Patent GB-435286-A (GB)
Abstract: 435,286. Calculating-apparatus. JACKSON, L. MELLERSH-, 28, Southampton Buildings, Chancery Lane, London.-(Felt & Tarrant Manufacturing Co.; 1735, North Paulina Street, Chicago, U.S.A.) June 19, 1934, No. 18129. [Class 106 (i)] In a machine with a laterally movable totalizing counter carriage a power driven actuating mechanism is provided which is optionally operable under key response for addition and subtraction and under key response, after previously setting up another factor, for multiplication and division. Adding and subtracting apparatus.-The machine has a plurality of key banks with keys 64, Figs. 5 and 6, each bearing a digit and its complementary number for adding and subtracting operations respectively. The stems of the keys of each bank are adapted to cooperate with a differential stop bar 88 connected to a toothed sector 97 loose on a shaft 98. To the sector of each denomination is attached a link 95 pivoted at its forward end to an arm of a friction device 103 on a shaft 104. Another arm 119 of the friction device is connected by a link 121 to an arm 123 carrying an arrangement of spring connected arms 125, 127. The arm 125 has a projection 152 co-operating with a lip 153 on a link 145 that is connected to levers carrying a parallel motion bar 138. The arm 127 has a projection 129 arranged to co-operate with a lug 155 of a member 154 pivoted to the bar 138. Upon depression of a key 64 the corresponding sector 97 is differentially positioned in a clockwise direction, Fig. 5, and extends the spring 105 attached to the link 121 ; at the same time the bar 138 is depressed and rocks the member 154 to depress the arm 127. The arm 125 is held up by the engagement of its projection 152 with the lip 153 of the link 145 to allow time for the sector to take up its position, and as the link 145 moves towards the front of the machine the projection is freed and the arm 125 falls so that its hooked end 126 moves into engagement with a toothed wheel 118 on the shaft 117. There is a toothed wheel 118 for each denomination and these wheels are constantly rotated by the shaft 117 which is driven by gearing from the driving motor 108. The wheel 118 imparts a rearward movement of constant extent to the arm 125 and attached link 121, the arm being freed at the end of the movement by projections 136, 137, Fig. 7, on the arm 125 co-operating with the teeth of the wheel to disconnect it therefrom. The power is stored in the spring 105 and as the arm 125 is freed the spring 105 restores the parts and the differentially set sector 97 imparts a corresponding movement through a ratchet mechanism 81 and transmission gearing to the totalizer pinions 77. A key locking bar 147 with projections 149 is operated to cause a projection to enter a hole in the stem of the operated key and hold it depressed. The bar 138 also is held depressed by the engagement of a lug 162 on the link 145 with a latch 163 until near the end of the rearward movement of the link 121 when a pin 165 thereon engages an arm 166 of the latch 163 so as to free the link 145. If a key is held depressed re-engagement of the latch 163 is prevented by the action of an arm 167 of the member 154 which is swung in the clockwise direction, Fig. 6, by the lug 129 engaging the lug 155 on the member. Multiplying and dividing apparatus. In addition to the multiple key banks above described the machine is provided with a bank of multiplier keys 231, Figs. 9 and 11. Normally a key 181, Fig. 15, is depressed for adding and subtracting operations but for multiplication and division a key 182 is depressed for the purpose of utilising the key banks 64 for presetting the multiplicand. Depression of the key 182 rocks a three armed lever 189 operatively connected to shafts 201, 211 which are thereby rocked. The shaft 201 is slotted adjacent each of the members 154 and on its rocking movement displaces the members 154 to render them inoperative to depress the arms 127. The shaft 211 is also slotted and its rocking movement sets latch members 207, Fig. 5, into co-operative relationship with lugs 205 on the forward ends of the links 145 to hold the links in the position they assume on depression of the keys 64 representing the multiplicand. In