Patent GB-252101-A (GB)
Abstract: 252,101. Rudin, K. V. July 15, 1925. Adding and subtracting appparatus; transfer mechanism.-A totalizer adapted for addition or subtraction by the swinging of intermediate pinions out of and into action is provided with transfer mechanism of a known kind 'which may be positioned, for subsequent operation, by transfer teeth on the totalizer pinions or on the intermediate pinions according as the totalizer is conditioned for positive or negative actuation. The totalizing-counter comprising numeral wheels 15 and receiving pinions 14 may be driven in one direction or the other from the transmitting pinions 2 (gearing with the actuating racks 1) either directly for addition or indirectly through pinions 17 for subtraction. The counter and the pinions 17 are mounted on a frame pivoted at 10 to rocking arms 4 carrying the pinions 2, and by means of two keys 18, 19, Fig. 5 the frame can be shifted for the direct or indirect drive. Depression of either key effects through a pin 68 or 69 an oscillation of a member 65 pivoted coaxially with the rocking arms at 6 so as to cam up or down a bifurcated lever 60 connected with one of the frame journals. Adjacent to each pinion 2 is a transfer pinion 20 of similar size and pitch but with alternate teeth removed. When a transfer occurs with the counter in additive position, as shown, a transfer tooth 23 secured to the lower numeral wheel displaces the wheel 20 lying alongside the transmitting pinion 2 of the next higher denomination. This displacement brings a tooth of wheel 20 within range of an arm 33 of which there are several disposed spirally around a shaft 30. Thus subsequently in the operation of the machine and after the counter has been raised out of its position of actuation, Fig. 3, the shaft 30 is rotated and the wheel 20 turned through the remainder of its intertooth space. This movement is transmitted to the adjacent pinion 2 and so to the next higher numeral wheel by means of a coupling member 36 capable of rocking motion on its shaft 37 as limited by a pin and slot 39 and possessing two broad teeth 35 bridging the contiguous wheels 2, 20. Overthrow in the transferinitiating action is prevented by providing each arm 33 with a shorter arm 76 which in the lower position of the counter projects into the space between the teeth on wheel 20. Overthrow in the actual transferring operation is prevented by contact of an arm 46 secured to shaft 37 with a pin 47 carried by one of the counter-supporting arms 4 and serving to restore the shaft when the counter is next lowered. Alternatively a fixed projection 77 may be disposed so as to act as a stop to the wheel 20 when this is in its upper position. Detents for the various wheels &c. are provided, namely 24 for wheels 20, 42 for the coupling members 36 and 50 for the numeral wheels. The last-mentioned detents 50 are mounted with limited movemnt on the shaft 51 and are positively removed from engagemnt with the counter when this is in its lower position by means of an arm of the shaft co-operating with a shaped abutment. The action of transfer when the parts are set for subtraction is the same as described above but the initiation is then effected by transfer teeth 49 provided on the intermediate pinions 17 instead of by the teeth 23.