Patent GB-566728-A (GB)
Abstract: 566,728. Calculating - apparatus. BROIDO, D. Oct. 21, 1942, No. 14762. [Class 106 (i)] A machine for calculations involving non-uniform numerical systems comprises a set-up mechanism for the non-uniform factor, a conversion mechanism to convert decimal multiples of the set-up unit values into equivalent values expressed in the final units, an intermediate register into which the converted values can be entered and stored, a main register, and transmission means for repeatedly entering the converted values into the main register according to the digit of the respective denomination of the second factor. The machine shown in Figs. 2, 2A, comprises a set-up and value-entering mechanism SU, a conversion or clutch mechanism C, an intermediate register IR, transmission mechanism T, a main register R, a revolutions register RC and operating mechanism, some of the parts being identical with those described in Specification 542,476. General arrangement. As explained with reference to Fig. 1, the set-up mechanism comprises elements L1-L10<4> for pounds, S1, S10 for shillings and D10<-2>-D10 for pence. In any axial position these elements are aligned with certain wheels of the intermediate register IR and also with gears and clutch actuators indicated respectively by plain arrow and dot- and-dash arrow lines. The gears have a 1 : 1 ratio with register wheels, while the clutches drive the corresponding register wheels a predetermined number of steps, as indicated by the numerals in the small rectangles. The arrangement is based on the conversion of the decimal multiples of a pound, a shilling and a penny. Set - up mechanism. The value - entering means as shown in Figs. 2, 3 and 3A comprises a known form of setting means with barrels 10, pinwheels 11 and cam discs 12, the barrels being rigidly mounted on an outer sleeve 400 slidable on an inner sleeve 402 loose on a stationary shaft 20. The barrel assembly is mounted in carriage plates 407 interconnected by a rack 408 and cover-plate 15. The means for shifting the carriage laterally comprises a pair of levers 409, 413 that co-operate with the rack 408. The lever 409 is formed with a handle and is pivoted to a bracket 411 which is itself pivoted for horizontal rocking movement. A guide pin 419 on the rear end of the lever 409 engages an oval groove in a fixed bracket 420. The bracket 411 is formed with a cam surface 417 engaging an extension 416 on the stop lever 413. To shift the carriage, the lever 409 is pushed horizontally in the desired direction to rock the bracket 411 and thereby disengage the stop lever from the rack. The guide pin 419 is caused to follow the oval groove and a projection on the lever 409 engages and moves the rack 408 and then returns the parts to initial position. Intermediate register. The register IR comprises driven gears on a shaft 423, idler gears on shaft 424, clutch gear on shaft 425, idler gears and rockers on shaft 426 and a carry-over device on shaft 427. The gearing includes single gears 429, 430, 432 and 438, double gears 428, 431, 436 and 439, and triple gears 437 and 440. The triple gear 437 has twelve teeth, all the other gears have ten teeth. The gears on shaft 425, Fig. 2A, have transfer teeth that co-operate with pivoted rockers 446 and spring- loaded pins 448 on carry discs 450 on the shaft 427 and operate to effect transfer in a known manner. For clearing this register, the shaft 424 is rotated and a comb bar 73 is shifted longitudinally to align its tines 72 with studs 442 on the idler gears and return the gears to zero position. Clutch mechanism. The clutch elements comprise a splined shaft 454, driven by a belt 457 from a motor (not shown), and gear sectors 458, each carrying a spring-controlled pawl 461, Figs. 2A, 3A and 5. Each sector has a predetermined number of teeth as indicated by the numerals below the sectors, Figs. 3 and 3A, and correspond with the conversion ratios shown in Fig. 1 in the small rectangles. The seventh clutch element from the right has a double gear sector 4581. The means for operating the clutches are arranged in two banks. Normally, the pawl 461 of each clutch is held in inoperative position by a rocker 464 (upper bank) or 465 (lower bank). The rockers 464 are controlled by the pence barrels 10 and each rocker 464 abuts against a corresponding spring-controlled bail 468 that is pivoted' on a shaft 469 and carries pivoted stop levers 473 normally engaging an elevation 460 on the respective gear sector 458. When a bail 468 is rocked by the co-operation of an associated rocker arm 477 with a set pin 