Patent GB-856242-A (GB)
Title: Calculating or similar accounting machines
Filed: 1959-08-31
Abstract: 856,242. Calculating- machines; transferring-machines. NATIONAL CASH REGISTER CO. Aug. 31, 1959 [Sept. 8,1958], No. 29644/59. Class 106 (1). A calculating or similar accounting-machine subtracts by a process of complementary addition and comprises a plurality of banks of keys each having corresponding differentially settable members bearing main and auxiliary zero stops, and a subtract key, which when depressed disables all the main zero stops and enables the auxiliary zero stops of the banks in which a " 9 " key has been depressed. The keyboard comprises eight rows of amount keys 1-9 each bearing a large numeral, used when adding into the totalizer, and a small numeral (the nines complement of the large except on the " 9 " key when it is " 9 ") used when subtracting from the totalizer, and a separate subtract key. Coacting with each bank is a flexible retaining slide 15, Fig. 3, a zero stopactuating plate 16, a locking detent 17, and an interlocking plate 18, through all of which the notched stem of each key passes. A zero control shaft 28, Figs. 3, 4, carries a zero stop 29 with a finger 30 projecting into the plate 16, and a yoke 31 engaging a toe 32 on stop 29 for each bank amount differential. Beneath each bank of keys 10 is a slide 45 bearing studs 46, the movement of the slide being controlled by digit keys 1-8, respectively; a stop 47 arrests the slide in its " 9 " position. The setting of the slide enters an appropriate amount in a totalizer wheel. Subtract operation.-Depression of a subtract key causes " one " to be entered into the lowest denomination and further depression of a " 9 " key registers zero (its nines complement) in the totalizer. Depression of the subtract key 11 engages and locks the plate 16 of the highest order overflow bank, thus preventing the associated zero stop 29 from moving into effective position. A yoke 31 is held between toes 32, 33, in the highest bank, and passes immediately above the toe 32 of each zero stop 29 in lower order banks, thus preventing the stop from operating. When a " 9 " key is also depressed an auxiliary zero stop-stud 160 on slide 45, Fig. 3, is engaged by a pawl 161, having a flange 163, engaging the lower end 164 of the " 9 " key and urged in a counterclockwise direction by spring means, loosely mounted on a shaft 162. Depression of a " 9 " key releases pawl 161 which is still temporarily maintained in position by an arm 166, also secured to shaft 162 by spring means. A pawl 170 having a flange 171 engaging the subtract key base 172 is also secured to shaft 162, which is prevented from rocking by a stud 181, Fig. 4, in a slot 180 of the arm 183. During an operation, cam 92 rotates moving link 183 to the right, thus releasing the arm 180 and the shaft 162, for a counterclockwise rocking movement. When shaft 162, Fig. 3, is released, a spring 162, of each key bank with a depressed " 9 " key, rocks the zero stop-pawl 161 counterclockwise to contact stud 160 on slide 45, arresting the latter in its zero position. The rocking of shaft 162 moves arms 185, 186, Fig. 4, and a tens transfer lever disc 187 bearing a stud 188 for each totalizer line engaging an arm 189 pivoted on the rod 115. Arm 189 is provided with a stud 190, Fig. 5, lying in the path of an arm 191 of the yoke 119, itself lying in the path of a flange 117 of the arm 113. Thus when arm 185 is rocked by shaft 162 the yoke 119 is drawn from engagement with flange 117, thus tipping the tens transfer mechanism of the units order, and entering the " fugitive one." Any other numbers required for subtraction from the totalizer are set up using the small numerals on the keyboard. Zero stop mechanism (addition).-A stop-pawl 29, Fig. 4, is provided for each amount differential to arrest the slide 45 in the zero position should no key be depressed. Normally pawl 29 is held ineffective by a yoke 31, mounted on a shaft 28, engaging toe 32 of stop 29 and maintained in its position by the two toes of an arm 80, the latter having a stud 82 projecting behind a finger 83 of a slide 84 which is operated through levers 89, 85 by a cam 92 mounted on the mainshaft 74. If no key is depressed the plate 16, Fig. 7, is free to move to the right, under the action of a spring 40, as slide 84 moves to the left, so rotating stop 29 to position flange 49 behind the stud 50, arresting the slide 45 in the zero position. If a key is depressed its stem holds slide 16 fixed thus holding stop 29 in its ineffective position. Tens transfer mechanism.-The carry from one wheel to the next higher order wheel is effected by moving the actuator rack 59, Fig. 5, mounted on the next higher order actuator supporting member 58, one additional step relative to member 58. When the totalizer wheel 61 is rotated from the " 9 " to the " 0 " position a long tooth of the wheel strikes a flange 121, Fig. 4, rocks a yoke 119, Fig. 5, counterclockwise, withdrawing it from contact with a flange 117 to permit a spring 116 to rock an arm 113 clockwise, away from a stud 112 on the actuator rack 59, allowing the rack to be moved by a spring 111 one step further. After the amounts have been entered into the totalizer, wheels 61 are disengaged from the racks which, together with the arms 113, are restored to their normal position. Near the end of an operation, shaft 57, Fig. 3, receives a rocking movement which allows plate 150 to engage stud 112 and restore the actuator rack 59 to its original position, and to engage stud 151 on arm 113 restoring it to its original position also.