Patent GB-783870-A (GB)
Abstract: 783,870. Accounting machines. BURROUGHS CORPORATION. Dec. 8, 1954, No. 35593/54. Class 106 (1). In an accounting machine with a tabulating paper carriage, and having a tabulating stop projectable into the path of carriage stops and movable laterally by the carriage stops to decelerate and arrest the carriage in position, control means are operated by the lateral movement of the tabulating stop to retard its return from projected position. The invention is applied to the machine described in Specification 783,869, which machine comprises a tabulating paper carriage furnished with stops 57 engageable with function control members 60, 62 and 63, and a tabulating stop pawl 61 projecting upwardly through a control plate 59 secured to the machine framework. Marginal stops 477 also are provided and are adapted to engage edges 311, 311<SP>1</SP> flanking the operative tip 611 of the tabulating pawl. The stops are assembled according to requirements on a shaft 53 which is rotatable by means of a knob 55 in order to select any one of four pre-set control sequences. The tabulating pawl is guided for vertical movement between a pair of plates 320, 321, Fig. 8, secured to a bar 312 urged to the right by a spring 319 so that the edge of the pawl abuts the control plate slot. Vertical movement of the tabulating pawl is controlled by an arm 308 on a shaft 297 adapted to be actuated by a lever 296, Fig. 5, through the intermediary of an arm 304. Tabulation, whether initiated automatically during a machine cycle or manually, is effected by counterclockwise movement of the lever 296 the flanged end 298 (see also Fig. 3) of which raises the carriage rack 300 clear of the letter-spacing pinion 302, the arm 308 simultaneously raising the tabulating pawl 61 whereupon its enlarged head snaps over the surface of the control plate 59, under the action of the spring 319, thus locking the pawl in its raised position against the action of spring 322 tending to return the carriage rack. The impact of the next carriage stop against the tabulating pawl disengages it from latching engagement with the control plate so that the carriage rack is free to re-engage the pinion 302, the arm 308 simultaneously lowering the pawl 61 clear of the carriage stop. The present machine includes a dash-pot 523 for absorbing impact of the carriage stops on the tabulating pawl and for maintaining the pawl in its raised position during rebound even though released from latching engagement with the plate 59. For this purpose the left-hand (Fig. 8) end of the bar 312 abuts an ear 519 at the end of a lever 517, Figs. 3 and 5, pivoted at 518, the other end of the lever being connected to the piston of the dash-pot. The cylinder of the dash-pot is pivotally mounted at 525 on an arm 526 secured to the shaft 297. As a result, carriage impact on the tabulating pawl is transmitted through the bar 312, the lever 517 and the dash-pot to urge the shaft 297 in a counter-clockwise direction and so to maintain the tabulating pawl in its raised and effective position until the carriage has settled in correct position. Mechanism is provided for lowering the control members 60, 62 and 63 clear of the carriage stops 57, in certain circumstances, and for lowering the tabulating pawl 61 as well as the control members clear of the margin stops 477 when it is desired to adjust the control shaft 53 carrying these stops. Arms, as 478, on a shaft 315, Fig. 8, overlie studs, as 480, on the control members. The shaft 315 is adapted to be rocked counterclockwise upon adjustment of a manual control (not shown) to condition the machine for straight typewriting operation; this lowers the control members so that carriage movement is not impeded thereby. An arm 484, Fig. 5, on the shaft 315 carries a bifurcated member 490 (see also Fig. 4, not shown) engaging under a bar 489 mounted on the two side frames 54, Fig. 10, of the carriage. This bar 489 is suspended from the carriage frames by means of springs 491 and has a pin and cam-slot engagement with the frames so that longitudinal movement is accompanied by downward movement. An upwardly directed arm 497 at one end of the bar 489 engages the usual carriage return handle 52. When the carriage is returned the slight rocking movement of the handle 52 which occurs is transmitted to the bar 489 which consequently lowers to rotate the shaft 315 and withdraw the control members 60, 62 and 63 so that return of the carriage is not impeded. The bar 489 terminates in a finger piece 496 which is depressed when adjusting the shaft 53. This imparts a greater movement to the bar 489 and shaft 315 so that the control members are completely withdrawn and clear of the margin stops 477 as well as the carriage stops. In addition, the arm 478 engages a finger 481 of the arm 308 controlling the tabulating pawl 61 so withdrawing also the tabulating pawl. With all the members 60-63 withdrawn, the control shaft can be adjusted without obstruction. A pivoted bell-crank latch 503, Figs. 10 and 17, interlocks the control shaft 53 with the bar 489. Normally, a stud 510 on the rear arm of the latch 503 seats in one of four notches 509 in the control shaft knob 55 which locks it against rotation owing to the engagement of the front arm 506 of the latch against the face of the bar 489. Full downward movement of the bar, when operated by the finger piece 496, clears the latch arm permitting rotational adjustment of the shaft, the latch entering a notch in the bar to hold it down. When the stud 510 enters the notch at the next adjustment position, the latch 503 returns releasing the bar which returns upwardly to secure the latch again in locking engagement with the knob 55. Specification 783,873 also is referred to.