Patent GB-1211570-A (GB)
Title: Ten key calculating machine
Inventor: GASSINO TERESIO
IPC: G06C7/12
Filed: 1968-04-16
Abstract: 1,211,570. Calculating apparatus. ING. C. OLIVETTI & C., S.p.A. 16 April, 1968 [14 April, 1967], No. 17970/68. Heading G4B. A ten-key calculating machine comprises a pin carriage, a first mechanism adapted to transfer a quantity set up on the carriage to a calculating mechanism and return the carriage from its operative to its initial position, a clearing mechanism actuated cyclically to clear the carriage after it has been brought back to its initial position, and a repeat key for rendering the clearing mechanism inoperative and resetting the carriage to its operative position, whereby a quantity set up on the pin carriage may be retained during several multiplication cycles. General operation.-A number is set up on the pin-carriage by means of numeral keys, whereby the carriage moves one step to the left after each digit of the number is entered, and an indicator moves along a scale to indicate the number of orders set. A repeat key is depressed, and then a multiplier key, which initiates a cycle of a camshaft during which the number set on the carriage is set up on sliders. As the cycle ends the carriage moves rightwards to its initial position and then the repeat key, which is locked down during the cycle, is released. The repeat key is depressed, again disabling the clearing mechanism, but now the key descends further, causing the carriage to jump leftwards to its previous final position. The multiplier key is depressed, whereupon the repeat key returns to its inoperative position, reconnecting the clearing mechanism, and a multiplication cycle ensues, after which the carriage returns to the right and the clearing mechanism operates. For further multiplication of the number a different key is depressed instead of the multiplier key, whereby the previous product is transferred to the sliders, the multiplier key is actuated, and the repeat key is kept locked in its down position. The multiplier key is used again for the last multiplication. Pin carriage.-Each order of pins has a corresponding escapement stop 13, the highest order escapement stop being spring-loaded (Fig. 3), and the carriage being moved leftwards each time a numeral key is depressed through a universal bar 47 removing the aligned escapement stop from an escapement dog 14. A lug 17 of the carriage is engaged by a spring- loaded lever 18 which urges the carriage leftwards. A rack 52 on the carriage is engaged by a finger 51 on the universal bar. Repeating devices; key-detent.-On depressing the repeat key 56 a lug 68 rotates a lever 71 causing a lug 111 to disengage a latch 113 on a clearing-plate 121 from a lug 123 on a slider 122 reciprocated by a cyclically-operated cam 129. A projection 58 strikes a lug 61 to limit movement of the key which is retained by a shoulder 87 of a lever 84 pivoted at 72. On rotation of the main cam-shaft 22, a cam 131 causes a connecting rod 136 to move forward, rotating a crank 98 which moves a slider 138 rearwards to rotate a lever 84 and remove the shoulder 87 from lug 81. The key 56 still remains depressed as a spring-loaded lever 92 follows a projection 97 on crank 98 and places a lug 99 in the path of a shoulder 101 of the key shank 57. Towards the end of the cycle a cam 23 causes the lever 18 (Fig. 3) to rotate in a clockwise direction by means of levers 24 and 29, thus returning the carriage to its inoperative position. Immediately afterwards, a cam 129 (Fig. 1) causes the slider 122 to be moved forward. At the end of the cycle cam 131 acting through lever 132 and rod 136 rotates crank 98 clockwise, thereby rotating lever 92 to remove lug 99 from the shoulder 101, allowing key 56 to rise to its inoperative position. The lever 71 simultaneously rotates clockwise, re-engaging latch 113 with lug 123. With the carriage now in its initial position a pin 66 on a slide 34 holds the lug 61 away from projection 58 and key 56 can descend further than before. Depressing key 56 a second time rotates lever 71 as before to disengage the latch 113 from the lug 123, then the key continues, and its lug 68 acts on an arm 80 of a bail 74, rotating it about 63, thus shifting the universal bar 47 to the rear. Finger 49 of the universal bar 47 then depresses the first escapement stop 13 so that the carriage moves leftwards until the first unset stop 13 encounters the escapement dog 14 to reset the carriage in its operative position. The lever 18 is thereby rotated in an anti-clockwise direction whereby the pin 66 on slide 34 leaves the lever 62 which remains loeked by projection 58. The further descent of key 56 also rotates lever 92, locking it by means of a tooth 106 which engages a plate 104. When the key is released, the shank 57 is arrested by means of the lug 81 against the shoulder 87. Start keys.-A multiplier key (not shown) is depressed to initiate rotation of shaft 22, the cam 131 acting to advance rod 136, rotate crank 98, and disengage lever 84 from lug 81 by the motion of shoulder 139, thus releasing key 56. The lever 71 then turns clockwise, causing the latch 113 to re-engage the lug 123 (Fig. 1). The movement of the rod 136 also causes a latch 102 to rotate anticlockwise, unlocking lever 92, which rotates anticlockwise, bringing lug 99 against shoulder 101. At the end of the cycle, after the carriage has returned to the right, the cam 129 causes the plate 121 to clear the carriage. To initiate a multiplication cycle without clearing the carriage, a key 146 (Fig. 1) is depressed which carries the multiplication start key along with it in a known manner. By means of a pin-and-slot connection 142, 143, the key 146 rotates the'slider 138 to prevent the shoulder 139 from encountering the lug 141, so that key 56 is retained by shoulder 87 acting against lug 81 during a cycle, and the multiplier remains in the carriage. The last multiplication cycle is started by means of the normal multiplication start key. Item counter.-When a digit is entered on the pin-carriage the lever 18 rotates a step anticlockwise (Fig. 3), causing a similar rotation of the lever (29) (Fig. 4, not shown), which is connected by a pin-and-slot to a slider 34 having a projection 36 adapted to indicate on a scale 37 (Fig. 3) the number of orders set on the carriage.