Patent GB-484095-A (GB)
Abstract: 484,095. Calculating-machines. BURROUGHS ADDING MACHINE CO. Oct. 29, 1936, No. 29444. Convention date, Oct. 30, 1935. Addition to 450,591. [Class 106 (i)] A calculating-machine having two totalizers, the first of which positions settable stops to control feeler members connected to the second totalizer whereby totals may be transmitted from the first totalizer to the second as described in the parent Specification, is now arranged so that the stops may control the feeler members either in accordance with the total on the first totalizer or in accordance with the complement of this total and thus the total on the first totalizer may either be added to or subtracted from the amount in the second totalizer. Means as described in Specification 453,495 may be provided for suppressing the digits in the three lowest orders of the amount transmitted from the first to the second totalizer. Entering amounts in first totalizer. The depression of an amount key 10, Fig. 1, starts the motor to enter the corresponding digit into the first totalizer 46 in known manner. Additive transmission of total from first to second totalizer. Each wheel of the first totalizer 46 carries a snail cam 61 which, through a lever 64 and link 68, rocks a member 74 about its pivot 73. Steps 75, Fig. 5, in the member 74 are thus positioned to co-operate with links 78 which control the second totalizer 51 as described in the parent Specification. The transmission occurs upon depression of a key Tr, Fig. 2, which moves a bail 95 to the left to close the motor switch and engage a one-revolution clutch 114a. The key also rocks clockwise a lever 87 to pull a link 89 to the left to release the transmission mechanism. Subtractive transmission of total from first to second totalizer. This is effected when a finger lever 120, Fig. 2, is rocked clockwise about its pivot 121. The finger lever has an arm 122 with a cam slot 123 which rocks clockwise the lever 87 to move the slide 95 to the left and link 89 to the right to condition the machine for total transmission and start the motor. Another cam slot 129 of the finger lever 120 lowers a bail 131 which then engages on forks 117 of the links 68, Fig. 1, and causes these links, through a pin and slot connection 70 to rock the members 74 clockwise so that complementary steps 76a are in the path of the ends 77 of the links 78 controlling the second totalizer 51. If the finger lever 120 is moved too rapidly, a light spring 136 connecting a check lever 135 to the lever 120 extends and the check lever blocks an arm 132, 138 carrying the bail 131 and thus locks the finger lever. This is to ensure that the members 74 are positioned before the total transmission commences. The steps 76a are complementary with respect to nine with respect to the corresponding steps 75, excepting in the units denomination, where the complements are with respect to ten. Suppression of lower-order digits during transmission. This occurs when a key 140, Fig. 6, is depressed. The key is shown depressed and has yieldably pivoted to it a lever 149 engaging a pin 150 on a bell-crank 151 which rocks a bail 153 from position A to position B. The bail 153 passes through the forked ends of three levers 154 which are thus moved anticlockwise to bring their ends 156 in the path of pins 157 on the three lowest links 78 to prevent movement of these links. Transmission of the digits standing on the three lowest wheels of the first totalizer is thus inhibited. When a subtractive transmission is made with the key 140 depressed, it is necessary to move the link 78a, Fig. 7, of the fourth order a distance complementary with respect to ten to the digit on the corresponding wheel of the first totalizer, since the fourth order is now the lowest order concerned in the transmission. To this end the fourth order link 78a has a slide 160 normally held against a spring action by a latch 162 and adapted to engage the steps of the member 74 by its end 77a. When the key 140 is depressed the pin 150, Fig. 6, is in the path of a lever 171 pivoted at 142. If the subtractive transmission finger lever 120 is now depressed the bail 131 is lowered and rocks the lever 171 which moves the bail 153 to the position C. A lever 154a, Fig. 7, is thus rocked so far that its arm 169 releases the latch 162 so that the slide 162 moves with respect to the link 78a through one step of movement, thus causing complements with respect to ten to be transmitted. Interlocks. If, when the key 140 is in its raised position, the subtractive transmission finger lever is moved, the arm 171 moves under the pin 150 to prevent action of the suppressing mechanism should the key 140 now be operated. The lever 120, Fig. 2, is locked by the pin 124 entering the cam slot 123 when the additive transmission key Tr is depressed. Specifications 314,789, [Class 106 (i)], and 450,533 also are referred to.