this operation each lever 127 is brought under the influence of a corresponding hooked arm 224, Fig. 6, mounted on an arm 223 on a shaft 222. Each arm 224 cooperates with a pin 226 on its lever 127 and the shaft 222 is adapted to be oscillated a number of times determined by the key depressed in the multiplier bank 231. The keys 231 are associated with a parallel motion bar 234, a key locking bar 241 and a differential stop bar 248 similar to those for the keys 64. The stop bar 248 is connected by a link 246 to an arm 244 of a sector 243 with ratchet teeth loosely mounted on the shaft 98. The sector 243 is adapted to be returned to normal position one step for each operation of the shaft 222. To the shaft is attached an arm 273 to which is pivoted a link 275 supported at its other end in an arm 277 carrying a hooked arm 294 and a co-operating arm 298. The hooked end of the arm 294 is adapted to be engaged by a plate 292 on an arm 289 that is rocked by means of a connecting rod 287, Fig. 13, and an eccentric pin 286 on a gear driven from the shaft 117. Upon depression of a key 231 a latch dog 259 releases a latch 254 to free the differential stop bar 248 and the lower element of the bar 234 rocks an arm 304 to depress the arm 298. Arm 294 does not move until the sector 243 has taken up its setting by reason of the engagement of a lug 311 on the arm 294 with a lug 312, Fig. 11a,on a lever 313 that carries a dog 317 that co-operates with a stud 247 on the differential bar 248. When the bar 248 is moved the dog 317 is rocked and a lug 321 thereon moves into the path of an arm of a lever 319 rocked by the plate 292. When this occurs the lugs 311, 312 are released, whereupon the arm 294 falls and is subsequently reciprocated by the plate 292. This movement is transmitted by the link 275 and a link 326 to an arm 324 pivotally mounted on the shaft 98 and carrying a pawl 327 coacting with the ratchet teeth of the sector 243, the pawl being normally held in the disengaged position by a cam or masking plate 333. A detent pawl 334 and a latch 336 are provided, the latch holding the pawl out of operative engagement with the sector at the end of a calculating operation. The depressed key is locked against return movement until the desired number of repeated additions has been effected. For this purpose the bar 234 has a latch 345 which on depression of the bar by the key moves into engagement with a projection on a lock plate 346. At the end of the cycles of operation a pin 348 on the differential stop bar 248 engages the tail end of the latch 345 to free the bar 234 and depressed key. At the same time the latch 259 is operated by the tail of the latch 254 to free the lever 304 which rises and permits the hooked arm 294 to follow and move it out of the path of the plate 292. Keyboard interlocks.-The totalizer carriage may be shifted manually or mechanically in a known manner. The raising of the carriage to detrain the transmission gears effects the rocking of a lever 369, Fig. 13, which is operatively connected to a shaft 373 so as to rock the shaft and move latches 378 thereon, Fig. 11, into engagement with projections 381 on the rear ends of the bars 138, 234, thereby locking the bars against operation. This locks the keys that have been depressed and prevents the depression of the other keys. Revolutions or quotients counter. Counter wheels 382, Fig. 6, carry ratchet gears 383 adapted to be actuated by a pawl 388 on a lever 386 pivoted on the shaft 98 and operatively connected to an arm 392 on the shaft 222. Errors, correcting. Each bank of the key banks 64 has a reset key 265, Fig. 5, adapted on depression to rock a bell crank 269, a pin 461 on which engages an arm 462 of the detent 207 so that the detent is rocked to free the latch 205 and permit the parts to return to normal. To clear the entire keyboard a clear key 463, Fig. 13, is provided. Depression of this key rocks a lever 467 which is operatively connected to the shaft 211 so as to rock it and free the detents 207. Another arm of the lever 467 rocks a shaft 478 on which is mounted arms 481, Fig. 5, one for each denomination. These arms 481 co-operate with the tails of latches 393 to render them inoperative and thus prevent locking of the keyboard.