Patent GB-551311-A (GB)
Abstract: 551,311. Calculating machines. AKTIEBOLAGET FACIT. June 9, 1941, No. 7275. Convention date, June 17, 1940..[Class 106 (i)] A calculating machine having an actuator (such as a pin wheel rotor) rotatable in two directions, is characterized by a control lever 201 manually settable to three positions and latched in the position set by means of a latching member 209, said lever setting the machine to full-automatic division and to multiplication with tabulation to the right or to the left, respectively, separate motor keys 1, 2 being provided for starting the machine. Positions of control lever and disconnecting lever.-The chief control lever 201 has three positions a, b, c, disconnecting lever 202 two positions, right and left. The main operations with automatic tabulation are (1) with lever 201 in position a, multiplication in the denomination concerned proceeds while the operator holds down multiplication key 1, and on release of this key, the actuator is tabulated one step to the left. (2) with lever 201 in position b and disconnecting lever 202 in right-hand position, when the operator releases the multiplication key, automatic tabulation to the right takes place. (3) with lever 201 in position b and lever 202 in left position, when the multiplication key is released, no automatic tabulation takes place (although manual tabulation by keys 197,199 can be effected). (4) with lever 201 in position c a momentary depression of the division key causes full-automatic division with the actuator rotating alternatery in positive and negative directions, automatic tabulation one step to the right taking place at each change of direction. Control of revolutions counter.-Arm 213 of chief control lever 201 engages a cam slot in lever 215, Fig. 3, so as to move lever 215 into its clockwise position for multiplication, positions a and b, and into countei-clockwise position for division, position c. In the latter position, a movement of the tens transfer lever 100 of the highest denomination of the results register, which occurs at over-subtraction or over-addition, rocks spring-pressed lever 237 which rocks lever 102 to stop the machine as described in Specification 413,205. Lever 215, acting through pin 233 and lever 229, positions lever 225 which through a cam-and-groove action moves shaft 218, which carries quotient tooth 219 for operating the revolutions counter. lonvitudinallv. so that through suitable gearing shaft 218 and therefore the revolutions counter are made to rotate in the same or opposite direction as the actuator 4, according to whether lever 201 is set to multiplication or division. Lever 229 may be moved by knob 234 to set shaft 218 to negative position, even though lever 201 is in b position, for " minus multiplication," i.e. calculating ab-cd, or to positive position even. though lever 201 is in c position, for " minus division," i.e. calculating a/b-c/d. Any subsequent movement of lever 201 from b to c position or viceversa returns the central notch to engagement with pin 233. Tabulation.-Step-by-step tabulation to the right is effected in known manner by key 197 which acts directly on pawl 160, 164, Fig. 14 (not shown), which moves a rack secured to the actuator carriage. Lever 254 also acts directly on this pawl and is actuated in automatic tabulation to the right. In a similar manner, key 199 and lever 255 tabulate step-by-step to the left. Key 198 tabulates the actuator to extreme left position for tabulating factors of division. Automatic tabutation.-Lever 201, through a pin-and-slot connection, positions slide 241, on an extension of which disconnecting lever 202 is pivoted. Swing lever 247, adapted to be rocked whenever the actuator is stopped, has pivoted thereto a hook lever 249 adapted to engage projection 257 on step-tabulating plate 250, spring- urged to the right. With lever 201 in position a, slide 241 pushes plate 250 to the left to engage tabulating lever 255 so that when lever 247 rocks, tabulation takes place to the left. With lever 201 in position b and lever 202 in its normal, right-hand position, plate 250 engages tabulating lever 254 for tabulation to the right, but if lever 202 is in its left, operative position, it engages pin 251 to hold plate 250 in its central position to prevent automatic tabulation. With lever 201 in position c, tabulation takes place to the right. With lever 201 set for tabulation to the right and the actuator in exreme right position, member 263 presses member 259 to the right and hence hook 249 into its inoperative position to prevent tabulation, but if the actuator is not in extreme right position, member 259 positions hook 249 into operative position, and tabulation takes place at the next swing of lever 247. Movement of hook 249 into or out of operative position can be simultaneous with the movement of lever 237, this being permitted by slot 258. In tabulation to the left, hook 249 is always in operative