Patent GB-228923-A (GB)
Abstract: 228,923. Continentale B³ro-Reform J. Bergmann Ges., (Assignees of Toggenburger, H.). Feb. 5, 1924, [Convention date]. Adding and subtracting apparatus.-In a differentially set and independently operated machine in which subtraction is effected by the addition of the complement, the setting segments are provided with circular racks and the totalizer is adapted to be rocked into engagement therewith on the return of the segments to normal position. The segments are formed of a comparatively large radius with two sets of complementary rows of digits for setting and indicating purposes respectively and are so arranged as to accommodate the trip devices of the transfer mechanism. The segments 3, Figs. 2 and 3, are pivotally mounted on a shaft 2 and have two sets of numbers as shown, the opposing numbers being complementary except in the case of the units denomination. The segments are extended to form racks 5 for actuating the totalizer pinions 6 when the frame 8 carrying the shaft 9 is rocked to effect the engagement thereof and the return of the segments to normal position. The rocking frame 8 is pivoted to a shaft 10 and has pivotally supported thereon a shaft 11' carrying a cam 11 bearing on a roller 13 on the machine casing. Movement of the frame 8, by means of a rod 16<1>, withdraws the retaining pawls 16 from engagement with the locking teeth 15 on the racks 5. Return'of the segments is effected by a bail 3 to which is pivoted a bar 40 having an extension which lies in the path of movement of a pin 42 on a cam 30 on the shaft 11<1>. To ensure a complete rotation of the main crank, a pawl 44 is adapted to co-operate with a ptn 46 on the cam 11. This pawl is freed on the movement of a segment by a bar 45 connected to the pawl 44. In performing subtraction a lever 47 is pulled forward in a cam slot 53 so as to move a slide to cover the ordinary setting figures on the segment and to expose the complementary series. Transfer mechanism.-Each numeral wheel 6 has a pin 20<1> which is adapted to effect the release of a trip lever 23 so as to be free of the projection 54 on the transfer actuating bell-crank lever 25 mounted on a shaft 27 slidable in slots in the frame 8. The levers 23, 25 are connected by a spring 28. Raising of the shaft 27 to cause engagement of the teeth on the arm 29 of the lever 25 with the totalizer pinion 6 is effected by a pair of pivoted levers 31, Fig. 1 which, at their opposite ends, support the shaft 27 and engage the cams 30 on the shaft 11<1>. After engagement in this manner a spring-controlled rod 31', that extends across the ends of the levers 25, is raised by a pair of cams 32 on the shaft 11<1> to permit the rocking of the lever 25 to advance the next higher pinion one unit. The pins 31<1> serve also to restore the transfer actuating member and trip lever to normal position. Operation and item counters.-To count the number of adding operations a counting mechanism, comprising two numeral wheels similar to those of the totalizing-counter, is mounted on the shaft 9. The units wheel is actuated at each operation by a mechanism similar to that for effecting the transfer operation. A pivoted lever 47 has attached thereto a link 49 that is connected to a slide provided with an extension 54 and movable along the lever 25. In the central position shown in Fig. 5 the counter is not actuated since the projection is always in engagement with the tail end of the trip lever 23. If the lever is moved to the position " I " for addition, the lever 25 is tripped and at each operation the counter is actuated. In the position " II " for subtraction the projection 54 remains in engagement with the trip lever. With printing mechanism; printing totals.-To print, the items set up the segments co-operate with type bars 57, Fig. 7, from which an impression can be taken by means of a platen 60 adapted to be rocked into contact therewith. In printing a total, a member not shown is provided to release the pawl 44 and the main crank is operated to throw the totalizer into engagement whereupon a spring 60<1> pulls the segments forward until the transfer pin 20<1> engages the end of the trip lever.