Patent GB-791715-A (GB)
Abstract: 791,715. Calculating-apparatus. BRUNSVIGA MASCHINENWERKE AKT. - GES. Jan. 23, 1956 [April 23, 1955], No. 2201/56. Class 106 (1). In a ten-key machine comprising a settable rotatable actuator, a totalizer and a revolution counter to the right of and coaxial with the totalizer, the actuator being shiftable axially relatively to the totalizer and revolution counter, means are provided for automatically returning the actuator into a normal position opposite the revolution counter, following a back transfer from the totalizer to the actuator. The invention is applied to the cam disc and pin wheel machine described in Specification 736,097, which machine comprises control keys 25, 26, 27 and 28 adapted to cam respective slides 31 to the right, lugs on these slides causing selective engagement of gears 45-19 with respective companion gears 61-65 for effecting individual machine operations. Movement of a slide 31 also transfers the drive of the handle 1 from the rotor 4 to the shaft 43 of the gears 45-19 so that, upon rotation of the handle after depressing one of the control keys, the corresponding operation is executed. As regards key 25 this consists in zeroizing the rotor 4, by means of wheels 22, and shifting the rotor carriage into position for transferring back from the totalizer (not shown) to the rotor. Key 26 also zeroizes the rotor 4, and causes restoration of the rotor carriage into its initial position opposite the revolution counter (not shown). Keys 27 and 28 are adapted, respectively, to zeroize the totalizer and revolution counter. The invention provides a combination key 90 adapted to move all four slides 31, so that rotation of the handle 1 causes the totalizer and revolution counter to be zeroized, the total to be entered on the rotor and the rotor carriage restored into its initial position. The total can then be entered on the revolution counter to serve as a multiplier. Additional mechanism is, however, provided by which the rotor carriage can be automatically released for leftward movement, as the handle 1 and shaft 43 complete their rotation, and the carriage arrested in position for the total to be re-entered into the totalizer as a multiplicand. This mechanism includes a cam 124, Figs. 3 and 4, adapted to rock a bell-crank 125 and lift an arm 1201 of a carriage control member 120 pivoted about a shaft 121. A pivotally mounted rail 97 extends along the carriage track and is adapted to trip the retaining pawl 74 of the carriage. The arm 1201 rocks the rail 97 and so releases the carriage for leftward movement by its spring 5 until arrested by a stop arm 120<SP>11</SP> on the member 120. Correct denominational positioning of the rotor relatively to the totalizer is determined by denominational stops (not shown) incorporated in the rotor and interposed by set cam discs between an end stop 126 on the rotor and the stop arm 120<SP>11</SP>. To disable this mechanism, when it is desired to transfer the rotor setting to the revolution counter, a lever 127, Fig. 9, is rocked counter-clockwise, an edge 129 of the lever camming the member 120 leftwardly against a spring 122 so that the arm 120<SP>1</SP> moves clear of a lug 97<SP>1</SP> on the rail 97 and does not, therefore, rock the rail to release the rotor carriage.