Patent GB-518840-A (GB)
Abstract: 518,840. Calculating-apparatus. MONROE CALCULATING MACHINE CO. Sept. 6. 1938, No. 26071. Convention date, Sept. 18, 1937. [Class 106 (i)] A listing calculating machine is provided with multiplying mechanism and comprises means for entering both factors in storage elements, a key for initiating the multiplying operation, means for controlling the restoration or advance of the multiplier elements in denominational order to cause the multiplicant to be transmitted to a selected totalizer by repeated addition of the multiplier digit or its complementary value, and means for printing both factors and for automatically printing the final product. The invention is shown applied to the type of machine as described in Specifications 293,080, [Class 106 (i)], 389,630, 389,632 and 406,152. Amounts entered on the keyboard 215, Fig. 2, are accumulated in one or more totalizers 473 either additively or subtractively by the actuating segments 610 carrying the differential bars 615. The machine is provided with the usual type bars 611 hammer impression mechanism, and platen carriage the movement of which is controlled by the usual notched tabulating bar 1, Fig. 6, and the usual lever and clutch mechanism. The selection of the totalizer and the kind of operation is under the control of a perforated tubular bar 82 and of the feelers that regulate the movement of the sectors 105 which set the cams on the totalizer shafts in the known manner for selectively engaging the totalizers with the actuators through the cams 316, 320, Fig. 8, on the main shaft, the rocker 325, 326 and the operating plates 419. The total taking mechanism operates also in the known manner. Multiplying apparatus.-The complete factors are set up on the keyboard the multiplicand to the right and the muliplier to the left of an indicating line on the keyboard. A multiplying key 201, Fig. 7, is then depressed and by a link connection 202 depresses the operation control key 138 to release a hook 148 from the clutch lever 150 to initiate a machine cycle by closing contacts 64 in the motor circuit and rendering the one revolution clutch 155 effective as described in Specification 406,152 referred to above. During this preliminary cycle the values set up will be transmitted to multiplicand and multiplier storage members 203 and 203a, Figs. 2 and 20 and the amounts will be printed. The storage members are loosely mounted on a shaft 204 in a transversely movable factor carriage 205. The multiplicand storage members 203 are locked in a set position by a bail 218 on a shaft 216 carrying a crank arm 213, Fig. 16, in operative relation with a lever 209 adapted to be rocked by a cam 211, Fig. 7, on the operating arm 316. In the case of the multiplier storage members 203a flexible locating means are provided to enable the members to be stepped back or forward to a normal or zero position. For this purpose the shaft 216 has a series of arms 219 each with a pawl 224 having a projection 225 normally engaging a notch in a corresponding arm 228 loose on the shaft 216. A rod 230 passes through the arms 219 and bell crank 213 to bring the projections 225 into engagement with the serrations on the storage members. When the multiplying key is depresed a pin 234, Fig. 16, thereon rocks a lever 232 and causes a finger 236, pivoted on the lever 209, to move to a position underlying a projection 241 on a rocker 239 which is operatively connected to an arm 247 on the rod 230. The rocking movement imparted to the rod 230 displaces the arms 228 to disengage the projections 225 of the pawls 224 so that they are moved yieldingly into engagement with the storage members. Near the end of the forward stroke the impression hammers 715 are tripped to print the two factors. A special zero control is provided between the multiplicand and multiplier sections of the keyboard. For this purpose the usual overlapping lug 703 is replaced by a latch 332. When the multiplying key 201 is depressed the link 202 rocks a shaft 329, Figs. 2 and 7, to displace the latch 332 to split the impression mechanism. Factor carriage mechanism.-The carriage 205 is normally held in right hand column position by a pivoted rack 254, Fig. 26 and a roller 253 on the right hand plate of the carriage. When the multiplying key is depressed the pin 234 rocks a lever 257, Fig. 14 and displaces the projection 259 of a pawl 258 into the path of movement of a latch 260. The latch 260 is pivoted to a link 262 attached to an arm of a shaft 266 and to the operating cam plate 316. The latch in its movement by-passes the pawl 258 and on the return stroke is rocked to free a second latch 268 pivoted on the link 262 to permit a roller 270 to engage and rock a control plate 272. The control plate, through a link 275, lowers the rack 254 whereupon the carriage is free to move under spring action until arrested by the engagement of a pawl 277, Fig. 27, with the face of the lowest set order of the storage elements 