Patent GB-650792-A (GB)
Title: Electrical calculating apparatus
IPC: G06F7/46
Filed: 1947-08-12
Abstract: 650,792. Electric selective signalling. LARSEN, F. O. V. Aug. 12, 1947, Nos. 22348/47, 22349/47, 22350/47 and 22351/47. Convention dates, April 29, 1946, June 14, 1946, Aug. 13, 1946, and Aug. 29, 1946. [Class 40 (i)] [Also in Group XIX] Coaxially mounted register discs in an electric digital calculator (see Group XIX) are driven independently under the control of electrical marking switches. As shown, Fig. 1, a marking switch 19 set manually or by remote control grounds one of a number of terminals in the bark of a switch 16 the wiper of which normally makes contact with all the terminals but the first. A self-interrupting circuit is thus made for magnet 13 which drives the corresponding register disc and the switch 16 until the latter breaks the marking circuit. In a modification, Fig. 2, in which the register discs are selectively clutched to a common drive under the control of a remotely control switch 35, the switch 16 is replaced by drum 31 carrying pins for opening the marking circuits one at a time and driven by an electric motor arranged when once started to drive the drum through a complete revolution. Alternatively the drum may be selectively clutched to a constantly running shaft and separate motors may be provided for each register disc. The settings of the registering members 1 may be transferred to a further set of numeral wheels 100, Fig. 5, e.g. for printing a record. The registering members 1 having been set up as described, a motor 96 is started which rotates a shaft 2 (possibly through a magnetcontrolled reversing gear 28) together with' discs 73 which are notched to co-operate with a contact feeler 75 and have projections 72 arranged to engage projections 71 on associated registering members. As a feeler 75 rides out of its notch 74 a circuit is completed through contacts 77, 78, selector switch 79, 80, to a solenoid 90 to complete the drive from a shaft 92 rotated by a motor 95 to the selected numeral wheel 100 (in this case a type-wheel). The drive continues until the'projection 72 engages the projection 71. This causes axial displacement of the disc 73 and the feeler 75 leaves its periphery and slides down the face of the disc thus opening the circuit of the coupling magnet 90 and stopping the numeral drum 100. When the disc 73 completes its revolution the feeler 75 enters the notch 74 laterally, allowing the disc 73 to resume its normal position. Also, a relay 110 is energized completing the circuit of a coupling magnet 112 and causing a gear 97 and cam disc 101 to be driven whereby, when a follower 102 falls into a notch 108 in the cam, hammers 106 on a common shaft are spring- urged to strike a paper strip 107 and so print from the top wheels 100. The type-wheels 100 can be set simultaneously with the setting of the registering members 1 by energizing a relay 116 which transfers contacts 78 and brings the coupling magnets 90 under the control of coupling magnets 13 via contacts 117. Alternatively, the registering members may comprise cam-operated switches which transfer the setting to the registering members 100 (Fig. 6, not shown).