Patent GB-253734-A (GB)
Abstract: 253,734. Riegel, P., and Optische Anstalt C. P. Goerz Akt.-Ges. July 18, 1925. Adding and subtracting apparatus; differential mechanism.-In a key-set and independentlyoperated machine for effecting addition and subtraction by the use of reversing mechanism, and provided with two totalizers, the totalizers are symmetrically located with respect to the differential actuating mechanism, the transfer members, and the zero-stop devices. In the form shown in Fig. 1, the totalizers 31, 31<1> are mounted on shafts 33 on arms 34, 34<1> carried by shafts 35 adapted to be rocked to cause engagement and disengagement of the totalizers. In the disengaged position the totalizers are held in alignment by means of combs 70, 70<1>. The differential actuating mechanism comprises a toothed sector 11 pivoted on a main shaft 1. a pair of pinions 50, 51 on a laterally displaceable shaft 54, Fig. 3, and an arrangement of gear wheels 53, 56, associated with the pinion 50. and another set of gear wheels 62, 63, 56 associated with the pinion 51 for addition and subtraction respectively, the shaft 54 being displaced to permit one or other of the pinions 50, 51 to engage the sector 11. The sector 11 is connected by a spring 12 to a. bell-crank lever 5 adapted to follow the movement of a frame 2 on the actuation of the main operating mechanism, the extent of movement being determined by the stop of the depressed key limiting the movement of the differential bar 10 connected by a pin-and-slot connection 8 to the bell-crank lever 5. On the return movement of the operating parts the sector 11 is returned until a pen 15 thereon engages the end 16 of a bell-crank lever 17. In a modified form shown in Fig. 5, the sector 11 gears with a toothed wheel 53a and a reversing gear comprising a frame 94 and pinions 62<a>, 63<a> is provided for effecting addition and subtraction through the gearing 62a, 51a, 52a or 63<a>, 52 to the toothed wheel 56<a> actuating the totalizer. In another construction shown in Fig. 7, the sector 11 is replaced by a bell-crank lever, one arm 11<a> of which is pivoted to a bifurcated member 107 carrying racks 108, 109 for engagement with a pinion 110 geared with the wheel 56. The engagement of one or other rack is effected by a two-armed lever 116 having a cam set 104 engaged by a pin on an arm 102 of the reversing shaft 101. Transfer mechanism. - Additional movement of the sector 11, Fig. 1, is permitted to effect the carry-over to the next higher denomination by displacing the end 16 of the lever 17 out of the path of the pin 15. The transfer tooth 30 is adapted to engage a nose 29 on a member 27 pivoted on the shaft 28 so as to rock the member 27 in either direction, and by means of a pin 26 thereon to rock a member 22 to free the projection 21 thereon from a projection 20 on the lever 17, which, by means of the spring 19, is turned clockwise to lower the end 16. The lever 17 is restored on the subsequent operation of the main operating mechanism by a bar 82, and the members 22, 27 resume their normal positions under the action of the spring 24. In the form shown in Fig. 5, the transfer tooth 30 by engaging a projection 29 on a member 92 rocks the member so that another projection 25<a> thereon moves out of the path of a projection 22<a> on a member 22, which is thereby rocked to free the end 20b of an arm 20<a> integral with the lever 17. The member 22 is provided with an extension 22b which is engaged by the arm 20<a> when the lever 17 is restored to reset the member 22. A spring- controlled lever 90 on the shaft 23 is utilized to return the member 92. In the construction shown in Fig. 7 the transfer tooth is adapted to rock a star-shaped member 92a with arms 120, 121, either of which, through engagement with a roller 100 on the member 22, rocks the member to free the arm 20<a> and lever 17. Printing totals.-In total-taking operations, with any one of the above-described forms, a shaft 40 carrying a series of stop members 41, each with zero stop teeth 42, 42<1>, Fig. 1<a>, is adapted to be rocked by depression of the total key to position one or other of the teeth into the path of the stop teeth 43 of the totalizer pinions.