Patent GB-401904-A (GB)
Abstract: 401,904. Calculating - apparatus. TRIGGS, W. W., 57, Lincoln's Inn Fields, London.-(Sundstrand Corporation; 100, West 10th Street, Wilmington, Delaware, U.S.A.) Dec. 17, 1932, No. 35873. [Class 106 (i).] Adding and subtracting apparatus.-A machine for use in book-keeping and analogous work is provided with a main totalizer, a plurality of auxiliary totalizers, a transfer mechanism common to all the auxiliary totalizers, and means for selectively moving an auxiliary totalizer into engage - ment with its differential actuating racks either alone or jointly with the main totaliser and its actuators. The selection may be effected manually or automatically under the control of the paper carriage. By this means items can be accumulated in, and totals or sub-totals taken from, any one of the auxiliary totalizers in any carriage position, and items from various carriage positions can be accumulated in any auxiliary totalizer. The invention is shown applied to a Sundstrand type of machine wherein depression of a key sets a stop in a stop field in the path of movement of a pin 21, Fig. 1, mounted on a slide 22 and engaging a bar 20 pivoted to the corresponding type bar 1. Each type bar is formed with an extension 7 which supports a pair of spring controlled racks 32, 33, adapted to control the actuation of the main totalizer pinions 33 for addition or subtraction respectively. The movement of the type bars 1 is derived from a main shaft 15 on which is mounted arms 13 bearing rollers 16 adapted to engage the forked cam ends 17a, b, c, of a pair of levers 18. The levers 18 are pivoted on an axis 11 and are connected by a rod 19 which overlies the forward arms of spring controlled levers 10 each connected to a type bar. The rear arms of the levers 10 have pin and slot connection with spring controlled levers 227 that cooperate with the actuating racks 226 of the auxiliary totalizers 225. Main totalizer engaging mechanism. The main totalizer pinions 30 are moved into and out of engagement by means of links 37, Fig. 5, operatively connected to a cam plate 46 adapted to be rocked by the cooperation of a pin 53 or 54 with corresponding notches 51, 52 of a depending link 50. The pin 53 or 54 is operative for additive or subtractive items respectively. The link 50 is connected by a rocker arm 55 to a notched link 57 normally engaging a pin 59 on a lever 60 having a pin and slot connection with an arm 62. The lever 60 has a pin 71 adapted to cooperate with a spring controlled pawl 66 on an arm 64 secured to the main shaft 15. In operation the upward movement of the arm 64 through the pawl 66 rocks the lever 60 counterclockwise so as to move the totalizer to neutral position before the racks are raised to positions determined by the setting of the key stops. As the lever 60 completes the up stroke the pawl 66 is turned by engaging a pin 72 on the arm 62 and on the downward movement the pawl is effective, through the pin 72, to rock the lever 60 clockwise to put the totalizer into engagement with the racks 32 before they commence their return movement during which time the item is added. Sudden movement of the totalizer from or into its neutral position is ensured by a spring controlled detent 73, Fig. 10, cooperating with a pin 73b on the rocker arm 55. The totalizer is conditioned for subtraction by depression of a subtraction key 203, Fig. 11, which by displacing a slide 198 rocks an arm 197 resiliently connected thereto. This arm, through an arm 194 and pin 196, shifts the link 50 so that its surface 207 engages the pin 54 whereupon on the ensuing downward movement of the link the pin 54 is caused to enter its notch 52, the pin 53 being then disengaged. On the return stroke the link 50 is raised and the pinions 30 moved into engagement with the racks 33. Auxiliary totalizer engaging and selecting mechanism.-Each of the rear counters is moved into and out of engagement with the actuating racks 226 by a pair of racks 243 Figs. 1, and 23, operated by mutilated gears 244 on a corresponding shaft 245. Each shaft has an arm 246 carrying a link 247 adapted to be coupled to a pin 251 on a plate member 248 supported by parallel arm 249. The arm 13 on the main shaft carries a pawl 262 which cooperates with a lever 259 pin and slot connected to an arm 261 and provided with a pin 258 to engage a notch in a link 256 connected to a lever 253 the other end of which is formed with a cam slot 254 engaging a pin on the plate member 248 whereby the latter is reciprocated. A spring controlled detent ensures rapid movement of the lever 253 from one position to the other. The means for selecting the counters comprises four keys 274 each of which controls a slide 276 having a lug engaging a corresponding yoke 279, 280, 281 or 282 Fig. 4. The yokes are connected to their respective links 247 by links 284 through pin and slot connections. When the " A " totalizer key is depressed the link 284 is raised to place the pin on the upper link 247 at the bottom of the slot so that on the rearward movement of the plate 248 the link will be raised by its spring to engage the pin 251 on the plate. Early in the return movement of the shaft 15 the plate will cause the link 247 to rotate the shaft 245 to put the totalizer into operative position. Transfer mechanism.