Patent GB-496720-A (GB)
Abstract: 496,720. Calculating-machines. MERCEDES BUROMASCHINEN - WERKE AKT.-GES. June 1, 1937, No. 15180. Convention date, June 12, 1936. [Class 106 (i)] A calculating-machine having means for automatically taking a total from a totalizer denomination by denomination, said means including type members selected in accordance with the digits of the total by mechanism comprising a shaft provided with selecting fingers, is characterized in that a swinging frame carrying selecting levers is interposed between the shaft and the control devices for the type members, the frame being swung to and from operative position to control the typing of each digit. Tabulating mechanism. Depression of a tabulating key 14, Fig. 4, causes the paper carriage 2 to move to its left until a carriage stop 20 engages a stop. bar 22 lifted by the depressed tabulating key. Entering and printing items. The depression of a numeral key 16, Fig. 4, releases a corresponding power-driven cam 42a for one rotation. An actuating slide 46, Fig. 6, bearing on the cam thus descends and rocks a frame 47 secured to a shaft 50, the frame carrying release levers 53, one for each totalizer. Each lever 53 releases the correct denominational train in its totalizer. Four totalizers, 5-8, Figs. 2 and 4, are shown, totalizer 8 being a balance totalizer, driven by respective master actuating wheels 39, 31, 32, 40. The wheels 39, 40 are secured to an actuating shaft 30 and the wheels 31, 32 are free on this shaft but can be clutched thereto by a clutch 29 operated by cams 23-25 carried on the totalizers. These cams also operate mechanism to determine the kind of operation to be performed and to release detents from the calculating mechanism. The shaft 50, Fig. 6, has an arm 56 with a cam-shaped end 57 which slides to the left a slide 59 to rock an actuating segment 58 about its pivot 60 into engagement with a pinion 62. The pivot 60 is carried by a bar 66 pivoted about an axis 66a and provided with a rod 63 engaged by slots 46b in the actuating slides 46. These slots are shaped so that the bar 66 is rocked through a differential angle depending on the numeral key and actuating slide in operation, this differential movement being transmitted through the segment 58, pinion 62, shaft 61 and gearing 67 to the actuating shaft 30. A projection 75 on the actuating slide engages the power-operated printing mechanism 81, Fig. 4. Taking positive totals from balance totalizer. The correct tabulating key 14, Fig. 4, is depressed to bring the highest figure-containing denomination of the balance totalizer 8 adjacent the master wheel 39, Fig. 6, on the shaft 30. A control cam on the totalizer 8 thereupon depresses a lever 27, Fig. 7, to move to the left slides 95, 98 which slide the pinion 67 to reverse the gearing connection between the shafts 61, 30, Fig. 6, whereby the shaft 30 is driven in a subtractive direction. The total key 17, Fig. 13, is then depressed and is latched down by a latch 117, 119 which engages a ribbed bar 128. The end 121 of the total key lever lifts a slide 139, Fig. 7, which rock a lever 143 having a forked end engaging pin 146 on a slide 147 whereby the slide is moved to the right to place its end beneath a totalizer-wheel zero stop 154 secured to a bar 156 pivoted at 159. The total key 17 also releases a spring pawl 134, Fig. 13, which thereupon couples cams 129, 131 to a continuously-rotating power-driven shaft 43. Cam 131 allows a release slide 179 to be lowered by springs, the slide having an end 224, Fig. 8, engaging an arm 225 which rocks the shaft 50, this shaft carrying an arm 160, Fig. 7, which raises the slide 147 to lift the zero stop 154 so that it can block large teeth 274, Fig. 16, on pinions 273 in the totalizer 8. The arm 225, Fig. 8, has a projection 234 which rocks clockwise an arm 235 secured to a shaft 236 carrying a second arm 238 which slides to the right a pinion 243 coupled to the shaft 61 to engage this pinion with teeth 247 on a zeroizing slide 191. A projection (not shown in Fig. 8) on the release slide 179 rocks a latch pawl 215 to free teeth on a plate 214 secured to the zeroizing slide 191 whereupon this slide descends under the action of a spring 295b, Fig. 12, which pulls a slide 293, 295 having teeth 294 engaging a pinion 208, Fig. 8, coupled to a pinion 203 gearing with further teeth on the zeroizing slide 191. This slide thus drives the shafts 61, 30 to rotate the totalizer wheel backwards to the zero positions determined by the stop 154. The slide 293, 295 also drives a shaft 299, Fig. 12, carrying a number of selecting fingers 325 spaced at equal angles around the shaft. Each finger 325 is adjacent a corresponding selecting lever 326 pivoted on a shaft 317 carried in a frame 327, 319, Fig. 13, pivoted at 368. A pin 272 on the release slide 179 has previously rocked a lever 345 which moves to the right a slide 347 carried on the side 319 of the frame 327, 319, a projection 351 on the