Umschluesselungsmatrix

848,217. Copying-telegraph receivers. INTERNATIONAL BUSINESS MACHINES CORPORATION. April 3, 1957 (April 3. 1956: April 9. 19561. No. 10918/57. Class 40(3) [Also in Groups XVI and XXXVIII] A mechanism for forming character pattern on a movable magnetic surface 24 comprises a magnetic head assembly, Fig. 1, having a column of individual elements which are selectively energized as the magnetic surface moves past the head, so that the character is formed by a successive series of vertical columns, the energization of the heads being determined by a character generator 1211, Fig. 8, selectively conditioned by a decode matrix which is responsive to incoming signals e.g. a 6 bit code store 42. As shown the magnetic surface 24 is on a drum 41 upon which characters are formed by a column of nine elements 61. The elements each comprise a magnetic core 3 inserted in a conductive sleeve 6 which is fitted in a base 8. The sleeve 6 forms part of a secondary circuit of a transformer 20 so that when an appropriate amplifier 30 is pulsed energizing a winding 22 of the transformer 20, a magnetic flux F, Fig. 2, is set up to form a magnet mark on the surface comprising a spot of one polarity surrounded by a ring of opposite polarity. Magnetic ink is then applied to the magnetic surface which then transfers the image to an absorbent paper. The character generator comprises a number of magnetic cores 22a, Fig .7, each provided with a read-in, a read-out and a sense winding. The read-in windings are operated from the decode matrix to determining which character image is to be formed and the read-out windings are pulsed by an element ring 26 which pulses each all character increment positions column-bycolumn through lines I1 to 17 and lines 24-1 to 24-7. The element ring 26 is under control of a "Sync" pulse or line 38 from a head 36 sensing a track 34. When both a read-in and a read-out winding is energized in one core, the sense winding will be energized to operate the associated amplifier 30, while the core will be reset. The decode matrix (Fig. 9 not shown) comprises six rows of cores each including a code core. The cores are arranged in Christmas tree fashion, 2, 4-64, in binary lines 1, 2-x respectively and which are energized selectively in conjunction with a core stepping register which sends a pulse to each of the six rows seriation, the appropriate read-in lines for the various characters are energized.