Patent GB-385630-A (GB)
Abstract: 385,630. Calculating-machines. SUNDSTRAND CORPORATION, Harrison Street, Rockford, Illinois, U.S.A. June 22, 1931, No. 18001. Convention date, March 3. [Class 106 (i).] A calculating-machine comprises a series of differential actuators, a setting carriage laterally movable from its normal position into the area of the actuators, and means for moving the setting carriage at right-angles to its lateral movement to control the operation of the actuators. The active setting elements on the setting carriage engage the differential actuators and move them into contact with combined driving and overthrow-preventing means. General operation. In the machine, which is of the ten-key type adapted for the four rules, the depression of a key sets an element in a setting carriage which moves stepwise in a cradle. When the main shaft is operated, the cradle containing the carriage is oscillated and the set elements operate the totalizer actuators. In subtraction, the setting carriage is given a half-step movement relative to the actuators to bring the set elements opposite other abutments on the actuators to cause a complementary amount to be transmitted to the totalizers. The totalizers are mounted on a laterally-movable carriage which also contains two sets of operation counters having the numerals on their wheels arranged in opposite directions. One operation counter only is provided with transfer mechanism. The main shaft is locked when an overdraft occurs, when the capacity of the machine is exceeded, and when an overdraft is changed to a positive balance, this locking mechanism being utilized in the performance of division. Key mechanism. The depression of a key 54, Fig. 3, causes its stem 55, Fig. 9, to rock a lever 61 the upturned end 68 of which lifts a lever 69 having a projection 72. The levers 61 are so pivoted that all the keys and all the levers 69 have equal strokes. Setting-mechanism. The projections 72 normally lie beneath one denomination of a series of setting elements 77, Fig. 5, arranged in a carriage, one of the setting elements being displaced upon the depression of a numeral key. The upper ends of the elements have numerals marked upon them viewable through an aperture in the casing. The carriage comprises end-plates 83, side members 86, 88, and upper and lower plates 92, 93. The side member 86 is formed as a tube surrounding a guide-rod 81 and a roller, (not shown) attached to the member 88 runs on a bar 80. The guiderod 81 and bar 80 are secured to endplates 79, Fig. 3, pivoted to the machine frame and forming an oscillatable cradle within which the setting carriage can slide. The lifting of any lever 69 rocks a lever 121 and depresses a link 129 a pin 131 on which rocks a lever 132 secured to a square shaft 133 pivoted in the endplates 79 of the cradle. The carriage is urged to slide by a spring and is normally prevented by the contact of a projection 119, Figs. 13 and 16, with one of a series of stops 116, which can slide in slots in the bar 80. A bail 136 slides along the square shaft 133 ; one arm of the bail engages a slot in the carriage and the other arm 140 contacts with the stops 116. The depression of a key thus causes the arm 140 to move the stop 116 out of the path of the projection 119 to allow the carriage to step one place towards the highest denomination. An erroneous setting is corrected by pushing inwards a key 146 which rocks a lever 153 clockwise and causes its end 156 to swing to the right a carriage-restoring lever 157, Fig. 31, pivoted at 158. A projection 160 on the lever 157 engages the carriage and moves it to the right, a fixed bar 169, Fig. 3, restoring the set elements 77 and a cam bar 165, Fig. 13, fixed to the carriage, resetting the stops 116. Actuating mechanism. The operating handle 203 is connected by bevel gearing to the main shaft 206 on which is a crank disc 209, Fig. 26, connected by a link 208 to the end 79 of the cradle. As the latter oscillates the ends of the projected elements 77 contact with and move arcuate actuators 175 rotatable about the same centre as the cradle. The actuators 175 carry totalizer-actuating racks. A shaft 307 journalled in the machine frame and driven from the cradle has pinions 306 which engage and drive racks 305 on the actuators when the latter have been moved one step by the elements 77. At the end of the clockwise movement the actuators 175 are aligned by a bar 302 moved to engage them by a cam 295 on the main shaft. A wing 215 attached to the setting carriage engages one of a series of fixed grooves 217 in a bar 216 as the cradle begins to move and so prevents the return of the carriage until the end of the oscillation. Restoring the setting carriage. To one pivot 82, Fig. 26, of the cradle is pivoted a lever 220 connected by a link 222 to a lever 223, Fig. 31, pivoted at 224 to the frame. A spring 225 connected at one end to a fixed stud 226 normally holds the lever 220 against the rod 81 of