Patent GB-190913416-A (GB)
Title: Improvements in Adding and Subtracting Machines.
Inventor: SCHOOLING WILLIAM
Filed: 1909-06-08
Granted: 1910-06-02
Abstract: 13,416. Schooling, W., and Fiennes, C. W. T. Wykeham-. June 8. Adding and subtracting apparatus.- In a key set lever-operated machine, an additional wheel is provided in the totalizer train of wheels for each denomination, which, when a subtraction is to be effected, is adapted to be brought into gear with the actuating- racks. After setting an item, a rotation of the main handle effects in turn the engagement of the totalizer trains with the setting-wheels which are permanently in gear with the rackbars, the clearing of the racks to zero, the disengagement of the totalizer the transfer in the totalizer, and the disengagement of totalizer and transfer mechanism. A side elevation of the machine is shown in Fig. 2. Modifications are described in connexion with the keys and setting-mechanism, the mounting of the frame for and the totalizer mechanism, the transfer parts, and the zeroizing-mechanism. Keyboards ; differential mechanism; totalizing- counters.-The setting-wheels a, Fig. 1, under the control of springs in the casings d gear with racks b held in the normal position by stops h mounted on pivoted bars i. The racks b are provided with three steps e, f, g, and their movement is determined according to the key depressed by stops n on the keys m. The keys move in guides p and are held in either the normal or depressed position by spring balls engaging recesses q in the keys. The racks b are returned to the zero position in order to transfer the items to the totals mechanism by means of segments u, Fig. 2, engaging through a mutilated pinion x a rack y mounted on a bar z, the ends of which engage stops 2 on the racks b and return them to zero. The pinion x is brought into gear with the segment u by the side teeth 4, 5. The keys m are returned to normal position with the racks by a roller 6 moving the bar i, when the spindle 8 is rotated by the arm 10 and the pin-andslot connexion with the bar 2. The totalizer comprises a series of adding-wheels 13, gear-wheels 15, and numeral wheels 16. The adding-wheels 13 are adapted to be brought into gear with the wheels a when adding, and an additional subtraction wheel 20 engaging the wheel 13 is adapted to gear with the wheels a when subtracting. The totalizer is mounted in side frames 24 which can be lowered or raised by an adding-key or subtracting key connected by bell-crank levers and links thereto to bring the wheels 13 or 20 opposite the setting-wheels a. To bring the wheels 13 or 20 into engagement with the wheels a, the frames 24 are connected by screws 35 to frames 42 connected by a link 40 and pin 39 to the cam groove 38 in the disks v actuated by the handle. Transfer mechanism.-A single tooth 45 on each of the wheels 13 or 20, Figs. 1 and 4, engages one of the two teeth 46 of the pinions 47, which are rotated a half-revolution ; when the wheels 13 or 20 are disengaged from the setting-wheels a, a second pair of teeth 51 on the pinions 47 rotate the next succeeding wheel 13 or 20 through a unit. The pinions 47 are rotated by disks 49 with teeth 48 arranged to actuate the pinions successively from left to right, and with teeth 48<a> to actuate from right to left to effect any additional carrying that may be required. The spindle 50 carrying the disks 49 is rotated by a segment 59 on the disk v through gear-wheels 60, 63. The wheel 60 is rotated by side teeth to make engagement with the segment 59. The pinions 47 and disks 49 are mounted in a frame 53 moved into engagement with the setting-wheels a by cam-grooves 54 with engaging pins 55 carried by links connected to the frame 53 by bolts 57 adapted to move in slots in the side frames. Zeroizing-mechanism.-To zeroize the numeral wheels, mutilated pinions 21 are arranged to engage mutilated pinions on the numeral wheels.