Patent GB-1139928-A (GB)
Abstract: 1,139,928. Mechanical calculators. ING. C. OLIVETTI & C., S.p.A. 6 April, 1966 [10 April, 1965; 11 Feb., 1966], No. 15227/66. Heading G4B. In a calculating machine adapted for multiplication and division and the printing of the results of such operations, such as the machines described in Specifications 1,139,927 and 1,139,929, as well as storage registers 17, 22 (Fig. 7) engageable with actuator racks 15 there is a further register 135 having more denominations than the number of racks 15, the exceeding denominations being brought into engagement with the racks under the control of a manually settable knob 239 (Fig. 5). An additional printing member is differentially set to print a figure corresponding to the number of the exceeding denominations of register 135 (Fig. 7). Multiplication.-If the product is required to have a predetermined number of denominations to the right of the decimal point cut off this number is set up on knob 239 (Fig. 5) so that a slide 206 is displaced two steps. The register 135 is not displaced since lug 201 is arrested by stepped edge 202 (Fig. 4). After setting up the multiplicand and multiplier, cam 226 on a program control shaft 51 positions a link 222 in its central position. During the cycle of shaft 30 (Fig. 6) which proceeds the counting cycles of the main shaft lever 89<SP>1</SP> rocks the lever 222 so that a lug 243 engages the shaft 206 to prevent accidental rotation of knob 239. Lug. 201 (Fig. 4) is moved out of engagement with plate 203 so that it is rotated through two steps until it is arrested by slide 206 to displace slide 159 (Fig. 7) two steps leftwards. During the first part of the cycle of shaft 31 (Fig. 6) when the slide 159 (Fig. 7) is lowered, a lug 158 engages the second step of slides 152, 153 to rotate the shaft 158 and hence via roller 144 move register 135 two steps leftwards so that the first two cut off denominations 136 are in correspondence with racks 15. The two lowest orders of the product are then accumulated therein. At the end of the counting cycles of multiplication the program shaft 51 is displaced to control printing so that link 222 (Fig. 5) is moved downwards and hence via lever 218 and shaft 217 a lug 262<SP>1</SP> (Fig. 4) is moved into the path of lug 261. Lug 201 is also moved out of engagement with shaft 206 so that the register 135 is returned to its right-hand position. During the subsequent cycle of shaft 32 in which the multiplier is printed a lug 251 senses the stepped edge of slide 206 (Figs. 4) to cause the rack 258 to position typewheel 259 for printing the number 2. The cut off denominations are then zeroized and when shaft 30 next cycles the product is printed and figure 2 is printed to the left of the product. Extended multiplication.-The register 135 may be used for extended multiplication in which denominations of the products exceeding the capacitor of the racks 15 are automatically accumulated in the register 135. The typewheel will print a figure equal to the number of cut off denominations and in a modification it may have a character "> 5" to indicate that more than 5 denominations have been cut off. Division,-If for example 3 denominations are required to the right of the decimal point knob 239 is rotated three steps to move the slide 206 rearwards to rotate drum 300 clockwise. When the carriage 22 has been stepped to its right-hand position the register 135 is moved leftwards through three steps to acumulate three more denominations of the quotient. Percentage calculating.-Under the control of the program shaft 51 when a key 384 (Fig. 5) is pressed the slide 206 is displaced rearwards through four steps. Then as a percentage increase or discount is to be calculated the rate (which is given with two denominations at the right of the decimal point) is set up as a multiplier and the slide 206 controls the cutting off of four denominations.