Patent GB-724993-A (GB)
Title: Statistical data recording apparatus
IPC: G06K19/00
Filed: 1953-01-26
Abstract: 724,993. Statistical apparatus. COMPAGNIE DES MACHINES BULL. Jan. 26, 1953 [Feb. 7, 1952], No. 2257/53. Class 106 (1). A statistical data recording apparatus records visible printed characters in magnetic ink on cards or tape which are then magnetized in predetermined zones within the area of the printed character, the predetermined zones being selectively magnetized according to a code representing the coded value of the character. Digits or letters are recorded on paper. tape 11, Fig. 2a (or separate cards on a belt carrier) bearing perforations, for exact location of the tape or belt, by striking keys in the manner of a known typewriter, subsequently at the end of each line of typed characters the paper tape: 11 is raised up to align with magnetic recording heads 52 which are supplied selectively with alternating current of frequency 500-3000 cycles per second to magnetize the predetermined coded areas of each character.. Fig. 1 shows the paper tape 11 with perforations 12 and numerals printed in magnetic, coloured ink, the shaded horizontal areas representing, in the case of each character, the location of the coded areas of magnetization applied subsequently by the magnetic recording heads. The coded value of each magnetized area is indicated at 13, which is a positioning mark printed with the same material as the characters at the end of each recorded line. The carriage 14, Fig. 2a, is provided with feed and take-up rollers 16, 15 for the paper tape 11 which frames from feed roller 16 under tension roller 34 between upper roller 33 and roller 26, between lower roller 33 and roller 27 over brace rod 38 and is re-rolled on take-up drum 15. The part of the machine designated 21 is movable in a vertical direction under the influence of the cam 42 on the upright pillars 24, the profile of the cam 42 is designed so that the upward stroke of the mobile element 21 will be linearly proportional to the rotation angle of shaft 43, i.e. proportional to the elapsed time. This stroke is represented by the height " D " in Fig. 5. There are a series of twentymagnetic heads 52, Fig. 2a, for the magnetic impression of the characters and also the positioning mark. The magnetic heads are fixed in recessed blocks of non-magnetic metal arranged so that they are in line with the printed characters. The construction of each head being similar to the known construction employed in sound-recording technique. When each character is printed corresponding storage circuits are energized by means of electric contacts provided under each key and closed by means of an insulated extension 59 fitted under each key lever. Key 65, Fig. 4a, when struck, closes contacts 66 causing energization of winding 67 of a " one-turn " electromagnetic clutch and hence one turn of the shaft carrying cam 42, and this constitutes the time of recording represented by " T " in Fig. 5. During this time, cam contacts CC1, CC2, CC3, CC4, CC8, Fig. 4b, close as indicated in Fig. 5 in synchronism with the rising of the paper tape, carried by mobile element 21, Fig. 2a, and CC3, Fig. 4a, opens in order to de-energize the storage relays. Keys 68 and 69, Fig. 4a, control the visible impression of the positioning mark and zero respectively, and do not therefore close any contact, when struck. Each recording head, T1 to T20 and Tm, is fed from a transformer 85 coupled to the cathode load 93 of a triode valve amplifying stage 86. Lines 101, 102, 104, 108 are fed with H.T. voltage, in the order mentioned, by the closing of contacts CC1 to CC8 in order as shown in Fig. 5.. Rectifiers 87 are included in each lead as unidirectional devices to prevent parallel circuits. Each triode 86 is supplied with alternating frequency from the frequency generator G via. grid resistors 89, and when a triode has H.T. applied to its anode under control of the cam contacts CC1 to CC8 an alternating frequency output is passed to the respective recording head via the cathode coupling resistor and associated transformer. After recording one line the operator may advance, the paper tape by line spacing means co-operating with the roller 15, Fig. 2a.