Patent GB-191508119-A (GB)
Title: Improvements in and relating to Total Taking and Printing Mechanism of Adding and Subtracting Machines.
Inventor: HADDAN ALFRED JOHN HENRY
Filed: 1915-06-01
Abstract: 8119. Haddan, A,. J. H., [National Cash Register Co.]. June 1. Adding and subtracting apparatus with several totalizers; cash registers with operating-means.-A machine particularly applicable to checking receipts in hotels has a number of department totalizers and and a grand totalizer, the items entered upon one of the department totalizers for provisions returned being automatically subtracted from the grand totalizer. Operations for indicating and printing totals and sub-totals from the grand totalizer or either of the department totalizers are controlled by a total-lever 72, Fig. 1, which, in its neutral position, allows ordinary adding or subtracting operations. The printing, totalizer-selecting, transfer, and differential mechanisms described in Specifications 100,568 and 100,569 are employed. As the printing of totals and sub-totals is obtained by driving the totalizers backwards by means of the differential members until arrested by the transfer stops, two rotations of the main shaft are required in these operations, and the driving-mechanism, of the type described in Specification 17,534/08, is automatically controlled to ensure this. Keyboards; keyboard interlocks.-The machine has amount-banks 68, Fig 1, a transaction bank 70, and waiters'-number bank 69 ; the amount and transaction keys are released after each operation, but the waiters' keys are held depressed for a succession of operations until a special release key is operated ; this special key will not release the machine and cannot be depressed while the machine is operating. In ordinary operations, a transaction key cannot be depressed until a waiters' key has been operated, and the machine is not released until a transaction key has been depressed. The differential mechanism employed is of the type in which constant-excursion driving-members are latched to the differential members 283, Fig. 4, and drive them on the outstroke until the latches 289 encounter the key stems and are released ; on the return stroke, the differential members are picked up again and actuate the totalizers. The driving-members are driven by staggered cams to facilitate transfer. The amount keys 68 co-operate with detents 79 and locking-plates 80; the detents are supported by arms 82, 83 and the locking-plates by arms 84, 85, all these arms being pivoted by pins 87 on the key frames 73. Each detent temporarily retains the keys in depressed position and operates a zero stop-pawl 88, pins 89 co-operating with shoulders 90 on the keys. The supporting-arms 84 for the locking-plates 80 have extensions 97 operated from a shaft 100, which is rocked on the depression of a transaction key. Similar detents and locking-plates are provided for the other banks. Printing totals and sub-totals.-Total operations are controlled by a lever 72, Figs. 1 and 25, which is connected to a cam-plate effecting the various releases and interlocks required. This lever has five positions, the central one of which is for normal transactions of the machine ; the extreme positions are for transaction and grand totals respectively, and the intermediate positions are for transaction and grand sub-totals. The machine is released by the movement of the total lever for grand-totalizer operations, but is locked against operation when this lever is not in one of the five positions ; and the waiters' and amount keys are locked when the total lever is out of its central position. The controls are effected through a shaft 217, links 246, and cam-slot 248 in the case of releasing the machine for grand-totalizer operations at the extreme positions of the total lever 72. The locking of the keyboard is controlled by a cam-slot 241, and the locking of the machine for intermediate positions of the total lever is controlled by a cam-track 270. During the first rotation of the main shaft in total operations, the tripped transfer devices are restored, and one of the totalizers is moved into engagement with the differential members ; during the second rotation, the engaged totalizer elements control the extent of movement of the differential members, and thus the setting of the type members. As the waiters' keys are not employed in total operations, their associated typecarriers are employed for other purposes ; the typecarriers of the units and tens banks are set for the highest denominations of the total, and additional type on the hundreds type-wheel of the waiters' banks print the nature of the total operation. The zero stop pawls of all the banks of amount and waiters' keys are thrown out of action during the first revolution in a total operation.