slide 347 thus coupling the side 319 with a hooked part 352 of a link 356 pivoted to an arm 360. The arm 360 is now lowered by the cam 129 whereby the frame 319, 327 is rocked clockwise and the end of one of the levers 326 engages that one of the fingers 325 corresponding' to the digit originally in the operative denomination of the totalizer. This arm 326 is thus rocked to engage the end 332, Fig. 4, of the corresponding lever 76 to cause the corresponding digit to be typed by the power-driven typing mechanism 81. The cam 129 also rocks a lever to move the carriage one step to the left, whereupon the total-taking action is repeated in the next lower denomination. When the carriage moves to bring the lowest denomination of the totalizer 8 into the operative position, a cam on the totalizer 8 engages levers which release the total key latch to terminate the total-taking action. Taking negative totals from balance totalizer. The totalizer 8 is provided with a second series 284, Fig. 16, of numeral wheels having numerals arranged complementarily with respect to the numerals on the ordinary wheels 74. When the balance in the totalizer becomes negative, a lever 288 is operated manually to introduce the fugitive one and to move a slide 285 to cover the ordinary wheels 74 and expose the complementary wheels 284. The slide 285 rocks a lever 105 so that the lever can depress a lever 28 when the totalizer runs into the total-taking position, a link 418, Figs. 7 and 19, thus being moved to the right to rock a lever 423 to place its end 484 over an arm 479 and to cause a fork 474 to place a part 475 of a lever 477 over a projection 485 of a lever 486 pivoted to a latch 489. The total key 17 is now depressed and swings a lever 501 to rock anticlockwise the lever 477 which,by the connection 475, 485, 486, swings the latch 489 to free a pawl 490 which thereupon couples a cam 482 to the continuously-rotating shaft 43. The cam 482 rocks the lever 479 to lift the lever 423 in its slotted pivot 424, the lever 423 rocking a lever 430 which depresses the subtraction key lever 438. The subtraction key lever has a pin 442, Fig. 18, which rocks anticlockwise a lever 443 carrying a pin 447 engaging a slot 448, Fig. 7, in the slide 98 which controls the setting of the addition-subtraction change gear 67. This gear has been set for subtraction as described for positive total-taking but the pin 447 lifts the slide 98 whereupon the cam-shaped part of the slide acts on a pin 98 and causes the slide to move to change the gearing connection 67 to addition. The subtraction key is held depressed by a spring- controlled latching key 455 and the total-taking operation proceeds as in positive total-taking excepting that the totalizer wheels are rotated in additive direction to zero. At the conclusion of the operation, the subtraction key is released by the manual depression of the latch key 455. Should this be omitted, the depression of a tabulating key or the carriage release key to position the carriage for a new entering operation rocks the shaft 405 and so, by arm 469 and connections 466, 460, rocks the latch key. Printing negative totals in distinguishing type. The cam 482, Fig. 19, acts on a lever 492 connected to an arm 495 which controls the platen by means not shown, to bring into printing position type having a different face. The type-face shift keys 452, Fig. 18, are also rocked by a connection 449 when the subtraction key 438 is automatically depressed as described above. An arm 488 moving with the keys 452 holds the lever 486 so that a projection 486a on said lever stops the cam 482 after three-quarters of a revolution. When the subtraction key is released by the latch 455 the arm 488 lifts and the cam rotation is completed, the type-face-changing parts returning to normal positions. Clear sign printing. Automatic carriage return to right after total taking. When all the wheels of the balance totalizer 8 are at zero a lever 276, Fig. 16, can be unlocked to release the clear sign printing key which, when depressed, causes the printing of the clear sign and the movement of the carriage one step to the left. A cam on the totalizer then moves a slide 401, Fig. 18, to the right to engage the automatic carriage-return mechanism. Disabling automatic carriage-return mechanism. This mechanism is disabled when a tabulator key or the carriage-release key is operated, these keys rocking a shaft 405, Fig. 18, connected by levers and links to a lever 410 which rocks clockwise to depress the end of the slide 401 below the path of the totalizer cam. Locking total key in a certain carriage position. When the totalizer 7 is in the calculating position, a cam on it moves to the right a slide 169, Fig. 7, to the left to move a slide 514 to the right to bring its bent end 518 into blocking position over the top of the bar 139 raised by the end 121 of the total key lever so that this key cannot be depressed. Specifications 361,484 and 438,369 are refer