Patent GB-461423-A (GB)
Abstract: 461,423. Typewriters &c. NATIONAL CASH REGISTER CO. June 13, 1935, No. 33495/36. Convention date, June 25, 1934. Divided out of 461,347. [Class 100 (iv)] [Also in Group XIX] Tabulating - mechanism ; carriage - returning mechanism.-A calculating or similar accounting machine with a travelling carriage and return mechanism therefor has a plurality of return members adapted to control selectively the return of the carriage to predetermined column positions by utilizing a stop lever differentially settable under control of the return members which cooperates with stops on the carriage, the stops being formed with cam surfaces adapted to restore the stop lever to inoperative position during the normal carriage movement. In the machine shown, which is of the Ellis type as described in Specification 28253/08, [Class 106], three return bars are provided, one of which when depressed is effective to release the machine for operation and to cause the platen to be line-spaced. The return bars 310, 311, 312 shown in Figs. 8 to 11, are connected to pitmans 313, 314, 315 supported at their rear ends on a bar 316 and provided with cam apertures 318, 319, 320 which co-operate with a pin 321 on a lever 322. An arm 324, pivoted on the lever and flexibly connected thereto by a spring 325, is formed with projections 326, 330 which co-operate with stops 331, 332 adjustably mounted on a bar on the carriage. The pitmans are also formed with cam surfaces engaged by a roller 342 on a link 343 attached at its upper end to a lever 344 on which bears a lever 346, Fig. 13, connected by a spring 348 to a lever 349 of the return clutch mechanism 350. The gear 351 of this mechanism meshes with a rack 353 slidably mounted on the carriage. Depression of the return bar 310 moves the pitman forwardly, but the cam 318 has no action on the pin 321 so that the projections 326, 330 of the arm 324 remain in inoperative position. The link 343 is, however, raised by the roller 342 and the clutch mechanism is effective to return the carriage to the left marginal stop. The rack 353 continues its movement independent of the carriage until it receives a downward movement by reason of the pins 334 engaging the cam slots 354, whereupon it declutches the gear 351 from the driving disc 377 and the spring 359 returns the rack to its normal position, the shock being absorbed by a plunger 361. Depression of the return bar 311 moves the pitman 314 and the cam 319 acting on the pin 321 rocks the arm 324 to move the projection 330 into the path of the stop 332. At the same time the roller 342 is operated to throw-in the clutch and the carriage returns until arrested by the stop 332 engaging the projection 330 ; the rack is then restored to normal. Depression of the return bar 312 moves the pitman rearwardly and the cam 320 effects the movement of the arm 324 to place the projection 326 into the path of movement of the stop 331. The roller 342 at the same time throws-in the clutch 351, 377 and the carriage returns to the position determined by the stop 331. In the normal tabulating movement from left to right cam surfaces 327, 328 on the stops co-operate with the projections on the arm 324 to move it back to inoperative position. During the machine operation also the lever 322 and arm 324 are restored by the usual operating plate 58 co-operating with a projection 378 on the lever 322. Depression of the bar 312 by means of a link 394 rocks a pawl 395 to engage a projection 397 on the line spacing bar 186, Fig. 7. A stud 460 on an extension of the bar 312 through an arm 461 on the release shaft 462 moves a locking plate 464 from engagement with a stud 467 to free the motor clutch release plate 67. The return bars are locked during the first half of the machine cycle while the impression mechanism is operated. As the driving arm 61, Fig. 8, starts its upward movement a pin 398 thereon, through an arm 399, displaces a link 400 to rock an arm 401 which is frictionally connected to a lever 404 so that the lever is rocked to move a projection 406 thereon into a notch 407, 408 and 409 of each of the pitman 313, 314 and 315. During the return movement the arm 401 contacts a pin 411 on the lever 404 to withdraw the projection 406. To ensure a full stroke of the rack 353 in its movement relatively to the carriage to disengage the return gear a pawl 386, Fig. 13, mounted on a bracket 335, is urged by a spring into engagement with ratchet teeth on a plate 389 on the rack. The pawl is only disengaged when the full movement is completed by a pin 390 rocking the pawl to place the spring on the other side of the pivot of the pawl. The rack is then free to return and a pin 393 returns the pawl to effective position. Specifications 424,132 and 424,149 also are referred to. Line-spacing mechanism.-The platen is linespaced upon the return of the carriage to its starting position by the usual mechanism as shown in Fig. 7, and a mechanism is provided to effect line - spacing at any intermediate position. For this purpose the platen feed bail 162 is formed with an extension 374, Fig. 4, engaging the bent end 373 of an arm 369, Fig. 6, pivoted on a stud 368. The rack extension has a camming projection 364 which co-operates with a roller 365 on an arm 367 pivoted on the stud 368. The arm 369 is formed with a bushing 370 supporting a spring plunger 371 that may be adjusted to enter an aperture in the arm 367. When the carriage is stopped in its return movement by any one of the stops, the rack 353 as described above moves independently and by means of the projection 364 in co-operation with the roller 365 rocks the arm 367 and therewith the arm 369 whereby the bent end depresses the platen feed bail 162 to effect line-spacing. A full stroke pawl 380 that co-operates with a bevelled edge of the bent end ensures a complete movement of the arms 367, 369.