Patent GB-525861-A (GB)
Abstract: 525,861. Calculating apparatus. MERCEDES BUROMASCHINEN-WERKE AKT.- GES. March 2, 1939. Nos. 6838, 6839 and 6840. Convention dates. March 4, 1938, Jan. 7, 1939, and Jan. 18, 1939. [Class 106 (i)] In a typewriting calculating machine having mechanism operated by the paper carriage for controlling the fugitive one, this mechanism is automatically controlled by the tens carrying mechanism of the highest denominational order of the complementary totalizer in the machine so that when a reading is present in the negative numeral wheels the addition of the fugitive one is effected after the totalizer has left its calculating, position and when a reading is present in the positive numeral wheels the fugitive one is added prior to the entrance of the totalizer into the calculating position. The invention may be applied to a calculating machine of the kind described in Specification 496,720. The calculating mechanism is contained in a frame 51, Fig. 1, and totalizers I, II, III, and 2 slide on a rail 1 thereon. The totalizer 2 carries the fugitive one mechanism and also negative and positive numerals wheels 116 and 115 respectively, movable screens 112 and 113 being provided which permit only one set to be visible at a time. The screens are operated by a four armed lever 102 actuated by a cam 99 on the highest order calculating wheel 96. In the normal position the negative numeral wheels all show zero and the hidden positive numeral wheels, which are numbered in the opposite direction, all show nine. A plate 124 on lever 102 is also in the path of a hinged flap 84 mounted on the casing 51. In the first operation a credit amount is entered in the negative totalizer II and the totalizer 2 and typed in one column of the typewriter sheet. An old balance is now entered in the totalizer III and in totalizer 2 and also typed in another column. The new balance which has been calculated in totalizer 2 is now to be registered and typed. The movement of the paper carriage to effect this causes the plate 124 to strike lug 90 and swing flap 84 causing a lug 88 on the latter to miss a cam 74 on a lever 5 controlling the fugitive one mechanism. At the end of the movement of the paper carriage in this operation a lug 92 on flap 84 operates cam 74 and moves lever 5. At the beginning of its movement lever 5 operates a member 55 which unlocks the driving wheels of the totalizer 2. The lever 5 also raises a rod 9 which moves a lever 15 carrying a sector which drives a wheel 18 and turns the lowest order calculating wheel of totalizer 2 through one unit thus adding the fugitive one. If the lowest order wheel of the positive numeral wheels is now turned from nine to zero the other wheels are turned from nine to zero by tens transfer arrangements and the highest order wheel 96 moves the lever 102 and its attached screens 112 and 113 to conceal wheels 116 and disclose wheels 115. When the total has been taken from totalizer 2 a clear sign is typed by means as described in Specification 414,248. When this is typed the carriage return mechanism moves the paper carriage back to the right and a cam 45 on the casing strikes a roller 44 which moves a lever 43 that restores the fugitive one mechanism to its original position. In the next operation a debit amount is entered into the totalizers 1 and 2. The entry of this amount in totalizer 2 effects a change of sign and movement of wheel 96 operates lever 102 to conceal wheels 116 and expose wheels 115. Plate 124 is now moved out of the path of lug 90 and flap 84 is undeflected. Cam 74 therefore strikes lug 88 and the fugitive one mechanism is operated at an earlier stage of operations than in the previous case. A cam fiap 40 is operated by a connection with the fugitive one mechanism and thus its position is controlled by the sign of the quantity in the totalizer. This flap operates mechanism in a known manner to change the operating mechanism between subtraction and addition when required to enable a correct total to be withdrawn from the totalizer. The balance calculated from the previous entries is thus calculated in totalizer 2 and typed. Alternative constructions are given working on the same general principle but with modifications in point of detail such as by the substitution of spring operated catches for levers positively moved in both directions as in the previously described construction. The cam 99 may operate an indicator arm which shows when the capacity of the totalizer 2 is overstepped when calculating plus or minus values.