces a yoke 78, pivoted at the centre part of the lever, so as to engage the part 80 of a clutch with its co-operating part on a gear wheel 82. The wheels 82 are loose on a shaft 81 and differential movement is imparted to the shaft by a set of racks 83 one rack for each digital value. The racks 83 are operatively connected to separate vertical racks 86, Figs. 18b and 18c, that are reciprocated by engagement with a bar 47 oscillated by means connected to one of the driving shafts 520. Each shaft 81 carries a gear wheel 90, Fig. 4, that meshes with a gear wheel 91 rotatably mounted on a related totalizer drive shaft 92. The wheels 91 are coupled to their shafts by clutch elements 93, 94 adapted to be operated by arms 95 on a shaft 96. Totalizing-counters.-The machine is provided with seven totalizers Q and 0x to 5x of substantially the same construction Q being shown in Fig. 4 and 4x and 5x in Fig. 7. The drive shaft 92 carries seven bevel wheels 97 that gear with pairs of bevel wheels 98, 99, Fig. 12 Each pair of bevel wheels, drives clutch parts 103,106 loose on a shaft 102 and one or other part can be coupled to corresponding clutch parts on a gear wheel 107 axially,movable and rotatable about the shaft 102. The wheel 107 is thereby rotatable in one or other direction and transmits its movement through intermediate wheels 111, 113, 115, to a numeral drum 118 rotatable on a sleeve 119. Transfer mechanism.-Each wheel 111, Figs. 11 and 16, meshes with a wheel 121 integral with a transfer wheel 122 and transfer tooth 123. At transfer the tooth 123 engages and rocks a single toothed wheel 125 in one or other direction. The wheel 125 is integral with gear sectors 126, 127 in the next higher denomination and, when rocked, the sector 127 displaces a lock bar 128, Fig. 7, so as to place one or other of the projections 135, 136 into blocking engagement with a roller on levers 130, 129, pivoted to transfer actuating bars 134, 133. During a machine operation the bars 133, 134 are moved to the left Fig. 7 and one or other of the toe members of the levers 129, 130 is effective to turn the transfer wheel 122 and thereby the wheel 111 of next higher denomination. There is one pair of denominational bars for all the totalizers and the pair are operated in succession. After the transfer operations have been effected a set of bars 13.7 is operated to move the transfer wheel assembly axially to inoperative position, the actuating bars 133, 134 are restored and centralising bars' 138, 139, Fig. 4, are moved to the right whereupon projections 141, 140 thereon engage the. gear sectors 126 to restore the associated wheel 125 and lock bars 128 to normal. The bars 137 are displaced by gears 695 on a shaft 696, Figs. 19b and 19c, operatively connected by an arm 697 and rack link 698 to an operating shaft 520. The bars 133, 134 are operated by interconnected gears 366, 367 and associated racks 369, 370 co-operating with rocker arms 711 and complementary cams 713 driven from the main shaft 540. The rockers can be moved axially to co-operate with a second set of cams to alter the timing of the transfer operations. The ceritralising bars 138, 139 are operated by similar means (not shown).  Splitting the totalizers.-The machine is arranged to perform division in the upper denominations and multiplications in the lower denominations by a split' between any two  denominations. For this purpose a manually operated shaft 160, Fig. 4, carries pairs of complementary cams 161, 162, helically, disposed and co-operating with bell crank levers 163, carrying indicators 164 visible at a window 165. Each bell crank is formed with a sector 166, meshing with teeth on a slide 168. All slides 168 beyond the point of split will be in their left hand position and those below will be moved to the right. The slides 168, Fig. 8 'have T-shaped, ends connected by a T-shaped lever 372 to a bell crank 377 engaging a shaft on a slide 380. This shaft carries a gear 381 that is held in the disengaged position at the point of split to render the transfer bars inoperative.. Each slide serves to hold a set of sleeves 169 in one or other of two positions each sleeve carrying a gear sector 170 as well as a gear sector 173 that co-operate with a rack 171 or 172 and a rack 174, each rack 174 'being associated with a yoke 175 to effect the adjustment of the totalizer wheel 107 to a neutral adding or subtracting position. The racks 171, 172, which are operated as hereinafter described, are common to all the wheels 107 in a totalizer but each wheel has a separate rack 174 and yoke 175. Each slide 168 is connected by a lever 176, Fig. 8 to a bar 179 provided with projections 180 and recesses 181, Fig. 11, that co-operate with a pin 182 or pin 183 on a lever 184 mounted on an eccentric 185 secured to a shaft 114. The pins 182, 183 support yokes 186, 187 that carry pinions 194 adapted when the lever 184 is rocked, in one direction, to engage a pair of pinions 192, 193 on a shaft 190, or in the other direction, a similar pair of pinions on a shaft 191. Zeroizing mechanism.-The selection of the totalizers for resetting is effected by means of the shafts 114 each of which carries a gear wheel 661, Figs. 19b and 19c, meshing with a rack 662 operatively connected to a corresponding driving shaft 520. The operation is effected by rotating the shafts 190 or 191 ; the shafts 190 carry gears 655 that mesh with a common rack 656 driven by a gear wheel 659 on a shaft 660 connected to a driving shaft 520, while the shafts 191 are driven in a similar manner from another shaft 520. Prior to the rotation of the shafts 190, 191 the sleeves 197, Fig. 12, carrying the numeral drums 118 are moved axially to effect the engagement of a gear wheel 196, on the sleeves with a pin 195 on the numeral wheels 118. The axial movement is effected by displacing. the' shafts 120 by means of arms 664 on a shaft 665 operatively connected through a link 667 to a driving shaft 520. In the displaced position the gears 196 mesh with the gears 193 that are loose on the shafts 190, 191, but are rotated with the shafts through the gears 192, 194, the gears 192 being fixed on the shafts. Control and driving mechanism.-The various driving shafts 520 are selectively coupled to main driving racks 532. Fig. 28, by means of pinions 541 associated with control plates and operation control keys in a manner similar to that described in Specification 502,958. The clutches that connect the differential mechanism, the totalizers, and mechanisms to be described are also operatively connected to individual driving shafts 520. Entering the factors and multiples of the divisor and multiplicand. - The dividend is set up on the keyboard to the left of the split, a dividend control key is depressed and the machine operated through a cycle to enter the amount in the totalizer Ox The multiplicand and divisor are then set up to the right and left' of the split, a multiple control key is depressed and the machine operated through five cycles. At the end of these cycles the totalizers 1x to 5x contain, the multiples one to five times, the divisor being entered subtractively to set up the complement. The five cycles is ensured by a cam 402, Fig. 32, driven by a shaft 520 co-opera