Patent GB-849752-A (GB)
Title: Improvements in or relating to 10-key calculating machines
IPC: G06C7/08
Filed: 1958-03-14
Abstract: 849,752. Calculating-machines; transfer mechanisms; zeroizing mechanisms. CARLSEN, H. G., and CARLSEN, E. A. March 14, 1958 [March 21, 1957], No. 8320/58. Class 106 (1). A ten-key calculating-machine has a pincarriage of curved form with which co-operate rotatably mounted differential actuators for the totalizer. Setting mechanism.-The " 0 " to " 8 " keys each have a portion connected to a corresponding one of a set of tightly wound coils 52, Fig. 2, guided in curved channels in a block 47. The ends of the coils 52 are arranged to actuate the pins 26 of the curved pin-carriage 24, 25 (see also Fig. 3), which is mounted for movement across the machine. The pins are frictionally held in normal or set position by artificial resin or other filling material in the carriage, which material may also have a lubricating effect. A fixed plate 27 serves as a " 9 " stop, and a plate 28 acts as a zero stop for those higher orders in which no entry has been made. On depression and release of any number key, an escapement mechanism, Fig. 4 (not shown), is operated to allow the carriage to advance by one step under the action of a spring 39, Fig. 7, on an arm 38 coupled to the carriage. Differential mechanism.-On depression of an actuating lever 146, Fig. 9, a secondary lever 149 on a shaft 150 is rocked and, by a roller 157, rocks a cam 73 clockwise. Between the cam and a corresponding plate are carried a cross-bar 72 and a rod 74. Springs 75 urge actuating segments 68 to follow the rod 72 until their tails engage the set pins. The tails are bent inwardly towards the centre of the machine to allow the columns of pins to be more closely spaced than the totalizer pinions. Addition and subtraction.-The shaft 150 of the secondary lever carries a member 162, Fig. 10, having teeth meshing with a pinion 169 fast with a notched disc 171. On depression of the actuating lever, the disc 171 is rotated counter-clockwise and acts on a finger 174 to rock a shaft 89 counter-clockwise as seen in Fig. 2. Toothed members 88 on this shaft withdraw pinions 84, formed with teeth 91 and with end teeth adapted to engage the actuators 68, from the latter and lock them against rotation. The pinions 84 are carried by shafts 83, also carrying number wheels 92, mounted in a frame 80 movable laterally between addition and subtraction positions. On the return of the actuating lever, the disc 171 rocks the shaft 89 in the reverse direction and the members 88 engage the pinions 84 with the actuators prior to the return of the bar 74 under the control of the cam 73, which movement restores the actuators. Subtraction is performed by shifting the totalizer frame 80 laterally to align the opposite edges of the pinions 84 with the actuators so that the pinions are rotated in the opposite direction. For this purpose, depression of a subtraction key tilts a member 185, Figs. 7 and 10, mounted on a lever 181 engaging the totalizer frame at 180. The end 186 of the member 185 is thus moved up against a shoulder 187 of a link 189 actuated, on depression of the actuating lever, by the member 162, so as to shift the frame. The latter is restored to the addition position by a link 190 in the next operation during which the subtraction key is not depressed. During the depression of the actuating lever, a link 62 rocks a lever 59, Fig. 7, so as to load a spring 60 and engage a pawl 63 behind a lug 198 of the arm 38 coupled to the pin carriage but the latter is held against return movement by a pawl 36, Fig. 3, which is freed by the end 144. Fig. 9, of the actuating lever to engage a carriage rack 35. When the actuating lever returns, the pawl 36 is disengaged and the pin-carriage is restored by the lever 59 and the arm 38. During this movement, set pins are restored by a fixed cam plate. Transfer mechanism.-At transfer, in either addition or subtraction, a cam 105 on the totalizer pinion shaft 83 rocks levers 106, 110 to release a stop lever 135 associated with the next higher order actuator 68. The latter is thus able to move an additional step, when restored, beyond the zero position, under the action of a spring 78 engaging the actuator and normally tensioned by the bar 74 when in its rest position. The parts are restored early in the next cycle by a bar 139 on a shaft 140 rocked by the member 162, Fig. 10, through a link 175. Zeroizing.-On depression of a cancellation key, a comb 96, Fig. 2, is rocked to engage teeth 95 with cams 93 on the totalizer pinion shafts 83. The latter are thus shifted to disengage the pinions 84 from the actuators and then the teeth act on the cams 93 so as to zeroize the number wheels 92. Multiplication. Operation counter.-Depression of a multiplication key lowers an arm 195, Fig. 10, so that the link 62 which rests thereon will not actuate the pin-carriage restoring lever 59. A set amount thus remains set and may be repeatedly entered. A number wheel, shaft and pinion similar to one order of the totalizer, are advanced by one step during each operation, by an actuator 68 controlled by a fixed abutment, so as to act as an operation counter. Division may be performed by repeated subtraction and for this purpose, the item counter wheel may be numbered in the reverse direction as well as in the normal direction.