438,369. Calculating apparatus. MERCEDES BUROMASCHINEN - WERKE AKT.-GES., Benshausen, Prussia, Germany. May 15, 1934, Nos. 14638 and 14639. Convention dates, May 15, 1933 and Sept. 1, 1933. [Class 106 (i)] In a typewriting calculating machine the taking of a total or sub-total digit by digit during a succession of cycles of operation is effected automatically on the depression of a corresponding control key by the operation of the differential actuating sector and its associated type operating parts that are utilized in the entry of the item values. The invention is described as applied to a Mercedes " addelektra " machine with a travelling paper carriage 4, Figs. 1 and 3, supporting a plurality of column totalizers 6 and with a subsidiary carriage S2 supporting a pair of cross totalizers Q1, Q2. The letter keys 32 and numeral keys 33 co-operate in the known manner with the constantly rotating shaft N to effect the raising of the type levers 54 in the printing of the letter-press and numerical data. The shaft N through gearing 28, 56, 59 drives a main shaft 58 on which is loosely mounted a set of operating cams 69, 71, 72 integrally connected by pins passing through holes 70, Fig. 6, in the cams and adapted to be coupled to the shaft by the release of a pawl member 74 rotatably mounted on the cam 72 and provided with a nose 74a adapted to engage the teeth of a wheel 73 secured to the shaft 58. Release of the pawl member 74 is under the control of a lever 114, Figs. 6 and 8, cooperating with an arm 111 on a shaft 99 adapted to be rocked on the depression of a calculating numeral key 34 when a column totalizer 6 is in the computing zone. In this position of a totalizer, a bar 87t, Fig. 9a, thereon rocks a lever 87s so as to free an arm 87u to release a shaft 142 and rocks a lever 87r which through a linkage as shown frees the arm 87a of a shaft 87 and releases a lever 87d so that its end 87d<11> releases a projection 98<11> on a bar 98 pivoted in arms on the shaft 99. When the parts are released, the numeral key 34 is then depressed and a pawl 95 on the key lever 82 engages the upwardly bent part of the bar 98 and rocks it in the clockwise direction thereby causing the arm 111 and lever 114 to render the pawl 74 effective. At the same time a locking bar 110 pivotally mounted on the shaft 99 moves into engagement with a notch 82h on the key lever to hold the key depressed. The bar 110 is held in its displaced position by a projection 120c thereon engaging a recess 120d in a lever 120, the end 120a of which co-operates with the cam 69. Simultaneous depression of two keys is prevented by a known form of crowding lock. The rear end of the depressed key lever 82 coacts with a projection 84 on a corresponding U-shaped member 85, Figs. 4 and 9; each member 85 carries an adjustable stop pin 131 which in its displaced position limits the movement of an associated arm 129 secured to a shaft 128. Each arm 129 is provided with a lug 130, the lugs being of different lengths depending on the digital value of the respective keys. The rotation of the cams 69, 71 and 72 effected by coupling them to the shaft 58 serves to operate the following mechanisms; the arm 114b by its engagement with the cam 72, effects the restoration of the lever 114 to disengage the pawl 74 at the end of the operating cycle ; the cam 69 acts to reciprocate a slide 134 ; the cam 71 through a roller 166 and arm 165 oscillates the shaft 87 ; and the cam 72 through a roller arm 167 reciprocates a slide 170. The slide 134 at its upper end is connected to a curved arm 137 loose on the shaft 142, Fig. 9, and connected by a resilient pin-and-slot connection to a similar arm 136 secured to the shaft 142. By this means the shaft 142 is rocked and the arm 136, through an extension 148 and angle lever 150, rocks the lever 150 and, through its connection with a toothed wheel 159, effects the axial displacement of the wheel 159 on the shaft 158 into engagement with the teeth of the differential actuating sector 174. At the same time a lever 202 on the shaft 142 operates to release a locking lever on the column totalizer to unlock the denomination presented to the operative position. A wheel 189 and its shaft 186 are also unlocked by a tooth 203 on the shaft 142 and another tooth 179 thereon unlocks a wheel 178 on the shaft 158. A latch lever 199 on the shaft 142 operates to release a link 196 connected to an arm 194 on the shaft 87. By the action of the cam 72 the downward movement of the slide 170 through a slot 173 therein acts on a roller pin 175 on the differential sector 174 and swings it in the direction of the arrow p, Fig. 9. The sector 174 is secured to the shaft 128 carrying the arms 129 and its movement is limited by the set stop member 85. This differential movement is transmitted to the wheel 159 and shaft 158. The shaft 158 is connected through a known form of reversing mechanism 180 and shaft 186 to the master wheel 189 which