Patent GB-365058-A (GB)
Abstract: 365,058. Adding and subtracting machines. MERCEDES BœROMASCHINEN - WERKE AKT.-GES., Benshausen, and POTT, F., 12, Reissmannstrasse, both i n Mehlis, Zella, Thuringia, Germany, Oct. 9, 1930, No. 30252. [Class 106 (i).] In a calculating machine, items are transmitted from differentiallv-moved shafts to the totalizer shafts through coupling pinions arranged on a rotatable bar disposed perpendicularly to the differential and totalizer shafts. Keys, keyboards. - The keys comprise rectangular upper parts 5, Fig. 2, from which two legs depend through slots in the key frames, the legs being connected by pins 19. The keys are maintained in their raised position by springs 14 and when depressed are locked down by the engagement of the pins 19 with recesses 106 in spring- controlled looking bars 23. The bars 23 are moved by a bail both upon the depression of an error key and at the end of an operation. Displaying items.-The pins 19 act also upon bars 29 connected to sectors 31 bearing numerals visible through an aperture. Differential mechanism.-In addition to the bars 23, 29, four bars 24 .. 27 and a bar 28 are situated beneath each denominational bank of keys. The bars 24 .. 27 engage pinions R5 .. R2 slidably mounted on square shafts 34 and situated above rack bars Z0 .. Z9, Fig. 7. The bars 24 .. 27 engage with the pin 19 and move one of the wheels R2 .. R5 into engagement with one or other of the two adjacent rack bars. The pinion R1, corresponding to the numeral " 1," is normally engaged with the rack bar ZO and is displaced one step to the left by the bar 28 when any key other than the " 1 " key is depressed. When the latter key is depressed the pinion is displaced two steps into engagement with rack bar Z1. The addition key 1, Fig. 10, when depressed rocks a lever 117 connected by a link 119 and a lever 121 to a shaft 120 which then turns in a clockwise direction and by means of a lever 123 slides a bolt 125 to the right to lock rack bar Z0. The rack bars are pivoted to a cross-bar 40 connected by a rod 41 and link 42 to a crank 44. The bars are then swung an amount proportional to their distance from the fixed bar Z0. In subtraction the key 2 is depressed, the bar Z9 then being fixed. The operation of the crank 44 now causes the rack bars to move distances complementary to those moved when the bar Z0 was fixed. Since the pinions R1 in those denominations in which no setting has been made are in contact with the bar Z0, in a rotated a distance corresponding to the numeral nine. Transmission of values to totalizer. The operating shaft 43 is connected by gearing 166, 203 to a shaft 84 at the end of which is a wheel 204 gearing with a wheel connected to a disc 207, Fig. 3, carrying driving teeth 208 and a locking surface 209 and engaging a mutilated pinion 210 fixed to a shaft 211 integral with a rotatable frame 214 in which are pivoted transmission pinions 215. In the position of rest, these transmission pinions are in gear with pinions 45 on the shafts 34 but are disengaged from pinions 54 on the numeralwheel shafts 47. At the commencement of an operation the rotation of the shaft 84 causes the pins 208 to rotate the pinion 210 and frame 214 until the pinions 215 engage both gears 54 and 45. The value set is then transmitted to the totalizer while the frame is held locked by the engagement of the member 209 with a surface 210a. The frame 214 is then moved so that the pinions 215 are disconnected from both pinions 45, 54 while the rack bars are returning to their zero positions and finally the pinions 215 are engaged with the lower pinions 45. During the movement of the frame the transmission wheels are prevented from rotating by engagement with a locking comb 217. In a modification, the movement of the frame is effected by a cam driven from the shaft 84 and having a follower carried by a spring-controlled lever secured to the frame 214.