Classifying – separating – and assorting solids – Sorting special items – and certain methods and apparatus for... – Separating means
Patent
1986-07-23
1989-06-06
Marbert, James B.
Classifying, separating, and assorting solids
Sorting special items, and certain methods and apparatus for...
Separating means
318696, B07C 536, H02P 800
Patent
active
048363871
ABSTRACT:
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, a stepping motor (20), the shaft of which is coupled to the deflector (21), and end stops (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 energization of the stepping motor windings and an adjacent shaft position (11) of stable equilibrium in the second direction of energization 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 energized 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.
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Theory and Application of Step Motors, Benjamin C. Kuo, West Publishing Co., 1974; Chapter 10, Permanent Magnet Step Motors, T. E. Beling, Sigma Instruments, Inc., Braintree, Mass.
De La Rue Systems Limited
Marbert James B.
Wacyra Edward M.
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