Patent GB-743554-A (GB)
Abstract: 743,554. Calculating-apparatus; transfer mechanism. NATIONAL CASH REGISTER CO. April 30, 1954 [July 2, 1953], No. 18326/53. Class 106 (1). In a calculating machine adapted for the avoirdupois system the units of pounds actuator co-operates with two stop members controlled respectively by the units of pounds and tens of pounds totalizer wheels so that when the number of pounds registered exceeds twentyseven the units of pounds actuator is able to move through two additional steps. The invention is applied to the machine described in Specification 693,659 in which the totalizer is shifted axially for subtraction to align pinions 48, Fig. 9, with the actuators 36 instead of the totalizer pinions 44. The pinions 48 are fast with pinions 49 meshing with the pinions 44. At transfer, in the decimal orders, a tooth 47, Fig. 4, fast with the number wheel 45 rocks a lever 72 which is latched in its operated position. A stop thereon is thus moved from the path of the actuator rack of next higher order which moves an additional step relative to the differentially moved lever which supports it under the action of a spring. In subtraction, the transfer lever 72 is rocked by a tooth 46 laterally offset relative to the tooth 47. The present machine has a column of nine keys associated with a normal decimal totalizer wheel in the units of pounds order, and, for entering tens of pounds, two keys controlling a totalizer wheel marked 0-2 four times in succession. This wheel has four pairs of transfer teeth. Quarters are entered by a bank of three keys associated with a totalizer wheel marked 0-3 twice and having two pairs of transfer teeth. Ten hundredweights may be entered by depressing any one of a bank of nine keys, the corresponding totalizer wheel being marked 0 and 1 five times and having five pairs of transfer teeth. The units of hundredweights and the several tons orders are normal decimal orders. The units of pounds actuator 36, Fig. 3, is' able to move two steps relative to its supporting lever 25 which for this purpose is returned through an extra step relative to the other levers. This extra step is permitted by a spring coupling between the lever and its type-bar. The actuator is normally held in its zero position by the abutment of a lug 53 thereon against a pair of stop surfaces 54, 55 of brackets 56, 57 independently rockable about a shaft 58. A cam 63 fast with the unit-pounds wheel 44 rocks the bracket 57 when that wheel passes from " 7 " to " 8 " and holds it depressed in the " 9 position. The left arm 69 of the bracket 56 has a cam surface 70 engaged by an add transfer tooth 47 of the tens of pounds totalizer wheel when that wheel passes from " 1 " to " 2 ". Thus, if the tens wheel registers 2, the stop 54 is ineffective and as the units wheel passes from " 7 " to " 8," the stop 55 is also displaced so that the units actuator is permitted to enter two extra units. As the units wheel passes from " 9 " to " 0," its transfer lever 72 is depressed. A pawl 79 carried by the lever 72 engages a notch 83, Fig. 10, in a member 80 and rocks it downwardly one step about the shaft 58, in which position it is held by the engagement of a lug 75 of a latch 74 on a second step 82 of the member 80.. In this position a stop surface 84 is placed in the path of a lug 87 on the tens actuator in place of a surface 86. The tens actuator is thus permitted an extra step to advance the tens wheel by the transfer unit. The tens wheel in turn actuates the transfer lever 89 which is held by the latch 94 so that a transfer unit is entered in the normal way in the quarters order. The transfer latches are rocked early in each cycle to release any operated transfer levers. The lug 75 of the latch 74 rocks the pawl 79 to allow restoration of the member 80. If, independently of the units wheel, the tens wheel passes from " 2 " to " 0," the lever 89 is depressed and its stop lug 92 holds the arm 69 in its lower position. The stop 54 is consequently held ineffective. Moreover, a stud 100 in an arm pivoted to the latch 94 engages the end of a slot in the left end 67 of the bracket 57 and rocks the latter to move the stop 55 to permit the two extra units to be added. In subtraction, as the totalizer is shifted axially, the cam 63 of the units wheel and the add transfer tooth of the tens wheel are unable to rock the brackets 57, 56. However, in this case, when e.g. the tens wheel passes from " 0 " to " 9 " the lever 89 is depressed, its lug 92 rocks the arm 69 and bracket 56 and the latch 94, in moving to operative position, rocks the bracket 57 through the stud 100. In certain circumstances, e.g. when 19 pounds is subtracted from 1 quarter 10 pounds, the tens wheel must receive two transfer units. For this purpose, the tens actuator can move two steps relative to its lever which is returned through an extra step and spring-coupled to its type-bar. On the second depression of the transfer lever 72, the pawl 79 engaging the lowest step 82, depresses the member 80 by a further step beyond the position to which it has already been moved and the lug 75 engages the top step 82. The lug 87 of the tens actuator is then able to move two extra steps into contact with a surface 85.