Patent GB-852271-A (GB)
Abstract: 852,271. Mechanical calculating-apparatus. OLIVETTI & CIE SOC. PER AZIONI ING., C. April 8, 1959 [April 17, 1958], No. 11824/59. Class 106 (1). In a calculating-machine in which a plurality of denominational actuators are adapted to co-operate with a settable multi-denominational indexing mechanism, means for automatic multiplication by a singledigit multiplier are provided, both the multiplicand and the multiplier being set up by the main keyboard. As described, the invention is applied to a conventional ten-key keyboard machine comprising a pin carriage carrying setting pins adapted to co-operate with differential actuators. Setting multiplier digit.-The multiplicand is first set up in the pin carriage 7, Fig. 1, and the lowest order digit of the multiplier is entered immediately adjacent to the multiplicand. Depression of a multiplication key 65, Fig. 4, shifts a slide 62 and spring-attached lever 61 to the right, a hook 60 engaging a lug 59 to rock a lever 49 counterclockwise thereby disengaging a lug 57 thereon from a notch 55 in a disc 54. A slotted lug 48 also on the lever 49 is lowered to enable a pawl 47 to engage one of four pins 51 on a disc 52. Movement of the lever 61 causes its shoulder 68 to rock a lever 70 thereby starting an electric motor (not shown) to drive the main shaft 29 of the machine. A cam 46 attached to the shaft 29 consequently rotates a lever 44 to cause the pawl 47 to rotate the disc 52 and shaft 53 on which it is fixedly mounted through about 90 degrees clockwise, the disc 54 now locking the lever 49 in its rocked position. The rotation of the shaft 53 is communicated to a cam 73 which moves to allow a spring-urged lever 72 to rock, a lug 74 on the lever engaging behind a projection 75 on the slide 62 which is thereby locked, together with the depressed key 65. Another cam 77, Fig. 5, on the shaft 53 sets the repeat mechanism to prevent the pin carriage 7 from being restored at the end of the machine cycle and engages a back space pawl 90 with the teeth 91 of a spacing rack. A cam 96, Fig. 5, on the main shaft 29 now rocks a bail 94 to cause the back space pawl 90 to back space the pin carriage 7 by one space rightwards to bring the set stop pin 8 of the lowest denomination set up in the pin carriage, i.e. that corresponding to the multiplier digit into the vertical plane of a sensing finger 20, Fig. 1, on a cycle counter actuator 15. A further cam 102, Fig. 1, on the shaft 53 releases a lever 103 which is spring urged clockwise, a slide 18 moving to the left. Cams 28, on the main shaft cause a pinion 23 to engage a toothed edge 22 of the cycle counter actuator 15. The universal bar 11 of the machine. is now raised by the cycling mechanism to allow the cycle counter actuator to move upwards thereby rotating the pinion 23 by an amount corresponding to the multiplier digit. The raising of the bar 11 also allows actuators 9 to move upwards. The clockwise rotation of the pinion 23 releases a tooth 31, Fig. 4, from engagement with a lever 40 which is spring urged clockwise, the hooked arm 42 thereon latching the already rocked lever 44 to prevent the pawl 47 from being restored. The lever 44 cannot be rocked by the cam 46 until the pinion 23 is returned to its original position. When the universal bar 11 reaches its upper position, printing mechanism causes printing members to print the multiplicand, a multiplication sign and the multiplier digit. The cam 37, Fig. 1, is now effective to disengage the pinion 23 from the actuator 15. Upon restoration of the universal bar, the actuators 9 are effective to enter the multiplicand into the register 13. If the multiplier digit is zero, the slide 18 can move only partially leftwards, and the register 13 is maintained out of mesh with the actuators 9.. For a non-zero multiplier, on restoration of the actuator, a roller 16 thereon is effective to lower the slide 18, a lug 109 releasing a locking lever 106 to maintain the actuator 15 in its zero position throughout the subsequent machine cycles for the sensed multiplier digit. In the final portion of the first cycle the cam 96, Fig. 5, is effective to zeroize the multiplier digit stop pin by shifting the pin carriage 7 temporarily to the right in front of a zeroizing plate (Fig. 2, not shown). Multiplication operation.-At the beginning of each machine cycle, the cam 28 on the main shaft 29 is effective to cause the pinion 23 to roll clockwise along a rack 38 to an extent corresponding to a half-step of the pinion 23. During the upward movement of the universal bar 11, the cam 28 is effective to allow the pinion 23 to roll clockwise along the toothed edge 22 by another half-step. At the end of the last multiplication cycle for the sensed multiplier digit, the pinion 23 is restored to its home position, the pin 31 locking the lever 40, Fig. 4, counterclockwise causing the pawl 47 to rotate the disc 54 on the shaft 53 by a further 90 degrees. A cam 97, Fig. 1, is thus caused to rotate a lever 98 clockwise causing a push rod 100 to set up a zero stop pin 8<SP>1</SP> and a spacing stop pin 101 in the carriage denomination previously representing the first multiplier digit and to operate the carriage escapement mechanism to move the pin carriage one place to the right. The cam 102 on the shaft 53 restores the slide 18, and the cam 73, Fig. 4, effects release of levers 49 and 70. The next lowest multiplier digit may now be set up in the pin carriage 7, and the multiplication process again carried out. The product of the multiplication may be printed out in a conventional total-taking cycle (not described) clearing the register. A negative multiplication may be obtained by depressing a key 117, Fig. 4, instead of the key 65, the register 13 subtractively engaging the denominational actuators 9.