Patent GB-536898-A (GB)
Abstract: 536,898. Adding-machines. MONROE CALCULATING MACHINE CO. Dec. 12, 1939, No. 32045. Convention date, Dec. 20, 1938. [Class 106 (i)] A printing adding-machine provided with restraining means for the printing hammers is provided with control means adapted to co-operate with the differential actuator segments to take a total, such control including zero stops operable to signify the clear or non-clear condition of an accumulator, connections between the zero stops and the hammer-restraining means being adapted to maintain the restraining means in active position until the accumulator wheels are zeroized. General operation.-The registering segments are carried upon three-arm actuator levers 610 loose on a shaft 608 and having stop bars 615 each adapted to co-operate with the stems of a band of digit keys to limit registering movement imparted to an accumulator - 473. Type bars 611 are connected to the levers 610. Depression of a key will remove latch 214 from the path of the bar 615. The levers 610 are restrained by a spring-tensioned rocker frame 616 past a shaft 608 carrying latches 617 normally engaged by studs 659 of the lever 610. The movement of frame 616 is governed by a cam 318 Fig. 4 on the shaft 301 connected through arm 316, link 108, driving clutch plate 105 and pawl 103 with the member 104 of the clutch connected with an electric motor. Transfer in the accumulator is effected crawl fashion as described in Specification 272,569, [Class 106 (i)]. Totals are..taken as usual in which the accumulator is engaged with the segments and the latter allowed to zeroize the accumulator, the type bars being thus brought to printing position. When total key 278 is depressed it releases column latches 214 by engaging a stud 263 on release bail 227 which moves latches from the stop bars 615 freeing the actuator segments. The total lever also initiates a successive zeroizing of the numeral wheels in that it causes a rocking of shaft 206 to break a toggle 357 which supports the right hand of two plates on shaft 354 carrying a bail 355 underlying latches controlling zeroizing. The right-hand latch 361 Fig. 6, has link connection 362 with a member 363 free on shaft 354 and provided with a tripping finger 364 urged by a spring 365 to engage segment latch 617 of extreme right-hand arm 610 which when released is rotated by spring 683 to rotate the related numeral wheel The movement of member 363 will through link 366 move a pair of interconnected zero stops 367, Fig. 2, to bring a shoulder 368 of one into the path of movement of a shouldered index member 457 of the related numeral wheel, contact being made in the zero position. The lowering of bail 355 does not immediately release the latches of higher order members 363 since the latches with their links form toggles normally holding the higher orders latched. These are broken successively when the lower orders reach zero. Shoulders 457 contact with rollers 371 on dogs 372 pivoted on zero stops 367 and engaging the shoulder of push rod 373 pivotally connected with tripping lever 374 and supported at the free end by engagement with bracket 375. The tripping lever 374 has a lug 376 overlying higher order toggle 369 and adapted to break the toggle when roller 371 rides to top of index member 157. The member 363 at the extreme left hand is provided with pin-and-slot connection 377 with lever 378 overlying a shoulder on connecting rod 130 pivoted to lever 131 operating latch 112 restraining spring clutch lever 106 which when released causes pawl 103 to engage driving clutch 104. The motor then operates the printing mechanism. The lever 316 is oscillated by link 108 and through link 328 and arm 327 oscillates the shaft 302. A plate 708 fast on the shaft 302 engages a stud on the arm of restoring bail 707 normally lying in the path of hammer 715. As the shaft 302 is rocked, the hammer 715 is allowed to move under its spring. The movement of 708 brings the stud 709 into contact with a frame 704 upon which a series of tripping fingers 702 are mounted. These will be brought into contact with hammer latches 701 to release the hammers. Totals printing.-The toggle latches will prevent operation of the printing mechanism through the left hand member 363 until all the numeral wheels are zeroized. The motor operation will rock frame 616, re-engage latches 617 and restore the actuator segments in the known way. The bail 355 is restored during motor operation by the stud 379 on cam arm 318 fast on shaft 301. The stud 379 is thus brought against a hook 380 on one of the toggle links 357 whereby the toggle will be restored to supporting position and the bail 355 operated to restore latches 361, 369. At the end of the motor operation, the finger on arm 327 moves pawl 222 and lever 220 to move 223 and release the total key. In a modification the invention is applied to a listing machine with ordinary ten's transfer mechanism. Specifications 293,080, [Class 106 (i)], and 389,632 also are referred to.