Patent GB-431623-A (GB)
Abstract: 431,623. Calculating-apparatus. AKTIEBOLAGET FACIT, Atvidaberg, Sweden. Dec. 27, 1934, No. 37106. Convention date, Jan. 13. [Class 106 (i)] In machines for the four rules with a stationary totalizer, a stationary quotients counter, and a laterally movable main differential actuator means are provided to ensure the tabulation of the main actuator and of the operating member of the quotients counter to their correct denominational positions in division operations, independently of the number of denominations in the dividend and divisor. The main actuator may be of the Odhner type, the Thomas type, or may be a stop carriage such as described in Specification 368,311. The actuator 31 Fig. 1, is tabulated in a known manner by the depression of any one of the key levers 16, 19, 24. The key 16 sets the machine for division, the keys 19, 24 respectively advance and back space the actuator in a step by step manner. Each of these keys is associated with a full stroke spring controlled catch 32, Fig. 2. The quotients counter 1 is actuated by a tooth 3 axially displaceable on and rotatable with a shaft 4. The longitudinal movement of the tooth 3 is effected by a fork 6 secured to a carrier 8 slidable along and rotatable with a shaft 9. The shaft 9 is provided with a rack 13 with which co-operates an escapement tooth device with a fixed tooth 10 and a spring mounted tooth 11 mounted on the carrier. On the right hand end of the shaft 9 is secured an arm 14 with a pin 15 overlying the division key lever 16 ; on the left hand end an arm 17 with a pin 18 engages the upper edge of the tabulating key 19. The back space key 24 coacts with an elbow lever 21, 23, the end of the free arm acting as a pawl for co-operation with a rack 20 formed on the carrier 8. When the key 19 is depressed to tabulate the actuator it also raises the arm 17 and thereby rocks the shaft 9 to move the carrier and the actuating tooth member 3 one step to the left. Repeated depression of this key causes the actuator and carrier to tabulate until a projection 8<a> on the carrier overlies the arm 17 thereby locking the key against depression. Repeated depression of the back space key 24 restores the actuator and carrier to normal position in which position the carrier 8 is arrested by a pin 30 on the shaft 9 and prevents further movement to the right. By depression of the division key 16 the shaft 9 is rocked to disengage the escapement teeth entirely whereupon the spring 29 pulls the carrier to its extreme left hand position. At the same time the actuator by the known means is tabulated to its extreme left hand position. When the main actuator is cleared it returns to normal position and by engagement with the fork 6 restores the carrier 8 and actuating member 3 to initial position. In a modification shown in Fig. 4, the carrier 8 is mounted on a fixed shaft 9 and is provided with a rack 13a with which co-operates pawls 11<a>, 35. The pawl 11<a> is mounted on an arm 38 and is linked to the key lever 19 ; the pawl 35 is secured to the main actuator carriage 34 and engages a slotted rail 36 operatively connected to the division key 16 whereby it may be raised to free the pawls to permit the actuator and carrier to move to their left hand positions. British Specifications 351,276 and 413,205, and German Specification 535,576 also are referred to.