Patent GB-473352-A (GB)
Title: Improvements in or relating to calculating machines
IPC: G06C7/10
Filed: 1936-01-06
Abstract: 473,352. Calculating - apparatus. BILDE, T. E. D. Jan. 6, 1936, No. 447. Void. Convention date, Jan. 4, 1935. [Class 106 (i)] Adding and subtracting apparatus.-The differential actuators and totalizer wheels of a calculating-machine are mounted on the same axis, the actuator and wheel of each denomination being situated adjacent one another. The invention is of general application, but is described as applied to a machine of the tenkey type having keyboard and differential mechanisms of the kind forming the subjectmatter of Specification 473,265. As shown in Figs. 1 and 11, the actuators 1 and totalizer wheels 2 are freely mounted on a common shaft 3, the actuator and wheel of each denomination being separated by a transfer pinion 41 rigid with the wheel. Each totalizer wheel may be selectively coupled to its associated actuator, for rotation in positive or negative direction, by one of a pair of pawls 12, 13 pivoted on the actuator and capable of engagement with the teeth of the wheel. The effectiveness of each pair of pawls is controlled by a sector 15, Fig. 6, the cam-shaped edge of which co-operates with pawl 12 while its studs 38, 39 co-operate with the cam-shaped edge of pawl 13. In the position of the parts shown in Fig. 6, the subtraction pawl 13 is operative to communicate the forward counterclockwise movement of the actuator to the totalizer wheel, the pawl being so shaped that during the return movement it wipes idly over the teeth of the wheel being incapable of overcoming a spring-urged aligning pawl 43. Conversely, in an adding operation, the pawl 12 becomes effective to transmit the clockwise but not the counterclockwise movement of the actuator to the totalizer wheel, while in non-add operations both pawls are ineffective. In total-taking operations, the subtraction pawl 13 is engaged and the actuator and totalizer wheel rotate until arrested by the transfer tooth. The return movement of the pawl is idle and leaves the totalizer wheel in zero position. In subtotal-taking operations, however, the subtraction pawl is held in positive engagement with the wheel by stud 39 so that the wheel is returned to its initial position. The control sectors 15 are restored to adding position at the end of each operation and receive their new setting at the beginning of a succeeding operation under the control of a bank of operation keys 20, Fig. 3. Depression of an operation key differentially rotates a shaft 23 carrying a roller 27, Figs. 1 and 3, that is thereby positioned in the path of one of a series of stepped grooves in a member 31 supported by the cranked end of a shaft 17. At the beginning of an operation, the shaft 23 is moved longitudinally to enter the roller 27 in one of the grooves and thereby position the member 31 and shaft 17. A bail 18 mounted on the shaft 17 is thus rotated into engagement with tails 19 of the control sectors 15 which are thereby set in accordance with the depressed key. Continued movement of the shaft 23 is transmitted through a rack 9 to the shaft 3 and thus through springs drives the actuators. Transfer mechanism. At transfer, a tooth 42, Fig. 10, of the transfer pinion 41, rigid with the totalizer wheel 2, rocks a lever 44 counterclockwise thus raising a telescopic extension 90 of a lever 100. Upon the return of the actuator 1 of next higher denomination, a pin 89 thereon enters a notch 92 in the extension 90. Immediately thereafter, the lever 100 receives a counterclockwise and clockwise rocking from a cam 102, which rocking is transmitted to the actuator and, according as to which coupling pawl 12, 13 is engaged, rotates the associated totalizer wheel one step additively or subtractively. In total and subtotal operations, the transfer levers 44 are locked by a bail 54 of the shaft 17 to enable them to act as stops for the transfer teeth.