Patent GB-265134-A (GB)
Abstract: 265,134. Burroughs Adding Machine Co., (Assignees of Horton, A. A.). Jan. 29, 1926, [Convention date]. Adding and subtracting apparatus.-In a keyset, independently-operated machine the totalizer is alternatively engageable with the differentialactuating devices and with a transfer mechanism which is movable, in either direction and is set for operation when the totalizer is in engagement with the actuating devices and is released for effecting the transfer movement when the totalizer is moved into engagement therewith. The. invention is shown applied to a machine of the type described in Specification 265,122. Movement of the totalizer actuating segments 235, Fig. 2, during an operation of the main handle is controlled by bars 233 with differential stops 252 cooperating with the stems of the depressed keys 10. The totalizer pinions 236 are rotatably mounted on a shaft 376 in side arms 377 connected to a rock shaft 278 on an arm 380 fixed on this shaft and having a roller engaging a cam plate 382, Figs. 3 and 10, fixed to a rock shaft 383 and adapted to be oscillated by means of a pitman 387 forked at its forward end for engagement with studs 200, 395 on the main cam plate 74. In adding operations the totalizer pinions are thrown into engagement on the return stroke of the cam 74 by the engagement of the stud 395 with the step 396 of a pawl pivoted to the pitman 387 and near the end of this movement are disconnected from the segments by the stud 200 engaging the projection 391 on the lower end of the pitman. When subtraction is performed the subtraction lever 226 is moved rearwardly and through the link 363 and arm 362 rocks a member 367 counterclockwise. Figs. 1 and 10, so as to place the pawls 399. 404 pivoted on the pitman 387 into the path of the studs 395, 200 respectively. Accordingly when the main shaft is operated the stud 200 operates the pitman to put the totalizer into engagement on the forward stroke and the stud 395 at the end of this movement by engaging the end 400 of the pawl 399 disconnects the totalizer pinions. A projection 401 on the pawl 399 is effective to raise the pawl 393 to inoperative position. Transfer mechanism.-Each totalizer pinion is provided with a transfer tooth 433 co-operating with a trip lever 422 pivoted on the side arms 377 so that when the tooth 433 passes the projection 423 on the trip lever the lever is held in its retracted position by a pivoted latch 426. In this position of the trip lever, when the totalizer is moved out of engagement with the actuating segments, it engages the lower arm of a detent 420, normally holding a toothed segment 413 associated with the pinion of next higher denomination, and moves it so as to disengage it therefrom the segment moving under the action of its spring 417 to advance the associated pinion one step. A restoring bail for the transfer segments comprises a shaft 430 carried by arms 429, Figs. 2 and 3, pivoted to the cam plate 382 and guided in slots in the side frame plates. The bail is raised as the totalizer pinions are moved to engage the transfer segments and releases the trip levers from the latches 426. On the subsequent movement of the main shaft the bail 430 is lowered and by engaging the depending arms 415 of the segments restores them to their normal position. In subtraction operations the totalizer pinions rotate in the reverse direction, and the movement of the transfer segments is reversed by changing the effective direction of the springs 417. The arm 362 associated with the subtraction lever 226 has a rearward extension 362<a>. Fig. 1, with a bifurcation engaging a pin on a pivoted arm 439<b>. the lower end of which is connected to a spring 437<b>, the other end of the spring being connected to a cam plate 436<b> so that when the subtraction lever is operated the parts move from the position of Fig. 1 to that in Fig. 10. A shoulder 436<c> on the cam plate then engages a pin 440 on the cam plate 382 so that the cam plate 436b moves with the cam plate 382 and rocks the arm 435 to which it is pivoted, causing a movement, through the pin-and-slot connection 434, of the bail 418 carrying the springs 417 from the position in Fig. 5 to that in Fig. 8. When the lever 226 is set to the adding position the cam plate is rotated to bring the hook 436<a> into the path of the pin 443 on the pitman so that the bail 418 is restored when the pitman is moved rearwardly. Printing totals and subtotals.-Depression of the totals key T, Fig. 1, rocks the member 367 to depress the end 400 of the pawl 399 into the path of the stud 395 on the main operating cam, to move the pawl 393 to inoperative position, and throw the pawl 404 through the connection 406 into the path of the stud 200. At the same time the member 367 raises a lever 358 to move its rear end into the path of a cranked arm 446. Fig. 3, of a shaft 447 pivoted in the side arms 377 and carrying a locking plate 448. When the totalizer pinions are moved into gear at the commencement of an operation the arm 446 engages the lever 358 and causes the locking plate to engage the upturned ends of the trip levers 422 to hold them against movement and arrest the totalizer pinions in the zero position. In subtotalling the action is the same except that the totalizer pinions are not disengaged at the end of the forward stroke since the end of the pawl 399 is not moved to active position. The segments 235 are moved in accordance with that of the pinions 236, the movement being transmitted to type bar 264.