Patent GB-753067-A (GB)
Abstract: 753,067. Calculating-apparatus. AKTIEBOLAGET ATVIDABERG-FACIT. May 11, 1954 [May 11, 1953], No. 13766/54. Class 106 (1). In a machine having a rotatable differential actuator, e.g. the cam-disc and pin-wheel rotor 1, a product register 23 and a storing register 41 having no tens transfer mechanism, means are provided whereby, in a machine operation, (1) the product register is cleared into the actuator, (2) the storing register is cleared into the product register, (3) the value cleared into the actuator is added to or subtracted from that cleared into the product register and (4) the product register is cleared back into the storing register. In the type of machine concerned, the absence of tens transfer mechanism to the storing register necessitates clearing the storing register into the product register in order to accumulate products, the accumulated value then being cleared from the product register into the storing register. By the invention, a new product in the product register can be subtracted, if required, from the storing register using the normal subtract setting of the actuator. In the mechanism shown, transfer is effected by transfer teeth 11 of the actuator under control of intermediate wheels 25 permanently in mesh with the product register 23. The storing register 41 is carried between arms 46 rockable about a shaft 47 whereby it also can be engaged with the wheels 25. The product register 23 is cleared by one revolution counterclockwise of a shaft 37, wheels 38 on this shaft turning the product register wheels each to zero, in which position a short tooth clears the wheel 38. In the normal position of wheels 38, a broad tooth space gives clearance to the register wheels. Similar wheels 55, secured to the pivot shaft 47 of the carrier arms 46, are adapted to clear the storing register 41. In the above stated sequence of operations the mechanism functions as follows. (1) The actuator 1 is shifted axially, Fig. 12, to release the usual balllocking mechanism 14d for the toothed setting discs 13 and is next rotated clockwiseto abut the teeth of the discs against the wheels 25 now held by their back-stop pawls 28, this action resetting any set discs 13 as well as meshing the discs with the wheels. The shaft 37 is then given one revolution counterclockwise to clear the register 23, cam mechanism associated with the shaft rocking the pawls. 28 clear and the register setting being transferred to the actuator discs 13 which adjust the actuator pins 8 correspondingly. Finally, the actuator is shifted into its add or subtract position, as required, and returned counterclockwise to normal. (2) Cams 51 engage the steering register 41 with the wheels 25, alignment pawls 43 disengaging by abutment against a stop 54, and the shaft 47 given one revolution clockwise to clear the register into the product register. (3) The actuator is rotated once to re-enter the value registered by its pins additively or subtractively into the product register. Continued multiplication can be carried out by repeatedly rotating the actuator at this stage. (4) The cams 51 are again rocked to re-engage the storing register with the wheels 25 and the shaft 37 again rotated to clear the product register into the storing register. The several parts of the mechanism are operated in the abovedescribed sequence under the control of cams on a motor-driven shaft. Specification 724,043 is referred to.