420,807. Calculating - machines. NATIONAL CASH REGISTER CO., Dayton, Ohio, U.S.A.-(Assignees of Lee, C. L. ; 223, Volusia Avenue, Oakwood, Dayton, Ohio, U.S.A.) April 8, 1933, No. 10542. Convention date, April 14, 1932. [Class 106 (i)] A calculating - machine having several totalizers, at least one of which can be used for addition and subtraction, is provided with an overdraft key which, when depressed after the occurrence of an overdraft in the adding and subtracting totalizer, initiates a plurality of continuous cycles of operation whereby the overdraft is converted from the complementary form in which it initially stands on the totalizer and is printed in positive form. General operation. The invention is described as applied to an Ellis machine of the type shown in Specifications 28253 /08, 241,983, [both in Class 106 (i)], and 344,040 and having three adding and one adding and subtracting or " balance " totalizer. The depression of the overdraft key releases the machine for three cycles of operation. During the first cycle the overdrawn amount (in complementary form) is cleared from the balance totalizer and added into an auxiliary accumulator. During the second cycle this complement is cleared from the auxiliary accumulator and transmitted subtractively to the balance totalizer, which then contains the true overdraft. During the third cycle the balance totalizer is again cleared and the true overdraft printed in a distinctive colour. The printing mechanism is disabled during the first two cycles, Releasing machine for normal operations ; normal line and column spacing. The release bar 92, Fig. 13, is divided into two parts. Depression of the upper part causes machine operation and line spacing and of the lower part machine operation and column spacing. Depression of the upper part moves a stem 395 to rock a release lever 384 which starts the machine operation. A pin 399 on the stem 395 turns clockwise a lever 401 to block the movement of a lever 404 pulled by a spring 427. When a printer shaft 245 rocks clockwise, a pin 418 on an arm 417 engages under the end of a pawl 412 pivoted to a lever 413. On the return movement of the printer shaft the pin 418 rocks the lever 413 through the pawl 412 to actuate the line - spacing mechanism. Depression of the lower end of the release bar rocks anticlockwise a plate 390 actuating the release lever 384. The lever 404 is in this case free to turn anticlockwise when a link 406 pivoted at 382 to the release lever 384 is withdrawn from a pin 403 on the lever 404. A link 410 is thus moved to the left and, by a foot 434 engaging a pin 411 on the pawl 412, rocks the latter out of the reach of the pin 418, so disabling the linespacing mechanism. Simultaneously, an arm 419 on the lever 404 moves a masking plate to allow a pawl on a printer-operating link to engage a stud on a lever actuating the columnspacing mechanism. Preventing manual column-spacing during the overdraft converting and printing operation. When the overdraft key 93, Fig. 24, is depressed a pin 375 blocks the movement of a manual column-spacing lever 377. Adding and subtracting. The balance totalizer is controlled for addition in known manner by stops on the carriage and for subtraction both by carriage stops and by a subtract key 90, Fig. 15. When this key is depressed a latch 111 and a lever 115 swing clockwise and move cams 120, 121 into the path of a flying lever 122 connected by a link 124 to the totalizerengaging cams. The lever 115 through a link 131 rocks anticlockwise a lever 132 to allow a pawl 135 to be moved by a pin 148 on the link 124, the pawl when moved rocking a bar 140, Fig. 33, which conditions the transfer mechanism for subtraction and sets the overdraftshaft operating means. Overdraft-controlled total-key lock. When the balance totalizer passes into an overdrawn condition the highest subtract transfer pawl 150 is rocked clockwise by a cam 151 on the totalizer wheel. A member 153 is then unlatched to be swung clockwise by a spring 155 until it contacts a bar 156. This bar is later moved to the left and the further swinging of the member 153 causes an overdraft shaft 164 to rook anticlockwise and to lock the balance totalizer total key 85 by known means 166, 169, 172. If the totalizer is now set for addition the bar 140 moves to block the member 153 and to release a restoring member 173 which, when a positive condition is attained, is rocked to restore the shaft 164 as the transfer pawl 149 is actuated by the passage of the highest numeral wheel through zero. Overdraft converting and printing operation. This operation is initiated by depressing the overdraft key 93, Fig. 23. When an overdraft occurs a plate 194 is rocked anticlockwise by a link 193 connected to the overdraft shaft 164. A projection on the plate is thus moved from beneath an ear 197 on the keystem to unlock the key. The key is held depressed