Patent GB-675208-A (GB)
Title: Improvements in card-controlled accounting machines
IPC: C07C51/00
Filed: 1949-06-23
Abstract: 675,208. Typewriters &c. BRITISH TABULATING MACHINE CO., Ltd. June 23, 1949 [June 23, 1948], No. 16697/49. Class 100 (iv). [Also in Group XIX] In a cyclically operating accounting machine controlled by record cards in which numerical data are represented by holes according to a combinational code (see Group XIX), successive electrical impulses, one for each hole sensed, are sent to a magnet which controls means for translating the combinational impulses representing a digit into a single timed mechanical impulse, this impulse controls the time of engagement of a printing wheel clutch to select the appropriate digit-printing element and, when the clutch is engaged, an electrical impulse is transmitted to the magnet of an accumulator wheel clutch timed so as to enter in the accumulator the same digit as is printed. The machine described includes the apparatus described in Specification 675,183, [Group XIX], two successive card sensing stations plus the impulsetranslating and printing mechanism of Figs. 22a and b. The record card, Fig. 16, is as described in Specification 21219/48 (as open to inspection under Sect. 91) digits being represented according to a 4-hole code. Translating and printing mechanism. The successive impulses representing a digit are sent to a magnet 861, Figs. 20a and 22b, which, when energised, attracts its armature 815 to pull an associated link 816 to the left, Figs. 22a and b, thus rocking pawls 806. Each pawl is connected by a compression spring to a member 810 engaging a cam 800. These cams 800 a to d correspond to the card hole positions 5, 3, 1, 0 respectively, Fig. 16, and rotate once for each machine cycle, so that when e.g. pawls 806 are rocked due to the receipt of a "5" impulse, a high portion on cam 800 a will move the associated member 810 upwards to be latched behind its pawl. Those members 810 which are unlatched when all the successive impulses have been received prevent leftward movement of a link 863 until they are all engaged by " medium " portions on the cams 800. A spring-urged member 813 then drops into a notch in the constantly rotating cam 825 thus sending a timed mechanical impulse through the link 863 to a releasing arm 867 for the printing wheel clutch. A spring- urged pawl 876 carried.by a gear wheel 870 then engages a notch in a constantly driven member 868, so that the gear wheel and the type wheel 860 meshing therewith start a complete revolution. A cam portion on a member 898 carried by the wheel 870 then rocks a lever 896 to close contacts 672, Figs. 22a and 20c, in the circuit of the accumulator clutch magnets. The wheel 860 is carried by an arm 881, pivoted at 882, and rocked by a projection 883 on a cam disc 885 at a fixed time in the machine cycle to rock the selected type against a paper-carrying platen 890. The disc 885 is driven by a clutch similar to the type wheel clutch and engaged when a pawl 887 is freed from a member 888. This is effected by a further (RN) impulse sent to magnets 861, when each link 816 engages a spring- pressed lever 824 whose movement is controlled by a cam 820 to bring a notch 826 below the member 888 which is controlled by a constantly rotating cam 837. The links 816 are returned by the cam 820 to ensure that the armatures 815 do not stick to the magnets: The clutch and other cam shafts are connected through toothed gearing (not shown) to the main drive cam shaft 822. Specifications 375,889, 483,021, 583,933 and 638,890 also are referred to.