Patent GB-380551-A (GB)
Abstract: 380,551. Calculating - apparatus. MERCEDES BœROMASCHINENWERKE AKT.-GES., Benshausen, Mehlis, Zella, Thuringia, Germany. July 24, 1931, No. 21168. Convention date, Feb. 14. [Class 106 (i).] A combined typewriter and calculating machine is provided with two carriages one of which, viz. the totalizer carriage, is controlled by the usual escapement mechanism, and the other, viz. the paper carriage, is displaceable independently of the totalizer carriage. By this means a schedule or other printed form can be completed by printing columns of amounts and charges, the items which succeed one another in a vertical column being added in a positive or negative sense in the various column totalizers, while the sum and difference is obtained in the cross totalizers. The invention is shown applied to a known type of Mercedes " Addelektra " machine comprising a totalizer carriage 4, Figs. 1, 2, and 3, with a supporting rail on which the column totalizer 67 .. 91a are mounted and with an escapement mechanism for effecting its control. The selected totalizer is actuated on depression of a numeral key 41 by coupling a corresponding one-revolution clutch cam 51 to a constantlyrotating shaft 39 whereby the cam reciprocates a differential actuating slide 60 and rocks a toothed sector adapted to drive a master wheel H through reversing mechanism. The slide 60, through a lever 95 and constantlyrotating shaft N, operates the type-lever 101 in known manner. The column totalizers are provided with engaging members 161, Fig. 3, projecting into the path of a coupling member 163, Fig. 1, connected to a pair of cross totalizers 108, 109. which jump back to normal position under spring action after actuation. Certain of the column totalizers carry projections 121, Figs. 1 and 4, adapted to co-operate with one or other of the hooks 119, 120 of a pair of levers 117, 118 of the " clear sign '' impression mechanism. The levers 117, 118 are pivotally connected to levers 124, 125 that co-operate with levers 130, 131 formed with U-shaped rails 133, 135 in which engage rollers on slidable members 139, 140. These slides are pivotally connected to levers 143, 144 formed with rails 147, 148, having prongs adapted to coact with the driving wheels of the cross totalizers. The rails 133, 135 co-operate with a lever 151, 152 pivoted on the shaft 132 and connected by a link 155 to a pin 156 on the " clear sign " type impression operating lever 95. During displacement of the carriage on manipulation of its release lever this mechanism is disengaged by lowering the levers 117, 118, by reason of their connection with a lever 113 on a shaft 110, the lever being operated by links and arms associated with the release lever. Each column totalizer is provided with a pair of setting-plates 168a, 169a, Fig. 7, adjustable by knobs 170a, 171 to any one of three positions for effecting the control of the cross totalizers for addition, subtraction, or non-actuation. The plates cooperate respectively with levers 172, 173 connected by links 179, 188 to arms 181, 189 engaging grooves in the slidable pinions of a pair of reversing mechanisms with a central idle position so that the driving pinions 184, 193 of the cross totalizers 108, 109 are driven in one or other direction or remain idle depending on the setting of the plates 168a, 169a. In accordance with the present invention a paper carriage 199 is supported on the totalizer carriage 4 ; the paper carriage comprises a front U-shaped member 198 with a roller 200 bearing on a rail 197 on the carriage 4, and side-plates 199a, 199b with rollers 209, 251 running on a rail 211, the whole being connected by a cross-bar 204, Fig. 3. The roller 209, Fig. 8, is mounted on a bracket 206 to which is attached a draw band 216 the other end of which is secured to a spring in a casing 217, Fig. 2, on the totalizer carriage 4. To a lug on the bracket 206 is pivoted a lever 227 having a tooth 228 adapted to coact with teeth 229 on a rack 230 adjustably mounted on the totalizer carriage 4. A toothed projection 236 is secured to the lever 227 for co-operation with a rack 236a secured to the fixed framework and provided with triangular teeth 236b .. 236e. During a movement of the carriages to the left if the tooth 236 engages one of the teeth the tooth 228 is disengaged from one of the teeth 229 and the paper carriage is displaced under spring action until the tooth 228 engages the next tooth 229. When it is desired to prevent this relative movement the rack 236a is vertically displaced by rocking an arm 236h, Fig. 5, in engagement therewith by a linkage 236i, 236k, and a pin 236m spring pressed into a notch 236o in the framework. Normally the pin rests in a second notch 236n. Independent adjustment of the paper carriage is effected by depressing a pivoted release lever 238 a lug 240 on which is adapted to free the tooth 228 from engagement with the teeth of the rack 230. The other roller 251, Fig. 9, which supports the paper carriage on the rail 211 is mounted on a bracket 249 to which is pivoted a lever 257. One end of the lever carries a roller 260 engaging a cam plate 262 on the rear frame and its other end carries a spring-pressed pawl 265 engaging a ratchet wheel 268 on the platen roller 102 for the purpose of effecting line spacing. The pawl 265 is extended upwardly and is formed with a knob 265b whereby the pawl may be disengaged to enable the platen to be freely rotated by the knob 102a, Fig. 2. When the carriage return key is depressed the totalizer carriage moves to the right, Fig. 2, and during this movement the paper carriage jumps to the right as described above, the movement continuing until the paper carriage reaches a fixed stop 281, Fig. 5, whereafter the totalizer carriage alone continues the movement to the position shown in Fig. 2. A method of operating the machine in filling up a tax return schedule is described in the Specification. Different forms of schedule may be utilized by the substitution of differently formed racks 230, 236a, or the racks may be plain and fitted with jockey teeth. Specification 379,128 is referred to.