position, and the actuator carriage is stopped in extreme left by a stationary stop. Controlling pawl 275-Pawl 265, pivoted on lever 247, is spring-urged into the path of driving lever 267 but is normally locked by a projection lever 271. Lever 274, pivoted to lever 247, carries pawl 275 also spring-urged into the path of driving lever 267 but normally locked by lever 247. Driving lever 267, Fig. 2, is rocked to and fro by motor-driven eccentric 281. When lever 201 is in a or b position, slide 241 positions lever 283, Fig. 1, also to lock pawl 275. Lever 274 carries pin 285 engaging slot 286, Fig. 9 (not shown), in control plate 287 (spring-connected to lever 274), which has shoulders 289 moved into engagement with either of arms 290, 291 integral with keys 1, 2 when the plate is rocked to right or left under the control of pin 292 and a slot in the bent portion 293 of reversal lever 294. Minus locking member 299 has a pin, slot and spring connection with member 259, and when in right hand position, with reversal lever 294 in positive position, locks pawl 275 while abutting against bent portion 293 of lever 294. In any other position, pawl 275 is free from member 299. When the actuator is moved to the left, member 299 becomes free from portion 293, no matter what the position of lever 294. Multiplication and division keys.-When either of keys 1, 2 is depressed, it is locked down by pawl 304 or 305, and as described below, the actuator begins to rotate. Cam disc 308 on the actuator shaft rocks releasing arm 310, which at its lower end has a pin-and-slot connection with small slide 311, which is in counter-clockwise position under the action of slide 241 on projection 318, when lever 201 is set for multiplication, so that slide 311 strikes a pin on the locking-down pawl to restore the key under its own spring action. If, however, lever 201 is set for division, slide 311 is in its clockwise position and performs an idle movement. In this case, when the actuator is stopped as described in Specification 413,205, it rocks arm 57 which rocks tabulating impulse lever 322, the lower end of which releases the locking-down pawl. Hook 271, Fig. 2, has a striking point 328 pressing against a pin on impulse lever 322, and when hook 271 is rocked clockwise it also actuates hook 326 to rock contact lever 331 to start the electric motor. The top end of reversal lever 294, Figs. 1, 2, 6, referred to under the heading " Controlling pawl 275," comprises a fork 338, Fig. 6, enclosing one of two pins 38 which, as described in Specification 413,205, can assume three positions, +, O, or -. When neither of keys. 1, 2 is depressed, there is no driving connection between pin 38 and arm 29. If one of keys 1, 2 is depressed, as described below, one of slides 36, 37 is raised and arm 29 moves the slide and pin 38 to mover lever 294 to + or - position, where it is latched by spring 340 and notched arm 339. Plate 287 is thereby positioned and held, and when, subsequently, it is moved in direction F, Fig. 1, it pulls down the division or multiplication key, according to whether the multiplication or the division key was previously depressed. Addition and subtraction keys: + and - keys, 203, 204 act on levers 344, 345, Figs. 10, 11, carrying hooks 349, 350 which engage respectively under keys 1, 2 which are depressed by projections 354, 355 when either of keys 203, 204 is depressed, so that pawls 304, 305 act as locking pawls for keys 203, 204. Each lever 344, 345 has a projection which actuates hook 358. Keys . 1 and 2 act respectively on slides 363, 364 which actuate hooks 369, 370 to raise spring-pressed slides 36, 37 to set the actuator for positive or negative rotation as described under the heading, " Multiplication and division keys." The upper end of release arm 310 is adapted to rock lever 375, a projection on the lower end of which engages hook 358 when this is lowered by depression of either of keys 203, 204, to move hook 358 and therefore slide 380 in direction H to actuate impulse lever 322 via pin 383 to release hook 304 or 305, and via pin 384 to release hook 369 or 370. Toothed wheel 385 is permanently connected to the motor shaft and can be coupled under the action of a cam and lever 392 to a gear 388, Fig. 12 (not shown) driving a clearing cam. In its operative position, slide 380 is locked by pawl 395, released by pin 397 during clearing operations. Lever 392 is connected to link 398 rockable on arm 400 which has a projection 403, which when the actuator is at rest can enter slot 404 of disc 405 on the actuator shaft. This can be done through the clearing key 406. During clearing operations, electric contact 334 is maintained by a pin on slide 380 rocking lever 411 and therefore lever 331. Operation.-Addition and subtraction are independent of the setting of levers 201, 202. Addition and subtraction.-The item is set into the actuator 4 by means of the item keys 200 in the usual manner. Depression of + key 20