Patent GB-1300761-A (GB)
Title: Improvements relating to calculating machines and number transfer devices therefor
Inventor: GIOLITTI NICOLO
IPC: G06C7/12
Filed: 1970-02-19
Abstract: 1300761 Calculating machines ING C OLIVETTI & C SpA 19 Feb 1970 [20 Feb 1969] 7968/70 Headings G4B and G4D In a calculating machine, a digit represented by a set one of sliders 144, Fig. 2, is entered into an order of an accumulator 194 by moving a slider 195, corresponding to that order, to a datum position, such movement (which is related to the digit originally represented by slider 195) also being imparted as an axial shift to a drum 165, formed with superficial projections, rotating the drum so that the set slider 144 co-operates with the projections to further axially shift the drum and thus the slider 195, the adjusted position of the latter then representing the accumulated sum in that order. Setting a number.-Depressing any one of nine keys 23, Fig. 5, corresponding to digits 1-9 shifts a corresponding slider 44 to the right to engage projection 56 with a drum 57. The "zero " slider is shiftable through rod 51. The surface of drum 57, shown as a developed view in Fig. 12, is formed with inclined raised portions 62-65, 69 and 73 which, on rotating the drum, co-operate with the projection 56 of the set slider to shift the drum axially either upwardly or downwardly through a distance depending upon the digit set. An escapement mechanism, Fig. 6 (not shown), permits 180 degrees of rotation of drum 57 each time a digit is keyed in. Consequently, duplicate inclined raised portions 62<SP>1</SP>-65<SP>1</SP>, 69<SP>1</SP> and 73<SP>1</SP> are provided on the drum. After the differential setting of the drum, a zeroizing tongue 76 returns it, during which return motion, ribs 78 on the drum co-operate with a toothed slider 81, Fig. 2, to shift the latter correspondingly. Eight such sliders 81 are located in eight circumferentially spaced slots 82 formed in a drum 83. Gearing 107, 108 rotates drum 83 through 45 degrees for each 180 degrees of rotation of drum 57. After the entry of each digit, the drum 83 is rotated through successive 45 degrees steps until the complete number is entered order by order. A lip 93 of a plate 77, Fig. 5, locks all the sliders 81 except the one being shifted, which extends through a gap 94. Addition.-Depressing add key 26, Fig. 7, pivots a universal bar 115 anticlockwise to free ten sliders 216 for movement to the right. Each slider represents a certain digit and is formed with a tooth 215 co-operating with a tooth 214 on a bar 150 representing the same digit. The freeing of sliders 216 and thus bars 150 frees ten sliders 114, Fig. 8, and ten sliders 155, Fig. 9, for movement to the right. A tooth 220, Fig. 2, on the first order slider 81 (already set to represent a certain digit) will prevent movement to the right of the corresponding slider 216. The corresponding bar 150 will prevent such movement of the corresponding slider 144 and 155. A lever 160, Fig. 9, is now operated to lock nine of the sliders in their inoperative a position (shifted to the right) and to lock the other slider in the set position shown. A shaft 61 (Fig. 2) is now rotated to axially shift a slider 195 through the interaction of a tooth 205 on the slider and edges 208, 209 on a drum 207, Fig. 12. The slider is one of eight mounted in an accumulator drum 197. The shift of the slider 195, which depends upon its initial position (i.e. the digit stored in that accumulator order), is imparted to a drum 165 through tooth 198. Drum 165 is then further shifted by a distance depending upon which slider 144 has been set (i.e. has not been shifted to the right). A projection 192, Fig. 8, on the set slider 144, engages one of inclined edges 182, 183, 187, 188 on drum 165 (Fig. 12) to effect this second shift on further rotation of the drum. The second shift is imparted to slider 195 through tooth 198 and the arrangement of the inclined edges on drum 165 is such that the position of slider 195 now corresponds to the sum in that accumulator order. Drum 165 now disengages from tooth 198 and is reset by interengagement of a tooth 168 with shaped block 170. After adding to each order, a shaft 91 is rotated to bring the next order slider 195 adjacent drums 165, 207. A gear train, Fig. 11 (not shown), from an electric motor (not shown) ensures that shafts 61 and 91 are rotated through appropriate angles at appropriate times and stops the cycle after eight revolutions of shaft 61, at which time shaft 91 has completed one revolution. Carry mechanism.-If the sum of the number held by an accumulator slider 195 and the number corresponding to the set slider 144 is greater than "9", then the arrangement of the inclined edges on drum 165 is such that (a) the adjusted position of slider 195 represents the unit digit of the sum and (b) the movement upwardly of drum 165 exceeds its movement downwardly so that its resetting tooth 168 engages slot 174, Fig. 12, of block 170 (rather than slot 173) to prepare for a carry when adding into the next highest order. Subtraction is similar to addition except that depressing the subtraction key axially shifts all the bars 150 so that they engage with the sliders 144 through teeth representing the nines complements of the respective digits which the originally engaged teeth represented. The nines complement is added to the slider 195 and drum 165 is conditioned for effecting a carry into each next highest order. If subtraction is the last operation before totalling or subtotalling, then the normal carry from the highest order into the lowest order is effected in a first idling part of the totalling cycle. Sub-totalling and totalling.-Depressing subtotalling key 28, Fig. 4, engages pin and slot 261, 262 to move a slide 251 to the left. This allows a bar 244 engaging all the bars 150 (see also Fig. 2) to move and shift bars 150 so that they engage with ten sliders 254 and disengage from sliders 216. After the idling cycle (referred to above) the digit stored in each accumulator slider 195 is transferred to drum 165, which is then restored by a tooth 269, Fig. 8, equivalent to zero, so that slider 195 retains its originally held position. Depressing total key 29, Fig. 4, moves slider 251 further to the left so that bars 150 are shifted by a greater amount so that the "nines-complement" teeth on sliders 144 are engaged. This results in such restoring of drum 165 as to zeroize the accumulator sliders 195. Printing.-In adding or subtracting, a set slider 155, Fig. 9, through its projection 276 axially shifts a drum 277 which through a toothed portion 291, Fig. 4, and pinion 292 sets indicia on a drum 294 for printing. In subtotalling or totalling, the corresponding slider 155 is set via tooth 257, Fig. 2, on slider 195, slider 254 and bar 150.