Patent GB-720088-A (GB)
Abstract: 720,088. Calculating-apparatus. BELL PUNCH CO., Ltd. Aug. 23, 1951 [Jan. 30, 1951], No. 2372/51. Class 106 (1). A full keyboard, key-operated or keyresponsive calculating-machine has primary and secondary registers in front and to the rear of the keyboard respectively and mechanism normally disengaged from both registers for transferring a total from the primary register to the secondary register. In a key-responsive (power-driven) machine, each pinion 5 of the primary totalizer is geared to a pinion 9 fast with two stop-plates of stepped snail shape. The steps are formed at radial distances corresponding with the digit registered on the plate 11 and with the nines complement on the plate 12. Normally, fingers 15 of stirrups pivoted on a rod 16 are aligned with the plates 11 and when these are released by control mechanism to be described they engage the plates and through links 18 differentially set toothed segments 19 which are positively restored while in engagement with pinions 10 geared to secondary totalizer pinions 2. To effect a subtractive transmission, the stirrups 15 are moved axially along the rod 16 into alignment with the complementary plates 12. The lowest order finger 15 has a partly cut-away tip so that when engaging its plate 12, an extra one is added to convert the nines complement to the true complement. Transmission and zeroizing operations are controlled by two levers 35, 36, Fig. 3, each of which may be set in one direction or the other, and which are preferably on opposite sides of the machine. When either lever is operated, a slot in a shaft carrying the lever is moved from alignment with projections on the key-bars to prevent operation of any amount key. Moreover, a cam-plate 39 or 40 on the lever shaft moves a slide 43 rearwardly so as to move a stop 44 to release a spring-loaded lever 45 which then locks the slide 43. The lever 45 releases for operation a one-revolution clutch driven by a power-driven pinion 28 and comprising a mutilated gear 27 on which is pivoted a complementary segment 29. A stud 34 in a cam 32 driven by the clutch co-operates with a finger 60 and a pawl 52 on an arm 53 to rock the latter and through a link 56, a yoke 25 against which the segments 19 are urged by springs. The fingers 15 are thus engaged with the stopplates 11 or 12. The cam 32 then rocks a yoke 22 on which the yoke 25 and the segments 19 are pivoted, thus moving the segments into engagement with the pinions 10. The arm 53 is then rocked to restore the segments and finally they are disengaged from the pinions 10 by the cam 32. The lever 35 determines whether the transmission is additive or subtractive. Operation of the lever 36 in either direction causes a pin 65 in the plate 40 to rock an arm 66 which itself rocks a pawl 56 to enable the pawl 52 to rock freely on the arm 53 so that no entry will be made in the secondary totalizer. In all operations under control of the levers 35, 36 the primary totalizer is zeroized by a yoke 64 operated by a cam 61, Fig. 5, engaged by the stud 34 and connected by a link 63 to the yoke 64. However, when the lever 36 is rocked rearwardly a pin therein depresses a link 68, pivoted to a zeroizing yoke 70 for the secondary totalizer, to couple the links 68 and 63 so that both totalizers are zeroized. Specification 699,914 is referred to.