Patent GB-190820028-A (GB)
Title: Improvements in or relating to Adding Machines.
Inventor: GOLDFARB NATHAN JOSEPH
Filed: 1908-09-23
Granted: 1909-09-23
Abstract: 20,028. Goldfarb, N. J., and Drusin, A. Sept. 23. Calculating-apparatus.-In a stylus-set-and-operated adding- machine having an endless chain for each denomination passing over the adding-wheels, improvements are described in connexion with (1) the transfer mechanism, (2) the locking- means for the chains, (3) the zeroizing-mechanism and its connexion with the transfer parts, and (4) the means for giving the number of items added. Figs. 2 and 6 are sectional elevations of the ends of the machine and Fig. 8 is a perspective view of the transfer mechanism. The chains 11 run on wheels 12, 13, of which the latter carry the numbers which show through the apertures in the face of the casing. (1) The transfer mechanism is situated below the chains, and transfer is effected by a pin 16 on the wheels tripping a trigger 17 so that its notched end 26 frees the shoulder 27 of a U-shaped carrier 20, which under the action of its spring 22 moves upwards and by the engagement of its pivoted dog 23 with the chain of the next higher wheel moves it through one unit. The engagement is ensured by causing the chain to pass between a guide-plate 28 and the dog 23. The parts are returned to their initial or energized position by a carrier-setting bar 29, which depresses the carriers 20 when a bar 35 is depressed to draw down, through a lever 32, a lever 31 attached to the ends of the bar 29 ; the trigger 17 will then engage the shoulder 27 of the carrier. A pawl on the lever 32 acts as a fullstroke device to ensure a complete depression of the bar 35. A modification of the transfer mechanism is shown in Fig. 9, in which two independent triggers 58, 59 are used, the former acting as a setting-trigger and the latter as a releasiog-trigger. The pin on the wheel first strikes the trigger 58, releasing the carrier until it strikes the trigger 59 ; a further movement of the pin again releases the carrier to advance the chain of the next higher wheel. (2) To prevent over-running of the chains, a roller 38 is provided over which the chain runs and which co-acts with a roller 39 mounted on a spring- pressed arm adapted to be locked in position by a spring 20<x> on the carrier when the carrier is released. A positive lock is provided by a projection 25<x> on the trigger 17 engaging the chains when the trigger is released. Before a second actuation can take place, these locking-devices have to be released, and this is effected on depression of the carrier-setting bar 29. (3) To zeroize the number-wheels the lower chain-wheels 12 are provided with spring-pressed pawls 43 adapted to be picked up by cams 42 on the spindle 14 when the latter is rotated by the handle 50 through the gearing 45, 46, 47, 48. The pinions 47, 48 are mutilated so that a pin 51 on the wheel 48 engaging a bar 53 attached to the lever 32 can depress the bar 35 and thence reset the transfer parts before the zeroizing-mechanism is operative. A pin 45<x> on the wheel 45 engages a spring 45<y> at the zero position and so acts as a stop allowing a slight movement beyond the zero position. When the handle is released the spring moves the cams in the opposite direction to a slight extent. (4) One or more columns at the left-hand side of the machine may be used for giving the number of items added. A key 54 is used for each column and has an end 55 engaging the corresponding trigger 17, depressing it to allow its notched end 26 to move out of engagement with the shoulder 27 so that, on actuating the carrier setting-bar 29, the carrier is not held in set position by the trigger but moves forwards to drive the chain through one unit. The keys 54 are connected by a lever which allows of only one key being depressed at a time.