516,693. Calculating-machines. MERCEDES BUROMASCHINEN-WERKE AKT.-GES. July 5, 1938, No. 19867. Convention date, Aug. 7, 1937. [Class 106 (i)] In a typewriting- calculating machine having means for taking totals and subtotals automatically, denomination by denomination, this means including members additional to the differential actuating mechanism, one of the additional members and the differential-actuating member are connected to the totalizeractuating shaft during total and subtotal taking, the additional member driving the shaft while the operative denomination is being zeroized. In total taking, the additional member and the differentialactuating member are both disconnected after this zeroizing, but in subtotal taking the differential-actuating member remains connected to the totalizer-actuating shaft to restore the amount to the totalizer. General operation.-The machine described has six totalizers mounted on the paper carriage being "idle" and used only to carry control cams. The other totalizers are divided into two pairs. The numeral wheels of one totalizer of a pair have their numerals arranged in the opposite direction to that of the numerals of the other totalizer in the same pair. If the same amount is entered in the same direction into two such totalizers, it will thus appear in positive form in one and in complementary form in the other. A subtotal taken from one totalizer may be transmitted to another totalizer. Selection and actuation of totalizers.-Distinguishing marks. Subtraction. Six master - totalizer-actuating wheels 195, 172, 173, 194, 220, Fig. 6, are arranged on the totalizer-actuating shaft 141. Of these, two (172, 173) are keyed to the shaft, the others being connected thereto when required by slidable couplings 23,24,25,223. The totalizer-actuating shaft 141 is driven from the differential-actuating shaft 67, Figs. 5, 7, through reversing gearing 66, 140, the differential-actuating shaft being actuated by the differential-actuating sector 79. The reversing gearing is operated by cams 'carried by the totalizers, these cams depressing a bellcrank 34, Fig. 7, to move to the left a link 36 engaging a pin 39 secured to a lever 40 and co-operating with a notch 39a in a link 43 whereby this link is also moved to the. left to rock an arm 62 operating the reversing mechanism whereby this mechanism is set for subtraction. The reversing mechanism is also operated by key 59 which rocks anticlockwise a lever 52 about a pivot 48, a pin 45 on the lever 52 engaging a slot 44 in the link 43 to lift this link so that another notch 42a therein co-operates with another pin 42 secured to the lever 40. The camming action between the notch 42a and the pin 42 returns the link 43 to the right if it has previously been moved to the left by a totalizer cam and the reversing gearing is thus restored to adding condition. If the key 59 be depressed when the reversing gearing is set for addition, the link 43 is lifted and the cam slot 42a and pin 42 co-operate to move the link to the left to set the gearing for subtraction. The key 59 thus . supersedes the carriage control and when depressed reverses the setting of the reversing gearing. The key 59 also depresses a key 8 to change the type face. The master wheels 183, 194, Fig. 6, are uncoupled from the totalizeractuating shaft 141 by movement to the right of a link 178 having fingers 180, 190 engaging the 'corresponding slidable couplings 24, 25. The link 178 is operated by the action of cams on the totalizers on a lever 175 connected to the link. A pin 202 in the link 178 engages the slotted end 203 of a link 200 having a finger 199 operating the slidable 'coupling 23 of the master wheel 195. The slot 203 allows the three couplings 23. 24, 25 to be operated together or only the two couplings 24, 25 to be operated depending upon extent of movement imparted to the lever 175 by the operative control cam. 'The differential - actuating mechanism is unlocked by cams on the totalizers, these cams rocking a latch to release an unlocking shaft 73, Fig. 5. Total taking.-To take a total from a desired totalizer, the several denominations of the totalizer are engaged seriatim with the master wheel 172; the highest digit-containing denomination being engaged first. The total key 12, Fig. 4, is then depressed and is latched and released as described below. The total key clutches cams 142, 143, to a continuously-rotating shaft 144. The cam 142 allows a release slide 121 to descend, a projection 122, Fig. 5, of the slide engaging a pawl 102 which rocks a member 101, abutting a member 104, 105 secured to the shaft 73 this shaft then being reversed clockwise. The member 101 also rocks an arm 106 on a shaft 98 having another arm 96 which moves a pinion 91 on the differential-actuating shaft 67 into engagement with teeth on a zeroizing slide 100, Fig. 6. The pinion 91 is