Patent GB-927341-A (GB)
Abstract: 927,341. Calculating-machines. ADDO A.B. Nov. 6, 1961 [Nov. 7, 1960], No. 39650/61. Class 106 (1). In order to double a number each totalizer wheel is integral with a second wheel having half as many teeth. In a first machine operation the number is entered in the totalizers and in a second operation, requiring actuation of certain controls by the operator, the totalizers are read out to the differential actuators in the first half of a machine cycle, and in the second half of the cycle the actuators are engaged with the second wheels. The final setting of the totalizers represents double the number originally entered. Totalizers; transfer mechanism.-The totalizer wheels 8 and the integral second wheels 9 rotate freely on a shaft 7 carried in a cradle 6 rockable about shaft 4 (Figs. 10 and 16). A shaft 11 also spans the cradle 6 and carries pawls 12 each lying in the path of a double thickness tooth 10 on an associated wheel 8. The pawls 12 are so constrained by the frame of cradle 6 that on clockwise rotation of wheels 8 they act as stops for the teeth 10 and on anti-clockwise rotation of wheels 8 they transmit carries to the next order wheel. A second cradle 15 is rockable on shaft 4 and carries pawls 17 on shaft 16 and a rotatable shaft 20, crescent-shaped in cross-section. There is a pawl 17 for each totalizer wheel 8 and the underside of each pawl is adjacent a pin 14 on the pawl 12 of the next lower order totalizer wheel. When a number is to be entered in the totalizer, cradle 6 is rocked away from cradle 15 engaging the wheels 8 with previously set actuators 21 and disengaging pawls 17 from the wheels 8. At the same time shaft 20 is rotated so that the pawls 17 are free to move. During the entry such pawls 12 as are rocked clockwise by the passage of teeth 10 rock pawls 17 to an upper position where they are retained by ball catch 18. Cradle 6 is then rocked back to the position of Fig. 10 and the wheels 8 are re-engaged by pawls 17. Shaft 20 is rotated back to home position and those pawls which have been rocked to the upper position are returned, moving the associated totalizer wheels 8 one notch anticlockwise to effect the transfer. Operating the cradles 6, 15.-Pivoting on a shaft 22 extending outwardly of one side of cradle 15 is a U-member 23. The inner limb of member 23 ends in a cam surface 25 on which rides an extension of shaft 7. The outer limb of member 23 carries an outwardly projecting pin 24. The position of pin 24 thus determines the relative positions of cradles 6, 15. In the position shown in Fig. 9 the wheels 8 are in engagement with the actuators 21. Pivoting on a shaft 26 secured to the machine frame is a U-member 27 (Figs. 12, 16). The outer limb of member 27 is secured to a drive-rod 36 (Fig. 5) while the inner limb has a cam slot 28 embracing a pin 29 on cradle 15. A slot 32 embraces pin 33 on an arm 34 on crescent shaft 20 which is thus rotated with member 27. Drive-rod 36 is moved downwardly by a pin 39 on crank 40, in which position it is latched. At the end of a machine cycle as crank 40 reaches home position lever 44 releases rod 36. A key 49 when depressed allows a spring 55 to act to pivot the end of rod 36 out of the path of pin 39. When rod 36 is lowered, U-member 27 rides on a cam surface 30 and slides cradles 6 and 15 to the right as shown in Fig. 16, so that the wheels 9 are opposite the differential actuators. The action of member 27 is thus to move the totalizers so that the wheels 9 are in line with the actuators and by means of cam slot 28 to rock cradles 6 and 15 towards the actuators a distance sufficient that the action of U-member 23 will bring the smaller radius wheels 9 into engagement with the actuators. U-member 23 is actuated by either or both as required of two drivers 64, 65 (Fig. 1) engaging the pin 24 by means of recesses 66, 67. Driver 64 is reciprocated to the right in the first half of a machine cycle and driver 65 in the second half. Levers 70 (one shown) are operable so that pins 71 hold the respective drivers away from pin 24 during their reciprocation. The use of these levers is explained below. Sequence of operation.-To enter a number in the totalizer key 49 is depressed so that driver 36 is not actuated and consequently U-member 27 is not rocked. The levers 70 are moved anticlockwise of the position shown in Fig. 1 so that the driver 65 engages pin 24, while driver 64 is ineffective. In the first half of a machine cycle a number is set on the actuators 21 from the keys in known manner. In the second half driver 65 moves pin 24 to the right, rocking cradle 6 and thus the totalizer wheels into engagement with the actuators as they are reset. To double the number now in the totalizers the levers 70 are moved to the position of Fig. 1. In the first half cycle driver 64 moves cradle 6 so that the totalizer wheels engage the actuators 21 as they move downwardly in Fig. 10. The actuators are differentially arrested when the teeth 10 on the clockwise moving number wheels 8 contact the pawls 12, and the positions of the actuators then represent the number in the totalizer which has now been zeroized. Driver 36 is then actuated by pin 39 to rock U-member 27. This brings the wheels 9 in line with the actuators 21 and the slight rocking of frame 15 causes pin 24 to engage recess 67 and the wheels 9 to engage the actuators. In the second half-cycle the totalizer wheels are rotated through twice the angle in the opposite sense to that which they were rotated in the first half-cycle. Although the Figures show decimal totalizer wheels, they may represent mixed or other radices.