Patent GB-753841-A (GB)
Abstract: 753,841. Calculating-apparatus; transfer mechanism. INDUSTRIA CALCOLATRICI SCRIVENTI G. CARNACINA & C., SOC. PER AZIONI. Feb. 23, 1953 [Feb. 23, 1952] No. 5002/53. Class 106 (1). Multiplication apparatus comprises an adding machine having a keyboard and a totalizer, and a control mechanism constructed as a unit which is securable to the adding machine to cause the adding machine automatically to perform multiplication by repeated additions with column-shifts of the multiplicand in accordance with the digits of a pre-set multiplier. The adding machine shown is mounted on a base A, Fig. 35, and is a ten-key machine having a laterally movable pin-carriage 31 on which the multiplicand is set. The multiplication control mechanism is mounted in a base B secured below the base A and includes a laterallymovable multiplier carriage G. Driving mechanism. On depression of a starting key 1003, Fig. 51, coupled links 905, 917 are moved to the left. A latch 959 pivoted to the link 917 releases for engagement a onerevolution main clutch and moves a slide 961 to close contacts 968, 969 in the motor circuit. The slide 961 is controlled by the driven clutch member 966 so as to open the circuit after the single revolution. A link 925 is pivoted at 973 to the member 966 and at 924 to a cam-plate 285, Fig. 24. A sector 930 co-operates with the pin 924 and latch 959 to prevent a further cycle on re-depression of the starting key before the end of the cycle. An auxiliary clutch and the above-mentioned main clutch are controlled during multiplication and division as described below. Setting mechanism. The ten keys are arranged in three columns and each stem 10, Fig. 2, has an extension which, when the key is operated, engages an arm 14 of a corresponding lever 15. A further arm of the lever engages a slide 19 which rocks a corresponding arm 21 against a spring 24 to project the appropriate one of a column of pins 32 in a pin-carriage 31. Each pin 32, Fig. 6, has a hump 35 which cooperates with a hump in a spring 34. When any arm 21 is rocked, a pin, Fig. 7 (not shown), depending from one of a pair of escapement levers co-operating with a set of pins on the pincarriage is engaged to step-shift the carriage to enable the next digit to be entered. Differential actuators. Pivoted on a shaft 108, Fig. 8, are differential beams 110, having arms 111, 112, each of which is urged to follow a rod 122 by a spring y acting on an arm 121 pivoted to the beam. The rod 122 is rocked about the shaft 108 to allow the beams to move differentially into engagement with the set pins of the pin-carriage 31 further movement of the rod 122 camming the arms 121 into engagement with teeth formed in plates 77. In denominations above that of the highest significant digit, the beams engage a plate 131 carried by the pin-carriage. Toothed segments 109 which actuate the totalizer, are normally locked to the differential beams by arms 115 pivoted to the segments and engaging steps 116 in the beams under the action of springs 118. Printing mechanism. Zero suppression. Pivoted to each differential beam 112, Fig. 8, and coupled therewith by a spring 135 is a typebar 133 guided for vertical movement in a plate 134. When the bars are in differential positions cross-bars 166, 167 are lowered under cam control and the bar 166 depresses pendants 155 to rock latches 151 and so release cocked hammers 138 to the action of springs 170. The selected type and an ink-ribbon (not shown) are thus impressed against a roller platen 141. If a differential beam 112 remains in its zero position, a tail 163 thereof acts through a lever 159 to hold the corresponding pendant 155 out of the path of the cross-bar 166. After printing, the hammers are again locked by the restoration of the cross-bar 167, and the re-engagement of the latches 151. Each latch 151 carries an offset plate 171 arranged over the pendant 155 of the next lower order. Thus all the hammers in orders below that of the highest significant figure are operated to cause ciphers to be printed where necessary. Totalizer engagement mechanism. The totalizer comprises, for each order, a pair of intermeshing pinions 190, 191, Figs. 8 and 15, on shafts 192, 193, mounted between plates 198, 198<SP>1</SP>. Studs 201, 201<SP>1</SP> in the plates 198, 198<SP>1</SP> are engaged in slots 209, Fig. 16, in plates 210, 210<SP>1</SP> pivoted in the machine frame. A stud 204 in each plate 198 engages in a notch 213 in the corresponding plate 210. The studs 201 are normally held in the upper position by springs 222, Fig. 19, acting on arms 207 pivoted to links 205 supporting the studs 201. The totalizer frame is rocked to position either set of pinions for engagement with the actuators by a pair of arms 202, the bifurcated ends of which embrace the studs 204 and receive the studs 201. During addition and subtraction, a cam-plate 236 laterally spaced from but secured to a plate 127 on the mainshaft engages