Patent GB-206798-A (GB)
Abstract: 206,798. Haddan, A. J. H., (National Cash Register Co.). June 9, 1922. C a s h registers with several item-value totalizers; printing totals and sub-totals. - Mechanism is described in connection with total and sub-total taking operations for controlling the engagement and disengagement of the selected totalizer with the actuating racks for printing a sign denoting the kind of total taken, and for ensuring that a key in one only of the banks controlling the totalizer-selection shall be depressed after the totaltaking lever has been positioned. The machine, to which the invention is shown as applied, is provided with the totalizerselecting, keyboard and differential mechanisms described in Specifications 203,994, 203,995, and 205,436. Control of main and printing shafts. The main shaft 65 receives two revolutions in totaltaking operations instead of the normal one revolution, this being provided for by mechanism identical with that described in Specification 8119/15 and including the cam-controlled slide 918, Fig. 19, which through a lever 916, link 917 and arm 915 rocks a shaft 186. To prevent rotation of the printing cam-shaft 534 during the first rotation of the main shaft 65, the pawl 532 for conveying the drive is prevented at the outset from engaging the boss 533 fixed to the hollow printing shaft 534, by the interposition of a stud 955 carried bv a link 1953. When the total lever 75 is moved either way from its central or adding position, a cam groove in the lever effects a slight clockwise movement of shaft 186 sufficient to place the stud in obstructive position. Subsequently the cam-produced displacement of the slide 918 rocks the shaft 186 still farther clockwise and this effects through slot 954 and fixed guide pin 749 a sideways shift of link 1953 resulting in removal of stud 955 from the orbit of pawl 532 and the consequent drive of the printing shaft throughout the second rotation of the main shaft. The release of the machine for operation, controlled bv a sleeve on shaft 57 as described in Specification 205,436, may be effected by a key in any of the control banks, for the total lever is geared by teeth 164 with a rotary cam adapted to displace the sleeve the necessary amount to enable subsequent release by a key in anv one of the banks. Control of keyboard by total-lever. The shaft 186 carries a yoke-bar 188, Fig. 3, which in the preliminary clockwise turning of the shaft engages the amount detent plate supporting-arms to prevent any setting of the amount keys and also to ensure that the zero trip pawls 87 shall remain in effective position during the first part of the main shaft rotation. When the shaft 186 receives further turning, the bar 188 descends upon the tails 929 of the pawls and renders them ineffective so that the differential latches may pass to the positions corresponding with the amounts standing on the totalizer wheels. Depression of a key in any of the control banks except the bank concerned is prevented by connecting the total lever through gearing 174, 176 with discs 178, Fig. 13, formed with notched flanges 179 situated immediately below the tails of the zero pawls of the control banks. The notches are so arranged that with the total lever set for taking, say, a total from a clerk's totalizer, the zero pawls and therefore the detent plates of the transaction and department banks cannot be operated, thus preventing depression of any key in these banks. Conveying totals to the actuating-mechanism. In yielding their total to the differential mechanism the totalizer wheels are stopped in their zero positions by engagement of their transfer teeth with stop pawls 930, Fig. 16, pivotally mounted upon a slide 931 connected by pin and forked arm 933 with a shaft 294. The tails of the stop pawls are connected together by a link 935 drawn downwardly by a spring 934. In the total-taking operation a cam 924, Fig. 19, effects a clockwise movement of shaft 294, Fig. 16, to raise the slide 931 and so place the pawls 930 in the way of the transfer teeth. When a totalizer wheel has rotated to zero, the pawls are rocked and an arm 937 connected with the middle pawl thereupon engages with its toe 938 a sector 939 appertaining to the differential member 228 which is consequently stopped in its upward travel and positions the printing-type accordingly. Timing the engagement of the selected totalizer with its actuating-racks. The timing is controlled bv the setting of the total lever 75 as follows. In taking a total as distinct from a sub-total, the downward movement of the total lever effects through a cam slot 950 the counter-clockwise rocking of a bell-crank 948, Figs. 5 and 12, so that its hooked end 953 descends upon and engages a pin 322 on a lever 317 pivotally suspended on a lever 319. At the same time a pin 951 on the bellcrank lowers the hooked end 323 of a slide 324 to render ineffective the subsequent movement of the latter due to cams 329. When the main shaft rotates and the shaft 186 is turned farther clockwise, as mentioned above, the lever 319 is rocked counter-clockwise so that lever 317 is moved about pin 322 as a pivot and shifts the link 315 to the right (Fig. 5). A pin 314 on this link thereupon travels upwards into the horizontal portion 313 of a stationary cam slot and thus causes the upward displacement of a rod 308 with the consequent engagement of the selected totalizer with the actuating racks. With the automatic return rocking of shaft 186, the parts are restored to normal position and the totalizer disengaged. In sub-total taking operations, the upward movement of the total lever from normal or adding position does not affect the bell-crank 948 owing to the shape of slot 950 and consequently in the subsequent operation of the machine the cams 329 through bell-crank 326, the slide 324 and pin 322 rock lever 317 about its pivot 318 to slide the link 315 to the right and engage the totalizer with the actuating racks. The succeeding action of shaft 186 through lever 319 merely moves the pin 314 farther to the rear in the horizontal portion of the slot 313 which does not affect the totalizer engagement. In the first rotation of the main shaft the plate cams 329 only cause an idle forward movement of the pin 314, but in the second rotation the action of cam 926 effects a clockwise rocking of lever 319 at the same time as the cams 329 are shifting slide 324 and pin 322 to the left. These two movements neutralize each other with the result that the totalizer remains engaged until, towards the end of the second rotation of the main shaft, the bell-crank 326 is again oscillated counter-clockwise and through lever 317 effects the disengagement. Distinguishing printed totals and sub-totals. A type carrier in each type line is rotated by gearing from and in accordance with the setting of the total lever and bears types X for the sub-total positions and type Z for the total positions. Preventing engagement of more than one totalizer line in total-printing. The total lever is geared with a sleeve on shaft 294 and on this sleeve are secured three cams each controlling a slide 301 capable of to and fro movement to connect and disconnect the corresponding totalizerengaging lifter-bar 283 with and from the lifting rod 308. The cams are so formed that one only of these connections can be made at a time and the particular one made depends upon the setting of the total lever.