Patent GB-634325-A (GB)
Abstract: 634,325. Cash registers. NATIONAL CASH REGISTER CO. July 1, 1947, No. 17315. Convention date, Nov. 14, 1941. [Class 106 (i)] An accounting or similar calculating-machine of the type disclosed in Specifications 447,481 and 605,926, adapted to print on inserted record material and including release means, has means to sense the presence or absence of said record material, manipulative devices adapted to control operation of the sensing means, locking means for the release means, and connections between the sensing means and the locking means so constructed and arranged that, during a machine cycle wherein the sensing means is operative and senses the absence of the record material, the locking means is rendered effective to prevent release of the machine for a further operation. When the record material is fed out of the path of the sensing means such means, if operated, will effect operation of the locking means. Mounted on a rod 395, Fig. 13, is a lever 396 one arm of which has a slot engaging a stud 397 on a link 398 pivoted to an arm of a yoke 399 connected by a link 400 to an arm 401 secured to a shaft 402. A two-armed lever 421 loosely-mounted on the shaft 402 has an arm connected by a spring to a lever 409 and carries a stud 423 which coacts with a finger 424 of the lever 409 which has a hook 415 which normally engages a stud 407 on an arm 406 mounted on the shaft 402. The other arm of the lever 421 is connected by a link 425 to one arm of a pivoted bell-crank lever 426, the other arm of which is connected to a vertically-slidable feeler 428 which is spring-urged upwardly and is in line with a slot in the table on which the record material is manually placed. A stud 436 on a lever 434 on the shaft 402 normally engages the lever 421 to maintain the feeler 428 in its down position below the table. The lever 434 has a roller 447 which coacts with a cam 446 on the main printing drive shaft 313 so that during certain operations, when the shaft 313 rotates, the lever 434 is rocked clockwise removing the stud 436 from the lever 421, whereupon the feeler 428 moves upwardly through the slot. If the feeler 428 is arrested by the presence of record material on the table the movement imparted through the above linkage to the lever 409 is insufficient to release the hook 415 from the stud 407 so that the lever 396 is retained in the position shown. If, however, the feeler 428 is not arrested, either due to the absence of record material or due to the record material having been fed out of its path, the hook 415 disengages the stud 407 and the lever 396 is rocked counter-clockwise until the projection 403 thereon strikes the top of the pawl 404 which forms the release means and which has been previously rocked clockwise at the start of the machine cycle of operation. When the pawl 404 returns to its initial position at the end of a machine cycle the projection 403 will be pulled down in front of the pawl 404 and so prevent release of the machine for a further cycle of operation. The feeler 428 is only freed to effect sensing by depression of certain keys, not shown, which control the position of two notched discs 448, 449 which are carried by a shaft 329 and which co-operates with two feelers 450, 451 pivoted to a lever 453. The lever 453 controls the position of a lever 459 which normally engages a stud 460 on a vertical arm 461 attached to the bell-crank 426 to prevent movement of the feeler 428. Certain of the keys on the keyboard when depressed cause rotation of either of the discs 448, 449 and if both of the feelers 450, 451 or one of them, engage notches on the discs 448, 449 the lever 459 will be moved so that the stud 460 is freed and the sensing operation is effected as described above. During each machine operation a cam 465 on the shaft 313 effects a slight downward movement of the arm 406 so that the disengagement of the hook 415 and the stud 407 is facilitated. To free the machine for a further operation the lever 473 is moved counterclockwise against a spring 482 which movement is transmitted by an arm 475, a shaft 476, an arm 477, a lever 480, a link 481, to effect clockwise movement of a lever 462 on the shaft 402 and so cause re-engagement of the hook 415 with the stud 407 and the return of the lever 396 to its normal ineffective position. Specifications 280,828, [Class 100 (iv)], and 629,421 also are referred to.