Patent GB-712732-A (GB)
Title: Accounting machines and similar calculating machines
IPC: G06C11/02
Filed: 1952-11-06
Abstract: 712,732. Accounting-machines; calculating-apparatus. NATIONAL CASH REGISIER CO. Nov 6, 1952 [Dec: 3, 1951], No. 27936/52. Class 106(i). An accounting machine comprises a rotatable indicator bearing lines of predetermined data and electromagnetic devices controlled by a totalizer or by amount keys to determine differentially the extent of movement of the indicator so as to cause a selected line of data to be displayed. The machine is for printing payroll cheques and the indicator carries a chart having a column of figures representing the gross pay in steps of two dollars ; four columns relating to deductions for the Old Age Benefit, F.O.A.B., the relevant column depending on the precise amount of the gross pay ; two columns of deductions for City Tax, C.I.T.; and ten columns of Income Tax deductions for numbers of dependants from none to nine. In operation, the previous totals of earnings and the deductions for F.O.A.B., C.I.T. and income tax are first entered into corresponding totalizers using appropriate starting keys. The gross pay is then entered into a balance totalizer using a special starting control key and at the same time the number of dependants is entered into the highest order of the totalizer which is split. A subtotal is then taken from this totalizer under the control of an appropriate starting key. When the differential mechanisms have been set in this operation, the indicator is positioned as described below. Next a subtotal is taken from the " Earningsto-date " totalizer, which now contains the present earnings-to-date, by means of the appropriate starting key and a special " Extension " key. During this operation, lamps illuminate the proper columns of the selected line of the indicator as described below to indicate the deductions to be made. If, however, the earnings to date exceed$3,600 no further F.O.A.B. deductions are to be made and a special lamp is illuminated, the normal F:O.A.B. lamp being extinguished. The various deductions are then entered subtractively in the balance totalizer and also into corresponding totalizers) by depression of appropriate starting control keys. Finally a "Net pay total key is operated and during this final operation the lamps are extinguished and the circuits are restored to normal condition. Indicator.-The table is secured round a transparent drum 191, Fig. 3, mounted between rings to which are secured ring gears 195, 196 meshing with pinions on a shaft 227 driven by a motor 230. The ring gear 196 is supported on rollers 211 carried by a frame plate 201. Secured to the other ring gear 195 is a disc 197 of insulating material having a bearing sleeve rotatable on a rod 212 carried by a frame plate 202. To control the positioning of the drum, the disc 197 carries contact segments 450-453, Fig. 8, on its outer surface and on its inner surface a set of contacts 478, Fig. 7, arranged between similar contacts 480. The contacts 478, 480 are engaged by five brushes 497, Fig. 6, mounted on a plate 495 secured to a plate 215 fast on the rod 212 which may be adjusted through a small angle relative to the frame plate 202 to enable the brushes to be accurately positioned. The contact segments 450-453 are engaged by ten brushes 470 spaced equally around a semi-circle and secured in a plate 465 carried by the frame plate 202. The contacts carried by the disc 197 are connected in the circuits to be described by slip rings secured on the disc and engaged by further brushes in the plates 215, 495 and 465. The lamps 400 which illuminate the various columns of the chart are mounted in a support secured between the frame plate 201 and the plate 215. A magnifying device 432 is carried by the indicator casing 435 in line with a horizontal aperture in a cover 430 surrounding the lamps 400. An index 446 is arranged above the magnifier 432. The indicator is mounted on a sub-base and can be adjusted about an axis parallel with that of the drum relative to this sub-base which is mounted on a horizontal plate carried by the accounting machine for sliding adjustment relatively thereto. Selector switches.-The circuits are controlled by selector switches each comprising ten contacts 161, Fig. 2, and an arcuate contact 162 mounted on, and insulated from, a plate 160. The contact elements are engaged by a wiper 163 carried on arm 164 differentially set by a corresponding one of the differential mechanisms of the machine through a known transmission involving internally and externally toothed rings 165, 169 and pinions 167, 170 on square shafts arranged within the toothed rings. One selector is controlled by the$1000 bank differential, two by each of the$100 and$1 banks, three by the $10 bank, and one each by the$0.10 and$0.01 banks. One is controlled by the " dependants " bank and one by the column of total keys. In certain of these selectors, the arcuate contact 162 is split. Line selection.