Patent GB-1045775-A (GB)
Title: Apparatus and method for threading filaments through a plurality of apertured elements
IPC: G11C5/12
Filed: 1964-01-27
Abstract: 1,045,775. Magnetic storage matrices. SPERRY RAND CORPORATION. Jan. 27, 1964 [Feb. 8, 1963], No. 3413/64. Heading H3B. In a magnetic core threading apparatus the wires have a rotational motion imparted to them as they thread the cores by axially reciprocating the drive roller shafts, engaging the wires, in opposite directions. A core nest 126 provided with a plurality of notches for holding the toroidal magnetic cores on edge is positioned on top of a vacuum box of manifold 128 secured to the circular plate of turntable 112. In order to string the Y-drive lines the nest table 112 is positioned with the Far Y and Near Y pull-down needles 144 projecting upwards through slots 138, 134 each carrying a supporting member 146, of the rectangular manifold 128. The vacuum is then turned on in the core nest to clamp the assembly in position with the cores arranged in rows and columns and shaker table 20 carrying spools 26 energized. At the same time air is supplied through the spool axles to cause the spools to float and a reel-off motor started to drive a set of drive rollers 28, 30 which also confine the wires from all the spools in a single horizontal plane. After a desired amount of wire has been unreeled from the spools the motor is stopped and a drive roller motor 68 connected to drive roller 40 of a pair 40, 42 through which the wires pass, Fig. 3. Energization of the motor 68 causes the wires passing between the rollers 40, 42 to be advanced through the eyes of the Far Y needles and the array of aligned cores. At the same time motor 94 is energized to drive cams 84, 86 which together with cam followers 80, 82 on shafts 44, 46 cause the rollers 40, 42 to oscillate longitudinally 180 degrees out of phase with each other, springs 98, 100 serving to bias the respective cam followers against their associated cams. The wires are thus caused to rotate about their own longitudinal axis as they are advanced to permit a relatively straight line searching control to be achieved. The wires are severed after passing through the core array and the eyes of the rear bank of Y needles 144 and the needles are then moved downwards through the apertures in printed circuit board 140 and the wires soldered to the lands 143. To thread the X-drive and inhibit wires table 112 is rotated through 90 degrees so that the double rows of needles are positioned as shown in Fig. 6. The inhibit needles 246, 248 have a larger diameter than the X-pull down needles and are also provided with notched-out areas 252 instead of apertures. As in the threading of the Y-drive wires the wires are advanced to thread the needles and cores, the inhibit and X-drive needles being staggered so that only one wire of an adjacent pair passes through the eye of an X-pull-down needle whereas both wires pass through the notched eyes of Inhibit pull-down needles. The wires are then severed and the Inhibit needles withdrawn so as to pull the extremities of the wires out of the eyes of the X-pull-down needles and under the printed circuit frame. The X-drive wires are then threaded in a similar manner, the wires being passed through the X-pull-down needles 246, 248 which are then moved downwards after severance of the wires through the printed circuit board. Only half of the Y-drive and X-drive lines are pulled through apertures to the underside of the frame, the other half remaining on the upper surface of the frame, being threaded by turning the frame upside down.