Patent GB-185075-A (GB)
Title: Improvements in totalizing-counter selecting and actuating mechanism for calculating machines
Filed: 1921-02-26
Abstract: 185,075. Haddan, A. J. H., (National Cash Register Co.). Feb. 26, 1921. Statistical machines; differential mechanism. - In machines such as that described in Specifications 158,180 and 184,824 wherein from a number of totalizers one or more is selected and subsequently actuated in accordance with the data represented by perforations in a record-strip, a particular form of .electromagnetically-controlled differential mechanism is employed for effecting both the selection between stops 921 by cam and lever mechanism controlled from the shaft 600 once during each cycle of the machine. Above and below each slide is a bar 923 drawn normally to the right, Fig. 9, by a spring 926. These carry pins 931 which engage the legs 918 of the stops. The latter are held up by springs 927 against pins 922 on the slide 919. One stop in the lower row has a leg 937 engaging a lever 707. The contacts 700 for the magnet 48 are moved up once during each cycle, and if the leg 937 is in the flat of the lever 707 as shown the contacts are forced together and the circuit of the magnet 84 made. This occurs when a totalizer wheel passes from 1 to 0. An arm 935 of a lower stop is continued upwards and an arm 933 of an upper stop continued downwards to engage the pin 934. The totalizers are cleared in the order 0 tn 99. A group of three switches 947, 948, 949 select the totalizer, the first two selecting the group and the last 949 the particular totalizer from the group. The second group of two switches 950, 951 set up the recording devices to denote the group and individual number of the totalizer selected. The electrical circuits are described. and the actuation of the totalizers. In the totalizer-selecting mechanism thown in Fig. 1, a constant-excursion member 61 is secured to a shaft 48 oscillated rotarily by an arm 52 engaging a cam-race 54. Loose upon the shaft 48 is the differentially moving member 62 provided with a rack 63 and a latching-bolt 66 suspended by bell-crank levers 67, 71 from pivots 70, 73. The lever 67 is also pivoted at 68 to the rack, and the lever 71 is connected to a spring 74 for urging the bolt outwardly to engage an abutment face 76 on the driving-member 61. In operation this member carries the differential member 62 with it until the energization of an electromagnet 84 connected with the record-strip analyzer throws a detent 82 into engagement with the rack 63, which thereupon stops, the bolt then leaving the face 76 and engaging the surface 77. A toothed sector 85 pivoted at 86 and gearing with teeth on the totalizer shaft rack 29 is jointed at 88 to a beam 87 connected with the differential member 62 bv a link 89. When the beam has been differentially positioned by the member 62, the oscillation of shaft 49 produced by cam race 57, Fig. 3, causes the final differential setting of the beam and. therefore of the sector and rack. An aligning-pawl 98 controlled through shaft 50 and cam-race 60 co-operates with a toothed sector 97 on the shaft 86. Removably mounted between tie-rods 40, 42 is a double bank of contacts, each consisting of ten fingers 1-0, 1-1 &c., Fig. 4, and a common contact plate 111. The differential member 62 carries two contact blades, each of which comprises a long and a short finger to bridge the contact plate 111 and the differentially-selected finger 1-0 &c.