Patent GB-190823729-A (GB)
Title: Improvements in Adding Machines.
Inventor: SCHOOLING WILLIAM
Filed: 1908-11-05
Granted: 1909-11-05
Abstract: 23,729. Schooling, W., and Randall, F. W. Nov. 5. Calculating apparatus.- In a rack-set, lever-operated, adding and listing machine, the items are set on loosely-mounted racks, having separate levers, to a position depending on the item to be set, and the subsequent operation of the main handle effects in turn, on the forward stroke, the printing, the rocking of the totalizer into gear with the racks, the resetting of the racks to zero with consequent registration on the totalizer of the item set, the release of the totalizer ; and on thereturn stroke, the transfer in the totalizer and the feeding of the printing- paper. A side elevation is shown in Fig. 1 and a plan in Fig. 5. The circular racks a, independently mounted on a sleeve b, are each provided with a lever or handle d by means of which the racks may be set. The racks gear with disks f for the purpose of indicating the items set through the aperture g, or the racks may be provided with strips of vulcanite having tne numerals marked thereon. If an error has been made in setting an item, the racks are returned by means of a mutilated pinion m, on a spindle n rotated by a handle o through the mutilated gearing p, q. If the item is correct, the totalizer is rocked into gear with the racks, by means of a roller 6 on the main handle u, Fig. 3, which engages a cam-surface 7 on a lever 8 connected by a link 10 to the rocking-frames 4 on which the totalizer is mounted, and the spindle n is then rotated by a segment i secured to the main handle u, which segment engages at the correct time a mutilated pinion v and through the pinions v<1>, w rotates the spindle n. The pinion v is rotated into the path of the segment t by its side tooth x which engages the side tooth y on the segment. Transfer-mechanism. Each of the totalling- pinions 14, gearing with the racks through the intermediate pinions 15, has a single transfer tooth 16 adapted to engage one of the pairs of teeth 17 on the mutilated pinion 19 and thereby to bring another pair of teeth into the path of the helicallyarranged teeth on the mutilated pinions 20, which are rotated on the return stroke of the handle u through the pinion 25 and segments 23 by the segment t. The segments t, 23 are brought into engagement by their side teeth 27, 26 respectively. To avoid difficulty when adding two items, such as 99, 99, caused by the teeth of the units and tens wheels being tripped at the same time, the teeth 21<a>, 21<b> on the pinions 20 are arranged so that transfer is effected first on the 2nd, 4th, and 6th pinions and then on the 1st, 3rd, and 5th pinions. Zeroizing - mechanism. The totals - indicating wheels are returned to zero by the mutilated pinions 34 gearing with the pinions 15, one tooth of the latter being reduced to form a gap at the zero position. Printing-mechanism. The type-wheels 42 gear directly with the setting-racks a. They are carried by levers 40 which are held in their normal position by a roller 44 on a releaser-bar 45 engaging the levers 47 pivoted to the levers 40 and having a forked end to engage the locking-pawls 50 to hold the type wheels in their set position. The bar 45 releases the levers 40 by means of a spring pawl 69 on the handle u engaging the lug 70 on the lever 71 and through the levers 73, 74 rotating the shaft 46, first causing the pawl 50 to engage the type-wheels and then allow the levers 40 to swing over and strike the inking-ribbon against the paper 54. A roller 75 on the handle u engages the cam surface 76 on the lever 74 and forces it and thereby the lever 40 back to their normal position. To prevent printing of zeroes to the left, pivoted levers 59, each having an arm 60 normally held in a recess 61, are provided with another arm 63 adapted to engage a lug 64 on each of the levers 40 to prevent their movement when the bar 45 is released. Another arm 65 has a pin 66 and slot 67, adapted to engage the slot on the next lever to the right and the pin on the lever to the left respectively. When a rack has been moved, the arm 60 is forced out of the recess and by means of the pin-and-slot connexion all the levers 40 to the right are free to move. The printing-paper 54 is fed forward after each operation by a pawl 82 on the handle u eagaging a ratchet-wheel 83 on the platen spindle. The inking-ribbon 53, Fig. 8, is fed from one spool 88 to another spool 88 mounted on sleeves 89 each having a ratchet-wheel 91 which is adapted to be rotated by a pawl 92 secured by an arm to a spindle 94 ; this spindle is rocked by the pawl 69 on the main handle u engaging an arm 95 on the spindle 94. The direction of motion of the ribbon is reversed by a tape on its end rocking a lever 99 the cam-surface of which moves the pawl 92 longitudinally to engage the other ratchet wheel. Totals, printing. The total is printed by turning the handle 110 so that a cam 111 engages a roller 113 to rock the totalizer into gear with the setting racks and through pinions 112, 117 to turn the clearing-spindle 35 to zeroize the totals wheels and set the racks to the totals ; this total may then be printed in the same manner as the items and re-registered upon the totalizer.