Patent GB-518837-A (GB)
Abstract: 518,837. Calculating - machines. MERCEDES BUROMASCHINEN-WERKE AKT.-GES. Sept 6, 1938, No. 26020. Convention date, Sept. 9, 1937. [Class 106 (i)] In a calculating-machine having means for taking totals automatically denomination by denomination from both line and column totalizers and provided with a manually-operated member common to all the column totalizers for rendering active a zero stop during total taking from the column totalizers, a separate zero stop is provided for each line totalizer, each such stop being selected by its respective separate manually-operated member. General operation. The machine described has two line totalizers 12, 13, Fig. 1 (not shown) and a number of column totalizers. Items entered in certain column totalizers are added into line totalizer (12) and items entered into other column totalizers are entered into line totalizer (13). A total is taken from line totalizer (12) and the total is printed and subtracted from line totalizer (13) the new total then being taken from (13). There is a common total key for all the column totalizers and a separate total key for each line totalizer, these total keys forming also the manually-operated zero stop selecting members. The total keys may be locked by carriagecontrolled means, certain total keys being freed in certain columns. In a modification, three line totalizers, each with its own total key, are provided. Total taking from column totalizers. This occurs upon the depression of a key 21, Fig. 3 as described in Specifications 496,720 and 508,141. Total taking from line totalizers. The depression of the total key 22, Figs. 3, 5, for line totalizer (12) rocks the key lever clockwise about its pivot 90, the key lever then being latched down as described below. The bent end 99 of the key lever lifts a slide 101 to swing a bellcrank 26, Fig. 4, connected by a link 28 to an arm 31 which moves to the right a slide 35 provided with a cam slope 59 which rocks clockwise a lever 42 about 'a shaft 40. A zero stop 51a is secured to the lever 42 and is thus moved towards a stop wheel 163 having zero stop teeth 163b. There is a stop wheel 163 connected to each denomination of the totalizer and before total taking is begun the carriage is tabulated to bring the stop wheel of the highest digitholding denomination adjacent the zero stop 51a. The total key 22 also rocks a lever 129, Fig. 3, connected to a lever 134 having an end 136 which depresses a part 137 of a lever 138 whereby the lever 138 rocks clockwise to couple a clutch 143 to a rotary shaft 144 to initiate automatic total-taking as described in Specification 508,141. At the beginning of this total-taking, a shaft 52, Fig. 4, is rocked anti-clockwise to move to the left a slide 55 having a cam slope 58 which lifts the slide 35 to rock the lever 42 still further and thus to bring the zero stop 51a into the path of the zero stop teeth 163b, the totalizer pinion in the denomination in operation then being rotated, by the means described in the abovementioned Specification, to the zero position defined by the contact of a zero stop tooth 163b with the zero stop 51a. The total is subtracted from line totalizer (13) as described in the said Specification. The depression of the total key 23, Fig. 5, for the line totalizer (13) causes the end 152 of the key lever to lift a slide 153 to operate a bell crank 60, Fig. 4, connected by a link 63 to an arm 65 which moves to the right a slide 70 having a cam part 89 which rocks clockwise the lever 75 carrying the zero stop 82a for the line totalizer (13). The total key 23 also depresses a pin 130 on the lever 129, this lever' then being rocked to start the automatic totaltaking as described above. In a modification; three line totalizers are provided, each having its own total key. The total key for the additional line totalizer raises an additional link controlling an additional zero stop similar to the zero stops for the line totalizers (12, 13). The additional key also acts on an extension of the pin 130 to rock the lever 129 to initiate automatic totaltaking as previously described. All the total keys for the line totalizers are latched in depressed position by means described below (keydetent mechanism). Key-detent mechanism. The line totalizer total key 22, Fig. 3, swings about a rod 90 and has a projection 93 pulled by a 'spring 92 against a fixed bar 94. A latch lever 95 is also connected to the key by a spring 97. When the key is depressed, a hook 98 on the latch lever enters a groove 126 in the fixed bar 94 to hold the key down, the upper end 108 of the latch lever moving just beneath an extension 109 of a lever pivoted at 112 and connected to a bent lever 119 pivoted at 117. When the carriage moves a step after the total-taking is completed, a cam on a column totalizer carried on the carriage depresses a link 156 which rocks the bent lever 119 anti-clockwise and the lever 111 clockwise to lower the end 109 of the lever 111 and so rock the latch lever 95 to remove hooked end 98 from the groove 126, the depressed total key 22 then being released and the total-taking stopped. The other line' totalizer total keys are also latched and released in the same manner. Key locking mechanism. A slidable bar 193, Fig. 5, situated beneath the keyboard has a lug 193a which is normally beneath the total key 22 for line totalizer (12) and so the key is normally locked. When the carriage moves into a certain position, a cam on a column totalizer carried on the carriage engages a roller 180 on a lever 181 and rocks this lever anti-clockwise to lower a link 186 to rock clockwise a lever 188 having an end 191 engaging a cam slope 192 on the slidable bar 193, this bar thus being moved to the left. The lug 193a then moves away from the total key 22 for line totalizer (12) leaving this key free for depression, another lug 198 of the slidable bar moving beneath (and so locking) the total key 23 or line totalizer 13. In a modification, Fig. 8, the slidable bar 193 is provided with lugs 206, 207, 208, 209. Two types of cam are provided on the carriage carried column totalizers. In the normal position shown, the slidable bar 193 locks the line totalizer total key 22. When moved to the left by one cam it locks the line totalizer total key 23 and releases the key 22 and when moved to the left a greater distance by the other cam it locks both line totalizer keys 22, 23 and also by its lug 206 it locks the column totalizer total key 21. In a further modification in which three line totalizers are provided, each having its own total key, the slidable bar in its normal position leaves one of these keys free, when moved one step frees another key and locks the first, when moved two steps frees a third key and locks the first two, and when moved three steps locks all three line totalizer total keys and locks also the column totalizer total key.