481,127. Cash registers. NATIONAL CASH REGISTER CO. Sept. 7, 1936, No. 24357. Convention date, Sept. 7, 1935. [Class 106 (i)] In a cash register or similar accounting- machine having differential mechanism associated with the overflow wheels of the totalizer, which differential mechanism is controlled in adding operations by keys to print and/or indicate non-additive data and in total-taking and sub-total-taking operations is controlled by the overflow wheels to set up the total, the totalizer actuator for each overflow denomination is normally coupled to its associated differential arm, but becomes uncoupled therefrom in adding operations. The invention is described as applied to a machine of the kind forming the subject-matter of Specification 8119/15, [Class 106 (i)], and consists in that the usual differential devices that, in total-taking operations, serve to set the type-wheels and indicators under the control of the overflow pinions of the totalizers, now serve, in adding operations, to set the type-wheels and indicators under the control of banks of keys for non-additive data. For this purpose the usual actuator 88 is connected to the usual differential arm 50 by a latch 93 that is pivoted by a stud 200 to the actuator and takes over a pin 94 on the arm. In total-taking operations, the actuator is rigid with the arm and sets the latter under the control of the associated overflow pinion 92 of the selected totalizer in usual manner. In adding operations, however, the latch 93 is disabled by the engagement of its stud 125 with a hooked arm 124 after one step of movement. Thus, while the differential arm is set under the control of the depressed key, the actuator is restrained and thereby prevented from adding the amount into the overflow wheel of the engaged totalizer or totalizers, but due to its step of movement is still capable of effecting transfer in usual manner. A spring- urged arm 150 bears beneath the stud 125 to hold the unlatched actuator against counterclockwise movement in operations in which transfer occurs to the overflow pinion of the selected totalizer of all three lines simultaneously. The hooked arm 124 is controlled by the usual shaft 110 that is rocked in total-taking operations, the connections including toothed sectors 117, 118, cam slot 120, stud 121, arm 122 and shaft 123. Specification 199,046, [Class 106 (i)], also is referred to.