Patent GB-191204680-A (GB)
Title: Improvements in Calculating and like Machines.
Filed: 1911-04-19
Granted: 1912-07-19
Abstract: 4680. Marks, E. C. R., [McCaskey Electric Calculator Co.]. April 19, 19.11. Adding and subtracting apparatus w i t h operating-means. - Relates to the adjustment of key-set machines for addition or subtraction by an initial key-movement which merely sets the parts, the engagement between the racks and t h e receiving pinions of the totalizing-counter being subsequently positively brough about by mechanism co-operating with the main shaft. Double actuating-racks connected to the differential main slides are provided for each denomination, one rack extending on one side of the pinion and the other upon the other, and the transfer racks are similarly double, the totalizer being always in engagement with either the actuating or the transfer racks, and the sequence of engagement being determined by the operation-controlling keys (not shown). The primary totalizer gears directly at will with a secondary totalizer, which is also laterally slidable in order to vary the engagement by integral powers of ten. The keyboard and stop mechanism for controlling the main slides may be that described in Specification 4376/12. The apparatus may be combined with the multiplying-apparatus described in Specification 9563/11. Numeral-bearing elements.-The numeralwheel shaft 116, Fig. 9, passes loosely through grids between the wheels, and is connected by means of a key-way 117 with eccentrics 118, the wheels being mounted so as to turn freely upon sleeves 119 but to rotate with their receiving- pinions 121. Each wheel is of a built up nature. carrying a figure-rim 126, with figures repeated three times, and for each wheel there is a forked, double-toothed actuating-rack 131, which is adjusted at its forward end, for addition or subtraction, by rotation of the numeral-wheel shaft and its eccentrics which bear against guide-plates 132, 133 upon the racks, and at its rear end by a swinging movement of a guide-bar 134 which is simultaneously effected. Transfer mechanism of the externallyoperated kind is adapted for use in either direction of rotation. Transfer pins 125 upon the lower wheel displace a round V-shaped point 150 upon a lever 151 which is thereby swung so as to raise its rear end and so release a lever 155 for a similar spring-operated rearward movement. With this lever swings a triplever 161 of which an arm 163 thus drops behind a forked double-toothed transfer-rack 165, and upon the return movement of the levers, effected by a cam 150 upon a transferoperating shaft 172, this rack is given a forward stroke, the engagement being above or below the receiving-pinion according to the setting of a guide-bar 168. The above operations are so timed that the receiving-pinions are always in engagement with either the actuating or the transfer racks. Resetting of the transfer racks occurs when a resetting-bar 174 moves rearwards, displacing the trip-levers 161, and freeing the springs 177 to withdraw the racks. The shapes of the transfer cams are such as to produce a successive transfer operation from the lower to the higher denominations, thereby accounting for consequent transfers, and the cams, together with the resetting-bar, are operated, by means of suitably-timed gearing, from the main shaft 1171 of the machine, which is motor-driven. Differential mechanism. - The connexion between the main slides 213, Fig. 1, and the actuating-racks 131 is by means of levers 205, loosely pivoted upon a shaft 203 and having pin-and-slot connexions to both racks and slides. Springs 207 carry the racks &c. forwards until the depending arms 222 are arrested by the selected pins of the differential denominationselector 45, but normally the depending arms are held in the rearward position shown in Fig. 1 by a yoke 204, which, during the operation, is swung forwards to allow the racks to come to the set position and is subsequently returned to reset them. Detent mechanism; adding and subtracting, setting - mechanism for. When the addition key, described in Specification 5651/12, is depressed, a rod 223, Fig. 43, moves forwards, and by unhooking a vertical arm 225 it frees an engagement-determining lever 232 for clockwise movement effected by a spring 229. A pin 233 upon this lever thereupon passes along the bottom of a cam member 234, Fig. 5, carried by a lever 143 which controls the engagement. For this purpose a switch 236 mounted upon the controlling-lever is simultaneously set in the opposite position to that shown, by the rearward movement of a second key-operated rod (not shown). The operation of the main shaft of the machine results in a resetting of these parts by cam action. The subtraction key is arranged to move the rod 223 only. While the actuating-racks 131 are moving forwards, the transfer racks 165 are in an intermediate and disengaged position, and a similar set of selecting-parts is provided in order to put these racks into gear for addition or subtraction transfers upon the rearward stroke of the main slides, the engagement of the receiving-pinions with the transfer racks being timed to precede the disengagement of the actuating-racks, and vice versa, so that the wheels are always maintained in alinement. With several totalizers; transfer mechanism. -A secondary totalizer is mounted in a carriage 256, 257, Fig. 29, upon a hollow transverse beam 254, the numeral wheels, upon a spindle 265, having each a transfer tooth 266 adapted to displace a lever 278 and thereby release a spring-controlled transfer segment 267 pivoted on a rod 268. To engage the secondary wheels with those of the primary totalizer for actuation thereby the frame of the secondary wheels is swung downwards, while the wheels are out of engagement with their transfer segments, and any operated transfer segments then strike a bar 259 upon the frame and become relatched by detents 272. As in the case of the primary totalizer, the numeral wheels are always in engagement with their actuating members or transfer segments, or with both. When the secondary totalizer is zeroized by reverse rotation imparted by the primary totalizer, the zero point is determined by the rear edges 266<a> of the transfer teeth abutting against other portions of the transfer mechanism. Mechanism is described for rotating the secondary totalizer about the shaft 261 for engagement with the primary wheels, and also for producing manually an endlong shift of the secondary totalizer whereby the relative order of engagement may be varied.