Patent GB-567290-A (GB)
Abstract: 567,290. Calculating - - apparatus. REMINGTON RAND, Inc. Oct. 31, 1942, No. 15352. Convention date, Nov. 12, 1941. [Class 106 (i)] A computing-machine having a creep carry accumulator of the kind including, for each denomination, a numeral gear, a resultant gear, and a zero stop disc with a co-operating stop arm, is provided with latching means for holding the stop arms clear of the zero stop discs during adding or subtracting operations and for rendering them effective to arrest the gears at their zero position during total taking operations. The machine to which the invention is shown applied comprises a multiple-bank keyboard 17, Fig. 4, differential actuating rack bars 66, printing mechanism with type bars 111, and operating cams arranged on the main shaft 30. The key stems co-operate with corresponding sets of stop-pins 24 and a zero stop 24a that are controlled by detent plates 25. When a key in any bank is depressed, its zero stop is raised and the appropriate stop-pin 24 depressed to act as a stop to determine the differential movement of the corresponding rack 66 when the bail 42 is operated. Movement of a rack 66 is transmitted by pinions 113 to the corresponding type bar 111. The main shaft 30 is provided with an operating crank 31, Fig. 2, and carries a set of cams 33, 37, 43, 47 and 53, co-operating with cam followers 34, 38, 44, 48 and 54 on arms arranged on a shaft 36. The cam 33 and follower 34 serves to determine the home position of the main shaft at the end of the cycle of operation. The cam 37 and follower 38 operate a link 40 to control the release and restoring bail 42 for the actuating racks 66. The cams 43, 47 and their followers operate to control an arm 46 and a lever 50 during a total taking operation, as hereinafter described. The cam 53, Fig. 2, through its follower operates a link 56 to rock a pair of cam levers 57, 60, Figs. 2 and 3, to control the timing of the engagement of the totalizer wheels 76 with the actuating racks and the operation of latch mechanism to be described. Totalizer mechanism. The totalizer which forms the subject-matter of Specification 567,315, has denominational orders as shown in Figs. 6 to 11, each comprising a resultant gear 73, a floating gear 74, an eccentric hub 75 and a nine-toothed numeral gear 76. Each hub is secured to the face plate of the gear 73 in the next lower order, while the hub in the units order is secured to a plate 85 formed with a lug 86 engaging a slot in the totalizer frame 91. The numeral gear 76 is formed with three pins 83 that extend into apertures 84 cut in the floating gear 74 and form part of the coupling. The highest order resultant gear 73 is secured to a sleeve 87 free on the supporting shaft 63. A notch 88 in each of the gears 73 serves as a stop point during a total taking operation. The totalizer frame comprises side plates 90, 91 and cross-bars.92, and is raised and lowered by the cam slots 61, 62 in the levers 57, 60 engaging the shaft 63. After setting up an item, the amount is added by turning the crank 31 in the clockwise direction while the amount is subtracted by a reverse rotation of the crank. Total taking mechanism; latching mechanism. For controlling the totalling operation, a series of tripping levers 93 and latches 98, Figs. 4 and 14, is provided. The levers 93 are rotatably mounted on a cross-shaft 70 which engages the cam slots 67, 68 of the levers 57, 60 for vertical reciprocation with the totalizer frame. Each tripping lever 93 with the exception of that for the lowest order is formed with three arms carrying respectively a tripping lug 95, a stop 97 and a detent 93c. A bent-over portion 96 on the stop arm engages a hook 101 on the corresponding latch 98, while the stop 97 is off-set to co-operate with the notch 88 in the resultant gear 73 of the next lower order. The forward extending arm of the latch has a V-shaped notch for co-operation with the lug 95. During entry operations, the latch-tripping mechanism is held disabled by a bail 104 that is connected by links 107, 108 to the lever 50. When a total is to be taken, the operator rocks a lever 117, Fig. 3, towards the front of the machine. The crank is turned in the counter-clockwise direction and the totalizer gears are engaged as in the subtract operation. The latch bail 104 is moved to the rear by the motion of the lever 50 and cam 47. This movement releases the lowest order tripping lever 93 to remove the detent from the units order numeral wheel 76 allowing it to be rotated by its rack 66 to its zero position. This causes the unlatching of the next tripping lever 93 by the camming action of the lug 95 and allows the tens wheel 76 to return to zero position, the action continuing until all wheels have been zeroized. The movement thus imparted to the racks 66 is transmitted to the type bars 111 and printed. During this operation, a pin 51 on the lever 50 acts to raise a lever 52, Fig. 4, to engage a hook 130 thereon with a half-stud 45 on the cam-controlled arm 46, thereby raising a set of spring- controlled pawls 124 to engage the actuating racks to hold them in set position until restored by the bail 42. Specification 272,569, [Class 106 (i)], is referred to.