engages a transmission pinion 188 of the column totalizer. The movement of the shaft 158, through a clutch element 161 and wheel 162, Figs. 9, 11, is transmitted through a reversing gearing to a shaft 323, Figs. 11a, 11c, carrying a sleeve 378 adapted to be coupled to one or other or both of the pinions 362, 372 that cooperate with the transmission wheels of the cross totalizers Q1, Q2. The angular movement of the shaft 128 in accordance with the key depressed is transmitted through arms 204, 211 thereon and links 206, 213 to a transverse bar 216 guided in slots in arms 219, 222 secured to the shaft 87. By this means the bar 216 is moved over a projection 35g, Figs. 9 and 13, of the appropriate type numeral key lever 35 so that when the shaft 87 is rocked, by the action of the cam 71 and roller arm 165, the bar 216 depresses the key lever 35 and effects the typing of the appropriate numeral through the usual parts and the shaft N. During this value-entering operation, the aligning tooth 253, Fig. 10, which locks the transmission wheels 189 is freed, to permit of transfer operations, by the movement of the arm 256 on the shaft 142. Further, an arm 384 on this shaft rocks a lever 381, Fig. 11b, operatively connected to a shaft 353 so that this shaft is rocked to release the locking teeth 354, 369 of the cross totalizers Q1, Q2. Before the typing action is completed the cam 69 acts to shift the wheel 159 axially to disengaged position and the return of the shaft 142 effects the locking action of the parts above-mentioned. The paper carriage is then shifted to the next lower denomination and the shaft 87 is rocked back to normal position by the cam 71 to restore the parts associated therewith. The slide 170 is then raised by the cam 72 to bring the differential actuating sector 174 and shaft 128 with the arms 129 back to its initial position. The cam 69 also through the lever 120 releases the looking bar 110 to free the depressed key lever 82 and restores the stop member 85. A springing back action of the cams is prevented by a spring- controlled roller arm 116. In the punctuation denomination of the totalizer, the lever 202 co-operates with a fixed locking element on the totalizer and so prevents rocking of the shaft 142 to set the wheel 189 and release the other mechanisms associated therewith. The reversing mechanism 180 controlling the kind of calculation can be set for addition, subtraction, or non-add by a setting knob 315, Fig. 1, or the change over can be effected by a key lever 293. The change over can also be effected automatically by providing the column totalizers with control plates 301. Taking totals and sub-totals. In the example of use of the machine shown in Fig. 33, the cross totalizer Q1 is actuated additively in the column 4 position and subtractively in columns 5, 6 and 7. In columns 8, 9 both totalizers Q1 and Q2 are actuated additively while in columns 10 and 11 the machine is operated to print the totals from the cross totalizers and add them in the column totalizers 6<10>, 6<11>. The putting into action of one or both cross totalizers is effected by shifting the sleeve 378, Fig. 11c, by a linkage controlled by a plate 378y on the column totalizer. When the totalizer 6<10 >reaches the computing zone it is tabulated to the correct denominational position and the plate 301, which is set in the subtract position, rocks a lever 303, Fig. 21, and, by its engagement with a pin 309 on a rock plate 311, displaces a control plate 298 thereby rocking a shaft 300 to reverse the gearing associated with the shaft 323. The bar 378y at the same time puts the sleeve 378 into operative engagement with the cross totalizer Q1. The total key 329 is now depressed and is held depressed to permit the cams 69, 71, 72 to undergo a number of cycles of operation. The depressed key lever 330, Fig. 11, raises a slide 337 which displaces a slide 342 to effect the rocking of the shaft 300 if by any means the control plate 301 has not been set. The slide 342 has projections which are moved into co-operative relation with the aligning teeth of the cross totalizers to hold the wheels to the left of the driving wheels 362, 372 against movement. The mechanism above described, that is operated by the cams 69, 71 and 72, then functions to return the denominational wheel of the cross totalizer to zero and enter the corresponding setting on the wheel of the column totalizer 6<10> and print it on the work sheet. The operations are repeated denomination by denomination; when the lever 87a, Fig. 9a, enters the notch 87t<1> between the totalizers 6<10>, 6<11>, the lever 87r is rocked and:by the linkage shown causes the nose 87d<11> of the lever 87d to prevent movement of the bar 98 and the shaft 99 so that the lever 114 is in position to uncouple the pawl 74 and arrest the cams. In the upward movement of the lever 337 an extension 385 thereof raises a lever 263x so as to couple a pawl 267x thereon to a projectio