Patent GB-124694-A (GB)
IPC: G06C11/04
Abstract: 124,694. Wade, H., (Burroughs Adding Machine Co.). Jan. 2, 1918. Type-bar machines; hammer-impression arrangements; accenting and like arrangements.- relates to adding &c. machines having a progressively shifting carriage provided with a field of stop-pins in uniform series, one for each denomination, upon which each item is first set by the keys and subsequently communicated to the differential type-carriers and totalizer actuators, and comprises improvements (1) in the latching of hammers for the printing mechanism; (2) in the provision of a latch control for the hammers of type members for printing distinguishing-marks, and (3) in a returning mechanism for the types. (1) The hammers 300 are separately pivoted on a cross-bar 301 and are actuated by springs 302. A bail 304 retracts the hammers, being forked at 307 to embrace a roller 308 on a rearward extension of the rackrestoring frame. A bail 310 common to all the hammers engages notches 300<a> in the hammer heads. A side member of the bail has a depending arm 311<a> connected by a. spring 311<b> to a cross-rod 303. A bail 316 is adapted to displace the bail 310 by engaging its side arms, and has depending from a side arm a finger 312 connected by a spring 313 to a cross-rod 301, and the finger lies in the path of a roller 314 on the rackrestoring frame, and is engaged by the roller near the end of its stroke, whereupon any hammers which should act are fixed. Individual restraining latches or hooks 315 are normally held out of engagement against the influence of springs 318 by means of a bail 316. The books have rearward extensions downturned at 315<a> adjacent the line of travel of curved fingers 100<a> on the rack levers 101 which actuate the type-bars 15. The ends of the fingers are spaced from the bent ends 315<a> a distance corresponding to the movement of the slide bars to bring zero types to printing position. Thus, when the bail 316 moves rearward, such hooks as are associated with typebars moved beyond zero position will be blocked. In other orders, the hooks 315 will engage and restrain the hammers, lost motion between the bail 316 and the yoke 310 allowing the hooks to be positioned first and then the bail or yoke 310 to be acted upon. The arms 315<a> have laterally turned tails which underlie successive arms to the right to allow of printing zero to the right. When a non-print key 11 is depressed, a pin 321 engaging the bifurcated end of an arm 322 pivoted at 323 moves the arm which is in one with an arm 324, and this rocks a bail 328 into the position shown in dotted lines (Fig. 5). thus restraining all the printing-hammers. (2) A type-bar 500, Fig. 5, carries three special types for distinguishing non-added items, sub-totals, and grand totals. A spring 503 tends to move the carrier up to printing position, but a yoke with three steps a, b, c limits the movement. A separate hammer 510 is provided. This hammer is retracted by the bail 304 and latched by the main latching yoke 310; it also has a separate restraining hook 511 which has a depending tail 514 and a lateral stud 513. When the non-print key 11 is depressed, a link 516 with guided slotted ends is moved so that the lug 515 comes under the stud 513 and prevents the hook 511 engaging the hammer. In the normal position, the step a is engaged by the stud 502<a>, so that when the non-print key is depressed and the hammer fixed, the item is marked correspondingly. Depression of total or sub-total keys moves a link 529 to rock a cam-piece 526 under the tail 514 and prevent engagement of the hook 511. A connexion 525 from the rocker to the yoke serves to position it for the steps b or c. (3) The types 16, Fig. 3. slide in. housings 15<a> on the type-bars and are headed at each end. They are returned by a spring 16<g>, and a parallelogram mechanism, one link 16<b> of which engages lugs 16a on the types. Specification 124,693, [Class 106 (i), Calculating &c.], is referred to.