Patent GB-190228737-A (GB)
Title: Calculating or Computing Machine
Inventor: FAIRWEATHER WALLACE
Filed: 1902-12-30
Granted: 1903-04-16
Abstract: 28,737. Fairweather, W., [Shattuck Manufacturing Co.]. Dec. 30. Calculating- apparatus.-In calculating - apparatus, which may be used in combination with, or independently of, a printing-apparatus, the recording and printing wheels 16, 17 are operated by inserting, opposite a number on the face-plate, Fig. 1, a stylus or tool through the slots 11 to engage with the helical groove in the corresponding roller 10. Upon pulling the stylus towards the front of the machine to perform an addition, the spring- pressed shaft 7 is first moved longitudinally to disengage its Geneva or other stop gearing 18, 19, 20, 21 from that of the shafts a recording tower denominations, and is then rotated, while a number is subtracted by inserting the stylus opposite one of the numbers arranged in reverse order at the right of the face-plate, Fig. 1, unlocking the shaft 7 by pressing the end projecting at the back of the machine, and pushing the stylus toward the rear end of the slot 11. The separate items to be lifted or added are respectively indicated and printed by wheels 24, 25 mounted on a sleeve 23, and the totals are indicated and printed by wheels 16, 17 on the shaft 7. To allow of the item wheels 24, 25 turning with the shafts 7 at each operation and then being re-set at zero, the wheel 25 is formed with a projection 26, Fig. 8, which engages a recess 27 in the wheel 17 when the shaft is moved longitudinally by the stylus, the toothed plate 28, which normally locks the sleeve 23, being simultaneously released. The subsequent re-setting of the item wheels to zero is effected by cams 34 on the sleeves operated by projections on a plate 35 while the printing carriage is being moved back to its original position, the locking-plate 28 being temporarily released by an arm moving in a cam-slot in the rack-bar 107. During these operations, the total wheels 16, 17 remain in the position to which they have been turned until the total amount is listed, after which they may be re-set to zero by the engagement of plates operated by the fingerpieces 54 with spiral cams 49 on the shafts 7, the item wheels 25 being temporarily held clear of the total wheels 17 by a plate 56 operated by the finger-piece 58. The printing-carriage 61 carrying the paper ribbon is pivoted upon the shaft 40, and is moved forwards and back over the printing- wheels by a rotary cam-shaft 68 actuated by the rack-bar 107, the cams 87 depressing the platen 80 to make the impression during the forward movement, and tilting it into an inoperative position during the return movement of the carriage. When all the items have been listed, the platen 80 is shifted by means of the lugs 68<1> on the shaft 65 so as to bring it over the total-printing wheels 17, and the totals are printed upon again operating the rack-bar 107. The adjustment of the platen relatively to the ribbon is effected by gearing engaging with a rack formed on the plate 74 which carries the platen, and the ribbon is fed by the rollers 95. Hooks and lugs 104 normally lock the carriage in printing-position while allowing it to be turned back on the pivot 40. The removable bottom 3 of the casing 2 is provided with india-rubber feet, strips, or their equivalent 5 to prevent the machine from slipping upon the table or support.