Patent GB-191013769-A (GB)
Title: Improvements in Calculating Machines.
Inventor: EDMONDS SAMUEL OWEN
Filed: 1910-06-07
Granted: 1911-02-09
Abstract: 13,769. Edmonds, S. O. June 7. Adding-apparatus with operating - mechanism ; k e y b o a r d s . - Relates principally to transfermechanism for calculating machines of the type described in Specification 8820/08. The keyboard mechanism is similar to that described in the above-mentioned Specification, the depression of a key causing a bar 3 to move towards the front of the machine, through a distance depending on the key depressed. Pivotally connected to each of the bars 3 is an arm 9 provided with a pawl 8, which rides over the teeth of the gear-wheels 7 when the bars 3 move to the front of the machine. An operation of the main handle 6 through the operating- arms 11 returns the arms 9 to the normal positions, and thereby actuates the numeralwheels 47 through the wheels 7. Transfer mechanism.-The operating-arms 11 are connected together by a rod 12, and each is provided with a pivoted carrying-member 14, having a latch or holding-device 15 for the carrying-member, held in the position shown in Fig. 3 by the spring 17, and with a projection 23 adapted to engage a projection 24 on the arm 9. Overthrow of the arm 9 is prevented by a depending projection 28 which is on a member 26 mounted on a shaft 25, and lies in the path of a lateral projection 29 upon the arm. The member 26 is adapted to be displaced to allow an additional movement of the carrying-member 14, and consequently of the arm 9, when. a transfer is to be effected. In the displaced position, a projection 35 on the member 26 frees the holding-device 15, so that the projection 18 of the carrying-member, when it engages the spring-controlled arm 20, moves in the slot provided in the arms 11. Normally the levers 20 are simply raised against the action of their springs, the carrying-member being locked by the holding device; but when a numeral wheel passes from 9 to 0, a cam 49 upon it actuates a bell-crank lever 50, the end of which engages a lever 56 mounted on a pivoted member 53 which is thereby rocked. A projection 54 on the member 53 engages the lateral projection 35 on the other member 26, so that this is displaced and retained in this position by a latch 31; the member 53 is free to return under the action of its spring. To prevent overthrow when the additional movement is effected, the end 30 of the arm 9 engages a collar on the shaft 25. To release the member 26, the latch 31 is provided with an extension arm 39, which is pivoted to a lever 40 having a pin engaging a cam-slot in a sector-shaped piece 42 on the main shaft, Fig. 6. The lower end of the lever 40 is attached to a bail 43 provided with a number of detents 45, one for each of the wheels 7, disengaged when the machine is operated. Zeroizing - mechanism. - To zeroize the numeral-wheels, a handle upon the numeralwheel shaft 46 is moved longitudinally and is then rotated, whereupon recesses in the shaft engage spring pawls carried by the numeralwheels. It is further necessary to withdraw the detents 45, and for this purpose the main operating-handle is moved slightly by a conical surface 60 upon the numeral-wheel shaft during the longitudinal movement thereof, but when the shaft has come into the position for rotation it is impossible to move the operating-handle. The numeral-wheel shaft is locked, when in its normal position, by means of a pin upon the framework.