-In normal operation the downward movement of the main racks 32, 33 is limited by lugs 130 Fig. 15, engaging pawls 131. At transfer a transfer tooth depresses a dog 134 associated with the pawl 131 of the next higher denomination so as to free it from a bar 132 and by action of the spring 136 frees the lug from the pawl 131 permitting an additional step movement to the rack. Whenever the main totalizer passes through zero the " fugitive unit " must be introduced. This is effected as shown in Fig. 14 by connecting the dog 140 of the highest totalizer pinion to a pawl 138 cooperating with the lug of the units rack 32. Restoration of the transfer parts is effected on the succeeding operation by means of rods 144 Fig. 13 on bell cranks 145 operatively connected through a bell crank 147 to a link 148 connected with an arm 149 Fig. 1, pivoted on a shaft 150. The link has a lug 153 engaging a cross bar 154 on an arm 155 that is connected by a link 158 to a lever 159 operated by the forked end 17 of the operating lever 18. A common transfer mechanism is provided for the auxiliary totalizers so that only one can be selected at a time. It comprises a stationary member 230 Fig. 1, a set of transfer levers 232, Fig. 24 normally engaging lugs 231 on the racks 226, and shouldered slides 235 between the racks 226 with lugs 238 for cooperation with transfer teeth 239. At transfer the tooth 239 raises the slide 235 so that the pawl 232 of the next higher denomination is tripped from the shoulder 234 to the shoulder 236 permitting an additional upward movement to the corresponding rack. The parts are restored by means of a pin 241 on the arm 149 that is connected to the restoring link 148 swinging the transfer levers 232 clockwise to depress the racks the slides being drawn down by their springs until the levers engage the shoulders 234, Total-taking mechanism.-A total or subtotal may be obtained after the machine has performed a blank operation by the depression of the appropriate key 75 or 76 Fig. 10. The total key 75 controls a slide 84 yieldingly connected to an arm 88 on a yoke member the other arm 92 of which when the slide is displaced operates a link to move the link 57 into contact with the pin 95 on the lever 60 thus disengaging the pin 59 from the notch 58. The link 57 is thus ineffective to withdraw the totalizer from the racks on their upward movement as the lever 60 swings idly. The pin 95 thereupon enters the notch 96 and on the downstroke the link 57 is effective to withdraw the totalizer leaving it cleared. In sub-totalling the key 76 controls a slide 85 with an upright projection 97 which co-operates to move the total slide 84 and through a cam surface 99 at its upper end rocks a yoke member 101, the arm 103 of which depresses the pawl 66 to prevent its engagement with the pin 72 on the return stroke of the arm 64 so that the link 57 is not operated to withdraw the totalizer which retains its amount. The type bars are permitted to move with the racks by withdrawing the detent plate 24 Fig. 1, which is ensured by connections with a rocker 106 operated by the slides 84, 85. To take a total from an auxiliary totalizer the corresponding selecting key and a total key 288, Fig. 25, must be depressed. Depression of the total key 288 displaces a slide 290 and through a yieldingly connected yoke member 299 operates a link 300 to free the pin 258 from the notch on the link 256 and press the link against the pin 302. During the blank cycle the selected totalizer is put into engagement with the racks and on the ensuing cycle the pin 302 enters the notch 303 at the end of the upward movement of the arm 13 so that on the return movement the totalizer is withdrawn. In sub-total taking operations a sub-total key 289 is depressed which controls a slide 291 with an upright projection 304 co-operating to move the total slide 290 and rock a yoke member 309 to depress the pawl 262 so that the totalizer is not withdrawn on the return stroke. The totals and sub-totals keys are latched in depressed position by a latch plate 109, Fig. 11, which is operated to free the keys at the end of an operation by a rocker plate 119. To ensure a blank cycle before total taking a locking slide 160, Fig. 16, is positioned to prevent depression of the total or sub-total control keys on item entering operations. This slide is reciprocated by a pin 167 engaging a cam projection 166 on an arm 164 rocked by a crank pin 168 carried by cams 169, 170 on the main shaft. The arm has a shaped slot 175 in which works a projection of an arm 172 of a yoke member on a shaft 173. The other arm of the