Patent GB-1001730-A (GB)
Title: Improvements in or relating to mechanism control systems
IPC: G05B19/16
Filed: 1964-02-10
Abstract: 1,001,730. Automatic delivery from endless conveyers. BROOKHIRST IGRANIC Ltd. Feb. 10, 1964 [Feb. 13, 1963], No. 5424/64. Heading B8H. [Also in Division H2] An arrangement for effecting the discharge of articles from an endless conveyer includes a magnetic memory system which comprises means operable for selectively and successively energizing a plurality of input signal circuits in different code combinations, a multiplicity of groups of magnetizable elements 60 mounted on an endless movable carrier, a plurality of magnetizing coils 68, 74 being controllable by the input signal circuits and being fixedly mounted relative to the path of travel of the corresponding magnetizable elements 60 which pass in close proximity to respective magnetizing coils as the carrier moves, the coils magnetizing a coded combination of elements 60 in a different group in accordance with each operation of the energizing means, a cam-wheel 38 synchronized with the movement of the carrier to cause energization of the magnetizing coils as the groups of magnetizable elements 60, pass thereby, a multiplicity of coded groups of magnetic responsive reed switches 70, 76 mounted in spaced apart relation in the direction of movement of the carrier so that the groups of elements 60 successively come into proximity thereto as the carrier moves, each group reed of switches having at least a number of switches equal to the number of elements magnetized for a code combination, and means responsive to the coded groups of reed switches to operate corresponding output control circuits. The magnetic memory system MM is incorporated in the conveyer system of Fig. 1 in which articles conveyed on tiltable carriers, 6b secured to an endless driven member 6a, are transferred on to take-away conveyers 1, 2, 3, 4, 5 according to the coding of the system MM as set up by an operation at station 10 and 12. The endless carrier of the memory system MM which is driven through a reduction gear 6d from the main conveyer motor MCM comprises two parallel endless chains 54 mounted on lower and adjustable upper sprockets, and interconnected by supporting strips 56 of magnetizable material, the ends of which extend into guides 64a, 64b positioned alongside the linear paths of the chains. The magnetizable elements 60 are mounted in blind-ended recesses in non-magnetic case members 58 and are secured therein by riveting the members 58 on to the strips 56. The latter is connected to angle brackets 54a integral with the chains 54. The supporting framework for the carrier means includes pairs of vertical rods 28, 30 which pairs adjustably support therebetween a bank of A.C. " eraser " coils 66, 72, a bank of D.C. " coder " coils 68, 74 and banks of reed switches 70, 76. The supports for the " coder " coils (see Fig. 4) comprise non-magnetizable end blocks 78, 80 adjustably clamped to the vertical rods 28 and 30 and interconnected by a non-magnetizable bracket 82 disposed close in the path of travel of the case members 58 and a magnetizable supporting bar 84. The " coder " coils 68 are screwed and clamped between the bar 84 and the bracket 82 which has holes 82d for the ends of the cores 86 of the coils 68. A U-shaped cross-sectioned terminal strip 88 is screwed on to the supporting bar 84 and has U-shaped terminals 88c riveted to its outer side, which connect the coils 68 with the input circuits. The " eraser " coils are similarly mounted but the bar 84 is non-magnetizable and magnetizable laminations are clamped between the bar 84 and the coils. The support from the reed switches 70, 76 comprises a block 104 of electrically insulating material clamped between the pairs of rods 30 and containing holes 1 to 8 into which the switches are inserted and locate on a shoulder 102b on each switch. The latter is clamped in this position by a member 106 of insulating material faced on the switch side with a resilient strip 106b. The member 106 is mounted on the block 104 brackets 108 and has electrical terminals 110 riveted thereto to connect the switches with the external circuits. The camwheel 38 is attached to the shaft of the lower chain sprockets and the teeth 38a thereof operate limit switches LS1, LS2 mounted on the carrier framework, to cause energization of the " coder " coils. In operation, the main conveyer, take-away conveyers and magnetic memory system are started up and considering the right-hand side of the carrier in Fig. 2 the horizontal rows of magnetizable elements 60 pass down by the bank of eraser coils 72 whereby any previously coded magnetism in the elements is erased. The rows then pass and at this point the limit switch LS 1 is operated allowing energization of combinations previously coded by manually operated switches by the coder coils 74, whereby selected elements in each row are magnetized in coded combination. The rows of elements then pass by a plurality of rows of reed switches 76 successively. The first row of switches is spaced from the " coder " coils in proportion to the spacing  of operations station 10 (Fig. 1) from the takeaway conveyer 1 and the relative speeds of the memory carrier and the main conveyer. The successive rows of reed switches are spaced apart in proportion to the spacing apart of the successive take-away conveyers and in proportion to the relative speeds of the memory carrier and the main conveyer. Successive trays 6b on the main conveyer correspond to successive horizontal rows of elements 60 and to successive cam faces 38a on cam 38. There is a row of reed switches for each take-away conveyer. When a tray 6b carrying a parcel reaches, e.g. takeaway conveyer 1, the corresponding row of switches is passed by a row of coded magnetic elements 60, which if indicative of a conveyer 1 deposit, will cause the tilting of the tray 6b. The code control apparatus on the other side of the memory system is similarly arranged with respect to sorting operator's station 12 for discharge from the trays on the other linear run of the conveyer 6. Lamps LP1, LP2, Fig. 7a (not shown), light up to indicate that the system is ready for coding and that the code has been stored respectively.