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    • 5. 发明公开
    • Sorting apparatus
    • 分拣装置
    • EP0210074A3
    • 1988-03-09
    • EP86305648
    • 1986-07-23
    • DE LA RUE SYSTEMS LIMITED
    • Cottrell, Ronald Alec
    • G06K13/04B07C03/06H02P07/00
    • B07C3/065B07C5/362
    • Apparatus for sorting articles and comprising a deflector movable between first and second positions to ensure that an arriving article will follow one of two paths, also includes a stepping motor (20), the shaft of which is coupled to the deflector (21), and means (17, 18) limiting the angular movement of the stepping motor shaft to an angular interval between first (12) and second (13) angular positions corresponding to the first and second positions of the deflector. The angular interval between the first and second angular positions of the stepping motor shaft is less than and lies within the angular interval defined by a shaft position (10) of stable equilibrium in the first direction of energisation of the stepping motor windings and an adjacent shaft position (11) of stable equilibrium in the second direction of energisation of the stepping motor windings. In the preferred arrangement, the motor has two windings connected in parallel between the mid-points of two transistors each of which comprises two series-connected transistors (22, 23 and 24, 25) the gates of which are energised to cause current flow through the windings in one direction for a first direction of movement of the deflector and in the other direction for the opposite direction of deflector movement.