Patent GB-643189-A (GB)
Abstract: 643,189. Accounting-machines. NATIONAL CASH REGISTER CO. Feb. 9, 1948, No. 3739. Convention date, May 29, 1947. [Class 106 (i)] In an accounting machine including two banks of manipulative devices, a differential mechanism for the first bank and an auxiliary setting device controllable by the manipulative devices of the. second bank to control the setting of the said differential mechanism, the two banks of manipulative devices are adjacent and a group of members, one of which is associated with, and operated by, each manipulative device in the second bank, is located between the two banks and co-operates with the auxiliary setting device to cause the said differential mechanism to be set under control of any one of the manipulative devices of the second bank to the same extent as that to which it would be set under control of the corresponding manipulative device in the first bank. A column of debit transaction keys 20, Fig. 2, is associated with a differential mechanism of the Shipley type which controls a mechanism (not described) for selecting the line of a statement sheet on which printing is to take place. A parallel column of corresponding credit transaction keys controls a similar differential mechanism which sets type-carriers to indicate that the amount printed is a credit entry. Zero stops 65, Fig. 6, and 55, Fig. 2, for the credit and debit differential mechanisms respectively, are normally held in inoperative positions by a depending portion 90 of a lever 86, which portion is engaged by a stud 91 in a sprung arm 73 fast on the shaft 66 of the zero stop 65 which carries a stud 64 to block clockwise rocking of a sprung arm 70 fast on the shaft 56 of the zero stop 55. The lever 86 is held by a spring 88 against a stud 82 in a yoke 80 and is so shaped at the point of contact that, when the machine release shaft 75 rocks the yoke 80 through a link 77 at the beginning of an operation, the lever 86 rocks clockwise to release the zero stops. If, however, a debit key 20 has been depressed, a link 50 will have been cammed downwardly and will have rocked an arm 52 into the path of a stud (not shown) in the zero stop 55 so as to hold it in its inoperative position. If, on the other hand, a credit key has been depressed, the zero stop 65 will be held inoperative by similar means and by virtue of the stud 64 and arm 70, the zero stop 55 will also be held inoperative. Each credit key 30, Fig. 1, has a stem by which it can position the corresponding differential mechanism, but also carries a stud 36 which, when the key is depressed, engages a stud 46 in a sprung bar 40 to depress this bar also. The bar enters the path of an arm 141 connected by a stud 145 and hub 142 with an arm 143 having a slot engaged by a stud 144 in the bellcrank 109 pivoted on the differential arm 100 of the debit differential mechanism. Thus, when the arm 141 strikes the depressed bar 40, the bell-crank 109 is rocked to break the latch between the arm 100 and the driving member. The debit and credit differential mechanisms are thus both set to similar differential positions. At the end of the cycle, the machine release shaft 75, and thus the lever 86, are restored and a cam-surface 98 on the portion 90 engages the stud 91 to withdraw, or hold withdrawn, the zero stops from their blocking positions. Specification 547,954 is referred to.