Patent GB-710493-A (GB)
Abstract: 710,493. Transfer mechanism; zeroizing- mechanism. BROIDO, D. Dec. 13, 1951 [Jan. 2, 1951], No. 176/51. Class 106 (1) Transfer mechanism in an accounting machine having totalizer elements movable in opposite directions in addition and subtraction comprises, for each order, storage means operable when the associated element moves from 9 to 0 in addition or from 0 to 9 in subtraction and check means operable after a value-entering operation to determine whether the element stands at 9 or 0 depending on the sense of the entry, and means controlled by the check means for interlocking the storage means of adjacent orders and means controlled by the storage means for driving the elements simultaneously one step in a direction depending on the sense of entry. In one arrangement, Fig. 1, the differential mechanism 20, 27, 17 enters an extra unit into each order and rotates the totalizer wheels 10 in reverse directions for addition and subtraction. The transfer mechanism then enters one unit in a reverse sense into those orders which do not require a carry. When 'a totalizer wheel passes from 9 to 0 in addition or from 0 to 9 in subtraction, a transfer cam 16 rocks a latch 30 away from a transfer plate 33. After the actuation of the totalizer wheels a shaft 42 set axially according to whether addition or subtraction is being performed, is rocked by cain means so that feelers 41 are urged by torsion springs towards the wheels, each of which has a pair of notches one on each side of its periphery and angularly spaced by one step. The feelers 41 enter notches if the corresponding wheels are at 0 in addition or at 9 in subtraction, this indicating, in view of the entry of an extra unit, that a transfer is only necessary from an order if a transfer is received from the lower order. When a feeler 41 enters a notch, a, corresponding latch 48 is rocked to release a coupling member 51, a nose 54 of which drops between lugs 55, 56 on the transfer plates 33 of the corresponding and next lower orders. Thus in such orders, when a camcontrolled bail 40 is rocked clockwise, the plate 33 can rock clockwise to follow the bail only if the next lower plate 33 a!so rocks clockwise. In these circumstances, the member 51 slides to the right on a pin 52. If a totalizer wheel has passed 0 in addition or 9 in subtraction, the corresponding member 51 is held ineffective and the plate 33 is able to rock clockwise in any case. The plates 33 are urged clockwise by transfer actuators 36 loaded by springs 39. A grooved pawl 63 carried by each actuator 36 normally engages a pin 62 in a gear segment 57 but this connection is broken if the transfer plate has been rocked clockwise by the actuator 36. Thus when a support 59 for the segments 57 is moved by cam means to mesh the segments with the wheels 17 and the actuators are moved vertically as described below, only those segments in orders which should not receive a transfer are rocked, this movement cancelling the extra unit already added into the totalizer wheel. The direction of movement of the actuators 36 is determined as follows. The frame 38 carrying the actuators 36 is carried by arms 132, Fig. 6, rockable with a plate 130 carrying studs 129 co-operating with notches in a link 125. Early in an operation, this link is depressed by a cam-lever 122 so that the frame 38 is moved to a central position. A lever 134, having arms 136, 138 which co-operate with pins 144, 145 in add and subtract cams 116, 117 respectively, one or the other of which is driven according to the sense of rotation of the main shaft, is set in either of two positions, and held by a detent 140, according to whether the machine is adding or subtracting. The lever 134 is pin-and-slot connected to the link 125 and consequently the latter is set in the position shown or in a slightly counter-clockwise position. Thus when the link 125 is restored upwardly the frame 38 is moved upwardly or downwardly depending on the nature of the machine operation so as to add or subtract a unit in each order where a carry is not required. The lever 134 also sets a shaft 141 angularly according to whether the machine is adding or subtracting and the shaft 141 sets a cam, the follower of which determines the axial position of the feeler shaft 42, Fig. 1. A stud 66 in a spring-loaded lever 67 prevents counterclockwise rocking of the actuators 36 once they have been moved vertically to rock the segments 57. The plates 33 and coupling members 51 are restored by the bar 40 and a cam-controlled bar 71. In a modification for use in machines in which an extra unit is not added in each order, the feelers 41 unlatch the latches 48 and 30 if the totalizer wheels register 9 in addition or 0 in subtraction to prepare for consequential transfers, and the arrangement is such that if a transfer plate 33 is freed, the actuator 36 remains in engagement with the segment 57 to effect the transfer. If a plate 33 remains latched, the segment 57 is moved out of engagement with the actuator 36 as it is meshed with the wheel 17 so that no transfer takes place. The actuators 36 in this case, are moved vertically so as to enter the transfer units in the same sense as the main entry. Zeroizing.-When the totalizer is zeroized by fingers 74 on a bar 73 engaging 'stops 72 on the gears 17, overthrow is prevented by the transfer latches 30 which are locked for this purpose by the lowering of a bar 75. The bail 40 restores the transfer plates 33 and the segments 57 are withdrawn from the gears 17 during the zeroizing operation. Specifications 687,582 and 710,492 are referred to.