maintained in engagement with the slide 100 by a latch 108, 111. This zeroizing slide thereupon descends as described in Specification 496,720 and drives the differential-actuating shaft 67, reversing gearing 66 and totalizer-actuating shaft, the denomination of the totalizer in engagement with the master wheel 172 being thus returned to zero in the reverse direction to the normal actuating direction. This reversal of direction is secured by the proper setting of the reversing gearing by cams on the totalizers or by the key 59, as described above. The amount withdrawn from this denomination is printed as described in the above mentioned Specification and the next lower denomination is then engaged, and so on. The latch 108, 111 is released to disengage the pinion 91 from the zeroizing slide 92 at the end of the cycle by a link 116 operated by a power-driven cam. The zero position in each denomination is determined by the engagement of a projection adjacent the numeral wheel with a stop 291, Fig. 7, moved towards the totalizer when the total key 12 is depressed, the end 148 of the total lever lifting a link 150 which rocks a bellcrank 283 engaging a pin 286 to move to the right a slide 285 having a sloping edge 289 which lifts an ear 290 of the stop 291. When the unlocking shaft 73 is rocked as described. above an inclined link 299 connected thereto is moved forward and lifts the stop 291 still further, into its operative position. The total may be transmitted by means described below to the totalizer engaged with the master wheel. Subtotal taking.-The highest digit-containing denomination of the totalizer concerned is engaged with the master wheel 172 and the subtotal key 255, Figs. 4, 5, is depressed. A projection 262 secured to the subtotal key overlies the total key and depresses this simultaneously with the subtotal key. These keys are latched and released as described below. The total key causes the release slide 121 to descend as described above, its end 122 engaging the member 102 to rock the member 101 and the unlocking shaft 73. The member 101 rocks the member 106 to engage the pinion 91 with the zeroizing slide 100 Fig. 6, which thereupon rotates the numeral wheel under consideration back to zero as described above. An arm 74, Fig. 5,'secured to the unlocking shaft 73 has an offset end 75 which swings the differentialactuating sector 79 about its pivot 81 into engagement with a pinion 80 on the differentialactuating shaft 67. As' the numeral wheel turns to zero the differential-actuating sector 79 and the differential-actuating frame 85a are rocked differentially anticlockwise against the action of a spring 89. In total taking, the release slide 121 releases the member 102 at the end of the downward movement of the slide, the unlocking shaft 73 returning to normal position, since an arm 233 on the shaft rocks and so escapes past a pawl 228 pivoted.to'the release slide, the arm 74 on the unlocking shaft 73 disengaging the sector 79 from the pinion 80. When the subtotal key is depressed, however, a lever 253 thereon rocks a lever 241 so that its end 237 blocks the pawl 228. At 'the end of the downward movement of the release slide 121 the pawl 228 cannot now rock and the arm 233 and unlocking shaft 73 cannot return to normal position. The differential-actuating sector 79 then remains engaged with the pinion 80 and the spring 89 returns the frame 85a and the sector to their initial ,positions, the digit withdrawn being re-entered by the sector 79, gear 80, differential-actuating shaft 67, gearing 66, totalizer-actuating shaft 141 and master pinion 172. A subtotal is printed in the same manner as a total. Transmitting totals and subtotals to other totalizers.-As the release slide 121, Fig . 6, descends, a projection 301a thereon rocks a lever 304 connected by a link 312, 313 to a slide 319 which operates the coupling 223 to connect the master wheel 220 to the totalizer-actuating: shaft 141. As this shaft is rotated to zeroize a numeral wheel, the corresponding digit is. entered into the totalizer in engagement with the master wheel 220. Key-detent and key-release mechanism.-Thetotal key 12, Fig. 4, is held depressed by a detent 342 which engages over a fixed bar 154. This detent 342 is released when the totalizer moves a step after total-taking' from the units denomination, by the engagement between a cam on the totalizer and a pawl 164, A Fig. 7, on a lever 158 having a vertical link 157 engaging and depressing the end of the detent 342. As stated above (subtotal taking), the depression of the subtotal key 255, Fig. 4, pulls down the total key by means of the projection 262. A detent 265 is pivoted to the total key and during the' descent of the total key is rocked clockwise by a fixed bar 274 to hook itself over the projection 262 and thus hold the subtotal key depressed, until the total key is released.