the cradle. The end 230 of the lever 223 is held by a spring lever 232, Fig. 32, to the left of a fixed rib 231, in which position it is out of the path of a projection 229 on the restoring lever 157. As the cradle and the lever 220 rock clockwise the end of the lever 223 travels up the left-hand side of the rib 231 but on the return movement of the cradle it is switched over to the right-hand side by a spring lever 235. The lever 223 is then in the path of the projection 229 on the lever 157, and is prevented from completing its downward movement since the projection 160 is held by the carriage which in turn is held by the wing 215. The spring 225 is thus tensioned, as is also a compensating spring 238 adapted to ensure the even return of the carriage and attached to the lever 220 and to the link 208. At the end of the cradle movement the wing 215 is released and the springs then restore the carriage. Ensuring the completion of the cycle. To ensure the complete restoring of the carriage before the main shaft is again operated a detent 242, Fig. 31, obstructs the lip 244 of a cam 245 on the main shaft unless the lever 223 has completed its stroke. To prevent the main shaft being given an initial movement in the wrong direction a lever 248, Fig. 26, engages a notch 251 in the disc 209. Subtracting by complementary addition. In subtraction, the true values are set on the keys and a subtraction lever 403, Fig. 3, is moved to rock a lever 406 anticlockwise about its pivot 407 to move a link 409, Fig. 54, and press a cam lever 412 into engagement with a conical cam 401. This cam is secured to the trunnion of the cradle and the latter is thus moved bodily to the left against the action of a restoring spring. The upper ends of the setting elements 77 are then displaced to clear the upper ends 194 of the actuators 175 but the lower ends of the elements are brought into the reach of studs 400 on the actuators. The lower ends of the elements are angle-shaped and each has a notch cut in one leg of the angle so that an element which is not set does not contact with a stud 400. The set element operates its actuator a distance proportional to the complement of its value with respect to 9 excepting in the units denomination, the actuator of which has its stud 400 advanced to the right to give a complement with respect to 10. The actuators to the left of the highest significant figure are rotated nine steps by the contact of the tails 111 of those stops 116 which have not been moved to allow the advance of the setting carriage with projections 419 on the actuators 175. The projection 419 on the units actuator is one step above that of the other actuators. Multiplying by repetition. The setting carriage restoring mechanism is disabled by a key 356 which, through a lever system 360, 364 inserts a blocking member beside the lever 223 when it reaches the top of its stroke and compels it to return on the left-hand side of the rib 231, Fig. 31, out of contact with the carriagerestoring lever 157. Overdraft-indicating mechanism. Exceeded capacity signal. The totalizer has more numeral wheels than there are transfer-operating cams 332, Fig. 5, on the main shaft. Each totalizer wheel has a tooth 345, Fig. 60, which, as the wheel passes through the zero position, depresses a cam lever 347 and a slide 349. Adjacent the slide 349 of the wheel of highest effective denomination in any particular carriage position is situated a link 448 which, upon the depression of the slide, rocks clockwise about its pivot 442 a latch 441 and allows a projection 443 on a locking lever 434 to escape past the shoulder 444 of the latch, whereupon the locking lever 434 is rotated anticlockwise by its spring 440 into the position shown in Fig. 60. The operation of the subtraction lever 406 moves upwards, Fig. 59, a rod 458 a notch in which engages and slides axially the locking lever 434. The end of this lever has stop arms 438, 439, the former 438 normally lying in the plane of but not within the orbit of a projection 428 on a disc 425 journalled on the main shaft 206. Integral with the disc 428 is a disc 426 having a projection 429. A pin 430 on the disc 425 projects through a slot in the highest transfer-operating cam 332, which is secured to the main shaft 206. A spring 432 normally holds the pin at one end of the slot. With 'the subtraction lever set, the stop arm 439 is moved from its normal position between the discs into the path of the projection 429 but is rocked as described above out of that path at each rotation of the main shaft so long as the highest numeral wheel continues to pass through its zero position. When this fails to happen, i.e. when an overdraft occurs, the lever 347 is not tripped and a succeeding rotation of the main shaft is prevented by the engagement of stop arm 439 and projection 429, the spring 432 being tensioned. The locking lever 434 and its associated parts 441, 448, 349, 347 are restored by a cam 478, Fig. 58, on a s