Patent GB-770319-A (GB)
Abstract: 770,319. Statistical apparatus. POWERS SAMAS ACCOUNTING MACHINES, Ltd. June 24, 1955 [July 20, 1954], No. 21186/54. Class 106 (1). In a calculating machine having a set of toothed elements for co-operation with an accumulator comprising intermeshing sets of add and subtract wheels, storage wheels are engageable with actuators coupled to the toothed elements and a sub-total operation, in which a previous total stored in the storage wheels is added to the total registered by the accumulator and the new total is entered into those wheels, takes place in three revolutions of the main shaft as described below, a selector device determining whether the add or subtract wheels of the accumulator are engaged with the toothed elements during the entry in accordance with the sign of the stored amount. The operation is modified, also as described below, in grandtotal-taking, in which the new total is printed but not entered into the storage wheels. Throughout the first of the three cycles, the accumulator is engaged with the toothed elements and the amount registered thereby is printed. In the second cycle the total stored in the storage device is entered into the accumulator, by engaging the storage wheels during the forward stroke of the actuators and the accumulators during the return stroke, and no printing takes place. In the final cycle, the actuators are set according to the new total by engaging the accumulator during the forward stroke and the zeroized accumulator is disengaged. Moreover, in the case of a subtotal, the storage wheels are then engaged to receive the new total which is not printed, whereas, in the case of a grand total, the new total is printed but the storage wheels remain zeroized. The invention is applied to a record-card controlled machine similar to those described in Specifications 526,762 and 405,666, having actuators 2, Fig. 1, differentially set under the control of stops 1 projected by sensing pins. The actuators cooperate with the storage wheels 49 and are connected to type bars 3 and toothed elements 8 which co-operate with accumulator add and subtract wheels 10, 11. The latter are mounted in a cradle 9 which is moved to engage the accumulator by a link 13, Fig. 2, connected by means including links 33, 36, Fig. 3, to a changeover dog 37 normally engaging a pin 40 in an arm 42 which is cam-operated to cause the accumulator to be engaged so as to receive entered amounts. When the cradle 9 is operated, it is rocked to engage either the add wheels 10 or the subtract wheels 11 by the abutment of one or the other of a pair of pins 23, 24 against the corresponding end 30 or 31 of a member 26 positioned in known manner according to the sign of the amount to be entered or, in total taking, of the-total registered by the accumulator. The storage wheels 49 are engaged by cam arms 51 connected to a link 54 having a slot normally engaging a stud 56 in a disc 57 fast on a shaft 58 which is connected by means including a link 66 to a follower 67, Fig. 3, actuated by a cam 69. Control unit. The cam 69 and other cams effective in total taking are mounted on a shaft 70 which, on operation of a link 82 by means described in Specification 371,849, is rotated by means of a clutch 75, 76 through one revolution, during which the main-shaft 32 drives the machine through three cycles. The cam 69 engages the storage wheels during a three-cycle sub-total operation at the times specified above. In grand total operations, a control signal obtained in known manner engages a further clutch, Fig. 13 (not shown), so that a shaft 72, Fig. 1, is rocked and a plate 71 thereon disconnects the link 54 from the stud 56 to prevent engagement of the storage wheels during the third cycle. A second cam-shaft 85 is geared to rotate with the cam-shaft 70 and carries a cam 86 which through a follower 87 and link 89 shifts the dog 37 of the accumulator engagement mechanism. The dog disengages the pin 40 and engages a pin 41 in a follower 91 controlled by a cam 93 on the shaft 70 so as to engage and disengage the accumulator during the three cycles as described above. During total operations, a cam 97 actuates a bail 95, Fig. 1, to withdraw zero stops 4 for the actuators. Add-subtract selector device. During the second cycle when the previous total is transferred from the storage wheels to the accumulator, the add or subtract wheels of the latter are engaged according to the sign of the previous total which has determined the setting of the selector device in the third cycle of the preceding total operation. In such cycles, in which the total is taken from the accumulator, the cradle 9, Fig. 8, is positioned in known manner according to the sign of the total and correspondingly moves a selector lever 114. At this time, a slide 112 carrying a stop lever 111 is moved to the right into the position shown, through means including a link 128, by a cam 121, Fig. 3, on the shaft 85. Thus the selector lever 114 moves the stop lever 111 to or maintains it in, a position corresponding to the sign of the total. In the second cycle of the following total operation, the cam 121 causes the spring 132 to be tensioned to urge the slide 112 to the left. If the stop lever 111 has previously been set in the position shown (positive total), it engages a stud 134 to block movement of the slide, but if it has been rocked counterclockwise (negative total), the stud 134 enters a notch in the stop lever and the slide 112 moves and acts on a linkage 138-140 so that a projection 141 of the link 140 is engaged by a stud 142 in a cam-operated arm 143. The link 140 is then moved longitudinally to rock the abutment member 26 to cause the negative wheels of the accumulator to be engaged. Non-print control. Printing is prevented during the second cycle of all total operations and during the third cycle of sub-total operations as follows. When the shaft 58, Fig. 11, is rocked in this cycle to engage the storage wheels, a pin 189 in an arm thereon allows downward movement of a latch 181 under the action of spring. The latch is carried by an arm 183 on a shaft 184 coupled through a lever 187 to a shaft 191 carrying a shutter, Fig. 12 (not shown), which is thus moved to prevent operation of the printing hammers. A shaft 156 is then rocked under control of the mainshaft and an arm 174 thereon rocks an arm 176 so that a pin 179 disengages the latch 181 from the pin 189. In sub-total operations, the non-print shutter therefore remains effective. The parts are restored after the shutter has been effective to prevent printing in the third cycle. The shaft 191 is, however, held in the ineffective position by an over-riding control actuated by the link 73 in the third cycle of a grand total operation to enable printing to take place.