Patent GB-190521651-A (GB)
Title: Improvements in Adding Machines.
Inventor: WELTON FRANK RANSOM
Filed: 1905-10-24
Granted: 1906-04-12
Abstract: 21,651. Welton, F. R. Oct. 24. Calculating-apparatus.-In multiple-bank adding- machines, set and actuated by selective manual operation of a recessed finger-wheel, the counting- wheels, of large size, the setting and actuating wheels, the unlocking-slides, which at the end of each actuation break connexion between the actuator and the counting-wheel, and the zeroizing-levers are all loosely mounted upon the main shaft. The transfer mechanism consists of link-work and slides always moved during the latter part of each actuation but requiring to be tripped by each tentooth. The frame consists of base, front, back, and end plates with intermediate plates 13, Fig. 7, between each pair of which a complete set of parts is mounted. A lateral flange extends from each actuating-wheel 10 beside its finger-plate 17 and bears numbers, one of which shows through a hole in a fixed superposed screen 31 at the end of each actuation to indicate the item added, other numbers upon the screen indicating the proper position for the finger in setting. When, however, the actuating-wheels are restored, the counter-wheels 8 eachshow a digit through the holes in the fixed screen.. The actuating-wheels drive through the pawl 33 and the teeth on the counter-wheels, the intermediate frames allowing the pawls to come into play just after the operator's finger moves, and uncoupling occurs when the finger strikes a lever 35, the pawl 43, Fig. 5, on which locks with a projection upon the vertical sliding plate 39, so that, as the lever is released, a spring may restore the lever, lift the sliding plate to disengage the driving-pawl, and permit a spiral spring around the main shaft to restore the actuating-wheel, which in turn restores the pawl 43 and the sliding plate. This action is, however, suspended until the operator strikes a restoring-lever and releases all the actuator detents 21. A bar 101 is mounted upon springs and extends along the back of the machine, its upper surface being provided with an india-rubber cover forming a noiseless stop for the restored actuating-wheels. The transfer mechanism is shown in Fig. 2 and consists in the main of slides 55, levers 59, and pawls 63 engaging with and carrying on the counter-wheels one step, and, as the finger-plate on the lever 35 always depresses the slide at the end of an actuation, the last movement of the counter-wheel is thus effected. The slide of the next higher wheel, also moves down whenever one of the pins 77 swings the pivoted lever 76, 70, and allows a spring-controlled dog 68, pivoted to the lower slide, to swing transversely until it is over a projection on the higher slide, so that the two slides will be depressed as one. A counterweight restores the lever so as to deflect the dog into normal position, and the carrying-pawls 63 are so shaped as to lock against the frame and prevent overflow. The zeroizing- arms 9 are feathered on the main shaft, which is rotated by spur-wheels from the zeroizing-spindle carrying an external handle, and bear pivoted pieces 45 controlled by concealed springs and adapted to sweep round and collect all the transfer pins 77. As the counter-wheels approach "0," a yoke on one of the spur-wheel spindles actuates levers to depress all the transfer slides, which have just been tripped, and thereby temporarily throw into gear all the transfer pawls to arrest the motion.