Patent GB-454938-A (GB)
Abstract: 454,938. Calculating-apparatus. ASTRAWERKE AKT.-GES., Chemnitz, Germany.- (Assignees of Maier, L.; 5, Heimgarten, Chemnitz, Germany) April 8, 1935, No. 10887. Convention date, April 17, 1934. [Class 106 (i)] In a calculating-machine for the four rules having a rotary differential actuating mechanism for actuating the totalizing-counter, and rack members, associated with the differential setting means, through the medium of which items and totals may be printed and amounts transferred between the totalizing- counter and another totalizer or revolutions counter, the rack members carry abutments or stops which, on the operation of the machine, effect the displacement of corresponding coupling pawls mounted on a rotatable driving shaft so as to couple said pawls to the actuating wheels of the totalizing-counter for a period determined by the differential setting of the rack members. The machine shown has nine banks of numeral keys 50, Fig. 2, an item indicator viewable through a window I, a laterally movable carriage with a totalizing- counter and revolutions-counter viewable through the windows L, K, a type sector 58, and printing-platen 59. Each key bank cooperates with a stop bar 4 having stops 41 differentially arranged with respect to the key stems. The rear part 33 of each bar is bent and forms a hook to engage a pin 5<1> on a corresponding arm 5 the upper end of which is pin-and-slot connected to a rack 6. The bars 4 are normally held against movement in the forward direction but are freed, when an item is set on depressing the keys, to move to extents determined by the keys depressed by the action of springs 7 on the arms 5 thereby moving the racks corresponding extents. To correct errors in setting each key bank has a key 51 which on depression restores the bar 4 to initial position through the action of a bell crank 55. Each rack 6 carries an abutment 31, Figs. 3, 4, and 6 which is positioned on the differential setting into the path of movement of a pawl 26 pivoted on a corresponding disc 25 keyed to the main operating shaft 24. During an operation of the machine the shaft 24 is rotated through a revolution and the pawls 26, which are in staggered relation, meet the abutments 31 and cause the pawls to be coupled to crown teeth of actuating wheels 29 whereby the wheels are rotated amounts depending on the setting of the abutment. The actuating wheels 29 gear with pinions 9 and transmit the movement through a reversing mechanism 10, 11 to the totalizer pinions 12. In the adding position, Fig. 4, the pinion 9 gears with the pinion 10 but for subtraction the shaft 9 is shifted laterally to engage the pinion 9 with the pinion 11. The revolutions-counter is driven in one or other direction by the projections 231, 23<11 >on a lever 23 reciprocated by an eccentric disc 57 on the main shaft. Over-running of the actuating wheels is prevented by a pawl 30 co-operating with notches 25a, 25b, of the discs 25. A shaft 70, rotating in unison with the shaft 24, has an arm 70a which at the beginning of the operating cycle pulls a link 70b so as to raise tne type sector 58 against the platen 59. At the end of the operating cycle a hooked arm 68 on the arm 70a engages a bail member 34 to restore the arms 5, racks 6 and stop members 4 to initial position. Transfer mechanism.-Each gear wheel 10 is provided with a transfer tooth 10<11> which co-operates with a pivoted lever 21 having at its lower end a cam member 21<1> which when a transfer is to be effected is moved into the path of movement of the coupling pawl 26 of next higher denomination so as to rotate the actuating wheel 29 an additional unit movement. The lever 21 is held in one or other of its positions by a catch 73. At the end of an operating cycle the displaced levers 21 are restored to inactive position by members 221 operatively connected to a slide 75, Fig. 9, reciprocated by cams 37, 39 on the main shaft 24. The slide 75 also serves to operate bail members for locking the racks and gear pinions in inoperative position.