under a roller 239 in a lever 229 and initially rocks this lever idly counter-clockwise. When the plate 127 reaches the end of its counter-clockwise movement, a member 247 held against clockwise rotation by a stop 249 and entering between the plates 236 and 127 rocks an arm 241 pivoted on the plate 127 against a spring to allow a spring 231 to restore the arm 229. Thus, at the beginning of the second part of the cycle, the plate 236 cams the roller 239 downwardly. A stud 228 in the lever 229 thus rocks a slide 225 about its pivot 208. A hook formed on this slide is normally engaged over a stud 223 in the arm 207 so that this arm is depressed to engage the totalizer through the links 205. The totalizer wheels are locked against rotation when not engaged with the actuators by a rod 215, Fig. 17, carried by a pair of slides 216 mounted on the totalizer shafts 192, 193. When the totalizer is set as shown for addition, a lever 218 is rocked by an arm 221 fast with the arm 207 when the totalizer is engaged to move the slide 216 to the right to disengage the rod 215. During subtraction, an arm 219 moves the slide in a similar manner. Transfer mechanism. At transfer, a tooth on the totalizer pinion engages a projection 256, Fig. 13 (addition), or 2561 (subtraction) on an arm 252. A latch 258 holds the arm in depressed position. Then, as the toothed segment 109 of next higher order completes its movement, the lever 115 pivoted thereon is cammed counter-clockwise by a pin 260 in the arm 252. The end of the lever 115 is thus disengaged from the step 116, Fig. 8, of the differential beam 112 and the segment 109 is moved through a further step by the spring 118 acting on the lever 115. A pin in the segment disengages the latch 258. Early in the next operation, a rod 265 carried by camcontrolled arms 266 restores the operated levers 115 on to the steps 116. Fugitive-one. The highest and lowest orders have arms similar to the transfer arms 252 and connected together so that when the amount accumulated passes zero, the lowest order arm co-operates with mechanism similar to the transfer mechanism to enter one in that order, additively or subtractively according to whether addition or subtraction is being performed. Subtraction. On depression of a subtraction key, an arm 283, Fig. 24, on a shaft 282 is rocked counter-clockwise. A stud 284 in the arm 283 engages in a slot in an arm 289 pivoted to an arm 287, raised by a cam 285 during each cycle. Thus in subtraction, the arm 289 moves to the left of a fixed guide 294 and a shoulder 293 lifts a lug 292 formed on the end of the lever 202, Fig. 19, to rock the totalizer frame to the subtraction position. The subtraction key may be latched in its operated position. Subtotal-taking. If no amount keys have been actuated when an operation is initiated, a subtotal will be taken. In entry operations, step-shifting of the pin-carriage releases a latch which engages over a stud 306, Figs. 19 and 25, in the slide 225 to prevent leftward movement thereof. However, in a subtotal operation, an arm 296 is rocked by a cam 127 and an arm 301 is able to follow the movement by means of a spring 300, and through a link 302 and arm 304 moves the slide 225 to the left. The slide 225 rocks the zero stop-plate 131 carried by the pincarriage 31 to ineffective position. Moreover a step 234 of the slide 225 is moved beneath a stud 232 in the lever 229 so that when the latter is initially rocked counter-clockwise by the cam-plate 236, the slide 225 is depressed, its hook depressing also the arm 207 to engage the totalizer. The totalizer wheels are thus driven to their zero positions in which the transfer teeth abut the projections on the transfer levers. A finger of the arm 301 maintains the member 247 in an ineffective position, so that the arm 241 is not rocked relative to the plate 127. Consequently the roller 239 remains on the upper surface of the cam plate 236 during the second half of the cycle and the totalizer remains engaged. Total-taking. Depression of a total key rocks an arm which moves the slide 225, Figs. 19 and 25, to the left so that, as described, the totalizer is zeroized during the first half of the cycle. However, the arm also blocks the arm 304 so that the member 247 is not rocked but remains effective to rock the arm 241, Fig. 19, to allow the roller 239 to pass beneath the camplate 236 and the slide 225 to rock upwardly to disengage the totalizer in the middle of the cycle. Negative totals and sub-totals. If the total is negative, the subtract wheels of the totalizer are automatically engaged in total or subtotal operations. When the total goes negative, the additional movement of the units order segment 109, Fig. 28, to enter the fugitive one causes the pivot 113 therein to rock a lever 333 and a slide 331 mounted thereon. At this time, the slide is held in its right-hand position by an arm 328 engaged by the totalizer control lever 202 which is in its subtract position. Thus a pi