Patent GB-459812-A (GB)
Abstract: 459,812. Calculating-apparatus. MERCEDES BUROMASCHINEN-WERKE AKT.- GES., Benshausen, Prussia, Germany. Dec. 3, 1935, No. 33478. Convention date, Dec. 11, 1934. [Class 106 (i)] In a typewriter calculating machine with a total - taking mechanism, the total - taking mechanism is conditioned and the total-taking operation of the machine is initiated automatically by means depending on the typewriter carriage movement. The invention is shown applied to a Mercedes typewriter calculating machine as described in Specification 438,369. The machine has eight column totalizers and two cross totalizers, the column totalizers being adjustably mounted on the typewriter carriage while the cross totalizers are displaceably mounted on a frame plate. The two right-hand totalizers are employed to receive the totals from the cross totalizers when the latter are cleared. The tabulator shaft 10, Fig. 1, in addition to the usual stops R carries special stops 11 with projections 11a adapted to co-operate with a lever 12, Figs. 1 and 3, connected by a linkage 14, 20, 22 to a slotted arm 26 in which works the screw pin 33 of a lever 32 pivotally mounted on the bifurcated arm of a lever 30. The screw pin is normally held up to the inner or rear end of the slot by a spring 35. The lower end of the lever 32 carries a pin 41 that coacts with a bell-crank 42, the lower arm of which is movable in the path of a pin 46 on an arm 48 secured to a shaft 47. This arm carries a second arm 53 to which is pivoted a forwardly extending bar 55 having a notch engaging a pin 57 on the cross total key lever 58 which corresponds to total key 329 of the machine described in the above-mentioned Specification. On the driving shaft 81 is mounted a cam disc 83 on which bears a roller 79 carried on an arm secured to a shaft 78. Another arm 77 on the shaft 78 is connected to one end of a link 74, the other end of which is connected to a bell-crank 72 on a shaft 65. This shaft carries a second arm 66 connected to a rod 68 guided by a pin 40 and having a stud 71 adapted to co-operate with the lever 32. An arm of the bell-crank 72 supports a two-part slide 86, 89 provided with a pawl end 89d engaging a ratchet wheel 104 on the carriage escapement shaft 103. When a total is taken from the cross totalizers Q<1> and Q<2>, Fig. 7, it is transmitted to the column totalizers Z<7> and Z<8> respectively ; on the movement of the carriage to the left the stop 11 by the mechanism above described swings the lever 32 against the face 42c of the arm 42a of the bell-crank 42 and tensions the spring 35 or moves directly on to the surface 42d. The depression of the appropriate tabulating key having selected the corresponding denomination of the totalizer effects in a known manner the swinging of the lever 30 thereby raising the lever 32 so that the pin 41 rides over the surface 42c of the bell-crank 42 on to the surface 42d. On release of the tabulating key the lever 30 is returned and the lever 32 depresses the arm 42a of the bell-crank 42, the lower arm of which by engaging the pin 46 rocks the shaft 47. This movement of the shaft pulls the link 55 to the left and effects depression of the total key 58 to initiate the total-taking operation which is completed as described in the abovementioned Specification. The key 58 is held depressed during the complete operation, but on the first rotation of the shaft 81 the cam 83 rocks the shaft 78 and displaces the link 74 so as to rock the shaft 65 and displace the rod 68 to restore the lever 32 to normal position. Each rocking movement of the shaft 65 is utilized also to raise the slides 86, 89 to impart a step movement to the carriage through the shaft 103 and pinion 104a. During the above described operation the total key 125 for the column totalizers is locked by means of a comb slide 118, Fig. 4. To prepare the machine for taking totals from the column totalizers, a key lever 110 is depressed to rock a bell-crank 113 and displace the slide 118 through a slide 116, the displacement freeing the total key 125. At the same time the lever 110 by engaging the end 55d of the link 55 lowers the link to disconnect the slot therein from the pin 57 of the cross total key 58. The lever 110 is held in depressed position by a manipulative latch 126. When the slide 118 is displaced as above described, the numeral keys and spacing keys 124, 124a are held against depression by the teeth 118c of the slide. The keys 124, 124a may also be locked during the operation of the cross total key 58 by providing a bell-crank 1131 as shown in Fig. 4a, the action of the key 58 being limited so as not to release the total key 125 for the column totalizers.