-During the " Gross pay subtotal operation, the total row differential moves to its third position and a circuit is completed through the corresponding selector, Fig. 13D, from a 48v supply over a timing switch D, Fig. 13C, controlled by the mainshaft of the machine and over lead 542 to the middle$10 bank selector. The circuit continues through the appropriate brush 470, Fig. 13B, and either the segment 450 or the segment 451 which are carried by the drum to one or the other of a pair of relays R20, R21. Operation of the relay closes one or other of the circuits of the motor 230 so as to drive the drum in one direction or the other. When the marked brush 470 engages the contact 452 or 453 of the drum, a relay R23 is operated and is locked by a circuit to a holding wire 537. A circuit is thus completed through the right-hand$1 bank selector to the appropriate one of the five brushes 497 and through the adjacent drum contact 478, 480 (arranged alternatively) and contacts controlled by a relay R18, Fig. 13D, to the relay R21 to cause the motor to drive the drum in a clockwise direction. The relay R18 is operated under the control of a$10 bank selector whenever the tens digit is even so that whether one of the contacts 478 or one of the contacts 480 is effective, the relay R21 is operated. This further rotation occurs at a slower speed, a resistance being introduced into the motor circuit by operation of the relay R23. The drum is thus positioned correctly but normally overthrows in which case the adjacent contact on the drum completes a circuit through the relay R20 to reverse the drive. Eventually the drum comes to rest with the marked brush 497 engaging the drum 197 itself between adjacent contacts 478, 480. If the gross pay is$100 or over the lefthand$100 bank selector causes operation of a relay R19, Fig. 13B, which results in operation of the relay R20 instead of R21 and vice versa. Consequently a line on the other half of the drum relating to gross pay figures of$100 or over is selected. In view of the angular extent of the contacts 452, 453, the contacts 478, 480 will become effective in reversed sequence so that the initial slow-speed selection movement will be under control of the relay R20 instead of the relay R21. Operation of the machine is prevented while the drum is being positioned as described below. Column selection.-During the entry of the gross pay, the number of dependants is entered in the highest order differential and the corresponding selector, Fig. 13C, completes a circuit over a switch closed by the " Gross pay" key, the total row selector, Fig. 13D, in its zero position and a timing switch A, and through the appropriate one of ten relays R4-R13, Fig. 13A, which will then be locked in its operated condition by connection to the holding lead 537. During the " Earnings-to-date " subtotal operation a switch 611, Fig. 13D, is closed by the corresponding control key and the total row differential is set to its second position so that its selector completes a circuit over the timing switch A and through a relay R17, Fig. 13B, which is then locked by connection to the holding line 537. The relay R17 closes a circuit to a "Gross pay" lamp 400 and the appropriate one of the tax deduction lamps 403, Fig. 13A, depending upon which of the relays R4-R13 is in operated condition. If the gross pay is less than$60 and there are more than four dependants, no tax is to be deducted. A lamp 433 signals this fact, its circuit being completed when any one of the relays R9-R13 has operated together with a relay R14, Fig. 13B, the circuit of which is closed, during the " Gross pay" subtotal operation, through the left-hand$10 bank selector, and the total row switch in its third position. The space on the indicator allotted for tax deductions for gross pay up to $60 and five to nine dependants is occupied by figures for tax deductions for from none to four dependants when the gross pay is an odd number of dollars. The corresponding lamps are illuminated under the control of the relays R4-R8, the relay R14 and unoperated relays R1 and R3, Fig. 13A, which are operated together in the "Gross pay" subtotal operation only when the gross pay is an even number of dollars, the circuit then being completed through the lefthand$1 bank selector. The appropriate one of the four lamps 401 for the F.O.A.B. deductions is illuminated under control of the relays R1 and R2 in combination. The relay R2 is controlled by the$0.10 and$0.01 bank selectors during the " Gross pay subtotal operation. The appropriate one of the two " C.I.T." deduction lamps 402 is illuminated under the control of the relay R1 alone. If during the " Earnings-to-date " subtotal operation the setting corresponds with an amount equal to or greater than$3,600, after which no further F.O.A.B. deductions are made, a relay R15, Fig. 13B, is operated, its circuit being completed through the total row selector in its second position, the$1,000 bank selector and the right-hand$100 bank s