11 of the barrel 10, the stop levers 473 release the gear sector 458 for frictional rotation with the shaft 454. At the same time the rocker 464 slides down the sloped edge of the bail 468 and frees the pawl 461 which under spring action couples the sector 454 positively to the shaft 454. The parts are restored during the cycle of operation by disengaging the pawl and the elevation 460 is trapped between the stop levers 473 in the neutral position. In certain positions, the rockers 477 are rigid with the bails 468, in other positions the rockers operate the bails through arms 479, 480, Figs. 5 and 6, while in other positions no rockers are provided, but the bail is formed with an arm 478 underlying the adjacent bail. In the upper bank the bails 468, with two exceptions, are so interconnected that when one is operated all bails to the right are also operated. The operation is repeated for each pin 11 projected. Considering the lower bank, Figs. 2, 2A and 6, each bail 468 has a tail 483 operatively connected with a tail 485 or 486 formed on its rocker 487. These rockers are controlled by the shillings and pounds barrels 10 and co-operate with the bails 468 to operate the appropriate clutches. Main register. This register is similar to that described in Specification 542,476, with register wheels 65 rotatable on a shaft 66 and having a conventional form of transfer mechanism and zeroizing means. Transmission mechanism. When the intermediate register is zeroized its contents are transmitted to pin barrels 495 on a shaft 496 which is rotated to activate the main register wheals 65 through idler gears 491. The pins 501 of each barrel, Figs. 2, 4A and 7, are mounted on a wire to swing in axial planes and are moved from an inoperative position to an active position by a cam groove 504 in the hub of a gear 503 rotatably mounted on its barrel. Additional pins 505 are provided for effecting transfer in the main register. The barrels 495 are cleared by means of lugs 510 thereon co-operating with a slidable bar 511 on pivoted brackets 513. Revolutions counter. The revolutions of the shaft 496 are transmitted by a sprocket gearing to a shaft 518, Fig. 2, that carries a single-toothed member 517 to drive a conventional revolution counter RC. The member 517 is slidable along its shaft with the carriage of the setting mechanism. Driving and operating means. A motor drives the clutch shaft 454 which through gearing drives the transfer shaft 427 and a gear 527, Fig. 4, fast to a sleeve 528 rotatable on a camshaft 529. The sleeve is coupled to the shaft by a one-revolution clutch 297, Figs. 4 and 8, comprising a spring-loaded plunger 298 coacting with a dog 300 on the gear 527. The plunger has a roller 302 normally engaging a stop lever 540 and locating fingers 304, 305. The lever 540 is rocked to release the roller 302 by depression of a hand lever 564. After adjustment of the set-up pins 11 and the shifting of the carriage, the hand lever is depressed to initiate the rotation of the clutch 297 and cam-shaft 529. A sector gear 537 on. the cam operates through gearing to drive the pin barrels 10. The set pins co-operate with the rockers 477 or 487 to couple up the clutches and enter the conversion amount into the intermediate register a number of times depending on the number of pins set. In the meantime, the transmission barrels 495 are restored after the previous operation by the clearing bar 511 which is operated by cams 534, 532 on the shaft 529. When the entry in the intermediate register is completed, the transmission barrels 495 are lowered by cams 531 into mesh with the gears 430, 436 and 439 of the intermediate register, whereupon sector gear 5311 rotates the gear 441 and shaft 424 to zeroize the intermediate register and transmit the setting to the pins 501 of the barrels 495 which are then raised out of engagement. At the completion of one revolution of the clutch 297 a second one-revolution clutch 297', similar to clutch 297, operates to drive the transmission barrels 495 and enter the amount into the main register. Each revolution of the barrels 495 is entered in the revolutions counter RC, the hand lever 564 being held depressed for a time depending on the digit value in the appropriate denomination of the multiplier factor. One element of the clutch. 297<1> is mounted on a shaft 550, Fig. 4, which can be rotated in one direction, for addition and multiplication, and in the other direction for subtraction and division, by a reversing clutch 559 on the sleeve 528 operated by an extension on a clutch fork 560. Specification 545,617 also is referred to.