Patent GB-639064-A (GB)
Abstract: 639,064. Calculating-apparatus ; transfer mechanism; zeroizing-mechanism. GORDON, R. G. Sept. 19, 1947, No. 25593. [Class 106 (i)] In an adding machine, items are entered by independent toothed segments 11, Fig. 4, each having finger-operated means 13, 16 by which the segment is brought into gear with the corresponding wheel of a register R and then rotated an amount indicated on a scale 64, Fig. 1, to enter the required digit, the segment being then immediately and automatically disengaged from the register so that only one segment is engaged at a time. As shown, the segments mesh with gears 28, Figs. 4, 7, on the register or totalizer numeral wheels 36, directly for addition, or through intermediate gears 41 for subtraction, according to the position of register-carrying rocker plates 43 which are pivoted on pins 44 and rocked by a knob 83. Each segment is pivoted on a separate shaft 12, Figs. 4, 6, slidable in slots 23 in end bearings 21. A bush 25 between segment and shaft carries two cams 24, one of which is connected by a link 22 to a bar 17 slidable on the segment. When the bar is pushed down by a key 16, the cams 24 coact with a fixed rod 26 to raise the segment into engagement with the register. The segment is then rotated until a ring 63 on the finger-piece 13 overlies the digit to be entered, after which the key 16 is released and a spring 54 moves it, and therefore the segment, to the disengaging position, the segment being held by a spring-urged retaining bar 31 engaging teeth 30. When the whole item has been set up, depression of a key 62, connected by a yoke 60 and rods 59 to pivoted levers 48 carrying the bar 31 releases the segments which are returned by springs 66 and stopped in the zero position by a bar 56. The bar 31 may carry collars (not shown) for laterally spacing the segments. A separate items register may be provided. The key 16 and finger-piece 13 may be replaced by a key 68, Fig. 8, on a lever 69 pivoted on the segment and having a pin-and-slot connection with the bar 17. Depression of key 68 rotates the lever 69 first to actuate the bar and then abut a part 74 to rotate the segment. According to the Provisional Specification, a lever pivoted on each segment carries a toothed sector which meshes with a gear on a cam which may engage an antifriction device, e.g. a roller, to raise the shaft of the segment. Alternatively, the lever may rotate a crank-shaft on which the segment is mounted. The segments instead of the register may be shifted to change from addition to subtraction. The segments may be retained by ball catches. Transfer mechanism..The numeral wheels 36, Figs. 4, 7, carry transfer pins 67, each of which engages a gear 46<SP>1</SP> of a corresponding wheel whose gear 46 meshes the gear 28 of the adjacent wheel 36 to effect transfer. Spring- urged retaining pawls 40 engage cut-away portions 29 in the gears 28. Zeroizing-mechanism. On rotation of the numeral wheel shaft 34 by a knob 75, Fig. 7, a pin 78 moves over a cam face 80 out of a slot 79, against a spring 77, to bring pins 76 in line with webs 39 on the numeral wheels 36 so that further rotation of the shaft returns the wheels to zero.