203a, or if that is not displaced the pawl 277 is arrested by a projection 299 on a supplementary carriage 280 on which the pawl 277 is mounted. The carriage 280 is provided with a rack 283, Fig. 26, engaging a pinion 282 on the factor carriage 205 and in mesh with a fixed rack 284. The pawl 277 is normally held away from the lowest storage member by a latch 285 which is released, to free the pawl for action, by a lever 294, Fig. 25, operated by means associated with the shaft 216 and arms 228. At the same time a latch 303 is freed from one of the notches 306 of a slide 307 and the carriage moves. Upon release of the slide 307 it moves under spring action to rock a latch 310, Fig. 26 to cause it to overlie a finger 314 operatively connected to the control plate 272 so as to hold it in rack disengaging position during the shifting operation. Clutch control means for multiplying cycles.- The clutch lever 150 having been displaced to initiate a machine cycle when the control plate 272 is displaced a link 339 is moved to put a latch 148a into contact with the upper surface of the clutch lever 150. At the end of the cycle the lever 150 is returned by a projection 370 on the clutch and the lever is held by the latch 148a. Upon restoration of the control plate 272 after engagement of the pawl with the storage member, the hook 148a is freed from the lever 150, the lever 150 is held however by a latch until completion of the plates carriage shift whereupon another cycle is initiated. Operating means for storage members.-Each member 203a is provided with a U-shaped switch member 363, Figs. 20, 21 and 22 which is settable to one or other of two positions depending on the value of the multiplier digit, viz., 0 to 4 or 5 to 9. In the first case when the shaft 216 is rocked an arm 219 thereon displaces a finger 374 so that its pin 372 will rock the switch member 363 to bring a surface 369 on one arm into relation with a projection 368 of a feeler 365 and the surfaces 394, 395 on the other arm into the position shown in Fig. 21. In this position the feeler 365 which is supported by a bail 367, will be prevented from moving. On the shaft 266, Fig. 18, is a block member 383 normally engaging a projection on an arm 385 connected by a link 386 with the usual rocker member 325, Figs. 7 and 8, that determines the time of engagement of the selected totalizer with the actuating racks. The operation of the link 262, through a pawl 348, Fig. 17, rocks a bail 346 which, by means of a member 345 overlying the bail and pivoted to an arm or multiplier counting  finger 344 slidably mounted with the carriage 280, causes a projection 362 on a pawl 360 to engage the serrated edge of the storage member and drive it one step back towards the zero position. in denominations in which the digits 5 to 9 are set up the movement of the finger 374 is blocked by a shoe 399 on the storage member so that the switch member 363 will be held in raised position with the cam surface 395 opposite the projection on the pawl 360. In this position the storage member will be advanced in anticlockwise direction by the pawl 360 until the surface 364 of the storage member is below the pawl 277 whereon the control plate 272 is operative to shift the carriage. In the raised position the surface 369 also is out of the path of movement of a projection on the arm 365 so that when the bail 367 is rocked the block lever 383 will be rocked to free the arm 385. Clockwise movement of the arm 385, through a link 386, rocks the control plate 326 to set the rocker 325 for a subtraction operation. This subtractive multiplying action necessitates the addition of a unit to the next higher denominational storage element 203a. This is effected under the control of a projection 225 of a pawl 224 and a surface 400 of the appropriate switch member. Control of parts during multiplying operations. -The keyboard clearing mechanism and the platen shift mechanism are rendered inoperative by the link 202 associated with the multiplying key rocking a shaft 405, Figs. 7 and 8, to move a slide 416 rearwardly and rock a hook 418 out of co-operative relation with a pin 263 on an arm of the restoring bail 227. At the same time an arm 408 on the shaft 405 is moved below a shoulder 411 on the arm 171 to hold it in raised position to render shift mechanism inoperative. The differential stop bars 615 for those columns related to the multiplicand must be released during the multiplying cycles. For this purpose the control plate 272 co-operates with a crank arm 426 and lock 429 so arranged that when the arm 426 is moved beyond normal position a bail 423, Fig. 2, engages projections on the slides 191 which operates to free the zero stop latches 214. The impression mechanism is ineffective during multiplying cycles as the arm 408 is operatively connected to a bail 434. Fig. 6, which is rocked downwardly to engage the hook end of the bail 707 to prevent hammer movement. Restoring factor carriage and setting pla