Patent GB-464462-A (GB)
Abstract: 464,462. Calculating - apparatus. NYBERG, E. V. Oct. 17, 1935, No. 14890/36. Divided out of 464,422, under which a Specification was laid open to inspection under Sect. 91 of the Acts, April 18, 1936. [Class 106 (i)] In a machine with a differential mechanism comprising adjustable teeth mounted on a carriage and actuator wheels, mounted on a rotatable shaft for co-operation with said teeth, the carriage is provided with means that co-operate with the adjustable teeth to give an indication of the item set up. As shown in Figs. 2 and 3, the keys 30 are arranged in two rows on levers 75 pivoted at 76, 77 respectively. The rear ends of the levers underlie bridge members 79, 79<1> ... 79<9>, as shown in Fig. 9 pivoted on an axis 80. The bridge for the zero key has a projection 81 connected by a link 82 to an arm 83 pivoted on a shaft 84. The arm 83 carries a fixed rack 85 and a longitudinally displaceable spring-controlled rack 86, that is normally engaged by a spring- controlled dog 89 pivotally mounted on the carriage 2. The carriage 2 supports the rows of teeth 3, the number of teeth in each row being projected successively into operative position in accordance with the value of the key depressed. Each time the zero key bridge is rocked up and down two half step movements are imparted to the carriage 2 to bring the next row of teeth into position to be raised by the projections 91 on the bridges. 79<1> ... 79<9>. The projected teeth are held in raised position by a projection on each tooth engaging a pivoted latch bar 5, Figs. 5 and 6. Each latch bar is provided with a finger 94, Figs. 2 and 7, that co-operates with a spring- controlled arm 96 bearing against a longitudinal bar 100 having two surfaces connected by an inclined portion 101. During the movement of the carriage in setting up the teeth the arms 96 opposite the narrow part of the bar have no influence on the latch bars but on the return movement of the carriage the arms 96 by contact with the wide part of the bar cause the latch bars 5 to be deflected so as to permit the projected teeth to fall by their own weight to inoperative position. After the item has been set up on the, teeth 3 of the carriage the main operating shaft 6 is rotated and pairs of arms 7 thereon carrying a gear train 8, 9, 10 rotates therewith sothat the pinion 9 in passing the operative teeth 3 is actuated and transmits the movement through the gear train and other gears 24, 25, to the totalizer numeral wheels 23. Transfer between the adjacent numeral wheels is effected in a known manner. To indicate the item set up numeral wheels 102, Figs. 2, and 8 are provided ; these wheels are loose on a shaft 106 and are formed integral with pinions 103 gearing with pinions 116 mounted for rotation on a shaft 117 and having hubs around each of which is wound a spring 118 secured at one end'to the pinion and anchored at its other end to the casing. The pinions 116 mesh with racks 121 guided in recesses in the carriage 2 and normally abutting the first tooth 3. The teeth 3 when raised to operative position align recesses 92 therein with the rack so that the spring 118 acts to displace the rack to an extent determined by the number of teeth raised, the movement being transmitted to the corresponding numeral wheel 102. The wheels 102 have annular recesses 104 in the hub portions with pins 105 extending axially parallel to the shaft 106. In the shaft 106 is a key groove in which is mounted a longitudinally displaceable bar 108 with projections 110 normally out of the path of movement of the pins 105. At the right hand end of the bar 108 is a projection 112 normally seated in a recess 113 on a collar 114 fixed to the wall of the carriage. To reset the item indicator, the shaft 106 is rotated whereupon the bar 108 is displaced by the projection 112 riding out of the recess 113 and the projections 110 move into the path of movement of the pins 105 which are picked up to restore the numeral wheels to zero at the same time withdrawing the racks 121 to their initial position. Simultaneously with this zeroizing movement the return movement of the carriage 2 is effected. For this purpose the shaft 106 through gearing 144, 145, Fig. 10, drives a vertical shaft 134 in which is slidably mounted a spring-controlled key 137. The key is formed with two projections 138, 139, the upper projection 138 normally rests in a recess of a fixed collar 140 but when the shaft 134 is rotated the projection moves out of the recess to lower the key, whereupon the lower projection 139 picks up a pin 135 projecting from a roller 133 journalled on the shaft 134. To the roller 133 is secured one end of a steel band 130 that passes over a guide pulley 132 and is secured at its other end to the carriage 2. By this means the spring is wound up and the carriage is returned to its initial position against the action of its spring 125.