by a detent 198 connected by a link 199 to a lever 200 rocked anticlockwise by a cam 363 on a cam sleeve 211 to release the key at the end of the third cycle. The detent 198 is during this releasing motion rocked sufficiently far to cause an ear 366 on the detent to engage a latch 367 pivoted to the plate 194. A spring 201 then returns the link 199, detent 198 and latch 367 to rock the plate 104 and so restore the overdraft shaft. The keystem 93 is connected to the release lever 384 and when the key is depressed the machine operates for three cycles. A crank 205, Fig. 24, on a main shaft 52 oscillates a hook 204 at each machine operation. When the overdraft key 93 is depressed a pin 203 thereon lowers the hook 204 to connect a slot 206 in the hook with a pin 207 on a member 208 which is thus caused to reciprocate. The member 208 carries pawls which drive a cam sleeve 211, the sleeve rotating once for three complete oscillations of the main shaft 52. Disabling printing mechanism. A link 229, Fig. 23, on the overdraft keystem moves a latch 231 to release a lever 234 which is then rocked by a spring 251 until a roller 236 contacts with a cam 237 secured to the sleeve 211. A link 241 connected to the lever 234 unlatches the printer-operating link 242 from a stud 247 on a driving plate 51 and the printing mechanism is thus disabled for the first two overdraft cycles. At the end of the second cycle the cam 237 rocks the lever 234 anticlockwise to re-engage the stud 247 with the link 242 so that the overdraft amount can be printed during the third cycle. Control of balance totalizer during overdraft converting and printing operation. A link 253, Fig. 30, pivoted to the overdraft key 93 rocks a detent 255 to release a lever 257 pivoted at 220. A spring 296 turns the lever 257 clockwise until a roller thereon contacts with a cam 259 on the sleeve 211. This movement through a shaft 262 rocks a lever 266, Fig. 16, having forked arms which engage a pin 267 on the balance totalizer total-key latch 268 and so condition that totalizer for total-taking during the first overdraft cycle. During the second cycle the cam 259 swings the lever 257 and shaft 262 anticlockwise and, through a lever 263, link 264 and lever 144, causes the balance totalizer to be actuated subtractively so that the complementary amount cleared during the first cycle and stored in the auxiliary accumulator is now subtracted from the balance totalizer. During the third cycle the cam 259 again conditions the balance totalizer for total taking, the true overdraft then being cleared and printed. Auxiliary accumulator. This comprises a series of toothed wheels pivoted in a frame 301, Fig. 2, carried by arms 300 secured to a shaft 304. When the complementary overdraft is being cleared from the balance accumulator luring the first cycle the auxiliary wheels are meshed with racks 322 secured to the differential actuators 71, the engagement being effected by cam arms 318, Fig. 19, on a shaft 220 which is rocked by a cam on the sleeve 211 acting on an arm 316. During the second cycle the complementary overdraft is cleared from the auxiliary accumulator, each wheel thereof in returning to zero controlling the movement of the corresponding actuator 71 with which actuators the balance totalizer is at this time subtractively co-operating. The wheels of the auxiliary accumulator are arrested in their zero positions by broad teeth on them contacting with stops on the frame 301. Distinguishing marks and colours; inkribbon mechanism. The lever 266, Fig. 16, engages a pin on a slide 273 connected to means which cause a distinguishing symbol to be printed adjacent the overdraft. During normal operation an arm 350, Fig. 9, on the printer ;haft moves clockwise and through a link 349 rocks a lever 348 having a pin 345 engaging a ink 334 which thus rocks a lever 335 to raise the black ink ribbon 342 to the printing line. The printer shaft 245 carries a lever 244, Fig. 8, having a pin 327 which lowers a link 325 so that its end 324 is moved below a pin 323 oscillated about a centre 63 at each cycle. During the first overdraft cycle the shaft 245 does not move and the pin 323 pushes the link 325 to the right to rock a shaft 329 connected at 332, 333, Fig. 9, with the link 334. This link is thus engaged with a stud 346 so that, when the arm 350 rocks during the third overdraft cycle, the lever 335 has a greater movement to raise the red ribbon 342 to the printing line. The link 334 is restored to its normal position at the end of the third cycle by a pin on the arm 350 acting on a pawl and link not shown in Fig. 9. Overdraft indicator. An indicator 182, Fig. 5, normally shows a " plus " sign through an opening in the keyboard. When the balance totalizer becomes overdrawn and the link 166, Fig. 33, is moved by the overdraft shaft 164, a pin on the link rocks the indicator 182 to display a " minus " sign.